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