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diff --git a/bundles/org.simantics.g2d/src/org/simantics/g2d/canvas/impl/MouseCaptureContext.java b/bundles/org.simantics.g2d/src/org/simantics/g2d/canvas/impl/MouseCaptureContext.java
new file mode 100644
index 000000000..4b42819af
--- /dev/null
+++ b/bundles/org.simantics.g2d/src/org/simantics/g2d/canvas/impl/MouseCaptureContext.java
@@ -0,0 +1,94 @@
+/*******************************************************************************
+ * 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 java.util.HashMap;
+import java.util.HashSet;
+import java.util.Map;
+import java.util.Set;
+
+import org.simantics.g2d.canvas.IMouseCaptureContext;
+import org.simantics.g2d.canvas.IMouseCaptureHandle;
+import org.simantics.g2d.canvas.IMouseCaptureHandleListener;
+import org.simantics.g2d.canvas.IMouseCaptureListener;
+import org.simantics.utils.threads.IThreadWorkQueue;
+import org.simantics.utils.threads.SyncListenerList;
+
+/**
+ * @author Toni Kalajainen
+ */
+public class MouseCaptureContext implements IMouseCaptureContext {
+
+    protected Map<Integer, Set<IMouseCaptureHandle>> mouseCapture = 
+        new HashMap<Integer, Set<IMouseCaptureHandle>>();
+    
+    protected SyncListenerList<IMouseCaptureListener> mouseCaptureListeners =
+        new SyncListenerList<IMouseCaptureListener>(IMouseCaptureListener.class);
+    
+    public void addMouseCaptureListener(IMouseCaptureListener listener) {
+        mouseCaptureListeners.add(listener);
+    }
+    public void addMouseCaptureListener(IMouseCaptureListener listener, IThreadWorkQueue thread) {
+        mouseCaptureListeners.add(thread, listener);
+    }    
+    public void removeMouseCaptureListener(IMouseCaptureListener listener) {
+        mouseCaptureListeners.remove(listener);
+    }
+    public void removeMouseCaptureListener(IMouseCaptureListener listener, IThreadWorkQueue thread) {
+        mouseCaptureListeners.remove(thread, listener);
+    }
+    
+    private final static Method onMouseCaptured = SyncListenerList.getMethod(IMouseCaptureListener.class, "onMouseCaptured");
+    private final static Method onMouseReleased = SyncListenerList.getMethod(IMouseCaptureListener.class, "onMouseReleased");
+    protected void fireMouseCaptured(int mouseId) {
+        mouseCaptureListeners.fireEventSync(onMouseCaptured, this, mouseId);
+    }
+    protected void fireAsyncMouseCaptured(int mouseId) {
+        mouseCaptureListeners.fireEventAsync(onMouseCaptured, this, mouseId);
+    }
+    protected void fireMouseReleased(int mouseId) {
+        mouseCaptureListeners.fireEventSync(onMouseReleased, this, mouseId);
+    }
+    protected void fireAsyncMouseReleased(int mouseId) {
+        mouseCaptureListeners.fireEventAsync(onMouseReleased, this, mouseId);
+    }
+    
+    public synchronized IMouseCaptureHandle captureMouse(int mouseId) {
+        Set<IMouseCaptureHandle> captures = mouseCapture.get(mouseId);
+        IMouseCaptureHandle capture = new MouseCaptureHandle(mouseId);
+        capture.addMouseCaptureHandleListener(new IMouseCaptureHandleListener() {
+            @Override
+            public void onCaptureReleased(IMouseCaptureHandle sender) {
+                synchronized(MouseCaptureContext.this)
+                {
+                    Set<IMouseCaptureHandle> captures = mouseCapture.get(sender.mouseId());
+                    if (!captures.contains(this)) return;
+                    captures.remove(this);
+                    if (captures.isEmpty()) {
+                        mouseCapture.remove(captures);
+                        fireMouseReleased(sender.mouseId());
+                    }
+                }
+            }});
+        if (captures==null) {
+            captures = new HashSet<IMouseCaptureHandle>();
+            mouseCapture.put(mouseId, captures);
+            fireMouseCaptured(mouseId);
+        }
+        captures.add(capture);
+        return capture;
+    }
+
+    
+
+}