| /******************************************************************************* |
| * 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.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 (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); |
| } |
| |
| } |
| |
| } |