1 /* |
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2 * Copyright 1997-2008 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 javax.swing.plaf.basic; |
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27 |
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28 import javax.swing.*; |
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29 import java.awt.*; |
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30 import java.awt.event.*; |
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31 import java.beans.*; |
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32 |
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33 /** |
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34 * DesktopIconMover is intended to move desktop icon |
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35 * when parent window is resized. |
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36 */ |
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37 class DesktopIconMover implements ComponentListener, PropertyChangeListener { |
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38 private Component parent; |
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39 private JInternalFrame frame; // if not null, DesktopIconMover(frame) |
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40 // constructor was used |
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41 private JInternalFrame.JDesktopIcon icon; |
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42 private Rectangle parentBounds; |
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43 private boolean componentListenerAdded = false; |
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44 |
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45 public DesktopIconMover(JInternalFrame frame) { |
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46 if (frame == null) { |
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47 throw new NullPointerException("Frame cannot be null"); |
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48 } |
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49 this.frame = frame; |
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50 this.icon = frame.getDesktopIcon(); |
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51 if (icon == null) { |
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52 throw new NullPointerException( |
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53 "frame.getDesktopIcon() cannot be null"); |
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54 } |
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55 this.parent = frame.getParent(); |
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56 if (this.parent != null) { |
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57 parentBounds = this.parent.getBounds(); |
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58 } |
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59 } |
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60 |
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61 public DesktopIconMover(JInternalFrame.JDesktopIcon icon) { |
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62 if (icon == null) { |
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63 throw new NullPointerException("Icon cannot be null"); |
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64 } |
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65 this.icon = icon; |
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66 this.parent = icon.getParent(); |
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67 if (this.parent != null) { |
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68 parentBounds = this.parent.getBounds(); |
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69 } |
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70 } |
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71 |
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72 public void installListeners() { |
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73 if (frame != null) { |
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74 frame.addPropertyChangeListener(this); |
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75 } else { |
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76 icon.addPropertyChangeListener(this); |
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77 } |
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78 addComponentListener(); |
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79 } |
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80 |
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81 public void uninstallListeners() { |
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82 if (frame != null) { |
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83 frame.removePropertyChangeListener(this); |
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84 } else { |
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85 icon.removePropertyChangeListener(this); |
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86 } |
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87 removeComponentListener(); |
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88 } |
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89 |
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90 public void propertyChange(PropertyChangeEvent evt) { |
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91 String propName = evt.getPropertyName(); |
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92 if ("ancestor".equals(propName)) { |
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93 Component newAncestor = (Component) evt.getNewValue(); |
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94 |
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95 // Remove component listener if parent is changing |
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96 Component probablyNewParent = getCurrentParent(); |
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97 if ((probablyNewParent != null) && |
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98 (!probablyNewParent.equals(parent))) { |
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99 removeComponentListener(); |
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100 parent = probablyNewParent; |
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101 } |
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102 |
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103 if (newAncestor == null) { |
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104 removeComponentListener(); |
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105 } else { |
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106 addComponentListener(); |
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107 } |
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108 |
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109 // Update parentBounds |
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110 if (parent != null) { |
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111 parentBounds = parent.getBounds(); |
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112 } else { |
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113 parentBounds = null; |
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114 } |
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115 } else if (JInternalFrame.IS_CLOSED_PROPERTY.equals(propName)) { |
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116 removeComponentListener(); |
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117 } |
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118 } |
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119 |
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120 private void addComponentListener() { |
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121 if (!componentListenerAdded && (parent != null)) { |
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122 parent.addComponentListener(this); |
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123 componentListenerAdded = true; |
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124 } |
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125 } |
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126 |
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127 private void removeComponentListener() { |
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128 if ((parent != null) && componentListenerAdded) { |
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129 parent.removeComponentListener(this); |
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130 componentListenerAdded = false; |
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131 } |
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132 } |
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133 |
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134 private Component getCurrentParent() { |
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135 if (frame != null) { |
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136 return frame.getParent(); |
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137 } else { |
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138 return icon.getParent(); |
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139 } |
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140 } |
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141 |
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142 public void componentResized(ComponentEvent e) { |
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143 if ((parent == null) || (parentBounds == null)) { |
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144 return; |
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145 } |
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146 |
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147 Rectangle parentNewBounds = parent.getBounds(); |
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148 if ((parentNewBounds == null) || parentNewBounds.equals(parentBounds)) { |
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149 return; |
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150 } |
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151 |
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152 // Move desktop icon only in up-down direction |
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153 int newIconY = icon.getLocation().y + |
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154 (parentNewBounds.height - parentBounds.height); |
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155 icon.setLocation(icon.getLocation().x, newIconY); |
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156 |
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157 parentBounds = parentNewBounds; |
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158 } |
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159 |
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160 public void componentMoved(ComponentEvent e) { |
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161 } |
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162 |
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163 public void componentShown(ComponentEvent e) { |
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164 } |
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165 |
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166 public void componentHidden(ComponentEvent e) { |
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167 } |
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168 } |
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