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1 /*******************************************************************************
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2 * Copyright (c) 2005, 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 *******************************************************************************/
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11 module org.eclipse.jface.internal.databinding.provisional.swt.TableUpdater;
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85
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12 import org.eclipse.jface.internal.databinding.provisional.swt.SWTUtil;
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78
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13
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14 import java.lang.all;
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15
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16 import org.eclipse.core.databinding.observable.ChangeEvent;
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17 import org.eclipse.core.databinding.observable.IChangeListener;
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18 import org.eclipse.core.databinding.observable.IObservable;
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19 import org.eclipse.core.databinding.observable.ObservableTracker;
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20 import org.eclipse.core.databinding.observable.list.IListChangeListener;
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21 import org.eclipse.core.databinding.observable.list.IObservableList;
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22 import org.eclipse.core.databinding.observable.list.ListChangeEvent;
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23 import org.eclipse.core.databinding.observable.list.ListDiffEntry;
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24 import org.eclipse.core.runtime.Assert;
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25 import org.eclipse.swt.SWT;
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26 import org.eclipse.swt.events.DisposeEvent;
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27 import org.eclipse.swt.events.DisposeListener;
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28 import org.eclipse.swt.widgets.Event;
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29 import org.eclipse.swt.widgets.Listener;
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30 import org.eclipse.swt.widgets.Table;
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31 import org.eclipse.swt.widgets.TableItem;
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32
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33 /**
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34 * NON-API - This class can be used to update a table with automatic dependency
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35 * tracking.
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36 *
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37 * @since 1.1
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38 *
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39 * @noextend This class is not intended to be subclassed by clients. (We do
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40 * encourage experimentation for non-production code and are
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41 * interested in feedback though.)
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42 *
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43 */
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44 public abstract class TableUpdater {
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45
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46 private class UpdateRunnable : Runnable, IChangeListener,
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47 DisposeListener {
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48 private TableItem item;
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49
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50 private bool dirty = false;
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51
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85
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52 private IObservable[] dependencies;
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53
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54 private final Object element;
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55
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56 this(TableItem item, Object element) {
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57 this.item = item;
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58 this.element = element;
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59 item.addDisposeListener(this);
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60 }
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61
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62 // Runnable implementation. This method runs at most once per repaint
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63 // whenever the
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64 // value gets marked as dirty.
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65 public void run() {
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66 if (table !is null && !table.isDisposed() && item !is null
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67 && !item.isDisposed()) {
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68 if (table.isVisible()) {
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69 int tableHeight = table.getClientArea().height;
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70 int numVisibleItems = tableHeight / table.getItemHeight();
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71 int indexOfItem = table.indexOf(item);
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72 int topIndex = table.getTopIndex();
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73 if (indexOfItem >= topIndex
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74 && indexOfItem <= topIndex + numVisibleItems) {
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75 updateIfNecessary(indexOfItem);
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76 return;
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77 }
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78 }
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79 table.clear(table.indexOf(item));
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80 }
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81 }
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82
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83 private void updateIfNecessary(int indexOfItem) {
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84 if (dirty) {
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85 dependencies = ObservableTracker.runAndMonitor(dgRunnable( (int indexOfItem_) {
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86 updateItem(indexOfItem_, item, element);
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87 }, indexOfItem), this, null);
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88 dirty = false;
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89 }
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90 }
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91
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92 // IChangeListener implementation (listening to the ComputedValue)
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93 public void handleChange(ChangeEvent event) {
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94 // Whenever this updator becomes dirty, schedule the run() method
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95 makeDirty();
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96 }
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97
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98 protected final void makeDirty() {
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99 if (!dirty) {
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100 dirty = true;
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101 stopListening();
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102 SWTUtil.runOnce(table.getDisplay(), this);
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103 }
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104 }
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105
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106 private void stopListening() {
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107 // Stop listening for dependency changes
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108 for (int i = 0; i < dependencies.length; i++) {
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109 IObservable observable = dependencies[i];
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110
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111 observable.removeChangeListener(this);
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112 }
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113 }
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114
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115 // DisposeListener implementation
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116 public void widgetDisposed(DisposeEvent e) {
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117 stopListening();
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118 dependencies = null;
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119 item = null;
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120 }
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121 }
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122
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123 private class PrivateInterface : Listener, DisposeListener {
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124
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125 // Listener implementation
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126 public void handleEvent(Event e) {
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127 if (e.type is SWT.SetData) {
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128 UpdateRunnable runnable = cast(UpdateRunnable) e.item.getData();
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129 if (runnable is null) {
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130 runnable = new UpdateRunnable(cast(TableItem) e.item, list.get(e.index));
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131 e.item.setData(runnable);
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132 runnable.makeDirty();
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133 } else {
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134 runnable.updateIfNecessary(e.index);
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135 }
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136 }
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137 }
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138
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139 // DisposeListener implementation
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140 public void widgetDisposed(DisposeEvent e) {
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141 this.outer.dispose();
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142 }
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143
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144 }
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145
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146 private PrivateInterface privateInterface;
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147
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148 private Table table;
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149
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150 private IListChangeListener listChangeListener;
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151 class ListChangeListener : IListChangeListener {
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78
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152 public void handleListChange(ListChangeEvent event) {
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153 ListDiffEntry[] differences = event.diff.getDifferences();
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154 for (int i = 0; i < differences.length; i++) {
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155 ListDiffEntry entry = differences[i];
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156 if (entry.isAddition()) {
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157 TableItem item = new TableItem(table, SWT.NONE, entry
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158 .getPosition());
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159 UpdateRunnable updateRunnable = new UpdateRunnable(item, entry.getElement());
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160 item.setData(updateRunnable);
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161 updateRunnable.makeDirty();
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162 } else {
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163 table.getItem(entry.getPosition()).dispose();
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164 }
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165 }
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166 }
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167 };
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168
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169 private IObservableList list;
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170
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171 /**
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172 * Creates an updator for the given control.
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173 *
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174 * @param table
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175 * table to update
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176 * @param list
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177 * @since 1.2
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178 */
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179 public this(Table table, IObservableList list) {
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180 privateInterface = new PrivateInterface();
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181 listChangeListener = new ListChangeListener();
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182 this.table = table;
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183 this.list = list;
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184 Assert.isLegal((table.getStyle() & SWT.VIRTUAL) !is 0,
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185 "TableUpdater requires virtual table"); //$NON-NLS-1$
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186
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187 table.setItemCount(list.size());
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188 list.addListChangeListener(listChangeListener);
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189
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190 table.addDisposeListener(privateInterface);
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191 table.addListener(SWT.SetData, privateInterface);
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192 }
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193
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194 /**
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195 * This is called automatically when the control is disposed. It may also be
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196 * called explicitly to remove this updator from the control. Subclasses
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197 * will normally extend this method to detach any listeners they attached in
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198 * their constructor.
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199 */
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200 public void dispose() {
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201 table.removeDisposeListener(privateInterface);
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85
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202 table.removeListener(SWT.SetData, cast(Listener)privateInterface);
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203 list.removeListChangeListener(listChangeListener);
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204 table = null;
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205 list = null;
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206 }
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207
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208 /**
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209 * Updates the control. This method will be invoked once after the updator
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210 * is created, and once before any repaint during which the control is
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211 * visible and dirty.
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212 *
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213 * <p>
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214 * Subclasses should overload this method to provide any code that changes
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215 * the appearance of the widget.
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216 * </p>
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217 *
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218 * @param index
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219 * @param item
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220 * the item to update
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221 * @param element
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222 * @since 1.2
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223 */
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224 protected abstract void updateItem(int index, TableItem item, Object element);
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225
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226 }
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