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annotate dwtx/draw2d/text/BlockFlowLayout.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.BlockFlowLayout;
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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 dwt.DWT;
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19 import dwtx.draw2d.Figure;
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20 import dwtx.draw2d.PositionConstants;
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21 import dwtx.draw2d.geometry.Insets;
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22 import dwtx.draw2d.text.FlowContainerLayout;
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23 import dwtx.draw2d.text.BlockBox;
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24 import dwtx.draw2d.text.BlockFlow;
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25 import dwtx.draw2d.text.CompositeBox;
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26 import dwtx.draw2d.text.FlowFigure;
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27 import dwtx.draw2d.text.LineRoot;
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28
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29 /**
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30 * The layout for {@link BlockFlow} figures.
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31 *
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32 * <P>WARNING: This class is not intended to be subclassed by clients.
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33 * @author hudsonr
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34 * @since 2.1
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35 */
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36 public class BlockFlowLayout
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37 : FlowContainerLayout
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38 {
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39
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40 BlockBox blockBox;
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41 bool blockInvalid = false;
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42 private bool continueOnSameLine = false;
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43 private CompositeBox previousLine = null;
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44
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45 /**
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46 * Creates a new BlockFlowLayout with the given BlockFlow.
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47 * @param blockFlow the BlockFlow
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48 */
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49 public this(BlockFlow blockFlow) {
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50 super(blockFlow);
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51 }
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52
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53 private void addBelowPreviousLine(CompositeBox line) {
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54 if (previousLine is null)
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55 line.setLineTop(line.getTopMargin());
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56 else
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57 line.setLineTop(previousLine.getBaseline() + previousLine.getDescent()
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58 + Math.max(previousLine.getBottomMargin(), line.getTopMargin()));
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59
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60 int alignment = getBlockFlow().getHorizontalAligment();
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61 if (alignment is PositionConstants.LEFT || alignment is PositionConstants.RIGHT) {
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62 int orientation = getBlockFlow().getOrientation();
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63 if (alignment is PositionConstants.LEFT)
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64 alignment = orientation is DWT.LEFT_TO_RIGHT
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65 ? PositionConstants.ALWAYS_LEFT : PositionConstants.ALWAYS_RIGHT;
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66 else
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67 alignment = orientation is DWT.LEFT_TO_RIGHT
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68 ? PositionConstants.ALWAYS_RIGHT : PositionConstants.ALWAYS_LEFT;
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69 }
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70 if (alignment !is PositionConstants.CENTER && getBlockFlow().isMirrored())
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71 alignment = (PositionConstants.ALWAYS_LEFT | PositionConstants.ALWAYS_RIGHT)
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72 & ~alignment;
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73
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74 switch (alignment) {
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75 case PositionConstants.ALWAYS_RIGHT:
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76 line.setX(blockBox.getRecommendedWidth() - line.getWidth());
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77 break;
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78 case PositionConstants.CENTER:
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79 line.setX((blockBox.getRecommendedWidth() - line.getWidth()) / 2);
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80 break;
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81 case PositionConstants.ALWAYS_LEFT:
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82 line.setX(0);
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83 break;
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84 default:
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85 throw new RuntimeException("Unexpected state"); //$NON-NLS-1$
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86 }
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87 blockBox.add(line);
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88 previousLine = line;
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89 }
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90
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91 /**
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92 * Align the line horizontally and then commit it.
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93 */
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94 protected void addCurrentLine() {
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95 addBelowPreviousLine(currentLine);
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96 (cast(LineRoot)currentLine).commit();
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97 }
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98
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99 /**
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100 * @see FlowContext#addLine(CompositeBox)
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101 */
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102 public void addLine(CompositeBox box) {
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103 endLine();
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104 addBelowPreviousLine(box);
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105 }
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106
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107 /**
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108 * Marks the blocks contents as changed. This means that children will be invalidated
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109 * during validation.
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110 * @since 3.1
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111 */
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112 public void blockContentsChanged() {
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113 blockInvalid = true;
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114 }
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115
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116 /**
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117 * @see FlowContainerLayout#cleanup()
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118 */
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119 protected void cleanup() {
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120 super.cleanup();
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121 previousLine = null;
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122 }
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123
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124 /**
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125 * @see FlowContainerLayout#createNewLine()
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126 */
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127 protected void createNewLine() {
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128 currentLine = new LineRoot(getBlockFlow().isMirrored());
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129 currentLine.setRecommendedWidth(blockBox.getRecommendedWidth());
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130 }
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131
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132 /**
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133 * Called by flush(), adds the BlockBox associated with this BlockFlowLayout
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134 * to the current line and then ends the line.
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135 */
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136 protected void endBlock() {
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137 if (blockInvalid) {
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138 Insets insets = getBlockFlow().getInsets();
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139 blockBox.height += insets.getHeight();
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140 blockBox.width += insets.getWidth();
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141 }
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142
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143 if (getContext() !is null)
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144 getContext().addLine(blockBox);
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145
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146 if (blockInvalid) {
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147 blockInvalid = false;
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148 List v = getFlowFigure().getChildren();
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149 for (int i = 0; i < v.size(); i++)
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150 (cast(FlowFigure)v.get(i)).postValidate();
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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 * @see FlowContext#endLine()
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156 */
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157 public void endLine() {
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158 if (currentLine is null || !currentLine.isOccupied())
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159 return;
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160 addCurrentLine();
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161 currentLine = null;
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162 }
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163
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164 /**
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165 * @see FlowContainerLayout#flush()
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166 */
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167 protected void flush() {
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168 endLine();
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169 endBlock();
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170 }
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171
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172 bool forceChildInvalidation(Figure f) {
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173 return blockInvalid;
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174 }
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175
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176 /**
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177 * Returns the BlockFlow associated with this BlockFlowLayout
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178 * @return the BlockFlow
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179 */
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180 protected final BlockFlow getBlockFlow() {
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181 return cast(BlockFlow)getFlowFigure();
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182 }
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183
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184 int getContextWidth() {
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185 return getContext().getRemainingLineWidth();
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186 }
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187
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188 /**
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189 * @see FlowContext#getContinueOnSameLine()
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190 */
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191 public bool getContinueOnSameLine() {
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192 return continueOnSameLine;
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193 }
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194
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195 /**
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196 * @see FlowContext#getWidthLookahead(FlowFigure, int[])
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197 */
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198 public void getWidthLookahead(FlowFigure child, int result[]) {
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199 List children = getFlowFigure().getChildren();
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200 int index = -1;
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201 if (child !is null)
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202 index = children.indexOf(child);
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203
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204 for (int i = index + 1; i < children.size(); i++)
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205 if ((cast(FlowFigure)children.get(i)).addLeadingWordRequirements(result))
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206 return;
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207 }
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208
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209 /**
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210 * @see FlowContainerLayout#preLayout()
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211 */
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212 protected void preLayout() {
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213 setContinueOnSameLine(false);
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214 blockBox = getBlockFlow().getBlockBox_package();
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215 setupBlock();
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216 //Probably could setup current and previous line here, or just previous
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217 }
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218
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219 /**
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220 * @see dwtx.draw2d.text.FlowContext#setContinueOnSameLine(bool)
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221 */
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222 public void setContinueOnSameLine(bool value) {
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223 continueOnSameLine = value;
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224 }
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225
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226 /**
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227 * sets up the single block that contains all of the lines.
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228 */
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229 protected void setupBlock() {
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230 int recommended = getContextWidth();
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231 if (recommended is Integer.MAX_VALUE)
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232 recommended = -1;
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233 BlockFlow bf = getBlockFlow();
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234 if (recommended > 0) {
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235 int borderCorrection = bf.getInsets().getWidth() + bf.getLeftMargin()
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236 + bf.getRightMargin();
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237 recommended = Math.max(0, recommended - borderCorrection);
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238 }
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239
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240 if (recommended !is blockBox.recommendedWidth) {
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241 blockInvalid = true;
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242 blockBox.setRecommendedWidth(recommended);
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243 }
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244
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245 if (blockInvalid) {
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246 blockBox.height = 0;
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247 blockBox.setWidth(Math.max(0, recommended));
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248 }
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249 }
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250
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251 }