| /* |
| * Copyright (C) 2006, 2007, 2008, 2009 Google Inc. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions are |
| * met: |
| * |
| * * Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * * Redistributions in binary form must reproduce the above |
| * copyright notice, this list of conditions and the following disclaimer |
| * in the documentation and/or other materials provided with the |
| * distribution. |
| * * Neither the name of Google Inc. nor the names of its |
| * contributors may be used to endorse or promote products derived from |
| * this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #ifndef V8AbstractEventListener_h |
| #define V8AbstractEventListener_h |
| |
| #include "bindings/core/v8/DOMWrapperWorld.h" |
| #include "bindings/core/v8/ScopedPersistent.h" |
| #include "core/events/EventListener.h" |
| #include "wtf/PassRefPtr.h" |
| #include "wtf/RefCounted.h" |
| #include <v8.h> |
| |
| namespace blink { |
| |
| class Event; |
| |
| // There are two kinds of event listeners: HTML or non-HMTL. onload, |
| // onfocus, etc (attributes) are always HTML event handler type; Event |
| // listeners added by Window.addEventListener or |
| // EventTargetNode::addEventListener are non-HTML type. |
| // |
| // Why does this matter? |
| // WebKit does not allow duplicated HTML event handlers of the same type, |
| // but ALLOWs duplicated non-HTML event handlers. |
| class V8AbstractEventListener : public EventListener { |
| public: |
| virtual ~V8AbstractEventListener(); |
| |
| static const V8AbstractEventListener* cast(const EventListener* listener) |
| { |
| return listener->type() == JSEventListenerType |
| ? static_cast<const V8AbstractEventListener*>(listener) |
| : 0; |
| } |
| |
| static V8AbstractEventListener* cast(EventListener* listener) |
| { |
| return const_cast<V8AbstractEventListener*>(cast(const_cast<const EventListener*>(listener))); |
| } |
| |
| // Implementation of EventListener interface. |
| |
| virtual bool operator==(const EventListener& other) override { return this == &other; } |
| |
| virtual void handleEvent(ExecutionContext*, Event*) override; |
| |
| // Returns the listener object, either a function or an object. |
| v8::Local<v8::Object> getListenerObject(ExecutionContext* context) |
| { |
| // prepareListenerObject can potentially deref this event listener |
| // as it may attempt to compile a function (lazy event listener), get an error |
| // and invoke onerror callback which can execute arbitrary JS code. |
| // Protect this event listener to keep it alive. |
| RefPtr<V8AbstractEventListener> guard(this); |
| prepareListenerObject(context); |
| return m_listener.newLocal(m_isolate); |
| } |
| |
| v8::Local<v8::Object> getExistingListenerObject() |
| { |
| return m_listener.newLocal(m_isolate); |
| } |
| |
| // Provides access to the underlying handle for GC. Returned |
| // value is a weak handle and so not guaranteed to stay alive. |
| v8::Persistent<v8::Object>& existingListenerObjectPersistentHandle() |
| { |
| return m_listener.getUnsafe(); |
| } |
| |
| bool hasExistingListenerObject() |
| { |
| return !m_listener.isEmpty(); |
| } |
| |
| void clearListenerObject() |
| { |
| m_listener.clear(); |
| } |
| |
| virtual bool belongsToTheCurrentWorld() const override final; |
| v8::Isolate* isolate() const { return m_isolate; } |
| virtual DOMWrapperWorld& world() const { return scriptState()->world(); } |
| ScriptState* scriptState() const |
| { |
| ASSERT(m_scriptState); |
| return m_scriptState.get(); |
| } |
| void setScriptState(ScriptState* scriptState) { m_scriptState = scriptState; } |
| |
| protected: |
| V8AbstractEventListener(bool isAttribute, ScriptState*); |
| V8AbstractEventListener(bool isAttribute, v8::Isolate*); |
| |
| virtual void prepareListenerObject(ExecutionContext*) { } |
| |
| void setListenerObject(v8::Handle<v8::Object>); |
| |
| void invokeEventHandler(Event*, v8::Local<v8::Value> jsEvent); |
| |
| // Get the receiver object to use for event listener call. |
| v8::Local<v8::Object> getReceiverObject(Event*); |
| |
| private: |
| // Implementation of EventListener function. |
| virtual bool virtualisAttribute() const override { return m_isAttribute; } |
| |
| virtual v8::Local<v8::Value> callListenerFunction(v8::Handle<v8::Value> jsevent, Event*) = 0; |
| |
| virtual bool shouldPreventDefault(v8::Local<v8::Value> returnValue); |
| |
| static void setWeakCallback(const v8::WeakCallbackData<v8::Object, V8AbstractEventListener>&); |
| |
| ScopedPersistent<v8::Object> m_listener; |
| |
| // Indicates if this is an HTML type listener. |
| bool m_isAttribute; |
| |
| // For V8LazyEventListener, m_scriptState can be 0 until V8LazyEventListener is actually used. |
| // m_scriptState is set lazily because V8LazyEventListener doesn't know the associated frame |
| // until the listener is actually used. |
| RefPtr<ScriptState> m_scriptState; |
| v8::Isolate* m_isolate; |
| }; |
| |
| } // namespace blink |
| |
| #endif // V8AbstractEventListener_h |