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annotate org.eclipse.draw2d/src/org/eclipse/draw2d/LayoutAnimator.d @ 12:bc29606a740c

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Added dwt-addons in original directory structure of eclipse.org
author Frank Benoit <benoit@tionex.de>
date Sat, 14 Mar 2009 18:23:29 +0100
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children dbfb303e8fb0
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1 /*******************************************************************************
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2 * Copyright (c) 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
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14 module org.eclipse.draw2d.LayoutAnimator;
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15
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16 import java.lang.all;
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17
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18 import org.eclipse.draw2d.geometry.Rectangle;
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19 import org.eclipse.draw2d.Animator;
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20 import org.eclipse.draw2d.LayoutListener;
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21 import org.eclipse.draw2d.IFigure;
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22 import org.eclipse.draw2d.Animation;
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23
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24 /**
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25 * Animates the layout of a figure's children. The animator will capture the effects of a
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26 * layout manager, and then play back the placement of children using linear interpolation
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27 * for each child's start and end locations.
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28 * <P>
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29 * To use an animator, hook it as a layout listener for the figure whose layout is to
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30 * be animated, by calling {@link IFigure#addLayoutListener(LayoutListener)}. It is not
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31 * necessary to have an animator for every figure in a composition that is undergoing
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32 * animation. For example, if a figure without an animator moves during the animation, it
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33 * will continue to move and layout its children normally during each step of the
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34 * animation.
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35 * <P>
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36 * Animator must be used in conjunction with layouts. If figures are placed manually using
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37 * <code>setBounds()</code>, the animator may not be able to track and playback the
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38 * changes that occur.
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39 *
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40 * @since 3.2
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41 */
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42 public class LayoutAnimator : Animator , LayoutListener {
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43
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44 private static LayoutAnimator INSTANCE_;
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45 static LayoutAnimator INSTANCE(){
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46 if( INSTANCE_ is null ){
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47 synchronized( LayoutAnimator.classinfo ){
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48 if( INSTANCE_ is null ){
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49 INSTANCE_ = new LayoutAnimator();
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50 }
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51 }
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52 }
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53 assert(INSTANCE_);
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54 return INSTANCE_;
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55 }
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56
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57 /**
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58 * Constructs a new Animator. The default instance ({@link #getDefault()}) can be used on
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59 * all figures being animated.
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60 *
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61 * @since 3.2
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62 */
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63 protected this() { }
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64
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65 /**
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66 * Returns an object encapsulating the placement of children in a container. This method
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67 * is called to capture both the initial and final states.
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68 * @param container the container figure
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69 * @return the current state
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70 * @since 3.2
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71 */
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72 protected Object getCurrentState(IFigure container) {
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73 Map locations = new HashMap();
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74 List children = container.getChildren();
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75 IFigure child;
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76 for (int i = 0; i < children.size(); i++) {
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77 child = cast(IFigure)children.get(i);
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78 locations.put(cast(Object)child, child.getBounds().getCopy());
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79 }
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80 return cast(Object)locations;
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81 }
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82
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83 /**
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84 * Returns the default instance.
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85 * @return the default instance
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86 * @since 3.2
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87 */
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88 public static LayoutAnimator getDefault() {
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89 return INSTANCE;
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90 }
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91
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92 /**
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93 * Hooks invalidation in case animation is in progress.
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94 * @see LayoutListener#invalidate(IFigure)
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95 */
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96 public final void invalidate(IFigure container) {
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97 if (Animation.isInitialRecording())
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98 Animation.hookAnimator(container, this);
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99 }
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100
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101 /**
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102 * Hooks layout in case animation is in progress.
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103 * @see org.eclipse.draw2d.LayoutListener#layout(org.eclipse.draw2d.IFigure)
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104 */
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105 public final bool layout(IFigure container) {
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106 if (Animation.isAnimating())
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107 return Animation.hookPlayback(container, this);
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108 return false;
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109 }
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110
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111 /**
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112 * Plays back the animated layout.
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113 * @see Animator#playback(IFigure)
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114 */
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115 protected bool playback(IFigure container) {
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116 Map initial = cast(Map) Animation.getInitialState(this, container);
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117 Map ending = cast(Map) Animation.getFinalState(this, container);
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118 if (initial is null)
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119 return false;
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120 List children = container.getChildren();
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121
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122 float progress = Animation.getProgress();
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123 float ssergorp = 1 - progress;
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124
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125 Rectangle rect1, rect2;
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126
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127 for (int i = 0; i < children.size(); i++) {
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128 IFigure child = cast(IFigure) children.get(i);
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129 rect1 = cast(Rectangle)initial.get(cast(Object)child);
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130 rect2 = cast(Rectangle)ending.get(cast(Object)child);
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131
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132 //TODO need to change this to hide the figure until the end.
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133 if (rect1 is null)
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134 continue;
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135 child.setBounds(new Rectangle(
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136 cast(int)Math.round(progress * rect2.x + ssergorp * rect1.x),
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137 cast(int)Math.round(progress * rect2.y + ssergorp * rect1.y),
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138 cast(int)Math.round(progress * rect2.width + ssergorp * rect1.width),
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139 cast(int)Math.round(progress * rect2.height + ssergorp * rect1.height)
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140 ));
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141 }
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142 return true;
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143 }
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144
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145 /**
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146 * Hooks post layout in case animation is in progress.
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147 * @see LayoutListener#postLayout(IFigure)
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148 */
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149 public final void postLayout(IFigure container) {
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150 if (Animation.isFinalRecording())
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151 Animation.hookNeedsCapture(container, this);
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152 }
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153
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154 /**
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155 * This callback is unused. Reserved for possible future use.
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156 * @see LayoutListener#remove(IFigure)
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157 */
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158 public final void remove(IFigure child) { }
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159
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160 /**
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161 * This callback is unused. Reserved for possible future use.
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162 * @see LayoutListener#setConstraint(IFigure, Object)
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163 */
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164 public final void setConstraint(IFigure child, Object constraint) { }
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165
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166 }