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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 2 | daniel-mar | 1 | unit DragDropFormats; |
| 2 | |||
| 3 | // ----------------------------------------------------------------------------- |
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| 4 | // Project: Drag and Drop Component Suite. |
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| 5 | // Module: DragDropFormats |
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| 6 | // Description: Implements commonly used clipboard formats and base classes. |
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| 7 | // Version: 4.0 |
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| 8 | // Date: 18-MAY-2001 |
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| 9 | // Target: Win32, Delphi 5-6 |
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| 10 | // Authors: Anders Melander, anders@melander.dk, http://www.melander.dk |
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| 11 | // Copyright © 1997-2001 Angus Johnson & Anders Melander |
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| 12 | // ----------------------------------------------------------------------------- |
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| 13 | |||
| 14 | interface |
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| 15 | |||
| 16 | uses |
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| 17 | DragDrop, |
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| 18 | Windows, |
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| 19 | Classes, |
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| 20 | ActiveX, |
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| 21 | ShlObj; |
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| 22 | |||
| 23 | {$include DragDrop.inc} |
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| 24 | |||
| 25 | type |
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| 26 | //////////////////////////////////////////////////////////////////////////////// |
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| 27 | // |
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| 28 | // TStreamList |
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| 29 | // |
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| 30 | //////////////////////////////////////////////////////////////////////////////// |
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| 31 | // Utility class used by TFileContentsStreamClipboardFormat and |
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| 32 | // TDataStreamDataFormat. |
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| 33 | //////////////////////////////////////////////////////////////////////////////// |
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| 34 | TStreamList = class(TObject) |
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| 35 | private |
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| 36 | FStreams : TStrings; |
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| 37 | FOnChanging : TNotifyEvent; |
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| 38 | protected |
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| 39 | function GetStream(Index: integer): TStream; |
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| 40 | function GetCount: integer; |
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| 41 | procedure Changing; |
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| 42 | public |
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| 43 | constructor Create; |
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| 44 | destructor Destroy; override; |
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| 45 | function Add(Stream: TStream): integer; |
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| 46 | function AddNamed(Stream: TStream; Name: string): integer; |
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| 47 | procedure Delete(Index: integer); |
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| 48 | procedure Clear; |
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| 49 | procedure Assign(Value: TStreamList); |
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| 50 | property Count: integer read GetCount; |
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| 51 | property Streams[Index: integer]: TStream read GetStream; default; |
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| 52 | property Names: TStrings read FStreams; |
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| 53 | property OnChanging: TNotifyEvent read FOnChanging write FOnChanging; |
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| 54 | end; |
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| 55 | |||
| 56 | |||
| 57 | //////////////////////////////////////////////////////////////////////////////// |
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| 58 | // |
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| 59 | // TInterfaceList |
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| 60 | // |
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| 61 | //////////////////////////////////////////////////////////////////////////////// |
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| 62 | // List of named interfaces. |
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| 63 | // Note: Delphi 5 also implements a TInterfaceList, but it can not be used |
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| 64 | // because it doesn't support change notification and isn't extensible. |
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| 65 | //////////////////////////////////////////////////////////////////////////////// |
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| 66 | // Utility class used by TFileContentsStorageClipboardFormat. |
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| 67 | //////////////////////////////////////////////////////////////////////////////// |
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| 68 | TInterfaceList = class(TObject) |
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| 69 | private |
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| 70 | FList : TStrings; |
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| 71 | FOnChanging : TNotifyEvent; |
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| 72 | protected |
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| 73 | function GetCount: integer; |
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| 74 | function GetName(Index: integer): string; |
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| 75 | function GetItem(Index: integer): IUnknown; |
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| 76 | procedure Changing; |
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| 77 | public |
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| 78 | constructor Create; |
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| 79 | destructor Destroy; override; |
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| 80 | function Add(Item: IUnknown): integer; |
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| 81 | function AddNamed(Item: IUnknown; Name: string): integer; |
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| 82 | procedure Delete(Index: integer); |
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| 83 | procedure Clear; |
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| 84 | procedure Assign(Value: TInterfaceList); |
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| 85 | property Items[Index: integer]: IUnknown read GetItem; default; |
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| 86 | property Names[Index: integer]: string read GetName; |
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| 87 | property Count: integer read GetCount; |
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| 88 | property OnChanging: TNotifyEvent read FOnChanging write FOnChanging; |
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| 89 | end; |
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| 90 | |||
| 91 | //////////////////////////////////////////////////////////////////////////////// |
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| 92 | // |
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| 93 | // TStorageInterfaceList |
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| 94 | // |
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| 95 | //////////////////////////////////////////////////////////////////////////////// |
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| 96 | // List of IStorage interfaces. |
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| 97 | // Used by TFileContentsStorageClipboardFormat. |
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| 98 | //////////////////////////////////////////////////////////////////////////////// |
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| 99 | TStorageInterfaceList = class(TInterfaceList) |
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| 100 | private |
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| 101 | protected |
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| 102 | function GetStorage(Index: integer): IStorage; |
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| 103 | public |
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| 104 | property Storages[Index: integer]: IStorage read GetStorage; default; |
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| 105 | end; |
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| 106 | |||
| 107 | //////////////////////////////////////////////////////////////////////////////// |
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| 108 | // |
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| 109 | // TFixedStreamAdapter |
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| 110 | // |
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| 111 | //////////////////////////////////////////////////////////////////////////////// |
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| 112 | // TFixedStreamAdapter fixes several serious bugs in TStreamAdapter.CopyTo. |
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| 113 | //////////////////////////////////////////////////////////////////////////////// |
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| 114 | TFixedStreamAdapter = class(TStreamAdapter, IStream) |
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| 115 | public |
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| 116 | function CopyTo(stm: IStream; cb: Largeint; out cbRead: Largeint; |
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| 117 | out cbWritten: Largeint): HResult; override; stdcall; |
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| 118 | end; |
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| 119 | |||
| 120 | //////////////////////////////////////////////////////////////////////////////// |
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| 121 | // |
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| 122 | // TMemoryList |
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| 123 | // |
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| 124 | //////////////////////////////////////////////////////////////////////////////// |
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| 125 | // List which owns the memory blocks it points to. |
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| 126 | //////////////////////////////////////////////////////////////////////////////// |
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| 127 | TMemoryList = class(TObject) |
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| 128 | private |
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| 129 | FList: TList; |
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| 130 | protected |
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| 131 | function Get(Index: Integer): Pointer; |
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| 132 | function GetCount: Integer; |
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| 133 | public |
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| 134 | constructor Create; |
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| 135 | destructor Destroy; override; |
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| 136 | function Add(Item: Pointer): Integer; |
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| 137 | procedure Clear; |
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| 138 | procedure Delete(Index: Integer); |
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| 139 | property Count: Integer read GetCount; |
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| 140 | property Items[Index: Integer]: Pointer read Get; default; |
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| 141 | end; |
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| 142 | |||
| 143 | //////////////////////////////////////////////////////////////////////////////// |
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| 144 | // |
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| 145 | // TCustomSimpleClipboardFormat |
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| 146 | // |
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| 147 | //////////////////////////////////////////////////////////////////////////////// |
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| 148 | // Abstract base class for simple clipboard formats stored in global memory |
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| 149 | // or a stream. |
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| 150 | //////////////////////////////////////////////////////////////////////////////// |
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| 151 | // |
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| 152 | // Two different methods of data transfer from the medium to the object are |
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| 153 | // supported: |
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| 154 | // |
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| 155 | // 1) Descendant class reads data from a buffer provided by the base class. |
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| 156 | // |
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| 157 | // 2) Base class reads data from a buffer provided by the descendant class. |
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| 158 | // |
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| 159 | // Method #1 only requires that the descedant class implements the ReadData. |
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| 160 | // |
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| 161 | // Method #2 requires that the descedant class overrides the default |
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| 162 | // DoGetDataSized method. The descedant DoGetDataSized method should allocate a |
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| 163 | // buffer of the specified size and then call the ReadDataInto method to |
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| 164 | // transfer data to the buffer. Even though the ReadData method will not be used |
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| 165 | // in this scenario, it should be implemented as an empty method (to avoid |
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| 166 | // abstract warnings). |
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| 167 | // |
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| 168 | // The WriteData method must be implemented regardless of which of the two |
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| 169 | // approaches the class implements. |
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| 170 | // |
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| 171 | //////////////////////////////////////////////////////////////////////////////// |
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| 172 | TCustomSimpleClipboardFormat = class(TClipboardFormat) |
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| 173 | private |
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| 174 | protected |
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| 175 | function DoGetData(ADataObject: IDataObject; const AMedium: TStgMedium): boolean; override; |
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| 176 | //: Transfer data from medium to a buffer of the specified size. |
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| 177 | function DoGetDataSized(ADataObject: IDataObject; const AMedium: TStgMedium; |
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| 178 | Size: integer): boolean; virtual; |
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| 179 | //: Transfer data from the specified buffer to the objects storage. |
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| 180 | function ReadData(Value: pointer; Size: integer): boolean; virtual; abstract; |
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| 181 | //: Transfer data from the medium to the specified buffer. |
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| 182 | function ReadDataInto(ADataObject: IDataObject; const AMedium: TStgMedium; |
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| 183 | Buffer: pointer; Size: integer): boolean; virtual; |
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| 184 | |||
| 185 | function DoSetData(const FormatEtcIn: TFormatEtc; |
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| 186 | var AMedium: TStgMedium): boolean; override; |
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| 187 | //: Transfer data from the objects storage to the specified buffer. |
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| 188 | function WriteData(Value: pointer; Size: integer): boolean; virtual; abstract; |
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| 189 | function GetSize: integer; virtual; abstract; |
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| 190 | public |
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| 191 | constructor Create; override; |
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| 192 | end; |
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| 193 | |||
| 194 | |||
| 195 | //////////////////////////////////////////////////////////////////////////////// |
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| 196 | // |
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| 197 | // TCustomStringClipboardFormat |
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| 198 | // |
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| 199 | //////////////////////////////////////////////////////////////////////////////// |
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| 200 | // Abstract base class for simple clipboard formats. |
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| 201 | // The data is stored in a string. |
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| 202 | //////////////////////////////////////////////////////////////////////////////// |
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| 203 | TCustomStringClipboardFormat = class(TCustomSimpleClipboardFormat) |
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| 204 | private |
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| 205 | FData: string; |
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| 206 | FTrimZeroes: boolean; |
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| 207 | protected |
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| 208 | function ReadData(Value: pointer; Size: integer): boolean; override; |
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| 209 | function WriteData(Value: pointer; Size: integer): boolean; override; |
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| 210 | function GetSize: integer; override; |
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| 211 | |||
| 212 | function GetString: string; |
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| 213 | procedure SetString(const Value: string); |
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| 214 | property Data: string read FData write FData; // DONE : Why is SetString used instead of FData? |
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| 215 | public |
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| 216 | procedure Clear; override; |
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| 217 | function HasData: boolean; override; |
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| 218 | property TrimZeroes: boolean read FTrimZeroes write FTrimZeroes; |
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| 219 | end; |
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| 220 | |||
| 221 | //////////////////////////////////////////////////////////////////////////////// |
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| 222 | // |
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| 223 | // TCustomStringListClipboardFormat |
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| 224 | // |
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| 225 | //////////////////////////////////////////////////////////////////////////////// |
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| 226 | // Abstract base class for simple cr/lf delimited string clipboard formats. |
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| 227 | // The data is stored in a TStringList. |
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| 228 | //////////////////////////////////////////////////////////////////////////////// |
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| 229 | TCustomStringListClipboardFormat = class(TCustomSimpleClipboardFormat) |
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| 230 | private |
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| 231 | FLines : TStrings; |
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| 232 | protected |
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| 233 | function ReadData(Value: pointer; Size: integer): boolean; override; |
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| 234 | function WriteData(Value: pointer; Size: integer): boolean; override; |
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| 235 | function GetSize: integer; override; |
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| 236 | |||
| 237 | function GetLines: TStrings; |
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| 238 | property Lines: TStrings read FLines; |
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| 239 | public |
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| 240 | constructor Create; override; |
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| 241 | destructor Destroy; override; |
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| 242 | procedure Clear; override; |
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| 243 | function HasData: boolean; override; |
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| 244 | end; |
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| 245 | |||
| 246 | //////////////////////////////////////////////////////////////////////////////// |
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| 247 | // |
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| 248 | // TCustomTextClipboardFormat |
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| 249 | // |
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| 250 | //////////////////////////////////////////////////////////////////////////////// |
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| 251 | // Abstract base class for simple text based clipboard formats. |
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| 252 | //////////////////////////////////////////////////////////////////////////////// |
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| 253 | TCustomTextClipboardFormat = class(TCustomStringClipboardFormat) |
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| 254 | private |
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| 255 | protected |
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| 256 | function GetSize: integer; override; |
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| 257 | property Text: string read GetString write SetString; |
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| 258 | public |
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| 259 | constructor Create; override; |
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| 260 | end; |
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| 261 | |||
| 262 | //////////////////////////////////////////////////////////////////////////////// |
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| 263 | // |
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| 264 | // TCustomWideTextClipboardFormat |
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| 265 | // |
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| 266 | //////////////////////////////////////////////////////////////////////////////// |
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| 267 | // Abstract base class for simple wide string clipboard formats storing the data |
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| 268 | // in a wide string. |
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| 269 | //////////////////////////////////////////////////////////////////////////////// |
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| 270 | TCustomWideTextClipboardFormat = class(TCustomSimpleClipboardFormat) |
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| 271 | private |
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| 272 | FText : WideString; |
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| 273 | protected |
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| 274 | function ReadData(Value: pointer; Size: integer): boolean; override; |
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| 275 | function WriteData(Value: pointer; Size: integer): boolean; override; |
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| 276 | function GetSize: integer; override; |
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| 277 | |||
| 278 | function GetText: WideString; |
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| 279 | procedure SetText(const Value: WideString); |
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| 280 | property Text: WideString read FText write FText; |
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| 281 | public |
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| 282 | procedure Clear; override; |
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| 283 | function HasData: boolean; override; |
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| 284 | end; |
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| 285 | |||
| 286 | //////////////////////////////////////////////////////////////////////////////// |
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| 287 | // |
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| 288 | // TTextClipboardFormat |
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| 289 | // |
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| 290 | //////////////////////////////////////////////////////////////////////////////// |
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| 291 | TTextClipboardFormat = class(TCustomTextClipboardFormat) |
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| 292 | public |
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| 293 | function GetClipboardFormat: TClipFormat; override; |
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| 294 | property Text; |
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| 295 | end; |
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| 296 | |||
| 297 | //////////////////////////////////////////////////////////////////////////////// |
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| 298 | // |
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| 299 | // TCustomDWORDClipboardFormat |
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| 300 | // |
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| 301 | //////////////////////////////////////////////////////////////////////////////// |
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| 302 | TCustomDWORDClipboardFormat = class(TCustomSimpleClipboardFormat) |
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| 303 | private |
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| 304 | FValue : DWORD; |
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| 305 | protected |
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| 306 | function ReadData(Value: pointer; Size: integer): boolean; override; |
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| 307 | function WriteData(Value: pointer; Size: integer): boolean; override; |
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| 308 | function GetSize: integer; override; |
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| 309 | |||
| 310 | function GetValueDWORD: DWORD; |
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| 311 | procedure SetValueDWORD(Value: DWORD); |
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| 312 | function GetValueInteger: integer; |
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| 313 | procedure SetValueInteger(Value: integer); |
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| 314 | function GetValueLongInt: longInt; |
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| 315 | procedure SetValueLongInt(Value: longInt); |
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| 316 | function GetValueBoolean: boolean; |
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| 317 | procedure SetValueBoolean(Value: boolean); |
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| 318 | public |
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| 319 | procedure Clear; override; |
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| 320 | end; |
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| 321 | |||
| 322 | //////////////////////////////////////////////////////////////////////////////// |
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| 323 | // |
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| 324 | // TFileGroupDescritorClipboardFormat |
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| 325 | // |
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| 326 | //////////////////////////////////////////////////////////////////////////////// |
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| 327 | TFileGroupDescritorClipboardFormat = class(TCustomSimpleClipboardFormat) |
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| 328 | private |
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| 329 | FFileGroupDescriptor : PFileGroupDescriptor; |
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| 330 | protected |
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| 331 | function ReadData(Value: pointer; Size: integer): boolean; override; |
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| 332 | function WriteData(Value: pointer; Size: integer): boolean; override; |
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| 333 | function GetSize: integer; override; |
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| 334 | public |
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| 335 | function GetClipboardFormat: TClipFormat; override; |
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| 336 | destructor Destroy; override; |
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| 337 | procedure Clear; override; |
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| 338 | function HasData: boolean; override; |
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| 339 | property FileGroupDescriptor: PFileGroupDescriptor read FFileGroupDescriptor; |
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| 340 | procedure CopyFrom(AFileGroupDescriptor: PFileGroupDescriptor); |
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| 341 | end; |
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| 342 | |||
| 343 | //////////////////////////////////////////////////////////////////////////////// |
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| 344 | // |
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| 345 | // TFileGroupDescritorWClipboardFormat |
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| 346 | // |
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| 347 | //////////////////////////////////////////////////////////////////////////////// |
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| 348 | // Warning: TFileGroupDescriptorW has wrong declaration in ShlObj.pas! |
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| 349 | TFileGroupDescriptorW = record |
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| 350 | cItems: UINT; |
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| 351 | fgd: array[0..0] of TFileDescriptorW; |
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| 352 | end; |
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| 353 | |||
| 354 | PFileGroupDescriptorW = ^TFileGroupDescriptorW; |
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| 355 | |||
| 356 | TFileGroupDescritorWClipboardFormat = class(TCustomSimpleClipboardFormat) |
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| 357 | private |
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| 358 | FFileGroupDescriptor : PFileGroupDescriptorW; |
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| 359 | protected |
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| 360 | function ReadData(Value: pointer; Size: integer): boolean; override; |
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| 361 | function WriteData(Value: pointer; Size: integer): boolean; override; |
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| 362 | function GetSize: integer; override; |
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| 363 | public |
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| 364 | function GetClipboardFormat: TClipFormat; override; |
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| 365 | destructor Destroy; override; |
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| 366 | procedure Clear; override; |
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| 367 | function HasData: boolean; override; |
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| 368 | property FileGroupDescriptor: PFileGroupDescriptorW read FFileGroupDescriptor; |
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| 369 | procedure CopyFrom(AFileGroupDescriptor: PFileGroupDescriptorW); |
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| 370 | end; |
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| 371 | |||
| 372 | //////////////////////////////////////////////////////////////////////////////// |
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| 373 | // |
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| 374 | // TFileContentsClipboardFormat |
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| 375 | // |
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| 376 | //////////////////////////////////////////////////////////////////////////////// |
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| 377 | // Note: File contents must be zero terminated, so we descend from |
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| 378 | // TCustomTextClipboardFormat instead of TCustomStringClipboardFormat. |
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| 379 | //////////////////////////////////////////////////////////////////////////////// |
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| 380 | TFileContentsClipboardFormat = class(TCustomTextClipboardFormat) |
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| 381 | public |
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| 382 | function GetClipboardFormat: TClipFormat; override; |
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| 383 | constructor Create; override; |
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| 384 | property Data; |
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| 385 | end; |
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| 386 | |||
| 387 | //////////////////////////////////////////////////////////////////////////////// |
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| 388 | // |
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| 389 | // TFileContentsStreamClipboardFormat |
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| 390 | // |
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| 391 | //////////////////////////////////////////////////////////////////////////////// |
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| 392 | TFileContentsStreamClipboardFormat = class(TClipboardFormat) |
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| 393 | private |
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| 394 | FStreams: TStreamList; |
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| 395 | protected |
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| 396 | public |
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| 397 | constructor Create; override; |
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| 398 | destructor Destroy; override; |
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| 399 | function GetClipboardFormat: TClipFormat; override; |
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| 400 | function GetData(DataObject: IDataObject): boolean; override; |
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| 401 | procedure Clear; override; |
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| 402 | function HasData: boolean; override; |
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| 403 | function AssignTo(Dest: TCustomDataFormat): boolean; override; |
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| 404 | property Streams: TStreamList read FStreams; |
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| 405 | end; |
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| 406 | |||
| 407 | //////////////////////////////////////////////////////////////////////////////// |
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| 408 | // |
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| 409 | // TFileContentsStreamOnDemandClipboardFormat |
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| 410 | // |
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| 411 | //////////////////////////////////////////////////////////////////////////////// |
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| 412 | // Yeah, it's a long name, but I like my names descriptive. |
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| 413 | //////////////////////////////////////////////////////////////////////////////// |
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| 414 | TVirtualFileStreamDataFormat = class; |
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| 415 | TFileContentsStreamOnDemandClipboardFormat = class; |
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| 416 | |||
| 417 | TOnGetStreamEvent = procedure(Sender: TFileContentsStreamOnDemandClipboardFormat; |
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| 418 | Index: integer; out AStream: IStream) of object; |
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| 419 | |||
| 420 | TFileContentsStreamOnDemandClipboardFormat = class(TClipboardFormat) |
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| 421 | private |
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| 422 | FOnGetStream: TOnGetStreamEvent; |
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| 423 | FGotData: boolean; |
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| 424 | FDataRequested: boolean; |
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| 425 | protected |
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| 426 | function DoSetData(const FormatEtcIn: TFormatEtc; |
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| 427 | var AMedium: TStgMedium): boolean; override; |
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| 428 | public |
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| 429 | constructor Create; override; |
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| 430 | destructor Destroy; override; |
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| 431 | function GetClipboardFormat: TClipFormat; override; |
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| 432 | function GetData(DataObject: IDataObject): boolean; override; |
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| 433 | procedure Clear; override; |
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| 434 | function HasData: boolean; override; |
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| 435 | function AssignTo(Dest: TCustomDataFormat): boolean; override; |
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| 436 | function Assign(Source: TCustomDataFormat): boolean; override; |
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| 437 | |||
| 438 | function GetStream(Index: integer): IStream; |
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| 439 | |||
| 440 | property OnGetStream: TOnGetStreamEvent read FOnGetStream write FOnGetStream; |
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| 441 | end; |
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| 442 | |||
| 443 | //////////////////////////////////////////////////////////////////////////////// |
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| 444 | // |
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| 445 | // TFileContentsStorageClipboardFormat |
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| 446 | // |
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| 447 | //////////////////////////////////////////////////////////////////////////////// |
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| 448 | TFileContentsStorageClipboardFormat = class(TClipboardFormat) |
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| 449 | private |
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| 450 | FStorages : TStorageInterfaceList; |
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| 451 | protected |
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| 452 | public |
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| 453 | constructor Create; override; |
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| 454 | destructor Destroy; override; |
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| 455 | function GetClipboardFormat: TClipFormat; override; |
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| 456 | function GetData(DataObject: IDataObject): boolean; override; |
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| 457 | procedure Clear; override; |
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| 458 | function HasData: boolean; override; |
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| 459 | function AssignTo(Dest: TCustomDataFormat): boolean; override; |
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| 460 | property Storages: TStorageInterfaceList read FStorages; |
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| 461 | end; |
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| 462 | |||
| 463 | //////////////////////////////////////////////////////////////////////////////// |
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| 464 | // |
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| 465 | // TPreferredDropEffectClipboardFormat |
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| 466 | // |
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| 467 | //////////////////////////////////////////////////////////////////////////////// |
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| 468 | TPreferredDropEffectClipboardFormat = class(TCustomDWORDClipboardFormat) |
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| 469 | public |
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| 470 | class function GetClassClipboardFormat: TClipFormat; |
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| 471 | function GetClipboardFormat: TClipFormat; override; |
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| 472 | function HasData: boolean; override; |
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| 473 | property Value: longInt read GetValueLongInt write SetValueLongInt; |
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| 474 | end; |
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| 475 | |||
| 476 | //////////////////////////////////////////////////////////////////////////////// |
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| 477 | // |
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| 478 | // TPerformedDropEffectClipboardFormat |
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| 479 | // |
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| 480 | //////////////////////////////////////////////////////////////////////////////// |
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| 481 | TPerformedDropEffectClipboardFormat = class(TCustomDWORDClipboardFormat) |
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| 482 | public |
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| 483 | function GetClipboardFormat: TClipFormat; override; |
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| 484 | property Value: longInt read GetValueLongInt write SetValueLongInt; |
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| 485 | end; |
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| 486 | |||
| 487 | //////////////////////////////////////////////////////////////////////////////// |
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| 488 | // |
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| 489 | // TLogicalPerformedDropEffectClipboardFormat |
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| 490 | // |
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| 491 | //////////////////////////////////////////////////////////////////////////////// |
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| 492 | // Microsoft's latest (so far) "logical" solution to the never ending attempts |
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| 493 | // of reporting back to the source which operation actually took place. Sigh! |
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| 494 | //////////////////////////////////////////////////////////////////////////////// |
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| 495 | TLogicalPerformedDropEffectClipboardFormat = class(TCustomDWORDClipboardFormat) |
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| 496 | public |
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| 497 | function GetClipboardFormat: TClipFormat; override; |
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| 498 | property Value: longInt read GetValueLongInt write SetValueLongInt; |
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| 499 | end; |
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| 500 | |||
| 501 | //////////////////////////////////////////////////////////////////////////////// |
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| 502 | // |
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| 503 | // TPasteSuccededClipboardFormat |
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| 504 | // |
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| 505 | //////////////////////////////////////////////////////////////////////////////// |
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| 506 | TPasteSuccededClipboardFormat = class(TCustomDWORDClipboardFormat) |
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| 507 | public |
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| 508 | function GetClipboardFormat: TClipFormat; override; |
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| 509 | property Value: longInt read GetValueLongInt write SetValueLongInt; |
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| 510 | end; |
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| 511 | |||
| 512 | //////////////////////////////////////////////////////////////////////////////// |
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| 513 | // |
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| 514 | // TInDragLoopClipboardFormat |
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| 515 | // |
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| 516 | //////////////////////////////////////////////////////////////////////////////// |
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| 517 | TInShellDragLoopClipboardFormat = class(TCustomDWORDClipboardFormat) |
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| 518 | public |
||
| 519 | function GetClipboardFormat: TClipFormat; override; |
||
| 520 | property InShellDragLoop: boolean read GetValueBoolean write SetValueBoolean; |
||
| 521 | end; |
||
| 522 | |||
| 523 | //////////////////////////////////////////////////////////////////////////////// |
||
| 524 | // |
||
| 525 | // TTargetCLSIDClipboardFormat |
||
| 526 | // |
||
| 527 | //////////////////////////////////////////////////////////////////////////////// |
||
| 528 | TTargetCLSIDClipboardFormat = class(TCustomSimpleClipboardFormat) |
||
| 529 | private |
||
| 530 | FCLSID: TCLSID; |
||
| 531 | protected |
||
| 532 | function ReadData(Value: pointer; Size: integer): boolean; override; |
||
| 533 | function WriteData(Value: pointer; Size: integer): boolean; override; |
||
| 534 | function GetSize: integer; override; |
||
| 535 | public |
||
| 536 | function GetClipboardFormat: TClipFormat; override; |
||
| 537 | procedure Clear; override; |
||
| 538 | function HasData: boolean; override; |
||
| 539 | property CLSID: TCLSID read FCLSID write FCLSID; |
||
| 540 | end; |
||
| 541 | |||
| 542 | //////////////////////////////////////////////////////////////////////////////// |
||
| 543 | //////////////////////////////////////////////////////////////////////////////// |
||
| 544 | //////////////////////////////////////////////////////////////////////////////// |
||
| 545 | |||
| 546 | |||
| 547 | //////////////////////////////////////////////////////////////////////////////// |
||
| 548 | // |
||
| 549 | // TTextDataFormat |
||
| 550 | // |
||
| 551 | //////////////////////////////////////////////////////////////////////////////// |
||
| 552 | TTextDataFormat = class(TCustomDataFormat) |
||
| 553 | private |
||
| 554 | FText : string; |
||
| 555 | protected |
||
| 556 | procedure SetText(const Value: string); |
||
| 557 | public |
||
| 558 | function Assign(Source: TClipboardFormat): boolean; override; |
||
| 559 | function AssignTo(Dest: TClipboardFormat): boolean; override; |
||
| 560 | procedure Clear; override; |
||
| 561 | function HasData: boolean; override; |
||
| 562 | function NeedsData: boolean; override; |
||
| 563 | property Text: string read FText write SetText; |
||
| 564 | end; |
||
| 565 | |||
| 566 | //////////////////////////////////////////////////////////////////////////////// |
||
| 567 | // |
||
| 568 | // TDataStreamDataFormat |
||
| 569 | // |
||
| 570 | //////////////////////////////////////////////////////////////////////////////// |
||
| 571 | TDataStreamDataFormat = class(TCustomDataFormat) |
||
| 572 | private |
||
| 573 | FStreams : TStreamList; |
||
| 574 | public |
||
| 575 | constructor Create(AOwner: TDragDropComponent); override; |
||
| 576 | destructor Destroy; override; |
||
| 577 | procedure Clear; override; |
||
| 578 | function HasData: boolean; override; |
||
| 579 | function NeedsData: boolean; override; |
||
| 580 | property Streams: TStreamList read FStreams; |
||
| 581 | end; |
||
| 582 | |||
| 583 | //////////////////////////////////////////////////////////////////////////////// |
||
| 584 | // |
||
| 585 | // TVirtualFileStreamDataFormat |
||
| 586 | // |
||
| 587 | //////////////////////////////////////////////////////////////////////////////// |
||
| 588 | TVirtualFileStreamDataFormat = class(TCustomDataFormat) |
||
| 589 | private |
||
| 590 | FFileDescriptors: TMemoryList; |
||
| 591 | FFileNames: TStrings; |
||
| 592 | FFileContentsClipboardFormat: TFileContentsStreamOnDemandClipboardFormat; |
||
| 593 | FFileGroupDescritorClipboardFormat: TFileGroupDescritorClipboardFormat; |
||
| 594 | FHasContents: boolean; |
||
| 595 | protected |
||
| 596 | procedure SetFileNames(const Value: TStrings); |
||
| 597 | function GetOnGetStream: TOnGetStreamEvent; |
||
| 598 | procedure SetOnGetStream(const Value: TOnGetStreamEvent); |
||
| 599 | public |
||
| 600 | constructor Create(AOwner: TDragDropComponent); override; |
||
| 601 | destructor Destroy; override; |
||
| 602 | |||
| 603 | function Assign(Source: TClipboardFormat): boolean; override; |
||
| 604 | function AssignTo(Dest: TClipboardFormat): boolean; override; |
||
| 605 | procedure Clear; override; |
||
| 606 | function HasData: boolean; override; |
||
| 607 | function NeedsData: boolean; override; |
||
| 608 | property FileDescriptors: TMemoryList read FFileDescriptors; |
||
| 609 | property FileNames: TStrings read FFileNames write SetFileNames; |
||
| 610 | property FileContentsClipboardFormat: TFileContentsStreamOnDemandClipboardFormat |
||
| 611 | read FFileContentsClipboardFormat; |
||
| 612 | property FileGroupDescritorClipboardFormat: TFileGroupDescritorClipboardFormat |
||
| 613 | read FFileGroupDescritorClipboardFormat; |
||
| 614 | property OnGetStream: TOnGetStreamEvent read GetOnGetStream write SetOnGetStream; |
||
| 615 | end; |
||
| 616 | |||
| 617 | //////////////////////////////////////////////////////////////////////////////// |
||
| 618 | // |
||
| 619 | // TFeedbackDataFormat |
||
| 620 | // |
||
| 621 | //////////////////////////////////////////////////////////////////////////////// |
||
| 622 | // Data used for communication between source and target. |
||
| 623 | // Only used by the drop source. |
||
| 624 | //////////////////////////////////////////////////////////////////////////////// |
||
| 625 | TFeedbackDataFormat = class(TCustomDataFormat) |
||
| 626 | private |
||
| 627 | FPreferredDropEffect: longInt; |
||
| 628 | FPerformedDropEffect: longInt; |
||
| 629 | FLogicalPerformedDropEffect: longInt; |
||
| 630 | FPasteSucceded: longInt; |
||
| 631 | FInShellDragLoop: boolean; |
||
| 632 | FGotInShellDragLoop: boolean; |
||
| 633 | FTargetCLSID: TCLSID; |
||
| 634 | protected |
||
| 635 | procedure SetInShellDragLoop(const Value: boolean); |
||
| 636 | procedure SetPasteSucceded(const Value: longInt); |
||
| 637 | procedure SetPerformedDropEffect(const Value: longInt); |
||
| 638 | procedure SetPreferredDropEffect(const Value: longInt); |
||
| 639 | procedure SetTargetCLSID(const Value: TCLSID); |
||
| 640 | procedure SetLogicalPerformedDropEffect(const Value: Integer); |
||
| 641 | public |
||
| 642 | function Assign(Source: TClipboardFormat): boolean; override; |
||
| 643 | function AssignTo(Dest: TClipboardFormat): boolean; override; |
||
| 644 | procedure Clear; override; |
||
| 645 | function HasData: boolean; override; |
||
| 646 | function NeedsData: boolean; override; |
||
| 647 | property PreferredDropEffect: longInt read FPreferredDropEffect |
||
| 648 | write SetPreferredDropEffect; |
||
| 649 | property PerformedDropEffect: longInt read FPerformedDropEffect |
||
| 650 | write SetPerformedDropEffect; |
||
| 651 | property LogicalPerformedDropEffect: longInt read FLogicalPerformedDropEffect |
||
| 652 | write SetLogicalPerformedDropEffect; |
||
| 653 | property PasteSucceded: longInt read FPasteSucceded write SetPasteSucceded; |
||
| 654 | property InShellDragLoop: boolean read FInShellDragLoop |
||
| 655 | write SetInShellDragLoop; |
||
| 656 | property TargetCLSID: TCLSID read FTargetCLSID write SetTargetCLSID; |
||
| 657 | end; |
||
| 658 | |||
| 659 | |||
| 660 | //////////////////////////////////////////////////////////////////////////////// |
||
| 661 | // |
||
| 662 | // TGenericClipboardFormat & TGenericDataFormat |
||
| 663 | // |
||
| 664 | //////////////////////////////////////////////////////////////////////////////// |
||
| 665 | // TGenericDataFormat is not used internally by the library, but can be used to |
||
| 666 | // add support for new formats with a minimum of custom code. |
||
| 667 | // Even though TGenericDataFormat represents the data as a string, it can be |
||
| 668 | // used to transfer any kind of data. |
||
| 669 | // TGenericClipboardFormat is used internally by TGenericDataFormat but can also |
||
| 670 | // be used by other TCustomDataFormat descendants or as a base class for new |
||
| 671 | // clipboard formats. |
||
| 672 | // Note that you should not register TGenericClipboardFormat as compatible with |
||
| 673 | // TGenericDataFormat. |
||
| 674 | // To use TGenericDataFormat, all you need to do is instantiate it against |
||
| 675 | // the desired component and register your custom clipboard formats: |
||
| 676 | // |
||
| 677 | // var |
||
| 678 | // MyCustomData: TGenericDataFormat; |
||
| 679 | // |
||
| 680 | // MyCustomData := TGenericDataFormat.Create(DropTextTarget1); |
||
| 681 | // MyCustomData.AddFormat('MyCustomFormat'); |
||
| 682 | // |
||
| 683 | //////////////////////////////////////////////////////////////////////////////// |
||
| 684 | TGenericDataFormat = class(TCustomDataFormat) |
||
| 685 | private |
||
| 686 | FData : string; |
||
| 687 | protected |
||
| 688 | function GetSize: integer; |
||
| 689 | procedure DoSetData(const Value: string); |
||
| 690 | public |
||
| 691 | procedure Clear; override; |
||
| 692 | function HasData: boolean; override; |
||
| 693 | function NeedsData: boolean; override; |
||
| 694 | procedure AddFormat(const AFormat: string); |
||
| 695 | procedure SetDataHere(const AData; ASize: integer); |
||
| 696 | function GetDataHere(var AData; ASize: integer): integer; |
||
| 697 | property Data: string read FData write DoSetData; |
||
| 698 | property Size: integer read GetSize; |
||
| 699 | end; |
||
| 700 | |||
| 701 | TGenericClipboardFormat = class(TCustomStringClipboardFormat) |
||
| 702 | private |
||
| 703 | FFormat: string; |
||
| 704 | protected |
||
| 705 | procedure SetClipboardFormatName(const Value: string); override; |
||
| 706 | function GetClipboardFormatName: string; override; |
||
| 707 | function GetClipboardFormat: TClipFormat; override; |
||
| 708 | public |
||
| 709 | function Assign(Source: TCustomDataFormat): boolean; override; |
||
| 710 | function AssignTo(Dest: TCustomDataFormat): boolean; override; |
||
| 711 | property Data; |
||
| 712 | end; |
||
| 713 | |||
| 714 | |||
| 715 | |||
| 716 | //////////////////////////////////////////////////////////////////////////////// |
||
| 717 | //////////////////////////////////////////////////////////////////////////////// |
||
| 718 | // |
||
| 719 | // IMPLEMENTATION |
||
| 720 | // |
||
| 721 | //////////////////////////////////////////////////////////////////////////////// |
||
| 722 | //////////////////////////////////////////////////////////////////////////////// |
||
| 723 | implementation |
||
| 724 | |||
| 725 | uses |
||
| 726 | DropSource, |
||
| 727 | DropTarget, |
||
| 728 | SysUtils; |
||
| 729 | |||
| 730 | //////////////////////////////////////////////////////////////////////////////// |
||
| 731 | // |
||
| 732 | // TStreamList |
||
| 733 | // |
||
| 734 | //////////////////////////////////////////////////////////////////////////////// |
||
| 735 | constructor TStreamList.Create; |
||
| 736 | begin |
||
| 737 | inherited Create; |
||
| 738 | FStreams := TStringList.Create; |
||
| 739 | end; |
||
| 740 | |||
| 741 | destructor TStreamList.Destroy; |
||
| 742 | begin |
||
| 743 | Clear; |
||
| 744 | FStreams.Free; |
||
| 745 | inherited Destroy; |
||
| 746 | end; |
||
| 747 | |||
| 748 | procedure TStreamList.Changing; |
||
| 749 | begin |
||
| 750 | if (Assigned(OnChanging)) then |
||
| 751 | OnChanging(Self); |
||
| 752 | end; |
||
| 753 | |||
| 754 | function TStreamList.GetStream(Index: integer): TStream; |
||
| 755 | begin |
||
| 756 | Result := TStream(FStreams.Objects[Index]); |
||
| 757 | end; |
||
| 758 | |||
| 759 | function TStreamList.Add(Stream: TStream): integer; |
||
| 760 | begin |
||
| 761 | Result := AddNamed(Stream, ''); |
||
| 762 | end; |
||
| 763 | |||
| 764 | function TStreamList.AddNamed(Stream: TStream; Name: string): integer; |
||
| 765 | begin |
||
| 766 | Changing; |
||
| 767 | Result := FStreams.AddObject(Name, Stream); |
||
| 768 | end; |
||
| 769 | |||
| 770 | function TStreamList.GetCount: integer; |
||
| 771 | begin |
||
| 772 | Result := FStreams.Count; |
||
| 773 | end; |
||
| 774 | |||
| 775 | procedure TStreamList.Assign(Value: TStreamList); |
||
| 776 | begin |
||
| 777 | Clear; |
||
| 778 | FStreams.Assign(Value.Names); |
||
| 779 | // Transfer ownership of objects |
||
| 780 | Value.FStreams.Clear; |
||
| 781 | end; |
||
| 782 | |||
| 783 | procedure TStreamList.Delete(Index: integer); |
||
| 784 | begin |
||
| 785 | Changing; |
||
| 786 | FStreams.Delete(Index); |
||
| 787 | end; |
||
| 788 | |||
| 789 | procedure TStreamList.Clear; |
||
| 790 | var |
||
| 791 | i : integer; |
||
| 792 | begin |
||
| 793 | Changing; |
||
| 794 | for i := 0 to FStreams.Count-1 do |
||
| 795 | if (FStreams.Objects[i] <> nil) then |
||
| 796 | FStreams.Objects[i].Free; |
||
| 797 | FStreams.Clear; |
||
| 798 | end; |
||
| 799 | |||
| 800 | |||
| 801 | //////////////////////////////////////////////////////////////////////////////// |
||
| 802 | // |
||
| 803 | // TInterfaceList |
||
| 804 | // |
||
| 805 | //////////////////////////////////////////////////////////////////////////////// |
||
| 806 | constructor TInterfaceList.Create; |
||
| 807 | begin |
||
| 808 | inherited Create; |
||
| 809 | FList := TStringList.Create; |
||
| 810 | end; |
||
| 811 | |||
| 812 | destructor TInterfaceList.Destroy; |
||
| 813 | begin |
||
| 814 | Clear; |
||
| 815 | FList.Free; |
||
| 816 | inherited Destroy; |
||
| 817 | end; |
||
| 818 | |||
| 819 | function TInterfaceList.Add(Item: IUnknown): integer; |
||
| 820 | begin |
||
| 821 | Result := AddNamed(Item, ''); |
||
| 822 | end; |
||
| 823 | |||
| 824 | function TInterfaceList.AddNamed(Item: IUnknown; Name: string): integer; |
||
| 825 | begin |
||
| 826 | Changing; |
||
| 827 | with FList do |
||
| 828 | begin |
||
| 829 | Result := AddObject(Name, nil); |
||
| 830 | Objects[Result] := TObject(Item); |
||
| 831 | Item._AddRef; |
||
| 832 | end; |
||
| 833 | end; |
||
| 834 | |||
| 835 | procedure TInterfaceList.Changing; |
||
| 836 | begin |
||
| 837 | if (Assigned(OnChanging)) then |
||
| 838 | OnChanging(Self); |
||
| 839 | end; |
||
| 840 | |||
| 841 | procedure TInterfaceList.Clear; |
||
| 842 | var |
||
| 843 | i : Integer; |
||
| 844 | p : pointer; |
||
| 845 | begin |
||
| 846 | Changing; |
||
| 847 | with FList do |
||
| 848 | begin |
||
| 849 | for i := 0 to Count - 1 do |
||
| 850 | begin |
||
| 851 | p := Objects[i]; |
||
| 852 | IUnknown(p) := nil; |
||
| 853 | end; |
||
| 854 | Clear; |
||
| 855 | end; |
||
| 856 | end; |
||
| 857 | |||
| 858 | procedure TInterfaceList.Assign(Value: TInterfaceList); |
||
| 859 | var |
||
| 860 | i : Integer; |
||
| 861 | begin |
||
| 862 | Changing; |
||
| 863 | for i := 0 to Value.Count - 1 do |
||
| 864 | AddNamed(Value.Items[i], Value.Names[i]); |
||
| 865 | end; |
||
| 866 | |||
| 867 | procedure TInterfaceList.Delete(Index: integer); |
||
| 868 | var |
||
| 869 | p : pointer; |
||
| 870 | begin |
||
| 871 | Changing; |
||
| 872 | with FList do |
||
| 873 | begin |
||
| 874 | p := Objects[Index]; |
||
| 875 | IUnknown(p) := nil; |
||
| 876 | Delete(Index); |
||
| 877 | end; |
||
| 878 | end; |
||
| 879 | |||
| 880 | function TInterfaceList.GetCount: integer; |
||
| 881 | begin |
||
| 882 | Result := FList.Count; |
||
| 883 | end; |
||
| 884 | |||
| 885 | function TInterfaceList.GetName(Index: integer): string; |
||
| 886 | begin |
||
| 887 | Result := FList[Index]; |
||
| 888 | end; |
||
| 889 | |||
| 890 | function TInterfaceList.GetItem(Index: integer): IUnknown; |
||
| 891 | var |
||
| 892 | p : pointer; |
||
| 893 | begin |
||
| 894 | p := FList.Objects[Index]; |
||
| 895 | Result := IUnknown(p); |
||
| 896 | end; |
||
| 897 | |||
| 898 | |||
| 899 | //////////////////////////////////////////////////////////////////////////////// |
||
| 900 | // |
||
| 901 | // TStorageInterfaceList |
||
| 902 | // |
||
| 903 | //////////////////////////////////////////////////////////////////////////////// |
||
| 904 | function TStorageInterfaceList.GetStorage(Index: integer): IStorage; |
||
| 905 | begin |
||
| 906 | Result := IStorage(Items[Index]); |
||
| 907 | end; |
||
| 908 | |||
| 909 | |||
| 910 | //////////////////////////////////////////////////////////////////////////////// |
||
| 911 | // |
||
| 912 | // TMemoryList |
||
| 913 | // |
||
| 914 | //////////////////////////////////////////////////////////////////////////////// |
||
| 915 | function TMemoryList.Add(Item: Pointer): Integer; |
||
| 916 | begin |
||
| 917 | Result := FList.Add(Item); |
||
| 918 | end; |
||
| 919 | |||
| 920 | procedure TMemoryList.Clear; |
||
| 921 | var |
||
| 922 | i: integer; |
||
| 923 | begin |
||
| 924 | for i := FList.Count-1 downto 0 do |
||
| 925 | Delete(i); |
||
| 926 | end; |
||
| 927 | |||
| 928 | constructor TMemoryList.Create; |
||
| 929 | begin |
||
| 930 | inherited Create; |
||
| 931 | FList := TList.Create; |
||
| 932 | end; |
||
| 933 | |||
| 934 | procedure TMemoryList.Delete(Index: Integer); |
||
| 935 | begin |
||
| 936 | Freemem(FList[Index]); |
||
| 937 | FList.Delete(Index); |
||
| 938 | end; |
||
| 939 | |||
| 940 | destructor TMemoryList.Destroy; |
||
| 941 | begin |
||
| 942 | FList.Free; |
||
| 943 | inherited Destroy; |
||
| 944 | end; |
||
| 945 | |||
| 946 | function TMemoryList.Get(Index: Integer): Pointer; |
||
| 947 | begin |
||
| 948 | Result := FList[Index]; |
||
| 949 | end; |
||
| 950 | |||
| 951 | function TMemoryList.GetCount: Integer; |
||
| 952 | begin |
||
| 953 | Result := FList.Count; |
||
| 954 | end; |
||
| 955 | |||
| 956 | |||
| 957 | //////////////////////////////////////////////////////////////////////////////// |
||
| 958 | // |
||
| 959 | // TFixedStreamAdapter |
||
| 960 | // |
||
| 961 | //////////////////////////////////////////////////////////////////////////////// |
||
| 962 | function TFixedStreamAdapter.CopyTo(stm: IStream; cb: Largeint; out cbRead: Largeint; |
||
| 963 | out cbWritten: Largeint): HResult; |
||
| 964 | const |
||
| 965 | MaxBufSize = 1024 * 1024; // 1mb |
||
| 966 | var |
||
| 967 | Buffer: Pointer; |
||
| 968 | BufSize, BurstReadSize, BurstWriteSize: Integer; |
||
| 969 | BytesRead, BytesWritten, BurstWritten: LongInt; |
||
| 970 | begin |
||
| 971 | Result := S_OK; |
||
| 972 | BytesRead := 0; |
||
| 973 | BytesWritten := 0; |
||
| 974 | try |
||
| 975 | if (cb < 0) then |
||
| 976 | begin |
||
| 977 | // Note: The folowing is a workaround for a design bug in either explorer |
||
| 978 | // or the clipboard. See comment in TCustomSimpleClipboardFormat.DoSetData |
||
| 979 | // for an explanation. |
||
| 980 | if (Stream.Position = Stream.Size) then |
||
| 981 | Stream.Position := 0; |
||
| 982 | |||
| 983 | cb := Stream.Size - Stream.Position; |
||
| 984 | end; |
||
| 985 | if cb > MaxBufSize then |
||
| 986 | BufSize := MaxBufSize |
||
| 987 | else |
||
| 988 | BufSize := Integer(cb); |
||
| 989 | GetMem(Buffer, BufSize); |
||
| 990 | try |
||
| 991 | while cb > 0 do |
||
| 992 | begin |
||
| 993 | if cb > BufSize then |
||
| 994 | BurstReadSize := BufSize |
||
| 995 | else |
||
| 996 | BurstReadSize := cb; |
||
| 997 | |||
| 998 | BurstWriteSize := Stream.Read(Buffer^, BurstReadSize); |
||
| 999 | if (BurstWriteSize = 0) then |
||
| 1000 | break; |
||
| 1001 | Inc(BytesRead, BurstWriteSize); |
||
| 1002 | BurstWritten := 0; |
||
| 1003 | Result := stm.Write(Buffer, BurstWriteSize, @BurstWritten); |
||
| 1004 | Inc(BytesWritten, BurstWritten); |
||
| 1005 | if (Result = S_OK) and (Integer(BurstWritten) <> BurstWriteSize) then |
||
| 1006 | Result := E_FAIL; |
||
| 1007 | if Result <> S_OK then |
||
| 1008 | Exit; |
||
| 1009 | Dec(cb, BurstWritten); |
||
| 1010 | end; |
||
| 1011 | finally |
||
| 1012 | FreeMem(Buffer); |
||
| 1013 | if (@cbWritten <> nil) then |
||
| 1014 | cbWritten := BytesWritten; |
||
| 1015 | if (@cbRead <> nil) then |
||
| 1016 | cbRead := BytesRead; |
||
| 1017 | end; |
||
| 1018 | except |
||
| 1019 | Result := E_UNEXPECTED; |
||
| 1020 | end; |
||
| 1021 | end; |
||
| 1022 | |||
| 1023 | |||
| 1024 | //////////////////////////////////////////////////////////////////////////////// |
||
| 1025 | // |
||
| 1026 | // TCustomSimpleClipboardFormat |
||
| 1027 | // |
||
| 1028 | //////////////////////////////////////////////////////////////////////////////// |
||
| 1029 | constructor TCustomSimpleClipboardFormat.Create; |
||
| 1030 | begin |
||
| 1031 | CreateFormat(TYMED_HGLOBAL or TYMED_ISTREAM); |
||
| 1032 | end; |
||
| 1033 | |||
| 1034 | function TCustomSimpleClipboardFormat.DoGetData(ADataObject: IDataObject; |
||
| 1035 | const AMedium: TStgMedium): boolean; |
||
| 1036 | var |
||
| 1037 | Stream : IStream; |
||
| 1038 | StatStg : TStatStg; |
||
| 1039 | Size : integer; |
||
| 1040 | begin |
||
| 1041 | // Get size from HGlobal. |
||
| 1042 | if (AMedium.tymed and TYMED_HGLOBAL <> 0) then |
||
| 1043 | begin |
||
| 1044 | Size := GlobalSize(AMedium.HGlobal); |
||
| 1045 | Result := True; |
||
| 1046 | end else |
||
| 1047 | // Get size from IStream. |
||
| 1048 | if (AMedium.tymed and TYMED_ISTREAM <> 0) then |
||
| 1049 | begin |
||
| 1050 | Stream := IStream(AMedium.stm); |
||
| 1051 | Result := (Stream <> nil) and (Stream.Stat(StatStg, STATFLAG_NONAME) = S_OK); |
||
| 1052 | Size := StatStg.cbSize; |
||
| 1053 | Stream := nil; // Not really nescessary. |
||
| 1054 | end else |
||
| 1055 | begin |
||
| 1056 | Size := 0; |
||
| 1057 | Result := False; |
||
| 1058 | end; |
||
| 1059 | |||
| 1060 | if (Result) and (Size > 0) then |
||
| 1061 | begin |
||
| 1062 | // Read the given amount of data. |
||
| 1063 | Result := DoGetDataSized(ADataObject, AMedium, Size); |
||
| 1064 | end; |
||
| 1065 | end; |
||
| 1066 | |||
| 1067 | function TCustomSimpleClipboardFormat.DoGetDataSized(ADataObject: IDataObject; |
||
| 1068 | const AMedium: TStgMedium; Size: integer): boolean; |
||
| 1069 | var |
||
| 1070 | Buffer: pointer; |
||
| 1071 | Stream: IStream; |
||
| 1072 | Remaining: longInt; |
||
| 1073 | Chunk: longInt; |
||
| 1074 | pChunk: PChar; |
||
| 1075 | begin |
||
| 1076 | if (Size > 0) then |
||
| 1077 | begin |
||
| 1078 | (* |
||
| 1079 | ** In this method we prefer TYMED_HGLOBAL over TYMED_ISTREAM and thus check |
||
| 1080 | ** for TYMED_HGLOBAL first. |
||
| 1081 | *) |
||
| 1082 | |||
| 1083 | // Read data from HGlobal |
||
| 1084 | if (AMedium.tymed and TYMED_HGLOBAL <> 0) then |
||
| 1085 | begin |
||
| 1086 | // Use global memory as buffer |
||
| 1087 | Buffer := GlobalLock(AMedium.HGlobal); |
||
| 1088 | try |
||
| 1089 | // Read data from buffer into object |
||
| 1090 | Result := (Buffer <> nil) and (ReadData(Buffer, Size)); |
||
| 1091 | finally |
||
| 1092 | GlobalUnlock(AMedium.HGlobal); |
||
| 1093 | end; |
||
| 1094 | end else |
||
| 1095 | // Read data from IStream |
||
| 1096 | if (AMedium.tymed and TYMED_ISTREAM <> 0) then |
||
| 1097 | begin |
||
| 1098 | // Allocate buffer |
||
| 1099 | GetMem(Buffer, Size); |
||
| 1100 | try |
||
| 1101 | // Read data from stream into buffer |
||
| 1102 | Stream := IStream(AMedium.stm); |
||
| 1103 | if (Stream <> nil) then |
||
| 1104 | begin |
||
| 1105 | Stream.Seek(0, STREAM_SEEK_SET, PLargeuint(nil)^); |
||
| 1106 | Result := True; |
||
| 1107 | Remaining := Size; |
||
| 1108 | pChunk := Buffer; |
||
| 1109 | while (Result) and (Remaining > 0) do |
||
| 1110 | begin |
||
| 1111 | Result := (Stream.Read(pChunk, Remaining, @Chunk) = S_OK); |
||
| 1112 | if (Chunk = 0) then |
||
| 1113 | break; |
||
| 1114 | inc(pChunk, Chunk); |
||
| 1115 | dec(Remaining, Chunk); |
||
| 1116 | end; |
||
| 1117 | Stream := nil; // Not really nescessary. |
||
| 1118 | end else |
||
| 1119 | Result := False; |
||
| 1120 | // Transfer data from buffer into object. |
||
| 1121 | Result := Result and (ReadData(Buffer, Size)); |
||
| 1122 | finally |
||
| 1123 | FreeMem(Buffer); |
||
| 1124 | end; |
||
| 1125 | end else |
||
| 1126 | Result := False; |
||
| 1127 | end else |
||
| 1128 | Result := False; |
||
| 1129 | end; |
||
| 1130 | |||
| 1131 | function TCustomSimpleClipboardFormat.ReadDataInto(ADataObject: IDataObject; |
||
| 1132 | const AMedium: TStgMedium; Buffer: pointer; Size: integer): boolean; |
||
| 1133 | var |
||
| 1134 | Stream: IStream; |
||
| 1135 | p: pointer; |
||
| 1136 | Remaining: longInt; |
||
| 1137 | Chunk: longInt; |
||
| 1138 | begin |
||
| 1139 | Result := (Buffer <> nil) and (Size > 0); |
||
| 1140 | if (Result) then |
||
| 1141 | begin |
||
| 1142 | // Read data from HGlobal |
||
| 1143 | if (AMedium.tymed and TYMED_HGLOBAL <> 0) then |
||
| 1144 | begin |
||
| 1145 | p := GlobalLock(AMedium.HGlobal); |
||
| 1146 | try |
||
| 1147 | Result := (p <> nil); |
||
| 1148 | if (Result) then |
||
| 1149 | Move(p^, Buffer^, Size); |
||
| 1150 | finally |
||
| 1151 | GlobalUnlock(AMedium.HGlobal); |
||
| 1152 | end; |
||
| 1153 | end else |
||
| 1154 | // Read data from IStream |
||
| 1155 | if (AMedium.tymed and TYMED_ISTREAM <> 0) then |
||
| 1156 | begin |
||
| 1157 | Stream := IStream(AMedium.stm); |
||
| 1158 | if (Stream <> nil) then |
||
| 1159 | begin |
||
| 1160 | Stream.Seek(0, STREAM_SEEK_SET, PLargeuint(nil)^); |
||
| 1161 | Remaining := Size; |
||
| 1162 | while (Result) and (Remaining > 0) do |
||
| 1163 | begin |
||
| 1164 | Result := (Stream.Read(Buffer, Remaining, @Chunk) = S_OK); |
||
| 1165 | if (Chunk = 0) then |
||
| 1166 | break; |
||
| 1167 | inc(PChar(Buffer), Chunk); |
||
| 1168 | dec(Remaining, Chunk); |
||
| 1169 | end; |
||
| 1170 | end else |
||
| 1171 | Result := False; |
||
| 1172 | end else |
||
| 1173 | Result := False; |
||
| 1174 | end; |
||
| 1175 | end; |
||
| 1176 | |||
| 1177 | function TCustomSimpleClipboardFormat.DoSetData(const FormatEtcIn: TFormatEtc; |
||
| 1178 | var AMedium: TStgMedium): boolean; |
||
| 1179 | var |
||
| 1180 | p: pointer; |
||
| 1181 | Size: integer; |
||
| 1182 | Stream: TMemoryStream; |
||
| 1183 | // Warning: TStreamAdapter.CopyTo is broken! |
||
| 1184 | StreamAdapter: TStreamAdapter; |
||
| 1185 | begin |
||
| 1186 | Result := False; |
||
| 1187 | |||
| 1188 | Size := GetSize; |
||
| 1189 | if (Size <= 0) then |
||
| 1190 | exit; |
||
| 1191 | |||
| 1192 | if (FormatEtcIn.tymed and TYMED_ISTREAM <> 0) then |
||
| 1193 | begin |
||
| 1194 | |||
| 1195 | Stream := TMemoryStream.Create; |
||
| 1196 | StreamAdapter := TFixedStreamAdapter.Create(Stream, soOwned); |
||
| 1197 | |||
| 1198 | try |
||
| 1199 | Stream.Size := Size; |
||
| 1200 | Result := WriteData(Stream.Memory, Size); |
||
| 1201 | // Note: Conflicting information on which of the following two are correct: |
||
| 1202 | // |
||
| 1203 | // 1) Stream.Position := Size; |
||
| 1204 | // |
||
| 1205 | // 2) Stream.Position := 0; |
||
| 1206 | // |
||
| 1207 | // #1 is required for clipboard operations to succeed; The clipboard uses |
||
| 1208 | // a Seek(0, STREAM_SEEK_CUR) to determine the size of the stream. |
||
| 1209 | // |
||
| 1210 | // #2 is required for shell operations to succeed; The shell uses a |
||
| 1211 | // Read(-1) to read all of the stream. |
||
| 1212 | // |
||
| 1213 | // This library uses a Stream.Stat to determine the size of the stream and |
||
| 1214 | // then reads from start to end of stream. |
||
| 1215 | // |
||
| 1216 | // Since we use #1 (see below), we work around #2 in |
||
| 1217 | // TFixedStreamAdapter.CopyTo. |
||
| 1218 | if (Result) then |
||
| 1219 | begin |
||
| 1220 | Stream.Position := Size; |
||
| 1221 | IStream(AMedium.stm) := StreamAdapter as IStream; |
||
| 1222 | end; |
||
| 1223 | except |
||
| 1224 | Result := False; |
||
| 1225 | end; |
||
| 1226 | |||
| 1227 | if (not Result) then |
||
| 1228 | begin |
||
| 1229 | StreamAdapter.Free; |
||
| 1230 | AMedium.stm := nil; |
||
| 1231 | end else |
||
| 1232 | AMedium.tymed := TYMED_ISTREAM; |
||
| 1233 | |||
| 1234 | end else |
||
| 1235 | if (FormatEtcIn.tymed and TYMED_HGLOBAL <> 0) then |
||
| 1236 | begin |
||
| 1237 | |||
| 1238 | AMedium.hGlobal := GlobalAlloc(GMEM_SHARE or GHND, Size); |
||
| 1239 | if (AMedium.hGlobal = 0) then |
||
| 1240 | exit; |
||
| 1241 | |||
| 1242 | try |
||
| 1243 | p := GlobalLock(AMedium.hGlobal); |
||
| 1244 | try |
||
| 1245 | Result := (p <> nil) and WriteData(p, Size); |
||
| 1246 | finally |
||
| 1247 | GlobalUnlock(AMedium.hGlobal); |
||
| 1248 | end; |
||
| 1249 | except |
||
| 1250 | Result := False; |
||
| 1251 | end; |
||
| 1252 | |||
| 1253 | if (not Result) then |
||
| 1254 | begin |
||
| 1255 | GlobalFree(AMedium.hGlobal); |
||
| 1256 | AMedium.hGlobal := 0; |
||
| 1257 | end else |
||
| 1258 | AMedium.tymed := TYMED_HGLOBAL; |
||
| 1259 | |||
| 1260 | end else |
||
| 1261 | Result := False; |
||
| 1262 | end; |
||
| 1263 | |||
| 1264 | |||
| 1265 | //////////////////////////////////////////////////////////////////////////////// |
||
| 1266 | // |
||
| 1267 | // TCustomStringClipboardFormat |
||
| 1268 | // |
||
| 1269 | //////////////////////////////////////////////////////////////////////////////// |
||
| 1270 | procedure TCustomStringClipboardFormat.Clear; |
||
| 1271 | begin |
||
| 1272 | FData := ''; |
||
| 1273 | end; |
||
| 1274 | |||
| 1275 | function TCustomStringClipboardFormat.HasData: boolean; |
||
| 1276 | begin |
||
| 1277 | Result := (FData <> ''); |
||
| 1278 | end; |
||
| 1279 | |||
| 1280 | |||
| 1281 | function TCustomStringClipboardFormat.ReadData(Value: pointer; |
||
| 1282 | Size: integer): boolean; |
||
| 1283 | begin |
||
| 1284 | SetLength(FData, Size); |
||
| 1285 | Move(Value^, PChar(FData)^, Size); |
||
| 1286 | |||
| 1287 | // IE adds a lot of trailing zeroes which is included in the string length. |
||
| 1288 | // To avoid confusion, we trim all trailing zeroes but the last (which is |
||
| 1289 | // managed automatically by Delphi). |
||
| 1290 | // Note that since this work around, if applied generally, would mean that we |
||
| 1291 | // couldn't use this class to handle arbitrary binary data (which might |
||
| 1292 | // include zeroes), we are required to explicitly enable it in the classes |
||
| 1293 | // where we need it (e.g. all TCustomTextClipboardFormat descedants). |
||
| 1294 | if (FTrimZeroes) then |
||
| 1295 | SetLength(FData, Length(PChar(FData))); |
||
| 1296 | |||
| 1297 | Result := True; |
||
| 1298 | end; |
||
| 1299 | |||
| 1300 | function TCustomStringClipboardFormat.WriteData(Value: pointer; |
||
| 1301 | Size: integer): boolean; |
||
| 1302 | begin |
||
| 1303 | // Transfer string including terminating zero if requested. |
||
| 1304 | Result := (Size <= Length(FData)+1); |
||
| 1305 | if (Result) then |
||
| 1306 | Move(PChar(FData)^, Value^, Size); |
||
| 1307 | end; |
||
| 1308 | |||
| 1309 | function TCustomStringClipboardFormat.GetSize: integer; |
||
| 1310 | begin |
||
| 1311 | Result := Length(FData); |
||
| 1312 | end; |
||
| 1313 | |||
| 1314 | function TCustomStringClipboardFormat.GetString: string; |
||
| 1315 | begin |
||
| 1316 | Result := FData; |
||
| 1317 | end; |
||
| 1318 | |||
| 1319 | procedure TCustomStringClipboardFormat.SetString(const Value: string); |
||
| 1320 | begin |
||
| 1321 | FData := Value; |
||
| 1322 | end; |
||
| 1323 | |||
| 1324 | |||
| 1325 | //////////////////////////////////////////////////////////////////////////////// |
||
| 1326 | // |
||
| 1327 | // TCustomStringListClipboardFormat |
||
| 1328 | // |
||
| 1329 | //////////////////////////////////////////////////////////////////////////////// |
||
| 1330 | constructor TCustomStringListClipboardFormat.Create; |
||
| 1331 | begin |
||
| 1332 | inherited Create; |
||
| 1333 | FLines := TStringList.Create |
||
| 1334 | end; |
||
| 1335 | |||
| 1336 | destructor TCustomStringListClipboardFormat.Destroy; |
||
| 1337 | begin |
||
| 1338 | FLines.Free; |
||
| 1339 | inherited Destroy; |
||
| 1340 | end; |
||
| 1341 | |||
| 1342 | procedure TCustomStringListClipboardFormat.Clear; |
||
| 1343 | begin |
||
| 1344 | FLines.Clear; |
||
| 1345 | end; |
||
| 1346 | |||
| 1347 | function TCustomStringListClipboardFormat.HasData: boolean; |
||
| 1348 | begin |
||
| 1349 | Result := (FLines.Count > 0); |
||
| 1350 | end; |
||
| 1351 | |||
| 1352 | function TCustomStringListClipboardFormat.ReadData(Value: pointer; |
||
| 1353 | Size: integer): boolean; |
||
| 1354 | var |
||
| 1355 | s : string; |
||
| 1356 | begin |
||
| 1357 | SetLength(s, Size+1); |
||
| 1358 | Move(Value^, PChar(s)^, Size); |
||
| 1359 | s[Size] := #0; |
||
| 1360 | FLines.Text := s; |
||
| 1361 | Result := True; |
||
| 1362 | end; |
||
| 1363 | |||
| 1364 | function TCustomStringListClipboardFormat.WriteData(Value: pointer; |
||
| 1365 | Size: integer): boolean; |
||
| 1366 | var |
||
| 1367 | s : string; |
||
| 1368 | begin |
||
| 1369 | s := FLines.Text; |
||
| 1370 | Result := (Size = Length(s)+1); |
||
| 1371 | if (Result) then |
||
| 1372 | Move(PChar(s)^, Value^, Size); |
||
| 1373 | end; |
||
| 1374 | |||
| 1375 | function TCustomStringListClipboardFormat.GetSize: integer; |
||
| 1376 | begin |
||
| 1377 | Result := Length(FLines.Text)+1; |
||
| 1378 | end; |
||
| 1379 | |||
| 1380 | function TCustomStringListClipboardFormat.GetLines: TStrings; |
||
| 1381 | begin |
||
| 1382 | Result := FLines; |
||
| 1383 | end; |
||
| 1384 | |||
| 1385 | |||
| 1386 | //////////////////////////////////////////////////////////////////////////////// |
||
| 1387 | // |
||
| 1388 | // TCustomTextClipboardFormat |
||
| 1389 | // |
||
| 1390 | //////////////////////////////////////////////////////////////////////////////// |
||
| 1391 | constructor TCustomTextClipboardFormat.Create; |
||
| 1392 | begin |
||
| 1393 | inherited Create; |
||
| 1394 | TrimZeroes := True; |
||
| 1395 | end; |
||
| 1396 | |||
| 1397 | function TCustomTextClipboardFormat.GetSize: integer; |
||
| 1398 | begin |
||
| 1399 | Result := inherited GetSize; |
||
| 1400 | // Unless the data is already zero terminated, we add a byte to include |
||
| 1401 | // the string's implicit terminating zero. |
||
| 1402 | if (Data[Result] <> #0) then |
||
| 1403 | inc(Result); |
||
| 1404 | end; |
||
| 1405 | |||
| 1406 | |||
| 1407 | //////////////////////////////////////////////////////////////////////////////// |
||
| 1408 | // |
||
| 1409 | // TCustomWideTextClipboardFormat |
||
| 1410 | // |
||
| 1411 | //////////////////////////////////////////////////////////////////////////////// |
||
| 1412 | procedure TCustomWideTextClipboardFormat.Clear; |
||
| 1413 | begin |
||
| 1414 | FText := ''; |
||
| 1415 | end; |
||
| 1416 | |||
| 1417 | function TCustomWideTextClipboardFormat.HasData: boolean; |
||
| 1418 | begin |
||
| 1419 | Result := (FText <> ''); |
||
| 1420 | end; |
||
| 1421 | |||
| 1422 | function TCustomWideTextClipboardFormat.ReadData(Value: pointer; |
||
| 1423 | Size: integer): boolean; |
||
| 1424 | begin |
||
| 1425 | SetLength(FText, Size div 2); |
||
| 1426 | Move(Value^, PWideChar(FText)^, Size); |
||
| 1427 | Result := True; |
||
| 1428 | end; |
||
| 1429 | |||
| 1430 | function TCustomWideTextClipboardFormat.WriteData(Value: pointer; |
||
| 1431 | Size: integer): boolean; |
||
| 1432 | begin |
||
| 1433 | Result := (Size <= (Length(FText)+1)*2); |
||
| 1434 | if (Result) then |
||
| 1435 | Move(PWideChar(FText)^, Value^, Size); |
||
| 1436 | end; |
||
| 1437 | |||
| 1438 | function TCustomWideTextClipboardFormat.GetSize: integer; |
||
| 1439 | begin |
||
| 1440 | Result := Length(FText)*2; |
||
| 1441 | // Unless the data is already zero terminated, we add two bytes to include |
||
| 1442 | // the string's implicit terminating zero. |
||
| 1443 | if (FText[Result] <> #0) then |
||
| 1444 | inc(Result, 2); |
||
| 1445 | end; |
||
| 1446 | |||
| 1447 | function TCustomWideTextClipboardFormat.GetText: WideString; |
||
| 1448 | begin |
||
| 1449 | Result := FText; |
||
| 1450 | end; |
||
| 1451 | |||
| 1452 | procedure TCustomWideTextClipboardFormat.SetText(const Value: WideString); |
||
| 1453 | begin |
||
| 1454 | FText := Value; |
||
| 1455 | end; |
||
| 1456 | |||
| 1457 | |||
| 1458 | //////////////////////////////////////////////////////////////////////////////// |
||
| 1459 | // |
||
| 1460 | // TTextClipboardFormat |
||
| 1461 | // |
||
| 1462 | //////////////////////////////////////////////////////////////////////////////// |
||
| 1463 | function TTextClipboardFormat.GetClipboardFormat: TClipFormat; |
||
| 1464 | begin |
||
| 1465 | Result := CF_TEXT; |
||
| 1466 | end; |
||
| 1467 | |||
| 1468 | |||
| 1469 | //////////////////////////////////////////////////////////////////////////////// |
||
| 1470 | // |
||
| 1471 | // TCustomDWORDClipboardFormat |
||
| 1472 | // |
||
| 1473 | //////////////////////////////////////////////////////////////////////////////// |
||
| 1474 | function TCustomDWORDClipboardFormat.ReadData(Value: pointer; |
||
| 1475 | Size: integer): boolean; |
||
| 1476 | begin |
||
| 1477 | FValue := PDWORD(Value)^; |
||
| 1478 | Result := True; |
||
| 1479 | end; |
||
| 1480 | |||
| 1481 | function TCustomDWORDClipboardFormat.WriteData(Value: pointer; |
||
| 1482 | Size: integer): boolean; |
||
| 1483 | begin |
||
| 1484 | Result := (Size = SizeOf(DWORD)); |
||
| 1485 | if (Result) then |
||
| 1486 | PDWORD(Value)^ := FValue; |
||
| 1487 | end; |
||
| 1488 | |||
| 1489 | function TCustomDWORDClipboardFormat.GetSize: integer; |
||
| 1490 | begin |
||
| 1491 | Result := SizeOf(DWORD); |
||
| 1492 | end; |
||
| 1493 | |||
| 1494 | procedure TCustomDWORDClipboardFormat.Clear; |
||
| 1495 | begin |
||
| 1496 | FValue := 0; |
||
| 1497 | end; |
||
| 1498 | |||
| 1499 | function TCustomDWORDClipboardFormat.GetValueDWORD: DWORD; |
||
| 1500 | begin |
||
| 1501 | Result := FValue; |
||
| 1502 | end; |
||
| 1503 | |||
| 1504 | procedure TCustomDWORDClipboardFormat.SetValueDWORD(Value: DWORD); |
||
| 1505 | begin |
||
| 1506 | FValue := Value; |
||
| 1507 | end; |
||
| 1508 | |||
| 1509 | function TCustomDWORDClipboardFormat.GetValueInteger: integer; |
||
| 1510 | begin |
||
| 1511 | Result := integer(FValue); |
||
| 1512 | end; |
||
| 1513 | |||
| 1514 | procedure TCustomDWORDClipboardFormat.SetValueInteger(Value: integer); |
||
| 1515 | begin |
||
| 1516 | FValue := DWORD(Value); |
||
| 1517 | end; |
||
| 1518 | |||
| 1519 | function TCustomDWORDClipboardFormat.GetValueLongInt: longInt; |
||
| 1520 | begin |
||
| 1521 | Result := longInt(FValue); |
||
| 1522 | end; |
||
| 1523 | |||
| 1524 | procedure TCustomDWORDClipboardFormat.SetValueLongInt(Value: longInt); |
||
| 1525 | begin |
||
| 1526 | FValue := DWORD(Value); |
||
| 1527 | end; |
||
| 1528 | |||
| 1529 | function TCustomDWORDClipboardFormat.GetValueBoolean: boolean; |
||
| 1530 | begin |
||
| 1531 | Result := (FValue <> 0); |
||
| 1532 | end; |
||
| 1533 | |||
| 1534 | procedure TCustomDWORDClipboardFormat.SetValueBoolean(Value: boolean); |
||
| 1535 | begin |
||
| 1536 | FValue := ord(Value); |
||
| 1537 | end; |
||
| 1538 | |||
| 1539 | |||
| 1540 | //////////////////////////////////////////////////////////////////////////////// |
||
| 1541 | // |
||
| 1542 | // TFileGroupDescritorClipboardFormat |
||
| 1543 | // |
||
| 1544 | //////////////////////////////////////////////////////////////////////////////// |
||
| 1545 | var |
||
| 1546 | CF_FILEGROUPDESCRIPTOR: TClipFormat = 0; |
||
| 1547 | |||
| 1548 | function TFileGroupDescritorClipboardFormat.GetClipboardFormat: TClipFormat; |
||
| 1549 | begin |
||
| 1550 | if (CF_FILEGROUPDESCRIPTOR = 0) then |
||
| 1551 | CF_FILEGROUPDESCRIPTOR := RegisterClipboardFormat(CFSTR_FILEDESCRIPTOR); |
||
| 1552 | Result := CF_FILEGROUPDESCRIPTOR; |
||
| 1553 | end; |
||
| 1554 | |||
| 1555 | destructor TFileGroupDescritorClipboardFormat.Destroy; |
||
| 1556 | begin |
||
| 1557 | Clear; |
||
| 1558 | inherited Destroy; |
||
| 1559 | end; |
||
| 1560 | |||
| 1561 | procedure TFileGroupDescritorClipboardFormat.Clear; |
||
| 1562 | begin |
||
| 1563 | if (FFileGroupDescriptor <> nil) then |
||
| 1564 | begin |
||
| 1565 | FreeMem(FFileGroupDescriptor); |
||
| 1566 | FFileGroupDescriptor := nil; |
||
| 1567 | end; |
||
| 1568 | end; |
||
| 1569 | |||
| 1570 | function TFileGroupDescritorClipboardFormat.HasData: boolean; |
||
| 1571 | begin |
||
| 1572 | Result := (FFileGroupDescriptor <> nil) and (FFileGroupDescriptor^.cItems <> 0); |
||
| 1573 | end; |
||
| 1574 | |||
| 1575 | procedure TFileGroupDescritorClipboardFormat.CopyFrom(AFileGroupDescriptor: PFileGroupDescriptor); |
||
| 1576 | var |
||
| 1577 | Size : integer; |
||
| 1578 | begin |
||
| 1579 | Clear; |
||
| 1580 | if (AFileGroupDescriptor <> nil) then |
||
| 1581 | begin |
||
| 1582 | Size := SizeOf(UINT) + AFileGroupDescriptor^.cItems * SizeOf(TFileDescriptor); |
||
| 1583 | GetMem(FFileGroupDescriptor, Size); |
||
| 1584 | Move(AFileGroupDescriptor^, FFileGroupDescriptor^, Size); |
||
| 1585 | end; |
||
| 1586 | end; |
||
| 1587 | |||
| 1588 | function TFileGroupDescritorClipboardFormat.GetSize: integer; |
||
| 1589 | begin |
||
| 1590 | if (FFileGroupDescriptor <> nil) then |
||
| 1591 | Result := SizeOf(UINT) + FFileGroupDescriptor^.cItems * SizeOf(TFileDescriptor) |
||
| 1592 | else |
||
| 1593 | Result := 0; |
||
| 1594 | end; |
||
| 1595 | |||
| 1596 | function TFileGroupDescritorClipboardFormat.ReadData(Value: pointer; |
||
| 1597 | Size: integer): boolean; |
||
| 1598 | begin |
||
| 1599 | // Validate size against count |
||
| 1600 | Result := |
||
| 1601 | (Size - SizeOf(UINT)) DIV SizeOf(TFileDescriptor) = integer(PFileGroupDescriptor(Value)^.cItems); |
||
| 1602 | if (Result) then |
||
| 1603 | CopyFrom(PFileGroupDescriptor(Value)); |
||
| 1604 | end; |
||
| 1605 | |||
| 1606 | function TFileGroupDescritorClipboardFormat.WriteData(Value: pointer; |
||
| 1607 | Size: integer): boolean; |
||
| 1608 | begin |
||
| 1609 | // Validate size against count |
||
| 1610 | Result := (FFileGroupDescriptor <> nil) and |
||
| 1611 | ((Size - SizeOf(UINT)) DIV SizeOf(TFileDescriptor) = integer(FFileGroupDescriptor^.cItems)); |
||
| 1612 | |||
| 1613 | if (Result) then |
||
| 1614 | Move(FFileGroupDescriptor^, Value^, Size); |
||
| 1615 | end; |
||
| 1616 | |||
| 1617 | |||
| 1618 | //////////////////////////////////////////////////////////////////////////////// |
||
| 1619 | // |
||
| 1620 | // TFileGroupDescritorWClipboardFormat |
||
| 1621 | // |
||
| 1622 | //////////////////////////////////////////////////////////////////////////////// |
||
| 1623 | var |
||
| 1624 | CF_FILEGROUPDESCRIPTORW: TClipFormat = 0; |
||
| 1625 | |||
| 1626 | function TFileGroupDescritorWClipboardFormat.GetClipboardFormat: TClipFormat; |
||
| 1627 | begin |
||
| 1628 | if (CF_FILEGROUPDESCRIPTORW = 0) then |
||
| 1629 | CF_FILEGROUPDESCRIPTORW := RegisterClipboardFormat(CFSTR_FILEDESCRIPTORW); |
||
| 1630 | Result := CF_FILEGROUPDESCRIPTORW; |
||
| 1631 | end; |
||
| 1632 | |||
| 1633 | destructor TFileGroupDescritorWClipboardFormat.Destroy; |
||
| 1634 | begin |
||
| 1635 | Clear; |
||
| 1636 | inherited Destroy; |
||
| 1637 | end; |
||
| 1638 | |||
| 1639 | procedure TFileGroupDescritorWClipboardFormat.Clear; |
||
| 1640 | begin |
||
| 1641 | if (FFileGroupDescriptor <> nil) then |
||
| 1642 | begin |
||
| 1643 | FreeMem(FFileGroupDescriptor); |
||
| 1644 | FFileGroupDescriptor := nil; |
||
| 1645 | end; |
||
| 1646 | end; |
||
| 1647 | |||
| 1648 | function TFileGroupDescritorWClipboardFormat.HasData: boolean; |
||
| 1649 | begin |
||
| 1650 | Result := (FFileGroupDescriptor <> nil) and (FFileGroupDescriptor^.cItems <> 0); |
||
| 1651 | end; |
||
| 1652 | |||
| 1653 | procedure TFileGroupDescritorWClipboardFormat.CopyFrom(AFileGroupDescriptor: PFileGroupDescriptorW); |
||
| 1654 | var |
||
| 1655 | Size : integer; |
||
| 1656 | begin |
||
| 1657 | Clear; |
||
| 1658 | if (AFileGroupDescriptor <> nil) then |
||
| 1659 | begin |
||
| 1660 | Size := SizeOf(UINT) + AFileGroupDescriptor^.cItems * SizeOf(TFileDescriptorW); |
||
| 1661 | GetMem(FFileGroupDescriptor, Size); |
||
| 1662 | Move(AFileGroupDescriptor^, FFileGroupDescriptor^, Size); |
||
| 1663 | end; |
||
| 1664 | end; |
||
| 1665 | |||
| 1666 | function TFileGroupDescritorWClipboardFormat.GetSize: integer; |
||
| 1667 | begin |
||
| 1668 | if (FFileGroupDescriptor <> nil) then |
||
| 1669 | Result := SizeOf(UINT) + FFileGroupDescriptor^.cItems * SizeOf(TFileDescriptorW) |
||
| 1670 | else |
||
| 1671 | Result := 0; |
||
| 1672 | end; |
||
| 1673 | |||
| 1674 | function TFileGroupDescritorWClipboardFormat.ReadData(Value: pointer; |
||
| 1675 | Size: integer): boolean; |
||
| 1676 | begin |
||
| 1677 | // Validate size against count |
||
| 1678 | Result := |
||
| 1679 | (Size - SizeOf(UINT)) DIV SizeOf(TFileDescriptorW) = integer(PFileGroupDescriptor(Value)^.cItems); |
||
| 1680 | if (Result) then |
||
| 1681 | CopyFrom(PFileGroupDescriptorW(Value)); |
||
| 1682 | end; |
||
| 1683 | |||
| 1684 | function TFileGroupDescritorWClipboardFormat.WriteData(Value: pointer; |
||
| 1685 | Size: integer): boolean; |
||
| 1686 | begin |
||
| 1687 | // Validate size against count |
||
| 1688 | Result := (FFileGroupDescriptor <> nil) and |
||
| 1689 | ((Size - SizeOf(UINT)) DIV SizeOf(TFileDescriptorW) = integer(FFileGroupDescriptor^.cItems)); |
||
| 1690 | |||
| 1691 | if (Result) then |
||
| 1692 | Move(FFileGroupDescriptor^, Value^, Size); |
||
| 1693 | end; |
||
| 1694 | |||
| 1695 | |||
| 1696 | //////////////////////////////////////////////////////////////////////////////// |
||
| 1697 | // |
||
| 1698 | // TFileContentsClipboardFormat |
||
| 1699 | // |
||
| 1700 | //////////////////////////////////////////////////////////////////////////////// |
||
| 1701 | var |
||
| 1702 | CF_FILECONTENTS: TClipFormat = 0; |
||
| 1703 | |||
| 1704 | constructor TFileContentsClipboardFormat.Create; |
||
| 1705 | begin |
||
| 1706 | inherited Create; |
||
| 1707 | FFormatEtc.lindex := 0; |
||
| 1708 | end; |
||
| 1709 | |||
| 1710 | function TFileContentsClipboardFormat.GetClipboardFormat: TClipFormat; |
||
| 1711 | begin |
||
| 1712 | if (CF_FILECONTENTS = 0) then |
||
| 1713 | CF_FILECONTENTS := RegisterClipboardFormat(CFSTR_FILECONTENTS); |
||
| 1714 | Result := CF_FILECONTENTS; |
||
| 1715 | end; |
||
| 1716 | |||
| 1717 | |||
| 1718 | //////////////////////////////////////////////////////////////////////////////// |
||
| 1719 | // |
||
| 1720 | // TFileContentsStreamClipboardFormat |
||
| 1721 | // |
||
| 1722 | //////////////////////////////////////////////////////////////////////////////// |
||
| 1723 | constructor TFileContentsStreamClipboardFormat.Create; |
||
| 1724 | begin |
||
| 1725 | CreateFormat(TYMED_ISTREAM); |
||
| 1726 | FStreams := TStreamList.Create; |
||
| 1727 | end; |
||
| 1728 | |||
| 1729 | destructor TFileContentsStreamClipboardFormat.Destroy; |
||
| 1730 | begin |
||
| 1731 | Clear; |
||
| 1732 | FStreams.Free; |
||
| 1733 | inherited Destroy; |
||
| 1734 | end; |
||
| 1735 | |||
| 1736 | function TFileContentsStreamClipboardFormat.GetClipboardFormat: TClipFormat; |
||
| 1737 | begin |
||
| 1738 | if (CF_FILECONTENTS = 0) then |
||
| 1739 | CF_FILECONTENTS := RegisterClipboardFormat(CFSTR_FILECONTENTS); |
||
| 1740 | Result := CF_FILECONTENTS; |
||
| 1741 | end; |
||
| 1742 | |||
| 1743 | procedure TFileContentsStreamClipboardFormat.Clear; |
||
| 1744 | begin |
||
| 1745 | FStreams.Clear; |
||
| 1746 | end; |
||
| 1747 | |||
| 1748 | function TFileContentsStreamClipboardFormat.HasData: boolean; |
||
| 1749 | begin |
||
| 1750 | Result := (FStreams.Count > 0); |
||
| 1751 | end; |
||
| 1752 | |||
| 1753 | function TFileContentsStreamClipboardFormat.AssignTo(Dest: TCustomDataFormat): boolean; |
||
| 1754 | begin |
||
| 1755 | Result := True; |
||
| 1756 | if (Dest is TDataStreamDataFormat) then |
||
| 1757 | begin |
||
| 1758 | TDataStreamDataFormat(Dest).Streams.Assign(Streams); |
||
| 1759 | end else |
||
| 1760 | Result := inherited AssignTo(Dest); |
||
| 1761 | end; |
||
| 1762 | |||
| 1763 | {$IFOPT R+} |
||
| 1764 | {$DEFINE R_PLUS} |
||
| 1765 | {$RANGECHECKS OFF} |
||
| 1766 | {$ENDIF} |
||
| 1767 | function TFileContentsStreamClipboardFormat.GetData(DataObject: IDataObject): boolean; |
||
| 1768 | var |
||
| 1769 | FGD: TFileGroupDescritorClipboardFormat; |
||
| 1770 | Count: integer; |
||
| 1771 | Medium: TStgMedium; |
||
| 1772 | Stream: IStream; |
||
| 1773 | Name: string; |
||
| 1774 | MemStream: TMemoryStream; |
||
| 1775 | StatStg: TStatStg; |
||
| 1776 | Size: longInt; |
||
| 1777 | Remaining: longInt; |
||
| 1778 | pChunk: PChar; |
||
| 1779 | begin |
||
| 1780 | Result := False; |
||
| 1781 | |||
| 1782 | Clear; |
||
| 1783 | FGD := TFileGroupDescritorClipboardFormat.Create; |
||
| 1784 | try |
||
| 1785 | if (FGD.GetData(DataObject)) then |
||
| 1786 | begin |
||
| 1787 | // Multiple objects, retrieve one at a time |
||
| 1788 | Count := FGD.FileGroupDescriptor^.cItems; |
||
| 1789 | FFormatEtc.lindex := 0; |
||
| 1790 | end else |
||
| 1791 | begin |
||
| 1792 | // Single object, retrieve "all" at once |
||
| 1793 | Count := 0; |
||
| 1794 | FFormatEtc.lindex := -1; |
||
| 1795 | Name := ''; |
||
| 1796 | end; |
||
| 1797 | while (FFormatEtc.lindex < Count) do |
||
| 1798 | begin |
||
| 1799 | if (DataObject.GetData(FormatEtc, Medium) <> S_OK) then |
||
| 1800 | break; |
||
| 1801 | try |
||
| 1802 | inc(FFormatEtc.lindex); |
||
| 1803 | if (Medium.tymed <> TYMED_ISTREAM) then |
||
| 1804 | continue; |
||
| 1805 | Stream := IStream(Medium.stm); |
||
| 1806 | Stream.Stat(StatStg, STATFLAG_NONAME); |
||
| 1807 | MemStream := TMemoryStream.Create; |
||
| 1808 | try |
||
| 1809 | Remaining := StatStg.cbSize; |
||
| 1810 | MemStream.Size := Remaining; |
||
| 1811 | pChunk := MemStream.Memory; |
||
| 1812 | while (Remaining > 0) do |
||
| 1813 | begin |
||
| 1814 | if (Stream.Read(pChunk, Remaining, @Size) <> S_OK) or |
||
| 1815 | (Size = 0) then |
||
| 1816 | break; |
||
| 1817 | inc(pChunk, Size); |
||
| 1818 | dec(Remaining, Size); |
||
| 1819 | end; |
||
| 1820 | |||
| 1821 | if (FFormatEtc.lindex > 0) then |
||
| 1822 | Name := FGD.FileGroupDescriptor^.fgd[FFormatEtc.lindex-1].cFileName; |
||
| 1823 | Streams.AddNamed(MemStream, Name); |
||
| 1824 | except |
||
| 1825 | MemStream.Free; |
||
| 1826 | raise; |
||
| 1827 | end; |
||
| 1828 | Stream := nil; |
||
| 1829 | Result := True; |
||
| 1830 | finally |
||
| 1831 | ReleaseStgMedium(Medium); |
||
| 1832 | end; |
||
| 1833 | end; |
||
| 1834 | finally |
||
| 1835 | FGD.Free; |
||
| 1836 | end; |
||
| 1837 | end; |
||
| 1838 | {$IFDEF R_PLUS} |
||
| 1839 | {$RANGECHECKS ON} |
||
| 1840 | {$UNDEF R_PLUS} |
||
| 1841 | {$ENDIF} |
||
| 1842 | |||
| 1843 | |||
| 1844 | //////////////////////////////////////////////////////////////////////////////// |
||
| 1845 | // |
||
| 1846 | // TFileContentsStreamOnDemandClipboardFormat |
||
| 1847 | // |
||
| 1848 | //////////////////////////////////////////////////////////////////////////////// |
||
| 1849 | constructor TFileContentsStreamOnDemandClipboardFormat.Create; |
||
| 1850 | begin |
||
| 1851 | CreateFormat(TYMED_ISTREAM); |
||
| 1852 | end; |
||
| 1853 | |||
| 1854 | destructor TFileContentsStreamOnDemandClipboardFormat.Destroy; |
||
| 1855 | begin |
||
| 1856 | Clear; |
||
| 1857 | inherited Destroy; |
||
| 1858 | end; |
||
| 1859 | |||
| 1860 | function TFileContentsStreamOnDemandClipboardFormat.GetClipboardFormat: TClipFormat; |
||
| 1861 | begin |
||
| 1862 | if (CF_FILECONTENTS = 0) then |
||
| 1863 | CF_FILECONTENTS := RegisterClipboardFormat(CFSTR_FILECONTENTS); |
||
| 1864 | Result := CF_FILECONTENTS; |
||
| 1865 | end; |
||
| 1866 | |||
| 1867 | procedure TFileContentsStreamOnDemandClipboardFormat.Clear; |
||
| 1868 | begin |
||
| 1869 | FGotData := False; |
||
| 1870 | FDataRequested := False; |
||
| 1871 | end; |
||
| 1872 | |||
| 1873 | function TFileContentsStreamOnDemandClipboardFormat.HasData: boolean; |
||
| 1874 | begin |
||
| 1875 | Result := FGotData or FDataRequested; |
||
| 1876 | end; |
||
| 1877 | |||
| 1878 | function TFileContentsStreamOnDemandClipboardFormat.AssignTo(Dest: TCustomDataFormat): boolean; |
||
| 1879 | begin |
||
| 1880 | if (Dest is TVirtualFileStreamDataFormat) then |
||
| 1881 | begin |
||
| 1882 | Result := True |
||
| 1883 | end else |
||
| 1884 | Result := inherited AssignTo(Dest); |
||
| 1885 | end; |
||
| 1886 | |||
| 1887 | function TFileContentsStreamOnDemandClipboardFormat.Assign( |
||
| 1888 | Source: TCustomDataFormat): boolean; |
||
| 1889 | begin |
||
| 1890 | if (Source is TVirtualFileStreamDataFormat) then |
||
| 1891 | begin |
||
| 1892 | // Acknowledge that we can offer the requested data, but defer the actual |
||
| 1893 | // data transfer. |
||
| 1894 | FDataRequested := True; |
||
| 1895 | Result := True |
||
| 1896 | end else |
||
| 1897 | Result := inherited Assign(Source); |
||
| 1898 | end; |
||
| 1899 | |||
| 1900 | function TFileContentsStreamOnDemandClipboardFormat.DoSetData( |
||
| 1901 | const FormatEtcIn: TFormatEtc; var AMedium: TStgMedium): boolean; |
||
| 1902 | var |
||
| 1903 | Stream : IStream; |
||
| 1904 | begin |
||
| 1905 | if (Assigned(FOnGetStream)) and (FormatEtcIn.tymed and TYMED_ISTREAM <> 0) and |
||
| 1906 | (FormatEtcIn.lindex <> -1) then |
||
| 1907 | begin |
||
| 1908 | FOnGetStream(Self, FormatEtcIn.lindex, Stream); |
||
| 1909 | |||
| 1910 | if (Stream <> nil) then |
||
| 1911 | begin |
||
| 1912 | IStream(AMedium.stm) := Stream; |
||
| 1913 | AMedium.tymed := TYMED_ISTREAM; |
||
| 1914 | Result := True; |
||
| 1915 | end else |
||
| 1916 | Result := False; |
||
| 1917 | |||
| 1918 | end else |
||
| 1919 | Result := False; |
||
| 1920 | end; |
||
| 1921 | |||
| 1922 | function TFileContentsStreamOnDemandClipboardFormat.GetData(DataObject: IDataObject): boolean; |
||
| 1923 | begin |
||
| 1924 | // Flag that data has been offered to us, but defer the actual data transfer. |
||
| 1925 | FGotData := True; |
||
| 1926 | Result := True; |
||
| 1927 | end; |
||
| 1928 | |||
| 1929 | function TFileContentsStreamOnDemandClipboardFormat.GetStream(Index: integer): IStream; |
||
| 1930 | var |
||
| 1931 | Medium : TStgMedium; |
||
| 1932 | begin |
||
| 1933 | Result := nil; |
||
| 1934 | FFormatEtc.lindex := Index; |
||
| 1935 | // Get an IStream interface from the source. |
||
| 1936 | if ((DataFormat.Owner as TCustomDroptarget).DataObject.GetData(FormatEtc, |
||
| 1937 | Medium) = S_OK) and (Medium.tymed = TYMED_ISTREAM) then |
||
| 1938 | try |
||
| 1939 | Result := IStream(Medium.stm); |
||
| 1940 | finally |
||
| 1941 | ReleaseStgMedium(Medium); |
||
| 1942 | end; |
||
| 1943 | end; |
||
| 1944 | |||
| 1945 | |||
| 1946 | //////////////////////////////////////////////////////////////////////////////// |
||
| 1947 | // |
||
| 1948 | // TFileContentsStorageClipboardFormat |
||
| 1949 | // |
||
| 1950 | //////////////////////////////////////////////////////////////////////////////// |
||
| 1951 | constructor TFileContentsStorageClipboardFormat.Create; |
||
| 1952 | begin |
||
| 1953 | CreateFormat(TYMED_ISTORAGE); |
||
| 1954 | FStorages := TStorageInterfaceList.Create; |
||
| 1955 | end; |
||
| 1956 | |||
| 1957 | destructor TFileContentsStorageClipboardFormat.Destroy; |
||
| 1958 | begin |
||
| 1959 | Clear; |
||
| 1960 | FStorages.Free; |
||
| 1961 | inherited Destroy; |
||
| 1962 | end; |
||
| 1963 | |||
| 1964 | function TFileContentsStorageClipboardFormat.GetClipboardFormat: TClipFormat; |
||
| 1965 | begin |
||
| 1966 | if (CF_FILECONTENTS = 0) then |
||
| 1967 | CF_FILECONTENTS := RegisterClipboardFormat(CFSTR_FILECONTENTS); |
||
| 1968 | Result := CF_FILECONTENTS; |
||
| 1969 | end; |
||
| 1970 | |||
| 1971 | procedure TFileContentsStorageClipboardFormat.Clear; |
||
| 1972 | begin |
||
| 1973 | FStorages.Clear; |
||
| 1974 | end; |
||
| 1975 | |||
| 1976 | function TFileContentsStorageClipboardFormat.HasData: boolean; |
||
| 1977 | begin |
||
| 1978 | Result := (FStorages.Count > 0); |
||
| 1979 | end; |
||
| 1980 | |||
| 1981 | function TFileContentsStorageClipboardFormat.AssignTo(Dest: TCustomDataFormat): boolean; |
||
| 1982 | begin |
||
| 1983 | (* |
||
| 1984 | Result := True; |
||
| 1985 | if (Dest is TDataStreamDataFormat) then |
||
| 1986 | begin |
||
| 1987 | TDataStreamDataFormat(Dest).Streams.Assign(Streams); |
||
| 1988 | end else |
||
| 1989 | *) |
||
| 1990 | Result := inherited AssignTo(Dest); |
||
| 1991 | end; |
||
| 1992 | |||
| 1993 | {$IFOPT R+} |
||
| 1994 | {$DEFINE R_PLUS} |
||
| 1995 | {$RANGECHECKS OFF} |
||
| 1996 | {$ENDIF} |
||
| 1997 | function TFileContentsStorageClipboardFormat.GetData(DataObject: IDataObject): boolean; |
||
| 1998 | var |
||
| 1999 | FGD : TFileGroupDescritorClipboardFormat; |
||
| 2000 | Count : integer; |
||
| 2001 | Medium : TStgMedium; |
||
| 2002 | Storage : IStorage; |
||
| 2003 | Name : string; |
||
| 2004 | begin |
||
| 2005 | Result := False; |
||
| 2006 | |||
| 2007 | Clear; |
||
| 2008 | FGD := TFileGroupDescritorClipboardFormat.Create; |
||
| 2009 | try |
||
| 2010 | if (FGD.GetData(DataObject)) then |
||
| 2011 | begin |
||
| 2012 | // Multiple objects, retrieve one at a time |
||
| 2013 | Count := FGD.FileGroupDescriptor^.cItems; |
||
| 2014 | FFormatEtc.lindex := 0; |
||
| 2015 | end else |
||
| 2016 | begin |
||
| 2017 | // Single object, retrieve "all" at once |
||
| 2018 | Count := 0; |
||
| 2019 | FFormatEtc.lindex := -1; |
||
| 2020 | Name := ''; |
||
| 2021 | end; |
||
| 2022 | while (FFormatEtc.lindex < Count) do |
||
| 2023 | begin |
||
| 2024 | if (DataObject.GetData(FormatEtc, Medium) <> S_OK) then |
||
| 2025 | break; |
||
| 2026 | try |
||
| 2027 | inc(FFormatEtc.lindex); |
||
| 2028 | if (Medium.tymed <> TYMED_ISTORAGE) then |
||
| 2029 | continue; |
||
| 2030 | Storage := IStorage(Medium.stg); |
||
| 2031 | if (FFormatEtc.lindex > 0) then |
||
| 2032 | Name := FGD.FileGroupDescriptor^.fgd[FFormatEtc.lindex-1].cFileName; |
||
| 2033 | Storages.AddNamed(Storage, Name); |
||
| 2034 | Storage := nil; |
||
| 2035 | Result := True; |
||
| 2036 | finally |
||
| 2037 | ReleaseStgMedium(Medium); |
||
| 2038 | end; |
||
| 2039 | end; |
||
| 2040 | finally |
||
| 2041 | FGD.Free; |
||
| 2042 | end; |
||
| 2043 | end; |
||
| 2044 | {$IFDEF R_PLUS} |
||
| 2045 | {$RANGECHECKS ON} |
||
| 2046 | {$UNDEF R_PLUS} |
||
| 2047 | {$ENDIF} |
||
| 2048 | |||
| 2049 | |||
| 2050 | //////////////////////////////////////////////////////////////////////////////// |
||
| 2051 | // |
||
| 2052 | // TPreferredDropEffectClipboardFormat |
||
| 2053 | // |
||
| 2054 | //////////////////////////////////////////////////////////////////////////////// |
||
| 2055 | var |
||
| 2056 | CF_PREFERREDDROPEFFECT: TClipFormat = 0; |
||
| 2057 | |||
| 2058 | // GetClassClipboardFormat is used by TCustomDropTarget.GetPreferredDropEffect |
||
| 2059 | class function TPreferredDropEffectClipboardFormat.GetClassClipboardFormat: TClipFormat; |
||
| 2060 | begin |
||
| 2061 | if (CF_PREFERREDDROPEFFECT = 0) then |
||
| 2062 | CF_PREFERREDDROPEFFECT := RegisterClipboardFormat(CFSTR_PREFERREDDROPEFFECT); |
||
| 2063 | Result := CF_PREFERREDDROPEFFECT; |
||
| 2064 | end; |
||
| 2065 | |||
| 2066 | function TPreferredDropEffectClipboardFormat.GetClipboardFormat: TClipFormat; |
||
| 2067 | begin |
||
| 2068 | Result := GetClassClipboardFormat; |
||
| 2069 | end; |
||
| 2070 | |||
| 2071 | function TPreferredDropEffectClipboardFormat.HasData: boolean; |
||
| 2072 | begin |
||
| 2073 | Result := True; //(Value <> DROPEFFECT_NONE); |
||
| 2074 | end; |
||
| 2075 | |||
| 2076 | |||
| 2077 | //////////////////////////////////////////////////////////////////////////////// |
||
| 2078 | // |
||
| 2079 | // TPerformedDropEffectClipboardFormat |
||
| 2080 | // |
||
| 2081 | //////////////////////////////////////////////////////////////////////////////// |
||
| 2082 | var |
||
| 2083 | CF_PERFORMEDDROPEFFECT: TClipFormat = 0; |
||
| 2084 | |||
| 2085 | function TPerformedDropEffectClipboardFormat.GetClipboardFormat: TClipFormat; |
||
| 2086 | begin |
||
| 2087 | if (CF_PERFORMEDDROPEFFECT = 0) then |
||
| 2088 | CF_PERFORMEDDROPEFFECT := RegisterClipboardFormat(CFSTR_PERFORMEDDROPEFFECT); |
||
| 2089 | Result := CF_PERFORMEDDROPEFFECT; |
||
| 2090 | end; |
||
| 2091 | |||
| 2092 | |||
| 2093 | //////////////////////////////////////////////////////////////////////////////// |
||
| 2094 | // |
||
| 2095 | // TLogicalPerformedDropEffectClipboardFormat |
||
| 2096 | // |
||
| 2097 | //////////////////////////////////////////////////////////////////////////////// |
||
| 2098 | var |
||
| 2099 | CF_LOGICALPERFORMEDDROPEFFECT: TClipFormat = 0; |
||
| 2100 | |||
| 2101 | function TLogicalPerformedDropEffectClipboardFormat.GetClipboardFormat: TClipFormat; |
||
| 2102 | begin |
||
| 2103 | if (CF_LOGICALPERFORMEDDROPEFFECT = 0) then |
||
| 2104 | CF_LOGICALPERFORMEDDROPEFFECT := RegisterClipboardFormat('Logical Performed DropEffect'); // *** DO NOT LOCALIZE *** |
||
| 2105 | Result := CF_LOGICALPERFORMEDDROPEFFECT; |
||
| 2106 | end; |
||
| 2107 | |||
| 2108 | |||
| 2109 | |||
| 2110 | //////////////////////////////////////////////////////////////////////////////// |
||
| 2111 | // |
||
| 2112 | // TPasteSuccededClipboardFormat |
||
| 2113 | // |
||
| 2114 | //////////////////////////////////////////////////////////////////////////////// |
||
| 2115 | var |
||
| 2116 | CF_PASTESUCCEEDED: TClipFormat = 0; |
||
| 2117 | |||
| 2118 | function TPasteSuccededClipboardFormat.GetClipboardFormat: TClipFormat; |
||
| 2119 | begin |
||
| 2120 | if (CF_PASTESUCCEEDED = 0) then |
||
| 2121 | CF_PASTESUCCEEDED := RegisterClipboardFormat(CFSTR_PASTESUCCEEDED); |
||
| 2122 | Result := CF_PASTESUCCEEDED; |
||
| 2123 | end; |
||
| 2124 | |||
| 2125 | |||
| 2126 | //////////////////////////////////////////////////////////////////////////////// |
||
| 2127 | // |
||
| 2128 | // TInShellDragLoopClipboardFormat |
||
| 2129 | // |
||
| 2130 | //////////////////////////////////////////////////////////////////////////////// |
||
| 2131 | var |
||
| 2132 | CF_InDragLoop: TClipFormat = 0; |
||
| 2133 | |||
| 2134 | function TInShellDragLoopClipboardFormat.GetClipboardFormat: TClipFormat; |
||
| 2135 | begin |
||
| 2136 | if (CF_InDragLoop = 0) then |
||
| 2137 | CF_InDragLoop := RegisterClipboardFormat(CFSTR_InDragLoop); |
||
| 2138 | Result := CF_InDragLoop; |
||
| 2139 | end; |
||
| 2140 | |||
| 2141 | |||
| 2142 | //////////////////////////////////////////////////////////////////////////////// |
||
| 2143 | // |
||
| 2144 | // TTargetCLSIDClipboardFormat |
||
| 2145 | // |
||
| 2146 | //////////////////////////////////////////////////////////////////////////////// |
||
| 2147 | procedure TTargetCLSIDClipboardFormat.Clear; |
||
| 2148 | begin |
||
| 2149 | FCLSID := GUID_NULL; |
||
| 2150 | end; |
||
| 2151 | |||
| 2152 | var |
||
| 2153 | CF_TargetCLSID: TClipFormat = 0; |
||
| 2154 | |||
| 2155 | function TTargetCLSIDClipboardFormat.GetClipboardFormat: TClipFormat; |
||
| 2156 | begin |
||
| 2157 | if (CF_TargetCLSID = 0) then |
||
| 2158 | CF_TargetCLSID := RegisterClipboardFormat('TargetCLSID'); // *** DO NOT LOCALIZE *** |
||
| 2159 | Result := CF_TargetCLSID; |
||
| 2160 | end; |
||
| 2161 | |||
| 2162 | function TTargetCLSIDClipboardFormat.GetSize: integer; |
||
| 2163 | begin |
||
| 2164 | Result := SizeOf(TCLSID); |
||
| 2165 | end; |
||
| 2166 | |||
| 2167 | function TTargetCLSIDClipboardFormat.HasData: boolean; |
||
| 2168 | begin |
||
| 2169 | Result := not IsEqualCLSID(FCLSID, GUID_NULL); |
||
| 2170 | end; |
||
| 2171 | |||
| 2172 | function TTargetCLSIDClipboardFormat.ReadData(Value: pointer; |
||
| 2173 | Size: integer): boolean; |
||
| 2174 | begin |
||
| 2175 | // Validate size. |
||
| 2176 | Result := (Size = SizeOf(TCLSID)); |
||
| 2177 | if (Result) then |
||
| 2178 | FCLSID := PCLSID(Value)^; |
||
| 2179 | end; |
||
| 2180 | |||
| 2181 | function TTargetCLSIDClipboardFormat.WriteData(Value: pointer; |
||
| 2182 | Size: integer): boolean; |
||
| 2183 | begin |
||
| 2184 | // Validate size. |
||
| 2185 | Result := (Size = SizeOf(TCLSID)); |
||
| 2186 | if (Result) then |
||
| 2187 | PCLSID(Value)^ := FCLSID; |
||
| 2188 | end; |
||
| 2189 | |||
| 2190 | //////////////////////////////////////////////////////////////////////////////// |
||
| 2191 | //////////////////////////////////////////////////////////////////////////////// |
||
| 2192 | //////////////////////////////////////////////////////////////////////////////// |
||
| 2193 | |||
| 2194 | |||
| 2195 | //////////////////////////////////////////////////////////////////////////////// |
||
| 2196 | // |
||
| 2197 | // TTextDataFormat |
||
| 2198 | // |
||
| 2199 | //////////////////////////////////////////////////////////////////////////////// |
||
| 2200 | function TTextDataFormat.Assign(Source: TClipboardFormat): boolean; |
||
| 2201 | begin |
||
| 2202 | Result := True; |
||
| 2203 | |||
| 2204 | if (Source is TTextClipboardFormat) then |
||
| 2205 | FText := TTextClipboardFormat(Source).Text |
||
| 2206 | else if (Source is TFileContentsClipboardFormat) then |
||
| 2207 | FText := TFileContentsClipboardFormat(Source).Data |
||
| 2208 | else |
||
| 2209 | Result := inherited Assign(Source); |
||
| 2210 | end; |
||
| 2211 | |||
| 2212 | function TTextDataFormat.AssignTo(Dest: TClipboardFormat): boolean; |
||
| 2213 | var |
||
| 2214 | FGD: TFileGroupDescriptor; |
||
| 2215 | FGDW: TFileGroupDescriptorW; |
||
| 2216 | resourcestring |
||
| 2217 | // Name of the text scrap file. |
||
| 2218 | sTextScrap = 'Text scrap.txt'; |
||
| 2219 | begin |
||
| 2220 | Result := True; |
||
| 2221 | |||
| 2222 | if (Dest is TTextClipboardFormat) then |
||
| 2223 | TTextClipboardFormat(Dest).Text := FText |
||
| 2224 | else if (Dest is TFileContentsClipboardFormat) then |
||
| 2225 | TFileContentsClipboardFormat(Dest).Data := FText |
||
| 2226 | else if (Dest is TFileGroupDescritorClipboardFormat) then |
||
| 2227 | begin |
||
| 2228 | FillChar(FGD, SizeOf(FGD), 0); |
||
| 2229 | FGD.cItems := 1; |
||
| 2230 | StrPLCopy(FGD.fgd[0].cFileName, sTextScrap, SizeOf(FGD.fgd[0].cFileName)); |
||
| 2231 | TFileGroupDescritorClipboardFormat(Dest).CopyFrom(@FGD); |
||
| 2232 | end else |
||
| 2233 | if (Dest is TFileGroupDescritorWClipboardFormat) then |
||
| 2234 | begin |
||
| 2235 | FillChar(FGDW, SizeOf(FGDW), 0); |
||
| 2236 | FGDW.cItems := 1; |
||
| 2237 | StringToWideChar(sTextScrap, PWideChar(@(FGDW.fgd[0].cFileName)), MAX_PATH); |
||
| 2238 | TFileGroupDescritorWClipboardFormat(Dest).CopyFrom(@FGDW); |
||
| 2239 | end else |
||
| 2240 | Result := inherited AssignTo(Dest); |
||
| 2241 | end; |
||
| 2242 | |||
| 2243 | procedure TTextDataFormat.Clear; |
||
| 2244 | begin |
||
| 2245 | Changing; |
||
| 2246 | FText := ''; |
||
| 2247 | end; |
||
| 2248 | |||
| 2249 | procedure TTextDataFormat.SetText(const Value: string); |
||
| 2250 | begin |
||
| 2251 | Changing; |
||
| 2252 | FText := Value; |
||
| 2253 | end; |
||
| 2254 | |||
| 2255 | function TTextDataFormat.HasData: boolean; |
||
| 2256 | begin |
||
| 2257 | Result := (FText <> ''); |
||
| 2258 | end; |
||
| 2259 | |||
| 2260 | function TTextDataFormat.NeedsData: boolean; |
||
| 2261 | begin |
||
| 2262 | Result := (FText = ''); |
||
| 2263 | end; |
||
| 2264 | |||
| 2265 | |||
| 2266 | //////////////////////////////////////////////////////////////////////////////// |
||
| 2267 | // |
||
| 2268 | // TDataStreamDataFormat |
||
| 2269 | // |
||
| 2270 | //////////////////////////////////////////////////////////////////////////////// |
||
| 2271 | constructor TDataStreamDataFormat.Create(AOwner: TDragDropComponent); |
||
| 2272 | begin |
||
| 2273 | inherited Create(AOwner); |
||
| 2274 | FStreams := TStreamList.Create; |
||
| 2275 | FStreams.OnChanging := DoOnChanging; |
||
| 2276 | end; |
||
| 2277 | |||
| 2278 | destructor TDataStreamDataFormat.Destroy; |
||
| 2279 | begin |
||
| 2280 | Clear; |
||
| 2281 | FStreams.Free; |
||
| 2282 | inherited Destroy; |
||
| 2283 | end; |
||
| 2284 | |||
| 2285 | procedure TDataStreamDataFormat.Clear; |
||
| 2286 | begin |
||
| 2287 | Changing; |
||
| 2288 | FStreams.Clear; |
||
| 2289 | end; |
||
| 2290 | |||
| 2291 | function TDataStreamDataFormat.HasData: boolean; |
||
| 2292 | begin |
||
| 2293 | Result := (Streams.Count > 0); |
||
| 2294 | end; |
||
| 2295 | |||
| 2296 | function TDataStreamDataFormat.NeedsData: boolean; |
||
| 2297 | begin |
||
| 2298 | Result := (Streams.Count = 0); |
||
| 2299 | end; |
||
| 2300 | |||
| 2301 | |||
| 2302 | //////////////////////////////////////////////////////////////////////////////// |
||
| 2303 | // |
||
| 2304 | // TFileDescriptorToFilenameStrings |
||
| 2305 | // |
||
| 2306 | //////////////////////////////////////////////////////////////////////////////// |
||
| 2307 | // Used internally to convert between FileDescriptors and filenames on-demand. |
||
| 2308 | //////////////////////////////////////////////////////////////////////////////// |
||
| 2309 | type |
||
| 2310 | TFileDescriptorToFilenameStrings = class(TStrings) |
||
| 2311 | private |
||
| 2312 | FFileDescriptors: TMemoryList; |
||
| 2313 | protected |
||
| 2314 | function Get(Index: Integer): string; override; |
||
| 2315 | function GetCount: Integer; override; |
||
| 2316 | public |
||
| 2317 | constructor Create(AFileDescriptors: TMemoryList); |
||
| 2318 | procedure Clear; override; |
||
| 2319 | procedure Delete(Index: Integer); override; |
||
| 2320 | procedure Insert(Index: Integer; const S: string); override; |
||
| 2321 | procedure Assign(Source: TPersistent); override; |
||
| 2322 | end; |
||
| 2323 | |||
| 2324 | constructor TFileDescriptorToFilenameStrings.Create(AFileDescriptors: TMemoryList); |
||
| 2325 | begin |
||
| 2326 | inherited Create; |
||
| 2327 | FFileDescriptors := AFileDescriptors; |
||
| 2328 | end; |
||
| 2329 | |||
| 2330 | function TFileDescriptorToFilenameStrings.Get(Index: Integer): string; |
||
| 2331 | begin |
||
| 2332 | Result := PFileDescriptor(FFileDescriptors[Index]).cFileName; |
||
| 2333 | end; |
||
| 2334 | |||
| 2335 | function TFileDescriptorToFilenameStrings.GetCount: Integer; |
||
| 2336 | begin |
||
| 2337 | Result := FFileDescriptors.Count; |
||
| 2338 | end; |
||
| 2339 | |||
| 2340 | procedure TFileDescriptorToFilenameStrings.Assign(Source: TPersistent); |
||
| 2341 | var |
||
| 2342 | i: integer; |
||
| 2343 | begin |
||
| 2344 | if Source is TStrings then |
||
| 2345 | begin |
||
| 2346 | BeginUpdate; |
||
| 2347 | try |
||
| 2348 | FFileDescriptors.Clear; |
||
| 2349 | for i := 0 to TStrings(Source).Count-1 do |
||
| 2350 | Add(TStrings(Source)[i]); |
||
| 2351 | finally |
||
| 2352 | EndUpdate; |
||
| 2353 | end; |
||
| 2354 | end else |
||
| 2355 | inherited Assign(Source); |
||
| 2356 | end; |
||
| 2357 | |||
| 2358 | procedure TFileDescriptorToFilenameStrings.Clear; |
||
| 2359 | begin |
||
| 2360 | FFileDescriptors.Clear; |
||
| 2361 | end; |
||
| 2362 | |||
| 2363 | procedure TFileDescriptorToFilenameStrings.Delete(Index: Integer); |
||
| 2364 | begin |
||
| 2365 | FFileDescriptors.Delete(Index); |
||
| 2366 | end; |
||
| 2367 | |||
| 2368 | procedure TFileDescriptorToFilenameStrings.Insert(Index: Integer; const S: string); |
||
| 2369 | var |
||
| 2370 | FD: PFileDescriptor; |
||
| 2371 | begin |
||
| 2372 | if (Index = FFileDescriptors.Count) then |
||
| 2373 | begin |
||
| 2374 | GetMem(FD, SizeOf(TFileDescriptor)); |
||
| 2375 | try |
||
| 2376 | FillChar(FD^, SizeOf(TFileDescriptor), 0); |
||
| 2377 | StrPLCopy(FD.cFileName, S, SizeOf(FD.cFileName)); |
||
| 2378 | FFileDescriptors.Add(FD); |
||
| 2379 | except |
||
| 2380 | FreeMem(FD); |
||
| 2381 | raise; |
||
| 2382 | end; |
||
| 2383 | end; |
||
| 2384 | end; |
||
| 2385 | |||
| 2386 | //////////////////////////////////////////////////////////////////////////////// |
||
| 2387 | // |
||
| 2388 | // TVirtualFileStreamDataFormat |
||
| 2389 | // |
||
| 2390 | //////////////////////////////////////////////////////////////////////////////// |
||
| 2391 | constructor TVirtualFileStreamDataFormat.Create(AOwner: TDragDropComponent); |
||
| 2392 | begin |
||
| 2393 | inherited Create(AOwner); |
||
| 2394 | FFileDescriptors := TMemoryList.Create; |
||
| 2395 | FFileNames := TFileDescriptorToFilenameStrings.Create(FFileDescriptors); |
||
| 2396 | |||
| 2397 | // Add the "file group descriptor" and "file contents" clipboard formats to |
||
| 2398 | // the data format's list of compatible formats. |
||
| 2399 | // Note: This is normally done via TCustomDataFormat.RegisterCompatibleFormat, |
||
| 2400 | // but since this data format and the clipboard format class are specialized |
||
| 2401 | // to be used with each other, it is just as easy for us to add the formats |
||
| 2402 | // manually. |
||
| 2403 | FFileContentsClipboardFormat := TFileContentsStreamOnDemandClipboardFormat.Create; |
||
| 2404 | CompatibleFormats.Add(FFileContentsClipboardFormat); |
||
| 2405 | |||
| 2406 | FFileGroupDescritorClipboardFormat := TFileGroupDescritorClipboardFormat.Create; |
||
| 2407 | |||
| 2408 | // Normaly TFileGroupDescritorClipboardFormat supports both HGlobal and |
||
| 2409 | // IStream storage medium transfers, but for this demo we only use IStream. |
||
| 2410 | // FFileGroupDescritorClipboardFormat.FormatEtc.tymed := TYMED_ISTREAM; |
||
| 2411 | |||
| 2412 | CompatibleFormats.Add(FFileGroupDescritorClipboardFormat); |
||
| 2413 | end; |
||
| 2414 | |||
| 2415 | destructor TVirtualFileStreamDataFormat.Destroy; |
||
| 2416 | begin |
||
| 2417 | FFileDescriptors.Free; |
||
| 2418 | FFileNames.Free; |
||
| 2419 | inherited Destroy; |
||
| 2420 | end; |
||
| 2421 | |||
| 2422 | procedure TVirtualFileStreamDataFormat.SetFileNames(const Value: TStrings); |
||
| 2423 | begin |
||
| 2424 | FFileNames.Assign(Value); |
||
| 2425 | end; |
||
| 2426 | |||
| 2427 | {$IFOPT R+} |
||
| 2428 | {$DEFINE R_PLUS} |
||
| 2429 | {$RANGECHECKS OFF} |
||
| 2430 | {$ENDIF} |
||
| 2431 | function TVirtualFileStreamDataFormat.Assign(Source: TClipboardFormat): boolean; |
||
| 2432 | var |
||
| 2433 | i: integer; |
||
| 2434 | FD: PFileDescriptor; |
||
| 2435 | begin |
||
| 2436 | Result := True; |
||
| 2437 | |||
| 2438 | (* |
||
| 2439 | ** TFileContentsStreamOnDemandClipboardFormat |
||
| 2440 | *) |
||
| 2441 | if (Source is TFileContentsStreamOnDemandClipboardFormat) then |
||
| 2442 | begin |
||
| 2443 | FHasContents := TFileContentsStreamOnDemandClipboardFormat(Source).HasData; |
||
| 2444 | end else |
||
| 2445 | (* |
||
| 2446 | ** TFileGroupDescritorClipboardFormat |
||
| 2447 | *) |
||
| 2448 | if (Source is TFileGroupDescritorClipboardFormat) then |
||
| 2449 | begin |
||
| 2450 | FFileDescriptors.Clear; |
||
| 2451 | for i := 0 to TFileGroupDescritorClipboardFormat(Source).FileGroupDescriptor^.cItems-1 do |
||
| 2452 | begin |
||
| 2453 | GetMem(FD, SizeOf(TFileDescriptor)); |
||
| 2454 | try |
||
| 2455 | Move(TFileGroupDescritorClipboardFormat(Source).FileGroupDescriptor^.fgd[i], |
||
| 2456 | FD^, SizeOf(TFileDescriptor)); |
||
| 2457 | FFileDescriptors.Add(FD); |
||
| 2458 | except |
||
| 2459 | FreeMem(FD); |
||
| 2460 | raise; |
||
| 2461 | end; |
||
| 2462 | end; |
||
| 2463 | end else |
||
| 2464 | (* |
||
| 2465 | ** None of the above... |
||
| 2466 | *) |
||
| 2467 | Result := inherited Assign(Source); |
||
| 2468 | end; |
||
| 2469 | {$IFDEF R_PLUS} |
||
| 2470 | {$RANGECHECKS ON} |
||
| 2471 | {$UNDEF R_PLUS} |
||
| 2472 | {$ENDIF} |
||
| 2473 | |||
| 2474 | {$IFOPT R+} |
||
| 2475 | {$DEFINE R_PLUS} |
||
| 2476 | {$RANGECHECKS OFF} |
||
| 2477 | {$ENDIF} |
||
| 2478 | function TVirtualFileStreamDataFormat.AssignTo(Dest: TClipboardFormat): boolean; |
||
| 2479 | var |
||
| 2480 | FGD: PFileGroupDescriptor; |
||
| 2481 | i: integer; |
||
| 2482 | begin |
||
| 2483 | (* |
||
| 2484 | ** TFileContentsStreamOnDemandClipboardFormat |
||
| 2485 | *) |
||
| 2486 | if (Dest is TFileContentsStreamOnDemandClipboardFormat) then |
||
| 2487 | begin |
||
| 2488 | // Let the clipboard format handle the transfer. |
||
| 2489 | // No data is actually transferred, but TFileContentsStreamOnDemandClipboardFormat |
||
| 2490 | // needs to set a flag when data is requested. |
||
| 2491 | Result := Dest.Assign(Self); |
||
| 2492 | end else |
||
| 2493 | (* |
||
| 2494 | ** TFileGroupDescritorClipboardFormat |
||
| 2495 | *) |
||
| 2496 | if (Dest is TFileGroupDescritorClipboardFormat) then |
||
| 2497 | begin |
||
| 2498 | if (FFileDescriptors.Count > 0) then |
||
| 2499 | begin |
||
| 2500 | GetMem(FGD, SizeOf(UINT) + FFileDescriptors.Count * SizeOf(TFileDescriptor)); |
||
| 2501 | try |
||
| 2502 | FGD.cItems := FFileDescriptors.Count; |
||
| 2503 | for i := 0 to FFileDescriptors.Count-1 do |
||
| 2504 | Move(FFileDescriptors[i]^, FGD.fgd[i], SizeOf(TFileDescriptor)); |
||
| 2505 | |||
| 2506 | TFileGroupDescritorClipboardFormat(Dest).CopyFrom(FGD); |
||
| 2507 | finally |
||
| 2508 | FreeMem(FGD); |
||
| 2509 | end; |
||
| 2510 | Result := True; |
||
| 2511 | end else |
||
| 2512 | Result := False; |
||
| 2513 | end else |
||
| 2514 | (* |
||
| 2515 | ** None of the above... |
||
| 2516 | *) |
||
| 2517 | Result := inherited AssignTo(Dest); |
||
| 2518 | end; |
||
| 2519 | {$IFDEF R_PLUS} |
||
| 2520 | {$RANGECHECKS ON} |
||
| 2521 | {$UNDEF R_PLUS} |
||
| 2522 | {$ENDIF} |
||
| 2523 | |||
| 2524 | procedure TVirtualFileStreamDataFormat.Clear; |
||
| 2525 | begin |
||
| 2526 | FFileDescriptors.Clear; |
||
| 2527 | FHasContents := False; |
||
| 2528 | end; |
||
| 2529 | |||
| 2530 | function TVirtualFileStreamDataFormat.HasData: boolean; |
||
| 2531 | begin |
||
| 2532 | Result := (FFileDescriptors.Count > 0) and |
||
| 2533 | ((FHasContents) or Assigned(FFileContentsClipboardFormat.OnGetStream)); |
||
| 2534 | end; |
||
| 2535 | |||
| 2536 | function TVirtualFileStreamDataFormat.NeedsData: boolean; |
||
| 2537 | begin |
||
| 2538 | Result := (FFileDescriptors.Count = 0) or (not FHasContents); |
||
| 2539 | end; |
||
| 2540 | |||
| 2541 | function TVirtualFileStreamDataFormat.GetOnGetStream: TOnGetStreamEvent; |
||
| 2542 | begin |
||
| 2543 | Result := FFileContentsClipboardFormat.OnGetStream; |
||
| 2544 | end; |
||
| 2545 | |||
| 2546 | procedure TVirtualFileStreamDataFormat.SetOnGetStream(const Value: TOnGetStreamEvent); |
||
| 2547 | begin |
||
| 2548 | FFileContentsClipboardFormat.OnGetStream := Value; |
||
| 2549 | end; |
||
| 2550 | |||
| 2551 | |||
| 2552 | //////////////////////////////////////////////////////////////////////////////// |
||
| 2553 | // |
||
| 2554 | // TFeedbackDataFormat |
||
| 2555 | // |
||
| 2556 | //////////////////////////////////////////////////////////////////////////////// |
||
| 2557 | function TFeedbackDataFormat.Assign(Source: TClipboardFormat): boolean; |
||
| 2558 | begin |
||
| 2559 | Result := True; |
||
| 2560 | |||
| 2561 | if (Source is TPreferredDropEffectClipboardFormat) then |
||
| 2562 | FPreferredDropEffect := TPreferredDropEffectClipboardFormat(Source).Value |
||
| 2563 | |||
| 2564 | else if (Source is TPerformedDropEffectClipboardFormat) then |
||
| 2565 | FPerformedDropEffect := TPerformedDropEffectClipboardFormat(Source).Value |
||
| 2566 | |||
| 2567 | else if (Source is TLogicalPerformedDropEffectClipboardFormat) then |
||
| 2568 | FLogicalPerformedDropEffect := TLogicalPerformedDropEffectClipboardFormat(Source).Value |
||
| 2569 | |||
| 2570 | else if (Source is TPasteSuccededClipboardFormat) then |
||
| 2571 | FPasteSucceded := TPasteSuccededClipboardFormat(Source).Value |
||
| 2572 | |||
| 2573 | else if (Source is TTargetCLSIDClipboardFormat) then |
||
| 2574 | FTargetCLSID := TTargetCLSIDClipboardFormat(Source).CLSID |
||
| 2575 | |||
| 2576 | else if (Source is TInShellDragLoopClipboardFormat) then |
||
| 2577 | begin |
||
| 2578 | FInShellDragLoop := TInShellDragLoopClipboardFormat(Source).InShellDragLoop; |
||
| 2579 | FGotInShellDragLoop := True; |
||
| 2580 | end else |
||
| 2581 | Result := inherited Assign(Source); |
||
| 2582 | end; |
||
| 2583 | |||
| 2584 | function TFeedbackDataFormat.AssignTo(Dest: TClipboardFormat): boolean; |
||
| 2585 | begin |
||
| 2586 | Result := True; |
||
| 2587 | |||
| 2588 | if (Dest is TPreferredDropEffectClipboardFormat) then |
||
| 2589 | TPreferredDropEffectClipboardFormat(Dest).Value := FPreferredDropEffect |
||
| 2590 | |||
| 2591 | else if (Dest is TPerformedDropEffectClipboardFormat) then |
||
| 2592 | TPerformedDropEffectClipboardFormat(Dest).Value := FPerformedDropEffect |
||
| 2593 | |||
| 2594 | else if (Dest is TLogicalPerformedDropEffectClipboardFormat) then |
||
| 2595 | TLogicalPerformedDropEffectClipboardFormat(Dest).Value := FLogicalPerformedDropEffect |
||
| 2596 | |||
| 2597 | else if (Dest is TPasteSuccededClipboardFormat) then |
||
| 2598 | TPasteSuccededClipboardFormat(Dest).Value := FPasteSucceded |
||
| 2599 | |||
| 2600 | else if (Dest is TTargetCLSIDClipboardFormat) then |
||
| 2601 | TTargetCLSIDClipboardFormat(Dest).CLSID := FTargetCLSID |
||
| 2602 | |||
| 2603 | else if (Dest is TInShellDragLoopClipboardFormat) then |
||
| 2604 | TInShellDragLoopClipboardFormat(Dest).InShellDragLoop := FInShellDragLoop |
||
| 2605 | |||
| 2606 | else |
||
| 2607 | Result := inherited AssignTo(Dest); |
||
| 2608 | end; |
||
| 2609 | |||
| 2610 | procedure TFeedbackDataFormat.Clear; |
||
| 2611 | begin |
||
| 2612 | Changing; |
||
| 2613 | FPreferredDropEffect := DROPEFFECT_NONE; |
||
| 2614 | FPerformedDropEffect := DROPEFFECT_NONE; |
||
| 2615 | FInShellDragLoop := False; |
||
| 2616 | FGotInShellDragLoop := False; |
||
| 2617 | end; |
||
| 2618 | |||
| 2619 | procedure TFeedbackDataFormat.SetInShellDragLoop(const Value: boolean); |
||
| 2620 | begin |
||
| 2621 | Changing; |
||
| 2622 | FInShellDragLoop := Value; |
||
| 2623 | end; |
||
| 2624 | |||
| 2625 | procedure TFeedbackDataFormat.SetPasteSucceded(const Value: longInt); |
||
| 2626 | begin |
||
| 2627 | Changing; |
||
| 2628 | FPasteSucceded := Value; |
||
| 2629 | end; |
||
| 2630 | |||
| 2631 | procedure TFeedbackDataFormat.SetPerformedDropEffect( |
||
| 2632 | const Value: longInt); |
||
| 2633 | begin |
||
| 2634 | Changing; |
||
| 2635 | FPerformedDropEffect := Value; |
||
| 2636 | end; |
||
| 2637 | |||
| 2638 | procedure TFeedbackDataFormat.SetLogicalPerformedDropEffect( |
||
| 2639 | const Value: longInt); |
||
| 2640 | begin |
||
| 2641 | Changing; |
||
| 2642 | FLogicalPerformedDropEffect := Value; |
||
| 2643 | end; |
||
| 2644 | |||
| 2645 | procedure TFeedbackDataFormat.SetPreferredDropEffect( |
||
| 2646 | const Value: longInt); |
||
| 2647 | begin |
||
| 2648 | Changing; |
||
| 2649 | FPreferredDropEffect := Value; |
||
| 2650 | end; |
||
| 2651 | |||
| 2652 | procedure TFeedbackDataFormat.SetTargetCLSID(const Value: TCLSID); |
||
| 2653 | begin |
||
| 2654 | Changing; |
||
| 2655 | FTargetCLSID := Value; |
||
| 2656 | end; |
||
| 2657 | |||
| 2658 | function TFeedbackDataFormat.HasData: boolean; |
||
| 2659 | begin |
||
| 2660 | Result := (FPreferredDropEffect <> DROPEFFECT_NONE) or |
||
| 2661 | (FPerformedDropEffect <> DROPEFFECT_NONE) or |
||
| 2662 | (FPasteSucceded <> DROPEFFECT_NONE) or |
||
| 2663 | (FGotInShellDragLoop); |
||
| 2664 | end; |
||
| 2665 | |||
| 2666 | function TFeedbackDataFormat.NeedsData: boolean; |
||
| 2667 | begin |
||
| 2668 | Result := (FPreferredDropEffect = DROPEFFECT_NONE) or |
||
| 2669 | (FPerformedDropEffect = DROPEFFECT_NONE) or |
||
| 2670 | (FPasteSucceded = DROPEFFECT_NONE) or |
||
| 2671 | (not FGotInShellDragLoop); |
||
| 2672 | end; |
||
| 2673 | |||
| 2674 | |||
| 2675 | //////////////////////////////////////////////////////////////////////////////// |
||
| 2676 | // |
||
| 2677 | // TGenericClipboardFormat |
||
| 2678 | // |
||
| 2679 | //////////////////////////////////////////////////////////////////////////////// |
||
| 2680 | procedure TGenericClipboardFormat.SetClipboardFormatName(const Value: string); |
||
| 2681 | begin |
||
| 2682 | FFormat := Value; |
||
| 2683 | if (FFormat <> '') then |
||
| 2684 | ClipboardFormat := RegisterClipboardFormat(PChar(FFormat)); |
||
| 2685 | end; |
||
| 2686 | |||
| 2687 | function TGenericClipboardFormat.GetClipboardFormat: TClipFormat; |
||
| 2688 | begin |
||
| 2689 | if (FFormatEtc.cfFormat = 0) and (FFormat <> '') then |
||
| 2690 | FFormatEtc.cfFormat := RegisterClipboardFormat(PChar(FFormat)); |
||
| 2691 | Result := FFormatEtc.cfFormat; |
||
| 2692 | end; |
||
| 2693 | |||
| 2694 | function TGenericClipboardFormat.GetClipboardFormatName: string; |
||
| 2695 | begin |
||
| 2696 | Result := FFormat; |
||
| 2697 | end; |
||
| 2698 | |||
| 2699 | function TGenericClipboardFormat.Assign(Source: TCustomDataFormat): boolean; |
||
| 2700 | begin |
||
| 2701 | if (Source is TGenericDataFormat) then |
||
| 2702 | begin |
||
| 2703 | Data := TGenericDataFormat(Source).Data; |
||
| 2704 | Result := True; |
||
| 2705 | end else |
||
| 2706 | Result := inherited Assign(Source); |
||
| 2707 | end; |
||
| 2708 | |||
| 2709 | function TGenericClipboardFormat.AssignTo(Dest: TCustomDataFormat): boolean; |
||
| 2710 | begin |
||
| 2711 | if (Dest is TGenericDataFormat) then |
||
| 2712 | begin |
||
| 2713 | TGenericDataFormat(Dest).Data := Data; |
||
| 2714 | Result := True; |
||
| 2715 | end else |
||
| 2716 | Result := inherited AssignTo(Dest); |
||
| 2717 | end; |
||
| 2718 | |||
| 2719 | //////////////////////////////////////////////////////////////////////////////// |
||
| 2720 | // |
||
| 2721 | // TGenericDataFormat |
||
| 2722 | // |
||
| 2723 | //////////////////////////////////////////////////////////////////////////////// |
||
| 2724 | procedure TGenericDataFormat.AddFormat(const AFormat: string); |
||
| 2725 | var |
||
| 2726 | ClipboardFormat: TGenericClipboardFormat; |
||
| 2727 | begin |
||
| 2728 | ClipboardFormat := TGenericClipboardFormat.Create; |
||
| 2729 | ClipboardFormat.ClipboardFormatName := AFormat; |
||
| 2730 | ClipboardFormat.DataDirections := [ddRead]; |
||
| 2731 | CompatibleFormats.Add(ClipboardFormat); |
||
| 2732 | end; |
||
| 2733 | |||
| 2734 | procedure TGenericDataFormat.Clear; |
||
| 2735 | begin |
||
| 2736 | Changing; |
||
| 2737 | FData := ''; |
||
| 2738 | end; |
||
| 2739 | |||
| 2740 | function TGenericDataFormat.HasData: boolean; |
||
| 2741 | begin |
||
| 2742 | Result := (FData <> ''); |
||
| 2743 | end; |
||
| 2744 | |||
| 2745 | function TGenericDataFormat.NeedsData: boolean; |
||
| 2746 | begin |
||
| 2747 | Result := (FData = ''); |
||
| 2748 | end; |
||
| 2749 | |||
| 2750 | procedure TGenericDataFormat.DoSetData(const Value: string); |
||
| 2751 | begin |
||
| 2752 | Changing; |
||
| 2753 | FData := Value; |
||
| 2754 | end; |
||
| 2755 | |||
| 2756 | procedure TGenericDataFormat.SetDataHere(const AData; ASize: integer); |
||
| 2757 | begin |
||
| 2758 | Changing; |
||
| 2759 | SetLength(FData, ASize); |
||
| 2760 | Move(AData, PChar(FData)^, ASize); |
||
| 2761 | end; |
||
| 2762 | |||
| 2763 | function TGenericDataFormat.GetSize: integer; |
||
| 2764 | begin |
||
| 2765 | Result := length(FData); |
||
| 2766 | end; |
||
| 2767 | |||
| 2768 | function TGenericDataFormat.GetDataHere(var AData; ASize: integer): integer; |
||
| 2769 | begin |
||
| 2770 | Result := Size; |
||
| 2771 | if (ASize < Result) then |
||
| 2772 | Result := ASize; |
||
| 2773 | Move(PChar(FData)^, AData, Result); |
||
| 2774 | end; |
||
| 2775 | |||
| 2776 | |||
| 2777 | //////////////////////////////////////////////////////////////////////////////// |
||
| 2778 | // |
||
| 2779 | // Initialization/Finalization |
||
| 2780 | // |
||
| 2781 | //////////////////////////////////////////////////////////////////////////////// |
||
| 2782 | |||
| 2783 | initialization |
||
| 2784 | // Data format registration |
||
| 2785 | TTextDataFormat.RegisterDataFormat; |
||
| 2786 | TDataStreamDataFormat.RegisterDataFormat; |
||
| 2787 | TVirtualFileStreamDataFormat.RegisterDataFormat; |
||
| 2788 | |||
| 2789 | // Clipboard format registration |
||
| 2790 | TTextDataFormat.RegisterCompatibleFormat(TTextClipboardFormat, 0, csSourceTarget, [ddRead]); |
||
| 2791 | TTextDataFormat.RegisterCompatibleFormat(TFileContentsClipboardFormat, 1, csSourceTarget, [ddRead]); |
||
| 2792 | TTextDataFormat.RegisterCompatibleFormat(TFileGroupDescritorClipboardFormat, 1, [csSource], [ddRead]); |
||
| 2793 | TTextDataFormat.RegisterCompatibleFormat(TFileGroupDescritorWClipboardFormat, 1, [csSource], [ddRead]); |
||
| 2794 | TFeedbackDataFormat.RegisterCompatibleFormat(TPreferredDropEffectClipboardFormat, 0, csSourceTarget, [ddRead]); |
||
| 2795 | TFeedbackDataFormat.RegisterCompatibleFormat(TPerformedDropEffectClipboardFormat, 0, csSourceTarget, [ddWrite]); |
||
| 2796 | TFeedbackDataFormat.RegisterCompatibleFormat(TPasteSuccededClipboardFormat, 0, csSourceTarget, [ddWrite]); |
||
| 2797 | TFeedbackDataFormat.RegisterCompatibleFormat(TInShellDragLoopClipboardFormat, 0, csSourceTarget, [ddRead]); |
||
| 2798 | TFeedbackDataFormat.RegisterCompatibleFormat(TTargetCLSIDClipboardFormat, 0, csSourceTarget, [ddWrite]); |
||
| 2799 | TFeedbackDataFormat.RegisterCompatibleFormat(TLogicalPerformedDropEffectClipboardFormat, 0, csSourceTarget, [ddWrite]); |
||
| 2800 | TDataStreamDataFormat.RegisterCompatibleFormat(TFileContentsStreamClipboardFormat, 0, [csTarget], [ddRead]); |
||
| 2801 | |||
| 2802 | finalization |
||
| 2803 | TTextDataFormat.UnregisterDataFormat; |
||
| 2804 | TDataStreamDataFormat.UnregisterDataFormat; |
||
| 2805 | TFeedbackDataFormat.UnregisterDataFormat; |
||
| 2806 | TVirtualFileStreamDataFormat.UnregisterDataFormat; |
||
| 2807 | |||
| 2808 | TTextClipboardFormat.UnregisterClipboardFormat; |
||
| 2809 | TFileGroupDescritorClipboardFormat.UnregisterClipboardFormat; |
||
| 2810 | TFileGroupDescritorWClipboardFormat.UnregisterClipboardFormat; |
||
| 2811 | TFileContentsClipboardFormat.UnregisterClipboardFormat; |
||
| 2812 | TFileContentsStreamClipboardFormat.UnregisterClipboardFormat; |
||
| 2813 | TPreferredDropEffectClipboardFormat.UnregisterClipboardFormat; |
||
| 2814 | TPerformedDropEffectClipboardFormat.UnregisterClipboardFormat; |
||
| 2815 | TPasteSuccededClipboardFormat.UnregisterClipboardFormat; |
||
| 2816 | TInShellDragLoopClipboardFormat.UnregisterClipboardFormat; |
||
| 2817 | TTargetCLSIDClipboardFormat.UnregisterClipboardFormat; |
||
| 2818 | TLogicalPerformedDropEffectClipboardFormat.UnregisterClipboardFormat; |
||
| 2819 | |||
| 2820 | end. |
||
| 2821 | |||
| 2822 |