implements PaintListener : PaintListener « org.eclipse.swt.events « Java by API

1. Java by API
2. org.eclipse.swt.events
3. PaintListener

implements PaintListener

import org.eclipse.swt.SWT;
import org.eclipse.swt.events.PaintEvent;
import org.eclipse.swt.events.PaintListener;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.widgets.Canvas;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;

public class MainClass {

  public static void main(String[] a) {

    final Display d = new Display();
    final Shell shell = new Shell(d);

    shell.setSize(250, 200);

    shell.setLayout(new FillLayout());

    Canvas drawingCanvas = new Canvas(shell, SWT.NONE);
    drawingCanvas.addPaintListener(new ArcExamplePaintListener());
    drawingCanvas.redraw();
    
    shell.open();
    while (!shell.isDisposed()) {
      if (!d.readAndDispatch())
        d.sleep();
    }
    d.dispose();
  }
}

class ArcExamplePaintListener implements PaintListener {
  public void paintControl(PaintEvent e) {
    Canvas canvas = (Canvas) e.widget;
    int x = canvas.getBounds().width;
    int y = canvas.getBounds().height;

    e.gc.setBackground(e.display.getSystemColor(SWT.COLOR_BLACK));

    e.gc.fillArc((x - 200) / 2, (y - 200) / 2, 200, 200, 0, 90);
  }
}
           
       

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