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/*****************************************************************************
* Copyright (c) 2011 CEA LIST.
*
* 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:
* Camille Letavernier (CEA LIST) camille.letavernier@cea.fr - Initial API and implementation
*****************************************************************************/
package org.eclipse.papyrus.infra.widgets.providers;
import org.eclipse.jface.viewers.StructuredViewer;
import org.eclipse.jface.viewers.Viewer;
import org.eclipse.jface.viewers.ViewerFilter;
import org.eclipse.papyrus.infra.widgets.editors.AbstractEditor;
import org.eclipse.papyrus.infra.widgets.editors.ICommitListener;
import org.eclipse.papyrus.infra.widgets.editors.StringEditor;
import org.eclipse.swt.SWT;
import org.eclipse.swt.widgets.Composite;
/**
* A generic implementation for a IGraphicalContentProvider.
* This class doesn't provide any element, and should be extended.
*
* It implements a filter for List or Tree elements, based on the label
* provided by the viewer's label provider (Or Object#toString() if the viewer
* doesn't have a label provider).
*
* A Text widget is added before the display control to insert the filter
* pattern. An element is matched if at least one of these conditions is
* matched :
* - The element's name matches the pattern
* - One of the element's children matches the pattern
* - One of the element's parent matches the pattern
*
* The elements' hierarchy is obtained via the viewer's ContentProvider.
*
* @author Camille Letavernier
*/
//TODO : Encapsulate a IStructuredContentProvider and make this class concrete
public abstract class AbstractFilteredContentProvider implements IGraphicalContentProvider {
protected StructuredViewer viewer;
private StringEditor filterPattern;
private PatternViewerFilter filter;
public static final String BASE_PATTERN = "*"; //$NON-NLS-1$
protected boolean showIfHasVisibleParent = false;
public void dispose() {
// Nothing
}
public void inputChanged(Viewer viewer, Object oldInput, Object newInput) {
if(viewer instanceof StructuredViewer) {
this.viewer = (StructuredViewer)viewer;
updateFilter();
}
}
private void updateFilter() {
if(this.viewer != null && filterPattern != null) {
this.viewer.setFilters(new ViewerFilter[]{ filter });
}
}
public void createBefore(Composite parent) {
filterPattern = new StringEditor(parent, SWT.NONE, "Filter : "); //$NON-NLS-1$
filterPattern.setValidateOnDelay(true);
filterPattern.setValue(BASE_PATTERN);
filter = getViewerFilter();
filterPattern.addCommitListener(new ICommitListener() {
public void commit(AbstractEditor editor) {
filter.setPattern((String)filterPattern.getValue());
viewer.refresh();
}
});
updateFilter();
}
public void createAfter(Composite parent) {
//Nothing
}
protected PatternViewerFilter getViewerFilter() {
PatternViewerFilter filter = new PatternViewerFilter();
filter.setStrict(false);
filter.setPattern(BASE_PATTERN);
filter.setShowIfHasVisibleParent(showIfHasVisibleParent);
return filter;
}
}
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