Solved

Combobox with png files

Posted on 2012-03-21
7
807 Views
Last Modified: 2012-05-18
Hi,

I need a way to put png files (loaded in runtime from files) directly on combobox itemns.
Like: <png file> item text
         <png file> item text  
         etc

I've always a pngobject file that allows my delphy to handle png files.

How can I do that?
0
Comment
Question by:scoopbh
  • 5
7 Comments
 
LVL 19

Expert Comment

by:Thommy
ID: 37751376
Load your PNGs into an imagelist and try this...
How to place images in a Combo Box
0
 
LVL 19

Expert Comment

by:Thommy
ID: 37756770
Have you already checked my post?

Versions prior to Delphi 2009 do not support PNG images!!!

Use extra components to add PNG support for these Delphi versions:
pngcomponents.zip
Delphi PNG and MNG libraries
0
 
LVL 19

Expert Comment

by:Thommy
ID: 37756787
You can also have a look at sourceforge project pngDelphi
0
 
LVL 19

Accepted Solution

by:
Thommy earned 500 total points
ID: 37757019
Just a little demo code for you, which I have programmed in Delphi XE...

ComboBox with PNG images...

unit Unit1;

interface

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

type
  TForm1 = class(TForm)
    ComboBox1: TComboBox;
    procedure FormCreate(Sender: TObject);
    procedure ComboBox1DrawItem(Control: TWinControl; Index: Integer;
      Rect: TRect; State: TOwnerDrawState);
    procedure FormClose(Sender: TObject; var Action: TCloseAction);
  private
    { Private-Deklarationen }
  public
    { Public-Deklarationen }
  end;

var
  Form1: TForm1;

implementation

uses pngImage;

var
  png1,png2,png3,png4: TPngImage;

{$R *.dfm}

procedure TForm1.ComboBox1DrawItem(Control: TWinControl; Index: Integer;
  Rect: TRect; State: TOwnerDrawState);
var
  png: TPngImage;
  bmp: TBitmap;
  Offset: Integer;
begin
  offset:=0;
  bmp:=TBitmap.Create;

  with ComboBox1.Canvas do begin
    FillRect(Rect);
    png := TPngImage(ComboBox1.Items.Objects[index]);
    if png <> nil then begin
      //copy png to combobox
      bmp.Assign(png);

      BrushCopy(Bounds(Rect.Left + 2, Rect.Top + 2, bmp.Width,
      bmp.Height), bmp, Bounds(0, 0, bmp.Width,
      bmp.Height), clred);

      Offset := bmp.width + 8;
    end;
    //Set the caption for each item
    TextOut(Rect.Left + Offset, Rect.Top, Combobox1.Items[Index]);
  end;
  bmp.Free;
end;

procedure TForm1.FormClose(Sender: TObject; var Action: TCloseAction);
begin
  png1.free;
  png2.free;
  png3.free;
  png4.free;
end;

procedure TForm1.FormCreate(Sender: TObject);
begin
  ComboBox1.Style:=csOwnerDrawVariable;

  ComboBox1.ItemHeight:=20;

  png1:=TPngImage.Create;
  png2:=TPngImage.Create;
  png3:=TPngImage.Create;
  png4:=TPngImage.Create;

  png1.LoadFromFile('f:\db\public\betz\test.png');
  png2.LoadFromFile('f:\db\public\betz\test.png');
  png3.LoadFromFile('f:\db\public\betz\test.png');
  png4.LoadFromFile('f:\db\public\betz\test.png');


  ComboBox1.Items.Clear;
  ComboBox1.Items.AddObject('PNG Image 1', png1);
  ComboBox1.Items.AddObject('PNG Image 2', png2);
  ComboBox1.Items.AddObject('PNG Image 3', png3);
  ComboBox1.Items.AddObject('PNG Image 4', png4);

end;

end.

Open in new window


You can use attached PNG file test.png
test.png
0
 
LVL 19

Expert Comment

by:Thommy
ID: 37764534
Any problems with my little demo???
0

Featured Post

Gigs: Get Your Project Delivered by an Expert

Select from freelancers specializing in everything from database administration to programming, who have proven themselves as experts in their field. Hire the best, collaborate easily, pay securely and get projects done right.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
How to debug For loops? 3 49
Unique identifier on a terminal server (rdp) 4 52
Delphi: making a BW image transparent 10 35
Tvertscrollbox like a whatsapp layout 5 26
This article explains how to create forms/units independent of other forms/units object names in a delphi project. Have you ever created a form for user input in a Delphi project and then had the need to have that same form in a other Delphi proj…
Introduction I have seen many questions in this Delphi topic area where queries in threads are needed or suggested. I know bumped into a similar need. This article will address some of the concepts when dealing with a multithreaded delphi database…
This video shows how to use Hyena, from SystemTools Software, to bulk import 100 user accounts from an external text file. View in 1080p for best video quality.
Email security requires an ever evolving service that stays up to date with counter-evolving threats. The Email Laundry perform Research and Development to ensure their email security service evolves faster than cyber criminals. We apply our Threat…

813 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

13 Experts available now in Live!

Get 1:1 Help Now