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| 1 | /* | ||
| 2 | * Copyright (c) 1998, 2003, Oracle and/or its affiliates. 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. Oracle designates this | ||
| 8 | * particular file as subject to the "Classpath" exception as provided | ||
| 9 | * by Oracle 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | ||
| 22 | * or visit www.oracle.com if you need additional information or have any | ||
| 23 | * questions. | ||
| 24 | */ | ||
| 25 | |||
| 26 | package java.awt.dnd; | ||
| 27 | |||
| 28 | import java.awt.Component; | ||
| 29 | |||
| 30 | import java.awt.event.MouseEvent; | ||
| 31 | import java.awt.event.MouseListener; | ||
| 32 | import java.awt.event.MouseMotionListener; | ||
| 33 | |||
| 34 | /** | ||
| 35 | * This abstract subclass of <code>DragGestureRecognizer</code> | ||
| 36 | * defines a <code>DragGestureRecognizer</code> | ||
| 37 | * for mouse-based gestures. | ||
| 38 | * | ||
| 39 | * Each platform implements its own concrete subclass of this class, | ||
| 40 | * available via the Toolkit.createDragGestureRecognizer() method, | ||
| 41 | * to encapsulate | ||
| 42 | * the recognition of the platform dependent mouse gesture(s) that initiate | ||
| 43 | * a Drag and Drop operation. | ||
| 44 | * <p> | ||
| 45 | * Mouse drag gesture recognizers should honor the | ||
| 46 | * drag gesture motion threshold, available through | ||
| 47 | * {@link DragSource#getDragThreshold}. | ||
| 48 | * A drag gesture should be recognized only when the distance | ||
| 49 | * in either the horizontal or vertical direction between | ||
| 50 | * the location of the latest mouse dragged event and the | ||
| 51 | * location of the corresponding mouse button pressed event | ||
| 52 | * is greater than the drag gesture motion threshold. | ||
| 53 | * <p> | ||
| 54 | * Drag gesture recognizers created with | ||
| 55 | * {@link DragSource#createDefaultDragGestureRecognizer} | ||
| 56 | * follow this convention. | ||
| 57 | * | ||
| 58 | * @author Laurence P. G. Cable | ||
| 59 | * | ||
| 60 | * @see java.awt.dnd.DragGestureListener | ||
| 61 | * @see java.awt.dnd.DragGestureEvent | ||
| 62 | * @see java.awt.dnd.DragSource | ||
| 63 | */ | ||
| 64 | |||
| 65 | public abstract class MouseDragGestureRecognizer extends DragGestureRecognizer implements MouseListener, MouseMotionListener { | ||
| 66 | |||
| 67 | private static final long serialVersionUID = 6220099344182281120L; | ||
| 68 | |||
| 69 | /** | ||
| 70 | * Construct a new <code>MouseDragGestureRecognizer</code> | ||
| 71 | * given the <code>DragSource</code> for the | ||
| 72 | * <code>Component</code> c, the <code>Component</code> | ||
| 73 | * to observe, the action(s) | ||
| 74 | * permitted for this drag operation, and | ||
| 75 | * the <code>DragGestureListener</code> to | ||
| 76 | * notify when a drag gesture is detected. | ||
| 77 | * <P> | ||
| 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 DragGestureListener to notify when a gesture is detected | ||
| 82 | * | ||
| 83 | */ | ||
| 84 | |||
| 85 | protected MouseDragGestureRecognizer(DragSource ds, Component c, int act, DragGestureListener dgl) { | ||
| 86 | super(ds, c, act, dgl); | ||
| 87 | } | ||
| 88 | |||
| 89 | /** | ||
| 90 | * Construct a new <code>MouseDragGestureRecognizer</code> | ||
| 91 | * given the <code>DragSource</code> for | ||
| 92 | * the <code>Component</code> c, | ||
| 93 | * the <code>Component</code> to observe, and the action(s) | ||
| 94 | * permitted for this drag operation. | ||
| 95 | * <P> | ||
| 96 | * @param ds The DragSource for the Component c | ||
| 97 | * @param c The Component to observe | ||
| 98 | * @param act The actions permitted for this drag | ||
| 99 | */ | ||
| 100 | |||
| 101 | protected MouseDragGestureRecognizer(DragSource ds, Component c, int act) { | ||
| 102 | this(ds, c, act, null); | ||
| 103 | } | ||
| 104 | |||
| 105 | /** | ||
| 106 | * Construct a new <code>MouseDragGestureRecognizer</code> | ||
| 107 | * given the <code>DragSource</code> for the | ||
| 108 | * <code>Component</code> c, and the | ||
| 109 | * <code>Component</code> to observe. | ||
| 110 | * <P> | ||
| 111 | * @param ds The DragSource for the Component c | ||
| 112 | * @param c The Component to observe | ||
| 113 | */ | ||
| 114 | |||
| 115 | protected MouseDragGestureRecognizer(DragSource ds, Component c) { | ||
| 116 | this(ds, c, DnDConstants.ACTION_NONE); | ||
| 117 | } | ||
| 118 | |||
| 119 | /** | ||
| 120 | * Construct a new <code>MouseDragGestureRecognizer</code> | ||
| 121 | * given the <code>DragSource</code> for the <code>Component</code>. | ||
| 122 | * <P> | ||
| 123 | * @param ds The DragSource for the Component | ||
| 124 | */ | ||
| 125 | |||
| 126 | protected MouseDragGestureRecognizer(DragSource ds) { | ||
| 127 | this(ds, null); | ||
| 128 | } | ||
| 129 | |||
| 130 | /** | ||
| 131 | * register this DragGestureRecognizer's Listeners with the Component | ||
| 132 | */ | ||
| 133 | |||
| 134 | protected void registerListeners() { | ||
| 135 | component.addMouseListener(this); | ||
| 136 | component.addMouseMotionListener(this); | ||
| 137 | } | ||
| 138 | |||
| 139 | /** | ||
| 140 | * unregister this DragGestureRecognizer's Listeners with the Component | ||
| 141 | * | ||
| 142 | * subclasses must override this method | ||
| 143 | */ | ||
| 144 | |||
| 145 | |||
| 146 | protected void unregisterListeners() { | ||
| 147 | component.removeMouseListener(this); | ||
| 148 | component.removeMouseMotionListener(this); | ||
| 149 | } | ||
| 150 | |||
| 151 | /** | ||
| 152 | * Invoked when the mouse has been clicked on a component. | ||
| 153 | * <P> | ||
| 154 | * @param e the <code>MouseEvent</code> | ||
| 155 | */ | ||
| 156 | |||
| 157 | public void mouseClicked(MouseEvent e) { } | ||
| 158 | |||
| 159 | /** | ||
| 160 | * Invoked when a mouse button has been | ||
| 161 | * pressed on a <code>Component</code>. | ||
| 162 | * <P> | ||
| 163 | * @param e the <code>MouseEvent</code> | ||
| 164 | */ | ||
| 165 | |||
| 166 | public void mousePressed(MouseEvent e) { } | ||
| 167 | |||
| 168 | /** | ||
| 169 | * Invoked when a mouse button has been released on a component. | ||
| 170 | * <P> | ||
| 171 | * @param e the <code>MouseEvent</code> | ||
| 172 | */ | ||
| 173 | |||
| 174 | public void mouseReleased(MouseEvent e) { } | ||
| 175 | |||
| 176 | /** | ||
| 177 | * Invoked when the mouse enters a component. | ||
| 178 | * <P> | ||
| 179 | * @param e the <code>MouseEvent</code> | ||
| 180 | */ | ||
| 181 | |||
| 182 | public void mouseEntered(MouseEvent e) { } | ||
| 183 | |||
| 184 | /** | ||
| 185 | * Invoked when the mouse exits a component. | ||
| 186 | * <P> | ||
| 187 | * @param e the <code>MouseEvent</code> | ||
| 188 | */ | ||
| 189 | |||
| 190 | public void mouseExited(MouseEvent e) { } | ||
| 191 | |||
| 192 | /** | ||
| 193 | * Invoked when a mouse button is pressed on a component. | ||
| 194 | * <P> | ||
| 195 | * @param e the <code>MouseEvent</code> | ||
| 196 | */ | ||
| 197 | |||
| 198 | public void mouseDragged(MouseEvent e) { } | ||
| 199 | |||
| 200 | /** | ||
| 201 | * Invoked when the mouse button has been moved on a component | ||
| 202 | * (with no buttons no down). | ||
| 203 | * <P> | ||
| 204 | * @param e the <code>MouseEvent</code> | ||
| 205 | */ | ||
| 206 | |||
| 207 | public void mouseMoved(MouseEvent e) { } | ||
| 208 | } | ||