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-rw-r--r--skia/include/SkEventSink.h103
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diff --git a/skia/include/SkEventSink.h b/skia/include/SkEventSink.h
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--- a/skia/include/SkEventSink.h
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-/*
- * Copyright (C) 2006 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-#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:
- 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.
- */
- 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 searching for an eventsink object that matches the targetID.
- If one is found, it calls the sink's doEvent method, returning
- either kHandled_EventResult or kNotHandled_EventResult. If no matching
- eventsink is found, kSinkNotFound_EventResult is returned.
- */
- static EventResult DoEvent(const SkEvent&, SkEventSinkID targetID);
-
- /** 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;
-};
-
-#endif
-