| /* |
| * Copyright 2002,2004 The Apache Software Foundation. |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package org.apache.commons.jelly.tags.jface; |
| |
| import org.apache.commons.jelly.JellyTagException; |
| import org.apache.commons.jelly.MissingAttributeException; |
| import org.apache.commons.jelly.TagSupport; |
| import org.apache.commons.jelly.XMLOutput; |
| import org.apache.commons.logging.Log; |
| import org.apache.commons.logging.LogFactory; |
| import org.eclipse.jface.viewers.ISelectionChangedListener; |
| import org.eclipse.jface.viewers.SelectionChangedEvent; |
| import org.eclipse.jface.viewers.Viewer; |
| |
| /** |
| * This tag adds a listener for selection changes in this viewer. |
| * |
| * @author <a href="mailto:ckl@dacelo.nl">Christiaan ten Klooster</a> |
| */ |
| public class SelectionChangedListenerTag |
| extends TagSupport |
| implements ISelectionChangedListener { |
| |
| /** The Log to which logging calls will be made. */ |
| private static final Log log = |
| LogFactory.getLog(SelectionChangedListenerTag.class); |
| |
| private String var = "event"; |
| private XMLOutput output; |
| |
| /* |
| * @see org.apache.commons.jelly.Tag#doTag(org.apache.commons.jelly.XMLOutput) |
| */ |
| public void doTag(XMLOutput output) |
| throws MissingAttributeException, JellyTagException { |
| if (var == null) { |
| throw new MissingAttributeException("var"); |
| } |
| |
| Viewer viewer = getParentViewer(); |
| if (viewer == null) { |
| throw new JellyTagException("This tag must be nested within a viewer tag"); |
| } |
| |
| viewer.addSelectionChangedListener(this); |
| this.output = output; |
| } |
| |
| public Viewer getParentViewer() { |
| ViewerTag tag = (ViewerTag) findAncestorWithClass(ViewerTag.class); |
| if (tag != null) { |
| return tag.getViewer(); |
| } |
| return null; |
| } |
| |
| /** |
| * @return String |
| */ |
| public String getVar() { |
| return var; |
| } |
| |
| /** |
| * Sets the var. |
| * @param var The var to set |
| */ |
| public void setVar(String var) { |
| this.var = var; |
| } |
| |
| // Listener interface |
| //------------------------------------------------------------------------- |
| |
| /* |
| * @see org.eclipse.jface.viewers.ISelectionChangedListener#selectionChanged(org.eclipse.jface.viewers.SelectionChangedEvent) |
| */ |
| public void selectionChanged(SelectionChangedEvent event) { |
| try { |
| context.setVariable(var, event); |
| invokeBody(output); |
| } catch (Exception e) { |
| log.error( |
| "Caught exception: " + e + " while processing event: " + event, |
| e); |
| } |
| } |
| |
| } |