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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.BlockFlow;
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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.ColorConstants;
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19 import org.eclipse.draw2d.Graphics;
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20 import org.eclipse.draw2d.IFigure;
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21 import org.eclipse.draw2d.PositionConstants;
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22 import org.eclipse.draw2d.geometry.Insets;
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23 import org.eclipse.draw2d.geometry.Rectangle;
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24 import org.eclipse.draw2d.text.FlowFigure;
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25 import org.eclipse.draw2d.text.BlockBox;
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26 import org.eclipse.draw2d.text.BidiProcessor;
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27 import org.eclipse.draw2d.text.FlowFigureLayout;
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28 import org.eclipse.draw2d.text.BidiChars;
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29 import org.eclipse.draw2d.text.BlockFlowLayout;
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30 import org.eclipse.draw2d.text.FlowBorder;
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31
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32 /**
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33 * A <code>FlowFigure</code> represented by a single {@link BlockBox} containing one or
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34 * more lines. A BlockFlow is a creator of LineBoxes, which its children require during
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35 * layout. A BlockFlow can be thought of as a foundation for a paragraph.
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36 * <P>
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37 * BlockFlows must be parented by a <code>FlowFigure</code>. {@link FlowPage} can be
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38 * used as a "root" block and can be parented by normal Figures.
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39 * <P>
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40 * Only {@link FlowFigure}s can be added to a BlockFlow.
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41 * <P>
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42 * WARNING: This class is not intended to be subclassed by clients.
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43 * @author hudsonr
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44 * @since 2.1
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45 */
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46 public class BlockFlow
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47 : FlowFigure
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48 {
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49
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50 private const BlockBox blockBox;
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51 private int alignment = PositionConstants.NONE;
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52 private int orientation = SWT.NONE;
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53 private bool bidiValid;
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54
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55 /**
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56 * Constructs a new BlockFlow.
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57 */
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58 public this() {
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59 blockBox = createBlockBox();
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60 }
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61
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62 /**
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63 * BlockFlows contribute a paragraph separator so as to keep the Bidi state of the text
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64 * on either side of this block from affecting each other. Since each block is like a
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65 * different paragraph, it does not contribute any actual text to its containing block.
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66 *
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67 * @see org.eclipse.draw2d.text.FlowFigure#contributeBidi(org.eclipse.draw2d.text.BidiProcessor)
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68 */
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69 protected void contributeBidi(BidiProcessor proc) {
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70 proc.addControlChar(BidiChars.P_SEP);
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71 }
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72
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73 BlockBox createBlockBox() {
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74 return new BlockBox(this);
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75 }
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76
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77 /**
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78 * @see org.eclipse.draw2d.text.FlowFigure#createDefaultFlowLayout()
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79 */
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80 protected FlowFigureLayout createDefaultFlowLayout() {
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81 return new BlockFlowLayout(this);
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82 }
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83
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84 /**
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85 * Returns the BlockBox associated with this.
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86 * @return This BlockFlow's BlockBox
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87 */
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88 protected BlockBox getBlockBox() {
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89 return blockBox;
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90 }
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91 package BlockBox getBlockBox_package() {
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92 return getBlockBox();
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93 }
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94
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95 int getBottomMargin() {
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96 int margin = 0;
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97 if (auto border = cast(FlowBorder)getBorder() ) {
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98 return border.getBottomMargin();
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99 }
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100 List children = getChildren();
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101 int childIndex = children.size() - 1;
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102 if (childIndex >= 0 && null !is cast(BlockFlow)children.get(childIndex) ) {
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103 margin = Math.max(margin,
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104 (cast(BlockFlow)children.get(childIndex)).getBottomMargin());
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105 }
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106 return margin;
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107 }
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108
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109 /**
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110 * Returns the effective horizontal alignment. This method will never return {@link
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111 * PositionConstants#NONE}. If the value is none, it will return the inherited alignment.
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112 * If no alignment was inherited, it will return the default alignment ({@link
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113 * PositionConstants#LEFT}).
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114 * @return the effective alignment
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115 */
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116 public int getHorizontalAligment() {
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117 if (alignment !is PositionConstants.NONE)
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118 return alignment;
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119 IFigure parent = getParent();
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120 while (parent !is null && !( null !is cast(BlockFlow)parent ))
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121 parent = parent.getParent();
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122 if (parent !is null)
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123 return (cast(BlockFlow)parent).getHorizontalAligment();
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124 return PositionConstants.LEFT;
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125 }
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126
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127 int getLeftMargin() {
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128 if ( auto b = cast(FlowBorder)getBorder() )
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129 return b.getLeftMargin();
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130 return 0;
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131 }
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132
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133 /**
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134 * Returns the orientation set on this block.
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135 * @return LTR, RTL or NONE
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136 * @see #setOrientation(int)
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137 * @since 3.1
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138 */
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139 public int getLocalOrientation() {
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140 return orientation;
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141 }
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142
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143 /**
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144 * Returns the horizontal alignment set on this block.
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145 * @return LEFT, RIGHT, ALWAYS_LEFT, ALWAYS_RIGHT, NONE
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146 * @see #setHorizontalAligment(int)
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147 * @since 3.1
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148 */
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149 public int getLocalHorizontalAlignment() {
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150 return alignment;
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151 }
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152
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153 /**
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154 * Returns this block's Bidi orientation. If none was set on this block, it
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155 * will inherit the one from its containing block. If there is no containing block, it
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156 * will return the default orientation (SWT.RIGHT_TO_LEFT if mirrored; SWT.LEFT_TO_RIGHT
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157 * otherwise).
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158 *
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159 * @return SWT.RIGHT_TO_LEFT or SWT.LEFT_TO_RIGHT
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160 * @see #setOrientation(int)
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161 * @since 3.1
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162 */
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163 public int getOrientation() {
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164 if (orientation !is SWT.NONE)
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165 return orientation;
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166 IFigure parent = getParent();
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167 while (parent !is null && !(null !is cast(BlockFlow)parent ))
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168 parent = parent.getParent();
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169 if (parent !is null)
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170 return (cast(BlockFlow)parent).getOrientation();
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171 return isMirrored() ? SWT.RIGHT_TO_LEFT : SWT.LEFT_TO_RIGHT;
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172 }
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173
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174 int getRightMargin() {
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175 if (auto b = cast(FlowBorder)getBorder() )
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176 return b.getRightMargin();
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177 return 0;
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178 }
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179
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180 int getTopMargin() {
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181 int margin = 0;
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182 if (auto border = cast(FlowBorder)getBorder() ) {
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183 return border.getTopMargin();
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184 }
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185 List children = getChildren();
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186 if (children.size() > 0 && null !is cast(BlockFlow)children.get(0) ) {
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187 margin = Math.max(margin,
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188 (cast(BlockFlow)children.get(0)).getTopMargin());
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189 }
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190 return margin;
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191 }
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192
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193 /**
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194 * @see org.eclipse.draw2d.Figure#paintBorder(org.eclipse.draw2d.Graphics)
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195 */
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196 public void paintBorder(Graphics graphics) {
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197 if ( auto b = cast(FlowBorder)getBorder() ) {
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198 Rectangle where = getBlockBox().toRectangle();
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199 where.crop(new Insets(getTopMargin(), getLeftMargin(),
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200 getBottomMargin(), getRightMargin()));
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201 (cast(FlowBorder)getBorder()).paint(this, graphics, where, SWT.LEAD | SWT.TRAIL);
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202 } else
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203 super.paintBorder(graphics);
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204 if (selectionStart !is -1) {
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205 graphics.restoreState();
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206 graphics.setXORMode(true);
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207 graphics.setBackgroundColor(ColorConstants.white);
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208 graphics.fillRectangle(getBounds());
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209 }
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210 }
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211
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212 /**
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213 * @see org.eclipse.draw2d.text.FlowFigure#postValidate()
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214 */
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215 public void postValidate() {
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216 Rectangle newBounds = getBlockBox().toRectangle();
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217 newBounds.crop(new Insets(getTopMargin(), getLeftMargin(),
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218 getBottomMargin(), getRightMargin()));
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219 setBounds(newBounds);
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220 }
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221
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222 /**
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223 * @see FlowFigure#revalidate()
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224 */
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225 public void revalidate() {
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226 BlockFlowLayout layout = cast(BlockFlowLayout)getLayoutManager();
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227 layout.blockContentsChanged();
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228 super.revalidate();
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229 }
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230
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231 /**
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232 * A Block will invalidate the Bidi state of all its children, so that it is
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233 * re-evaluated when this block is next validated.
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234 * @see org.eclipse.draw2d.text.FlowFigure#revalidateBidi(org.eclipse.draw2d.IFigure)
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235 */
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236 protected void revalidateBidi(IFigure origin) {
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237 if (bidiValid) {
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238 bidiValid = false;
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239 revalidate();
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240 }
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241 }
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242
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243 /**
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244 * Sets the horitontal aligment of the block. Valid values are:
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245 * <UL>
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246 * <LI>{@link PositionConstants#NONE NONE} - (default) Alignment is inherited from
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247 * parent. If a parent is not found then LEFT is used.</LI>
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248 * <LI>{@link PositionConstants#LEFT} - Alignment is with leading edge</LI>
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249 * <LI>{@link PositionConstants#RIGHT} - Alignment is with trailing edge</LI>
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250 * <LI>{@link PositionConstants#CENTER}</LI>
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251 * <LI>{@link PositionConstants#ALWAYS_LEFT} - Left, irrespective of orientation</LI>
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252 * <LI>{@link PositionConstants#ALWAYS_RIGHT} - Right, irrespective of orientation</LI>
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253 * </UL>
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254 * @param value the aligment
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255 * @see #getHorizontalAligment()
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256 */
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257 public void setHorizontalAligment(int value) {
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258 value &= PositionConstants.LEFT | PositionConstants.CENTER | PositionConstants.RIGHT
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259 | PositionConstants.ALWAYS_LEFT | PositionConstants.ALWAYS_RIGHT;
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260 if (value is alignment)
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261 return;
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262 alignment = value;
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263 revalidate();
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264 }
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265
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266 /**
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267 * Sets the orientation for this block. Orientation can be one of:
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268 * <UL>
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269 * <LI>{@link SWT#LEFT_TO_RIGHT}
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270 * <LI>{@link SWT#RIGHT_TO_LEFT}
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271 * <LI>{@link SWT#NONE} (default)
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272 * </UL>
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273 * <code>NONE</code> is used to indicate that orientation should be inherited from the
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274 * encompassing block.
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275 *
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276 * @param orientation LTR, RTL or NONE
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277 * @see #getOrientation()
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278 * @since 3.1
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279 */
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280 public void setOrientation(int orientation) {
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281 orientation &= SWT.LEFT_TO_RIGHT | SWT.RIGHT_TO_LEFT;
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282 if (this.orientation is orientation)
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283 return;
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284 this.orientation = orientation;
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285 revalidateBidi(this);
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286 }
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287
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288 /**
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289 * @see org.eclipse.draw2d.Figure#useLocalCoordinates()
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290 */
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291 protected bool useLocalCoordinates() {
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292 return true;
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293 }
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294
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295 /**
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296 * Re-evaluate the Bidi state of all the fragments if it has been
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297 * invalidated.
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298 * @see org.eclipse.draw2d.IFigure#validate()
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299 */
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300 public void validate() {
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301 if (!bidiValid) {
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302 BidiProcessor.INSTANCE.setOrientation(getOrientation());
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303 if (getOrientation() is SWT.LEFT_TO_RIGHT && isMirrored())
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304 BidiProcessor.INSTANCE.addControlChar(BidiChars.LRE);
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305 super.contributeBidi(BidiProcessor.INSTANCE);
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306 BidiProcessor.INSTANCE.process();
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307 bidiValid = true;
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308 }
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309 super.validate();
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310 }
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311
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312 }