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| Rev | Author | Line No. | Line |
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| 2 | daniel-mar | 1 | unit DropHandler; |
| 2 | |||
| 3 | // ----------------------------------------------------------------------------- |
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| 4 | // Project: Drag and Drop Component Suite. |
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| 5 | // Module: DropHandler |
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| 6 | // Description: Implements Drop Handler Shell Extensions. |
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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 | interface |
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| 14 | |||
| 15 | uses |
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| 16 | DragDrop, |
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| 17 | DropTarget, |
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| 18 | DragDropFile, |
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| 19 | DragDropComObj, |
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| 20 | ActiveX, |
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| 21 | Windows, |
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| 22 | Classes; |
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| 23 | |||
| 24 | type |
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| 25 | //////////////////////////////////////////////////////////////////////////////// |
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| 26 | // |
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| 27 | // TDropHandler |
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| 28 | // |
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| 29 | //////////////////////////////////////////////////////////////////////////////// |
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| 30 | // Based on Angus Johnson's DropHandler demo. |
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| 31 | //////////////////////////////////////////////////////////////////////////////// |
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| 32 | // A typical drop handler session goes like this: |
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| 33 | // 1. User drags one or more source files over a target file which has a |
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| 34 | // registered drop handler. |
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| 35 | // 2. The shell loads the drop handler module. |
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| 36 | // 3. The shell instantiates the registered drop handler object as an in-process |
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| 37 | // COM server. |
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| 38 | // 4. The IPersistFile.Load method is called with the name of the target file. |
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| 39 | // The target file name is stored in the TDropHandler.TargetFile property. |
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| 40 | // 5. The IDropTarget.Enter method is called. This causes a TDropHandler.OnEnter |
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| 41 | // event to be fired. |
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| 42 | // 6. One of two things can happen next: |
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| 43 | // a) The user drops the source files on the target file. |
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| 44 | // The IDropTarget.Drop method is called. This causes a |
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| 45 | // TDropHandler.OnDrop event to be fired. |
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| 46 | // The names of the dropped files are stored in the TDropHandler.Files |
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| 47 | // string list property. |
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| 48 | // b) The user drags the source files away from the target file. |
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| 49 | // The IDropTarget.Leave method is called. This causes a |
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| 50 | // TDropHandler.OnLeave event to be fired. |
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| 51 | // 7. The shell unloads the drop handler module (usually after a few seconds). |
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| 52 | //////////////////////////////////////////////////////////////////////////////// |
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| 53 | TDropHandler = class(TDropFileTarget, IPersistFile) |
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| 54 | private |
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| 55 | FTargetFile: string; |
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| 56 | protected |
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| 57 | // IPersistFile implementation |
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| 58 | function GetClassID(out classID: TCLSID): HResult; stdcall; |
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| 59 | function IsDirty: HResult; stdcall; |
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| 60 | function Load(pszFileName: POleStr; dwMode: Longint): HResult; stdcall; |
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| 61 | function Save(pszFileName: POleStr; fRemember: BOOL): HResult; stdcall; |
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| 62 | function SaveCompleted(pszFileName: POleStr): HResult; stdcall; |
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| 63 | function GetCurFile(out pszFileName: POleStr): HResult; stdcall; |
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| 64 | public |
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| 65 | property TargetFile: string read FTargetFile; |
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| 66 | end; |
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| 67 | |||
| 68 | //////////////////////////////////////////////////////////////////////////////// |
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| 69 | // |
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| 70 | // TDropHandlerFactory |
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| 71 | // |
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| 72 | //////////////////////////////////////////////////////////////////////////////// |
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| 73 | // COM Class factory for TDropHandler. |
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| 74 | //////////////////////////////////////////////////////////////////////////////// |
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| 75 | TDropHandlerFactory = class(TShellExtFactory) |
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| 76 | protected |
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| 77 | public |
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| 78 | procedure UpdateRegistry(Register: Boolean); override; |
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| 79 | end; |
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| 80 | |||
| 81 | //////////////////////////////////////////////////////////////////////////////// |
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| 82 | // |
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| 83 | // Component registration |
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| 84 | // |
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| 85 | //////////////////////////////////////////////////////////////////////////////// |
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| 86 | procedure Register; |
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| 87 | |||
| 88 | |||
| 89 | //////////////////////////////////////////////////////////////////////////////// |
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| 90 | // |
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| 91 | // Misc. |
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| 92 | // |
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| 93 | //////////////////////////////////////////////////////////////////////////////// |
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| 94 | |||
| 95 | |||
| 96 | //////////////////////////////////////////////////////////////////////////////// |
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| 97 | //////////////////////////////////////////////////////////////////////////////// |
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| 98 | // |
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| 99 | // IMPLEMENTATION |
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| 100 | // |
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| 101 | //////////////////////////////////////////////////////////////////////////////// |
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| 102 | //////////////////////////////////////////////////////////////////////////////// |
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| 103 | implementation |
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| 104 | |||
| 105 | uses |
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| 106 | ComObj; |
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| 107 | |||
| 108 | //////////////////////////////////////////////////////////////////////////////// |
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| 109 | // |
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| 110 | // Component registration |
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| 111 | // |
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| 112 | //////////////////////////////////////////////////////////////////////////////// |
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| 113 | |||
| 114 | procedure Register; |
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| 115 | begin |
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| 116 | RegisterComponents(DragDropComponentPalettePage, [TDropHandler]); |
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| 117 | end; |
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| 118 | |||
| 119 | |||
| 120 | //////////////////////////////////////////////////////////////////////////////// |
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| 121 | // |
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| 122 | // Utilities |
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| 123 | // |
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| 124 | //////////////////////////////////////////////////////////////////////////////// |
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| 125 | |||
| 126 | |||
| 127 | //////////////////////////////////////////////////////////////////////////////// |
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| 128 | // |
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| 129 | // TDropHandler |
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| 130 | // |
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| 131 | //////////////////////////////////////////////////////////////////////////////// |
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| 132 | function TDropHandler.GetClassID(out classID: TCLSID): HResult; |
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| 133 | begin |
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| 134 | result := E_NOTIMPL; |
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| 135 | end; |
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| 136 | |||
| 137 | function TDropHandler.GetCurFile(out pszFileName: POleStr): HResult; |
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| 138 | begin |
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| 139 | result := E_NOTIMPL; |
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| 140 | end; |
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| 141 | |||
| 142 | function TDropHandler.IsDirty: HResult; |
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| 143 | begin |
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| 144 | result := S_FALSE; |
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| 145 | end; |
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| 146 | |||
| 147 | function TDropHandler.Load(pszFileName: POleStr; dwMode: Integer): HResult; |
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| 148 | begin |
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| 149 | FTargetFile := WideCharToString(pszFileName); |
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| 150 | result := S_OK; |
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| 151 | end; |
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| 152 | |||
| 153 | function TDropHandler.Save(pszFileName: POleStr; fRemember: BOOL): HResult; |
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| 154 | begin |
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| 155 | result := E_NOTIMPL; |
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| 156 | end; |
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| 157 | |||
| 158 | function TDropHandler.SaveCompleted(pszFileName: POleStr): HResult; |
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| 159 | begin |
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| 160 | result := E_NOTIMPL; |
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| 161 | end; |
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| 162 | |||
| 163 | |||
| 164 | //////////////////////////////////////////////////////////////////////////////// |
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| 165 | // |
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| 166 | // TDropHandlerFactory |
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| 167 | // |
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| 168 | //////////////////////////////////////////////////////////////////////////////// |
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| 169 | procedure TDropHandlerFactory.UpdateRegistry(Register: Boolean); |
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| 170 | begin |
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| 171 | if Register then |
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| 172 | begin |
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| 173 | inherited UpdateRegistry(Register); |
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| 174 | CreateRegKey(FileClass+'\shellex\DropHandler', '', GUIDToString(ClassID)); |
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| 175 | end else |
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| 176 | begin |
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| 177 | RegDeleteKey(HKEY_CLASSES_ROOT, PChar(FileClass)); |
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| 178 | inherited UpdateRegistry(Register); |
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| 179 | end; |
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| 180 | end; |
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| 181 | |||
| 182 | end. |