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annotate org.eclipse.draw2d/src/org/eclipse/draw2d/Viewport.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
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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.Viewport;
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14
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15 import java.lang.all;
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16 import java.beans.PropertyChangeListener;
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17 import java.beans.PropertyChangeEvent;
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18
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19 import org.eclipse.draw2d.geometry.Point;
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20 import org.eclipse.draw2d.geometry.Rectangle;
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21 import org.eclipse.draw2d.geometry.Translatable;
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22 import org.eclipse.draw2d.Figure;
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23 import org.eclipse.draw2d.IFigure;
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24 import org.eclipse.draw2d.Graphics;
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25 import org.eclipse.draw2d.RangeModel;
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26 import org.eclipse.draw2d.ViewportLayout;
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27 import org.eclipse.draw2d.DefaultRangeModel;
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28
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29 /**
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30 * A Viewport is a flexible window onto a {@link ScrollPane} and represents the visible
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31 * portion of the ScrollPane.
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32 */
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33 public class Viewport
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34 : Figure
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35 , PropertyChangeListener
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36 {
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37
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38 public alias Figure.getClientArea getClientArea;
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39
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40 /** ID for the view location property */
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41 public static final String PROPERTY_VIEW_LOCATION = "viewLocation"; //$NON-NLS-1$
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42 private IFigure view;
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43
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44 private bool useTranslate = false;
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45 private bool trackWidth = false;
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46 private bool trackHeight = false;
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47 private bool ignoreScroll = false;
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48 private RangeModel
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49 horiztonalRangeModel = null,
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50 verticalRangeModel = null;
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51
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52 private void instanceInit(){
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53 setLayoutManager(new ViewportLayout());
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54 setHorizontalRangeModel(new DefaultRangeModel());
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55 setVerticalRangeModel(new DefaultRangeModel());
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56 }
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57
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58 /**
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59 * Constructs a new Viewport with the default values.
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60 */
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61 public this() {
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62 instanceInit();
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63 }
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64
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65 /**
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66 * Constructs a new Viewport. If <i>setting</i> is <code>true</code>, the viewport will
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67 * use graphics translation to paint.
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68 * @param setting whether to use graphics translation
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69 */
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70 public this(bool setting) {
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71 instanceInit();
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72 useTranslate = setting;
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73 }
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74
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75 /**
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76 * @see IFigure#getClientArea(Rectangle)
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77 */
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78 public Rectangle getClientArea(Rectangle rect) {
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79 super.getClientArea(rect);
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80 if (useGraphicsTranslate())
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81 rect.translate(getViewLocation());
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82 return rect;
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83 }
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84
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85 /**
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86 * Returns the view, which is the contents of the {@link ScrollPane} associated with this
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87 * Viewport.
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88 *
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89 * @return the contents
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90 * @since 2.0
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91 */
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92 public IFigure getContents() {
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93 return view;
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94 }
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95
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96 /**
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97 * Returns the RangeModel associated with the horizontal motion of this Viewport
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98 * @return the RangeModel
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99 *
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100 * @since 2.0
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101 */
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102 public RangeModel getHorizontalRangeModel() {
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103 return horiztonalRangeModel;
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104 }
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105
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106 /**
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107 * Returns <code>true</code> if the Viewport resizes itself in the vertical direction when
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108 * the available height of its view is decreased, false otherwise. This option is turned
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109 * off by default, and can be activated by calling
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110 * {@link #setContentsTracksHeight(bool)} and passing in <code>true</code>.
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111 *
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112 * @return whether the contents tracks height
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113 * @since 2.0
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114 */
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115 public bool getContentsTracksHeight() {
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116 return trackHeight;
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117 }
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118
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119 /**
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120 * Returns <code>true</code> if the Viewport resizes itself in the horizontal direction
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121 * when the available width of its view is decreased, false otherwise. This option is
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122 * turned off by default, and can be activated by calling
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123 * {@link #setContentsTracksWidth(bool)} and passing in <code>true</code>.
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124 *
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125 * @return whether the contents tracks width
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126 * @since 2.0
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127 */
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128 public bool getContentsTracksWidth() {
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129 return trackWidth;
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130 }
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131
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132 /**
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133 * Returns the range model associated with the vertical motion of the Viewport.
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134 * @return the RangeModel
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135 *
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136 * @since 2.0
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137 */
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138 public RangeModel getVerticalRangeModel() {
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139 return verticalRangeModel;
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140 }
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141
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142 /**
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143 * Returns the current location of this Viewport.
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144 * @return the current location of this Viewport
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145 *
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146 * @since 2.0
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147 */
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148 public Point getViewLocation() {
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149 return new Point(
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150 getHorizontalRangeModel().getValue(),
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151 getVerticalRangeModel().getValue());
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152 }
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153
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154 private void localRevalidate() {
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155 invalidate();
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156 if (getLayoutManager() !is null)
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157 getLayoutManager().invalidate();
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158 getUpdateManager().addInvalidFigure(this);
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159 }
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160
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161 /**
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162 * @see Figure#paintClientArea(Graphics)
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163 */
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164 protected void paintClientArea(Graphics g) {
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165 if (useGraphicsTranslate()) {
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166 Point p = getViewLocation();
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167 try {
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168 g.translate(-p.x, -p.y);
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169 g.pushState();
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170 super.paintClientArea(g);
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171 g.popState();
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172 } finally {
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173 g.translate(p.x, p.y);
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174 }
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175 } else
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176 super.paintClientArea(g);
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177 }
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178
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179 /**
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180 * @see org.eclipse.draw2d.Figure#isCoordinateSystem()
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181 */
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182 public bool isCoordinateSystem() {
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183 return useGraphicsTranslate() || super.isCoordinateSystem();
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184 }
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185
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186 /**
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187 * Listens for either of the {@link RangeModel RangeModels} to fire a property change
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188 * event and updates the view accordingly.
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189 * @param event the event
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190 */
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191 public void propertyChange(PropertyChangeEvent event) {
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192 if (null !is cast(RangeModel)(event.getSource()) ) {
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193 if (RangeModel.PROPERTY_VALUE.equals(event.getPropertyName())) {
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194 if (!ignoreScroll) {
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195 localRevalidate();
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196 if (useGraphicsTranslate()) {
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197 repaint();
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198 fireMoved();
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199 }
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200 }
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201 firePropertyChange(PROPERTY_VIEW_LOCATION, event.getOldValue(),
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202 event.getNewValue());
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203 }
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204 }
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205 }
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206
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207 /**
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208 * Sets extents of {@link RangeModel RangeModels} to the client area of this Viewport.
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209 * Sets RangeModel minimums to zero. Sets RangeModel maximums to this Viewport's
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210 * height/width.
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211 *
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212 * @since 2.0
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213 */
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214 protected void readjustScrollBars() {
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215 if (getContents() is null)
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216 return;
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217 getVerticalRangeModel().setAll(0, getClientArea().height,
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218 getContents().getBounds().height);
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219 getHorizontalRangeModel().setAll(0, getClientArea().width,
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220 getContents().getBounds().width);
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221 }
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222
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223 /**
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224 * Sets this Viewport to be associated with the passed Figure.
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225 *
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226 * @param figure the new contents
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227 * @since 2.0
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228 */
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229 public void setContents(IFigure figure) {
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230 if (view is figure)
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231 return;
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232 if (view !is null)
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233 remove(view);
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234 view = figure;
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235 if (view !is null)
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236 add(figure);
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237 }
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238
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239 /**
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240 * Toggles the Viewport's ability to resize itself automatically when its view is
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241 * decreased in size in the vertical direction. This is disabled by default.
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242 *
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243 * @param track whether this viewport should track its height
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244 * @since 2.0
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245 */
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246 public void setContentsTracksHeight(bool track) {
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247 trackHeight = track;
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248 }
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249
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250 /**
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251 * Toggles the Viewport's ability to resize itself automatically when its view is
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252 * decreased in size in the horizontal direction. This is disabled by default.
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253 *
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254 * @param track whether this viewport should track its width
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255 * @since 2.0
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256 */
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257 public void setContentsTracksWidth(bool track) {
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258 trackWidth = track;
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259 }
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260
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261 /**
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262 * Sets the horizontal location of the Viewport's view to the passed value.
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263 *
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264 * @param value the new horizontal location
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265 * @since 2.0
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266 */
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267 public void setHorizontalLocation(int value) {
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268 setViewLocation(value, getVerticalRangeModel().getValue());
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269 }
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270
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271 /**
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272 * Sets the horizontal range model to the passed RangeModel.
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273 *
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274 * @param rangeModel the new horizontal range model
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275 * @since 2.0
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276 */
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277 public void setHorizontalRangeModel(RangeModel rangeModel) {
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278 if (horiztonalRangeModel !is null)
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279 horiztonalRangeModel.removePropertyChangeListener(this);
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280 horiztonalRangeModel = rangeModel;
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281 horiztonalRangeModel.addPropertyChangeListener(this);
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282 }
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283
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284 /**
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285 * If <i>value</i> is <code>true</code>, this viewport will ignore any scrolling that
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286 * occurs until this method is called again with <code>false</code>.
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287 *
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288 * @param value whether this viewport should ignore future scrolls
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289 */
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290 public void setIgnoreScroll(bool value) {
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291 ignoreScroll = value;
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292 }
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293
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294 /**
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295 * Sets the vertical location of the Viewport's view to the passed value.
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296 *
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297 * @param value the new vertical location
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298 * @since 2.0
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299 */
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300 public void setVerticalLocation(int value) {
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301 setViewLocation(getHorizontalRangeModel().getValue(), value);
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302 }
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303
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304 /**
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305 * Sets the vertical range model to the passed RangeModel.
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306 *
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307 * @param rangeModel the new vertical RangeModel
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308 * @since 2.0
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309 */
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310 public void setVerticalRangeModel(RangeModel rangeModel) {
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311 if (verticalRangeModel !is null)
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312 verticalRangeModel.removePropertyChangeListener(this);
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313 verticalRangeModel = rangeModel;
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314 verticalRangeModel.addPropertyChangeListener(this);
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315 }
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316
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317 /**
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318 * Sets the location of the Viewport's view to the passed values.
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319 *
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320 * @param x The new x coordinate of the Viewport's view.
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321 * @param y The new y coordinate of the Viewport's view.
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322 * @since 2.0
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323 */
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324 public void setViewLocation(int x, int y) {
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325 if (getHorizontalRangeModel().getValue() !is x)
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326 getHorizontalRangeModel().setValue(x);
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327 if (getVerticalRangeModel().getValue() !is y)
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328 getVerticalRangeModel().setValue(y);
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329 }
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330
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331 /**
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332 * Sets the location of the Viewport's view to the passed Point.
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333 *
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334 * @param p The new location of the Viewport's view.
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335 * @since 2.0
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336 */
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337 public void setViewLocation(Point p) {
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338 setViewLocation(p.x, p.y);
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339 }
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340
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341 /**
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342 * @see IFigure#translateFromParent(Translatable)
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343 */
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344 public void translateFromParent(Translatable t) {
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345 if (useTranslate)
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346 t.performTranslate(
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347 getHorizontalRangeModel().getValue(),
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348 getVerticalRangeModel().getValue()
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349 );
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350 super.translateFromParent(t);
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351 }
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352
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353 /**
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354 * @see IFigure#translateToParent(Translatable)
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355 */
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356 public void translateToParent(Translatable t) {
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357 if (useTranslate)
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358 t.performTranslate(
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359 -getHorizontalRangeModel().getValue(),
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360 -getVerticalRangeModel().getValue()
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361 );
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362 super.translateToParent(t);
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363 }
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364
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365 /**
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366 * Returns <code>true</code> if this viewport uses graphics translation.
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367 * @return whether this viewport uses graphics translation
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368 */
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369 public bool useGraphicsTranslate() {
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370 return useTranslate;
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371 }
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372
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373 /**
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374 * @see IFigure#validate()
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375 */
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376 public void validate() {
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377 super.validate();
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378 readjustScrollBars();
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379 }
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380
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381 }