Java tutorial
/******************************************************************************* * Copyright (c) 2000, 2005 IBM Corporation and others. * All rights reserved. This program and the accompanying materials * are made available under the terms of the Eclipse Public License v1.0 * which accompanies this distribution, and is available at * http://www.eclipse.org/legal/epl-v10.html * * Contributors: * IBM Corporation - initial API and implementation *******************************************************************************/ package org.eclipse.ant.internal.ui.preferences; import org.eclipse.ant.internal.ui.AntSourceViewerConfiguration; import org.eclipse.ant.internal.ui.editor.formatter.FormattingPreferences; import org.eclipse.ant.internal.ui.editor.formatter.XmlFormatter; import org.eclipse.jface.preference.IPreferenceStore; import org.eclipse.jface.preference.PreferenceConverter; import org.eclipse.jface.resource.JFaceResources; import org.eclipse.jface.text.source.ISourceViewer; import org.eclipse.jface.text.source.SourceViewer; import org.eclipse.jface.util.IPropertyChangeListener; import org.eclipse.jface.util.PropertyChangeEvent; import org.eclipse.swt.custom.StyledText; import org.eclipse.swt.events.DisposeEvent; import org.eclipse.swt.events.DisposeListener; import org.eclipse.swt.graphics.Color; import org.eclipse.swt.graphics.Font; import org.eclipse.swt.graphics.RGB; import org.eclipse.swt.widgets.Display; import org.eclipse.ui.texteditor.AbstractTextEditor; /** * Handles changes for Ant preview viewers. * * @since 3.0 */ class AntPreviewerUpdater { private Color fForegroundColor = null; private Color fBackgroundColor = null; private Color fSelectionBackgroundColor = null; private Color fSelectionForegroundColor = null; /** * Creates a source preview updater for the given viewer, configuration and preference store. * * @param viewer * the viewer * @param configuration * the configuration * @param preferenceStore * the preference store */ public AntPreviewerUpdater(final SourceViewer viewer, final AntSourceViewerConfiguration configuration, final IPreferenceStore preferenceStore) { initializeViewerColors(viewer, preferenceStore); final IPropertyChangeListener fontChangeListener = new IPropertyChangeListener() { /* * @see org.eclipse.jface.util.IPropertyChangeListener#propertyChange(org.eclipse.jface.util.PropertyChangeEvent) */ @Override public void propertyChange(PropertyChangeEvent event) { if (event.getProperty().equals(JFaceResources.TEXT_FONT)) { Font font = JFaceResources.getFont(JFaceResources.TEXT_FONT); viewer.getTextWidget().setFont(font); } } }; final IPropertyChangeListener propertyChangeListener = new IPropertyChangeListener() { /* * @see org.eclipse.jface.util.IPropertyChangeListener#propertyChange(org.eclipse.jface.util.PropertyChangeEvent) */ @Override public void propertyChange(PropertyChangeEvent event) { String property = event.getProperty(); if (AbstractTextEditor.PREFERENCE_COLOR_FOREGROUND.equals(property) || AbstractTextEditor.PREFERENCE_COLOR_FOREGROUND_SYSTEM_DEFAULT.equals(property) || AbstractTextEditor.PREFERENCE_COLOR_BACKGROUND.equals(property) || AbstractTextEditor.PREFERENCE_COLOR_BACKGROUND_SYSTEM_DEFAULT.equals(property) || AbstractTextEditor.PREFERENCE_COLOR_SELECTION_FOREGROUND.equals(property) || AbstractTextEditor.PREFERENCE_COLOR_SELECTION_FOREGROUND_SYSTEM_DEFAULT.equals(property) || AbstractTextEditor.PREFERENCE_COLOR_SELECTION_BACKGROUND.equals(property) || AbstractTextEditor.PREFERENCE_COLOR_SELECTION_BACKGROUND_SYSTEM_DEFAULT .equals(property)) { initializeViewerColors(viewer, preferenceStore); } if (configuration.affectsTextPresentation(event)) { configuration.adaptToPreferenceChange(event); viewer.invalidateTextPresentation(); } if (FormattingPreferences.affectsFormatting(event)) { format(viewer, preferenceStore); } } /** * @param viewer * @param preferenceStore */ private void format(final SourceViewer sourceViewer, final IPreferenceStore store) { String contents = sourceViewer.getDocument().get(); FormattingPreferences prefs = new FormattingPreferences(); prefs.setPreferenceStore(store); contents = XmlFormatter.format(contents, prefs); viewer.getDocument().set(contents); } }; viewer.getTextWidget().addDisposeListener(new DisposeListener() { /* * @see org.eclipse.swt.events.DisposeListener#widgetDisposed(org.eclipse.swt.events.DisposeEvent) */ @Override public void widgetDisposed(DisposeEvent e) { preferenceStore.removePropertyChangeListener(propertyChangeListener); JFaceResources.getFontRegistry().removeListener(fontChangeListener); } }); JFaceResources.getFontRegistry().addListener(fontChangeListener); preferenceStore.addPropertyChangeListener(propertyChangeListener); } /** * Initializes the given viewer's colors. * * @param viewer * the viewer to be initialized * @since 2.0 */ protected void initializeViewerColors(ISourceViewer viewer, IPreferenceStore store) { StyledText styledText = viewer.getTextWidget(); // ----------- foreground color -------------------- Color color = store.getBoolean(AbstractTextEditor.PREFERENCE_COLOR_FOREGROUND_SYSTEM_DEFAULT) ? null : createColor(store, AbstractTextEditor.PREFERENCE_COLOR_FOREGROUND, styledText.getDisplay()); styledText.setForeground(color); if (fForegroundColor != null) { fForegroundColor.dispose(); } fForegroundColor = color; // ---------- background color ---------------------- color = store.getBoolean(AbstractTextEditor.PREFERENCE_COLOR_BACKGROUND_SYSTEM_DEFAULT) ? null : createColor(store, AbstractTextEditor.PREFERENCE_COLOR_BACKGROUND, styledText.getDisplay()); styledText.setBackground(color); if (fBackgroundColor != null) { fBackgroundColor.dispose(); } fBackgroundColor = color; // ----------- selection foreground color -------------------- color = store.getBoolean(AbstractTextEditor.PREFERENCE_COLOR_SELECTION_FOREGROUND_SYSTEM_DEFAULT) ? null : createColor(store, AbstractTextEditor.PREFERENCE_COLOR_SELECTION_FOREGROUND, styledText.getDisplay()); styledText.setSelectionForeground(color); if (fSelectionForegroundColor != null) { fSelectionForegroundColor.dispose(); } fSelectionForegroundColor = color; // ---------- selection background color ---------------------- color = store.getBoolean(AbstractTextEditor.PREFERENCE_COLOR_SELECTION_BACKGROUND_SYSTEM_DEFAULT) ? null : createColor(store, AbstractTextEditor.PREFERENCE_COLOR_SELECTION_BACKGROUND, styledText.getDisplay()); styledText.setSelectionBackground(color); if (fSelectionBackgroundColor != null) { fSelectionBackgroundColor.dispose(); } fSelectionBackgroundColor = color; } /** * Creates a color from the information stored in the given preference store. Returns <code>null</code> if there is no such information available. * * @param store * the store to read from * @param key * the key used for the lookup in the preference store * @param display * the display used create the color * @return the created color according to the specification in the preference store * @since 2.0 */ private Color createColor(IPreferenceStore store, String key, Display display) { RGB rgb = null; if (store.contains(key)) { if (store.isDefault(key)) rgb = PreferenceConverter.getDefaultColor(store, key); else rgb = PreferenceConverter.getColor(store, key); if (rgb != null) return new Color(display, rgb); } return null; } public void dispose() { if (fForegroundColor != null) { fForegroundColor.dispose(); fForegroundColor = null; } if (fBackgroundColor != null) { fBackgroundColor.dispose(); fBackgroundColor = null; } if (fSelectionForegroundColor != null) { fSelectionForegroundColor.dispose(); fSelectionForegroundColor = null; } if (fSelectionBackgroundColor != null) { fSelectionBackgroundColor.dispose(); fSelectionBackgroundColor = null; } } }