annotate org.eclipse.ui.forms/src/org/eclipse/ui/forms/widgets/ImageHyperlink.d @ 12:bc29606a740c

Added dwt-addons in original directory structure of eclipse.org
author Frank Benoit <benoit@tionex.de>
date Sat, 14 Mar 2009 18:23:29 +0100
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1 /*******************************************************************************
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2 * Copyright (c) 2000, 2007 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 * Chriss Gross (schtoo@schtoo.com) - fix for 61670
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11 * Port to the D programming language:
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12 * Frank Benoit <benoit@tionex.de>
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13 *******************************************************************************/
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14 module org.eclipse.ui.forms.widgets.ImageHyperlink;
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15
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16 import org.eclipse.ui.forms.widgets.Hyperlink;
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17
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18 import org.eclipse.swt.SWT;
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19 import org.eclipse.swt.graphics.GC;
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20 import org.eclipse.swt.graphics.Image;
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21 import org.eclipse.swt.graphics.Point;
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22 import org.eclipse.swt.graphics.Rectangle;
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23 import org.eclipse.swt.widgets.Composite;
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24 import org.eclipse.swt.widgets.Event;
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25
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26 import java.lang.all;
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27 import java.util.Set;
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28
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29 /**
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30 * This class extends hyperlink widget by adding the capability to render an
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31 * image relative to the text. If no text has been set, only image will be
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32 * shown. Images for hover and active states can be set in addition to the
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33 * normal state image.
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34 * <p>
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35 * When image is taller than the text, additional style can be provided to
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36 * control vertical alignment (supported values are SWT.TOP, SWT.BOTTOM and
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37 * SWT.CENTER).
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38 * <p>
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39 * The class does not need to be sublassed but it is allowed to do so if some
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40 * aspect of the image hyperlink needs to be modified.
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41 *
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42 * @since 3.0
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43 */
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44 public class ImageHyperlink : Hyperlink {
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45 /**
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46 * Amount of pixels between the image and the text (default is 5).
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47 */
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48 public int textSpacing = 5;
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49
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50 private Image image;
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51
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52 private Image hoverImage;
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53
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54 private Image activeImage;
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55
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56 private int state;
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57
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58 private static const int HOVER = 1 << 1;
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59
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60 private static const int ACTIVE = 1 << 2;
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61
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62 private int verticalAlignment = SWT.CENTER;
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63
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64 private int horizontalAlignment = SWT.LEFT;
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65
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66 /**
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67 * Creates the image hyperlink instance.
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68 *
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69 * @param parent
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70 * the control parent
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71 * @param style
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72 * the control style (SWT.WRAP, BOTTOM, TOP, MIDDLE, LEFT, RIGHT)
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73 */
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74 public this(Composite parent, int style) {
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75 super(parent, removeAlignment(style));
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76 extractAlignment(style);
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77 }
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78
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79 /*
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80 * (non-Javadoc)
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81 *
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82 * @see org.eclipse.ui.forms.widgets.AbstractHyperlink#paintHyperlink(org.eclipse.swt.events.PaintEvent)
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83 */
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84 protected void paintHyperlink(GC gc) {
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85 paintHyperlink(gc, getClientArea());
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86 }
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87
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88 protected void paintHyperlink(GC gc, Rectangle bounds) {
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89 Image image = null;
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90 if ((state & ACTIVE) !is 0)
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91 image = activeImage;
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92 else if ((state & HOVER) !is 0)
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93 image = hoverImage;
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94 if (image is null)
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95 image = this.image;
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96 Rectangle ibounds = image !is null ? image.getBounds() : new Rectangle(0, 0, 0, 0);
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97 Point maxsize = computeMaxImageSize();
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98 int spacing = image !is null?textSpacing:0;
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99 int textWidth = bounds.width - maxsize.x - spacing
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100 - marginWidth - marginWidth;
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101 int y = bounds.y+marginHeight + maxsize.y / 2 - ibounds.height / 2;
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102
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103 if (horizontalAlignment is SWT.LEFT) {
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104 int x = bounds.x+marginWidth + maxsize.x / 2 - ibounds.width / 2;
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105 int textX = bounds.x + marginWidth + maxsize.x + spacing;
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106 if (image !is null)
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107 gc.drawImage(image, x, y);
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108 if (getText() !is null)
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109 drawText(gc, bounds, textX, textWidth);
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110 } else if (horizontalAlignment is SWT.RIGHT) {
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111 int x = bounds.x+marginWidth;
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112 if (getText() !is null) {
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113 x += drawText(gc, bounds, x, textWidth);
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114 }
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115 x += maxsize.x / 2 - ibounds.width / 2 + spacing;
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116 if (image !is null)
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117 gc.drawImage(image, x, y);
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118 }
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119 }
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120
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121 private int drawText(GC gc, Rectangle clientArea, int textX, int textWidth) {
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122 Point textSize = computeTextSize(textWidth, SWT.DEFAULT);
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123 int slotHeight = clientArea.height - marginHeight - marginHeight;
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124 int textY;
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125 textWidth = textSize.x;
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126 int textHeight = textSize.y;
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127 if (verticalAlignment is SWT.BOTTOM) {
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128 textY = marginHeight + slotHeight - textHeight;
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129 } else if (verticalAlignment is SWT.CENTER) {
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130 textY = marginHeight + slotHeight / 2 - textHeight / 2;
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131 } else {
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132 textY = marginHeight;
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133 }
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134 paintText(gc, new Rectangle(textX, textY, textWidth, textHeight));
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135 return textWidth;
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136 }
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137
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138 /**
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139 * Computes the control size by reserving space for images in addition to
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140 * text.
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141 *
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142 * @param wHint
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143 * width hint
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144 * @param hHint
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145 * height hint
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146 * @param changed
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147 * if <code>true</code>, any cached layout data should be
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148 * computed anew
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149 */
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150 public Point computeSize(int wHint, int hHint, bool changed) {
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151 checkWidget();
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152 Point isize = computeMaxImageSize();
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153 int spacing = isize.x>0?textSpacing:0;
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154 Point textSize = null;
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155 if (getText() !is null) {
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156 int innerWHint = wHint;
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157 if (wHint !is SWT.DEFAULT) {
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158 innerWHint = wHint - 2 * marginWidth - isize.x - spacing;
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159 }
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160 textSize = super.computeSize(innerWHint, hHint, changed);
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161 }
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162 int width = isize.x;
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163 int height = isize.y;
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164 if (textSize !is null) {
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165 width += spacing;
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166 width += textSize.x;
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167 height = Math.max(height, textSize.y);
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168 }
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169 width += 2 * marginWidth;
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170 height += 2 * marginHeight;
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171 return new Point(width, height);
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172 }
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173
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174 protected void handleEnter(Event e) {
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175 state = HOVER;
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176 super.handleEnter(e);
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177 }
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178
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179 protected void handleExit(Event e) {
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180 state = 0;
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181 super.handleExit(e);
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182 }
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183
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184 protected void handleActivate(Event e) {
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185 state &= ACTIVE;
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186 redraw();
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187 super.handleActivate(e);
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188 state &= ~ACTIVE;
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189 if (!isDisposed())
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190 redraw();
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191 }
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192
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193 /**
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194 * Returns active image.
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195 *
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196 * @return active image or <code>null</code> if not set.
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197 */
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198 public Image getActiveImage() {
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199 return activeImage;
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200 }
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201
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202 /**
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203 * Sets the image to show when link is activated.
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204 *
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205 * @param activeImage
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206 *
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207 */
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208 public void setActiveImage(Image activeImage) {
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209 this.activeImage = activeImage;
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210 }
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211
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212 /**
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213 * Returns the hover image.
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214 *
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215 * @return hover image or <code>null</code> if not set.
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216 */
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217 public Image getHoverImage() {
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218 return hoverImage;
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219 }
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220
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221 /**
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222 * Sets the image to show when link is hover state (on mouse over).
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223 *
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224 * @param hoverImage
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225 */
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226 public void setHoverImage(Image hoverImage) {
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227 this.hoverImage = hoverImage;
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228 }
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229
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230 /**
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231 * Returns the image to show in the normal state.
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232 *
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233 * @return normal image or <code>null</code> if not set.
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234 */
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235 public Image getImage() {
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236 return image;
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237 }
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238
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239 /**
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240 * Sets the image to show when link is in the normal state.
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241 *
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242 * @param image
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243 */
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244 public void setImage(Image image) {
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245 this.image = image;
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246 }
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247
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248 private Point computeMaxImageSize() {
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249 int x = 0;
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250 int y = 0;
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251 if (image !is null) {
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252 x = Math.max(image.getBounds().width, x);
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253 y = Math.max(image.getBounds().height, y);
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254 }
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255 if (hoverImage !is null) {
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256 x = Math.max(hoverImage.getBounds().width, x);
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257 y = Math.max(hoverImage.getBounds().height, y);
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258 }
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259 if (activeImage !is null) {
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260 x = Math.max(activeImage.getBounds().width, x);
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261 y = Math.max(activeImage.getBounds().height, y);
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262 }
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263 return new Point(x, y);
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264 }
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265
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266 private static int removeAlignment(int style) {
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267 int resultStyle = style;
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268 if ((style & SWT.CENTER) !is 0) {
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269 resultStyle &= (~SWT.CENTER);
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270 }
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271 if ((style & SWT.TOP) !is 0) {
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272 resultStyle &= (~SWT.TOP);
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273 }
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274 if ((style & SWT.BOTTOM) !is 0) {
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275 resultStyle &= (~SWT.BOTTOM);
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276 }
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277 if ((style & SWT.LEFT) !is 0) {
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278 resultStyle &= (~SWT.LEFT);
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279 }
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280 if ((style & SWT.RIGHT) !is 0) {
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281 resultStyle &= (~SWT.RIGHT);
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282 }
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283 return resultStyle;
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284 }
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285
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286 private void extractAlignment(int style) {
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287 if ((style & SWT.CENTER) !is 0) {
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288 verticalAlignment = SWT.CENTER;
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289 } else if ((style & SWT.TOP) !is 0) {
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290 verticalAlignment = SWT.TOP;
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291 } else if ((style & SWT.BOTTOM) !is 0) {
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292 verticalAlignment = SWT.BOTTOM;
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293 }
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294 if ((style & SWT.LEFT) !is 0) {
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295 horizontalAlignment = SWT.LEFT;
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296 } else if ((style & SWT.RIGHT) !is 0) {
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297 horizontalAlignment = SWT.RIGHT;
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298 }
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299 }
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300 }