J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 1998-2003 Sun Microsystems, Inc. All Rights Reserved. |
| 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 | * |
| 5 | * This code is free software; you can redistribute it and/or modify it |
| 6 | * under the terms of the GNU General Public License version 2 only, as |
| 7 | * published by the Free Software Foundation. Sun designates this |
| 8 | * particular file as subject to the "Classpath" exception as provided |
| 9 | * by Sun in the LICENSE file that accompanied this code. |
| 10 | * |
| 11 | * This code is distributed in the hope that it will be useful, but WITHOUT |
| 12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| 14 | * version 2 for more details (a copy is included in the LICENSE file that |
| 15 | * accompanied this code). |
| 16 | * |
| 17 | * You should have received a copy of the GNU General Public License version |
| 18 | * 2 along with this work; if not, write to the Free Software Foundation, |
| 19 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| 20 | * |
| 21 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 22 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| 23 | * have any questions. |
| 24 | */ |
| 25 | |
| 26 | package sun.awt.motif; |
| 27 | |
| 28 | import java.awt.Toolkit; |
| 29 | import java.awt.Component; |
| 30 | |
| 31 | import java.awt.Point; |
| 32 | import java.awt.dnd.DnDConstants; |
| 33 | import java.awt.dnd.DragSource; |
| 34 | import java.awt.dnd.MouseDragGestureRecognizer; |
| 35 | import java.awt.dnd.DragGestureListener; |
| 36 | |
| 37 | import java.awt.event.InputEvent; |
| 38 | import java.awt.event.MouseEvent; |
| 39 | import java.awt.event.MouseListener; |
| 40 | import java.awt.event.MouseMotionListener; |
| 41 | |
| 42 | import java.lang.reflect.*; |
| 43 | |
| 44 | import sun.awt.dnd.SunDragSourceContextPeer; |
| 45 | |
| 46 | /** |
| 47 | * <p> |
| 48 | * This subclass of MouseDragGestureRecognizer defines a DragGestureRecognizer |
| 49 | * for Mouse based gestures on OSF/Motif. |
| 50 | * </p> |
| 51 | * |
| 52 | * @author Laurence P. G. Cable |
| 53 | * |
| 54 | * @see java.awt.dnd.DragGestureListener |
| 55 | * @see java.awt.dnd.DragGestureEvent |
| 56 | * @see java.awt.dnd.DragSource |
| 57 | */ |
| 58 | |
| 59 | class MMouseDragGestureRecognizer extends MouseDragGestureRecognizer { |
| 60 | |
| 61 | private static final long serialVersionUID = -841711780352520383L; |
| 62 | |
| 63 | /* |
| 64 | * constant for number of pixels hysterisis before drag is determined |
| 65 | * to have started |
| 66 | */ |
| 67 | |
| 68 | protected static int motionThreshold; |
| 69 | |
| 70 | |
| 71 | protected static final int ButtonMask = InputEvent.BUTTON1_DOWN_MASK | |
| 72 | InputEvent.BUTTON2_DOWN_MASK | |
| 73 | InputEvent.BUTTON3_DOWN_MASK; |
| 74 | |
| 75 | /** |
| 76 | * construct a new MMouseDragGestureRecognizer |
| 77 | * |
| 78 | * @param ds The DragSource for the Component c |
| 79 | * @param c The Component to observe |
| 80 | * @param act The actions permitted for this Drag |
| 81 | * @param dgl The DragGestureRecognizer to notify when a gesture is detected |
| 82 | * |
| 83 | */ |
| 84 | |
| 85 | protected MMouseDragGestureRecognizer(DragSource ds, Component c, int act, DragGestureListener dgl) { |
| 86 | super(ds, c, act, dgl); |
| 87 | } |
| 88 | |
| 89 | /** |
| 90 | * construct a new MMouseDragGestureRecognizer |
| 91 | * |
| 92 | * @param ds The DragSource for the Component c |
| 93 | * @param c The Component to observe |
| 94 | * @param act The actions permitted for this Drag |
| 95 | */ |
| 96 | |
| 97 | protected MMouseDragGestureRecognizer(DragSource ds, Component c, int act) { |
| 98 | this(ds, c, act, null); |
| 99 | } |
| 100 | |
| 101 | /** |
| 102 | * construct a new MMouseDragGestureRecognizer |
| 103 | * |
| 104 | * @param ds The DragSource for the Component c |
| 105 | * @param c The Component to observe |
| 106 | */ |
| 107 | |
| 108 | protected MMouseDragGestureRecognizer(DragSource ds, Component c) { |
| 109 | this(ds, c, DnDConstants.ACTION_NONE); |
| 110 | } |
| 111 | |
| 112 | /** |
| 113 | * construct a new MMouseDragGestureRecognizer |
| 114 | * |
| 115 | * @param ds The DragSource for the Component c |
| 116 | */ |
| 117 | |
| 118 | protected MMouseDragGestureRecognizer(DragSource ds) { |
| 119 | this(ds, null); |
| 120 | } |
| 121 | |
| 122 | /** |
| 123 | * determine the drop action from the event |
| 124 | */ |
| 125 | |
| 126 | protected int mapDragOperationFromModifiers(MouseEvent e) { |
| 127 | int mods = e.getModifiersEx(); |
| 128 | int btns = mods & ButtonMask; |
| 129 | |
| 130 | // Do not allow right mouse button drag since Motif DnD does not |
| 131 | // terminate drag operation on right mouse button release. |
| 132 | if (!(btns == InputEvent.BUTTON1_DOWN_MASK || |
| 133 | btns == InputEvent.BUTTON2_DOWN_MASK)) { |
| 134 | return DnDConstants.ACTION_NONE; |
| 135 | } |
| 136 | |
| 137 | return |
| 138 | SunDragSourceContextPeer.convertModifiersToDropAction(mods, |
| 139 | getSourceActions()); |
| 140 | } |
| 141 | |
| 142 | /** |
| 143 | * Invoked when the mouse has been clicked on a component. |
| 144 | */ |
| 145 | |
| 146 | public void mouseClicked(MouseEvent e) { |
| 147 | // do nothing |
| 148 | } |
| 149 | |
| 150 | /** |
| 151 | * Invoked when a mouse button has been pressed on a component. |
| 152 | */ |
| 153 | |
| 154 | public void mousePressed(MouseEvent e) { |
| 155 | events.clear(); |
| 156 | |
| 157 | if (mapDragOperationFromModifiers(e) != DnDConstants.ACTION_NONE) { |
| 158 | try { |
| 159 | motionThreshold = DragSource.getDragThreshold(); |
| 160 | } catch (Exception exc) { |
| 161 | motionThreshold = 5; |
| 162 | } |
| 163 | appendEvent(e); |
| 164 | } |
| 165 | } |
| 166 | |
| 167 | /** |
| 168 | * Invoked when a mouse button has been released on a component. |
| 169 | */ |
| 170 | |
| 171 | public void mouseReleased(MouseEvent e) { |
| 172 | events.clear(); |
| 173 | } |
| 174 | |
| 175 | /** |
| 176 | * Invoked when the mouse enters a component. |
| 177 | */ |
| 178 | |
| 179 | public void mouseEntered(MouseEvent e) { |
| 180 | events.clear(); |
| 181 | } |
| 182 | |
| 183 | /** |
| 184 | * Invoked when the mouse exits a component. |
| 185 | */ |
| 186 | |
| 187 | public void mouseExited(MouseEvent e) { |
| 188 | if (!events.isEmpty()) { // gesture pending |
| 189 | int dragAction = mapDragOperationFromModifiers(e); |
| 190 | |
| 191 | if (dragAction == DnDConstants.ACTION_NONE) { |
| 192 | events.clear(); |
| 193 | } |
| 194 | } |
| 195 | } |
| 196 | |
| 197 | /** |
| 198 | * Invoked when a mouse button is pressed on a component. |
| 199 | */ |
| 200 | |
| 201 | public void mouseDragged(MouseEvent e) { |
| 202 | if (!events.isEmpty()) { // gesture pending |
| 203 | int dop = mapDragOperationFromModifiers(e); |
| 204 | |
| 205 | |
| 206 | if (dop == DnDConstants.ACTION_NONE) { |
| 207 | return; |
| 208 | } |
| 209 | |
| 210 | MouseEvent trigger = (MouseEvent)events.get(0); |
| 211 | |
| 212 | Point origin = trigger.getPoint(); |
| 213 | Point current = e.getPoint(); |
| 214 | |
| 215 | int dx = Math.abs(origin.x - current.x); |
| 216 | int dy = Math.abs(origin.y - current.y); |
| 217 | |
| 218 | if (dx > motionThreshold || dy > motionThreshold) { |
| 219 | fireDragGestureRecognized(dop, ((MouseEvent)getTriggerEvent()).getPoint()); |
| 220 | } else |
| 221 | appendEvent(e); |
| 222 | } |
| 223 | } |
| 224 | |
| 225 | /** |
| 226 | * Invoked when the mouse button has been moved on a component |
| 227 | * (with no buttons no down). |
| 228 | */ |
| 229 | |
| 230 | public void mouseMoved(MouseEvent e) { |
| 231 | // do nothing |
| 232 | } |
| 233 | } |