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annotate dwtx/draw2d/AbstractLabeledBorder.d @ 98:95307ad235d9

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Added Draw2d code, still work in progress
author Frank Benoit <benoit@tionex.de>
date Sun, 03 Aug 2008 00:52:14 +0200
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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.AbstractLabeledBorder;
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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.graphics.Color;
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20 import dwt.graphics.Font;
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21 import dwtx.draw2d.geometry.Dimension;
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22 import dwtx.draw2d.geometry.Insets;
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23 import dwtx.draw2d.AbstractBorder;
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24 import dwtx.draw2d.LabeledBorder;
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25 import dwtx.draw2d.IFigure;
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26 import dwtx.draw2d.ColorConstants;
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27 import dwtx.draw2d.FigureUtilities;
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28
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29 /**
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30 * Provides support for a border with a label describing the contents of which it is
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31 * surrounding.
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32 */
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33 public abstract class AbstractLabeledBorder
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34 : AbstractBorder
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35 , LabeledBorder
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36 {
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37
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38 private Dimension textExtents;
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39 private String label;
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40 private Insets insets;
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41 private Color textColor;
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42 private Font font;
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43
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44 /**
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45 * Constructs a default AbstractLabeledBorder with the name of this class set as its
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46 * label.
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47 *
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48 * @since 2.0
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49 */
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50 public this() {
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51 textColor = ColorConstants.black;
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52 String className = this.classinfo.name;
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53 setLabel(className.substring(className.lastIndexOf('.') + 1, className.length));
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54 }
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55
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56 /**
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57 * Constructs a border with the label set to the String passed in as input.
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58 *
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59 * @param s Label to be set on the border
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60 * @since 2.0
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61 */
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62 public this(String s) {
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63 textColor = ColorConstants.black;
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64 setLabel(s);
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65 }
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66
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67 /**
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68 * Calculates insets based on the current font and other attributes. This value will be
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69 * cached until {@link #invalidate()} is called.
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70 * @param figure The figure to which the border is being applied
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71 * @return The Insets
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72 */
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73 protected abstract Insets calculateInsets(IFigure figure);
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74
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75 /**
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76 * Returns the font that this border will use. If no Font has been specified, the font
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77 * associated with the input Figure will be used.
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78 * @param f Figure used to get a default font
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79 * @return The font for this border
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80 */
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81 protected Font getFont(IFigure f) {
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82 if (font is null)
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83 return f.getFont();
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84 return font;
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85 }
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86
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87 /**
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88 * Returns the insets, or space associated for this border. Returns any previously set
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89 * value if present, else calculates it from the Figure provided in as input.
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90 * @param fig Figure used to calculate insets
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91 * @return The insets
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92 */
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93 public Insets getInsets(IFigure fig) {
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94 if (insets is null)
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95 insets = calculateInsets(fig);
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96 return insets;
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97 }
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98
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99 /**
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100 * @see dwtx.draw2d.LabeledBorder#getLabel()
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101 */
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102 public String getLabel() {
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103 return label;
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104 }
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105
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106 /**
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107 * @see dwtx.draw2d.Border#getPreferredSize(IFigure)
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108 */
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109 public Dimension getPreferredSize(IFigure fig) {
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110 return new Dimension(getTextExtents(fig));
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111 }
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112
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113 /**
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114 * Returns the text Color of this AbstractLabeledBorder's label.
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115 *
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116 * @return The text color
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117 * @since 2.0
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118 */
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119 public Color getTextColor() {
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120 return textColor;
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121 }
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122
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123 /**
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124 * Calculates and returns the size required by this border's label.
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125 *
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126 * @param f IFigure on which the calculations are to be made
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127 * @return Dimensions required by the text of this border's label
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128 * @since 2.0
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129 */
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130 protected Dimension getTextExtents(IFigure f) {
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131 if (textExtents is null)
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132 textExtents = FigureUtilities.getTextExtents(label, getFont(f));
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133 return textExtents;
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134 }
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135
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136 /**
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137 * Resets the internal values and state so that they can be recalculated. Called whenever
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138 * a state change has occurred that effects the insets or text extents of this border.
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139 */
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140 protected void invalidate() {
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141 insets = null;
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142 textExtents = null;
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143 }
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144
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145 /**
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146 * Sets the Font of this border to the input value, and invalidates the border forcing an
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147 * update of internal parameters of insets and text extents.
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148 * @param font The font
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149 */
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150 public void setFont(Font font) {
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151 this.font = font;
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152 invalidate();
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153 }
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154
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155 /**
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156 * @see dwtx.draw2d.LabeledBorder#setLabel(String)
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157 */
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158 public void setLabel(String s) {
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159 label = ((s is null) ? "" : s); //$NON-NLS-1$
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160 invalidate();
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161 }
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162
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163 /**
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164 * Sets the color for this border's text.
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165 *
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166 * @param color Color to be set for this border's text
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167 * @since 2.0
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168 */
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169 public void setTextColor(Color color) {
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170 textColor = color;
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171 }
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172
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173 }