void updateState(MouseEvent event) {
if (isOld(event)) return;
// childAt and locationOnScreenOf want the tree lock, so be careful not to use any additional
// locks at the same time
// to avoid deadlock.
Point eventScreenLocation = null;
// Determine the current mouse position in screen coordinates
try {
eventScreenLocation = locationOnScreenOf(event.getComponent());
} catch (IllegalComponentStateException e) {
// component might be hidden by the time we process this event
} catch (UnexpectedException e) {
if (!(e.getCause() instanceof IllegalComponentStateException)) throw e;
}
synchronized (this) {
lastEventTime(event);
dragDropInfo.update(event);
mouseInfo.modifiers(modifiers);
mouseInfo.update(event, eventScreenLocation);
modifiers(mouseInfo.modifiers());
}
}
public synchronized void clear() {
mouseInfo.clear();
dragDropInfo.clear();
modifiers = 0;
lastEventTime = 0;
}
/**
* Indicates whether there is a native drag/drop operation in progress.
*
* @return <code>true</code> if there is a native drag/drop operation in progress, <code>false
* </code> otherwise.
*/
public boolean isNativeDragActive() {
return dragDropInfo.isNativeDragActive();
}
/**
* Returns the coordinates where a drag operation started.
*
* @return the coordinates where a drag operation started.
*/
public synchronized Point dragOrigin() {
return dragDropInfo.origin();
}
/**
* Returns the <code>{@link Component}</code> where a drag operation started.
*
* @return the <code>Component</code> where a drag operation started.
*/
public synchronized Component dragSource() {
return dragDropInfo.source();
}
/**
* Indicates there is a drag operation in progress.
*
* @return <code>true</code> if there is a drag operation in progress, <code>false</code>
* otherwise.
*/
public synchronized boolean dragInProgress() {
return dragDropInfo.isDragging();
}