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annotate org.eclipse.jface/src/org/eclipse/jface/viewers/deferred/DeferredContentProvider.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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1 /*******************************************************************************
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2 * Copyright (c) 2004, 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
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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.jface.viewers.deferred.DeferredContentProvider;
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15 import org.eclipse.jface.viewers.ILazyContentProvider;
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16 import org.eclipse.jface.viewers.deferred.AbstractVirtualTable;
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17 import org.eclipse.jface.viewers.deferred.BackgroundContentProvider;
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18 import org.eclipse.jface.viewers.deferred.IConcurrentModel;
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19
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20 import org.eclipse.swt.graphics.Rectangle;
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21 import org.eclipse.swt.widgets.Control;
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22 import org.eclipse.swt.widgets.Table;
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23 import org.eclipse.core.runtime.Assert;
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24 import org.eclipse.jface.viewers.AcceptAllFilter;
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25 import org.eclipse.jface.viewers.IFilter;
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26 import org.eclipse.jface.viewers.ILazyContentProvider;
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27 import org.eclipse.jface.viewers.TableViewer;
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28 import org.eclipse.jface.viewers.Viewer;
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29
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30 import java.lang.all;
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31 import java.util.Set;
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32
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33 /**
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34 * Content provider that performs sorting and filtering in a background thread.
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35 * Requires a <code>TableViewer</code> created with the <code>SWT.VIRTUAL</code>
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36 * flag and an <code>IConcurrentModel</code> as input.
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37 * <p>
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38 * The sorter and filter must be set directly on the content provider.
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39 * Any sorter or filter on the TableViewer will be ignored.
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40 * </p>
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41 *
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42 * <p>
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43 * The real implementation is in <code>BackgroundContentProvider</code>. This
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44 * object is a lightweight wrapper that adapts the algorithm to work with
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45 * <code>TableViewer</code>.
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46 * </p>
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47 *
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48 * @since 3.1
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49 */
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50 public class DeferredContentProvider : ILazyContentProvider {
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51
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52 private int limit = -1;
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53 private BackgroundContentProvider provider;
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54 private Comparator sortOrder;
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55 private IFilter filter;
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56
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57 private AbstractVirtualTable table;
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58
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59 private static final class TableViewerAdapter : AbstractVirtualTable {
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60
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61 private TableViewer viewer;
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62
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63 /**
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64 * @param viewer
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65 */
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66 public this(TableViewer viewer) {
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67 this.viewer = viewer;
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68 }
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69
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70 /* (non-Javadoc)
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71 * @see org.eclipse.jface.viewers.deferred.AbstractVirtualTable#flushCache(java.lang.Object)
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72 */
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73 public override void clear(int index) {
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74 viewer.clear(index);
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75 }
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76
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77 /* (non-Javadoc)
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78 * @see org.eclipse.jface.viewers.deferred.AbstractVirtualTable#replace(java.lang.Object, int)
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79 */
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80 public override void replace(Object element, int itemIndex) {
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81 viewer.replace(element, itemIndex);
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82 }
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83
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84 /* (non-Javadoc)
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85 * @see org.eclipse.jface.viewers.deferred.AbstractVirtualTable#setItemCount(int)
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86 */
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87 public override void setItemCount(int total) {
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88 viewer.setItemCount(total);
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89 }
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90
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91 /* (non-Javadoc)
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92 * @see org.eclipse.jface.viewers.deferred.AbstractVirtualTable#getItemCount()
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93 */
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94 public override int getItemCount() {
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95 return viewer.getTable().getItemCount();
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96 }
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97
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98 /* (non-Javadoc)
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99 * @see org.eclipse.jface.viewers.deferred.AbstractVirtualTable#getTopIndex()
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100 */
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101 public override int getTopIndex() {
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102 return Math.max(viewer.getTable().getTopIndex() - 1, 0);
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103 }
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104
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105 /* (non-Javadoc)
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106 * @see org.eclipse.jface.viewers.deferred.AbstractVirtualTable#getVisibleItemCount()
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107 */
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108 public override int getVisibleItemCount() {
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109 Table table = viewer.getTable();
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110 Rectangle rect = table.getClientArea ();
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111 int itemHeight = table.getItemHeight ();
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112 int headerHeight = table.getHeaderHeight ();
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113 return (rect.height - headerHeight + itemHeight - 1) / (itemHeight + table.getGridLineWidth());
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114 }
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115
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116 /* (non-Javadoc)
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117 * @see org.eclipse.jface.viewers.deferred.AbstractVirtualTable#getControl()
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118 */
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119 public override Control getControl() {
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120 return viewer.getControl();
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121 }
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122
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123 }
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124
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125 /**
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126 * Create a DeferredContentProvider with the given sort order.
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127 * @param sortOrder a comparator that sorts the content.
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128 */
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129 public this(Comparator sortOrder) {
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130 this.filter = AcceptAllFilter.getInstance();
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131 this.sortOrder = sortOrder;
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132 }
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133
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134 /* (non-Javadoc)
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135 * @see org.eclipse.jface.viewers.IContentProvider#dispose()
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136 */
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137 public void dispose() {
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138 setProvider(null);
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139 }
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140
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141 /* (non-Javadoc)
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142 * @see org.eclipse.jface.viewers.IContentProvider#inputChanged(org.eclipse.jface.viewers.Viewer, java.lang.Object, java.lang.Object)
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143 */
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144 public void inputChanged(Viewer viewer, Object oldInput, Object newInput) {
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145 if (newInput is null) {
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146 setProvider(null);
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147 return;
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148 }
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149
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150 Assert.isTrue(null !is cast(IConcurrentModel)newInput );
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151 Assert.isTrue(null !is cast(TableViewer)viewer );
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152 IConcurrentModel model = cast(IConcurrentModel)newInput;
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153
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154 this.table = new TableViewerAdapter(cast(TableViewer)viewer);
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155
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156 BackgroundContentProvider newProvider = new BackgroundContentProvider(
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157 table,
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158 model, sortOrder);
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159
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160 setProvider(newProvider);
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161
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162 newProvider.setLimit(limit);
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163 newProvider.setFilter(filter);
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164 }
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165
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166 /**
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167 * Sets the sort order for this content provider. This sort order takes priority
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168 * over anything that was supplied to the <code>TableViewer</code>.
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169 *
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170 * @param sortOrder new sort order. The comparator must be able to support being
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171 * used in a background thread.
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172 */
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173 public void setSortOrder(Comparator sortOrder) {
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174 Assert.isNotNull(cast(Object)sortOrder);
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175 this.sortOrder = sortOrder;
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176 if (provider !is null) {
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177 provider.setSortOrder(sortOrder);
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178 }
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179 }
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180
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181 /**
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182 * Sets the filter for this content provider. This filter takes priority over
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183 * anything that was supplied to the <code>TableViewer</code>. The filter
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184 * must be capable of being used in a background thread.
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185 *
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186 * @param toSet filter to set
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187 */
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188 public void setFilter(IFilter toSet) {
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189 this.filter = toSet;
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190 if (provider !is null) {
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191 provider.setFilter(toSet);
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192 }
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193 }
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194
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195 /**
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196 * Sets the maximum number of rows in the table. If the model contains more
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197 * than this number of elements, only the top elements will be shown based on
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198 * the current sort order.
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199 *
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200 * @param limit maximum number of rows to show or -1 if unbounded
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201 */
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202 public void setLimit(int limit) {
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203 this.limit = limit;
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204 if (provider !is null) {
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205 provider.setLimit(limit);
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206 }
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207 }
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208
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209 /**
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210 * Returns the current maximum number of rows or -1 if unbounded
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211 *
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212 * @return the current maximum number of rows or -1 if unbounded
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213 */
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214 public int getLimit() {
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215 return limit;
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216 }
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217
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218 /* (non-Javadoc)
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219 * @see org.eclipse.jface.viewers.ILazyContentProvider#updateElement(int)
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220 */
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221 public void updateElement(int element) {
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222 if (provider !is null) {
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223 provider.checkVisibleRange(element);
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224 }
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225 }
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226
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227 private void setProvider(BackgroundContentProvider newProvider) {
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228 if (provider !is null) {
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229 provider.dispose();
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230 }
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231
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232 provider = newProvider;
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233 }
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234
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235 }