--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dwtx/jface/viewers/CellNavigationStrategy.d	Mon Mar 31 00:47:19 2008 +0200
@@ -0,0 +1,176 @@
+/*******************************************************************************
+ * Copyright (c) 2007 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
+ * Port to the D programming language:
+ *     Frank Benoit <benoit@tionex.de>
+ ******************************************************************************/
+
+module dwtx.jface.viewers.CellNavigationStrategy;
+
+import dwtx.jface.viewers.ColumnViewer;
+import dwtx.jface.viewers.ViewerCell;
+
+import dwt.DWT;
+import dwt.widgets.Event;
+
+/**
+ * This class implementation the strategy how the table is navigated using the
+ * keyboard.
+ *
+ * <p>
+ * <b>Subclasses can implement their custom navigation algorithms</b>
+ * </p>
+ *
+ * @since 3.3
+ *
+ */
+public class CellNavigationStrategy {
+    /**
+     * is the given event an event which moves the selection to another cell
+     *
+     * @param viewer
+     *            the viewer we are working for
+     * @param event
+     *            the key event
+     * @return <code>true</code> if a new cell is searched
+     */
+    public bool isNavigationEvent(ColumnViewer viewer, Event event) {
+        switch (event.keyCode) {
+        case DWT.ARROW_UP:
+        case DWT.ARROW_DOWN:
+        case DWT.ARROW_LEFT:
+        case DWT.ARROW_RIGHT:
+        case DWT.HOME:
+        case DWT.PAGE_DOWN:
+        case DWT.PAGE_UP:
+        case DWT.END:
+            return true;
+        default:
+            return false;
+        }
+    }
+
+    /**
+     * @param viewer
+     *            the viewer we are working for
+     * @param cellToCollapse
+     *            the cell to collapse
+     * @param event
+     *            the key event
+     * @return <code>true</code> if this event triggers collapsing of a node
+     */
+    public bool isCollapseEvent(ColumnViewer viewer,
+            ViewerCell cellToCollapse, Event event) {
+        return false;
+    }
+
+    /**
+     * @param viewer
+     *            the viewer we are working for
+     * @param cellToExpand
+     *            the cell to expand
+     * @param event
+     *            the key event
+     * @return <code>true</code> if this event triggers expanding of a node
+     */
+    public bool isExpandEvent(ColumnViewer viewer, ViewerCell cellToExpand,
+            Event event) {
+        return false;
+    }
+
+    /**
+     * @param viewer
+     *            the viewer working for
+     * @param cellToExpand
+     *            the cell the user wants to expand
+     * @param event
+     *            the event triggering the expansion
+     */
+    public void expand(ColumnViewer viewer, ViewerCell cellToExpand, Event event) {
+
+    }
+
+    /**
+     * @param viewer
+     *            the viewer working for
+     * @param cellToCollapse
+     *            the cell the user wants to collapse
+     * @param event
+     *            the event triggering the expansion
+     */
+    public void collapse(ColumnViewer viewer, ViewerCell cellToCollapse,
+            Event event) {
+
+    }
+
+    /**
+     * @param viewer
+     *            the viewer we are working for
+     * @param currentSelectedCell
+     *            the cell currently selected
+     * @param event
+     *            the key event
+     * @return the cell which is highlighted next or <code>null</code> if the
+     *         default implementation is taken. E.g. it's fairly impossible to
+     *         react on PAGE_DOWN requests
+     */
+    public ViewerCell findSelectedCell(ColumnViewer viewer,
+            ViewerCell currentSelectedCell, Event event) {
+
+        switch (event.keyCode) {
+        case DWT.ARROW_UP:
+            if (currentSelectedCell !is null) {
+                return currentSelectedCell.getNeighbor(ViewerCell.ABOVE, false);
+            }
+            break;
+        case DWT.ARROW_DOWN:
+            if (currentSelectedCell !is null) {
+                return currentSelectedCell.getNeighbor(ViewerCell.BELOW, false);
+            }
+            break;
+        case DWT.ARROW_LEFT:
+            if (currentSelectedCell !is null) {
+                return currentSelectedCell.getNeighbor(ViewerCell.LEFT, true);
+            }
+            break;
+        case DWT.ARROW_RIGHT:
+            if (currentSelectedCell !is null) {
+                return currentSelectedCell.getNeighbor(ViewerCell.RIGHT, true);
+            }
+            break;
+        }
+
+        return null;
+    }
+
+    /**
+     * This method is consulted to decide whether an event has to be canceled or
+     * not. By default events who collapse/expand tree-nodes are canceled
+     *
+     * @param viewer
+     *            the viewer working for
+     * @param event
+     *            the event
+     * @return <code>true</code> if the event has to be canceled
+     */
+    public bool shouldCancelEvent(ColumnViewer viewer, Event event) {
+        return event.keyCode is DWT.ARROW_LEFT
+                || event.keyCode is DWT.ARROW_RIGHT;
+    }
+
+    /**
+     * This method is called by the framework to initialize this navigation
+     * strategy object. Subclasses may extend.
+     */
+    protected void init() {
+    }
+    package void init_package() {
+        init();
+    }
+}