[Lazarus] "Known issues" wike page outdated - ShowInTaskBar in GTK2/GNOME

[Flávio Etrusco]

hi all, 

Thanks for your answers. 

I forgot to specify that I'm in Win32 with 0.9.28.2 (not a snapshot). 

Peter, I uncommented the 2 lines and I replaced clGreen by clWhite. The image is displayed correctly. 
I changed the background of the image and I set it to blue (FF0000). The image is displayed correctly. 
I also replace the clWhite by clBlue. The image is displayed correctly. 

Somebody can explain me why I had this problem? 

Is there a visual component that allow to display an image from an imagelist (a TImage descendant for example)? 


Regards 

-- 
Pierre Delore 

http://datalinkwristapps.free.fr 
http://dpsite.free.fr 

----- "Peter Williams" <pewtas at gmail.com> a écrit : 
> Hi Pierre and Lazarus list, 
> 
> 2010/2/22 Pierre Delore <dpliste at free.fr>: 
> > Hi, 
> > 
> > I have a transparency problem when I try to display a bitmap stored in a 
> > TImagList. 
> > The bitmap I want to display is a green arrow with a white background. I 
> > want to display it without transparency. 
> > With the code below the bitmap is displayed but the background is not white 
> > (it's a copy of a part of the screen). If I uncomment the 2 lines with the 
> > fillrect, the background is set to green. 
> 
> I think that you commented code reveals why this is happening. See my 
> untested suggested code 
> changes below. 
> 
> > 
> > Any ideas? 
> > 
> a-------------------------------------------------------------------------------------------------------- 
> > procedure TImgList.Paint; 
> > var 
> > Bitmap: TBitmap; 
> > begin 
> > Bitmap := TBitmap.Create; 
> > try 
> > Bitmap.Height := pHeight; 
> > Bitmap.Width := pWidth; 
> > 
> > TImgListItem(ListImg.Items[index]).ImgList.GetBitmap(tagv,Bitmap); 
> > //the image is a green arrow with a white background 
> > 
> > Bitmap.Transparent:=False; 
> > 
> > //Canvas.Brush.Color := clGreen; If I uncomment this part the 
> > background is set to green 
> 
> // set colour of the Canvas Brush to white (using the constant "clWhite") 
> Canvas.Brush.Color := clWhite; 
> 
> > //Canvas.FillRect(0,0,pwidth,pheight); 
> 
> // now fill the background of the Canvas with the Canvas.Brush.Color 
> set to colour white 
> Canvas.FillRect(0,0,pwidth,pheight); 
> 
> // note that my changes (above) are proposed, untested to the code 
> which you posted. 
> 
> // my modifications to your code *should* make the background of the 
> Canvas clWhite before you draw Bitmap -- with the next line of code. 
> 
> > Canvas.Draw(0, 0, Bitmap); 
> 
> // hopefully now Bitmap will be drawn on a clWhite background... which 
> is the effect you said in your email you're wanting. 
> 
> > finally 
> > Bitmap.Free; 
> > end; 
> > 
> > inherited Paint; 
> > end; 
> > 
> > 
> > Regards. 
> > 
> > -- 
> > Pierre Delore 
> > 
> > http://datalinkwristapps.free.fr 
> > http://dpsite.free.fr 
> > 
> > -- 
> > _______________________________________________ 
> > Lazarus mailing list 
> > Lazarus at lists.lazarus.freepascal.org 
> > http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus 
> > 
> > 
> 
> I hope that these mods to your posted code help. Please note that they 
> are proposed and untested. 
> 
> Note: in my comments I use the British spelling of the word "colour" 
> not American spelling of "color". 
> 
> With LOVE from PEW ;-))) 
> 
> Fond Regards, Peter Eric (aka 'pew') WILLIAMS 
> from Hobart, Tasmania, Australia -- phone (03) 6236-9675 
> 
> My free website is: http://pewtas.googlepages.com (or) 
> http://tinyurl.com/yuyejs 
> 
> (please visit my free website and let me know what you think about it.) 
> 
> -- 
> _______________________________________________ 
> Lazarus mailing list 
> Lazarus at lists.lazarus.freepascal.org 
> http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus 
>
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