| /* |
| * Copyright (c) 2000, 2009, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| package sun.awt.dnd; |
| |
| import java.awt.AWTEvent; |
| import java.awt.Component; |
| import java.awt.Cursor; |
| import java.awt.EventQueue; |
| import java.awt.Image; |
| import java.awt.Point; |
| |
| import java.awt.datatransfer.Transferable; |
| |
| import java.awt.dnd.DnDConstants; |
| import java.awt.dnd.DragSourceContext; |
| import java.awt.dnd.DragSourceEvent; |
| import java.awt.dnd.DragSourceDropEvent; |
| import java.awt.dnd.DragSourceDragEvent; |
| import java.awt.dnd.DragGestureEvent; |
| import java.awt.dnd.InvalidDnDOperationException; |
| |
| import java.awt.dnd.peer.DragSourceContextPeer; |
| |
| import java.awt.event.InputEvent; |
| import java.awt.event.MouseEvent; |
| |
| import java.util.Map; |
| import java.util.SortedMap; |
| |
| import sun.awt.SunToolkit; |
| import sun.awt.datatransfer.DataTransferer; |
| |
| /** |
| * <p> |
| * TBC |
| * </p> |
| * |
| * @since JDK1.3.1 |
| * |
| */ |
| |
| public abstract class SunDragSourceContextPeer implements DragSourceContextPeer { |
| |
| private DragGestureEvent trigger; |
| private Component component; |
| private Cursor cursor; |
| private Image dragImage; |
| private Point dragImageOffset; |
| private long nativeCtxt; |
| private DragSourceContext dragSourceContext; |
| private int sourceActions; |
| |
| private static boolean dragDropInProgress = false; |
| private static boolean discardingMouseEvents = false; |
| |
| /* |
| * dispatch constants |
| */ |
| |
| protected final static int DISPATCH_ENTER = 1; |
| protected final static int DISPATCH_MOTION = 2; |
| protected final static int DISPATCH_CHANGED = 3; |
| protected final static int DISPATCH_EXIT = 4; |
| protected final static int DISPATCH_FINISH = 5; |
| protected final static int DISPATCH_MOUSE_MOVED = 6; |
| |
| /** |
| * construct a new SunDragSourceContextPeer |
| */ |
| |
| public SunDragSourceContextPeer(DragGestureEvent dge) { |
| trigger = dge; |
| if (trigger != null) { |
| component = trigger.getComponent(); |
| } else { |
| component = null; |
| } |
| } |
| |
| /** |
| * Synchro messages in AWT |
| */ |
| public void startSecondaryEventLoop(){} |
| public void quitSecondaryEventLoop(){} |
| |
| /** |
| * initiate a DnD operation ... |
| */ |
| |
| public void startDrag(DragSourceContext dsc, Cursor c, Image di, Point p) |
| throws InvalidDnDOperationException { |
| |
| /* Fix for 4354044: don't initiate a drag if event sequence provided by |
| * DragGestureRecognizer is empty */ |
| if (getTrigger().getTriggerEvent() == null) { |
| throw new InvalidDnDOperationException("DragGestureEvent has a null trigger"); |
| } |
| |
| dragSourceContext = dsc; |
| cursor = c; |
| sourceActions = getDragSourceContext().getSourceActions(); |
| dragImage = di; |
| dragImageOffset = p; |
| |
| Transferable transferable = getDragSourceContext().getTransferable(); |
| SortedMap formatMap = DataTransferer.getInstance().getFormatsForTransferable |
| (transferable, DataTransferer.adaptFlavorMap |
| (getTrigger().getDragSource().getFlavorMap())); |
| long[] formats = DataTransferer.getInstance(). |
| keysToLongArray(formatMap); |
| startDrag(transferable, formats, formatMap); |
| |
| /* |
| * Fix for 4613903. |
| * Filter out all mouse events that are currently on the event queue. |
| */ |
| discardingMouseEvents = true; |
| EventQueue.invokeLater(new Runnable() { |
| public void run() { |
| discardingMouseEvents = false; |
| } |
| }); |
| } |
| |
| protected abstract void startDrag(Transferable trans, |
| long[] formats, Map formatMap); |
| |
| /** |
| * set cursor |
| */ |
| |
| public void setCursor(Cursor c) throws InvalidDnDOperationException { |
| synchronized (this) { |
| if (cursor == null || !cursor.equals(c)) { |
| cursor = c; |
| // NOTE: native context can be null at this point. |
| // setNativeCursor() should handle it properly. |
| setNativeCursor(getNativeContext(), c, |
| c != null ? c.getType() : 0); |
| } |
| } |
| } |
| |
| /** |
| * return cursor |
| */ |
| |
| public Cursor getCursor() { |
| return cursor; |
| } |
| |
| /** |
| * Returns the drag image. If there is no image to drag, |
| * the returned value is {@code null} |
| * |
| * @return the reference to the drag image |
| */ |
| public Image getDragImage() { |
| return dragImage; |
| } |
| |
| /** |
| * Returns an anchor offset for the image to drag. |
| * |
| * @return a {@code Point} object that corresponds |
| * to coordinates of an anchor offset of the image |
| * relative to the upper left corner of the image. |
| * The point {@code (0,0)} returns by default. |
| */ |
| public Point getDragImageOffset() { |
| if (dragImageOffset == null) { |
| return new Point(0,0); |
| } |
| return new Point(dragImageOffset); |
| } |
| |
| /** |
| * downcall into native code |
| */ |
| |
| |
| protected abstract void setNativeCursor(long nativeCtxt, Cursor c, |
| int cType); |
| |
| protected synchronized void setTrigger(DragGestureEvent dge) { |
| trigger = dge; |
| if (trigger != null) { |
| component = trigger.getComponent(); |
| } else { |
| component = null; |
| } |
| } |
| |
| protected DragGestureEvent getTrigger() { |
| return trigger; |
| } |
| |
| protected Component getComponent() { |
| return component; |
| } |
| |
| protected synchronized void setNativeContext(long ctxt) { |
| nativeCtxt = ctxt; |
| } |
| |
| protected synchronized long getNativeContext() { |
| return nativeCtxt; |
| } |
| |
| protected DragSourceContext getDragSourceContext() { |
| return dragSourceContext; |
| } |
| |
| /** |
| * Notify the peer that the transferables' DataFlavors have changed. |
| * |
| * No longer useful as the transferables are determined at the time |
| * of the drag. |
| */ |
| |
| public void transferablesFlavorsChanged() { |
| } |
| |
| |
| |
| |
| |
| protected final void postDragSourceDragEvent(final int targetAction, |
| final int modifiers, |
| final int x, final int y, |
| final int dispatchType) { |
| |
| final int dropAction = |
| SunDragSourceContextPeer.convertModifiersToDropAction(modifiers, |
| sourceActions); |
| |
| DragSourceDragEvent event = |
| new DragSourceDragEvent(getDragSourceContext(), |
| dropAction, |
| targetAction & sourceActions, |
| modifiers, x, y); |
| EventDispatcher dispatcher = new EventDispatcher(dispatchType, event); |
| |
| SunToolkit.invokeLaterOnAppContext( |
| SunToolkit.targetToAppContext(getComponent()), dispatcher); |
| |
| startSecondaryEventLoop(); |
| } |
| |
| /** |
| * upcall from native code |
| */ |
| |
| private void dragEnter(final int targetActions, |
| final int modifiers, |
| final int x, final int y) { |
| postDragSourceDragEvent(targetActions, modifiers, x, y, DISPATCH_ENTER); |
| } |
| |
| /** |
| * upcall from native code |
| */ |
| |
| private void dragMotion(final int targetActions, |
| final int modifiers, |
| final int x, final int y) { |
| postDragSourceDragEvent(targetActions, modifiers, x, y, DISPATCH_MOTION); |
| } |
| |
| /** |
| * upcall from native code |
| */ |
| |
| private void operationChanged(final int targetActions, |
| final int modifiers, |
| final int x, final int y) { |
| postDragSourceDragEvent(targetActions, modifiers, x, y, DISPATCH_CHANGED); |
| } |
| |
| /** |
| * upcall from native code |
| */ |
| |
| protected final void dragExit(final int x, final int y) { |
| DragSourceEvent event = |
| new DragSourceEvent(getDragSourceContext(), x, y); |
| EventDispatcher dispatcher = |
| new EventDispatcher(DISPATCH_EXIT, event); |
| |
| SunToolkit.invokeLaterOnAppContext( |
| SunToolkit.targetToAppContext(getComponent()), dispatcher); |
| |
| startSecondaryEventLoop(); |
| } |
| |
| /** |
| * upcall from native code |
| */ |
| |
| private void dragMouseMoved(final int targetActions, |
| final int modifiers, |
| final int x, final int y) { |
| postDragSourceDragEvent(targetActions, modifiers, x, y, |
| DISPATCH_MOUSE_MOVED); |
| } |
| |
| /** |
| * upcall from native code via implemented class (do) |
| */ |
| |
| protected final void dragDropFinished(final boolean success, |
| final int operations, |
| final int x, final int y) { |
| DragSourceEvent event = |
| new DragSourceDropEvent(getDragSourceContext(), |
| operations & sourceActions, |
| success, x, y); |
| EventDispatcher dispatcher = |
| new EventDispatcher(DISPATCH_FINISH, event); |
| |
| SunToolkit.invokeLaterOnAppContext( |
| SunToolkit.targetToAppContext(getComponent()), dispatcher); |
| |
| startSecondaryEventLoop(); |
| setNativeContext(0); |
| dragImage = null; |
| dragImageOffset = null; |
| } |
| |
| public static void setDragDropInProgress(boolean b) |
| throws InvalidDnDOperationException { |
| if (dragDropInProgress == b) { |
| throw new InvalidDnDOperationException(getExceptionMessage(b)); |
| } |
| |
| synchronized (SunDragSourceContextPeer.class) { |
| if (dragDropInProgress == b) { |
| throw new InvalidDnDOperationException(getExceptionMessage(b)); |
| } |
| dragDropInProgress = b; |
| } |
| } |
| |
| /** |
| * Filters out all mouse events that were on the java event queue when |
| * startDrag was called. |
| */ |
| public static boolean checkEvent(AWTEvent event) { |
| if (discardingMouseEvents && event instanceof MouseEvent) { |
| MouseEvent mouseEvent = (MouseEvent)event; |
| if (!(mouseEvent instanceof SunDropTargetEvent)) { |
| return false; |
| } |
| } |
| return true; |
| } |
| |
| public static void checkDragDropInProgress() |
| throws InvalidDnDOperationException { |
| if (dragDropInProgress) { |
| throw new InvalidDnDOperationException(getExceptionMessage(true)); |
| } |
| } |
| |
| private static String getExceptionMessage(boolean b) { |
| return b ? "Drag and drop in progress" : "No drag in progress"; |
| } |
| |
| public static int convertModifiersToDropAction(final int modifiers, |
| final int supportedActions) { |
| int dropAction = DnDConstants.ACTION_NONE; |
| |
| /* |
| * Fix for 4285634. |
| * Calculate the drop action to match Motif DnD behavior. |
| * If the user selects an operation (by pressing a modifier key), |
| * return the selected operation or ACTION_NONE if the selected |
| * operation is not supported by the drag source. |
| * If the user doesn't select an operation search the set of operations |
| * supported by the drag source for ACTION_MOVE, then for |
| * ACTION_COPY, then for ACTION_LINK and return the first operation |
| * found. |
| */ |
| switch (modifiers & (InputEvent.SHIFT_DOWN_MASK | |
| InputEvent.CTRL_DOWN_MASK)) { |
| case InputEvent.SHIFT_DOWN_MASK | InputEvent.CTRL_DOWN_MASK: |
| dropAction = DnDConstants.ACTION_LINK; break; |
| case InputEvent.CTRL_DOWN_MASK: |
| dropAction = DnDConstants.ACTION_COPY; break; |
| case InputEvent.SHIFT_DOWN_MASK: |
| dropAction = DnDConstants.ACTION_MOVE; break; |
| default: |
| if ((supportedActions & DnDConstants.ACTION_MOVE) != 0) { |
| dropAction = DnDConstants.ACTION_MOVE; |
| } else if ((supportedActions & DnDConstants.ACTION_COPY) != 0) { |
| dropAction = DnDConstants.ACTION_COPY; |
| } else if ((supportedActions & DnDConstants.ACTION_LINK) != 0) { |
| dropAction = DnDConstants.ACTION_LINK; |
| } |
| } |
| |
| return dropAction & supportedActions; |
| } |
| |
| private void cleanup() { |
| trigger = null; |
| component = null; |
| cursor = null; |
| dragSourceContext = null; |
| SunDropTargetContextPeer.setCurrentJVMLocalSourceTransferable(null); |
| SunDragSourceContextPeer.setDragDropInProgress(false); |
| } |
| |
| private class EventDispatcher implements Runnable { |
| |
| private final int dispatchType; |
| |
| private final DragSourceEvent event; |
| |
| EventDispatcher(int dispatchType, DragSourceEvent event) { |
| switch (dispatchType) { |
| case DISPATCH_ENTER: |
| case DISPATCH_MOTION: |
| case DISPATCH_CHANGED: |
| case DISPATCH_MOUSE_MOVED: |
| if (!(event instanceof DragSourceDragEvent)) { |
| throw new IllegalArgumentException("Event: " + event); |
| } |
| break; |
| case DISPATCH_EXIT: |
| break; |
| case DISPATCH_FINISH: |
| if (!(event instanceof DragSourceDropEvent)) { |
| throw new IllegalArgumentException("Event: " + event); |
| } |
| break; |
| default: |
| throw new IllegalArgumentException("Dispatch type: " + |
| dispatchType); |
| } |
| |
| this.dispatchType = dispatchType; |
| this.event = event; |
| } |
| |
| public void run() { |
| DragSourceContext dragSourceContext = |
| SunDragSourceContextPeer.this.getDragSourceContext(); |
| try { |
| switch (dispatchType) { |
| case DISPATCH_ENTER: |
| dragSourceContext.dragEnter((DragSourceDragEvent)event); |
| break; |
| case DISPATCH_MOTION: |
| dragSourceContext.dragOver((DragSourceDragEvent)event); |
| break; |
| case DISPATCH_CHANGED: |
| dragSourceContext.dropActionChanged((DragSourceDragEvent)event); |
| break; |
| case DISPATCH_EXIT: |
| dragSourceContext.dragExit(event); |
| break; |
| case DISPATCH_MOUSE_MOVED: |
| dragSourceContext.dragMouseMoved((DragSourceDragEvent)event); |
| break; |
| case DISPATCH_FINISH: |
| try { |
| dragSourceContext.dragDropEnd((DragSourceDropEvent)event); |
| } finally { |
| SunDragSourceContextPeer.this.cleanup(); |
| } |
| break; |
| default: |
| throw new IllegalStateException("Dispatch type: " + |
| dispatchType); |
| } |
| } finally { |
| SunDragSourceContextPeer.this.quitSecondaryEventLoop(); |
| } |
| } |
| } |
| } |
