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Rev | Author | Line No. | Line |
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68 | daniel-mar | 1 | unit VTSListView; |
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81 | daniel-mar | 3 | {$WARN UNSAFE_CODE OFF} |
4 | {$WARN UNSAFE_TYPE OFF} |
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5 | |||
68 | daniel-mar | 6 | interface |
7 | |||
8 | // This ListView adds support for sorting arrows |
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9 | |||
10 | // Recommended usage for the OnCompare event: |
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11 | (* |
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12 | procedure TForm1.ListViewCompare(Sender: TObject; Item1, |
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13 | Item2: TListItem; Data: Integer; var Compare: Integer); |
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14 | var |
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15 | ListView: TVTSListView; |
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16 | begin |
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17 | ListView := Sender as TVTSListView; |
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18 | if ListView.CurSortedColumn = 0 then |
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19 | begin |
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20 | Compare := CompareText(Item1.Caption, Item2.Caption); |
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21 | end |
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22 | else |
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23 | begin |
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24 | Compare := CompareText(Item1.SubItems[ListView.CurSortedColumn-1], |
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25 | Item2.SubItems[ListView.CurSortedColumn-1]); |
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26 | end; |
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27 | if ListView.CurSortedDesc then Compare := -Compare; |
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28 | end; |
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29 | *) |
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30 | |||
31 | uses |
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32 | Windows, Messages, SysUtils, Classes, Controls, ComCtrls, CommCtrl; |
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33 | |||
34 | type |
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35 | TVTSListView = class(TListView) |
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36 | private |
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37 | FDescending: Boolean; |
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38 | FSortedColumn: Integer; |
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39 | procedure WMNotifyMessage(var msg: TWMNotify); message WM_NOTIFY; |
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40 | protected |
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41 | procedure ShowArrowOfListViewColumn; |
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42 | procedure ColClick(Column: TListColumn); override; |
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43 | public |
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44 | constructor Create(AOwner: TComponent); override; |
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45 | published |
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46 | property CurSortedColumn: integer read FSortedColumn; |
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47 | property CurSortedDesc: boolean read FDescending; |
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48 | end; |
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49 | |||
50 | procedure Register; |
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51 | |||
52 | implementation |
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53 | |||
54 | // The arrows require a XP Manifest |
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55 | |||
56 | {$IF not Declared(HDF_SORTUP)} |
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57 | const |
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58 | { For Windows >= XP } |
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59 | {$EXTERNALSYM HDF_SORTUP} |
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60 | HDF_SORTUP = $0400; |
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61 | {$EXTERNALSYM HDF_SORTDOWN} |
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62 | HDF_SORTDOWN = $0200; |
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63 | {$IFEND} |
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64 | |||
65 | { TVTSListView } |
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66 | |||
67 | constructor TVTSListView.Create(AOwner: TComponent); |
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68 | begin |
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69 | inherited; |
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70 | FSortedColumn := -1; |
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71 | end; |
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72 | |||
73 | procedure TVTSListView.ShowArrowOfListViewColumn; |
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74 | var |
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75 | Header: HWND; |
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76 | Item: THDItem; |
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77 | i: integer; |
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78 | begin |
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79 | Header := ListView_GetHeader(Handle); |
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80 | ZeroMemory(@Item, SizeOf(Item)); |
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81 | Item.Mask := HDI_FORMAT; |
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82 | |||
83 | // Remove arrows |
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84 | for i := 0 to Columns.Count-1 do |
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85 | begin |
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86 | Header_GetItem(Header, i, Item); |
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87 | Item.fmt := Item.fmt and not (HDF_SORTUP or HDF_SORTDOWN); |
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88 | Header_SetItem(Header, i, Item); |
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89 | end; |
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90 | |||
91 | // Add arrow |
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92 | Header_GetItem(Header, FSortedColumn, Item); |
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93 | if FDescending then |
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94 | Item.fmt := Item.fmt or HDF_SORTDOWN |
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95 | else |
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96 | Item.fmt := Item.fmt or HDF_SORTUP; |
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97 | Header_SetItem(Header, FSortedColumn, Item); |
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98 | end; |
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99 | |||
100 | procedure TVTSListView.WMNotifyMessage(var msg: TWMNotify); |
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101 | begin |
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77 | daniel-mar | 102 | try |
103 | inherited; |
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104 | except |
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105 | // Workaround for Delphi 6, which raises an EAccessViolation in |
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106 | // CallWindowProc at TWinControl.DefaultHandler, when the code executed |
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107 | // on Windows Server 2008. |
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108 | end; |
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68 | daniel-mar | 109 | if (Msg.NMHdr^.code = HDN_ENDTRACK) and (FSortedColumn > -1) then |
110 | begin |
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111 | ShowArrowOfListViewColumn; |
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112 | end; |
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113 | end; |
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114 | |||
115 | procedure TVTSListView.ColClick(Column: TListColumn); |
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116 | begin |
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117 | if not Assigned(OnCompare) then Exit; |
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118 | SortType := stNone; |
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119 | if Column.Index <> FSortedColumn then |
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120 | begin |
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121 | FSortedColumn := Column.Index; |
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122 | FDescending := False; |
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123 | end |
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124 | else |
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125 | begin |
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126 | FDescending := not FDescending; |
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127 | end; |
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128 | ShowArrowOfListViewColumn; |
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129 | SortType := stText; |
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130 | inherited; |
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131 | end; |
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132 | |||
133 | procedure Register; |
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134 | begin |
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135 | RegisterComponents('ViaThinkSoft', [TVTSListView]); |
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136 | end; |
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137 | |||
138 | end. |