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diff --git a/bundles/org.simantics.g2d/src/org/simantics/g2d/tooltip/BaseTooltipParticipant.java b/bundles/org.simantics.g2d/src/org/simantics/g2d/tooltip/BaseTooltipParticipant.java
new file mode 100644
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+++ b/bundles/org.simantics.g2d/src/org/simantics/g2d/tooltip/BaseTooltipParticipant.java
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+/*******************************************************************************
+ * 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.tooltip;
+
+import java.util.concurrent.Future;
+import java.util.concurrent.TimeUnit;
+
+import javax.swing.ToolTipManager;
+
+import org.simantics.g2d.diagram.participant.AbstractDiagramParticipant;
+import org.simantics.g2d.element.IElement;
+import org.simantics.scenegraph.g2d.events.MouseEvent;
+import org.simantics.scenegraph.g2d.events.EventHandlerReflection.EventHandler;
+import org.simantics.scenegraph.g2d.events.MouseEvent.MouseButtonPressedEvent;
+import org.simantics.scenegraph.g2d.events.command.CommandEvent;
+import org.simantics.scenegraph.g2d.events.command.Commands;
+import org.simantics.utils.datastructures.hints.IHintContext.Key;
+import org.simantics.utils.datastructures.hints.IHintContext.KeyOf;
+import org.simantics.utils.threads.ThreadUtils;
+
+public abstract class BaseTooltipParticipant extends AbstractDiagramParticipant implements ITooltipParticipant {
+
+    // Element hint key for tooltips
+    public static Key TOOLTIP_KEY = new KeyOf(TooltipProvider.class, "TOOLTIP");
+
+    public int tooltipDelay = ToolTipManager.sharedInstance().getInitialDelay();
+
+    private IElement tooltipElement;
+    private TooltipProvider creator;
+    private boolean tooltipShowing = false;
+
+    private Future<?> delayRunnable = null;
+
+    private int x = 0;
+    private int y = 0;
+
+    @EventHandler(priority = 0)
+    public boolean handleKeyEvent(CommandEvent e) {
+        if (e.command == Commands.FOCUS_TOOLTIP) {
+            //System.out.println("Focus");
+            if (tooltipShowing && creator instanceof FocusableTooltipProvider) {
+                ((FocusableTooltipProvider)creator).focus();
+            }
+        }
+        return false;
+    }
+
+    @EventHandler(priority = Integer.MAX_VALUE)
+    public boolean handleMouseEvent(MouseEvent e) {
+        if (e.screenPosition != null) {
+            x = (int)e.screenPosition.getX();
+            y = (int)e.screenPosition.getY();
+        }
+        if (tooltipShowing) {
+
+            if (e instanceof MouseButtonPressedEvent) {
+                // this hides focused tooltip if mouse is clicked somewhere else that on the tooltip
+                hideTooltip();
+            }
+        }
+        return  false;
+    }
+
+    /**
+     * Shows tooltip immediately
+     */
+    public synchronized void showTooltip() {
+        if (tooltipElement == null)
+            return;
+        creator.showTooltip(tooltipElement,x,y);
+        tooltipShowing = true;
+    }
+
+    private void launchThread() {
+        if (delayRunnable != null) {
+            delayRunnable.cancel(false);
+            delayRunnable = null;
+        }
+        delayRunnable = ThreadUtils.getNonBlockingWorkExecutor().schedule(new Runnable() {
+            @Override
+            public void run() {
+                showTooltip();
+            }
+        }, tooltipDelay, TimeUnit.MILLISECONDS);
+    }
+
+    /**
+     * Tries to show tooltip for given element
+     * Does not show tooltip instantly, but uses delay
+     * @param element
+     */
+    public synchronized void showTooltipFor(IElement element) {
+        //System.out.println("showTooltipFor " + element);
+        if (tooltipShowing && (creator instanceof FocusableTooltipProvider) && ((FocusableTooltipProvider)creator).hasFocus())
+            return;
+        creator = element.getHint(TOOLTIP_KEY);
+        if (creator != null) {
+            tooltipElement = element;
+            launchThread();
+        } else {
+            hideTooltip();
+        }
+    }
+
+    /**
+     * Hides tooltip, if one is showing
+     */
+    public synchronized void hideTooltip() {
+        //System.out.println("hideTooltip");
+        if (tooltipShowing && (creator instanceof FocusableTooltipProvider) && ((FocusableTooltipProvider)creator).hasFocus())
+            return;
+        if (creator != null && tooltipShowing)
+            creator.hideTooltip(tooltipElement);
+        creator = null;
+        tooltipElement = null;
+        tooltipShowing = false;
+    }
+
+}