Solved

Loading Bitmap into ImageList

Posted on 2006-06-30
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Last Modified: 2013-12-03
Hi, All
I have saved a ImageList using the ImageEditor to a bitmap file. They are nice small bitmaps on a clFuchsia background. When I try to load them into an ImageList, I can't seem to specifiy the width/height, and the ImageList doesn't seem to figure it out correctly. The bitmap is 9 images by 9 images.
When I load them, the first nine are perfect, but the rest are blank. This is in a component that I am building. Also, no matter how I change the button size, they stay the same!

     fImageList:=TImageList.Create(Self);
     ABitmap:=TBitmap.Create;
     ABitmap.LoadFromFile('c:\PMan\dkcomponents\ToolBitmaps.bmp');
     fImageList.AddMasked(ABitmap, clFuchsia);
     ABitmap.Free;

     for MyCount := 0 to 10 - 1 do begin
        MyButton:=TToolButton.Create(Self);
        with MyButton do begin
           MyButton.Parent:=TWinControl(fToolBar);
           MyButton.Width:=150;
           MyButton.ImageIndex:=MyCount;
           MyButton.Visible:=True;
        end;
     end;

Any Thoughts?
Thanks
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Comment
Question by:dkeene
4 Comments
 
LVL 26

Accepted Solution

by:
Russell Libby earned 125 total points
ID: 17018947
You could try the following, which manually adds the images (determines image count based on height of loaded image, then dividing width by the height)

Regards,
Russell

var  bmpImages:     TBitmap;
     bmpImage:      TBitmap;
     clTrans:       TColor;
     dwImages:      Integer;
     dwIndex:       Integer;
begin

  FImageList:=TImageList.Create(Self);
  bmpImages:=TBitmap.Create;
  try
     bmpImages.LoadFromFile('c:\PMan\dkcomponents\ToolBitmaps.bmp');
     clTrans:=bmpImages.TransparentColor;
     FImageList.Height:=bmpImages.Height;
     FImageList.Width:=bmpImages.Height;
     bmpImage:=TBitmap.Create;
     try
        bmpImage.Height:=bmpImages.Height;
        bmpImage.Width:=bmpImages.Height;
        if (bmpImages.Height > 0) then
        begin
           dwImages:=bmpImages.Width div bmpImages.Height;
           for dwIndex:=0 to Pred(dwImages) do
           begin
              BitBlt(bmpImage.Canvas.Handle, 0, 0, bmpImage.Width, bmpImage.Height, bmpImages.Canvas.Handle, dwIndex * bmpImage.Width, 0, SRCCOPY);
              FImageList.AddMasked(bmpImage, clTrans);
           end;
        end;
     finally
        bmpImage.Free;
     end;
  finally
     bmpImages.Free;
  end;
0
 
LVL 22

Expert Comment

by:Ferruccio Accalai
ID: 17029428
rllibby is right, BTW i usually use a faster method to save an imagelist and then load it.

Let's say that you have a simple application with a form, a tbutton and your TImageList called MyImageList with every needed glyph stored in it.

Well, just save you timagelist component as follows:

procedure TForm1.Button1Click(Sender: TObject);
begin
WriteComponentResFile('c:\PMan\dkcomponents\ToolBitmaps.bin',MyImageList);
end;
(You have to do this just one time as you've done for your bitmap)
Well, now that you've saved yor imagelist you can once load it in your component as follows:

FImageList:=TImageList.Create(Self);
try
   ReadComponentResFile('c:\PMan\dkcomponents\ToolBitmaps.bin', FImageList);
except
  MessageDlg('Warning! Images bin file may be corrupted or do not exists!',mtWarning,[mbOK],0);
end;
for MyCount := 0 to FImageList.count - 1 do begin
        MyButton:=TToolButton.Create(Self);
        with MyButton do begin
           MyButton.Parent:=TWinControl(fToolBar);
           MyButton.Width:=150;
           MyButton.ImageIndex:=MyCount;
           MyButton.Visible:=True;
        end;
     end;

That's all. Bin file is smallest than the bitmap, fast loadable and protected (nobody could use it as a bitmap).

Hope this help.

F68 ;-)
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