Re: [platform-swt-dev] problem about Canvas' max size.

[Yue MA <mayue@xxxxxxxxxx>]

So, the Canvas has a size limitation?

Ma Yue
Arnaud De Muyser <ademuyser@xxxxxxxxxx>

Arnaud De Muyser <ademuyser@xxxxxxxxxx>
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2004-11-12 21:40

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Subject	Re: [platform-swt-dev] problem about Canvas' max size.

Probably a windows limit on widget size (and coordinates). 

I guess you win the big price at las vegas to buy a screen enough large to see a canvas with that size ... ;-).

Jiao Li <lijiao@xxxxxxxxxx>
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11/12/2004 11:03 AM

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Subject	[platform-swt-dev] problem about Canvas' max size.

Hi,all 
  I met some problems when I use SWT's Canvas control. 
  When I draw on Canvas the max size of Canvas only can extend to 32767, here I set the max size 33000 so I can see the effect. 
  I don't know if this is a bug of Canvas or this is Windows control feature. 
  Can you give me some suggestions? 
  The following is the code I test. 
  Platform: WinXP Prefessional, Eclipse 3.0.1 RC. 

  public class Scroll { 

       public static void main(String[] args) { 
               Display display = new Display(); 
               Shell shell = new Shell(display); 
              shell.setLayout(new FillLayout()); 
               ScrolledComposite sc = new ScrolledComposite(shell, SWT.HORIZONTAL | SWT.VERTICAL); 
               sc.setLayout(new FillLayout()); 
               final Canvas canvas = new Canvas(sc,0); 
               canvas.setSize(33000, 200); 
               sc.setContent(canvas); 
               sc.setMinSize(33000,33000); 
               sc.setExpandHorizontal(true); 
               sc.setExpandVertical(true); 
       
               canvas.addPaintListener(new PaintListener(){         
                       public void paintControl(PaintEvent arg0) { 
                               // TODO Auto-generated method stub 
                               GC gc = arg0.gc; 
                               //here 33000 is bigger than 32767 so drawing operations is end at 32767. 
                               gc.drawLine(0, 0, 33000, 200); 
                               gc.dispose(); 
                       } 
               }); 
       
               shell.open(); 
               while(!shell.isDisposed()){ 
                       if(!display.readAndDispatch()){ 
                               display.sleep(); 
                       } 
               } 
               display.dispose(); 
       } 
}