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annotate org.eclipse.draw2d/src/org/eclipse/draw2d/DeferredUpdateManager.d @ 16:dbfb303e8fb0

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first complete successful compile (win-only)
author Frank Benoit <benoit@tionex.de>
date Wed, 18 Mar 2009 08:56:47 +0100
parents bc29606a740c
children
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1 /*******************************************************************************
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2 * Copyright (c) 2000, 2008 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 org.eclipse.draw2d.DeferredUpdateManager;
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14
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15 import java.lang.all;
16
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16 import java.util.HashMap;
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17 import java.util.ArrayList;
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18 import java.util.Iterator;
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19 import java.util.List;
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20 import java.util.Map;
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21
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22 import org.eclipse.swt.SWT;
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23 import org.eclipse.swt.SWTException;
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24 import org.eclipse.swt.graphics.GC;
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25 import org.eclipse.swt.widgets.Display;
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26 import org.eclipse.draw2d.geometry.Rectangle;
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27 import org.eclipse.draw2d.UpdateManager;
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28 import org.eclipse.draw2d.GraphicsSource;
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29 import org.eclipse.draw2d.Graphics;
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30 import org.eclipse.draw2d.IFigure;
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31 import org.eclipse.draw2d.SWTGraphics;
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32
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33 /**
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34 * An UpdateManager that asynchronously updates the affected figures.
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35 */
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36 public class DeferredUpdateManager
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37 : UpdateManager
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38 {
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39 alias UpdateManager.addDirtyRegion addDirtyRegion;
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40
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41 /**
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42 * Calls {@link DeferredUpdateManager#performUpdate()}.
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43 */
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44 protected class UpdateRequest
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45 : Runnable
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46 {
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47 /**
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48 * Calls {@link DeferredUpdateManager#performUpdate()}.
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49 */
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50 public void run() {
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51 performUpdate();
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52 }
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53 }
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54 private Rectangle damage;
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55 private Map dirtyRegions;
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56
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57 private GraphicsSource graphicsSource;
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58 private List invalidFigures;
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59 private IFigure root;
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60 private bool updateQueued;
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61
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62 private bool updating;
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63 private bool validating;
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64 private RunnableChain afterUpdate;
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65
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66 private static class RunnableChain {
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67 RunnableChain next;
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68 Runnable run_;
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69
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70 this(Runnable run_, RunnableChain next) {
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71 this.run_ = run_;
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72 this.next = next;
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73 }
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74
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75 void run() {
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76 if (next !is null)
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77 next.run();
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78 run_.run();
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79 }
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80 }
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81
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82 /**
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83 * Empty constructor.
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84 */
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85 public this() {
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86 invalidFigures = new ArrayList();
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87 dirtyRegions = new HashMap();
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88 }
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89
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90 /**
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91 * Constructs a new DererredUpdateManager with the given GraphicsSource.
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92 * @param gs the graphics source
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93 */
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94 public this(GraphicsSource gs) {
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95 this();
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96 setGraphicsSource(gs);
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97 }
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98
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99 /**
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100 * Adds a dirty region (defined by the rectangle <i>x, y, w, h</i>) to the update queue.
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101 * If the figure isn't visible or either the width or height are 0, the method returns
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102 * without queueing the dirty region.
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103 *
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104 * @param figure the figure that contains the dirty region
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105 * @param x the x coordinate of the dirty region
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106 * @param y the y coordinate of the dirty region
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107 * @param w the width of the dirty region
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108 * @param h the height of the dirty region
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109 */
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110 public synchronized void addDirtyRegion(IFigure figure, int x, int y, int w, int h) {
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111 if (w is 0 || h is 0 || !figure.isShowing())
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112 return;
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113
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114 Rectangle rect = cast(Rectangle)dirtyRegions.get(cast(Object)figure);
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115 if (rect is null) {
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116 rect = new Rectangle(x, y, w, h);
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117 dirtyRegions.put(cast(Object)figure, rect);
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118 } else
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119 rect.union_(x, y, w, h);
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120
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121 queueWork();
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122 }
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123
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124 /**
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125 * Adds the given figure to the update queue. Invalid figures will be validated before
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126 * the damaged regions are repainted.
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127 *
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128 * @param f the invalid figure
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129 */
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130 public synchronized void addInvalidFigure(IFigure f) {
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131 if (invalidFigures.contains(cast(Object)f))
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132 return;
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133 queueWork();
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134 invalidFigures.add(cast(Object)f);
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135 }
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136
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137 /**
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138 * Returns a Graphics object for the given region.
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139 * @param region the region to be repainted
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140 * @return the Graphics object
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141 */
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142 protected Graphics getGraphics(Rectangle region) {
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143 if (graphicsSource is null)
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144 return null;
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145 return graphicsSource.getGraphics(region);
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146 }
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147
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148 void paint(GC gc) {
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149 if (!validating) {
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150 SWTGraphics graphics = new SWTGraphics(gc);
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151 if (!updating) {
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152 /**
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153 * If a paint occurs not as part of an update, we should notify that the region
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154 * is being painted. Otherwise, notification already occurs in repairDamage().
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155 */
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156 Rectangle rect = graphics.getClip(new Rectangle());
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157 HashMap map = new HashMap();
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158 map.put(cast(Object)root, rect);
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159 firePainting(rect, map);
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160 }
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161 performValidation();
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162 root.paint(graphics);
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163 graphics.dispose();
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164 } else {
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165 /*
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166 * If figures are being validated then we can simply
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167 * add a dirty region here and update will repaint this region with other
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168 * dirty regions when it gets to painting. We can't paint if we're not sure
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169 * that all figures are valid.
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170 */
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171 addDirtyRegion(root, new Rectangle(gc.getClipping()));
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172 }
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173 }
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174
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175 /**
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176 * Performs the update. Validates the invalid figures and then repaints the dirty
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177 * regions.
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178 * @see #validateFigures()
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179 * @see #repairDamage()
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180 */
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181 public synchronized void performUpdate() {
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182 if (isDisposed() || updating)
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183 return;
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184 updating = true;
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185 try {
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186 performValidation();
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187 updateQueued = false;
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188 repairDamage();
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189 if (afterUpdate !is null) {
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190 RunnableChain chain = afterUpdate;
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191 afterUpdate = null;
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192 chain.run(); //chain may queue additional Runnable.
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193 if (afterUpdate !is null)
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194 queueWork();
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195 }
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196 } finally {
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197 updating = false;
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198 }
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199 }
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200
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201 /**
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202 * @see UpdateManager#performValidation()
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203 */
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204 public void performValidation() {
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205 if (invalidFigures.isEmpty() || validating)
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206 return;
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207 try {
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208 IFigure fig;
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209 validating = true;
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210 fireValidating();
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211 for (int i = 0; i < invalidFigures.size(); i++) {
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212 fig = cast(IFigure) invalidFigures.get(i);
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213 invalidFigures.set(i, null);
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214 fig.validate();
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215 }
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216 } finally {
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217 invalidFigures.clear();
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218 validating = false;
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219 }
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220 }
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221
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222 /**
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223 * Adds the given exposed region to the update queue and then performs the update.
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224 *
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225 * @param exposed the exposed region
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226 */
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227 public synchronized void performUpdate(Rectangle exposed) {
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228 addDirtyRegion(root, exposed);
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229 performUpdate();
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230 }
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231
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232 /**
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233 * Posts an {@link UpdateRequest} using {@link Display#asyncExec(Runnable)}. If work has
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234 * already been queued, a new request is not needed.
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235 */
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236 protected void queueWork() {
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237 if (!updateQueued) {
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238 sendUpdateRequest();
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239 updateQueued = true;
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240 }
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241 }
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242
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243 /**
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244 * Fires the <code>UpdateRequest</code> to the current display asynchronously.
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245 * @since 3.2
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246 */
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247 protected void sendUpdateRequest() {
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248 Display display = Display.getCurrent();
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249 if (display is null) {
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250 throw new SWTException(SWT.ERROR_THREAD_INVALID_ACCESS);
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251 }
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252 display.asyncExec(new UpdateRequest());
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253 }
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254
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255 /**
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256 * Releases the graphics object, which causes the GraphicsSource to flush.
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257 * @param graphics the graphics object
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258 */
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259 protected void releaseGraphics(Graphics graphics) {
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260 graphics.dispose();
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261 graphicsSource.flushGraphics(damage);
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262 }
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263
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264 /**
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265 * Repaints the dirty regions on the update queue and calls
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266 * {@link UpdateManager#firePainting(Rectangle, Map)}, unless there are no dirty regions.
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267 */
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268 protected void repairDamage() {
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269 Iterator keys = dirtyRegions.keySet().iterator();
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270 Rectangle contribution;
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271 IFigure figure;
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272 IFigure walker;
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273
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274 while (keys.hasNext()) {
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275 figure = cast(IFigure)keys.next();
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276 walker = figure.getParent();
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277 contribution = cast(Rectangle)dirtyRegions.get(cast(Object)figure);
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278 //A figure can't paint beyond its own bounds
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279 contribution.intersect(figure.getBounds());
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280 while (!contribution.isEmpty() && walker !is null) {
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281 walker.translateToParent(contribution);
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282 contribution.intersect(walker.getBounds());
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283 walker = walker.getParent();
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284 }
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285 if (damage is null)
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286 damage = new Rectangle(contribution);
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287 else
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288 damage.union_(contribution);
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289 }
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290
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291 if (!dirtyRegions.isEmpty()) {
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292 Map oldRegions = dirtyRegions;
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293 dirtyRegions = new HashMap();
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294 firePainting(damage, oldRegions);
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295 }
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296
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297 if (damage !is null && !damage.isEmpty()) {
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298 //ystem.out.println(damage);
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299 Graphics graphics = getGraphics(damage);
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300 if (graphics !is null) {
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301 root.paint(graphics);
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302 releaseGraphics(graphics);
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303 }
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304 }
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305 damage = null;
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306 }
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307
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308 /**
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309 * Adds the given runnable and queues an update if an update is not under progress.
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310 * @param runnable the runnable
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311 */
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312 public synchronized void runWithUpdate(Runnable runnable) {
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313 afterUpdate = new RunnableChain(runnable, afterUpdate);
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314 if (!updating)
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315 queueWork();
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316 }
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317
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318 /**
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319 * Sets the graphics source.
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320 * @param gs the graphics source
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321 */
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322 public void setGraphicsSource(GraphicsSource gs) {
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323 graphicsSource = gs;
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324 }
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325
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326 /**
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327 * Sets the root figure.
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328 * @param figure the root figure
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329 */
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330 public void setRoot(IFigure figure) {
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331 root = figure;
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332 }
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333
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334 /**
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335 * Validates all invalid figures on the update queue and calls
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336 * {@link UpdateManager#fireValidating()} unless there are no invalid figures.
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337 */
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338 protected void validateFigures() {
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339 performValidation();
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340 }
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341
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342 }