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/*
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* Copyright 2000-2007 Sun Microsystems, Inc. All Rights Reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Sun designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Sun in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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* CA 95054 USA or visit www.sun.com if you need additional information or
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* have any questions.
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*/
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package sun.awt.dnd;
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import java.awt.AWTEvent;
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import java.awt.Component;
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import java.awt.Cursor;
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import java.awt.EventQueue;
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import java.awt.Image;
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import java.awt.Point;
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import java.awt.datatransfer.Transferable;
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import java.awt.dnd.DnDConstants;
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import java.awt.dnd.DragSourceContext;
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import java.awt.dnd.DragSourceEvent;
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import java.awt.dnd.DragSourceDropEvent;
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import java.awt.dnd.DragSourceDragEvent;
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import java.awt.dnd.DragGestureEvent;
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import java.awt.dnd.InvalidDnDOperationException;
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import java.awt.dnd.peer.DragSourceContextPeer;
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import java.awt.event.InputEvent;
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import java.awt.event.MouseEvent;
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import java.util.Map;
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import java.util.SortedMap;
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import sun.awt.SunToolkit;
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import sun.awt.datatransfer.DataTransferer;
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/**
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* <p>
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* TBC
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* </p>
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*
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* @since JDK1.3.1
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*
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*/
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public abstract class SunDragSourceContextPeer implements DragSourceContextPeer {
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private DragGestureEvent trigger;
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private Component component;
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private Cursor cursor;
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private long nativeCtxt;
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private DragSourceContext dragSourceContext;
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private int sourceActions;
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private static boolean dragDropInProgress = false;
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private static boolean discardingMouseEvents = false;
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/*
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* dispatch constants
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*/
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protected final static int DISPATCH_ENTER = 1;
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protected final static int DISPATCH_MOTION = 2;
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protected final static int DISPATCH_CHANGED = 3;
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protected final static int DISPATCH_EXIT = 4;
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protected final static int DISPATCH_FINISH = 5;
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protected final static int DISPATCH_MOUSE_MOVED = 6;
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/**
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* construct a new SunDragSourceContextPeer
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*/
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public SunDragSourceContextPeer(DragGestureEvent dge) {
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trigger = dge;
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if (trigger != null) {
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component = trigger.getComponent();
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} else {
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component = null;
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}
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}
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/**
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* Synchro messages in AWT
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*/
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public void startSecondaryEventLoop(){}
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public void quitSecondaryEventLoop(){}
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/**
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* initiate a DnD operation ...
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*/
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public void startDrag(DragSourceContext dsc, Cursor c, Image di, Point p)
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throws InvalidDnDOperationException {
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/* Fix for 4354044: don't initiate a drag if event sequence provided by
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* DragGestureRecognizer is empty */
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if (getTrigger().getTriggerEvent() == null) {
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throw new InvalidDnDOperationException("DragGestureEvent has a null trigger");
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}
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dragSourceContext = dsc;
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cursor = c;
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sourceActions = getDragSourceContext().getSourceActions();
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Transferable transferable = getDragSourceContext().getTransferable();
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SortedMap formatMap = DataTransferer.getInstance().getFormatsForTransferable
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(transferable, DataTransferer.adaptFlavorMap
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(getTrigger().getDragSource().getFlavorMap()));
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long[] formats = DataTransferer.getInstance().
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keysToLongArray(formatMap);
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startDrag(transferable, formats, formatMap);
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/*
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* Fix for 4613903.
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* Filter out all mouse events that are currently on the event queue.
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*/
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discardingMouseEvents = true;
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EventQueue.invokeLater(new Runnable() {
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public void run() {
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discardingMouseEvents = false;
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}
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});
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}
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protected abstract void startDrag(Transferable trans,
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long[] formats, Map formatMap);
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/**
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* set cursor
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*/
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public void setCursor(Cursor c) throws InvalidDnDOperationException {
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synchronized (this) {
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if (cursor == null || !cursor.equals(c)) {
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cursor = c;
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// NOTE: native context can be null at this point.
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// setNativeCursor() should handle it properly.
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setNativeCursor(getNativeContext(), c,
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c != null ? c.getType() : 0);
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}
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}
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}
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/**
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* return cursor
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*/
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public Cursor getCursor() {
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return cursor;
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}
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/**
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* downcall into native code
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*/
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protected abstract void setNativeCursor(long nativeCtxt, Cursor c,
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int cType);
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protected synchronized void setTrigger(DragGestureEvent dge) {
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trigger = dge;
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if (trigger != null) {
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component = trigger.getComponent();
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} else {
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component = null;
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}
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}
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protected DragGestureEvent getTrigger() {
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return trigger;
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}
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protected Component getComponent() {
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return component;
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}
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protected synchronized void setNativeContext(long ctxt) {
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nativeCtxt = ctxt;
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}
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protected synchronized long getNativeContext() {
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return nativeCtxt;
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}
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protected DragSourceContext getDragSourceContext() {
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return dragSourceContext;
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}
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/**
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* Notify the peer that the transferables' DataFlavors have changed.
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*
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* No longer useful as the transferables are determined at the time
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* of the drag.
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*/
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public void transferablesFlavorsChanged() {
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}
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protected final void postDragSourceDragEvent(final int targetAction,
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final int modifiers,
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final int x, final int y,
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final int dispatchType) {
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final int dropAction =
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SunDragSourceContextPeer.convertModifiersToDropAction(modifiers,
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sourceActions);
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DragSourceDragEvent event =
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new DragSourceDragEvent(getDragSourceContext(),
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dropAction,
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targetAction & sourceActions,
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modifiers, x, y);
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EventDispatcher dispatcher = new EventDispatcher(dispatchType, event);
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SunToolkit.invokeLaterOnAppContext(
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SunToolkit.targetToAppContext(getComponent()), dispatcher);
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startSecondaryEventLoop();
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}
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/**
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* upcall from native code
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*/
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private void dragEnter(final int targetActions,
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final int modifiers,
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final int x, final int y) {
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postDragSourceDragEvent(targetActions, modifiers, x, y, DISPATCH_ENTER);
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}
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/**
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* upcall from native code
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*/
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private void dragMotion(final int targetActions,
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final int modifiers,
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final int x, final int y) {
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postDragSourceDragEvent(targetActions, modifiers, x, y, DISPATCH_MOTION);
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}
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/**
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* upcall from native code
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*/
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private void operationChanged(final int targetActions,
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final int modifiers,
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final int x, final int y) {
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postDragSourceDragEvent(targetActions, modifiers, x, y, DISPATCH_CHANGED);
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}
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/**
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* upcall from native code
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*/
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protected final void dragExit(final int x, final int y) {
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DragSourceEvent event =
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new DragSourceEvent(getDragSourceContext(), x, y);
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EventDispatcher dispatcher =
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new EventDispatcher(DISPATCH_EXIT, event);
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SunToolkit.invokeLaterOnAppContext(
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SunToolkit.targetToAppContext(getComponent()), dispatcher);
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startSecondaryEventLoop();
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}
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/**
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* upcall from native code
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*/
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private void dragMouseMoved(final int targetActions,
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final int modifiers,
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final int x, final int y) {
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postDragSourceDragEvent(targetActions, modifiers, x, y,
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DISPATCH_MOUSE_MOVED);
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}
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/**
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* upcall from native code via implemented class (do)
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*/
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protected final void dragDropFinished(final boolean success,
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final int operations,
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final int x, final int y) {
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DragSourceEvent event =
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new DragSourceDropEvent(getDragSourceContext(),
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operations & sourceActions,
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success, x, y);
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EventDispatcher dispatcher =
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new EventDispatcher(DISPATCH_FINISH, event);
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SunToolkit.invokeLaterOnAppContext(
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SunToolkit.targetToAppContext(getComponent()), dispatcher);
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startSecondaryEventLoop();
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setNativeContext(0);
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}
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public static void setDragDropInProgress(boolean b)
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throws InvalidDnDOperationException {
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if (dragDropInProgress == b) {
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throw new InvalidDnDOperationException(getExceptionMessage(b));
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}
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synchronized (SunDragSourceContextPeer.class) {
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if (dragDropInProgress == b) {
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throw new InvalidDnDOperationException(getExceptionMessage(b));
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}
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dragDropInProgress = b;
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}
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}
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/**
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* Filters out all mouse events that were on the java event queue when
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* startDrag was called.
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*/
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public static boolean checkEvent(AWTEvent event) {
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if (discardingMouseEvents && event instanceof MouseEvent) {
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MouseEvent mouseEvent = (MouseEvent)event;
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if (!(mouseEvent instanceof SunDropTargetEvent)) {
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return false;
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}
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}
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return true;
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}
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public static void checkDragDropInProgress()
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throws InvalidDnDOperationException {
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if (dragDropInProgress) {
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throw new InvalidDnDOperationException(getExceptionMessage(true));
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}
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}
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private static String getExceptionMessage(boolean b) {
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return b ? "Drag and drop in progress" : "No drag in progress";
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}
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public static int convertModifiersToDropAction(final int modifiers,
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final int supportedActions) {
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int dropAction = DnDConstants.ACTION_NONE;
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/*
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* Fix for 4285634.
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* Calculate the drop action to match Motif DnD behavior.
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* If the user selects an operation (by pressing a modifier key),
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* return the selected operation or ACTION_NONE if the selected
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* operation is not supported by the drag source.
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* If the user doesn't select an operation search the set of operations
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* supported by the drag source for ACTION_MOVE, then for
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* ACTION_COPY, then for ACTION_LINK and return the first operation
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* found.
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*/
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switch (modifiers & (InputEvent.SHIFT_DOWN_MASK |
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InputEvent.CTRL_DOWN_MASK)) {
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case InputEvent.SHIFT_DOWN_MASK | InputEvent.CTRL_DOWN_MASK:
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dropAction = DnDConstants.ACTION_LINK; break;
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case InputEvent.CTRL_DOWN_MASK:
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dropAction = DnDConstants.ACTION_COPY; break;
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case InputEvent.SHIFT_DOWN_MASK:
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dropAction = DnDConstants.ACTION_MOVE; break;
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default:
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if ((supportedActions & DnDConstants.ACTION_MOVE) != 0) {
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dropAction = DnDConstants.ACTION_MOVE;
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} else if ((supportedActions & DnDConstants.ACTION_COPY) != 0) {
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dropAction = DnDConstants.ACTION_COPY;
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} else if ((supportedActions & DnDConstants.ACTION_LINK) != 0) {
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dropAction = DnDConstants.ACTION_LINK;
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}
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}
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return dropAction & supportedActions;
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}
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private void cleanup() {
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trigger = null;
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component = null;
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cursor = null;
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dragSourceContext = null;
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SunDropTargetContextPeer.setCurrentJVMLocalSourceTransferable(null);
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SunDragSourceContextPeer.setDragDropInProgress(false);
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}
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private class EventDispatcher implements Runnable {
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private final int dispatchType;
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private final DragSourceEvent event;
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EventDispatcher(int dispatchType, DragSourceEvent event) {
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switch (dispatchType) {
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case DISPATCH_ENTER:
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case DISPATCH_MOTION:
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case DISPATCH_CHANGED:
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case DISPATCH_MOUSE_MOVED:
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if (!(event instanceof DragSourceDragEvent)) {
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throw new IllegalArgumentException("Event: " + event);
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}
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break;
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case DISPATCH_EXIT:
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break;
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case DISPATCH_FINISH:
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if (!(event instanceof DragSourceDropEvent)) {
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throw new IllegalArgumentException("Event: " + event);
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}
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break;
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default:
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throw new IllegalArgumentException("Dispatch type: " +
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dispatchType);
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}
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this.dispatchType = dispatchType;
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this.event = event;
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}
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437 |
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public void run() {
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439 |
DragSourceContext dragSourceContext =
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440 |
SunDragSourceContextPeer.this.getDragSourceContext();
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441 |
try {
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442 |
switch (dispatchType) {
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443 |
case DISPATCH_ENTER:
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dragSourceContext.dragEnter((DragSourceDragEvent)event);
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break;
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case DISPATCH_MOTION:
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dragSourceContext.dragOver((DragSourceDragEvent)event);
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break;
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449 |
case DISPATCH_CHANGED:
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dragSourceContext.dropActionChanged((DragSourceDragEvent)event);
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break;
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case DISPATCH_EXIT:
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453 |
dragSourceContext.dragExit(event);
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454 |
break;
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455 |
case DISPATCH_MOUSE_MOVED:
|
|
456 |
dragSourceContext.dragMouseMoved((DragSourceDragEvent)event);
|
|
457 |
break;
|
|
458 |
case DISPATCH_FINISH:
|
|
459 |
try {
|
|
460 |
dragSourceContext.dragDropEnd((DragSourceDropEvent)event);
|
|
461 |
} finally {
|
|
462 |
SunDragSourceContextPeer.this.cleanup();
|
|
463 |
}
|
|
464 |
break;
|
|
465 |
default:
|
|
466 |
throw new IllegalStateException("Dispatch type: " +
|
|
467 |
dispatchType);
|
|
468 |
}
|
|
469 |
} finally {
|
|
470 |
SunDragSourceContextPeer.this.quitSecondaryEventLoop();
|
|
471 |
}
|
|
472 |
}
|
|
473 |
}
|
|
474 |
}
|