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/*******************************************************************************
* Copyright (c) 2000, 2018 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.debug.internal.ui.actions;
import org.eclipse.jface.action.Action;
import org.eclipse.jface.viewers.StructuredViewer;
import org.eclipse.jface.viewers.ViewerFilter;
import org.eclipse.swt.custom.BusyIndicator;
/**
* A generic Toggle filter action, meant to be subclassed to provide
* a specific filter.
*/
public abstract class ToggleFilterAction extends Action {
/**
* The viewer that this action works for
*/
private StructuredViewer fViewer;
/**
* The filter this action applies to the viewer
*/
private ViewerFilter fViewerFilter;
@Override
public void run() {
valueChanged(isChecked());
}
/**
* Adds or removes the viewer filter depending
* on the value of the parameter.
*/
protected void valueChanged(final boolean on) {
if (getViewer().getControl().isDisposed()) {
return;
}
BusyIndicator.showWhile(getViewer().getControl().getDisplay(), () -> {
if (on) {
ViewerFilter filter = getViewerFilter();
ViewerFilter[] filters = getViewer().getFilters();
boolean alreadyAdded = false;
for (int i = 0; i < filters.length; i++) {
ViewerFilter addedFilter = filters[i];
if (addedFilter.equals(filter)) {
alreadyAdded = true;
break;
}
}
if (!alreadyAdded) {
getViewer().addFilter(filter);
}
} else {
getViewer().removeFilter(getViewerFilter());
}
});
}
/**
* Returns the <code>ViewerFilter</code> that this action
* will add/remove from the viewer, or <code>null</code>
* if no filter is involved.
*/
protected ViewerFilter getViewerFilter() {
return fViewerFilter;
}
protected void setViewerFilter(ViewerFilter filter) {
fViewerFilter= filter;
}
protected StructuredViewer getViewer() {
return fViewer;
}
protected void setViewer(StructuredViewer viewer) {
fViewer = viewer;
}
}
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