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/*******************************************************************************
* Copyright (c) 2004, 2008 Tasktop Technologies 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:
* Tasktop Technologies - initial API and implementation
*******************************************************************************/
package org.eclipse.mylyn.internal.tasks.ui.commands;
import org.eclipse.core.commands.ExecutionEvent;
import org.eclipse.core.commands.ExecutionException;
import org.eclipse.jface.viewers.TreePath;
import org.eclipse.jface.viewers.TreeSelection;
import org.eclipse.jface.viewers.TreeViewer;
import org.eclipse.mylyn.internal.tasks.ui.util.TasksUiInternal;
import org.eclipse.mylyn.internal.tasks.ui.util.TreeWalker;
import org.eclipse.mylyn.internal.tasks.ui.util.TreeWalker.Direction;
import org.eclipse.mylyn.internal.tasks.ui.util.TreeWalker.TreeVisitor;
import org.eclipse.mylyn.internal.tasks.ui.views.TaskListView;
import org.eclipse.mylyn.tasks.core.IRepositoryElement;
import org.eclipse.mylyn.tasks.core.ITask;
import org.eclipse.swt.widgets.Tree;
import org.eclipse.swt.widgets.TreeItem;
/**
* @author Steffen Pingel
*/
public abstract class GoToUnreadTaskHandler extends AbstractTaskListViewHandler {
public static final String ID_NEXT = "org.eclipse.mylyn.tasklist.actions.goToNextUnread"; //$NON-NLS-1$
public static final String ID_PREVIOUS = "org.eclipse.mylyn.tasklist.actions.goToPreviousUnread"; //$NON-NLS-1$
private Direction direction = Direction.DOWN;
public Direction getDirection() {
return direction;
}
private TreePath getUnreadItem(TreeViewer treeViewer, Tree tree) {
TreeItem[] selection = tree.getSelection();
TreeItem selectedItem = (selection.length > 0) ? selection[0] : null;
TreeVisitor visitor = new TreeVisitor() {
@Override
public boolean visit(Object object) {
if (object instanceof ITask) {
ITask task = (ITask) object;
if (TasksUiInternal.shouldShowIncoming(task)) { // task.getSynchronizationState().isIncoming()
return true;
}
}
return false;
}
};
TreeWalker treeWalker = new TreeWalker(treeViewer);
treeWalker.setDirection(direction);
treeWalker.setExpandNodes(true);
return treeWalker.walk(visitor, selectedItem);
}
@Override
protected void execute(ExecutionEvent event, TaskListView taskListView, IRepositoryElement item) {
TreeViewer treeViewer = taskListView.getViewer();
Tree tree = treeViewer.getTree();
// need to expand nodes to traverse the tree, disable redraw to avoid flickering
TreePath treePath = null;
try {
tree.setRedraw(false);
treePath = getUnreadItem(treeViewer, tree);
} finally {
tree.setRedraw(true);
}
if (treePath != null) {
treeViewer.expandToLevel(treePath, 0);
treeViewer.setSelection(new TreeSelection(treePath), true);
}
}
public void setDirection(Direction direction) {
this.direction = direction;
}
public static void execute(ExecutionEvent event, Direction direction) throws ExecutionException {
GoToUnreadTaskHandler handler = new GoToUnreadTaskHandler() {
};
handler.setDirection(direction);
handler.execute(event);
}
public static class GoToNextUnreadTaskHandler extends GoToUnreadTaskHandler {
public GoToNextUnreadTaskHandler() {
setDirection(Direction.DOWN);
}
}
public static class GoToPreviousUnreadTaskHandler extends GoToUnreadTaskHandler {
public GoToPreviousUnreadTaskHandler() {
setDirection(Direction.UP);
}
}
}
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