如何將TreeView內的資料拖曳到 另一個TreeView |
|
尚未結案
|
|
T.J.B
版主   發表：29 回覆：532 積分：497 註冊：2002-08-14 發送簡訊給我 |
|
|
qoo1234
版主 發表：256 回覆：1167 積分：659 註冊：2003-02-24 發送簡訊給我 |
Here is an example of using OnDragOver and OnDragDrop events: procedure TForm1.TreeViewDragOver(Sender, Source: TObject; X, Y: Integer;
State: TDragState; var Accept: Boolean);
var SourceNode, TargetNode: TTreeNode;
SourceView, TargetView: TTreeView;
begin
SourceView:=Source as TTreeView; SourceNode:=SourceView.Selected;
TargetView:=Sender as TTreeView; TargetNode:=TargetView.GetNodeAt(X,Y);
// scrolling of the target view
if y<20
then SendMessage(TargetView.Handle,WM_VSCROLL,SB_LINEUP,0);
if y>TargetView.Height-20
then SendMessage(TargetView.Handle,WM_VSCROLL,SB_LINEDOWN,0);
// accept:=here you'll set any condition you need
end; procedure TForm1.TreeViewDragDrop(Sender, Source: TObject; X, Y: Integer);
var SourceNode, TargetNode: TTreeNode;
SourceView, TargetView: TTreeView;
begin
SourceView:=Source as TTreeView; SourceNode:=SourceView.Selected;
TargetView:=Sender as TTreeView; TargetNode:=TargetView.GetNodeAt(X,Y);
SourceView.Items.BeginUpdate; // copying ... SourceView.Items.EndUpdate;
end;
|
|
qoo1234
版主 發表：256 回覆：1167 積分：659 註冊：2003-02-24 發送簡訊給我 |
依需要自行修改
unit Unit1; interface uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, ComCtrls; type
TForm1 = class(TForm)
TreeView1: TTreeView;
TreeView2: TTreeView;
procedure FormCreate(Sender: TObject);
procedure TreeView1DragDrop(Sender, Source: TObject; X, Y: Integer);
procedure TreeView2DragOver(Sender, Source: TObject; X, Y: Integer;
State: TDragState; var Accept: Boolean);
private
{ Private declarations }
public
{ Public declarations }
end; var
Form1: TForm1;
FDest, FSource: TTreeNode;
implementation {$R *.dfm} function NodeCopy(TreeView: TTreeView; Dest, Source: TTreeNode): TTreeNode;
var
i : Integer;
aNode : TTreeNode;
begin
Result := Dest;
aNode := TreeView.Items.AddChild(Dest, '');
aNode.Assign(Source);
for i := 0 to Source.Count - 1 do
NodeCopy(TreeView, aNode, Source.Item[i]);
end; procedure MoveNode(TreeView: TTreeView; Dest, Source: TTreeNode);
begin
NodeCopy(TreeView, Dest, Source);
Source.Free;
end; procedure TForm1.FormCreate(Sender: TObject);
begin
Treeview1.DragMode:=dmAutomatic;
Treeview2.DragMode:=dmAutomatic;
end; procedure TForm1.TreeView1DragDrop(Sender, Source: TObject; X, Y: Integer);
begin
FSource:=TreeView1.Selected;
FDest:=TreeView2.GetNodeAt(X,Y);
if y<20
then SendMessage(TreeView2.Handle,WM_VSCROLL,SB_LINEUP,0);
if y>TreeView2.Height-20
then SendMessage(TreeView2.Handle,WM_VSCROLL,SB_LINEDOWN,0);
end; procedure TForm1.TreeView2DragOver(Sender, Source: TObject; X, Y: Integer;
State: TDragState; var Accept: Boolean);
begin
FSource:=TreeView1.Selected;
FDest:=TreeView2.GetNodeAt(X,Y); if (FDest<> nil)and (FSource<> nil) then
MoveNode(TreeView1,FDest,FSource); // Copy TreeView1.Items.EndUpdate;
end; end.
|
|
sl@cableplus.com.cn
高階會員  發表：168 回覆：359 積分：130 註冊：2004-03-26 發送簡訊給我 |
|
|
T.J.B
版主 發表：29 回覆：532 積分：497 註冊：2002-08-14 發送簡訊給我 |
發表時間：2004-07-08 00:37:12
IP:218.160.xxx.xxx 未訂閱
系統時間：2024-11-25 2:25:02
聯絡我們 | Delphi K.Top討論版
| 本站聲明 |
|
1. 本論壇為無營利行為之開放平台，所有文章都是由網友自行張貼，如牽涉到法律糾紛一切與本站無關。 2. 假如網友發表之內容涉及侵權，而損及您的利益，請立即通知版主刪除。 3. 請勿批評中華民國元首及政府或批評各政黨，是藍是綠本站無權干涉，但這裡不是政治性論壇！ |