1 files changed, 93 insertions, 0 deletions
diff --git a/bundles/org.eclipse.compare/compare/org/eclipse/compare/internal/TextEditorPropertyAction.java b/bundles/org.eclipse.compare/compare/org/eclipse/compare/internal/TextEditorPropertyAction.java
new file mode 100644
index 000000000..2ae3c4127
--- /dev/null
+++ b/bundles/org.eclipse.compare/compare/org/eclipse/compare/internal/TextEditorPropertyAction.java
@@ -0,0 +1,93 @@
+/*******************************************************************************
+ * Copyright (c) 2007, 2011 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
+ *******************************************************************************/
+package org.eclipse.compare.internal;
+
+import org.eclipse.jface.action.Action;
+import org.eclipse.jface.action.IAction;
+import org.eclipse.jface.preference.IPreferenceStore;
+import org.eclipse.jface.util.IPropertyChangeListener;
+import org.eclipse.jface.util.PropertyChangeEvent;
+import org.eclipse.ui.editors.text.EditorsUI;
+
+public class TextEditorPropertyAction extends Action implements IPropertyChangeListener {
+
+	private final MergeSourceViewer[] viewers;
+	private final String preferenceKey;
+	private IPreferenceStore store;
+
+	public TextEditorPropertyAction(String label, MergeSourceViewer[] viewers, String preferenceKey) {
+		super(label, IAction.AS_CHECK_BOX);
+		this.viewers = viewers;
+		this.preferenceKey = preferenceKey;
+		this.store = EditorsUI.getPreferenceStore();
+		if (store != null)
+			store.addPropertyChangeListener(this);
+		synchronizeWithPreference();
+		addActionToViewers();
+	}
+
+	private void addActionToViewers() {
+		for (int i = 0; i < viewers.length; i++) {
+			MergeSourceViewer viewer = viewers[i];
+			viewer.addTextAction(this);
+		}
+	}
+
+	public MergeSourceViewer[] getViewers() {
+		return viewers;
+	}
+
+	@Override
+	public void propertyChange(PropertyChangeEvent event) {
+		if (event.getProperty().equals(getPreferenceKey())) {
+			synchronizeWithPreference();
+		}
+	}
+
+	protected void synchronizeWithPreference() {
+		boolean checked = false;
+		if (store != null) {
+			checked = store.getBoolean(getPreferenceKey());
+		}
+		if (checked != isChecked()) {
+			if (toggleState(checked))
+				setChecked(checked);
+		}
+	}
+
+	public String getPreferenceKey() {
+		return preferenceKey;
+	}
+
+	@Override
+	public void run() {
+		toggleState(isChecked());
+		if (store != null)
+			store.setValue(getPreferenceKey(), isChecked());
+	}
+
+	public void dispose() {
+		if (store != null)
+			store.removePropertyChangeListener(this);
+	}
+
+	/**
+	 * @param checked
+	 *            new state
+	 * @return <code>true</code> if state has been changed, toggle has been
+	 *         successful
+	 */
+	protected boolean toggleState(boolean checked) {
+		// No-op by default
+		return false;
+	}
+
+}