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Add KeyEvent to 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();       }     }   } }