diff -r 000000000000 -r 6474c204b198 gfx/skia/trunk/include/views/SkEventSink.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gfx/skia/trunk/include/views/SkEventSink.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,112 @@
+
+/*
+ * Copyright 2006 The Android Open Source Project
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+
+#ifndef SkEventSink_DEFINED
+#define SkEventSink_DEFINED
+
+#include "SkRefCnt.h"
+#include "SkEvent.h"
+
+struct SkTagList;
+
+/** \class SkEventSink
+
+    SkEventSink is the base class for all objects that receive SkEvents.
+*/
+class SkEventSink : public SkRefCnt {
+public:
+    SK_DECLARE_INST_COUNT(SkEventSink)
+
+             SkEventSink();
+    virtual ~SkEventSink();
+
+    /**
+     *  Returns this eventsink's unique ID. Use this to post SkEvents to
+     *  this eventsink.
+     */
+    SkEventSinkID getSinkID() const { return fID; }
+
+    /**
+     *  Call this to pass an event to this object for processing. Returns true if the
+     *  event was handled.
+     */
+    bool doEvent(const SkEvent&);
+
+    /** Returns true if the sink (or one of its subclasses) understands the event as a query.
+        If so, the sink may modify the event to communicate its "answer".
+    */
+    bool doQuery(SkEvent* query);
+
+    /**
+     *  Add sinkID to the list of listeners, to receive events from calls to sendToListeners()
+     *  and postToListeners(). If sinkID already exists in the listener list, no change is made.
+     */
+    void addListenerID(SkEventSinkID sinkID);
+
+    /**
+     *  Copy listeners from one event sink to another, typically from parent to child.
+     *  @param from the event sink to copy the listeners from
+     */
+    void copyListeners(const SkEventSink& from);
+
+    /**
+     *  Remove sinkID from the list of listeners. If sinkID does not appear in the list,
+     *  no change is made.
+     */
+    void removeListenerID(SkEventSinkID);
+
+    /**
+     *  Returns true if there are 1 or more listeners attached to this eventsink
+     */
+    bool hasListeners() const;
+
+    /**
+     *  Posts a copy of evt to each of the eventsinks in the lisener list.
+     *  This ignores the targetID and target proc in evt.
+     */
+    void postToListeners(const SkEvent& evt, SkMSec delay = 0);
+
+    enum EventResult {
+        kHandled_EventResult,       //!< the eventsink returned true from its doEvent method
+        kNotHandled_EventResult,    //!< the eventsink returned false from its doEvent method
+        kSinkNotFound_EventResult   //!< no matching eventsink was found for the event's getSink().
+    };
+
+    /**
+     *  DoEvent handles dispatching the event to its target ID or proc.
+     */
+    static EventResult DoEvent(const SkEvent&);
+
+    /**
+     *  Returns the matching eventsink, or null if not found
+     */
+    static SkEventSink* FindSink(SkEventSinkID);
+
+protected:
+    /** Override this to handle events in your subclass. Be sure to call the inherited version
+        for events that you don't handle.
+    */
+    virtual bool onEvent(const SkEvent&);
+    virtual bool onQuery(SkEvent*);
+
+    SkTagList*  findTagList(U8CPU tag) const;
+    void        addTagList(SkTagList*);
+    void        removeTagList(U8CPU tag);
+
+private:
+    SkEventSinkID   fID;
+    SkTagList*      fTagHead;
+
+    // for our private link-list
+    SkEventSink*    fNextSink;
+
+    typedef SkRefCnt INHERITED;
+};
+
+#endif