시소당

[SWT] Create a non-rectangular shell to simulate transparency

import  org.eclipse.swt.SWT;
import  org.eclipse.swt.events.PaintEvent;
import  org.eclipse.swt.events.PaintListener;
import  org.eclipse.swt.graphics.Image;
import  org.eclipse.swt.graphics.Point;
import  org.eclipse.swt.graphics.Rectangle;
import  org.eclipse.swt.graphics.Region;
import  org.eclipse.swt.widgets.Display;
import  org.eclipse.swt.widgets.Shell;

public  class  Snippet180  {

    public  static  void  main(String[]  args)  {
        Display  display  =  new  Display();
        final  Image  image  =  display.getSystemImage(SWT.ICON_WARNING);
        //  Shell  must  be  created  with  style  SWT.NO_TRIM
        final  Shell  shell  =  new  Shell(display,  SWT.NO_TRIM  |  SWT.ON_TOP);
        shell.setBackground(display.getSystemColor(SWT.COLOR_RED));
        //  define  a  region
        Region  region  =  new  Region();
        Rectangle  pixel  =  new  Rectangle(0,  0,  1,  1);
        for  (int  y  =  0;  y  <  200;  y  +=  2)  {
            for  (int  x  =  0;  x  <  200;  x  +=  2)  {
                pixel.x  =  x;
                pixel.y  =  y;
                region.add(pixel);
            }
        }
        //  define  the  shape  of  the  shell  using  setRegion
        shell.setRegion(region);
        Rectangle  size  =  region.getBounds();
        shell.setSize(size.width,  size.height);
        shell.addPaintListener(new  PaintListener()  {
            public  void  paintControl(PaintEvent  e)  {
                Rectangle  bounds  =  image.getBounds();
                Point  size  =  shell.getSize();
                e.gc.drawImage(image,  0,  0,  bounds.width,  bounds.height,  10,
                        10,  size.x  -  20,  size.y  -  20);
            }
        });
        shell.open();
        while  (!shell.isDisposed())  {
            if  (!display.readAndDispatch())
                display.sleep();
        }
        region.dispose();
        display.dispose();
    }
}