/*******************************************************************************
* Copyright (c) 2008, 2010 Matthew Hall 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:
* Matthew Hall - initial API and implementation (bug 194734)
* Matthew Hall - bugs 195222, 259380, 263413, 265561
******************************************************************************/
package org.eclipse.jface.internal.databinding.viewers;
import java.util.Collections;
import java.util.Iterator;
import java.util.Set;
import org.eclipse.core.databinding.observable.Diffs;
import org.eclipse.core.databinding.observable.set.SetDiff;
import org.eclipse.core.databinding.property.INativePropertyListener;
import org.eclipse.core.databinding.property.IProperty;
import org.eclipse.core.databinding.property.ISimplePropertyListener;
import org.eclipse.core.databinding.property.NativePropertyListener;
import org.eclipse.jface.databinding.viewers.ViewerSetProperty;
import org.eclipse.jface.viewers.CheckStateChangedEvent;
import org.eclipse.jface.viewers.ICheckStateListener;
import org.eclipse.jface.viewers.ICheckable;
import org.eclipse.jface.viewers.StructuredViewer;
/**
* @since 3.3
*
*/
public abstract class CheckboxViewerCheckedElementsProperty extends
ViewerSetProperty {
private final Object elementType;
/**
* @param elementType
*/
public CheckboxViewerCheckedElementsProperty(Object elementType) {
this.elementType = elementType;
}
public Object getElementType() {
return elementType;
}
protected final Set createElementSet(StructuredViewer viewer) {
return ViewerElementSet.withComparer(viewer.getComparer());
}
protected void doUpdateSet(Object source, SetDiff diff) {
ICheckable checkable = (ICheckable) source;
for (Iterator it = diff.getAdditions().iterator(); it.hasNext();)
checkable.setChecked(it.next(), true);
for (Iterator it = diff.getRemovals().iterator(); it.hasNext();)
checkable.setChecked(it.next(), false);
}
public INativePropertyListener adaptListener(
ISimplePropertyListener listener) {
return new CheckStateListener(this, listener);
}
private class CheckStateListener extends NativePropertyListener implements
ICheckStateListener {
private CheckStateListener(IProperty property,
ISimplePropertyListener listener) {
super(property, listener);
}
public void checkStateChanged(CheckStateChangedEvent event) {
Object element = event.getElement();
boolean checked = event.getChecked();
Set elementSet = createElementSet((StructuredViewer) event
.getCheckable());
elementSet.add(element);
Set additions = checked ? elementSet : Collections.EMPTY_SET;
Set removals = checked ? Collections.EMPTY_SET : elementSet;
SetDiff diff = Diffs.createSetDiff(additions, removals);
fireChange(event.getSource(), diff);
}
public void doAddTo(Object source) {
((ICheckable) source).addCheckStateListener(this);
}
public void doRemoveFrom(Object source) {
((ICheckable) source).removeCheckStateListener(this);
}
}
public String toString() {
String s = "ICheckable.checkedElements{}"; //$NON-NLS-1$
if (elementType != null)
s += " <" + elementType + ">"; //$NON-NLS-1$//$NON-NLS-2$
return s;
}
}