Rev 81 | Details | Compare with Previous | Last modification | View Log | RSS feed
Rev | Author | Line No. | Line |
---|---|---|---|
68 | daniel-mar | 1 | unit VTSListView; |
2 | |||
3 | interface |
||
4 | |||
5 | // This ListView adds support for sorting arrows |
||
6 | |||
7 | // Recommended usage for the OnCompare event: |
||
8 | (* |
||
9 | procedure TForm1.ListViewCompare(Sender: TObject; Item1, |
||
10 | Item2: TListItem; Data: Integer; var Compare: Integer); |
||
11 | var |
||
12 | ListView: TVTSListView; |
||
13 | begin |
||
14 | ListView := Sender as TVTSListView; |
||
15 | if ListView.CurSortedColumn = 0 then |
||
16 | begin |
||
17 | Compare := CompareText(Item1.Caption, Item2.Caption); |
||
18 | end |
||
19 | else |
||
20 | begin |
||
21 | Compare := CompareText(Item1.SubItems[ListView.CurSortedColumn-1], |
||
22 | Item2.SubItems[ListView.CurSortedColumn-1]); |
||
23 | end; |
||
24 | if ListView.CurSortedDesc then Compare := -Compare; |
||
25 | end; |
||
26 | *) |
||
27 | |||
28 | uses |
||
29 | Windows, Messages, SysUtils, Classes, Controls, ComCtrls, CommCtrl; |
||
30 | |||
31 | type |
||
32 | TVTSListView = class(TListView) |
||
33 | private |
||
34 | FDescending: Boolean; |
||
35 | FSortedColumn: Integer; |
||
36 | procedure WMNotifyMessage(var msg: TWMNotify); message WM_NOTIFY; |
||
37 | protected |
||
38 | procedure ShowArrowOfListViewColumn; |
||
39 | procedure ColClick(Column: TListColumn); override; |
||
40 | public |
||
41 | constructor Create(AOwner: TComponent); override; |
||
42 | published |
||
43 | property CurSortedColumn: integer read FSortedColumn; |
||
44 | property CurSortedDesc: boolean read FDescending; |
||
45 | end; |
||
46 | |||
47 | procedure Register; |
||
48 | |||
49 | implementation |
||
50 | |||
51 | // The arrows require a XP Manifest |
||
52 | |||
53 | {$IF not Declared(HDF_SORTUP)} |
||
54 | const |
||
55 | { For Windows >= XP } |
||
56 | {$EXTERNALSYM HDF_SORTUP} |
||
57 | HDF_SORTUP = $0400; |
||
58 | {$EXTERNALSYM HDF_SORTDOWN} |
||
59 | HDF_SORTDOWN = $0200; |
||
60 | {$IFEND} |
||
61 | |||
62 | { TVTSListView } |
||
63 | |||
64 | constructor TVTSListView.Create(AOwner: TComponent); |
||
65 | begin |
||
66 | inherited; |
||
67 | FSortedColumn := -1; |
||
68 | end; |
||
69 | |||
70 | procedure TVTSListView.ShowArrowOfListViewColumn; |
||
71 | var |
||
72 | Header: HWND; |
||
73 | Item: THDItem; |
||
74 | i: integer; |
||
75 | begin |
||
76 | Header := ListView_GetHeader(Handle); |
||
77 | ZeroMemory(@Item, SizeOf(Item)); |
||
78 | Item.Mask := HDI_FORMAT; |
||
79 | |||
80 | // Remove arrows |
||
81 | for i := 0 to Columns.Count-1 do |
||
82 | begin |
||
83 | Header_GetItem(Header, i, Item); |
||
84 | Item.fmt := Item.fmt and not (HDF_SORTUP or HDF_SORTDOWN); |
||
85 | Header_SetItem(Header, i, Item); |
||
86 | end; |
||
87 | |||
88 | // Add arrow |
||
89 | Header_GetItem(Header, FSortedColumn, Item); |
||
90 | if FDescending then |
||
91 | Item.fmt := Item.fmt or HDF_SORTDOWN |
||
92 | else |
||
93 | Item.fmt := Item.fmt or HDF_SORTUP; |
||
94 | Header_SetItem(Header, FSortedColumn, Item); |
||
95 | end; |
||
96 | |||
97 | procedure TVTSListView.WMNotifyMessage(var msg: TWMNotify); |
||
98 | begin |
||
77 | daniel-mar | 99 | try |
100 | inherited; |
||
101 | except |
||
102 | // Workaround for Delphi 6, which raises an EAccessViolation in |
||
103 | // CallWindowProc at TWinControl.DefaultHandler, when the code executed |
||
104 | // on Windows Server 2008. |
||
105 | end; |
||
68 | daniel-mar | 106 | if (Msg.NMHdr^.code = HDN_ENDTRACK) and (FSortedColumn > -1) then |
107 | begin |
||
108 | ShowArrowOfListViewColumn; |
||
109 | end; |
||
110 | end; |
||
111 | |||
112 | procedure TVTSListView.ColClick(Column: TListColumn); |
||
113 | begin |
||
114 | if not Assigned(OnCompare) then Exit; |
||
115 | SortType := stNone; |
||
116 | if Column.Index <> FSortedColumn then |
||
117 | begin |
||
118 | FSortedColumn := Column.Index; |
||
119 | FDescending := False; |
||
120 | end |
||
121 | else |
||
122 | begin |
||
123 | FDescending := not FDescending; |
||
124 | end; |
||
125 | ShowArrowOfListViewColumn; |
||
126 | SortType := stText; |
||
127 | inherited; |
||
128 | end; |
||
129 | |||
130 | procedure Register; |
||
131 | begin |
||
132 | RegisterComponents('ViaThinkSoft', [TVTSListView]); |
||
133 | end; |
||
134 | |||
135 | end. |