/*
* Created on Apr 3, 2008
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on
* an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the
* specific language governing permissions and limitations under the License.
*
* Copyright @2008-2013 the original author or authors.
*/
package org.fest.swing.input;
import static java.awt.AWTEvent.MOUSE_EVENT_MASK;
import static java.awt.AWTEvent.MOUSE_MOTION_EVENT_MASK;
import static java.awt.event.MouseEvent.MOUSE_DRAGGED;
import static java.awt.event.MouseEvent.MOUSE_FIRST;
import static java.awt.event.MouseEvent.MOUSE_LAST;
import static java.awt.event.MouseEvent.MOUSE_MOVED;
import static javax.swing.SwingUtilities.convertMouseEvent;
import static javax.swing.SwingUtilities.getDeepestComponentAt;
import java.awt.AWTEvent;
import java.awt.Component;
import java.awt.EventQueue;
import java.awt.Toolkit;
import java.awt.event.AWTEventListener;
import java.awt.event.MouseEvent;
import java.util.EmptyStackException;
import javax.annotation.Nonnull;
/**
* Catches native drop target events, which are normally hidden from AWTEventListeners.
*
* @author Alex Ruiz
*/
class DragAwareEventQueue extends EventQueue {
private final Toolkit toolkit;
private final long mask;
private final AWTEventListener eventListener;
private final NativeDndIdentifier nativeDnd;
DragAwareEventQueue(@Nonnull Toolkit toolkit, long mask, @Nonnull AWTEventListener eventListener) {
this(toolkit, mask, eventListener, new NativeDndIdentifier());
}
DragAwareEventQueue(@Nonnull Toolkit toolkit, long mask, @Nonnull AWTEventListener eventListener,
@Nonnull NativeDndIdentifier nativeDnd) {
this.toolkit = toolkit;
this.mask = mask;
this.eventListener = eventListener;
this.nativeDnd = nativeDnd;
}
/**
* Stops dispatching events using this {@code EventQueue}, only if this {@code EventQueue} is the same as the
* {@code Toolkit}'s system event queue. Any pending events are transferred to the previous {@code EventQueue} for
* processing.
*
* @throws EmptyStackException if no previous push was made on this {@code EventQueue}.
*/
@Override
public void pop() throws EmptyStackException {
EventQueue systemEventQueue = toolkit.getSystemEventQueue();
if (systemEventQueue == this) {
super.pop();
}
}
/**
* Dispatch native drag/drop events the same way non-native drags are reported. Enter/Exit are reported with the
* appropriate source, while drag and release events use the drag source as the source.
*
* @param e an AWT event.
*/
@Override
protected void dispatchEvent(AWTEvent e) {
// TODO: implement enter/exit events
// TODO: change source to drag source, not mouse under
if (nativeDnd.isNativeDragAndDrop(e)) {
MouseEvent mouseEvent = (MouseEvent) e;
Component target = getDeepestComponentAt(mouseEvent.getComponent(), mouseEvent.getX(), mouseEvent.getY());
if (target != mouseEvent.getSource()) {
mouseEvent = convertMouseEvent(mouseEvent.getComponent(), mouseEvent, target);
}
relayDndEvent(mouseEvent);
}
super.dispatchEvent(e);
}
private void relayDndEvent(@Nonnull MouseEvent event) {
int eventId = event.getID();
if (eventId == MOUSE_MOVED || eventId == MOUSE_DRAGGED) {
if ((mask & MOUSE_MOTION_EVENT_MASK) != 0) {
eventListener.eventDispatched(event);
}
return;
}
if (eventId >= MOUSE_FIRST && eventId <= MOUSE_LAST) {
if ((mask & MOUSE_EVENT_MASK) != 0) {
eventListener.eventDispatched(event);
}
}
}
}