net.sourceforge.phpeclipse/src/net/sourceforge/phpdt/internal/ui/preferences/JavaSourcePreviewerUpdater.java

   1 /*******************************************************************************
   2  * Copyright (c) 2000, 2004 IBM Corporation and others.
   3  * All rights reserved. This program and the accompanying materials
   4  * are made available under the terms of the Common Public License v1.0
   5  * which accompanies this distribution, and is available at
   6  * http://www.eclipse.org/legal/cpl-v10.html
   7  *
   8  * Contributors:
   9  *     IBM Corporation - initial API and implementation
  10  *******************************************************************************/
  11
  12 package net.sourceforge.phpdt.internal.ui.preferences;
  13
  14 import net.sourceforge.phpdt.ui.PreferenceConstants;
  15 import net.sourceforge.phpdt.ui.text.PHPSourceViewerConfiguration;
  16
  17 import org.eclipse.jface.preference.IPreferenceStore;
  18 import org.eclipse.jface.resource.JFaceResources;
  19 import org.eclipse.jface.text.source.SourceViewer;
  20 import org.eclipse.jface.util.Assert;
  21 import org.eclipse.jface.util.IPropertyChangeListener;
  22 import org.eclipse.jface.util.PropertyChangeEvent;
  23 import org.eclipse.swt.events.DisposeEvent;
  24 import org.eclipse.swt.events.DisposeListener;
  25 import org.eclipse.swt.graphics.Font;
  26
  27 /**
  28  * Handles Java editor font changes for Java source preview viewers.
  29  *
  30  * @since 3.0
  31  */
  32 class JavaSourcePreviewerUpdater {
  33
  34         /**
  35          * Creates a Java source preview updater for the given viewer, configuration
  36          * and preference store.
  37          *
  38          * @param viewer
  39          *            the viewer
  40          * @param configuration
  41          *            the configuration
  42          * @param preferenceStore
  43          *            the preference store
  44          */
  45         JavaSourcePreviewerUpdater(final SourceViewer viewer,
  46                         final PHPSourceViewerConfiguration configuration,
  47                         final IPreferenceStore preferenceStore) {
  48                 Assert.isNotNull(viewer);
  49                 Assert.isNotNull(configuration);
  50                 Assert.isNotNull(preferenceStore);
  51                 final IPropertyChangeListener fontChangeListener = new IPropertyChangeListener() {
  52                         /*
  53                          * @see org.eclipse.jface.util.IPropertyChangeListener#propertyChange(org.eclipse.jface.util.PropertyChangeEvent)
  54                          */
  55                         public void propertyChange(PropertyChangeEvent event) {
  56                                 if (event.getProperty().equals(
  57                                                 PreferenceConstants.EDITOR_TEXT_FONT)) {
  58                                         Font font = JFaceResources
  59                                                         .getFont(PreferenceConstants.EDITOR_TEXT_FONT);
  60                                         viewer.getTextWidget().setFont(font);
  61                                 }
  62                         }
  63                 };
  64                 final IPropertyChangeListener propertyChangeListener = new IPropertyChangeListener() {
  65                         /*
  66                          * @see org.eclipse.jface.util.IPropertyChangeListener#propertyChange(org.eclipse.jface.util.PropertyChangeEvent)
  67                          */
  68                         public void propertyChange(PropertyChangeEvent event) {
  69                                 if (configuration.affectsTextPresentation(event)) {
  70                                         configuration.handlePropertyChangeEvent(event);
  71                                         viewer.invalidateTextPresentation();
  72                                 }
  73                         }
  74                 };
  75                 viewer.getTextWidget().addDisposeListener(new DisposeListener() {
  76                         /*
  77                          * @see org.eclipse.swt.events.DisposeListener#widgetDisposed(org.eclipse.swt.events.DisposeEvent)
  78                          */
  79                         public void widgetDisposed(DisposeEvent e) {
  80                                 preferenceStore
  81                                                 .removePropertyChangeListener(propertyChangeListener);
  82                                 JFaceResources.getFontRegistry().removeListener(
  83                                                 fontChangeListener);
  84                         }
  85                 });
  86                 JFaceResources.getFontRegistry().addListener(fontChangeListener);
  87                 preferenceStore.addPropertyChangeListener(propertyChangeListener);
  88         }
  89 }