Add KeyEvent to Canvas : Canvas « SWT « Java Tutorial

1. Java Tutorial
2. SWT
3. Canvas

import org.eclipse.swt.SWT;
import org.eclipse.swt.events.KeyEvent;
import org.eclipse.swt.events.KeyListener;
import org.eclipse.swt.graphics.Font;
import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.graphics.Rectangle;
import org.eclipse.swt.layout.RowLayout;
import org.eclipse.swt.widgets.Canvas;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;

public class CanvasKeyEvent {

  public static void main(String[] args) {
    final Display display = new Display();
    Shell shell = new Shell(display);
    
    shell.setLayout(new RowLayout());
    final Canvas canvas = new Canvas(shell, SWT.NULL);
    canvas.setSize(500, 500);
    canvas.setBackground(display.getSystemColor(SWT.COLOR_YELLOW));

    canvas.addKeyListener(new KeyListener() {
      public void keyPressed(KeyEvent e) {
        GC gc = new GC(canvas);
        Rectangle rect = canvas.getClientArea();
        gc.fillRectangle(rect.x, rect.y, rect.width, rect.height);
        
        Font font = new Font(display, "Arial", 32, SWT.BOLD );
        gc.setFont(font);
        
        gc.drawString("" + e.character, 15, 10);
        
        gc.dispose();
        font.dispose();
      }

      public void keyReleased(KeyEvent e) {
      }
    });
    
    shell.open();
    while (!shell.isDisposed()) {
      if (!display.readAndDispatch()) {
        display.sleep();
      }
    }
  }

}

17.20.Canvas
	17.20.1.	Repaint Canvas
	17.20.2.	Canvas: scroll an image (flicker free, no double buffering)
	17.20.3.	Add Traverse event to Canvas
	17.20.4.	Add Controls to Canvas
	17.20.5.	Add KeyEvent to Canvas