Mercurial > projects > dwt2
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> |
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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 } |