private void initialize() {
// install drag n drop support
dragSource = DragSource.getDefaultDragSource();
dgRecognizer =
dragSource.createDefaultDragGestureRecognizer(this, DnDConstants.ACTION_MOVE, this);
// don't act on right mouse button
dgRecognizer.setSourceActions(
dgRecognizer.getSourceActions() & ~InputEvent.BUTTON3_MASK & ~InputEvent.BUTTON2_MASK);
new DropTarget(this, new CDropTargetListener());
}
/** convenience routine for setting up drag and drop */
private void setupDnD() {
// gesture recognizer establishes what action starts the dnd
DragGestureRecognizer dgr =
dragSource.createDefaultDragGestureRecognizer(
this, // DragSource
DnDConstants.ACTION_COPY, // specifies valid actions
this // DragGestureListener
);
/*
* Eliminates right mouse clicks as valid actions - useful especially if
* you implement a JPopupMenu for the JTree
*/
dgr.setSourceActions(dgr.getSourceActions() & ~InputEvent.BUTTON3_MASK);
}
protected void enableDragging() {
dgr.setComponent(this);
/**
* FIX for bug where element is not draggable when initial click begins on label
*
* <p>There is a big trick here: the label view is not a subcomponent of view, so dragging on
* this component will not be seen by palette element view, so we need here to force disable
* mouse listeners registered for this palette view
*/
if (getLabelView() != null) {
if (labelDgr == null) {
labelDgr = createDragGestureRecognizer();
}
getLabelView().disableTextComponentMouseListeners();
labelDgr.setComponent(getLabelView().getTextComponent());
}
}
protected void disableDragging() {
// dgr.setComponent(null);
if (getLabelView() != null) {
getLabelView().enableTextComponentMouseListeners();
}
if (labelDgr != null) {
labelDgr.setComponent(null);
}
}