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1 /*******************************************************************************
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2 * Copyright (c) 2000, 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
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14 module dwtx.jface.internal.text.link.contentassist.AdditionalInfoController2;
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15
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16 import dwt.dwthelper.utils;
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17
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18
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19
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20
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21
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22 import dwt.events.SelectionEvent;
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23 import dwt.events.SelectionListener;
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24 import dwt.graphics.Point;
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25 import dwt.graphics.Rectangle;
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26 import dwt.widgets.Control;
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27 import dwt.widgets.Table;
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28 import dwt.widgets.TableItem;
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29 import dwtx.core.runtime.Assert;
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30 import dwtx.jface.text.AbstractInformationControlManager;
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31 import dwtx.jface.text.IInformationControl;
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32 import dwtx.jface.text.IInformationControlCreator;
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33 import dwtx.jface.text.contentassist.ICompletionProposal;
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34 import dwtx.jface.text.contentassist.ICompletionProposalExtension3;
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35
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36
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37
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38 /**
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39 * Displays the additional information available for a completion proposal.
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40 *
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41 * @since 2.0
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42 */
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43 class AdditionalInfoController2 : AbstractInformationControlManager , Runnable {
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44
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45 /**
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46 * Internal table selection listener.
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47 */
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48 private class TableSelectionListener : SelectionListener {
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49
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50 /*
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51 * @see SelectionListener#widgetSelected(SelectionEvent)
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52 */
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53 public void widgetSelected(SelectionEvent e) {
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54 handleTableSelectionChanged();
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55 }
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56
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57 /*
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58 * @see SelectionListener#widgetDefaultSelected(SelectionEvent)
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59 */
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60 public void widgetDefaultSelected(SelectionEvent e) {
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61 }
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62 }
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63
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64
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65 /** The proposal table */
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66 private Table fProposalTable;
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67 /** The thread controlling the delayed display of the additional info */
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68 private Thread fThread;
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69 /** Indicates whether the display delay has been reset */
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70 private bool fIsReset= false;
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71 /** Object to synchronize display thread and table selection changes */
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72 private final Object fMutex= new Object();
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73 /** Thread access lock. */
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74 private final Object fThreadAccess= new Object();
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75 /** Object to synchronize initial display of additional info */
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76 private Object fStartSignal;
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77 /** The table selection listener */
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78 private SelectionListener fSelectionListener= new TableSelectionListener();
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79 /** The delay after which additional information is displayed */
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80 private int fDelay;
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81
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82
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83 /**
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84 * Creates a new additional information controller.
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85 *
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86 * @param creator the information control creator to be used by this controller
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87 * @param delay time in milliseconds after which additional info should be displayed
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88 */
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89 AdditionalInfoController2(IInformationControlCreator creator, int delay) {
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90 super(creator);
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91 fDelay= delay;
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92 setAnchor(ANCHOR_RIGHT);
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130
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93 setFallbackAnchors([ANCHOR_RIGHT, ANCHOR_LEFT, ANCHOR_BOTTOM ]);
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129
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94 }
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95
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96 /*
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97 * @see AbstractInformationControlManager#install(Control)
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98 */
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99 public void install(Control control) {
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100
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101 if (fProposalTable is control) {
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102 // already installed
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103 return;
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104 }
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105
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106 super.install(control);
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107
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108 Assert.isTrue(control instanceof Table);
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109 fProposalTable= (Table) control;
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110 fProposalTable.addSelectionListener(fSelectionListener);
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111 synchronized (fThreadAccess) {
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112 if (fThread !is null)
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113 fThread.interrupt();
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114 fThread= new Thread(this, ContentAssistMessages.getString("InfoPopup.info_delay_timer_name")); //$NON-NLS-1$
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115
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116 fStartSignal= new Object();
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117 synchronized (fStartSignal) {
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118 fThread.start();
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119 try {
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120 // wait until thread is ready
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121 fStartSignal.wait();
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122 } catch (InterruptedException x) {
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123 }
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124 }
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125 }
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126 }
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127
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128 /*
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129 * @see AbstractInformationControlManager#disposeInformationControl()
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130 */
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131 public void disposeInformationControl() {
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132
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133 synchronized (fThreadAccess) {
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134 if (fThread !is null) {
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135 fThread.interrupt();
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136 fThread= null;
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137 }
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138 }
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139
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140 if (fProposalTable !is null && !fProposalTable.isDisposed()) {
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141 fProposalTable.removeSelectionListener(fSelectionListener);
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142 fProposalTable= null;
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143 }
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144
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145 super.disposeInformationControl();
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146 }
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147
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148 /*
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149 * @see java.lang.Runnable#run()
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150 */
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151 public void run() {
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152 try {
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153 while (true) {
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154
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155 synchronized (fMutex) {
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156
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157 if (fStartSignal !is null) {
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158 synchronized (fStartSignal) {
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159 fStartSignal.notifyAll();
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160 fStartSignal= null;
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161 }
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162 }
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163
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164 // Wait for a selection event to occur.
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165 fMutex.wait();
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166
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167 while (true) {
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168 fIsReset= false;
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169 // Delay before showing the popup.
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170 fMutex.wait(fDelay);
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171 if (!fIsReset)
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172 break;
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173 }
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174 }
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175
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176 if (fProposalTable !is null && !fProposalTable.isDisposed()) {
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177 fProposalTable.getDisplay().asyncExec(new Runnable() {
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178 public void run() {
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179 if (!fIsReset)
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180 showInformation();
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181 }
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182 });
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183 }
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184
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185 }
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186 } catch (InterruptedException e) {
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187 }
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188
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189 synchronized (fThreadAccess) {
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190 // only null fThread if it is us!
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191 if (Thread.currentThread() is fThread)
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192 fThread= null;
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193 }
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194 }
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195
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196 /**
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197 *Handles a change of the line selected in the associated selector.
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198 */
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199 public void handleTableSelectionChanged() {
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200
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201 if (fProposalTable !is null && !fProposalTable.isDisposed() && fProposalTable.isVisible()) {
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202 synchronized (fMutex) {
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203 fIsReset= true;
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204 fMutex.notifyAll();
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205 }
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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 * @see AbstractInformationControlManager#computeInformation()
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211 */
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212 protected void computeInformation() {
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213
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214 if (fProposalTable is null || fProposalTable.isDisposed())
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215 return;
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216
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217 TableItem[] selection= fProposalTable.getSelection();
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218 if (selection !is null && selection.length > 0) {
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219
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220 TableItem item= selection[0];
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221
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222 // compute information
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223 String information= null;
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224 Object d= item.getData();
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225
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226 if (d instanceof ICompletionProposal) {
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227 ICompletionProposal p= (ICompletionProposal) d;
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228 information= p.getAdditionalProposalInfo();
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229 }
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230
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231 if (d instanceof ICompletionProposalExtension3)
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232 setCustomInformationControlCreator(((ICompletionProposalExtension3) d).getInformationControlCreator());
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233 else
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234 setCustomInformationControlCreator(null);
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235
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236 // compute subject area
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237 setMargins(4, -1);
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238 Rectangle area= fProposalTable.getBounds();
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239 area.x= 0; // subject area is the whole subject control
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240 area.y= 0;
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241
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242 // set information & subject area
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243 setInformation(information, area);
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244 }
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245 }
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246
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247 /*
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248 * @see dwtx.jface.text.AbstractInformationControlManager#computeSizeConstraints(Control, IInformationControl)
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249 */
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250 protected Point computeSizeConstraints(Control subjectControl, IInformationControl informationControl) {
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251 // at least as big as the proposal table
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252 Point sizeConstraint= super.computeSizeConstraints(subjectControl, informationControl);
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253 Point size= subjectControl.getSize();
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254 if (sizeConstraint.x < size.x)
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255 sizeConstraint.x= size.x;
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256 if (sizeConstraint.y < size.y)
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257 sizeConstraint.y= size.y;
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258 return sizeConstraint;
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259 }
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260 }
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261
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262
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