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The source code/*******************************************************************************
* Copyright (c) 2006, 2008 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.jface.viewers;
import java.util.HashSet;
import java.util.Set;
import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.Color;
import org.eclipse.swt.graphics.Rectangle;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.Listener;
/**
* OwnerDrawLabelProvider is an abstract implementation of a label provider that
* handles custom draw.
*
* <p>
* <b>This class is intended to be subclassed by implementors.
* </p>
*
* @since 3.3
*
*/
public abstract class OwnerDrawLabelProvider extends CellLabelProvider {
static class OwnerDrawListener implements Listener {
Set enabledColumns = new HashSet();
int enabledGlobally = 0;
private ColumnViewer viewer;
OwnerDrawListener(ColumnViewer viewer) {
this.viewer = viewer;
}
public void handleEvent(Event event) {
CellLabelProvider provider = viewer.getViewerColumn(event.index)
.getLabelProvider();
ViewerColumn column = viewer.getViewerColumn(event.index);
if (enabledGlobally > 0 || enabledColumns.contains(column)) {
if (provider instanceof OwnerDrawLabelProvider) {
Object element = event.item.getData();
OwnerDrawLabelProvider ownerDrawProvider = (OwnerDrawLabelProvider) provider;
switch (event.type) {
case SWT.MeasureItem:
ownerDrawProvider.measure(event, element);
break;
case SWT.PaintItem:
ownerDrawProvider.paint(event, element);
break;
case SWT.EraseItem:
ownerDrawProvider.erase(event, element);
break;
}
}
}
}
}
private static final String OWNER_DRAW_LABEL_PROVIDER_LISTENER = "owner_draw_label_provider_listener"; //$NON-NLS-1$
/**
* Set up the owner draw callbacks for the viewer.
*
* @param viewer
* the viewer the owner draw is set up
*
* @deprecated Since 3.4, the default implementation of
* {@link CellLabelProvider#initialize(ColumnViewer, ViewerColumn)}
* in this class will set up the necessary owner draw callbacks
* automatically. Calls to this method can be removed.
*/
public static void setUpOwnerDraw(final ColumnViewer viewer) {
getOrCreateOwnerDrawListener(viewer).enabledGlobally++;
}
/**
* @param viewer
* @param control
* @return
*/
private static OwnerDrawListener getOrCreateOwnerDrawListener(
final ColumnViewer viewer) {
Control control = viewer.getControl();
OwnerDrawListener listener = (OwnerDrawListener) control
.getData(OWNER_DRAW_LABEL_PROVIDER_LISTENER);
if (listener == null) {
listener = new OwnerDrawListener(viewer);
control.setData(OWNER_DRAW_LABEL_PROVIDER_LISTENER, listener);
control.addListener(SWT.MeasureItem, listener);
control.addListener(SWT.EraseItem, listener);
control.addListener(SWT.PaintItem, listener);
}
return listener;
}
/**
* Create a new instance of the receiver based on a column viewer.
*
*/
public OwnerDrawLabelProvider() {
}
public void dispose(ColumnViewer viewer, ViewerColumn column) {
if (!viewer.getControl().isDisposed()) {
setOwnerDrawEnabled(viewer, column, false);
}
super.dispose(viewer, column);
}
/**
* This implementation of
* {@link CellLabelProvider#initialize(ColumnViewer, ViewerColumn)}
* delegates to {@link #initialize(ColumnViewer, ViewerColumn, boolean)}
* with a value of <code>true for
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