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unit WindowsXPStyleDemo;
{$MODE Delphi}
// Virtual Treeview sample form demonstrating following features:
// - Windows XP style treeview.
// Written by Mike Lischke.
interface
uses
LCLIntf, SysUtils, Classes, Graphics, Controls, Forms,
Dialogs, ComCtrls, Laz.VirtualTrees, Menus, StdCtrls,
LResources, Printers, PrintersDlgs, ExtCtrls;
type
{ TWindowsXPForm }
TWindowsXPForm = class(TForm)
ToolBar2: TToolBar;
ToolButton10: TToolButton;
ToolButton11: TToolButton;
ToolButton12: TToolButton;
ToolButton13: TToolButton;
ToolButton14: TToolButton;
ToolButton15: TToolButton;
ToolButton16: TToolButton;
ToolButton7: TToolButton;
XPTree: TLazVirtualStringTree;
LargeImages: TImageList;
SmallImages: TImageList;
Label1: TLabel;
Label2: TLabel;
Label4: TLabel;
PrintDialog: TPrintDialog;
procedure XPTreeGetImageIndex(Sender: TBaseVirtualTree; Node: PVirtualNode; Kind: TVTImageKind;
Column: TColumnIndex; var Ghosted: Boolean; var Index: Integer);
procedure FormCreate(Sender: TObject);
procedure XPTreeInitNode(Sender: TBaseVirtualTree; ParentNode, Node: PVirtualNode;
var InitialStates: TVirtualNodeInitStates);
procedure XPTreeInitChildren(Sender: TBaseVirtualTree; Node: PVirtualNode; var ChildCount: Cardinal);
procedure XPTreeGetText(Sender: TBaseVirtualTree; Node: PVirtualNode; Column: TColumnIndex;
TextType: TVSTTextType; var CellText: String);
procedure XPTreeHeaderClick(Sender: TVTHeader; Column: TColumnIndex; Button: TMouseButton; Shift: TShiftState;
X, Y: Integer);
procedure XPTreeCompareNodes(Sender: TBaseVirtualTree; Node1, Node2: PVirtualNode; Column: TColumnIndex;
var Result: Integer);
procedure XPTreeGetHint(Sender: TBaseVirtualTree; Node: PVirtualNode; Column: TColumnIndex;
var LineBreakStyle: TVTTooltipLineBreakStyle; var HintText: String);
procedure Label4Click(Sender: TObject);
procedure ToolButton9Click(Sender: TObject);
procedure XPTreeStateChange(Sender: TBaseVirtualTree; Enter, Leave: TVirtualTreeStates);
end;
var
WindowsXPForm: TWindowsXPForm;
//----------------------------------------------------------------------------------------------------------------------
implementation
{$R *.lfm}
uses
States;
type
PEntry = ^TEntry;
TEntry = record
Caption: String;
Image: Integer;
Size: Int64;
end;
var
TreeEntries: array[0..17] of TEntry = (
(Caption: 'My Computer'; Image: 0; Size: 0),
(Caption: 'Network Places'; Image: 1; Size: 0),
(Caption: 'Recycle Bin'; Image: 2; Size: 0),
(Caption: 'My Documents'; Image: 3; Size: 0),
(Caption: 'My Music'; Image: 4; Size: 0),
(Caption: 'My Pictures'; Image: 5; Size: 0),
(Caption: 'Control Panel'; Image: 6; Size: 0),
(Caption: 'Help'; Image: 7; Size: 0),
(Caption: 'Help Document'; Image: 8; Size: 0),
(Caption: 'User Accounts'; Image: 9; Size: 0),
(Caption: 'Internet'; Image: 10; Size: 0),
(Caption: 'Network Group'; Image: 11; Size: 0),
(Caption: 'Folder'; Image: 12; Size: 0),
(Caption: 'Window'; Image: 13; Size: 0),
(Caption: 'Warning'; Image: 14; Size: 0),
(Caption: 'Information'; Image: 15; Size: 0),
(Caption: 'Critical'; Image: 16; Size: 0),
(Caption: 'Security'; Image: 17; Size: 0)
);
//----------------------------------------------------------------------------------------------------------------------
procedure TWindowsXPForm.XPTreeGetImageIndex(Sender: TBaseVirtualTree; Node: PVirtualNode;
Kind: TVTImageKind; Column: TColumnIndex; var Ghosted: Boolean; var Index: Integer);
var
Data: PEntry;
begin
Data := Sender.GetNodeData(Node);
case Kind of
ikNormal, ikSelected:
if (Column = 0) and (Node.Parent = Sender.RootNode) then
Index := Data.Image;
ikState:
case Column of
0:
if Node.Parent <> Sender.RootNode then
Index := 21;
end;
end;
end;
//----------------------------------------------------------------------------------------------------------------------
procedure TWindowsXPForm.FormCreate(Sender: TObject);
begin
XPTree.NodeDataSize := SizeOf(TEntry);
{$ifdef LCLWin32}
//enable native look under win32
//todo: enable only in winxp
XPTree.TreeOptions.PaintOptions := XPTree.TreeOptions.PaintOptions + [toThemeAware];
{$endif}
end;
//----------------------------------------------------------------------------------------------------------------------
procedure TWindowsXPForm.XPTreeInitNode(Sender: TBaseVirtualTree; ParentNode, Node: PVirtualNode;
var InitialStates: TVirtualNodeInitStates);
var
Data: PEntry;
begin
if ParentNode = nil then
begin
Include(InitialStates, ivsHasChildren);
Data := Sender.GetNodeData(Node);
Data^ := TreeEntries[Node.Index mod 18];
Data.Size := Random(100000);
Node.CheckType := ctCheckBox;
end
else
Node.CheckType := ctRadioButton;
end;
//----------------------------------------------------------------------------------------------------------------------
procedure TWindowsXPForm.XPTreeInitChildren(Sender: TBaseVirtualTree; Node: PVirtualNode;
var ChildCount: Cardinal);
begin
ChildCount := 5;
end;
//----------------------------------------------------------------------------------------------------------------------
procedure TWindowsXPForm.XPTreeGetText(Sender: TBaseVirtualTree; Node: PVirtualNode; Column: TColumnIndex;
TextType: TVSTTextType; var CellText: String);
var
Data: PEntry;
begin
Data := Sender.GetNodeData(Node);
case Column of
0:
if Node.Parent = Sender.RootNode then
CellText := Data.Caption
else
Text := 'More entries';
1:
if Node.Parent = Sender.RootNode then
CellText := FloatToStr(Data.Size / 1000) + ' MB';
2:
if Node.Parent = Sender.RootNode then
CellText := 'System Folder';
end;
end;
//----------------------------------------------------------------------------------------------------------------------
procedure TWindowsXPForm.XPTreeHeaderClick(Sender: TVTHeader; Column: TColumnIndex; Button: TMouseButton;
Shift: TShiftState; X, Y: Integer);
begin
if Button = mbLeft then
begin
with Sender, Treeview do
begin
if SortColumn > NoColumn then
Columns[SortColumn].Options := Columns[SortColumn].Options + [coParentColor];
// Do not sort the last column, it contains nothing to sort.
if Column = 2 then
SortColumn := NoColumn
else
begin
if (SortColumn = NoColumn) or (SortColumn <> Column) then
begin
SortColumn := Column;
SortDirection := sdAscending;
end
else
if SortDirection = sdAscending then
SortDirection := sdDescending
else
SortDirection := sdAscending;
Columns[SortColumn].Color := $F7F7F7;
SortTree(SortColumn, SortDirection, False);
end;
end;
end;
end;
//----------------------------------------------------------------------------------------------------------------------
procedure TWindowsXPForm.XPTreeCompareNodes(Sender: TBaseVirtualTree; Node1, Node2: PVirtualNode;
Column: TColumnIndex; var Result: Integer);
var
Data1, Data2: PEntry;
begin
Data1 := Sender.GetNodeData(Node1);
Data2 := Sender.GetNodeData(Node2);
case Column of
0:
Result := CompareText(Data1.Caption, Data2.Caption);
1:
Result := Data1.Size - Data2.Size;
end;
end;
//----------------------------------------------------------------------------------------------------------------------
procedure TWindowsXPForm.XPTreeGetHint(Sender: TBaseVirtualTree; Node: PVirtualNode; Column: TColumnIndex;
var LineBreakStyle: TVTTooltipLineBreakStyle; var HintText: String);
begin
// Show only a dummy hint. It is just to demonstrate how to do it.
HintText := 'Size larger than 536 MB' + LineEnding +
'Folders: addins, AppPatch, Config, Connection Wizard, ...' + LineEnding +
'Files: 1280.bmp, 1280x1024.bmp, 2001 94 mars.bmp, ac3api.ini, ...';
end;
//----------------------------------------------------------------------------------------------------------------------
procedure TWindowsXPForm.Label4Click(Sender: TObject);
begin
OpenURL('http://groups.yahoo.com/group/VirtualExplorerTree');
end;
//----------------------------------------------------------------------------------------------------------------------
procedure TWindowsXPForm.ToolButton9Click(Sender: TObject);
begin
//todo: implement Print support in VTV
//if PrintDialog.Execute then ;
// XPTree.Print(Printer, False);
end;
//----------------------------------------------------------------------------------------------------------------------
procedure TWindowsXPForm.XPTreeStateChange(Sender: TBaseVirtualTree; Enter, Leave: TVirtualTreeStates);
begin
if not (csDestroying in ComponentState) then
UpdateStateDisplay(Sender.TreeStates, Enter, Leave);
end;
//----------------------------------------------------------------------------------------------------------------------
end.
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