/* ********************************************************************** **
** Copyright notice **
** **
** (c) 2005-2006 RSSOwl Development Team **
** http://www.rssowl.org/ **
** **
** 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.rssowl.org/legal/epl-v10.html **
** **
** A copy is found in the file epl-v10.html and important notices to the **
** license from the team is found in the textfile LICENSE.txt distributed **
** in this package. **
** **
** This copyright notice MUST APPEAR in all copies of the file! **
** **
** Contributors: **
** RSSOwl Development Team - initial API and implementation **
** **
** ********************************************************************** */
package org.rssowl.ui.internal.editors.feed;
import org.eclipse.jface.viewers.IContentProvider;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.jface.viewers.StructuredSelection;
import org.eclipse.jface.viewers.TreeViewer;
import org.eclipse.swt.widgets.Tree;
import org.eclipse.swt.widgets.TreeItem;
import org.eclipse.swt.widgets.Widget;
import org.rssowl.core.internal.persist.pref.DefaultPreferences;
import org.rssowl.ui.internal.util.TreeItemAdapter;
/**
* The actual TreeViewer responsible for displaying the Headlines of a Feed.
*
* @author Ismael Juma (ismael@juma.me.uk)
* @author bpasero
*/
public class NewsTableViewer extends TreeViewer {
private boolean fBlockRefresh;
private final NewsTableControl fNewsTableControl;
/**
* @param newsTableControl
* @param tree
*/
public NewsTableViewer(NewsTableControl newsTableControl, Tree tree) {
super(tree);
fNewsTableControl = newsTableControl;
}
/*
* @see org.eclipse.jface.viewers.StructuredViewer#refresh()
*/
@Override
public void refresh() {
if (!fBlockRefresh)
super.refresh();
}
/*
* @see org.eclipse.jface.viewers.TreeViewer#setContentProvider(org.eclipse.jface.viewers.IContentProvider)
*/
@Override
public void setContentProvider(IContentProvider provider) {
fBlockRefresh = true;
try {
super.setContentProvider(provider);
} finally {
fBlockRefresh = false;
}
}
/*
* @see org.eclipse.jface.viewers.AbstractTreeViewer#remove(java.lang.Object[])
*/
@Override
public void remove(final Object[] elements) {
updateSelectionAfterDelete(new Runnable() {
public void run() {
internalRemove(elements);
}
});
}
private void updateSelectionAfterDelete(Runnable runnable) {
Tree tree = (Tree) getControl();
IStructuredSelection selection = (IStructuredSelection) getSelection();
/* Nothing to do, since no selection */
if (selection.isEmpty()) {
runnable.run();
return;
}
/* Look for the minimal Index of all selected Elements */
int minSelectedIndex = Integer.MAX_VALUE;
TreeItemAdapter parentOfMinSelected = new TreeItemAdapter(tree);
/* For each selected Element */
Object[] selectedElements = selection.toArray();
for (Object selectedElement : selectedElements) {
Widget widget = findItem(selectedElement);
if (widget instanceof TreeItem) {
TreeItem item = (TreeItem) widget;
TreeItemAdapter parent = new TreeItemAdapter(item).getParent();
int index = parent.indexOf(item);
minSelectedIndex = Math.min(minSelectedIndex, index);
if (index == minSelectedIndex)
parentOfMinSelected.setItem(parent.getItem());
}
}
/* Perform Deletion */
runnable.run();
Object data = null;
/* Restore selection to next Element */
if (parentOfMinSelected.getItemCount() > minSelectedIndex)
data = parentOfMinSelected.getItem(minSelectedIndex).getData();
/* Restore selection to last Element */
else if (parentOfMinSelected.getItemCount() > 0)
data = parentOfMinSelected.getItem(parentOfMinSelected.getItemCount() - 1).getData();
/* Set selection if clean-up is not enabled */
if (data != null && !fNewsTableControl.getInputPreferences().getBoolean(DefaultPreferences.DEL_READ_NEWS_STATE))
setSelection(new StructuredSelection(data));
}
}