How to Enable MouseRelease Event Handling After Drag and Drop on JLabel?

Drag and Drop Functionality with Custom Mouse Event Handling for JLabels

You seek to implement drag and drop functionality by overriding mouse events on a JLabel array named "Thumbnails." However, you have observed that the mouseReleased event handler is not triggered after defining drag and drop in the mousePressed event handler.

Understanding the Issue

In this specific scenario, the mouse release event is not registered because the drag and drop operation intercepts the mouse events. When you invoke the exportAsDrag method within the mousePressed handler, it initiates the drag operation, consuming subsequent mouse events within the same operation.

Solution

To resolve this, you can move the drag and drop logic to a separate mouseDragged event handler. This ensures that the mouse release event can be handled independently.

Revised Code:

<code class="java">Thumbnails[I_Loop].addMouseListener(new MouseAdapter() {
    public void mousePressed(MouseEvent me) {
        JComponent comp = (JComponent) me.getSource();
        TransferHandler handler = comp.getTransferHandler();
    }

    @Override
    public void mouseReleased(MouseEvent me) {
        System.out.println("here mouse released");
    }
});

Thumbnails[I_Loop].addMouseMotionListener(new MouseMotionAdapter() {
    @Override
    public void mouseDragged(MouseEvent me) {
        JComponent comp = (JComponent) me.getSource();
        TransferHandler handler = comp.getTransferHandler();
        handler.exportAsDrag(comp, me, TransferHandler.COPY);
    }
});</code>

By segregating the drag and drop functionality into a dedicated mouseDragged handler, you can maintain the desired behavior and ensure that mouse release events are handled correctly for your JLabel array.

Additional Notes:

• Consider using a Transferable implementation to define the data transferred during drag and drop operations.
• Explore additional options for drag and drop functionality, such as using a JLayeredPane or a MouseMotionListener.

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