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