annotate dwtx/jface/layout/AbstractColumnLayout.d @ 70:46a6e0e6ccd4

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author Frank Benoit <benoit@tionex.de>
date Thu, 22 May 2008 01:36:46 +0200
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1 /*******************************************************************************
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2 * Copyright (c) 2006, 2008 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 (original file dwtx.ui.texteditor.templates.ColumnLayout)
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10 * Tom Schindl <tom.schindl@bestsolution.at> - refactored to be widget independent (bug 171824)
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11 * - fix for bug 178280, 184342, 184045, 208014, 214532
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12 * Micah Hainline <micah_hainline@yahoo.com> - fix in bug: 208335
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13 * Port to the D programming language:
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14 * Frank Benoit <benoit@tionex.de>
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15 *******************************************************************************/
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16 module dwtx.jface.layout.AbstractColumnLayout;
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17
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18
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19 import dwt.DWT;
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20 import dwt.graphics.Point;
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21 import dwt.graphics.Rectangle;
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22 import dwt.widgets.Composite;
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23 import dwt.widgets.Event;
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24 import dwt.widgets.Layout;
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25 import dwt.widgets.Listener;
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26 import dwt.widgets.Scrollable;
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27 import dwt.widgets.Widget;
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28 import dwtx.core.runtime.Assert;
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29 import dwtx.jface.util.Policy;
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30 import dwtx.jface.viewers.ColumnLayoutData;
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31 import dwtx.jface.viewers.ColumnPixelData;
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32 import dwtx.jface.viewers.ColumnWeightData;
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33 import dwtx.jface.viewers.TableLayout;
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34
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35 import dwt.dwthelper.utils;
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36
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37 /**
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38 * The AbstractColumnLayout is a {@link Layout} used to set the size of a table
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39 * in a consistent way even during a resize unlike a {@link TableLayout} which
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40 * only sets initial sizes.
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41 *
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42 * <p>
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43 * <b>You can only add the layout to a container whose only child is the
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44 * table/tree control you want the layouts applied to.</b>
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45 * </p>
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46 *
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47 * @since 3.4
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48 */
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49 public abstract class AbstractColumnLayout : Layout {
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50 private static int COLUMN_TRIM;
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51 static {
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52 if ("win32".equals(DWT.getPlatform())) { //$NON-NLS-1$
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53 COLUMN_TRIM = 4;
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54 } else if ("carbon".equals(DWT.getPlatform())) { //$NON-NLS-1$
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55 COLUMN_TRIM = 24;
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56 } else {
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57 COLUMN_TRIM = 3;
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58 }
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59 }
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60
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61 static const bool IS_GTK;
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62
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63 static const String LAYOUT_DATA;
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64
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65 static this(){
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66 COLUMN_TRIM = "carbon".equals(DWT.getPlatform()) ? 24 : 3; //$NON-NLS-1$
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67 IS_GTK = "gtk".equals(DWT.getPlatform());//$NON-NLS-1$
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68 LAYOUT_DATA = Policy.JFACE ~ ".LAYOUT_DATA"; //$NON-NLS-1$
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69 }
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71 private bool inupdateMode = false;
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72
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73 private bool relayout = true;
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74
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75 private Listener resizeListener;
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76 private void init_resizeListener(){
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77 resizeListener = new class Listener {
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78
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79 public void handleEvent(Event event) {
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80 if( ! inupdateMode ) {
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81 updateColumnData(event.widget);
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82 }
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83 }
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84
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85 };
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86 }
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87 public this(){
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88 init_resizeListener();
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89 }
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90
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91 /**
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92 * Adds a new column of data to this table layout.
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93 *
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94 * @param column
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95 * the column
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96 *
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97 * @param data
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98 * the column layout data
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99 */
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100 public void setColumnData(Widget column, ColumnLayoutData data) {
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101
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102 if (column.getData(LAYOUT_DATA) is null) {
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103 column.addListener(DWT.Resize, resizeListener);
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104 }
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105
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106 column.setData(LAYOUT_DATA, data);
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107 }
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108
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109 /**
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110 * Compute the size of the table or tree based on the ColumnLayoutData and
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111 * the width and height hint.
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112 *
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113 * @param scrollable
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114 * the widget to compute
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115 * @param wHint
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116 * the width hint
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117 * @param hHint
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118 * the height hint
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119 * @return Point where x is the width and y is the height
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120 */
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121 private Point computeTableTreeSize(Scrollable scrollable, int wHint,
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122 int hHint) {
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123 Point result = scrollable.computeSize(wHint, hHint);
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124
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125 int width = 0;
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126 int size = getColumnCount(scrollable);
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127 for (int i = 0; i < size; ++i) {
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128 ColumnLayoutData layoutData = getLayoutData(scrollable, i);
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129 if ( auto col = cast(ColumnPixelData)layoutData) {
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130 width += col.width;
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131 if (col.addTrim) {
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132 width += getColumnTrim();
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133 }
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134 } else if ( auto col = cast(ColumnWeightData)layoutData ) {
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135 width += col.minimumWidth;
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136 } else {
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137 Assert.isTrue(false, "Unknown column layout data"); //$NON-NLS-1$
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138 }
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139 }
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140 if (width > result.x)
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141 result.x = width;
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142
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143 return result;
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144 }
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145
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146 /**
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147 * Layout the scrollable based on the supplied width and area. Only increase
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148 * the size of the scrollable if increase is <code>true</code>.
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149 *
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150 * @param scrollable
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151 * @param width
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152 * @param area
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153 * @param increase
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154 */
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155 private void layoutTableTree(Scrollable scrollable, int width,
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156 Rectangle area, bool increase) {
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157 int numberOfColumns = getColumnCount(scrollable);
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158 int[] widths = new int[numberOfColumns];
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159
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160 int[] weightColumnIndices = new int[numberOfColumns];
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161 int numberOfWeightColumns = 0;
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162
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163 int fixedWidth = 0;
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164 int totalWeight = 0;
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165
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166 // First calc space occupied by fixed columns
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167 for (int i = 0; i < numberOfColumns; i++) {
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168 ColumnLayoutData col = getLayoutData(scrollable, i);
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169 if ( auto cpd = cast(ColumnPixelData)col ) {
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170 int pixels = cpd.width;
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171 if (cpd.addTrim) {
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172 pixels += getColumnTrim();
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173 }
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174 widths[i] = pixels;
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175 fixedWidth += pixels;
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176 } else if ( auto cw = cast(ColumnWeightData) col ) {
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177 weightColumnIndices[numberOfWeightColumns] = i;
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178 numberOfWeightColumns++;
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179 totalWeight += cw.weight;
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180 } else {
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181 Assert.isTrue(false, "Unknown column layout data"); //$NON-NLS-1$
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182 }
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183 }
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184
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185 bool recalculate;
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186 do {
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187 recalculate = false;
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188 for (int i = 0; i < numberOfWeightColumns; i++) {
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189 int colIndex = weightColumnIndices[i];
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190 ColumnWeightData cw = (ColumnWeightData) getLayoutData(
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191 scrollable, colIndex);
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192 final int minWidth = cw.minimumWidth;
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193 final int allowedWidth = (width - fixedWidth) * cw.weight
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194 / totalWeight;
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195 if (allowedWidth < minWidth) {
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196 /*
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197 * if the width assigned by weight is less than the minimum,
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198 * then treat this column as fixed, remove it from weight
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199 * calculations, and recalculate other weights.
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200 */
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201 numberOfWeightColumns--;
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202 totalWeight -= cw.weight;
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203 fixedWidth += minWidth;
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204 widths[colIndex] = minWidth;
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205 System.arraycopy(weightColumnIndices, i + 1,
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206 weightColumnIndices, i, numberOfWeightColumns - i);
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207 recalculate = true;
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208 break;
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209 }
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210 widths[colIndex] = allowedWidth;
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211 }
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212 } while (recalculate);
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213
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214 if (increase) {
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215 scrollable.setSize(area.width, area.height);
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216 }
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217
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218 inupdateMode = true;
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219 setColumnWidths(scrollable, widths);
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220 scrollable.update();
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221 inupdateMode = false;
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222
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223 if (!increase) {
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224 scrollable.setSize(area.width, area.height);
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225 }
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226 }
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227
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228 /*
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229 * (non-Javadoc)
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230 *
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231 * @see dwt.widgets.Layout#computeSize(dwt.widgets.Composite,
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232 * int, int, bool)
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233 */
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234 protected override Point computeSize(Composite composite, int wHint, int hHint,
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235 bool flushCache) {
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236 return computeTableTreeSize(getControl(composite), wHint, hHint);
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237 }
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238
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239 /*
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240 * (non-Javadoc)
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241 *
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242 * @see dwt.widgets.Layout#layout(dwt.widgets.Composite,
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243 * bool)
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244 */
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245 protected override void layout(Composite composite, bool flushCache) {
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246 Rectangle area = composite.getClientArea();
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247 Scrollable table = getControl(composite);
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248 int tableWidth = table.getSize().x;
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249 int trim = computeTrim(area, table, tableWidth);
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250 int width = Math.max(0, area.width - trim);
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251
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252 if (width > 1)
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253 layoutTableTree(table, width, area, tableWidth < area.width);
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254
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255 // For the first time we need to relayout because Scrollbars are not
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256 // calculate appropriately
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257 if (relayout) {
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258 relayout = false;
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259 composite.layout();
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260 }
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261 }
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262
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263 /**
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264 * Compute the area required for trim.
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265 *
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266 * @param area
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267 * @param scrollable
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268 * @param currentWidth
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269 * @return int
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270 */
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271 private int computeTrim(Rectangle area, Scrollable scrollable,
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272 int currentWidth) {
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273 int trim;
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274
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275 if (currentWidth > 1) {
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276 trim = currentWidth - scrollable.getClientArea().width;
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277 } else {
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278 // initially, the table has no extend and no client area - use the
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279 // border with
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280 // plus some padding as educated guess
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281 trim = 2 * scrollable.getBorderWidth() + 1;
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282 }
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283
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284 return trim;
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285 }
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286
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287 /**
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288 * Get the control being laid out.
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289 *
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290 * @param composite
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291 * the composite with the layout
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292 * @return {@link Scrollable}
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293 */
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294 Scrollable getControl(Composite composite) {
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295 return cast(Scrollable) composite.getChildren()[0];
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296 }
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297
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298 /**
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299 * Get the number of columns for the receiver.
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300 *
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301 * @return the number of columns
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302 */
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303 abstract int getColumnCount(Scrollable tableTree);
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304
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305 /**
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306 * Set the widths of the columns.
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307 *
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308 * @param widths
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309 */
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310 abstract void setColumnWidths(Scrollable tableTree, int[] widths);
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311
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312 abstract ColumnLayoutData getLayoutData(Scrollable tableTree,
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313 int columnIndex);
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314
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315 abstract void updateColumnData(Widget column);
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316
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317 /**
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318 * The number of extra pixels taken as horizontal trim by the table column.
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319 * To ensure there are N pixels available for the content of the column,
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320 * assign N+COLUMN_TRIM for the column width.
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321 *
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322 * @return the trim used by the columns
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323 * @since 3.4
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324 */
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325 protected int getColumnTrim() {
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326 return COLUMN_TRIM;
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327 }
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328 }