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comparison dwtx/jface/internal/text/link/contentassist/AdditionalInfoController2.d @ 129:eb30df5ca28b

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Added JFace Text sources
author Frank Benoit <benoit@tionex.de>
date Sat, 23 Aug 2008 19:10:48 +0200
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128:8df1d4193877 129:eb30df5ca28b
1 /*******************************************************************************
2 * Copyright (c) 2000, 2008 IBM Corporation and others.
3 * All rights reserved. This program and the accompanying materials
4 * are made available under the terms of the Eclipse Public License v1.0
5 * which accompanies this distribution, and is available at
6 * http://www.eclipse.org/legal/epl-v10.html
7 *
8 * Contributors:
9 * IBM Corporation - initial API and implementation
10 * Port to the D programming language:
11 * Frank Benoit <benoit@tionex.de>
12 *******************************************************************************/
13
14 module dwtx.jface.internal.text.link.contentassist.AdditionalInfoController2;
15
16 import dwt.dwthelper.utils;
17
18
19
20
21
22 import dwt.events.SelectionEvent;
23 import dwt.events.SelectionListener;
24 import dwt.graphics.Point;
25 import dwt.graphics.Rectangle;
26 import dwt.widgets.Control;
27 import dwt.widgets.Table;
28 import dwt.widgets.TableItem;
29 import dwtx.core.runtime.Assert;
30 import dwtx.jface.text.AbstractInformationControlManager;
31 import dwtx.jface.text.IInformationControl;
32 import dwtx.jface.text.IInformationControlCreator;
33 import dwtx.jface.text.contentassist.ICompletionProposal;
34 import dwtx.jface.text.contentassist.ICompletionProposalExtension3;
35
36
37
38 /**
39 * Displays the additional information available for a completion proposal.
40 *
41 * @since 2.0
42 */
43 class AdditionalInfoController2 : AbstractInformationControlManager , Runnable {
44
45 /**
46 * Internal table selection listener.
47 */
48 private class TableSelectionListener : SelectionListener {
49
50 /*
51 * @see SelectionListener#widgetSelected(SelectionEvent)
52 */
53 public void widgetSelected(SelectionEvent e) {
54 handleTableSelectionChanged();
55 }
56
57 /*
58 * @see SelectionListener#widgetDefaultSelected(SelectionEvent)
59 */
60 public void widgetDefaultSelected(SelectionEvent e) {
61 }
62 }
63
64
65 /** The proposal table */
66 private Table fProposalTable;
67 /** The thread controlling the delayed display of the additional info */
68 private Thread fThread;
69 /** Indicates whether the display delay has been reset */
70 private bool fIsReset= false;
71 /** Object to synchronize display thread and table selection changes */
72 private final Object fMutex= new Object();
73 /** Thread access lock. */
74 private final Object fThreadAccess= new Object();
75 /** Object to synchronize initial display of additional info */
76 private Object fStartSignal;
77 /** The table selection listener */
78 private SelectionListener fSelectionListener= new TableSelectionListener();
79 /** The delay after which additional information is displayed */
80 private int fDelay;
81
82
83 /**
84 * Creates a new additional information controller.
85 *
86 * @param creator the information control creator to be used by this controller
87 * @param delay time in milliseconds after which additional info should be displayed
88 */
89 AdditionalInfoController2(IInformationControlCreator creator, int delay) {
90 super(creator);
91 fDelay= delay;
92 setAnchor(ANCHOR_RIGHT);
93 setFallbackAnchors(new Anchor[] {ANCHOR_RIGHT, ANCHOR_LEFT, ANCHOR_BOTTOM });
94 }
95
96 /*
97 * @see AbstractInformationControlManager#install(Control)
98 */
99 public void install(Control control) {
100
101 if (fProposalTable is control) {
102 // already installed
103 return;
104 }
105
106 super.install(control);
107
108 Assert.isTrue(control instanceof Table);
109 fProposalTable= (Table) control;
110 fProposalTable.addSelectionListener(fSelectionListener);
111 synchronized (fThreadAccess) {
112 if (fThread !is null)
113 fThread.interrupt();
114 fThread= new Thread(this, ContentAssistMessages.getString("InfoPopup.info_delay_timer_name")); //$NON-NLS-1$
115
116 fStartSignal= new Object();
117 synchronized (fStartSignal) {
118 fThread.start();
119 try {
120 // wait until thread is ready
121 fStartSignal.wait();
122 } catch (InterruptedException x) {
123 }
124 }
125 }
126 }
127
128 /*
129 * @see AbstractInformationControlManager#disposeInformationControl()
130 */
131 public void disposeInformationControl() {
132
133 synchronized (fThreadAccess) {
134 if (fThread !is null) {
135 fThread.interrupt();
136 fThread= null;
137 }
138 }
139
140 if (fProposalTable !is null && !fProposalTable.isDisposed()) {
141 fProposalTable.removeSelectionListener(fSelectionListener);
142 fProposalTable= null;
143 }
144
145 super.disposeInformationControl();
146 }
147
148 /*
149 * @see java.lang.Runnable#run()
150 */
151 public void run() {
152 try {
153 while (true) {
154
155 synchronized (fMutex) {
156
157 if (fStartSignal !is null) {
158 synchronized (fStartSignal) {
159 fStartSignal.notifyAll();
160 fStartSignal= null;
161 }
162 }
163
164 // Wait for a selection event to occur.
165 fMutex.wait();
166
167 while (true) {
168 fIsReset= false;
169 // Delay before showing the popup.
170 fMutex.wait(fDelay);
171 if (!fIsReset)
172 break;
173 }
174 }
175
176 if (fProposalTable !is null && !fProposalTable.isDisposed()) {
177 fProposalTable.getDisplay().asyncExec(new Runnable() {
178 public void run() {
179 if (!fIsReset)
180 showInformation();
181 }
182 });
183 }
184
185 }
186 } catch (InterruptedException e) {
187 }
188
189 synchronized (fThreadAccess) {
190 // only null fThread if it is us!
191 if (Thread.currentThread() is fThread)
192 fThread= null;
193 }
194 }
195
196 /**
197 *Handles a change of the line selected in the associated selector.
198 */
199 public void handleTableSelectionChanged() {
200
201 if (fProposalTable !is null && !fProposalTable.isDisposed() && fProposalTable.isVisible()) {
202 synchronized (fMutex) {
203 fIsReset= true;
204 fMutex.notifyAll();
205 }
206 }
207 }
208
209 /*
210 * @see AbstractInformationControlManager#computeInformation()
211 */
212 protected void computeInformation() {
213
214 if (fProposalTable is null || fProposalTable.isDisposed())
215 return;
216
217 TableItem[] selection= fProposalTable.getSelection();
218 if (selection !is null && selection.length > 0) {
219
220 TableItem item= selection[0];
221
222 // compute information
223 String information= null;
224 Object d= item.getData();
225
226 if (d instanceof ICompletionProposal) {
227 ICompletionProposal p= (ICompletionProposal) d;
228 information= p.getAdditionalProposalInfo();
229 }
230
231 if (d instanceof ICompletionProposalExtension3)
232 setCustomInformationControlCreator(((ICompletionProposalExtension3) d).getInformationControlCreator());
233 else
234 setCustomInformationControlCreator(null);
235
236 // compute subject area
237 setMargins(4, -1);
238 Rectangle area= fProposalTable.getBounds();
239 area.x= 0; // subject area is the whole subject control
240 area.y= 0;
241
242 // set information & subject area
243 setInformation(information, area);
244 }
245 }
246
247 /*
248 * @see dwtx.jface.text.AbstractInformationControlManager#computeSizeConstraints(Control, IInformationControl)
249 */
250 protected Point computeSizeConstraints(Control subjectControl, IInformationControl informationControl) {
251 // at least as big as the proposal table
252 Point sizeConstraint= super.computeSizeConstraints(subjectControl, informationControl);
253 Point size= subjectControl.getSize();
254 if (sizeConstraint.x < size.x)
255 sizeConstraint.x= size.x;
256 if (sizeConstraint.y < size.y)
257 sizeConstraint.y= size.y;
258 return sizeConstraint;
259 }
260 }
261
262