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annotate org.eclipse.draw2d/src/org/eclipse/draw2d/parts/Thumbnail.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, 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 org.eclipse.draw2d.parts.Thumbnail;
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14
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15 import java.lang.all;
16
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16 import java.util.Iterator;
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17 import java.util.Map;
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18
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19 import org.eclipse.swt.SWT;
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20 import org.eclipse.swt.graphics.Color;
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21 import org.eclipse.swt.graphics.GC;
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22 import org.eclipse.swt.graphics.Image;
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23 static import org.eclipse.draw2d.geometry.Point;
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24 import org.eclipse.swt.widgets.Display;
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25 import org.eclipse.draw2d.Figure;
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26 import org.eclipse.draw2d.Graphics;
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27 import org.eclipse.draw2d.IFigure;
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28 import org.eclipse.draw2d.SWTGraphics;
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29 import org.eclipse.draw2d.ScaledGraphics;
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30 import org.eclipse.draw2d.UpdateListener;
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31 import org.eclipse.draw2d.geometry.Dimension;
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32 import org.eclipse.draw2d.geometry.Rectangle;
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33
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34 /**
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35 * A Thumbnail is a Figure that displays an image of its source Figure at a
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36 * smaller size. The Thumbnail will maintain the aspect ratio of the source
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37 * Figure.
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38 *
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39 * @author Eric Bordeau
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40 */
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41 public class Thumbnail
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42 : Figure
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43 , UpdateListener
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44 {
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45 alias Figure.getPreferredSize getPreferredSize;
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46
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47
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48 /**
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49 * This updates the Thumbnail by breaking the thumbnail {@link Image} into
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50 * several tiles and updating each tile individually.
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51 */
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52 class ThumbnailUpdater : Runnable {
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53 static final int MAX_BUFFER_SIZE = 256;
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54 private int currentHTile, currentVTile;
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55 private int hTiles, vTiles;
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56 private bool isActive_ = true;
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57
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58 private bool isRunning_ = false;
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59 private GC thumbnailGC;
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60 private ScaledGraphics thumbnailGraphics;
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61 private Dimension tileSize;
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62
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63 /**
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64 * Stops the updater and disposes of any resources.
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65 */
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66 public void deactivate() {
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67 setActive(false);
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68 stop();
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69 if (thumbnailImage !is null) {
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70 thumbnailImage.dispose();
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71 thumbnailImage = null;
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72 thumbnailImageSize = null;
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73 }
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74 }
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75
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76 /**
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77 * Returns the current horizontal tile index.
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78 * @return current horizontal tile index.
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79 */
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80 protected int getCurrentHTile() {
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81 return currentHTile;
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82 }
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83
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84 /**
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85 * Returns the current vertical tile index.
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86 * @return current vertical tile index.
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87 */
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88 protected int getCurrentVTile() {
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89 return currentVTile;
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90 }
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91
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92 /**
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93 * Returns <code>true</code> if this ThumbnailUpdater is active. An inactive
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94 * updater has disposed of its {@link Image}. The updater may be active and
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95 * not currently running.
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96 * @return <code>true</code> if this ThumbnailUpdater is active
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97 */
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98 public bool isActive() {
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99 return isActive_;
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100 }
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101
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102 /**
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103 * Returns <code>true</code> if this is currently running and updating at
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104 * least one tile on the thumbnail {@link Image}.
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105 * @return <code>true</code> if this is currently running
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106 */
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107 public bool isRunning() {
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108 return isRunning_;
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109 }
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110
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111 /**
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112 * Resets the number of vertical and horizontal tiles, as well as the tile
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113 * size and current tile index.
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114 */
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115 public void resetTileValues() {
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116 hTiles = cast(int)Math.ceil(cast(float)getSourceRectangle().width
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117 / cast(float)MAX_BUFFER_SIZE);
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118 vTiles = cast(int)Math.ceil(cast(float)getSourceRectangle().height
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119 / cast(float)MAX_BUFFER_SIZE);
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120
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121 tileSize = new Dimension(cast(int)Math.ceil(cast(float)getSourceRectangle().width
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122 / cast(float)hTiles),
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123 cast(int)Math.ceil(cast(float)getSourceRectangle().height
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124 / cast(float)vTiles));
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125
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126 currentHTile = 0;
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127 currentVTile = 0;
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128 }
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129
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130 /**
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131 * Restarts the updater.
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132 */
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133 public void restart() {
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134 stop();
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135 start();
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136 }
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137
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138 /**
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139 * Updates the current tile on the Thumbnail. An area of the source Figure
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140 * is painted to an {@link Image}. That Image is then drawn on the
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141 * Thumbnail. Scaling of the source Image is done inside
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142 * {@link GC#drawImage(Image, int, int, int, int, int, int, int, int)} since
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143 * the source and target sizes are different. The current tile indexes are
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144 * incremented and if more updating is necesary, this {@link Runnable} is
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145 * called again in a {@link Display#timerExec(int, Runnable)}. If no more
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146 * updating is required, {@link #stop()} is called.
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147 */
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148 public void run() {
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149 if (!isActive() || !isRunning())
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150 return;
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151 int v = getCurrentVTile();
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152 int sy1 = v * tileSize.height;
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153 int sy2 = Math.min((v + 1) * tileSize.height, getSourceRectangle().height);
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154
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155 int h = getCurrentHTile();
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156 int sx1 = h * tileSize.width;
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157 int sx2 = Math.min((h + 1) * tileSize.width, getSourceRectangle().width);
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158 org.eclipse.draw2d.geometry.Point.Point p = getSourceRectangle().getLocation();
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159
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160 Rectangle rect = new Rectangle(sx1 + p.x, sy1 + p.y, sx2 - sx1, sy2 - sy1);
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161 thumbnailGraphics.pushState();
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162 thumbnailGraphics.setClip(rect);
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163 thumbnailGraphics.fillRectangle(rect);
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164 sourceFigure.paint(thumbnailGraphics);
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165 thumbnailGraphics.popState();
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166
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167 if (getCurrentHTile() < (hTiles - 1))
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168 setCurrentHTile(getCurrentHTile() + 1);
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169 else {
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170 setCurrentHTile(0);
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171 if (getCurrentVTile() < (vTiles - 1))
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172 setCurrentVTile(getCurrentVTile() + 1);
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173 else
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174 setCurrentVTile(0);
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175 }
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176
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177 if (getCurrentHTile() !is 0 || getCurrentVTile() !is 0)
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178 Display.getCurrent().asyncExec(this);
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179 else if (isDirty()) {
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180 setDirty(false);
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181 Display.getCurrent().asyncExec(this);
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182 repaint();
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183 } else {
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184 stop();
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185 repaint();
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186 }
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187 }
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188
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189 /**
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190 * Sets the active flag.
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191 * @param value The active value
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192 */
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193 public void setActive(bool value) {
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194 isActive_ = value;
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195 }
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196
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197 /**
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198 * Sets the current horizontal tile index.
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199 * @param count current horizontal tile index
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200 */
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201 protected void setCurrentHTile(int count) {
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202 currentHTile = count;
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203 }
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204
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205 /**
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206 * Sets the current vertical tile index.
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207 * @param count current vertical tile index
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208 */
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209 protected void setCurrentVTile(int count) {
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210 currentVTile = count;
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211 }
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212
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213 /**
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214 * Starts this updater. This method initializes all the necessary resources
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215 * and puts this {@link Runnable} on the asynch queue. If this updater is
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216 * not active or is already running, this method just returns.
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217 */
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218 public void start() {
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219 if (!isActive() || isRunning())
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220 return;
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221
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222 isRunning_ = true;
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223 setDirty(false);
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224 resetTileValues();
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225
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226 if (!targetSize.opEquals(thumbnailImageSize)) {
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227 resetThumbnailImage();
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228 }
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229
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230 if (targetSize.isEmpty())
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231 return;
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232
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233 thumbnailGC = new GC(thumbnailImage,
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234 sourceFigure.isMirrored() ? SWT.RIGHT_TO_LEFT : SWT.NONE);
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235 thumbnailGraphics = new ScaledGraphics(new SWTGraphics(thumbnailGC));
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236 thumbnailGraphics.scale(getScaleX());
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237 thumbnailGraphics.translate(getSourceRectangle().getLocation().negate());
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238
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239 Color color = sourceFigure.getForegroundColor();
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240 if (color !is null)
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241 thumbnailGraphics.setForegroundColor(color);
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242 color = sourceFigure.getBackgroundColor();
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243 if (color !is null)
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244 thumbnailGraphics.setBackgroundColor(color);
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245 thumbnailGraphics.setFont(sourceFigure.getFont());
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246
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247 setScales(targetSize.width / cast(float)getSourceRectangle().width,
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248 targetSize.height / cast(float)getSourceRectangle().height);
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249
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250 Display.getCurrent().asyncExec(this);
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251 }
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252
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253 /**
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254 *
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255 * @since 3.2
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256 */
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257 private void resetThumbnailImage() {
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258 if (thumbnailImage !is null)
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259 thumbnailImage.dispose();
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260
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261 if (!targetSize.isEmpty()) {
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262 thumbnailImage = new Image(Display.getDefault(),
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263 targetSize.width,
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264 targetSize.height);
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265 thumbnailImageSize = new Dimension(targetSize);
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266 }
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267 else {
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268 thumbnailImage = null;
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269 thumbnailImageSize = new Dimension(0, 0);
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270 }
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271 }
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272
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273 /**
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274 * Stops this updater. Also disposes of resources (except the thumbnail
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275 * image which is still needed for painting).
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276 */
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277 public void stop() {
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278 isRunning_ = false;
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279 if (thumbnailGC !is null) {
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280 thumbnailGC.dispose();
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281 thumbnailGC = null;
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282 }
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283 if (thumbnailGraphics !is null) {
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284 thumbnailGraphics.dispose();
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285 thumbnailGraphics = null;
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286 }
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287 // Don't dispose of the thumbnail image since it is needed to paint the
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288 // figure when the source is not dirty (i.e. showing/hiding the dock).
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289 }
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290 }
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291 private bool isDirty_;
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292 private float scaleX;
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293 private float scaleY;
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294
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295 private IFigure sourceFigure;
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296 Dimension targetSize;
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297 private Image thumbnailImage;
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298 private Dimension thumbnailImageSize;
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299 private ThumbnailUpdater updater;
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300
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301 /**
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302 * Creates a new Thumbnail. The source Figure must be set separately if you
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303 * use this constructor.
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304 */
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305 public this() {
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306 super();
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307 targetSize = new Dimension(0, 0);
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308 updater = new ThumbnailUpdater();
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309 }
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310
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311 /**
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312 * Creates a new Thumbnail with the given IFigure as its source figure.
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313 * @param fig The source figure
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314 */
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315 public this(IFigure fig) {
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316 this();
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317 setSource(fig);
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318 }
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319
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320 private Dimension adjustToAspectRatio(Dimension size, bool adjustToMaxDimension) {
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321 Dimension sourceSize = getSourceRectangle().getSize();
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322 Dimension borderSize = new Dimension(getInsets().getWidth(), getInsets().getHeight());
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323 size.expand(borderSize.getNegated());
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324 int width, height;
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325 if (adjustToMaxDimension) {
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326 width = Math.max(size.width, cast(int)(size.height * sourceSize.width
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327 / cast(float)sourceSize.height + 0.5));
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328 height = Math.max(size.height, cast(int)(size.width * sourceSize.height
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329 / cast(float)sourceSize.width + 0.5));
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330 } else {
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331 width = Math.min(size.width, cast(int)(size.height * sourceSize.width
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332 / cast(float)sourceSize.height + 0.5));
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333 height = Math.min(size.height, cast(int)(size.width * sourceSize.height
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334 / cast(float)sourceSize.width + 0.5));
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335 }
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336 size.width = width;
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337 size.height = height;
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338 return size.expand(borderSize);
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339 }
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340
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341 /**
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342 * Deactivates this Thumbnail.
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343 */
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344 public void deactivate() {
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345 sourceFigure.getUpdateManager().removeUpdateListener(this);
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346 updater.deactivate();
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347 }
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348
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349 /**
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350 * Returns the preferred size of this Thumbnail. The preferred size will be
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351 * calculated in a way that maintains the source Figure's aspect ratio.
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352 *
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353 * @param wHint The width hint
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354 * @param hHint The height hint
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355 * @return The preferred size
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356 */
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357 public Dimension getPreferredSize(int wHint, int hHint) {
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358 if (prefSize is null)
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359 return adjustToAspectRatio(getBounds().getSize(), false);
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360
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361 Dimension preferredSize = adjustToAspectRatio(prefSize.getCopy(), true);
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362
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363 if (maxSize is null)
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364 return preferredSize;
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365
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366 Dimension maximumSize = adjustToAspectRatio(maxSize.getCopy(), true);
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367 if (preferredSize.contains(maximumSize))
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368 return maximumSize;
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369 else
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370 return preferredSize;
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371 }
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372
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373 /**
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374 * Returns the scale factor on the X-axis.
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375 * @return X scale
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376 */
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377 protected float getScaleX() {
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378 return scaleX;
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379 }
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380
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381 /**
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382 * Returns the scale factor on the Y-axis.
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383 * @return Y scale
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384 */
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385 protected float getScaleY() {
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386 return scaleY;
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387 }
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388
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389 /**
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390 * Returns the source figure being used to generate a thumbnail.
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391 * @return the source figure
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392 */
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393 protected IFigure getSource() {
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394 return sourceFigure;
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395 }
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396
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Frank Benoit <benoit@tionex.de>
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397 /**
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Frank Benoit <benoit@tionex.de>
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diff changeset
398 * Returns the rectangular region relative to the source figure which will be the basis of
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399 * the thumbnail. The value may be returned by reference and should not be modified by
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diff changeset
400 * the caller.
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parents:
diff changeset
401 * @since 3.1
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
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402 * @return the region of the source figure being used for the thumbnail
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Frank Benoit <benoit@tionex.de>
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403 */
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parents:
diff changeset
404 protected Rectangle getSourceRectangle() {
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405 return sourceFigure.getBounds();
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406 }
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Frank Benoit <benoit@tionex.de>
parents:
diff changeset
407
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
408 /**
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Frank Benoit <benoit@tionex.de>
parents:
diff changeset
409 * Returns the scaled Image of the source Figure. If the Image needs to be
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
410 * updated, the ThumbnailUpdater will notified.
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Frank Benoit <benoit@tionex.de>
parents:
diff changeset
411 *
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
412 * @return The thumbnail image
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Frank Benoit <benoit@tionex.de>
parents:
diff changeset
413 */
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parents:
diff changeset
414 protected Image getThumbnailImage() {
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diff changeset
415 Dimension oldSize = targetSize;
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diff changeset
416 targetSize = getPreferredSize();
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diff changeset
417 targetSize.expand((new Dimension(getInsets().getWidth(),
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diff changeset
418 getInsets().getHeight())).negate());
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parents:
diff changeset
419 setScales(targetSize.width / cast(float)getSourceRectangle().width,
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diff changeset
420 targetSize.height / cast(float)getSourceRectangle().height);
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diff changeset
421 if ((isDirty()) && !updater.isRunning())
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diff changeset
422 updater.start();
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423 else if (oldSize !is null && !targetSize.opEquals(oldSize)) {
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parents:
diff changeset
424 revalidate();
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Frank Benoit <benoit@tionex.de>
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diff changeset
425 updater.restart();
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Frank Benoit <benoit@tionex.de>
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diff changeset
426 }
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Frank Benoit <benoit@tionex.de>
parents:
diff changeset
427
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Frank Benoit <benoit@tionex.de>
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diff changeset
428 return thumbnailImage;
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parents:
diff changeset
429 }
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Frank Benoit <benoit@tionex.de>
parents:
diff changeset
430
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
431 /**
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
432 * Returns <code>true</code> if the source figure has changed.
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
433 * @return <code>true</code> if the source figure has changed
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Frank Benoit <benoit@tionex.de>
parents:
diff changeset
434 */
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
435 protected bool isDirty() {
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Frank Benoit <benoit@tionex.de>
parents:
diff changeset
436 return isDirty_;
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
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437 }
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
438
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
439 /**
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
440 * @see org.eclipse.draw2d.UpdateListener#notifyPainting(Rectangle, Map)
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
441 */
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Frank Benoit <benoit@tionex.de>
parents:
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442 public void notifyPainting(Rectangle damage, Map dirtyRegions) {
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443 Iterator dirtyFigures = dirtyRegions.keySet().iterator();
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444 while (dirtyFigures.hasNext()) {
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445 IFigure current = cast(IFigure)dirtyFigures.next();
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446 while (current !is null) {
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447 if (current is getSource()) {
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448 setDirty(true);
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449 repaint();
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450 return;
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451 }
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452 current = current.getParent();
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453 }
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454 }
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455 }
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456
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457 /**
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458 * @see org.eclipse.draw2d.UpdateListener#notifyValidating()
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
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459 */
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460 public void notifyValidating() {
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461 // setDirty(true);
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462 // revalidate();
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463 }
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464
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465 /**
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466 * @see org.eclipse.draw2d.Figure#paintFigure(Graphics)
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467 */
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468 protected void paintFigure(Graphics graphics) {
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469 Image thumbnail = getThumbnailImage();
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470 if (thumbnail is null)
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471 return;
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472 graphics.drawImage(thumbnail, getClientArea().getLocation());
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473 }
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474
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475 /**
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476 * Sets the dirty flag.
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477 * @param value The dirty value
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478 */
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479 public void setDirty(bool value) {
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480 isDirty_ = value;
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481 }
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482
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483 /**
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484 * Sets the X and Y scales for the Thumbnail. These scales represent the ratio
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485 * between the source figure and the Thumbnail.
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486 * @param x The X scale
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487 * @param y The Y scale
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488 */
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489 protected void setScales(float x, float y) {
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490 scaleX = x;
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491 scaleY = y;
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492 }
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493
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494 /**
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495 * Sets the source Figure. Also sets the scales and creates the necessary
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496 * update manager.
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497 * @param fig The source figure
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498 */
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499 public void setSource(IFigure fig) {
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500 if (sourceFigure is fig)
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501 return;
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502 if (sourceFigure !is null)
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503 sourceFigure.getUpdateManager().removeUpdateListener(this);
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504 sourceFigure = fig;
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505 if (sourceFigure !is null) {
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506 setScales(cast(float)getSize().width / cast(float)getSourceRectangle().width,
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507 cast(float)getSize().height / cast(float)getSourceRectangle().height);
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508 sourceFigure.getUpdateManager().addUpdateListener(this);
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509 repaint();
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510 }
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511 }
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512
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513 }