--- /dev/null
+/*******************************************************************************
+ * Copyright (c) 2017 Association for Decentralized Information Management
+ * in Industry THTH ry.
+ * 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:
+ * Semantum Oy - (#7066) initial API and implementation
+ *******************************************************************************/
+package org.simantics.views.text.internal;
+
+import org.eclipse.jface.text.IUndoManager;
+import org.eclipse.jface.text.TextViewer;
+import org.eclipse.swt.widgets.Control;
+
+/**
+ * @author Tuukka Lehtonen
+ * @since 1.28.0
+ */
+public class TextViewerConstants {
+
+ /**
+ * The UI focus control context used for enabling normal text undo/redo for
+ * {@link TextViewer} controls.
+ */
+ public static final String CONTEXT_IN_TEXT_VIEWER = "inTextViewer";
+
+ /**
+ * A key used for storing an {@link IUndoManager} as data of a
+ * {@link Control} using {@link Control#setData(String, Object)}.
+ */
+ public static final String KEY_UNDO_MANAGER = "undoManager";
+
+}