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| unit Unit1;
interface
uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, StdCtrls, VirtualTrees, ImgList, Spin;
type
TForm1 = class(TForm)
VST: TVirtualStringTree;
Edit1: TEdit;
Button1: TButton;
Button2: TButton;
Button3: TButton;
ImageList1: TImageList;
StaticText1: TStaticText;
SpinEdit1: TSpinEdit;
procedure Button1Click(Sender: TObject);
procedure VSTGetText(Sender: TBaseVirtualTree; Node: PVirtualNode;
Column: TColumnIndex; TextType: TVSTTextType;
var CellText: WideString);
procedure VSTClick(Sender: TObject);
procedure VSTFreeNode(Sender: TBaseVirtualTree; Node: PVirtualNode);
procedure Button2Click(Sender: TObject);
procedure Button3Click(Sender: TObject);
procedure VSTCompareNodes(Sender: TBaseVirtualTree; Node1,
Node2: PVirtualNode; Column: TColumnIndex; var Result: Integer);
procedure VSTHeaderClick(Sender: TVTHeader; Column: TColumnIndex;
Button: TMouseButton; Shift: TShiftState; X, Y: Integer);
procedure VSTGetImageIndex(Sender: TBaseVirtualTree;
Node: PVirtualNode; Kind: TVTImageKind; Column: TColumnIndex;
var Ghosted: Boolean; var ImageIndex: Integer);
private
public
end;
var
Form1: TForm1;
implementation
{$R *.dfm}
type
PTreeData = ^TTreeData;
TTreeData = record
FCaption: String;
FColumn1: String;
Image : Integer;
end;
function AddVSTStructure(AVST: TCustomVirtualStringTree; ANode: PVirtualNode;
ARecord: TTreeData): PVirtualNode;
var
Data: PTreeData;
begin
Result:=AVST.AddChild(ANode);
Data:=AVST.GetNodeData(Result);
Avst.ValidateNode(Result, False);
Data^.FCaption:=ARecord.FCaption;
Data^.FColumn1:=ARecord.FColumn1;
Data^.Image:=ARecord.Image;
end;
procedure TForm1.Button1Click(Sender: TObject);
var
TreeData: TTreeData;
Node : PVirtualNode;
begin
VST.NodeDataSize:=SizeOf(TTreeData);
VST.BeginUpdate;
TreeData.FCaption:=Edit1.Text;
TreeData.FColumn1:='Bild-Index ' + IntToStr(SpinEdit1.Value);
TreeData.Image:=SpinEdit1.Value;
Node:=VST.FocusedNode;
AddVSTStructure(VST,Node,TreeData);
VST.EndUpdate;
end;
procedure TForm1.VSTGetText(Sender: TBaseVirtualTree; Node: PVirtualNode;
Column: TColumnIndex; TextType: TVSTTextType; var CellText: WideString);
var
Data: PTreeData;
begin
if not Assigned(Node) then Exit;
Data:=VST.GetNodeData(Node);
case Column of
0: CellText:=Data.FCaption;
1: CellText:=Data.FColumn1;
end;
end;
procedure TForm1.VSTClick(Sender: TObject);
var
Node: PVirtualNode;
Data: PTreeData;
begin
Node:=VST.FocusedNode;
if not Assigned(Node) then Exit;
Data:=VST.GetNodeData(Node);
StaticText1.Caption:='Name: ' + Data.FCaption + ' Spalte: ' +Data.FColumn1;
end;
procedure TForm1.VSTFreeNode(Sender: TBaseVirtualTree; Node: PVirtualNode);
var
Data: PTreeData;
begin
if not Assigned(Node) then Exit;
Data:=VST.GetNodeData(Node);
if Assigned(Data) then
begin
Data.FCaption:='';
Data.FColumn1:='';
Data.Image:=0;
end;
end;
procedure TForm1.Button2Click(Sender: TObject);
var
Node: PVirtualNode;
begin
Node:=VST.FocusedNode;
if not Assigned(Node) then Exit;
VST.BeginUpdate;
VST.DeleteChildren(Node);
VST.DeleteNode(Node);
VST.EndUpdate;
end;
procedure TForm1.Button3Click(Sender: TObject);
begin
VST.BeginUpdate;
VST.Clear;
VST.EndUpdate;
end;
procedure TForm1.VSTCompareNodes(Sender: TBaseVirtualTree; Node1,
Node2: PVirtualNode; Column: TColumnIndex; var Result: Integer);
var
data1: PTreeData;
data2: PTreedata;
begin
Data1:=VST.GetNodeData(Node1);
Data2:=VST.GetNodeData(Node2);
if Column = 0 then
begin
if (not Assigned(Data1)) or (not Assigned(Data2)) then Result:=0;
Result:=CompareText(Data1.FCaption, Data2.FCaption);
end;
end;
procedure TForm1.VSTHeaderClick(Sender: TVTHeader; Column: TColumnIndex;
Button: TMouseButton; Shift: TShiftState; X, Y: Integer);
begin
if Column = 0 then
begin
VST.BeginUpdate;
VST.SortTree(Column,Sender.SortDirection,True);
VST.EndUpdate;
if Sender.SortDirection=sdAscending then
Sender.SortDirection:=sdDescending
else
Sender.SortDirection:=sdAscending;
end;
end;
procedure TForm1.VSTGetImageIndex(Sender: TBaseVirtualTree;
Node: PVirtualNode; Kind: TVTImageKind; Column: TColumnIndex;
var Ghosted: Boolean; var ImageIndex: Integer);
var
Data: PTreeData;
begin
if not Assigned(Node) then Exit;
Data:=VST.GetNodeData(Node);
VST.BeginUpdate;
case Kind of
ikState: ImageIndex := 2;
ikNormal, ikSelected: case column of
0: ImageIndex := Data.Image;
1: ImageIndex := -1;
end;
end;
VST.EndUpdate;
end;
end. |