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diff --git a/bundles/org.simantics.g2d/src/org/simantics/g2d/canvas/impl/PaintableContextImpl.java b/bundles/org.simantics.g2d/src/org/simantics/g2d/canvas/impl/PaintableContextImpl.java
new file mode 100644
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--- /dev/null
+++ b/bundles/org.simantics.g2d/src/org/simantics/g2d/canvas/impl/PaintableContextImpl.java
@@ -0,0 +1,74 @@
+/*******************************************************************************
+ * Copyright (c) 2007, 2010 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:
+ *     VTT Technical Research Centre of Finland - initial API and implementation
+ *******************************************************************************/
+package org.simantics.g2d.canvas.impl;
+
+import java.lang.reflect.Method;
+
+import org.simantics.g2d.canvas.IContentContext;
+import org.simantics.utils.datastructures.ListenerList;
+import org.simantics.utils.threads.CurrentThread;
+import org.simantics.utils.threads.IThreadWorkQueue;
+import org.simantics.utils.threads.SyncListenerList;
+
+/**
+ * 
+ * @See {@link IContentContext}
+ * 
+ * @author Toni Kalajainen
+ */
+public class PaintableContextImpl implements IContentContext {
+
+	@Override
+	public void setDirty() {
+		fireSetDirty();		
+	}
+	
+	protected ListenerList<IContentListener> list =
+        new ListenerList<IContentListener>(IContentListener.class);
+	protected SyncListenerList<IContentListener> list2 =
+        new SyncListenerList<IContentListener>(IContentListener.class);
+
+	@Override
+    public void addPaintableContextListener(IContentListener listener) {
+        list.add(listener);
+    }
+	@Override
+    public void addPaintableContextListener(IContentListener listener, IThreadWorkQueue thread) {
+		if (thread==CurrentThread.getThreadAccess()) 
+			addPaintableContextListener(listener);
+		else
+			list2.add(thread, listener);
+    }    
+	@Override
+    public void removePaintableContextListener(IContentListener listener) {
+        list.remove(listener);
+    }
+	@Override
+    public void removePaintableContextListener(IContentListener listener, IThreadWorkQueue thread) {
+		if (thread==CurrentThread.getThreadAccess()) 
+			addPaintableContextListener(listener);
+		else
+			list2.remove(thread, listener);
+    }
+    private final static Method onDirty = SyncListenerList.getMethod(IContentListener.class, "onDirty");
+    protected void fireSetDirty() {
+    	for (IContentListener l : list.getListeners())
+    		l.onDirty(this);
+        list2.fireEventSync(onDirty, this);
+    }
+    protected void fireAsyncSetDirty() {
+        list2.fireEventAsync(onDirty, this);
+    }
+
+	
+	    
+}