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1 /*******************************************************************************
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2 * Copyright (c) 2000, 2008 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.swt.custom.CLabel;
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14
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15
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16 import org.eclipse.swt.SWT;
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17 import org.eclipse.swt.SWTException;
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18 import org.eclipse.swt.accessibility.ACC;
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19 import org.eclipse.swt.accessibility.Accessible;
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20 import org.eclipse.swt.accessibility.AccessibleAdapter;
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21 import org.eclipse.swt.accessibility.AccessibleControlAdapter;
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22 import org.eclipse.swt.accessibility.AccessibleControlEvent;
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23 import org.eclipse.swt.accessibility.AccessibleEvent;
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24 import org.eclipse.swt.events.DisposeEvent;
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25 import org.eclipse.swt.events.DisposeListener;
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26 import org.eclipse.swt.events.PaintEvent;
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27 import org.eclipse.swt.events.PaintListener;
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28 import org.eclipse.swt.events.TraverseEvent;
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29 import org.eclipse.swt.events.TraverseListener;
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30 import org.eclipse.swt.graphics.Color;
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31 import org.eclipse.swt.graphics.Font;
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32 import org.eclipse.swt.graphics.GC;
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33 import org.eclipse.swt.graphics.Image;
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34 import org.eclipse.swt.graphics.Point;
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35 import org.eclipse.swt.graphics.Rectangle;
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36 import org.eclipse.swt.graphics.TextLayout;
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37 import org.eclipse.swt.widgets.Canvas;
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38 import org.eclipse.swt.widgets.Composite;
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39 import org.eclipse.swt.widgets.Control;
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40 import org.eclipse.swt.widgets.Display;
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41 import java.lang.all;
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42
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48
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43 version(Tango){
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25
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44 static import tango.text.Unicode;
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45 static import tango.text.convert.Utf;
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48
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46 } else { // Phobos
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47 }
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25
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48
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49 /**
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50 * A Label which supports aligned text and/or an image and different border styles.
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51 * <p>
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52 * If there is not enough space a CLabel uses the following strategy to fit the
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53 * information into the available space:
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54 * <pre>
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55 * ignores the indent in left align mode
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56 * ignores the image and the gap
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57 * shortens the text by replacing the center portion of the label with an ellipsis
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58 * shortens the text by removing the center portion of the label
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59 * </pre>
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60 * <p>
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61 * <dl>
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62 * <dt><b>Styles:</b>
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63 * <dd>LEFT, RIGHT, CENTER, SHADOW_IN, SHADOW_OUT, SHADOW_NONE</dd>
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64 * <dt><b>Events:</b>
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65 * <dd></dd>
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66 * </dl>
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67 *
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68 * </p><p>
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69 * IMPORTANT: This class is <em>not</em> intended to be subclassed.
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70 * </p>
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71 *
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72 * @see <a href="http://www.eclipse.org/swt/examples.php">SWT Example: CustomControlExample</a>
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73 * @see <a href="http://www.eclipse.org/swt/">Sample code and further information</a>
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74 */
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75 public class CLabel : Canvas {
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76
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77 alias Canvas.computeSize computeSize;
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78
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79 /** Gap between icon and text */
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80 private static const int GAP = 5;
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81 /** Left and right margins */
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82 private static const int INDENT = 3;
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83 /** a string inserted in the middle of text that has been shortened */
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84 private static const String ELLIPSIS = "..."; //$NON-NLS-1$ // could use the ellipsis glyph on some platforms "\u2026"
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85 /** the alignment. Either CENTER, RIGHT, LEFT. Default is LEFT*/
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86 private int align_ = SWT.LEFT;
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87 private int hIndent = INDENT;
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88 private int vIndent = INDENT;
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89 /** the current text */
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90 private String text;
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91 /** the current icon */
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92 private Image image;
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93 // The tooltip is used for two purposes - the application can set
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94 // a tooltip or the tooltip can be used to display the full text when the
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95 // the text has been truncated due to the label being too short.
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96 // The appToolTip stores the tooltip set by the application. Control.tooltiptext
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97 // contains whatever tooltip is currently being displayed.
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98 private String appToolTipText;
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99
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100 private Image backgroundImage;
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101 private Color[] gradientColors;
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102 private int[] gradientPercents;
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103 private bool gradientVertical;
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104 private Color background;
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105
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106 private static int DRAW_FLAGS = SWT.DRAW_MNEMONIC | SWT.DRAW_TAB | SWT.DRAW_TRANSPARENT | SWT.DRAW_DELIMITER;
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107
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108 /**
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109 * Constructs a new instance of this class given its parent
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110 * and a style value describing its behavior and appearance.
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111 * <p>
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112 * The style value is either one of the style constants defined in
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113 * class <code>SWT</code> which is applicable to instances of this
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114 * class, or must be built by <em>bitwise OR</em>'ing together
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115 * (that is, using the <code>int</code> "|" operator) two or more
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116 * of those <code>SWT</code> style constants. The class description
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117 * lists the style constants that are applicable to the class.
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118 * Style bits are also inherited from superclasses.
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119 * </p>
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120 *
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121 * @param parent a widget which will be the parent of the new instance (cannot be null)
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122 * @param style the style of widget to construct
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123 *
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124 * @exception IllegalArgumentException <ul>
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125 * <li>ERROR_NULL_ARGUMENT - if the parent is null</li>
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126 * </ul>
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127 * @exception SWTException <ul>
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128 * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the parent</li>
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129 * </ul>
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130 *
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131 * @see SWT#LEFT
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132 * @see SWT#RIGHT
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133 * @see SWT#CENTER
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134 * @see SWT#SHADOW_IN
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135 * @see SWT#SHADOW_OUT
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136 * @see SWT#SHADOW_NONE
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137 * @see #getStyle()
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138 */
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139 public this(Composite parent, int style) {
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140 super(parent, checkStyle(style));
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141 if ((style & (SWT.CENTER | SWT.RIGHT)) is 0) style |= SWT.LEFT;
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142 if ((style & SWT.CENTER) !is 0) align_ = SWT.CENTER;
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143 if ((style & SWT.RIGHT) !is 0) align_ = SWT.RIGHT;
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144 if ((style & SWT.LEFT) !is 0) align_ = SWT.LEFT;
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145
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146 addPaintListener(new class() PaintListener{
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147 public void paintControl(PaintEvent event) {
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148 onPaint(event);
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149 }
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150 });
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151
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152 addDisposeListener(new class() DisposeListener{
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153 public void widgetDisposed(DisposeEvent event) {
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154 onDispose(event);
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155 }
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156 });
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157
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158 addTraverseListener(new class() TraverseListener {
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159 public void keyTraversed(TraverseEvent event) {
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160 if (event.detail is SWT.TRAVERSE_MNEMONIC) {
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161 onMnemonic(event);
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162 }
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163 }
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164 });
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165
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166 initAccessible();
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167
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168 }
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169 /**
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170 * Check the style bits to ensure that no invalid styles are applied.
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171 */
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172 private static int checkStyle (int style) {
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173 if ((style & SWT.BORDER) !is 0) style |= SWT.SHADOW_IN;
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174 int mask = SWT.SHADOW_IN | SWT.SHADOW_OUT | SWT.SHADOW_NONE | SWT.LEFT_TO_RIGHT | SWT.RIGHT_TO_LEFT;
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175 style = style & mask;
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176 return style |= SWT.NO_FOCUS | SWT.DOUBLE_BUFFERED;
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177 }
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178
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179 //protected void checkSubclass () {
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180 // String name = getClass().getName ();
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181 // String validName = CLabel.class.getName();
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182 // if (!validName.equals(name)) {
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183 // SWT.error (SWT.ERROR_INVALID_SUBCLASS);
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184 // }
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185 //}
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186
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187 public override Point computeSize(int wHint, int hHint, bool changed) {
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188 checkWidget();
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189 Point e = getTotalSize(image, text);
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190 if (wHint is SWT.DEFAULT){
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191 e.x += 2*hIndent;
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192 } else {
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193 e.x = wHint;
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194 }
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195 if (hHint is SWT.DEFAULT) {
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196 e.y += 2*vIndent;
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197 } else {
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198 e.y = hHint;
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199 }
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200 return e;
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201 }
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202 /**
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203 * Draw a rectangle in the given colors.
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204 */
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205 private void drawBevelRect(GC gc, int x, int y, int w, int h, Color topleft, Color bottomright) {
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206 gc.setForeground(bottomright);
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207 gc.drawLine(x+w, y, x+w, y+h);
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208 gc.drawLine(x, y+h, x+w, y+h);
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209
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210 gc.setForeground(topleft);
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211 gc.drawLine(x, y, x+w-1, y);
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212 gc.drawLine(x, y, x, y+h-1);
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213 }
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214 /*
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215 * Return the lowercase of the first non-'&' character following
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216 * an '&' character in the given string. If there are no '&'
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217 * characters in the given string, return '\0'.
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218 */
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219 dchar _findMnemonic (String string) {
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220 if (string is null) return '\0';
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221 int index = 0;
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222 int length = string.length;
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223 do {
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224 while (index < length && string[index] !is '&') index++;
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225 if (++index >= length) return '\0';
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226 if (string[index] !is '&') {
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227 dchar[1] tmp; uint ate;
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228 dchar[] tmp2 = tango.text.convert.Utf.toString32( string[index .. Math.min( index + 4, string.length ) ], tmp, &ate );
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229 assert( tmp2.length == 1 );
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230 return tango.text.Unicode.toLower( tmp2 )[0];
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231 }
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232 index++;
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233 } while (index < length);
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234 return '\0';
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235 }
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236 /**
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237 * Returns the alignment.
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238 * The alignment style (LEFT, CENTER or RIGHT) is returned.
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239 *
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240 * @return SWT.LEFT, SWT.RIGHT or SWT.CENTER
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241 */
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242 public int getAlignment() {
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243 //checkWidget();
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244 return align_;
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245 }
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246 /**
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247 * Return the CLabel's image or <code>null</code>.
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248 *
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249 * @return the image of the label or null
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250 */
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251 public Image getImage() {
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252 //checkWidget();
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253 return image;
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254 }
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255 /**
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256 * Compute the minimum size.
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257 */
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258 private Point getTotalSize(Image image, String text) {
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259 Point size = new Point(0, 0);
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260
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261 if (image !is null) {
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262 Rectangle r = image.getBounds();
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263 size.x += r.width;
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264 size.y += r.height;
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265 }
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266
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267 GC gc = new GC(this);
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268 if (text !is null && text.length > 0) {
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269 Point e = gc.textExtent(text, DRAW_FLAGS);
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270 size.x += e.x;
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271 size.y = Math.max(size.y, e.y);
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272 if (image !is null) size.x += GAP;
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273 } else {
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274 size.y = Math.max(size.y, gc.getFontMetrics().getHeight());
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275 }
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276 gc.dispose();
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277
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278 return size;
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279 }
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280 public override int getStyle () {
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281 int style = super.getStyle();
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282 switch (align_) {
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283 case SWT.RIGHT: style |= SWT.RIGHT; break;
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284 case SWT.CENTER: style |= SWT.CENTER; break;
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285 case SWT.LEFT: style |= SWT.LEFT; break;
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286 default:
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287 }
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288 return style;
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289 }
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290
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291 /**
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292 * Return the Label's text.
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293 *
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294 * @return the text of the label or null
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295 */
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296 public String getText() {
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297 //checkWidget();
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298 return text;
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299 }
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300 public override String getToolTipText () {
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301 checkWidget();
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302 return appToolTipText;
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303 }
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304 private void initAccessible() {
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305 Accessible accessible = getAccessible();
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306 accessible.addAccessibleListener(new class() AccessibleAdapter {
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307 public void getName(AccessibleEvent e) {
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308 e.result = getText();
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309 }
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310
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311 public void getHelp(AccessibleEvent e) {
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312 e.result = getToolTipText();
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313 }
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314
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315 public void getKeyboardShortcut(AccessibleEvent e) {
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316 dchar mnemonic = _findMnemonic(this.outer.text);
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317 if (mnemonic !is '\0') {
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318 dchar[1] d;
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319 d[0] = mnemonic;
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320 e.result = "Alt+" ~ tango.text.convert.Utf.toString(d); //$NON-NLS-1$
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321 }
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322 }
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323 });
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324
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325 accessible.addAccessibleControlListener(new class() AccessibleControlAdapter {
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326 public void getChildAtPoint(AccessibleControlEvent e) {
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327 e.childID = ACC.CHILDID_SELF;
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328 }
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329
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330 public void getLocation(AccessibleControlEvent e) {
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331 Rectangle rect = getDisplay().map(getParent(), null, getBounds());
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332 e.x = rect.x;
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333 e.y = rect.y;
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334 e.width = rect.width;
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335 e.height = rect.height;
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336 }
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337
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338 public void getChildCount(AccessibleControlEvent e) {
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339 e.detail = 0;
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340 }
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341
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342 public void getRole(AccessibleControlEvent e) {
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343 e.detail = ACC.ROLE_LABEL;
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344 }
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345
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346 public void getState(AccessibleControlEvent e) {
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347 e.detail = ACC.STATE_READONLY;
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348 }
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349 });
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350 }
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351 void onDispose(DisposeEvent event) {
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352 gradientColors = null;
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353 gradientPercents = null;
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354 backgroundImage = null;
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355 text = null;
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356 image = null;
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357 appToolTipText = null;
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358 }
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359 void onMnemonic(TraverseEvent event) {
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360 dchar mnemonic = _findMnemonic(text);
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361 if (mnemonic is '\0') return;
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362 dchar[1] d; uint ate;
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363 auto r = tango.text.convert.Utf.toString32( [event.character][], d, &ate );
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364 if (tango.text.Unicode.toLower(r)[0] !is mnemonic) return;
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365 Composite control = this.getParent();
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366 while (control !is null) {
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367 Control [] children = control.getChildren();
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368 int index = 0;
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369 while (index < children.length) {
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370 if (children [index] is this) break;
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371 index++;
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372 }
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373 index++;
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374 if (index < children.length) {
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375 if (children [index].setFocus ()) {
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376 event.doit = true;
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377 event.detail = SWT.TRAVERSE_NONE;
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378 }
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379 }
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380 control = control.getParent();
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381 }
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382 }
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383
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384 void onPaint(PaintEvent event) {
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385 Rectangle rect = getClientArea();
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386 if (rect.width is 0 || rect.height is 0) return;
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387
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388 bool shortenText_ = false;
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389 String t = text;
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390 Image img = image;
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391 int availableWidth = Math.max(0, rect.width - 2*hIndent);
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392 Point extent = getTotalSize(img, t);
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393 if (extent.x > availableWidth) {
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394 img = null;
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395 extent = getTotalSize(img, t);
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396 if (extent.x > availableWidth) {
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397 shortenText_ = true;
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398 }
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399 }
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400
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|
|
401 GC gc = event.gc;
|
|
|
402 String[] lines = text is null ? null : splitString(text);
|
|
|
403
|
|
|
404 // shorten the text
|
|
|
405 if (shortenText_) {
|
|
|
406 extent.x = 0;
|
|
|
407 for(int i = 0; i < lines.length; i++) {
|
|
|
408 Point e = gc.textExtent(lines[i], DRAW_FLAGS);
|
|
|
409 if (e.x > availableWidth) {
|
|
|
410 lines[i] = shortenText(gc, lines[i], availableWidth);
|
|
|
411 extent.x = Math.max(extent.x, getTotalSize(null, lines[i]).x);
|
|
|
412 } else {
|
|
|
413 extent.x = Math.max(extent.x, e.x);
|
|
|
414 }
|
|
|
415 }
|
|
|
416 if (appToolTipText is null) {
|
|
|
417 super.setToolTipText(text);
|
|
|
418 }
|
|
|
419 } else {
|
|
|
420 super.setToolTipText(appToolTipText);
|
|
|
421 }
|
|
|
422
|
|
|
423 // determine horizontal position
|
|
|
424 int x = rect.x + hIndent;
|
|
|
425 if (align_ is SWT.CENTER) {
|
|
|
426 x = (rect.width - extent.x)/2;
|
|
|
427 }
|
|
|
428 if (align_ is SWT.RIGHT) {
|
|
|
429 x = rect.width - hIndent - extent.x;
|
|
|
430 }
|
|
|
431
|
|
|
432 // draw a background image behind the text
|
|
|
433 try {
|
|
|
434 if (backgroundImage !is null) {
|
|
|
435 // draw a background image behind the text
|
|
|
436 Rectangle imageRect = backgroundImage.getBounds();
|
|
|
437 // tile image to fill space
|
|
|
438 gc.setBackground(getBackground());
|
|
|
439 gc.fillRectangle(rect);
|
|
|
440 int xPos = 0;
|
|
|
441 while (xPos < rect.width) {
|
|
|
442 int yPos = 0;
|
|
|
443 while (yPos < rect.height) {
|
|
|
444 gc.drawImage(backgroundImage, xPos, yPos);
|
|
|
445 yPos += imageRect.height;
|
|
|
446 }
|
|
|
447 xPos += imageRect.width;
|
|
|
448 }
|
|
|
449 } else if (gradientColors !is null) {
|
|
|
450 // draw a gradient behind the text
|
|
|
451 final Color oldBackground = gc.getBackground();
|
|
|
452 if (gradientColors.length is 1) {
|
|
|
453 if (gradientColors[0] !is null) gc.setBackground(gradientColors[0]);
|
|
|
454 gc.fillRectangle(0, 0, rect.width, rect.height);
|
|
|
455 } else {
|
|
|
456 final Color oldForeground = gc.getForeground();
|
|
|
457 Color lastColor = gradientColors[0];
|
|
|
458 if (lastColor is null) lastColor = oldBackground;
|
|
|
459 int pos = 0;
|
|
|
460 for (int i = 0; i < gradientPercents.length; ++i) {
|
|
|
461 gc.setForeground(lastColor);
|
|
|
462 lastColor = gradientColors[i + 1];
|
|
|
463 if (lastColor is null) lastColor = oldBackground;
|
|
|
464 gc.setBackground(lastColor);
|
|
|
465 if (gradientVertical) {
|
|
|
466 final int gradientHeight = (gradientPercents[i] * rect.height / 100) - pos;
|
|
|
467 gc.fillGradientRectangle(0, pos, rect.width, gradientHeight, true);
|
|
|
468 pos += gradientHeight;
|
|
|
469 } else {
|
|
|
470 final int gradientWidth = (gradientPercents[i] * rect.width / 100) - pos;
|
|
|
471 gc.fillGradientRectangle(pos, 0, gradientWidth, rect.height, false);
|
|
|
472 pos += gradientWidth;
|
|
|
473 }
|
|
|
474 }
|
|
|
475 if (gradientVertical && pos < rect.height) {
|
|
|
476 gc.setBackground(getBackground());
|
|
|
477 gc.fillRectangle(0, pos, rect.width, rect.height - pos);
|
|
|
478 }
|
|
|
479 if (!gradientVertical && pos < rect.width) {
|
|
|
480 gc.setBackground(getBackground());
|
|
|
481 gc.fillRectangle(pos, 0, rect.width - pos, rect.height);
|
|
|
482 }
|
|
|
483 gc.setForeground(oldForeground);
|
|
|
484 }
|
|
|
485 gc.setBackground(oldBackground);
|
|
|
486 } else {
|
|
|
487 if (background !is null || (getStyle() & SWT.DOUBLE_BUFFERED) is 0) {
|
|
|
488 gc.setBackground(getBackground());
|
|
|
489 gc.fillRectangle(rect);
|
|
|
490 }
|
|
|
491 }
|
|
|
492 } catch (SWTException e) {
|
|
|
493 if ((getStyle() & SWT.DOUBLE_BUFFERED) is 0) {
|
|
|
494 gc.setBackground(getBackground());
|
|
|
495 gc.fillRectangle(rect);
|
|
|
496 }
|
|
|
497 }
|
|
|
498
|
|
|
499 // draw border
|
|
|
500 int style = getStyle();
|
|
|
501 if ((style & SWT.SHADOW_IN) !is 0 || (style & SWT.SHADOW_OUT) !is 0) {
|
|
|
502 paintBorder(gc, rect);
|
|
|
503 }
|
|
|
504
|
|
|
505 // draw the image
|
|
|
506 if (img !is null) {
|
|
|
507 Rectangle imageRect = img.getBounds();
|
|
|
508 gc.drawImage(img, 0, 0, imageRect.width, imageRect.height,
|
|
|
509 x, (rect.height-imageRect.height)/2, imageRect.width, imageRect.height);
|
|
|
510 x += imageRect.width + GAP;
|
|
|
511 extent.x -= imageRect.width + GAP;
|
|
|
512 }
|
|
|
513 // draw the text
|
|
|
514 if (lines !is null) {
|
|
|
515 int lineHeight = gc.getFontMetrics().getHeight();
|
|
|
516 int textHeight = lines.length * lineHeight;
|
|
|
517 int lineY = Math.max(vIndent, rect.y + (rect.height - textHeight) / 2);
|
|
|
518 gc.setForeground(getForeground());
|
|
|
519 for (int i = 0; i < lines.length; i++) {
|
|
|
520 int lineX = x;
|
|
|
521 if (lines.length > 1) {
|
|
|
522 if (align_ is SWT.CENTER) {
|
|
|
523 int lineWidth = gc.textExtent(lines[i], DRAW_FLAGS).x;
|
|
|
524 lineX = x + Math.max(0, (extent.x - lineWidth) / 2);
|
|
|
525 }
|
|
|
526 if (align_ is SWT.RIGHT) {
|
|
|
527 int lineWidth = gc.textExtent(lines[i], DRAW_FLAGS).x;
|
|
|
528 lineX = Math.max(x, rect.x + rect.width - hIndent - lineWidth);
|
|
|
529 }
|
|
|
530 }
|
|
|
531 gc.drawText(lines[i], lineX, lineY, DRAW_FLAGS);
|
|
|
532 lineY += lineHeight;
|
|
|
533 }
|
|
|
534 }
|
|
|
535 }
|
|
|
536 /**
|
|
|
537 * Paint the Label's border.
|
|
|
538 */
|
|
|
539 private void paintBorder(GC gc, Rectangle r) {
|
|
|
540 Display disp= getDisplay();
|
|
|
541
|
|
|
542 Color c1 = null;
|
|
|
543 Color c2 = null;
|
|
|
544
|
|
|
545 int style = getStyle();
|
|
|
546 if ((style & SWT.SHADOW_IN) !is 0) {
|
|
|
547 c1 = disp.getSystemColor(SWT.COLOR_WIDGET_NORMAL_SHADOW);
|
|
|
548 c2 = disp.getSystemColor(SWT.COLOR_WIDGET_HIGHLIGHT_SHADOW);
|
|
|
549 }
|
|
|
550 if ((style & SWT.SHADOW_OUT) !is 0) {
|
|
|
551 c1 = disp.getSystemColor(SWT.COLOR_WIDGET_LIGHT_SHADOW);
|
|
|
552 c2 = disp.getSystemColor(SWT.COLOR_WIDGET_NORMAL_SHADOW);
|
|
|
553 }
|
|
|
554
|
|
|
555 if (c1 !is null && c2 !is null) {
|
|
|
556 gc.setLineWidth(1);
|
|
|
557 drawBevelRect(gc, r.x, r.y, r.width-1, r.height-1, c1, c2);
|
|
|
558 }
|
|
|
559 }
|
|
|
560 /**
|
|
|
561 * Set the alignment of the CLabel.
|
|
|
562 * Use the values LEFT, CENTER and RIGHT to align image and text within the available space.
|
|
|
563 *
|
|
|
564 * @param align the alignment style of LEFT, RIGHT or CENTER
|
|
|
565 *
|
|
|
566 * @exception SWTException <ul>
|
|
|
567 * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
|
|
|
568 * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
|
|
|
569 * <li>ERROR_INVALID_ARGUMENT - if the value of align is not one of SWT.LEFT, SWT.RIGHT or SWT.CENTER</li>
|
|
|
570 * </ul>
|
|
|
571 */
|
|
|
572 public void setAlignment(int align_) {
|
|
|
573 checkWidget();
|
|
|
574 if (align_ !is SWT.LEFT && align_ !is SWT.RIGHT && align_ !is SWT.CENTER) {
|
|
|
575 SWT.error(SWT.ERROR_INVALID_ARGUMENT);
|
|
|
576 }
|
|
|
577 if (this.align_ !is align_) {
|
|
|
578 this.align_ = align_;
|
|
|
579 redraw();
|
|
|
580 }
|
|
|
581 }
|
|
|
582
|
|
|
583 public override void setBackground (Color color) {
|
|
|
584 super.setBackground (color);
|
|
|
585 // Are these settings the same as before?
|
|
|
586 if (backgroundImage is null &&
|
|
|
587 gradientColors is null &&
|
|
|
588 gradientPercents is null) {
|
|
|
589 if (color is null) {
|
|
|
590 if (background is null) return;
|
|
|
591 } else {
|
|
|
592 if (color ==/*eq*/ background) return;
|
|
|
593 }
|
|
|
594 }
|
|
|
595 background = color;
|
|
|
596 backgroundImage = null;
|
|
|
597 gradientColors = null;
|
|
|
598 gradientPercents = null;
|
|
|
599 redraw ();
|
|
|
600 }
|
|
|
601
|
|
|
602 /**
|
|
|
603 * Specify a gradient of colours to be drawn in the background of the CLabel.
|
|
|
604 * <p>For example, to draw a gradient that varies from dark blue to blue and then to
|
|
|
605 * white and stays white for the right half of the label, use the following call
|
|
|
606 * to setBackground:</p>
|
|
|
607 * <pre>
|
|
|
608 * clabel.setBackground(new Color[]{display.getSystemColor(SWT.COLOR_DARK_BLUE),
|
|
|
609 * display.getSystemColor(SWT.COLOR_BLUE),
|
|
|
610 * display.getSystemColor(SWT.COLOR_WHITE),
|
|
|
611 * display.getSystemColor(SWT.COLOR_WHITE)},
|
|
|
612 * new int[] {25, 50, 100});
|
|
|
613 * </pre>
|
|
|
614 *
|
|
|
615 * @param colors an array of Color that specifies the colors to appear in the gradient
|
|
|
616 * in order of appearance from left to right; The value <code>null</code>
|
|
|
617 * clears the background gradient; the value <code>null</code> can be used
|
|
|
618 * inside the array of Color to specify the background color.
|
|
|
619 * @param percents an array of integers between 0 and 100 specifying the percent of the width
|
|
|
620 * of the widget at which the color should change; the size of the percents
|
|
|
621 * array must be one less than the size of the colors array.
|
|
|
622 *
|
|
|
623 * @exception SWTException <ul>
|
|
|
624 * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
|
|
|
625 * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
|
|
|
626 * <li>ERROR_INVALID_ARGUMENT - if the values of colors and percents are not consistent</li>
|
|
|
627 * </ul>
|
|
|
628 */
|
|
|
629 public void setBackground(Color[] colors, int[] percents) {
|
|
|
630 setBackground(colors, percents, false);
|
|
|
631 }
|
|
|
632 /**
|
|
|
633 * Specify a gradient of colours to be drawn in the background of the CLabel.
|
|
|
634 * <p>For example, to draw a gradient that varies from dark blue to white in the vertical,
|
|
|
635 * direction use the following call
|
|
|
636 * to setBackground:</p>
|
|
|
637 * <pre>
|
|
|
638 * clabel.setBackground(new Color[]{display.getSystemColor(SWT.COLOR_DARK_BLUE),
|
|
|
639 * display.getSystemColor(SWT.COLOR_WHITE)},
|
|
|
640 * new int[] {100}, true);
|
|
|
641 * </pre>
|
|
|
642 *
|
|
|
643 * @param colors an array of Color that specifies the colors to appear in the gradient
|
|
|
644 * in order of appearance from left/top to right/bottom; The value <code>null</code>
|
|
|
645 * clears the background gradient; the value <code>null</code> can be used
|
|
|
646 * inside the array of Color to specify the background color.
|
|
|
647 * @param percents an array of integers between 0 and 100 specifying the percent of the width/height
|
|
|
648 * of the widget at which the color should change; the size of the percents
|
|
|
649 * array must be one less than the size of the colors array.
|
|
|
650 * @param vertical indicate the direction of the gradient. True is vertical and false is horizontal.
|
|
|
651 *
|
|
|
652 * @exception SWTException <ul>
|
|
|
653 * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
|
|
|
654 * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
|
|
|
655 * <li>ERROR_INVALID_ARGUMENT - if the values of colors and percents are not consistent</li>
|
|
|
656 * </ul>
|
|
|
657 *
|
|
|
658 * @since 3.0
|
|
|
659 */
|
|
|
660 public void setBackground(Color[] colors, int[] percents, bool vertical) {
|
|
|
661 checkWidget();
|
|
|
662 if (colors !is null) {
|
|
|
663 if (percents is null || percents.length !is colors.length - 1) {
|
|
|
664 SWT.error(SWT.ERROR_INVALID_ARGUMENT);
|
|
|
665 }
|
|
|
666 if (getDisplay().getDepth() < 15) {
|
|
|
667 // Don't use gradients on low color displays
|
|
|
668 colors = [colors[colors.length - 1]];
|
|
|
669 percents = null;
|
|
|
670 }
|
|
|
671 for (int i = 0; i < percents.length; i++) {
|
|
|
672 if (percents[i] < 0 || percents[i] > 100) {
|
|
|
673 SWT.error(SWT.ERROR_INVALID_ARGUMENT);
|
|
|
674 }
|
|
|
675 if (i > 0 && percents[i] < percents[i-1]) {
|
|
|
676 SWT.error(SWT.ERROR_INVALID_ARGUMENT);
|
|
|
677 }
|
|
|
678 }
|
|
|
679 }
|
|
|
680
|
|
|
681 // Are these settings the same as before?
|
|
|
682 final Color background = getBackground();
|
|
|
683 if (backgroundImage is null) {
|
|
|
684 if ((gradientColors !is null) && (colors !is null) &&
|
|
|
685 (gradientColors.length is colors.length)) {
|
|
|
686 bool same = false;
|
|
|
687 for (int i = 0; i < gradientColors.length; i++) {
|
|
|
688 same = (gradientColors[i] is colors[i]) ||
|
|
|
689 ((gradientColors[i] is null) && (colors[i] is background)) ||
|
|
|
690 ((gradientColors[i] is background) && (colors[i] is null));
|
|
|
691 if (!same) break;
|
|
|
692 }
|
|
|
693 if (same) {
|
|
|
694 for (int i = 0; i < gradientPercents.length; i++) {
|
|
|
695 same = gradientPercents[i] is percents[i];
|
|
|
696 if (!same) break;
|
|
|
697 }
|
|
|
698 }
|
|
|
699 if (same && this.gradientVertical is vertical) return;
|
|
|
700 }
|
|
|
701 } else {
|
|
|
702 backgroundImage = null;
|
|
|
703 }
|
|
|
704 // Store the new settings
|
|
|
705 if (colors is null) {
|
|
|
706 gradientColors = null;
|
|
|
707 gradientPercents = null;
|
|
|
708 gradientVertical = false;
|
|
|
709 } else {
|
|
|
710 gradientColors = new Color[colors.length];
|
|
|
711 for (int i = 0; i < colors.length; ++i)
|
|
|
712 gradientColors[i] = (colors[i] !is null) ? colors[i] : background;
|
|
|
713 gradientPercents = new int[percents.length];
|
|
|
714 for (int i = 0; i < percents.length; ++i)
|
|
|
715 gradientPercents[i] = percents[i];
|
|
|
716 gradientVertical = vertical;
|
|
|
717 }
|
|
|
718 // Refresh with the new settings
|
|
|
719 redraw();
|
|
|
720 }
|
|
|
721 /**
|
|
|
722 * Set the image to be drawn in the background of the label.
|
|
|
723 *
|
|
|
724 * @param image the image to be drawn in the background
|
|
|
725 *
|
|
|
726 * @exception SWTException <ul>
|
|
|
727 * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
|
|
|
728 * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
|
|
|
729 * </ul>
|
|
|
730 */
|
|
|
731 public void setBackground(Image image) {
|
|
|
732 checkWidget();
|
|
|
733 if (image is backgroundImage) return;
|
|
|
734 if (image !is null) {
|
|
|
735 gradientColors = null;
|
|
|
736 gradientPercents = null;
|
|
|
737 }
|
|
|
738 backgroundImage = image;
|
|
|
739 redraw();
|
|
|
740
|
|
|
741 }
|
|
|
742 public override void setFont(Font font) {
|
|
|
743 super.setFont(font);
|
|
|
744 redraw();
|
|
|
745 }
|
|
|
746 /**
|
|
|
747 * Set the label's Image.
|
|
|
748 * The value <code>null</code> clears it.
|
|
|
749 *
|
|
|
750 * @param image the image to be displayed in the label or null
|
|
|
751 *
|
|
|
752 * @exception SWTException <ul>
|
|
|
753 * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
|
|
|
754 * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
|
|
|
755 * </ul>
|
|
|
756 */
|
|
|
757 public void setImage(Image image) {
|
|
|
758 checkWidget();
|
|
|
759 if (image !is this.image) {
|
|
|
760 this.image = image;
|
|
|
761 redraw();
|
|
|
762 }
|
|
|
763 }
|
|
|
764 /**
|
|
|
765 * Set the label's text.
|
|
|
766 * The value <code>null</code> clears it.
|
|
|
767 *
|
|
|
768 * @param text the text to be displayed in the label or null
|
|
|
769 *
|
|
|
770 * @exception SWTException <ul>
|
|
|
771 * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
|
|
|
772 * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
|
|
|
773 * </ul>
|
|
|
774 */
|
|
|
775 public void setText(String text) {
|
|
|
776 checkWidget();
|
|
|
777 if (text is null) text = ""; //$NON-NLS-1$
|
|
|
778 if ( text !=/*eq*/ this.text) {
|
|
|
779 this.text = text;
|
|
|
780 redraw();
|
|
|
781 }
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|
782 }
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783 public override void setToolTipText (String string) {
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|
|
784 super.setToolTipText (string);
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|
|
785 appToolTipText = super.getToolTipText();
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|
|
786 }
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|
|
787 /**
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|
788 * Shorten the given text <code>t</code> so that its length doesn't exceed
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|
|
789 * the given width. The default implementation replaces characters in the
|
|
|
790 * center of the original string with an ellipsis ("...").
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|
|
791 * Override if you need a different strategy.
|
|
|
792 *
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|
|
793 * @param gc the gc to use for text measurement
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|
|
794 * @param t the text to shorten
|
|
|
795 * @param width the width to shorten the text to, in pixels
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|
|
796 * @return the shortened text
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|
|
797 */
|
|
|
798 protected String shortenText(GC gc, String t, int width) {
|
|
|
799 if (t is null) return null;
|
|
|
800 int w = gc.textExtent(ELLIPSIS, DRAW_FLAGS).x;
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|
|
801 if (width<=w) return t;
|
|
|
802 int l = t.length;
|
|
|
803 int max = l/2;
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|
|
804 int min = 0;
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|
|
805 int mid = (max+min)/2 - 1;
|
|
|
806 if (mid <= 0) return t;
|
|
|
807 TextLayout layout = new TextLayout (getDisplay());
|
|
|
808 layout.setText(t);
|
|
|
809 mid = validateOffset(layout, mid);
|
|
|
810 while (min < mid && mid < max) {
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|
|
811 String s1 = t[0 .. mid].dup;
|
|
|
812 String s2 = t.substring(validateOffset(layout, l-mid), l);
|
|
|
813 int l1 = gc.textExtent(s1, DRAW_FLAGS).x;
|
|
|
814 int l2 = gc.textExtent(s2, DRAW_FLAGS).x;
|
|
|
815 if (l1+w+l2 > width) {
|
|
|
816 max = mid;
|
|
|
817 mid = validateOffset(layout, (max+min)/2);
|
|
|
818 } else if (l1+w+l2 < width) {
|
|
|
819 min = mid;
|
|
|
820 mid = validateOffset(layout, (max+min)/2);
|
|
|
821 } else {
|
|
|
822 min = max;
|
|
|
823 }
|
|
|
824 }
|
|
|
825 String result = mid is 0 ? t : t.substring(0, mid) ~ ELLIPSIS ~ t.substring(validateOffset(layout, l-mid), l);
|
|
|
826 layout.dispose();
|
|
|
827 return result;
|
|
|
828 }
|
|
|
829 int validateOffset(TextLayout layout, int offset) {
|
|
|
830 int nextOffset = layout.getNextOffset(offset, SWT.MOVEMENT_CLUSTER);
|
|
|
831 if (nextOffset !is offset) return layout.getPreviousOffset(nextOffset, SWT.MOVEMENT_CLUSTER);
|
|
|
832 return offset;
|
|
|
833 }
|
|
|
834 private String[] splitString(String text) {
|
|
|
835 String[] lines = new String[1];
|
|
|
836 int start = 0, pos;
|
|
|
837 do {
|
|
|
838 pos = tango.text.Util.locate( text, '\n', start);
|
|
|
839 if (pos is text.length ) {
|
|
|
840 lines[lines.length - 1] = text[start .. $ ];
|
|
|
841 } else {
|
|
|
842 bool crlf = (pos > 0) && (text[ pos - 1 ] is '\r');
|
|
|
843 lines[lines.length - 1] = text[ start .. pos - (crlf ? 1 : 0)];
|
|
|
844 start = pos + 1;
|
|
|
845 String[] newLines = new String[lines.length+1];
|
|
|
846 System.arraycopy(lines, 0, newLines, 0, lines.length);
|
|
|
847 lines = newLines;
|
|
|
848 }
|
|
|
849 } while (pos !is text.length);
|
|
|
850 return lines;
|
|
|
851 }
|
|
|
852 }
|
