Source Code : Capture a widget image with a GC

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Capture a widget image with a GC

/*
 * GC example snippet: capture a widget image with a GC
 *
 * For a list of all SWT example snippets see
 * http://dev.eclipse.org/viewcvs/index.cgi/%7Echeckout%7E/platform-swt-home/dev.html#snippets
 */
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.PaintEvent;
import org.eclipse.swt.events.PaintListener;
import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Canvas;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.Listener;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Table;
import org.eclipse.swt.widgets.TableItem;

public class Snippet95 {

  public static void main(String[] args) {
    final Display display = new Display();
    final Shell shell = new Shell(display);
    shell.setText("Widget");
    shell.setBounds(10, 10, 200, 200);

    final Table table = new Table(shell, SWT.MULTI);
    table.setLinesVisible(true);
    table.setBounds(10, 10, 100, 100);
    for (int i = 0; i < 9; i++) {
      new TableItem(table, SWT.NONE).setText("item" + i);
    }

    Button button = new Button(shell, SWT.PUSH);
    button.setText("Capture");
    button.setBounds(10, 140, 50, 20);
    button.addListener(SWT.Selection, new Listener() {
      public void handleEvent(Event event) {
        Point tableSize = table.getSize();
        GC gc = new GC(table);
        final Image image = new Image(display, tableSize.x, tableSize.y);
        gc.copyArea(image, 0, 0);
        gc.dispose();

        Shell popup = new Shell(shell);
        popup.setText("Image");
        popup.setBounds(50, 50, 200, 200);
        popup.addListener(SWT.Close, new Listener() {
          public void handleEvent(Event e) {
            image.dispose();
          }
        });

        Canvas canvas = new Canvas(popup, SWT.NONE);
        canvas.setBounds(10, 10, 150, 150);
        canvas.addPaintListener(new PaintListener() {
          public void paintControl(PaintEvent e) {
            e.gc.drawImage(image, 0, 0);
          }
        });
        popup.open();
      }
    });

    shell.open();
    while (!shell.isDisposed()) {
      if (!display.readAndDispatch())
        display.sleep();
    }
    display.dispose();
  }
}


           
       

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