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annotate dwtx/draw2d/text/FlowFigure.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.text.FlowFigure;
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14
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15 import dwt.dwthelper.utils;
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16 import dwtx.dwtxhelper.Collection;
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17
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18 import dwtx.draw2d.Figure;
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19 import dwtx.draw2d.IFigure;
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20 import dwtx.draw2d.geometry.Rectangle;
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21 import dwtx.draw2d.text.BidiProcessor;
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22 import dwtx.draw2d.text.FlowFigureLayout;
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23 import dwtx.draw2d.text.BidiInfo;
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24 import dwtx.draw2d.text.FlowContext;
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25
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26 /**
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27 * The base implementation for text flow figures. A flow figure is used to render a
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28 * document in which elements are laid out horizontally within a "line" until that line is
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29 * filled. Layout continues on the next line.
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30 *
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31 * <p>WARNING: This class is not intended to be subclassed by clients. Future versions may
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32 * contain additional abstract methods.
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33 *
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34 * @author hudsonr
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35 * @since 2.1
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36 */
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37 public abstract class FlowFigure
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38 : Figure
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39 {
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40 alias Figure.add add;
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41
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42 /**
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43 * integer indicating whether selection should be displayed.
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44 */
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45 protected int selectionStart = -1;
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46
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47 /**
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48 * Constructs a new FlowFigure.
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49 */
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50 public this() {
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51 setLayoutManager(createDefaultFlowLayout());
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52 }
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53
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54 /**
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55 * If the child is a <code>FlowFigure</code>, its FlowContext is passed to it.
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56 * @see dwtx.draw2d.IFigure#add(IFigure, Object, int)
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57 */
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58 public void add(IFigure child, Object constraint, int index) {
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59 super.add(child, constraint, index);
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60 //If this layout manager is a FlowContext, then the child *must* be a FlowFigure
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61 if (null !is cast(FlowContext)getLayoutManager() )
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62 (cast(FlowFigure)child).setFlowContext(cast(FlowContext)getLayoutManager());
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63 revalidateBidi(this);
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64 }
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65
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66 /**
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67 * Calculates the width of text before the next line-break is encountered.
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68 * <p>
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69 * Default implementation treats each FlowFigure as a line-break. It adds no width and
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70 * returns <code>true</code>. Sub-classes should override as needed.
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71 *
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72 * @param width the width before the next line-break (if one's found; all the width,
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73 * otherwise) will be added on to the first int in the given array
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74 * @return bool indicating whether or not a line-break was found
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75 * @since 3.1
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76 */
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77 public bool addLeadingWordRequirements(int[] width) {
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78 return true;
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79 }
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80
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81 /**
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82 * FlowFigures can contribute text for their block to the given {@link BidiProcessor},
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83 * which will process the contributions to determine Bidi levels and shaping requirements.
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84 * <p>
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85 * This method is invoked as part of validating Bidi.
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86 * <p>
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87 * Sub-classes that cache the BidiInfo and/or the bidi level in ContentBoxes should clear
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88 * the cached values when this method is invoked.
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89 *
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90 * @param proc the BidiProcessor to which contributions should be made
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91 * @see BidiProcessor#add(FlowFigure, String)
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92 * @since 3.1
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93 */
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94 protected void contributeBidi(BidiProcessor proc) {
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95 for (Iterator iter = getChildren().iterator(); iter.hasNext();)
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96 (cast(FlowFigure)iter.next()).contributeBidi(proc);
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97 }
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98
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99 /**
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100 * Creates the default layout manager
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101 * @return The default layout
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102 */
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103 protected abstract FlowFigureLayout createDefaultFlowLayout();
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104
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105 /**
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106 * Called after validate has occurred. This is used to update the bounds of the FlowFigure
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107 * to encompass its new flow boxed created during validate.
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108 */
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109 public abstract void postValidate();
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110
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111 /**
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112 * Overridden to revalidateBidi when fragments are removed.
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113 * @see dwtx.draw2d.IFigure#remove(dwtx.draw2d.IFigure)
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114 */
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115 public void remove(IFigure figure) {
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116 super.remove(figure);
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117 revalidateBidi(this);
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118 }
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119
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120 /**
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121 * This method should be invoked whenever a change that can potentially affect the
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122 * Bidi evaluation is made (eg., adding or removing children, changing text, etc.).
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123 * <p>
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124 * The default implementation delegates the revalidation task to the parent. Only
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125 * {@link BlockFlow#revalidateBidi(IFigure) blocks} perform the actual revalidation.
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126 * <p>
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127 * The given IFigure is the one that triggered the revalidation. This can be used to
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128 * optimize bidi evaluation.
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129 *
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130 * @param origin the figure that was revalidated
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131 * @since 3.1
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132 */
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133 protected void revalidateBidi(IFigure origin) {
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134 if (getParent() !is null)
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135 (cast(FlowFigure)getParent()).revalidateBidi(origin);
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136 }
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137
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138 /**
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139 * Sets the bidi information for this figure. A flow figure contributes bidi text in
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140 * {@link #contributeBidi(BidiProcessor)}. If the figure contributes text associated with
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141 * it, this method is called back to indicate the bidi properties for that text within its
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142 * block.
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143 *
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144 * @param info the BidiInfo for this figure
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145 * @since 3.1
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146 */
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147 public void setBidiInfo(BidiInfo info) { }
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148
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149 /**
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150 * FlowFigures override setBounds() to prevent translation of children. "bounds" is a
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151 * derived property for FlowFigures, calculated from the fragments that make up the
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152 * FlowFigure.
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153 * @see Figure#setBounds(Rectangle)
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154 */
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155 public void setBounds(Rectangle r) {
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156 if (bounds.opEquals(r))
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157 return;
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158 if (!r.contains(bounds))
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159 erase();
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160 bounds.x = r.x;
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161 bounds.y = r.y;
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162 bounds.width = r.width;
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163 bounds.height = r.height;
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164 fireFigureMoved();
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165 if (isCoordinateSystem())
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166 fireCoordinateSystemChanged();
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167 repaint();
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168 }
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169
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170 /**
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171 * Sets the flow context.
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172 * @param flowContext the flow context for this flow figure
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173 */
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174 public void setFlowContext(FlowContext flowContext) {
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175 (cast(FlowFigureLayout)getLayoutManager()).setFlowContext(flowContext);
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176 }
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177
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178 /**
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179 * Sets the selection or a range of selection. A start value of -1 is used to indicate no
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180 * selection. A start value >=0 indicates show selection. A start and end value can be
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181 * used to represent a range of offsets which should render selection.
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182 * @param start the start offset
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183 * @param end the end offset
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184 * @since 3.1
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185 */
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186 public void setSelection(int start, int end) {
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187 if (selectionStart is start)
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188 return;
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189 selectionStart = start;
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190 repaint();
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191 }
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192
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193 }