java - SWT 中 Canvas 图像上的可点击对象

Question

我在图像上使用滤镜创建图像

private void createContents(final Shell shell) { 
shell.setLayout(new FillLayout());
// Create the canvas for drawing
canvas = new Canvas(shell,SWT.NO_BACKGROUND);


canvas.addPaintListener(new PaintListener() {
  public void paintControl(PaintEvent event) {
  Image image = new Image(shell.getDisplay(), canvas.getBounds());
  Image image2 = new Image(shell.getDisplay(), canvas.getBounds());
  //... I add some figure to the images

  ImageData data = image.getImageData();
  ImageData data2 = image2.getImageData();

  for(int j=0;j<rect.width;j++){
   for(int i=0;i<rect.height;i++){
     if(data.getPixel(j, i)<1){
       data.setPixel(j, i , data2.getPixel(j, i));
      }                 
    }
   }

如何向图中添加一些可点击的对象？

Answer 1

那么最好的方法是在 Canvas 上添加一个鼠标控制监听器？

// Create the canvas for drawing
 canvas = new Canvas(shell,SWT.NO_BACKGROUND);
 canvas.addMouseListener(new MouseListener(){
    @Override
    public void mouseDoubleClick(MouseEvent e) {
       // TODO Auto-generated method stub   
    }
    @Override
    public void mouseDown(MouseEvent e) {
       // TODO Auto-generated method stub
       System.out.println("Click"); 
    }
    @Override
    public void mouseUp(MouseEvent e) {
       // TODO Auto-generated method stub   
    }       
});

然后控制点击的位置，可能使用 Rectangle.containt(int x, int y);