| /******************************************************************************* |
| * Copyright (c) 2007, 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 |
| * Tom Schindl<tom.schindl@bestsolution.at> - initial API and implementation |
| * - fix in bug: 195908, 210752 |
| *******************************************************************************/ |
| |
| package org.eclipse.jface.viewers; |
| |
| import org.eclipse.swt.SWT; |
| import org.eclipse.swt.widgets.Event; |
| import org.eclipse.swt.widgets.Item; |
| import org.eclipse.swt.widgets.Tree; |
| import org.eclipse.swt.widgets.TreeItem; |
| |
| /** |
| * This class is responsible to provide the concept of cells for {@link Tree}. |
| * This concept is needed to provide features like editor activation with the |
| * keyboard |
| * |
| * @since 3.3 |
| * |
| */ |
| public class TreeViewerFocusCellManager extends SWTFocusCellManager { |
| private static final CellNavigationStrategy TREE_NAVIGATE = new CellNavigationStrategy() { |
| public void collapse(ColumnViewer viewer, ViewerCell cellToCollapse, |
| Event event) { |
| if (cellToCollapse != null) { |
| ((TreeItem) cellToCollapse.getItem()).setExpanded(false); |
| } |
| } |
| |
| public void expand(ColumnViewer viewer, ViewerCell cellToExpand, |
| Event event) { |
| if (cellToExpand != null) { |
| TreeViewer v = (TreeViewer) viewer; |
| v.setExpandedState(v.getTreePathFromItem((Item) cellToExpand |
| .getItem()), true); |
| } |
| } |
| |
| public boolean isCollapseEvent(ColumnViewer viewer, |
| ViewerCell cellToCollapse, Event event) { |
| |
| if (cellToCollapse == null) { |
| return false; |
| } |
| |
| return cellToCollapse != null |
| && ((TreeItem) cellToCollapse.getItem()).getExpanded() |
| && event.keyCode == SWT.ARROW_LEFT |
| && isFirstColumnCell(cellToCollapse); |
| } |
| |
| public boolean isExpandEvent(ColumnViewer viewer, |
| ViewerCell cellToExpand, Event event) { |
| |
| if (cellToExpand == null) { |
| return false; |
| } |
| |
| return cellToExpand != null |
| && ((TreeItem) cellToExpand.getItem()).getItemCount() > 0 |
| && !((TreeItem) cellToExpand.getItem()).getExpanded() |
| && event.keyCode == SWT.ARROW_RIGHT |
| && isFirstColumnCell(cellToExpand); |
| } |
| |
| private boolean isFirstColumnCell(ViewerCell cell) { |
| return cell.getViewerRow().getVisualIndex(cell.getColumnIndex()) == 0; |
| } |
| }; |
| |
| /** |
| * Create a new manager using a default navigation strategy: |
| * <ul> |
| * <li><code>SWT.ARROW_UP</code>: navigate to cell above</li> |
| * <li><code>SWT.ARROW_DOWN</code>: navigate to cell below</li> |
| * <li><code>SWT.ARROW_RIGHT</code>: on first column (collapses if item |
| * is expanded) else navigate to next visible cell on the right</li> |
| * <li><code>SWT.ARROW_LEFT</code>: on first column (expands if item is |
| * collapsed) else navigate to next visible cell on the left</li> |
| * </ul> |
| * |
| * @param viewer |
| * the viewer the manager is bound to |
| * @param focusDrawingDelegate |
| * the delegate responsible to highlight selected cell |
| */ |
| public TreeViewerFocusCellManager(TreeViewer viewer, |
| FocusCellHighlighter focusDrawingDelegate) { |
| this(viewer, focusDrawingDelegate, TREE_NAVIGATE); |
| } |
| |
| /** |
| * Create a new manager with a custom navigation strategy |
| * |
| * @param viewer |
| * the viewer the manager is bound to |
| * @param focusDrawingDelegate |
| * the delegate responsible to highlight selected cell |
| * @param navigationStrategy |
| * the strategy used to navigate the cells |
| */ |
| public TreeViewerFocusCellManager(TreeViewer viewer, |
| FocusCellHighlighter focusDrawingDelegate, |
| CellNavigationStrategy navigationStrategy) { |
| super(viewer, focusDrawingDelegate, navigationStrategy); |
| } |
| |
| ViewerCell getInitialFocusCell() { |
| Tree tree = (Tree) getViewer().getControl(); |
| |
| if (tree.getItemCount() > 0) { |
| return getViewer().getViewerRowFromItem(tree.getItem(0)).getCell(0); |
| } |
| |
| return null; |
| } |
| |
| public ViewerCell getFocusCell() { |
| ViewerCell cell = super.getFocusCell(); |
| Tree t = (Tree) getViewer().getControl(); |
| |
| // It is possible that the selection has changed under the hood |
| if (cell != null) { |
| if (t.getSelection().length == 1 |
| && t.getSelection()[0] != cell.getItem()) { |
| setFocusCell(getViewer().getViewerRowFromItem( |
| t.getSelection()[0]).getCell(cell.getColumnIndex())); |
| } |
| } |
| |
| return super.getFocusCell(); |
| } |
| } |