/*******************************************************************************
* Copyright (c) 2007, 2009 Wind River Systems, Inc. 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:
* Anton Leherbauer (Wind River Systems) - initial API and implementation
* Andrew Ferguson (Symbian)
*******************************************************************************/
package org.eclipse.cdt.internal.ui.compare;
import org.eclipse.compare.CompareConfiguration;
import org.eclipse.compare.contentmergeviewer.TextMergeViewer;
import org.eclipse.jface.preference.IPreferenceStore;
import org.eclipse.jface.preference.PreferenceConverter;
import org.eclipse.jface.text.TextViewer;
import org.eclipse.jface.text.source.SourceViewer;
import org.eclipse.jface.text.source.SourceViewerConfiguration;
import org.eclipse.jface.util.IPropertyChangeListener;
import org.eclipse.jface.util.PropertyChangeEvent;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.DisposeEvent;
import org.eclipse.swt.graphics.RGB;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.ui.texteditor.AbstractTextEditor;
import org.eclipse.cdt.ui.CUIPlugin;
import org.eclipse.cdt.ui.text.ICColorConstants;
import org.eclipse.cdt.ui.text.ICPartitions;
/**
* Abstract implementation of a merge viewer.
*/
abstract class AbstractMergeViewer extends TextMergeViewer {
private IPropertyChangeListener fPreferenceChangeListener;
private IPreferenceStore fPreferenceStore;
protected boolean fUseSystemColors;
/**
* Creates a color from the information stored in the given preference store.
* Returns <code>null</code> if there is no such information available.
*/
protected static RGB createColor(IPreferenceStore store, String key) {
if (!store.contains(key))
return null;
if (store.isDefault(key))
return PreferenceConverter.getDefaultColor(store, key);
return PreferenceConverter.getColor(store, key);
}
/**
* Create a new merge viewer.
*
* @param parent
* @param style
* @param configuration
*/
public AbstractMergeViewer(Composite parent, int style, CompareConfiguration configuration) {
super(parent, style | SWT.LEFT_TO_RIGHT, configuration);
IPreferenceStore store = getPreferenceStore();
fUseSystemColors= store.getBoolean(AbstractTextEditor.PREFERENCE_COLOR_BACKGROUND_SYSTEM_DEFAULT);
if (! fUseSystemColors) {
RGB bg= createColor(store, AbstractTextEditor.PREFERENCE_COLOR_BACKGROUND);
setBackgroundColor(bg);
RGB fg= createColor(store, ICColorConstants.C_DEFAULT);
setForegroundColor(fg);
}
}
protected IPreferenceStore getPreferenceStore() {
if (fPreferenceStore == null) {
fPreferenceStore= CUIPlugin.getDefault().getCombinedPreferenceStore();
fPreferenceChangeListener= new IPropertyChangeListener() {
public void propertyChange(PropertyChangeEvent event) {
handlePropertyChange(event);
}
};
fPreferenceStore.addPropertyChangeListener(fPreferenceChangeListener);
}
return fPreferenceStore;
}
@Override
protected void handleDispose(DisposeEvent event) {
if (fPreferenceChangeListener != null) {
fPreferenceStore.removePropertyChangeListener(fPreferenceChangeListener);
fPreferenceChangeListener= null;
}
super.handleDispose(event);
}
protected void handlePropertyChange(PropertyChangeEvent event) {
String key= event.getProperty();
if (key.equals(AbstractTextEditor.PREFERENCE_COLOR_BACKGROUND)) {
if (!fUseSystemColors) {
RGB bg= createColor(fPreferenceStore, AbstractTextEditor.PREFERENCE_COLOR_BACKGROUND);
setBackgroundColor(bg);
}
} else if (key.equals(AbstractTextEditor.PREFERENCE_COLOR_BACKGROUND_SYSTEM_DEFAULT)) {
fUseSystemColors= fPreferenceStore.getBoolean(AbstractTextEditor.PREFERENCE_COLOR_BACKGROUND_SYSTEM_DEFAULT);
if (fUseSystemColors) {
setBackgroundColor(null);
setForegroundColor(null);
} else {
RGB bg= createColor(fPreferenceStore, AbstractTextEditor.PREFERENCE_COLOR_BACKGROUND);
setBackgroundColor(bg);
RGB fg= createColor(fPreferenceStore, ICColorConstants.C_DEFAULT);
setForegroundColor(fg);
}
} else if (key.equals(ICColorConstants.C_DEFAULT)) {
if (!fUseSystemColors) {
RGB fg= createColor(fPreferenceStore, ICColorConstants.C_DEFAULT);
setForegroundColor(fg);
}
}
}
@Override
protected String getDocumentPartitioning() {
return ICPartitions.C_PARTITIONING;
}
@Override
protected void configureTextViewer(TextViewer textViewer) {
if (textViewer instanceof SourceViewer) {
((SourceViewer)textViewer).configure(getSourceViewerConfiguration());
}
}
/*
* @see org.eclipse.compare.contentmergeviewer.ContentMergeViewer#getTitle()
*/
@Override
public abstract String getTitle();
/**
* @return a source configuration for the viewer
*/
protected abstract SourceViewerConfiguration getSourceViewerConfiguration();
}