Question

Delphi Treeview Expand/Collapse image

Asked by: tirbanqs

Hi guys,

How can I change the expand and collapse image of treeview?
I wanted to change it like an arrow.

Thanks

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Asked On
2009-09-07 at 06:15:34ID24712571
Tags

Delphi

Topics

Graphics and Delphi Programming

,

Delphi Programming

,

Delphi Components

Participating Experts
2
Points
125
Comments
7

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Answers

 

by: LukA_YJKPosted on 2009-09-07 at 22:02:53ID: 25278753

You can use GetImageIndex to draw custom images at every node. Something like below:

procedure TForm1.TreeView1GetImageIndex(Sender: TObject; Node: TTreeNode);
begin
  with Node do begin
    if Expanded then ImageIndex := 0
    else ImageIndex := 1;
    SelectedIndex := ImageIndex;
  end;
end;

ShowButtons set to False will hide those plus icons.

 

by: tirbanqsPosted on 2009-09-08 at 00:09:00ID: 25279237

What i mean is the plus and minus icons when expand/collapse.
Can i change those?

 

by: LukA_YJKPosted on 2009-09-08 at 02:49:07ID: 25280054

As I said, if you go this SIMPLER way, you don't need to change plus/minus images, you can hide them and draw your own images. EE does not allow attaching .zip file with the project unfortunately.

 

by: tirbanqsPosted on 2009-09-08 at 03:33:31ID: 25280326

Can you post your code...

 

by: EddieShipmanPosted on 2009-09-08 at 05:28:25ID: 25281106

Use http://www.ee-stuff.com to post attachments that aren't allowed here. Login using your E-E login and you should be able to attache the zip file, make sure you know the question# it refers to, however..

 

by: LukA_YJKPosted on 2009-09-08 at 07:56:10ID: 25282519

I uploaded the .zip file (http://www.ee-stuff.com/Expert/Upload/viewFilesQuestion.php?qid=24712571), but it didn't update the question. Did I miss something?
Tirbangs, the main code is up there actually.

unit Unit1;
 
interface
 
uses
  Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
  ComCtrls;
 
type
  TForm1 = class(TForm)
    TreeView1: TTreeView;
    ImageList1: TImageList;
    procedure TreeView1GetImageIndex(Sender: TObject; Node: TTreeNode);
  private
    { Private declarations }
  public
    { Public declarations }
  end;
 
var
  Form1: TForm1;
 
implementation
 
{$R *.DFM}
 
procedure TForm1.TreeView1GetImageIndex(Sender: TObject; Node: TTreeNode);
begin
  with Node do begin
    if Expanded then ImageIndex := 0
    else ImageIndex := 1;
    SelectedIndex := ImageIndex;
  end;
end;
 
end.
 
object Form1: TForm1
  Left = 281
  Top = 120
  Width = 400
  Height = 300
  Caption = 'Form1'
  Font.Charset = DEFAULT_CHARSET
  Font.Color = clWindowText
  Font.Height = -11
  Font.Name = 'MS Sans Serif'
  Font.Style = []
  Position = poScreenCenter
  PixelsPerInch = 96
  TextHeight = 13
  object TreeView1: TTreeView
    Left = 0
    Top = 0
    Width = 392
    Height = 273
    ShowButtons = False
    BorderStyle = bsNone
    Indent = 19
    Items.Data = {
      01000000210000000000000000000000FFFFFFFFFFFFFFFF0000000002000000
      086162736F6C757465210000000000000000000000FFFFFFFFFFFFFFFF000000
      00020000000862756C6C736869741F0000000000000000000000FFFFFFFFFFFF
      FFFF0000000000000000067374757069641E0000000000000000000000FFFFFF
      FFFFFFFFFF0000000000000000056964696F741D0000000000000000000000FF
      FFFFFFFFFFFFFF00000000000000000464756D62}
    OnGetImageIndex = TreeView1GetImageIndex
    Align = alClient
    TabOrder = 0
    ParentShowHint = False
    ShowHint = True
    Images = ImageList1
  end
  object ImageList1: TImageList
    Left = 152
    Top = 80
    Bitmap = {
      494C010102000400040010001000FFFFFFFFFF10FFFFFFFFFFFFFFFF424D3600
      0000000000003600000028000000400000001000000001002000000000000010
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  end
end

                                              
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by: tirbanqsPosted on 2009-09-09 at 04:19:48ID: 25289972

Thanks LukA YJK.
I placed my code in OnCollapsed and OnExpanded event.

20120131-EE-VQP-002

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