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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 | *******************************************************************************/ | |
11 | ||
12 | package org.eclipse.jdt.internal.ui.preferences; | |
13 | ||
14 | import org.eclipse.swt.events.DisposeEvent; | |
15 | import org.eclipse.swt.events.DisposeListener; | |
16 | import org.eclipse.swt.graphics.Font; | |
17 | ||
18 | import org.eclipse.core.runtime.Assert; | |
19 | ||
20 | import org.eclipse.jface.preference.IPreferenceStore; | |
21 | import org.eclipse.jface.resource.JFaceResources; | |
22 | import org.eclipse.jface.util.IPropertyChangeListener; | |
23 | import org.eclipse.jface.util.PropertyChangeEvent; | |
24 | ||
25 | import org.eclipse.jface.text.source.SourceViewer; | |
26 | ||
27 | import org.eclipse.jdt.ui.PreferenceConstants; | |
28 | import org.eclipse.jdt.ui.text.JavaSourceViewerConfiguration; | |
29 | ||
30 | /** | |
31 | * Handles Java editor font changes for Java source preview viewers. | |
32 | * | |
33 | * @since 3.0 | |
34 | */ | |
35 | public class JavaSourcePreviewerUpdater { | |
36 | ||
37 | /** | |
38 | * Creates a Java source preview updater for the given viewer, configuration and preference store. | |
39 | * | |
40 | * @param viewer the viewer | |
41 | * @param configuration the configuration | |
42 | * @param preferenceStore the preference store | |
43 | */ | |
44 | public JavaSourcePreviewerUpdater(final SourceViewer viewer, final JavaSourceViewerConfiguration configuration, final IPreferenceStore preferenceStore) { | |
45 | Assert.isNotNull(viewer); | |
46 | Assert.isNotNull(configuration); | |
47 | Assert.isNotNull(preferenceStore); | |
48 | final IPropertyChangeListener fontChangeListener= new IPropertyChangeListener() { | |
49 | /* | |
50 | * @see org.eclipse.jface.util.IPropertyChangeListener#propertyChange(org.eclipse.jface.util.PropertyChangeEvent) | |
51 | */ | |
52 | public void propertyChange(PropertyChangeEvent event) { | |
53 | if (event.getProperty().equals(PreferenceConstants.EDITOR_TEXT_FONT)) { | |
54 | Font font= JFaceResources.getFont(PreferenceConstants.EDITOR_TEXT_FONT); | |
55 | viewer.getTextWidget().setFont(font); | |
56 | } | |
57 | } | |
58 | }; | |
59 | final IPropertyChangeListener propertyChangeListener= new IPropertyChangeListener() { | |
60 | /* | |
61 | * @see org.eclipse.jface.util.IPropertyChangeListener#propertyChange(org.eclipse.jface.util.PropertyChangeEvent) | |
62 | */ | |
63 | public void propertyChange(PropertyChangeEvent event) { | |
64 | if (configuration.affectsTextPresentation(event)) { | |
65 | configuration.handlePropertyChangeEvent(event); | |
66 | viewer.invalidateTextPresentation(); | |
67 | } | |
68 | } | |
69 | }; | |
70 | viewer.getTextWidget().addDisposeListener(new DisposeListener() { | |
71 | /* | |
72 | * @see org.eclipse.swt.events.DisposeListener#widgetDisposed(org.eclipse.swt.events.DisposeEvent) | |
73 | */ | |
74 | public void widgetDisposed(DisposeEvent e) { | |
75 | preferenceStore.removePropertyChangeListener(propertyChangeListener); | |
76 | JFaceResources.getFontRegistry().removeListener(fontChangeListener); | |
77 | } | |
78 | }); | |
79 | JFaceResources.getFontRegistry().addListener(fontChangeListener); | |
80 | preferenceStore.addPropertyChangeListener(propertyChangeListener); | |
81 | } | |
82 | } |