| /******************************************************************************* |
| * Copyright (c) 2007, 2011 Tasktop Technologies Inc. and others. |
| * |
| * This program and the accompanying materials are made available under the |
| * terms of the Eclipse Public License v. 2.0 which is available at |
| * https://www.eclipse.org/legal/epl-2.0 |
| * |
| * SPDX-License-Identifier: EPL-2.0 |
| * |
| * David Green - initial API and implementation |
| *******************************************************************************/ |
| |
| package org.eclipse.mylyn.commons.workbench.texteditor; |
| |
| import org.eclipse.core.commands.AbstractHandler; |
| import org.eclipse.core.commands.ExecutionEvent; |
| import org.eclipse.core.commands.ExecutionException; |
| import org.eclipse.jface.text.ITextViewer; |
| import org.eclipse.jface.text.source.ISourceViewer; |
| import org.eclipse.swt.custom.StyledText; |
| import org.eclipse.ui.handlers.HandlerUtil; |
| |
| /** |
| * Abstract command handler that can get the current text viewer. |
| * |
| * @author David Green |
| * @since 3.7 |
| */ |
| public abstract class AbstractTextViewerHandler extends AbstractHandler { |
| |
| /** |
| * get the {@link ITextViewer} for the given event. Depends on the <tt>activeFocusControl</tt> event variable being |
| * an instanceof {@link StyledText}. The {@link StyledText#getData(String))} is expected to have a value for one of |
| * <code>ITextViewer.class.getName()</code> or <code>ISourceViewer.class.getName()</code>. |
| * |
| * @return the text viewer or null if it cannot be found |
| */ |
| protected ITextViewer getTextViewer(ExecutionEvent event) throws ExecutionException { |
| Object activeFocusControl = HandlerUtil.getVariable(event, "activeFocusControl"); //$NON-NLS-1$ |
| if (activeFocusControl instanceof StyledText) { |
| StyledText textWidget = (StyledText) activeFocusControl; |
| ITextViewer viewer = (ITextViewer) textWidget.getData(ITextViewer.class.getName()); |
| if (viewer == null) { |
| viewer = (ITextViewer) textWidget.getData(ISourceViewer.class.getName()); |
| } |
| return viewer; |
| } |
| return null; |
| } |
| |
| } |