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annotate dwtx/draw2d/AbstractLayout.d @ 98:95307ad235d9

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Added Draw2d code, still work in progress
author Frank Benoit <benoit@tionex.de>
date Sun, 03 Aug 2008 00:52:14 +0200
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1 /*******************************************************************************
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2 * Copyright (c) 2000, 2005 IBM Corporation and others.
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3 * All rights reserved. This program and the accompanying materials
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4 * are made available under the terms of the Eclipse Public License v1.0
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5 * which accompanies this distribution, and is available at
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6 * http://www.eclipse.org/legal/epl-v10.html
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7 *
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8 * Contributors:
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9 * IBM Corporation - initial API and implementation
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10 * Port to the D programming language:
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11 * Frank Benoit <benoit@tionex.de>
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12 *******************************************************************************/
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13 module dwtx.draw2d.AbstractLayout;
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14
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15 import dwt.dwthelper.utils;
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16
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17 import dwtx.draw2d.geometry.Dimension;
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18 import dwtx.draw2d.IFigure;
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19 import dwtx.draw2d.LayoutManager;
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20
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21 /**
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22 * Provides generic support for LayoutManagers.
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23 */
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24 public abstract class AbstractLayout
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25 : LayoutManager
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26 {
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27
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28 /**
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29 * The cached preferred size.
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30 */
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31 protected Dimension preferredSize;
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32
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33 /**
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34 * Whether or not this layout pays attention to visiblity of figures when
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35 * calculating its bounds. By default, false.
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36 */
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37 protected bool isObservingVisibility_ = false;
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38
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39 /**
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40 * This method is now {@link #calculatePreferredSize(IFigure, int, int)}.
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41 * @param container the figure
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42 */
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43 protected final void calculatePreferredSize(IFigure container) { }
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44
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45 /**
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46 * Calculates the preferred size of the given figure, using width and height hints.
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47 * @param container The figure
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48 * @param wHint The width hint
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49 * @param hHint The height hint
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50 * @return The preferred size
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51 */
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52 protected abstract Dimension calculatePreferredSize(IFigure container,
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53 int wHint, int hHint);
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54
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55 /**
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56 * Returns the preferred size of the figure's border.
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57 * @param container The figure that the border is on
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58 * @return The border's preferred size
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59 */
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60 protected Dimension getBorderPreferredSize(IFigure container) {
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61 if (container.getBorder() is null)
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62 return new Dimension();
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63 return container.getBorder().getPreferredSize(container);
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64 }
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65
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66 /**
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67 * Returns the constraint for the given figure.
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68 * @param child The figure
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69 * @return The constraint
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70 */
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71 public Object getConstraint(IFigure child) {
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72 return null;
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73 }
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74
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75 /**
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76 * This method is now {@link #getMinimumSize(IFigure, int, int)}.
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77 * @param container the figure
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78 */
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79 public final void getMinimumSize(IFigure container) { }
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80
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81 /**
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82 * @see dwtx.draw2d.LayoutManager#getMinimumSize(IFigure, int, int)
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83 */
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84 public Dimension getMinimumSize(IFigure container, int wHint, int hHint) {
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85 return getPreferredSize(container, wHint, hHint);
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86 }
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87
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88 /**
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89 * Returns the preferred size of the given figure, using width and height hints. If the
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90 * preferred size is cached, that size is returned. Otherwise, {@link
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91 * #calculatePreferredSize(IFigure, int, int)} is called.
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92 * @param container The figure
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93 * @param wHint The width hint
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94 * @param hHint The height hint
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95 * @return The preferred size
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96 */
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97 public Dimension getPreferredSize(IFigure container, int wHint, int hHint) {
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98 if (preferredSize is null)
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99 preferredSize = calculatePreferredSize(container, wHint, hHint);
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100 return preferredSize;
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101 }
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102
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103 /**
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104 * This method is now {@link #getPreferredSize(IFigure, int, int)}.
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105 * @param container the figure
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106 */
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107 public final void getPreferredSize(IFigure container) { }
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108
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109
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110 /**
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111 * @see dwtx.draw2d.LayoutManager#invalidate()
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112 */
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113 public void invalidate() {
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114 preferredSize = null;
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115 }
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116
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117 /**
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118 * Removes any cached information about the given figure.
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119 * @param child the child that is invalidated
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120 */
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121 protected void invalidate(IFigure child) {
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122 invalidate();
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123 }
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124
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125 /**
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126 * Returns whether or not this layout pays attention to visiblity when calculating its
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127 * bounds.
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128 * @return true if invisible figures should not contribute to this layout's bounds.
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129 */
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130 public bool isObservingVisibility() {
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131 return isObservingVisibility_;
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132 }
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133
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134 /**
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135 * Removes the given figure from this LayoutManager's list of figures.
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136 * @param child The figure to remove
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137 */
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138 public void remove(IFigure child) {
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139 invalidate();
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140 }
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141
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142 /**
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143 * Sets the constraint for the given figure.
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144 * @param child the child
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145 * @param constraint the child's new constraint
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146 */
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147 public void setConstraint(IFigure child, Object constraint) {
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148 invalidate(child);
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149 }
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150
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151 /**
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152 * Sets isObservingVisibility to the given value.
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153 * @param newValue <code>true</code> if visibility should be observed
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154 */
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155 public void setObserveVisibility(bool newValue) {
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156 if (isObservingVisibility_ is newValue)
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157 return;
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158 isObservingVisibility_ = newValue;
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159 }
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160
95307ad235d9 Added Draw2d code, still work in progress
Frank Benoit <benoit@tionex.de>
parents:
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