Example usage for javax.swing JComponent getTransferHandler

Introduction

In this page you can find the example usage for javax.swing JComponent getTransferHandler.

Prototype

public TransferHandler getTransferHandler()

Source Link

Document

Gets the transferHandler property.

Usage

From source file:org.photovault.swingui.PhotoCollectionThumbView.java

protected void handleDnDDragEvent(MouseEvent e) {
    //Don't bother to drag if no photo is selected
    if (selection.isEmpty()) {
        return;//  w w  w  .  j  a v a 2  s .co  m
    }

    if (firstMouseEvent != null) {
        log.debug("considering drag");
        e.consume();

        //If they are holding down the control key, COPY rather than MOVE
        int ctrlMask = InputEvent.CTRL_DOWN_MASK;
        int action = e.isControlDown() ? TransferHandler.COPY : TransferHandler.MOVE;

        int dx = Math.abs(e.getX() - firstMouseEvent.getX());
        int dy = Math.abs(e.getY() - firstMouseEvent.getY());
        //Arbitrarily define a 5-pixel shift as the
        //official beginning of a drag.
        if (dx > 5 || dy > 5) {
            log.debug("Start a drag");
            //This is a drag, not a click.
            JComponent c = (JComponent) e.getSource();
            //Tell the transfer handler to initiate the drag.
            TransferHandler handler = c.getTransferHandler();
            handler.exportAsDrag(c, firstMouseEvent, action);
            firstMouseEvent = null;
        }
    }
}