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annotate org.eclipse.draw2d/src/org/eclipse/draw2d/text/BlockFlowLayout.d @ 12:bc29606a740c

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Added dwt-addons in original directory structure of eclipse.org
author Frank Benoit <benoit@tionex.de>
date Sat, 14 Mar 2009 18:23:29 +0100
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children dbfb303e8fb0
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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 org.eclipse.draw2d.text.BlockFlowLayout;
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14
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15 import java.lang.all;
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16
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17 import org.eclipse.swt.SWT;
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18 import org.eclipse.draw2d.Figure;
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19 import org.eclipse.draw2d.PositionConstants;
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20 import org.eclipse.draw2d.geometry.Insets;
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21 import org.eclipse.draw2d.text.FlowContainerLayout;
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22 import org.eclipse.draw2d.text.BlockBox;
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23 import org.eclipse.draw2d.text.BlockFlow;
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24 import org.eclipse.draw2d.text.CompositeBox;
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25 import org.eclipse.draw2d.text.FlowFigure;
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26 import org.eclipse.draw2d.text.LineRoot;
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27
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28 /**
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29 * The layout for {@link BlockFlow} figures.
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30 *
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31 * <P>WARNING: This class is not intended to be subclassed by clients.
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32 * @author hudsonr
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33 * @since 2.1
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34 */
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35 public class BlockFlowLayout
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36 : FlowContainerLayout
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37 {
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38
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39 BlockBox blockBox;
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40 bool blockInvalid = false;
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41 private bool continueOnSameLine = false;
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42 private CompositeBox previousLine = null;
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43
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44 /**
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45 * Creates a new BlockFlowLayout with the given BlockFlow.
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46 * @param blockFlow the BlockFlow
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47 */
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48 public this(BlockFlow blockFlow) {
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49 super(blockFlow);
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50 }
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51
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52 private void addBelowPreviousLine(CompositeBox line) {
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53 if (previousLine is null)
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54 line.setLineTop(line.getTopMargin());
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55 else
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56 line.setLineTop(previousLine.getBaseline() + previousLine.getDescent()
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57 + Math.max(previousLine.getBottomMargin(), line.getTopMargin()));
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58
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59 int alignment = getBlockFlow().getHorizontalAligment();
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60 if (alignment is PositionConstants.LEFT || alignment is PositionConstants.RIGHT) {
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61 int orientation = getBlockFlow().getOrientation();
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62 if (alignment is PositionConstants.LEFT)
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63 alignment = orientation is SWT.LEFT_TO_RIGHT
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64 ? PositionConstants.ALWAYS_LEFT : PositionConstants.ALWAYS_RIGHT;
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65 else
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66 alignment = orientation is SWT.LEFT_TO_RIGHT
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67 ? PositionConstants.ALWAYS_RIGHT : PositionConstants.ALWAYS_LEFT;
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68 }
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69 if (alignment !is PositionConstants.CENTER && getBlockFlow().isMirrored())
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70 alignment = (PositionConstants.ALWAYS_LEFT | PositionConstants.ALWAYS_RIGHT)
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71 & ~alignment;
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72
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73 switch (alignment) {
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74 case PositionConstants.ALWAYS_RIGHT:
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75 line.setX(blockBox.getRecommendedWidth() - line.getWidth());
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76 break;
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77 case PositionConstants.CENTER:
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78 line.setX((blockBox.getRecommendedWidth() - line.getWidth()) / 2);
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79 break;
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80 case PositionConstants.ALWAYS_LEFT:
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81 line.setX(0);
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82 break;
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83 default:
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84 throw new RuntimeException("Unexpected state"); //$NON-NLS-1$
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85 }
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86 blockBox.add(line);
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87 previousLine = line;
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88 }
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89
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90 /**
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91 * Align the line horizontally and then commit it.
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92 */
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93 protected void addCurrentLine() {
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94 addBelowPreviousLine(currentLine);
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95 (cast(LineRoot)currentLine).commit();
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96 }
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97
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98 /**
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99 * @see FlowContext#addLine(CompositeBox)
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100 */
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101 public void addLine(CompositeBox box) {
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102 endLine();
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103 addBelowPreviousLine(box);
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104 }
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105
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106 /**
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107 * Marks the blocks contents as changed. This means that children will be invalidated
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108 * during validation.
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109 * @since 3.1
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110 */
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111 public void blockContentsChanged() {
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112 blockInvalid = true;
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113 }
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114
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115 /**
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116 * @see FlowContainerLayout#cleanup()
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117 */
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118 protected void cleanup() {
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119 super.cleanup();
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120 previousLine = null;
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121 }
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122
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123 /**
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124 * @see FlowContainerLayout#createNewLine()
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125 */
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126 protected void createNewLine() {
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127 currentLine = new LineRoot(getBlockFlow().isMirrored());
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128 currentLine.setRecommendedWidth(blockBox.getRecommendedWidth());
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129 }
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130
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131 /**
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132 * Called by flush(), adds the BlockBox associated with this BlockFlowLayout
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133 * to the current line and then ends the line.
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134 */
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135 protected void endBlock() {
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136 if (blockInvalid) {
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137 Insets insets = getBlockFlow().getInsets();
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138 blockBox.height += insets.getHeight();
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139 blockBox.width += insets.getWidth();
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140 }
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141
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142 if (getContext() !is null)
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143 getContext().addLine(blockBox);
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144
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145 if (blockInvalid) {
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146 blockInvalid = false;
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147 List v = getFlowFigure().getChildren();
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148 for (int i = 0; i < v.size(); i++)
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149 (cast(FlowFigure)v.get(i)).postValidate();
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150 }
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151 }
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152
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153 /**
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154 * @see FlowContext#endLine()
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155 */
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156 public void endLine() {
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157 if (currentLine is null || !currentLine.isOccupied())
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158 return;
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159 addCurrentLine();
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160 currentLine = null;
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161 }
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162
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163 /**
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164 * @see FlowContainerLayout#flush()
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165 */
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166 protected void flush() {
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167 endLine();
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168 endBlock();
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169 }
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170
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171 bool forceChildInvalidation(Figure f) {
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172 return blockInvalid;
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173 }
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174
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175 /**
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176 * Returns the BlockFlow associated with this BlockFlowLayout
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177 * @return the BlockFlow
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178 */
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179 protected final BlockFlow getBlockFlow() {
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180 return cast(BlockFlow)getFlowFigure();
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181 }
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182
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183 int getContextWidth() {
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184 return getContext().getRemainingLineWidth();
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185 }
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186
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187 /**
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188 * @see FlowContext#getContinueOnSameLine()
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189 */
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190 public bool getContinueOnSameLine() {
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191 return continueOnSameLine;
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192 }
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193
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194 /**
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195 * @see FlowContext#getWidthLookahead(FlowFigure, int[])
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196 */
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197 public void getWidthLookahead(FlowFigure child, int result[]) {
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198 List children = getFlowFigure().getChildren();
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199 int index = -1;
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200 if (child !is null)
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201 index = children.indexOf(child);
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202
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203 for (int i = index + 1; i < children.size(); i++)
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204 if ((cast(FlowFigure)children.get(i)).addLeadingWordRequirements(result))
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205 return;
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206 }
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207
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208 /**
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209 * @see FlowContainerLayout#preLayout()
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210 */
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211 protected void preLayout() {
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212 setContinueOnSameLine(false);
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213 blockBox = getBlockFlow().getBlockBox_package();
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214 setupBlock();
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215 //Probably could setup current and previous line here, or just previous
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216 }
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217
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218 /**
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219 * @see org.eclipse.draw2d.text.FlowContext#setContinueOnSameLine(bool)
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220 */
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221 public void setContinueOnSameLine(bool value) {
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222 continueOnSameLine = value;
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223 }
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224
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225 /**
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226 * sets up the single block that contains all of the lines.
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227 */
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228 protected void setupBlock() {
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229 int recommended = getContextWidth();
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230 if (recommended is Integer.MAX_VALUE)
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231 recommended = -1;
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232 BlockFlow bf = getBlockFlow();
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233 if (recommended > 0) {
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234 int borderCorrection = bf.getInsets().getWidth() + bf.getLeftMargin()
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235 + bf.getRightMargin();
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236 recommended = Math.max(0, recommended - borderCorrection);
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237 }
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238
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239 if (recommended !is blockBox.recommendedWidth) {
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240 blockInvalid = true;
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241 blockBox.setRecommendedWidth(recommended);
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242 }
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243
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244 if (blockInvalid) {
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245 blockBox.height = 0;
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246 blockBox.setWidth(Math.max(0, recommended));
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247 }
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248 }
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249
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250 }