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/*******************************************************************************
* Copyright (c) 2009, 2013 David Green 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:
* David Green - initial API and implementation
*******************************************************************************/
package org.eclipse.mylyn.internal.wikitext.context.ui;
import java.util.ArrayList;
import java.util.List;
import org.eclipse.jface.preference.IPreferenceStore;
import org.eclipse.jface.util.IPropertyChangeListener;
import org.eclipse.jface.util.PropertyChangeEvent;
import org.eclipse.mylyn.context.core.AbstractContextListener;
import org.eclipse.mylyn.context.core.AbstractContextStructureBridge;
import org.eclipse.mylyn.context.core.ContextChangeEvent;
import org.eclipse.mylyn.context.core.ContextCore;
import org.eclipse.mylyn.context.core.IInteractionElement;
import org.eclipse.mylyn.internal.wikitext.ui.editor.IFoldingStructure;
import org.eclipse.mylyn.wikitext.parser.outline.OutlineItem;
import org.eclipse.mylyn.wikitext.parser.outline.OutlineItem.Visitor;
import org.eclipse.ui.IEditorPart;
/**
* based on implementation of ActiveFoldingListener in org.eclipse.mylyn.java.ui
*
* @author David Green
* @author Shawn Minto bug 274706 updated to use new 3.2 APIs.
*/
class ActiveFoldingListener extends AbstractContextListener {
private final IEditorPart part;
private final IFoldingStructure foldingStructure;
private org.eclipse.jface.util.IPropertyChangeListener preferenceListener = new IPropertyChangeListener() {
public void propertyChange(PropertyChangeEvent event) {
if (WikiTextContextUiPlugin.PREF_ACTIVE_FOLDING_ENABLED.equals(event.getProperty())) {
Object newValue = event.getNewValue();
foldingEnabled = Boolean.TRUE.toString().equals(newValue.toString());
updateFolding(false);
}
}
};
private boolean foldingEnabled;
private final AbstractContextStructureBridge bridge;
private final IPreferenceStore preferences;
public ActiveFoldingListener(IEditorPart part, IFoldingStructure foldingStructure) {
this.part = part;
this.foldingStructure = foldingStructure;
bridge = ContextCore.getStructureBridge(WikiTextContextStructureBridge.CONTENT_TYPE);
ContextCore.getContextManager().addListener(this);
preferences = WikiTextContextUiPlugin.getDefault().getPreferenceStore();
preferences.addPropertyChangeListener(preferenceListener);
foldingEnabled = preferences.getBoolean(WikiTextContextUiPlugin.PREF_ACTIVE_FOLDING_ENABLED);
updateFolding(false);
}
private void updateFolding(boolean elementsDeleted) {
if (!foldingStructure.isFoldingEnabled()) {
return;
}
if (!foldingEnabled || !ContextCore.getContextManager().isContextActive()) {
foldingStructure.expandAll();
} else {
OutlineItem outline = (OutlineItem) part.getAdapter(OutlineItem.class);
if (outline != null) {
final List<OutlineItem> toExpand = new ArrayList<OutlineItem>();
outline.accept(new Visitor() {
public boolean visit(OutlineItem item) {
String identifier = bridge.getHandleIdentifier(item);
IInteractionElement element = ContextCore.getContextManager().getElement(identifier);
if (element != null && element.getInterest().isInteresting()) {
toExpand.add(item);
}
return true;
}
});
if (toExpand.isEmpty()) {
foldingStructure.collapseAll(elementsDeleted);
} else {
foldingStructure.expandElementsExclusive(toExpand, elementsDeleted);
}
}
}
}
@Override
public void contextChanged(ContextChangeEvent event) {
switch (event.getEventKind()) {
case ACTIVATED:
if (foldingStructure.isFoldingEnabled()) {
updateFolding(false);
}
break;
case DEACTIVATED:
if (foldingStructure.isFoldingEnabled()) {
foldingStructure.expandAll();
}
break;
case CLEARED:
if (event.isActiveContext()) {
if (foldingStructure.isFoldingEnabled()) {
if (!foldingEnabled || !ContextCore.getContextManager().isContextActive()) {
foldingStructure.expandAll();
} else {
foldingStructure.collapseAll(true);
}
}
}
break;
case INTEREST_CHANGED:
if (foldingStructure.isFoldingEnabled()) {
updateFolding(false);
}
break;
case ELEMENTS_DELETED:
if (foldingStructure.isFoldingEnabled()) {
updateFolding(true);
}
break;
default:
break;
}
}
public void dispose() {
if (preferenceListener != null) {
preferences.removePropertyChangeListener(preferenceListener);
preferenceListener = null;
}
ContextCore.getContextManager().removeListener(this);
}
}
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