Question

I am new in Swing. I have requirement to implement drag and drop using swing. In current frame contains different panels i.e.,Center Panel & LeftPanel have sub panels i.e., Controls Panel,Properties Panel.I trying to drag and drop the labels/jbuttons/Images from Control Panel into Center Panel.These panels are used BorderLayout

I tried drag and drop with Mouse Event.I put mouse listner on Control Panel. When I dropping the label/image into center panel.It reads -X & Y Cooridnates and check the code

private void mak_lis(final SLabel l) {
   l.addMouseListener(new MouseAdapter() {
    public void mousePressed(MouseEvent m) {
       System.out.println("mak_lis Mouse mousePressed");

    setCursor(yd);
    // l.setBorder(new MatteBorder(1,1,1,1,Color.black));

    }
    public void mouseReleased(MouseEvent m) {
       l.setBorder(null);
       setCursor(dc);
       System.out.println("mak_lis Mouse mouseReleased");
       int x = -(m.getX() + l.getX() - leftPanel.getX());
       int y = m.getY() + l.getY() + leftPanel.getY();
       System.out.println("mak_lis Mouse mouseReleased" + "x" + x+ "y" + y);
       if (y > 0 && x > 0 && y < leftPanel.getHeight() && x < leftPanel.getWidth()) {
        leftPanel.add(new_lab(l, x, y));
                leftPanel.repaint();
        Component[] components1 = leftPanel.getComponents();
        Component component = null;
        for (int i = 0; i < components1.length; i++) {
          // System.out.println("components iii"+ components1[i]);
        component = components1[i];

            }

    }
}

});
}

Please tell me is there any missing here. What is best approches to achieve drag and drop functionality?

Answer 1

This is not how drag and drop is accomplished in Java/Swing

There are plenty of examples on SO…

• Drag and Drop custom object from JList into JLabel
• Java – How to drag and drop JPanel with its components
• how to drag and drop files from a directory in java
• Java – visually drag a swing element

I’d also recommend that you checkout How to drag and drop with Java 2