title: How to cover SWT control or controls with some transparent layer?
body: <p>I want to implement selecting capability in my custom control. This control contains an image and I want image to turn bluish when selected. I don't want to change image bitwise.</p>
  
  <p>Is it possible to draw some half-transparent blue rectangle above other controls to simulate the selection?</p>
  
  <p><strong>UPDATE</strong></p>
  
  <p>The following code shows no any drawing:</p>
  
  <pre><code>public class ImageWithCaption extends Composite {
  
      private Label imageLabel;
      private Label textLabel;
  
      private void init() {
          setLayout(new GridLayout(1, false));
  
          imageLabel = new Label(this, SWT.NONE);
          imageLabel.setLayoutData(new GridData(SWT.CENTER, SWT.CENTER, false, false));
  
          textLabel = new Label(this, SWT.NONE);
          textLabel.setLayoutData(new GridData(SWT.CENTER, SWT.CENTER, false, false));
  
          addPaintListener(new PaintListener() {
  
              @Override
              public void paintControl(PaintEvent e) {
  
                  GC gc = e.gc;
  
  
                  gc.setForeground(e.display.getSystemColor(SWT.COLOR_BLUE));
                  gc.fillRectangle(0, 0, e.width, e.height);
  
              }
          });
      }
  
      public ImageWithCaption(Composite parent, int style) {
          super(parent, style);
          init();
  
      }
  
      public void setText(String text) {
          textLabel.setText(text);
      }
  
      public String getText() {
          return textLabel.getText();
      }
  
      public Image getImage() {
          return imageLabel.getImage();
      }
  
      public void setImage(Image image) {
          imageLabel.setImage(image);
      }
  
  
  
  
  }
  </code></pre>