| /* |
| * Copyright (c) 2003, 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.X11; |
| |
| import java.awt.Toolkit; |
| import java.awt.Component; |
| |
| import java.awt.Point; |
| import java.awt.dnd.DnDConstants; |
| import java.awt.dnd.DragSource; |
| import java.awt.dnd.MouseDragGestureRecognizer; |
| import java.awt.dnd.DragGestureListener; |
| |
| import java.awt.event.InputEvent; |
| import java.awt.event.MouseEvent; |
| |
| import sun.awt.dnd.SunDragSourceContextPeer; |
| |
| /** |
| * <p> |
| * This subclass of MouseDragGestureRecognizer defines a DragGestureRecognizer |
| * for Mouse based gestures on OSF/Motif. |
| * </p> |
| * |
| * @author Laurence P. G. Cable |
| * |
| * @see java.awt.dnd.DragGestureListener |
| * @see java.awt.dnd.DragGestureEvent |
| * @see java.awt.dnd.DragSource |
| */ |
| |
| class XMouseDragGestureRecognizer extends MouseDragGestureRecognizer { |
| |
| private static final long serialVersionUID = -841711780352520383L; |
| |
| /* |
| * constant for number of pixels hysterisis before drag is determined |
| * to have started |
| */ |
| |
| protected static int motionThreshold; |
| |
| |
| protected static final int ButtonMask = InputEvent.BUTTON1_DOWN_MASK | |
| InputEvent.BUTTON2_DOWN_MASK | |
| InputEvent.BUTTON3_DOWN_MASK; |
| |
| /** |
| * construct a new XMouseDragGestureRecognizer |
| * |
| * @param ds The DragSource for the Component c |
| * @param c The Component to observe |
| * @param act The actions permitted for this Drag |
| * @param dgl The DragGestureRecognizer to notify when a gesture is detected |
| * |
| */ |
| |
| protected XMouseDragGestureRecognizer(DragSource ds, Component c, int act, DragGestureListener dgl) { |
| super(ds, c, act, dgl); |
| } |
| |
| /** |
| * construct a new XMouseDragGestureRecognizer |
| * |
| * @param ds The DragSource for the Component c |
| * @param c The Component to observe |
| * @param act The actions permitted for this Drag |
| */ |
| |
| protected XMouseDragGestureRecognizer(DragSource ds, Component c, int act) { |
| this(ds, c, act, null); |
| } |
| |
| /** |
| * construct a new XMouseDragGestureRecognizer |
| * |
| * @param ds The DragSource for the Component c |
| * @param c The Component to observe |
| */ |
| |
| protected XMouseDragGestureRecognizer(DragSource ds, Component c) { |
| this(ds, c, DnDConstants.ACTION_NONE); |
| } |
| |
| /** |
| * construct a new XMouseDragGestureRecognizer |
| * |
| * @param ds The DragSource for the Component c |
| */ |
| |
| protected XMouseDragGestureRecognizer(DragSource ds) { |
| this(ds, null); |
| } |
| |
| /** |
| * determine the drop action from the event |
| */ |
| |
| protected int mapDragOperationFromModifiers(MouseEvent e) { |
| int mods = e.getModifiersEx(); |
| int btns = mods & ButtonMask; |
| |
| // Do not allow right mouse button drag since Motif DnD does not |
| // terminate drag operation on right mouse button release. |
| if (!(btns == InputEvent.BUTTON1_DOWN_MASK || |
| btns == InputEvent.BUTTON2_DOWN_MASK)) { |
| return DnDConstants.ACTION_NONE; |
| } |
| |
| return |
| SunDragSourceContextPeer.convertModifiersToDropAction(mods, |
| getSourceActions()); |
| } |
| |
| /** |
| * Invoked when the mouse has been clicked on a component. |
| */ |
| |
| public void mouseClicked(MouseEvent e) { |
| // do nothing |
| } |
| |
| /** |
| * Invoked when a mouse button has been pressed on a component. |
| */ |
| |
| public void mousePressed(MouseEvent e) { |
| events.clear(); |
| |
| if (mapDragOperationFromModifiers(e) != DnDConstants.ACTION_NONE) { |
| try { |
| motionThreshold = DragSource.getDragThreshold(); |
| } catch (Exception exc) { |
| motionThreshold = 5; |
| } |
| appendEvent(e); |
| } |
| } |
| |
| /** |
| * Invoked when a mouse button has been released on a component. |
| */ |
| |
| public void mouseReleased(MouseEvent e) { |
| events.clear(); |
| } |
| |
| /** |
| * Invoked when the mouse enters a component. |
| */ |
| |
| public void mouseEntered(MouseEvent e) { |
| events.clear(); |
| } |
| |
| /** |
| * Invoked when the mouse exits a component. |
| */ |
| |
| public void mouseExited(MouseEvent e) { |
| if (!events.isEmpty()) { // gesture pending |
| int dragAction = mapDragOperationFromModifiers(e); |
| |
| if (dragAction == DnDConstants.ACTION_NONE) { |
| events.clear(); |
| } |
| } |
| } |
| |
| /** |
| * Invoked when a mouse button is pressed on a component. |
| */ |
| |
| public void mouseDragged(MouseEvent e) { |
| if (!events.isEmpty()) { // gesture pending |
| int dop = mapDragOperationFromModifiers(e); |
| |
| |
| if (dop == DnDConstants.ACTION_NONE) { |
| return; |
| } |
| |
| MouseEvent trigger = (MouseEvent)events.get(0); |
| |
| Point origin = trigger.getPoint(); |
| Point current = e.getPoint(); |
| |
| int dx = Math.abs(origin.x - current.x); |
| int dy = Math.abs(origin.y - current.y); |
| |
| if (dx > motionThreshold || dy > motionThreshold) { |
| fireDragGestureRecognized(dop, ((MouseEvent)getTriggerEvent()).getPoint()); |
| } else |
| appendEvent(e); |
| } |
| } |
| |
| /** |
| * Invoked when the mouse button has been moved on a component |
| * (with no buttons no down). |
| */ |
| |
| public void mouseMoved(MouseEvent e) { |
| // do nothing |
| } |
| } |