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Drag & Drop from Listbox to Treeview

Posted on 2003-12-09
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Last Modified: 2010-05-18
Hi,

I need some help / code / examples to drag and drop a value from a Listbox to a treeview. The value from the listbox should will always create a node (with the value of the listbox item) underneath the node that it is dropped on.

Regards

Pierre
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Comment
Question by:barnarp
  • 4
  • 2
6 Comments
 
LVL 27

Accepted Solution

by:
kretzschmar earned 100 total points
ID: 9904349
a sample

unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, ComCtrls, StdCtrls;

type
  TForm1 = class(TForm)
    ListBox1: TListBox;  //dragmode is set to dmAutomatic
    TreeView1: TTreeView;
    procedure TreeView1DragOver(Sender, Source: TObject; X, Y: Integer;
      State: TDragState; var Accept: Boolean);
    procedure TreeView1DragDrop(Sender, Source: TObject; X, Y: Integer);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}


procedure TForm1.TreeView1DragOver(Sender, Source: TObject; X, Y: Integer;
  State: TDragState; var Accept: Boolean);
begin
  accept := source = listbox1;
end;

procedure TForm1.TreeView1DragDrop(Sender, Source: TObject; X, Y: Integer);
var ANode : TTreeNode;
begin
  ANode := TreeView1.GetNodeAt(x,y);
  TreeView1.Items.Add(ANode,ListBox1.Items[Listbox1.ItemIndex]);
  //or if meant as Child (just uncomment)
  //TreeView1.Items.AddChild(ANode,ListBox1.Items[Listbox1.ItemIndex]);

  //if wanted to delete the listboxentry (just uncomment)
  //ListBox1.Items.Delete(Listbox1.ItemIndex);
end;

end.

meikl ;-)
0
 

Author Comment

by:barnarp
ID: 9912006
thanks, wil check it out
0
 
LVL 27

Expert Comment

by:kretzschmar
ID: 9912019
take your time ;-)
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Author Comment

by:barnarp
ID: 9912146
100% thanks alot.
0
 
LVL 27

Expert Comment

by:kretzschmar
ID: 9912166
if it works for you,
don't forget the grade
-> just press the accept-button near the comment, which helps you most

otherwise reask/comment for clarification

meikl ;-)
0
 
LVL 27

Expert Comment

by:kretzschmar
ID: 9912243
thanks, glad to helped you :-)

meikl ;-)
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