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diff --git a/indra/llui/llviewinject.h b/indra/llui/llviewinject.h
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+/**
+ * @file   llviewinject.h
+ * @author Nat Goodspeed
+ * @date   2011-08-16
+ * @brief  Supplemental LLView functionality used for simulating UI events.
+ * 
+ * $LicenseInfo:firstyear=2011&license=viewerlgpl$
+ * Copyright (c) 2011, Linden Research, Inc.
+ * $/LicenseInfo$
+ */
+
+#if ! defined(LL_LLVIEWINJECT_H)
+#define LL_LLVIEWINJECT_H
+
+#include "llview.h"
+#include <map>
+
+namespace llview
+{
+
+    /**
+     * TargetEvent is a callable with state, specifically intended for use as
+     * an LLView::TemporaryDrilldownFunc. Instantiate it with the desired
+     * target LLView*; pass it to a TemporaryDrilldownFunc instance;
+     * TargetEvent::operator() will then attempt to direct subsequent mouse
+     * events to the desired target LLView*. (This is an "attempt" because
+     * LLView will still balk unless the target LLView and every parent are
+     * visible and enabled.)
+     */
+    class TargetEvent
+    {
+    public:
+        /**
+         * Construct TargetEvent with the desired target LLView*. (See
+         * LLUI::resolvePath() to obtain an LLView* given a string pathname.)
+         * This sets up for operator().
+         */
+        TargetEvent(LLView* view);
+
+        /**
+         * This signature must match LLView::DrilldownFunc. When you install
+         * this TargetEvent instance using LLView::TemporaryDrilldownFunc,
+         * LLView will call this method to decide whether to propagate an
+         * incoming mouse event to the passed child LLView*.
+         */
+        bool operator()(const LLView*, S32 x, S32 y) const;
+
+    private:
+        // For a given parent LLView, identify which child to select.
+        typedef std::map<LLView*, LLView*> ChildMap;
+        ChildMap mChildMap;
+    };
+
+} // llview namespace
+
+#endif /* ! defined(LL_LLVIEWINJECT_H) */