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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 module dwtx.jface.text.contentassist.AdditionalInfoController;
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14
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15 import dwt.dwthelper.utils;
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16
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17
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18
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19
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20 import dwt.events.SelectionEvent;
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21 import dwt.events.SelectionListener;
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22 import dwt.graphics.Point;
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23 import dwt.graphics.Rectangle;
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24 import dwt.widgets.Control;
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25 import dwt.widgets.Display;
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26 import dwt.widgets.Shell;
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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.core.runtime.IProgressMonitor;
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31 import dwtx.core.runtime.IStatus;
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32 import dwtx.core.runtime.Status;
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33 import dwtx.core.runtime.jobs.Job;
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34 import dwtx.jface.internal.text.InformationControlReplacer;
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35 import dwtx.jface.text.AbstractInformationControlManager;
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36 import dwtx.jface.text.AbstractReusableInformationControlCreator;
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37 import dwtx.jface.text.DefaultInformationControl;
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38 import dwtx.jface.text.IInformationControl;
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39 import dwtx.jface.text.IInformationControlCreator;
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40 import dwtx.jface.text.IInformationControlExtension3;
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41
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42
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43 /**
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44 * Displays the additional information available for a completion proposal.
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45 *
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46 * @since 2.0
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47 */
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48 class AdditionalInfoController : AbstractInformationControlManager {
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49
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50 /**
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51 * A timer thread.
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52 *
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53 * @since 3.2
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54 */
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55 private static abstract class Timer {
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56 private static final int DELAY_UNTIL_JOB_IS_SCHEDULED= 50;
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57
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58 /**
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59 * A <code>Task</code> is {@link Task#run() run} when {@link #delay()} milliseconds have
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60 * elapsed after it was scheduled without a {@link #reset(ICompletionProposal) reset}
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61 * to occur.
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62 */
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63 private abstract class Task : Runnable {
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64 /**
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65 * @return the delay in milliseconds before this task should be run
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66 */
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67 public abstract long delay();
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68 /**
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69 * Runs this task.
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70 */
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71 public abstract void run();
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72 /**
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73 * @return the task to be scheduled after this task has been run
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74 */
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75 public abstract Task nextTask();
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76 }
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77
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78 /**
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79 * IDLE: the initial task, and active whenever the info has been shown. It cannot be run,
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80 * but specifies an infinite delay.
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81 */
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82 private final Task IDLE= new Task() {
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83 public void run() {
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84 Assert.isTrue(false);
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85 }
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86
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87 public Task nextTask() {
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88 Assert.isTrue(false);
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89 return null;
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90 }
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91
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92 public long delay() {
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93 return Long.MAX_VALUE;
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94 }
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95
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96 public String toString() {
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97 return "IDLE"; //$NON-NLS-1$
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98 }
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99 };
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100 /**
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101 * FIRST_WAIT: Schedules a platform {@link Job} to fetch additional info from an {@link ICompletionProposalExtension5}.
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102 */
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103 private final Task FIRST_WAIT= new Task() {
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104 public void run() {
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105 final ICompletionProposalExtension5 proposal= getCurrentProposalEx();
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106 Job job= new Job(JFaceTextMessages.getString("AdditionalInfoController.job_name")) { //$NON-NLS-1$
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107 protected IStatus run(IProgressMonitor monitor) {
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108 Object info;
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109 try {
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110 info= proposal.getAdditionalProposalInfo(monitor);
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111 } catch (RuntimeException x) {
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112 /*
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113 * XXX: This is the safest fix at this point so close to end of 3.2.
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114 * Will be revisited when fixing https://bugs.eclipse.org/bugs/show_bug.cgi?id=101033
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115 */
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116 return new Status(IStatus.WARNING, "dwtx.jface.text", IStatus.OK, "", x); //$NON-NLS-1$ //$NON-NLS-2$
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117 }
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118 setInfo((ICompletionProposal) proposal, info);
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119 return new Status(IStatus.OK, "dwtx.jface.text", IStatus.OK, "", null); //$NON-NLS-1$ //$NON-NLS-2$
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120 }
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121 };
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122 job.schedule();
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123 }
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124
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125 public Task nextTask() {
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126 return SECOND_WAIT;
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127 }
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128
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129 public long delay() {
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130 return DELAY_UNTIL_JOB_IS_SCHEDULED;
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131 }
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132
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133 public String toString() {
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134 return "FIRST_WAIT"; //$NON-NLS-1$
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135 }
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136 };
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137 /**
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138 * SECOND_WAIT: Allows display of additional info obtained from an
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139 * {@link ICompletionProposalExtension5}.
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140 */
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141 private final Task SECOND_WAIT= new Task() {
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142 public void run() {
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143 // show the info
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144 allowShowing();
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145 }
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146
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147 public Task nextTask() {
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148 return IDLE;
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149 }
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150
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151 public long delay() {
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152 return fDelay - DELAY_UNTIL_JOB_IS_SCHEDULED;
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153 }
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154
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155 public String toString() {
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156 return "SECOND_WAIT"; //$NON-NLS-1$
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157 }
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158 };
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159 /**
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160 * LEGACY_WAIT: Posts a runnable into the display thread to fetch additional info from non-{@link ICompletionProposalExtension5}s.
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161 */
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162 private final Task LEGACY_WAIT= new Task() {
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163 public void run() {
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164 final ICompletionProposal proposal= getCurrentProposal();
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165 if (!fDisplay.isDisposed()) {
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166 fDisplay.asyncExec(new Runnable() {
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167 public void run() {
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168 synchronized (Timer.this) {
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169 if (proposal is getCurrentProposal()) {
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170 Object info= proposal.getAdditionalProposalInfo();
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171 showInformation(proposal, info);
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172 }
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173 }
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174 }
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175 });
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176 }
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177 }
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178
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179 public Task nextTask() {
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180 return IDLE;
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181 }
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182
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183 public long delay() {
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184 return fDelay;
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185 }
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186
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187 public String toString() {
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188 return "LEGACY_WAIT"; //$NON-NLS-1$
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189 }
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190 };
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191 /**
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192 * EXIT: The task that triggers termination of the timer thread.
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193 */
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194 private final Task EXIT= new Task() {
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195 public long delay() {
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196 return 1;
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197 }
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198
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199 public Task nextTask() {
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200 Assert.isTrue(false);
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201 return EXIT;
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202 }
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203
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204 public void run() {
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205 Assert.isTrue(false);
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206 }
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207
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208 public String toString() {
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209 return "EXIT"; //$NON-NLS-1$
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210 }
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211 };
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212
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213 /** The timer thread. */
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214 private final Thread fThread;
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215
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216 /** The currently waiting / active task. */
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217 private Task fTask;
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218 /** The next wake up time. */
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219 private long fNextWakeup;
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220
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221 private ICompletionProposal fCurrentProposal= null;
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222 private Object fCurrentInfo= null;
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223 private bool fAllowShowing= false;
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224
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225 private final Display fDisplay;
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226 private final int fDelay;
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227
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228 /**
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229 * Creates a new timer.
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230 *
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231 * @param display the display to use for display thread posting.
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232 * @param delay the delay until to show additional info
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233 */
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234 public Timer(Display display, int delay) {
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235 fDisplay= display;
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236 fDelay= delay;
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237 long current= System.currentTimeMillis();
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238 schedule(IDLE, current);
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239
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240 fThread= new Thread(new Runnable() {
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241 public void run() {
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242 try {
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243 loop();
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244 } catch (InterruptedException x) {
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245 }
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246 }
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247 }, JFaceTextMessages.getString("InfoPopup.info_delay_timer_name")); //$NON-NLS-1$
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248 fThread.start();
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249 }
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250
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251 /**
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252 * Terminates the timer thread.
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253 */
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254 public synchronized final void terminate() {
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255 schedule(EXIT, System.currentTimeMillis());
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256 notifyAll();
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257 }
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258
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259 /**
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260 * Resets the timer thread as the selection has changed to a new proposal.
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261 *
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262 * @param p the new proposal
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263 */
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264 public final synchronized void reset(ICompletionProposal p) {
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265 if (fCurrentProposal !is p) {
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266 fCurrentProposal= p;
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267 fCurrentInfo= null;
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268 fAllowShowing= false;
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269
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270 long oldWakeup= fNextWakeup;
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271 Task task= taskOnReset(p);
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272 schedule(task, System.currentTimeMillis());
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273 if (fNextWakeup < oldWakeup)
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274 notifyAll();
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275 }
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276 }
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277
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278 private Task taskOnReset(ICompletionProposal p) {
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279 if (p is null)
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280 return IDLE;
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281 if (isExt5(p))
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282 return FIRST_WAIT;
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283 return LEGACY_WAIT;
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284 }
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285
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286 private synchronized void loop() throws InterruptedException {
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287 long current= System.currentTimeMillis();
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288 Task task= currentTask();
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289
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290 while (task !is EXIT) {
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291 long delay= fNextWakeup - current;
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292 if (delay <= 0) {
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293 task.run();
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294 task= task.nextTask();
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295 schedule(task, current);
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296 } else {
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297 wait(delay);
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298 current= System.currentTimeMillis();
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299 task= currentTask();
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300 }
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301 }
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302 }
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303
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304 private Task currentTask() {
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305 return fTask;
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306 }
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307
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308 private void schedule(Task task, long current) {
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309 fTask= task;
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310 long nextWakeup= current + task.delay();
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311 if (nextWakeup <= current)
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312 fNextWakeup= Long.MAX_VALUE;
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313 else
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314 fNextWakeup= nextWakeup;
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315 }
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316
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317 private bool isExt5(ICompletionProposal p) {
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318 return p instanceof ICompletionProposalExtension5;
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319 }
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320
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321 ICompletionProposal getCurrentProposal() {
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322 return fCurrentProposal;
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323 }
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324
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325 ICompletionProposalExtension5 getCurrentProposalEx() {
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326 Assert.isTrue(fCurrentProposal instanceof ICompletionProposalExtension5);
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327 return (ICompletionProposalExtension5) fCurrentProposal;
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328 }
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329
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330 synchronized void setInfo(ICompletionProposal proposal, Object info) {
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331 if (proposal is fCurrentProposal) {
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332 fCurrentInfo= info;
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333 if (fAllowShowing) {
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334 triggerShowing();
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335 }
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336 }
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337 }
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338
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339 private void triggerShowing() {
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340 final Object info= fCurrentInfo;
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341 if (!fDisplay.isDisposed()) {
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342 fDisplay.asyncExec(new Runnable() {
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343 public void run() {
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344 synchronized (Timer.this) {
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345 if (info is fCurrentInfo) {
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346 showInformation(fCurrentProposal, info);
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347 }
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348 }
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349 }
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350 });
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351 }
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352 }
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353
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354 /**
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355 * Called in the display thread to show additional info.
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356 *
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357 * @param proposal the proposal to show information about
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358 * @param info the information about <code>proposal</code>
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359 */
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360 protected abstract void showInformation(ICompletionProposal proposal, Object info);
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361
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362 void allowShowing() {
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363 fAllowShowing= true;
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364 triggerShowing();
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365 }
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366 }
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367 /**
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368 * Internal table selection listener.
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369 */
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370 private class TableSelectionListener : SelectionListener {
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371
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372 /*
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373 * @see SelectionListener#widgetSelected(SelectionEvent)
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374 */
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375 public void widgetSelected(SelectionEvent e) {
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376 handleTableSelectionChanged();
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377 }
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378
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379 /*
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380 * @see SelectionListener#widgetDefaultSelected(SelectionEvent)
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381 */
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382 public void widgetDefaultSelected(SelectionEvent e) {
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383 }
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384 }
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385
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386 /**
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387 * Default control creator for the information control replacer.
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388 * @since 3.4
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389 */
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390 private static class DefaultPresenterControlCreator : AbstractReusableInformationControlCreator {
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391 public IInformationControl doCreateInformationControl(Shell shell) {
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392 return new DefaultInformationControl(shell, true);
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393 }
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394 }
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395
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396 /** The proposal table. */
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397 private Table fProposalTable;
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398 /** The table selection listener */
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399 private SelectionListener fSelectionListener= new TableSelectionListener();
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400 /** The delay after which additional information is displayed */
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401 private final int fDelay;
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402 /**
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403 * The timer thread.
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404 * @since 3.2
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405 */
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406 private Timer fTimer;
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407 /**
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408 * The proposal most recently set by {@link #showInformation(ICompletionProposal, Object)},
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409 * possibly <code>null</code>.
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410 * @since 3.2
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411 */
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412 private ICompletionProposal fProposal;
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413 /**
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414 * The information most recently set by {@link #showInformation(ICompletionProposal, Object)},
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415 * possibly <code>null</code>.
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416 * @since 3.2
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417 */
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418 private Object fInformation;
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419
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420 /**
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421 * Creates a new additional information controller.
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422 *
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423 * @param creator the information control creator to be used by this controller
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424 * @param delay time in milliseconds after which additional info should be displayed
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425 */
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426 AdditionalInfoController(IInformationControlCreator creator, int delay) {
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427 super(creator);
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428 fDelay= delay;
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429 setAnchor(ANCHOR_RIGHT);
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430 setFallbackAnchors(new Anchor[] { ANCHOR_RIGHT, ANCHOR_LEFT, ANCHOR_BOTTOM });
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431
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432 /*
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433 * Adjust the location by one pixel towards the proposal popup, so that the single pixel
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434 * border of the additional info popup overlays with the border of the popup. This avoids
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435 * having a double black line.
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436 */
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437 int spacing= -1;
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438 setMargins(spacing, spacing); // see also adjustment in #computeLocation
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439
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440 InformationControlReplacer replacer= new InformationControlReplacer(new DefaultPresenterControlCreator());
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441 getInternalAccessor().setInformationControlReplacer(replacer);
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442 }
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443
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444 /*
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445 * @see AbstractInformationControlManager#install(Control)
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446 */
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447 public void install(Control control) {
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448
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449 if (fProposalTable is control) {
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450 // already installed
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451 return;
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452 }
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453
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454 super.install(control.getShell());
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455
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456 Assert.isTrue(control instanceof Table);
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457 fProposalTable= (Table) control;
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458 fProposalTable.addSelectionListener(fSelectionListener);
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459 getInternalAccessor().getInformationControlReplacer().install(fProposalTable);
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460
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461 fTimer= new Timer(fProposalTable.getDisplay(), fDelay) {
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462 protected void showInformation(ICompletionProposal proposal, Object info) {
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463 InformationControlReplacer replacer= getInternalAccessor().getInformationControlReplacer();
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464 if (replacer !is null)
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465 replacer.hideInformationControl();
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466 AdditionalInfoController.this.showInformation(proposal, info);
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467 }
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468 };
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469 }
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470
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471 /*
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472 * @see AbstractInformationControlManager#disposeInformationControl()
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473 */
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474 public void disposeInformationControl() {
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475
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476 if (fTimer !is null) {
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477 fTimer.terminate();
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478 fTimer= null;
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479 }
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480
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481 fProposal= null;
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482 fInformation= null;
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483
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484 if (fProposalTable !is null && !fProposalTable.isDisposed()) {
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485 fProposalTable.removeSelectionListener(fSelectionListener);
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486 fProposalTable= null;
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487 }
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488
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489 super.disposeInformationControl();
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490 }
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491
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492 /**
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493 *Handles a change of the line selected in the associated selector.
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494 */
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495 public void handleTableSelectionChanged() {
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496
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497 if (fProposalTable !is null && !fProposalTable.isDisposed() && fProposalTable.isVisible()) {
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498 TableItem[] selection= fProposalTable.getSelection();
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499 if (selection !is null && selection.length > 0) {
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|
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500
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|
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501 TableItem item= selection[0];
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|
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502
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|
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503 Object d= item.getData();
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504 if (d instanceof ICompletionProposal) {
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505 ICompletionProposal p= (ICompletionProposal) d;
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|
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506 fTimer.reset(p);
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|
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507 }
|
|
|
508 }
|
|
|
509 }
|
|
|
510 }
|
|
|
511
|
|
|
512 void showInformation(ICompletionProposal proposal, Object info) {
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|
|
513 if (fProposalTable is null || fProposalTable.isDisposed())
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|
|
514 return;
|
|
|
515
|
|
|
516 if (fProposal is proposal && ((info is null && fInformation is null) || (info !is null && info.equals(fInformation))))
|
|
|
517 return;
|
|
|
518
|
|
|
519 fInformation= info;
|
|
|
520 fProposal= proposal;
|
|
|
521 showInformation();
|
|
|
522 }
|
|
|
523
|
|
|
524 /*
|
|
|
525 * @see AbstractInformationControlManager#computeInformation()
|
|
|
526 */
|
|
|
527 protected void computeInformation() {
|
|
|
528 if (fProposal instanceof ICompletionProposalExtension3)
|
|
|
529 setCustomInformationControlCreator(((ICompletionProposalExtension3) fProposal).getInformationControlCreator());
|
|
|
530 else
|
|
|
531 setCustomInformationControlCreator(null);
|
|
|
532
|
|
|
533 // compute subject area
|
|
|
534 Point size= fProposalTable.getShell().getSize();
|
|
|
535
|
|
|
536 // set information & subject area
|
|
|
537 setInformation(fInformation, new Rectangle(0, 0, size.x, size.y));
|
|
|
538 }
|
|
|
539
|
|
|
540 /*
|
|
|
541 * @see dwtx.jface.text.AbstractInformationControlManager#computeLocation(dwt.graphics.Rectangle, dwt.graphics.Point, dwtx.jface.text.AbstractInformationControlManager.Anchor)
|
|
|
542 */
|
|
|
543 protected Point computeLocation(Rectangle subjectArea, Point controlSize, Anchor anchor) {
|
|
|
544 Point location= super.computeLocation(subjectArea, controlSize, anchor);
|
|
|
545
|
|
|
546 /*
|
|
|
547 * The location is computed using subjectControl.toDisplay(), which does not include the
|
|
|
548 * trim of the subject control. As we want the additional info popup aligned with the outer
|
|
|
549 * coordinates of the proposal popup, adjust this here
|
|
|
550 */
|
|
|
551 Rectangle trim= fProposalTable.getShell().computeTrim(0, 0, 0, 0);
|
|
|
552 location.x += trim.x;
|
|
|
553 location.y += trim.y;
|
|
|
554
|
|
|
555 return location;
|
|
|
556 }
|
|
|
557
|
|
|
558 /*
|
|
|
559 * @see dwtx.jface.text.AbstractInformationControlManager#computeSizeConstraints(Control, IInformationControl)
|
|
|
560 */
|
|
|
561 protected Point computeSizeConstraints(Control subjectControl, IInformationControl informationControl) {
|
|
|
562 // at least as big as the proposal table
|
|
|
563 Point sizeConstraint= super.computeSizeConstraints(subjectControl, informationControl);
|
|
|
564 Point size= subjectControl.getShell().getSize();
|
|
|
565
|
|
|
566 // AbstractInformationControlManager#internalShowInformationControl(Rectangle, Object) adds trims
|
|
|
567 // to the computed constraints. Need to remove them here, to make the outer bounds of the additional
|
|
|
568 // info shell fit the bounds of the proposal shell:
|
|
|
569 if (fInformationControl instanceof IInformationControlExtension3) {
|
|
|
570 Rectangle shellTrim= ((IInformationControlExtension3) fInformationControl).computeTrim();
|
|
|
571 size.x -= shellTrim.width;
|
|
|
572 size.y -= shellTrim.height;
|
|
|
573 }
|
|
|
574
|
|
|
575 if (sizeConstraint.x < size.x)
|
|
|
576 sizeConstraint.x= size.x;
|
|
|
577 if (sizeConstraint.y < size.y)
|
|
|
578 sizeConstraint.y= size.y;
|
|
|
579 return sizeConstraint;
|
|
|
580 }
|
|
|
581
|
|
|
582 /*
|
|
|
583 * @see dwtx.jface.text.AbstractInformationControlManager#hideInformationControl()
|
|
|
584 */
|
|
|
585 protected void hideInformationControl() {
|
|
|
586 super.hideInformationControl();
|
|
|
587 }
|
|
|
588
|
|
|
589 /**
|
|
|
590 * @return the current information control, or <code>null</code> if none available
|
|
|
591 */
|
|
|
592 public IInformationControl getCurrentInformationControl2() {
|
|
|
593 return getInternalAccessor().getCurrentInformationControl();
|
|
|
594 }
|
|
|
595 }
|
|
|
596
|
|
|
597
|
