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

[Arnaud De Muyser <ademuyser@xxxxxxxxxx>]

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>
Sent by: platform-swt-dev-admin@xxxxxxxxxxx

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();
        } 
}