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annotate dwtx/draw2d/widgets/MultiLineLabel.d @ 103:2d6540440fe6

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Replace static ctors with lazy init.
author Frank Benoit <benoit@tionex.de>
date Sun, 03 Aug 2008 17:01:51 +0200
parents 95307ad235d9
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 dwtx.draw2d.widgets.MultiLineLabel;
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14
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15 import dwt.dwthelper.utils;
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16
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17
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18
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19 import dwt.DWT;
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20 import dwt.accessibility.ACC;
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21 import dwt.accessibility.AccessibleAdapter;
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22 import dwt.accessibility.AccessibleControlAdapter;
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23 import dwt.accessibility.AccessibleControlEvent;
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24 import dwt.accessibility.AccessibleEvent;
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25 import dwt.events.KeyAdapter;
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26 import dwt.events.KeyEvent;
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27 import dwt.graphics.Font;
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28 import dwt.graphics.Image;
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29 import dwt.widgets.Composite;
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30 import dwtx.draw2d.Border;
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31 import dwtx.draw2d.ColorConstants;
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32 import dwtx.draw2d.FigureCanvas;
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33 import dwtx.draw2d.FocusEvent;
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34 import dwtx.draw2d.Graphics;
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35 import dwtx.draw2d.MarginBorder;
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36 import dwtx.draw2d.Viewport;
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37 import dwtx.draw2d.geometry.Point;
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38 import dwtx.draw2d.text.FlowPage;
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39 import dwtx.draw2d.text.TextFlow;
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40 import dwtx.draw2d.widgets.ImageBorder;
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41
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42 /**
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43 * A widget for displaying a multi-line string. The label will have a vertical or
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44 * horizontal scrollbar when needed. Unlike the platform Label, this label is focusable
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45 * and accessible to screen-readers.
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46 *
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47 * @author hudsonr
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48 */
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49 public final class MultiLineLabel : FigureCanvas {
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50
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51 private TextFlow textFlow;
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52 private static Border MARGIN_;
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53 static Border MARGIN(){
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54 if( MARGIN_ is null ){
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55 synchronized( MultiLineLabel.classinfo ){
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56 if( MARGIN_ is null ){
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57 MARGIN_ = new MarginBorder(2);
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58 }
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59 }
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60 }
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61 return MARGIN_;
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62 }
98
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63
103
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64 private Image image;
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65
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66 class FocusableViewport : Viewport {
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67 this() {
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68 super(true);
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69 setFocusTraversable(true);
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70 setBorder(MARGIN);
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71 }
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72
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73 public void handleFocusGained(FocusEvent event) {
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74 super.handleFocusGained(event);
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75 repaint();
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76 }
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77
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78 public void handleFocusLost(FocusEvent event) {
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79 super.handleFocusLost(event);
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80 repaint();
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81 }
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82
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83 protected void paintBorder(Graphics graphics) {
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84 super.paintBorder(graphics);
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85 if (hasFocus()) {
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86 graphics.setForegroundColor(ColorConstants.black);
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87 graphics.setBackgroundColor(ColorConstants.white);
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88 graphics.drawFocus(getBounds().getResized(-1, -1));
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89 }
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90 }
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91 }
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92
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93 /**
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94 * Constructs a new MultiLineLabel with the given parent.
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95 * @param parent the parent
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96 */
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97 public this(Composite parent) {
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98 super(parent);
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99 setViewport(new FocusableViewport());
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100
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101 FlowPage page = new FlowPage();
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102 textFlow = new TextFlow();
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103 page.add(textFlow);
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104
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105 setContents(page);
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106 getViewport().setContentsTracksWidth(true);
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107 addAccessibility();
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108 }
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109
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110 private void addAccessibility() {
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111 getAccessible().addAccessibleControlListener(new class() AccessibleControlAdapter {
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112 public void getRole(AccessibleControlEvent e) {
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113 e.detail = ACC.ROLE_LABEL;
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114 }
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115 public void getState(AccessibleControlEvent e) {
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116 e.detail = ACC.STATE_READONLY;
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117 }
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118 });
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119 getAccessible().addAccessibleListener(new class() AccessibleAdapter {
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120 public void getName(AccessibleEvent e) {
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121 e.result = getText();
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122 }
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123 });
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124 addKeyListener(new class() KeyAdapter {
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125 public void keyPressed(KeyEvent e) {
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126 Point p = getViewport().getViewLocation();
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127 int dy = getFont().getFontData()[0].getHeight();
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128 int dx = dy * 3 / 2;
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129 bool mirrored = (e.widget.getStyle() & DWT.MIRRORED) !is 0;
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130 if (e.keyCode is DWT.ARROW_DOWN) {
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131 scrollToY(p.y + dy / 2);
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132 scrollToY(p.y + dy);
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133 scrollToY(p.y + dy * 3 / 2);
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134 scrollToY(p.y + dy * 2);
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135 } else if (e.keyCode is DWT.ARROW_UP) {
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136 scrollToY(p.y - dy / 2);
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137 scrollToY(p.y - dy);
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138 scrollToY(p.y - dy * 3 / 2);
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139 scrollToY(p.y - dy * 2);
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140 } else if ((!mirrored && e.keyCode is DWT.ARROW_RIGHT)
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141 || (mirrored && e.keyCode is DWT.ARROW_LEFT)) {
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142 scrollToX(p.x + dx);
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143 scrollToX(p.x + dx * 2);
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144 scrollToX(p.x + dx * 3);
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145 } else if ((!mirrored && e.keyCode is DWT.ARROW_LEFT)
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146 || (mirrored && e.keyCode is DWT.ARROW_RIGHT)) {
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147 scrollToX(p.x - dx);
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148 scrollToX(p.x - dx * 2);
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149 scrollToX(p.x - dx * 3);
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150 }
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151 }
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152 });
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153 }
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154
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155 /**
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156 * @see dwt.widgets.Control#setEnabled(bool)
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157 */
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158 public void setEnabled(bool enabled) {
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159 super.setEnabled(enabled);
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160 textFlow.setEnabled(getEnabled());
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161 }
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162
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163 /**
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164 * @return the Image for this label, or <code>null</code> if there is none
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165 * @see #setImage(Image)
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166 */
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167 public Image getImage() {
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168 return image;
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169 }
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170
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171 /**
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172 * Returns the text in this label.
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173 * @return the text
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174 */
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175 public String getText() {
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176 return textFlow.getText();
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177 }
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178
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179 /**
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180 * @see dwt.widgets.Canvas#setFont(dwt.graphics.Font)
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181 */
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182 public void setFont(Font font) {
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183 super.setFont(font);
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184 textFlow.revalidate();
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185 }
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186
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187 /**
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188 * @param image The <code>Image</code> to be used for this label. It can be
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189 * <code>null</code>.
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190 */
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191 public void setImage(Image image) {
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192 this.image = image;
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193 if (image !is null)
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194 setBorder(new ImageBorder(image));
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195 else
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196 setBorder(null);
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197 }
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198
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199 /**
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200 * Sets the text for this label.
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201 * @param text the new text
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202 */
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203 public void setText(String text) {
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204 textFlow.setText(text);
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205 }
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206
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207 }