| /* |
| * Copyright (C) 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 |
| * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (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 V8EventListenerList_h |
| #define V8EventListenerList_h |
| |
| #include "bindings/core/v8/V8Binding.h" |
| #include "bindings/core/v8/V8EventListener.h" |
| #include <v8.h> |
| |
| namespace blink { |
| |
| enum ListenerLookupType { |
| ListenerFindOnly, |
| ListenerFindOrCreate, |
| }; |
| |
| // This is a container for V8EventListener objects that uses hidden properties of v8::Object to speed up lookups. |
| class V8EventListenerList { |
| public: |
| static PassRefPtr<V8EventListener> findWrapper(v8::Local<v8::Value> value, ScriptState* scriptState) |
| { |
| ASSERT(scriptState->isolate()->InContext()); |
| if (!value->IsObject()) |
| return nullptr; |
| |
| v8::Handle<v8::String> wrapperProperty = getHiddenProperty(false, scriptState->isolate()); |
| return doFindWrapper(v8::Local<v8::Object>::Cast(value), wrapperProperty, scriptState); |
| } |
| |
| template<typename WrapperType> |
| static PassRefPtr<V8EventListener> findOrCreateWrapper(v8::Local<v8::Value>, bool isAttribute, ScriptState*); |
| |
| static void clearWrapper(v8::Handle<v8::Object> listenerObject, bool isAttribute, v8::Isolate* isolate) |
| { |
| v8::Handle<v8::String> wrapperProperty = getHiddenProperty(isAttribute, isolate); |
| listenerObject->DeleteHiddenValue(wrapperProperty); |
| } |
| |
| static PassRefPtr<EventListener> getEventListener(ScriptState*, v8::Local<v8::Value>, bool isAttribute, ListenerLookupType); |
| |
| private: |
| static V8EventListener* doFindWrapper(v8::Local<v8::Object> object, v8::Handle<v8::String> wrapperProperty, ScriptState* scriptState) |
| { |
| v8::HandleScope scope(scriptState->isolate()); |
| ASSERT(scriptState->isolate()->InContext()); |
| v8::Local<v8::Value> listener = object->GetHiddenValue(wrapperProperty); |
| if (listener.IsEmpty()) |
| return 0; |
| return static_cast<V8EventListener*>(v8::External::Cast(*listener)->Value()); |
| } |
| |
| static inline v8::Handle<v8::String> getHiddenProperty(bool isAttribute, v8::Isolate* isolate) |
| { |
| return isAttribute ? v8AtomicString(isolate, "attributeListener") : v8AtomicString(isolate, "listener"); |
| } |
| }; |
| |
| template<typename WrapperType> |
| PassRefPtr<V8EventListener> V8EventListenerList::findOrCreateWrapper(v8::Local<v8::Value> value, bool isAttribute, ScriptState* scriptState) |
| { |
| v8::Isolate* isolate = scriptState->isolate(); |
| ASSERT(isolate->InContext()); |
| if (!value->IsObject() |
| // Non-callable attribute setter input is treated as null (no wrapper) |
| || (isAttribute && !value->IsFunction())) |
| return nullptr; |
| |
| v8::Local<v8::Object> object = v8::Local<v8::Object>::Cast(value); |
| v8::Handle<v8::String> wrapperProperty = getHiddenProperty(isAttribute, isolate); |
| |
| V8EventListener* wrapper = doFindWrapper(object, wrapperProperty, scriptState); |
| if (wrapper) |
| return wrapper; |
| |
| RefPtr<V8EventListener> wrapperPtr = WrapperType::create(object, isAttribute, scriptState); |
| if (wrapperPtr) |
| object->SetHiddenValue(wrapperProperty, v8::External::New(isolate, wrapperPtr.get())); |
| |
| return wrapperPtr; |
| } |
| |
| } // namespace blink |
| |
| #endif // V8EventListenerList_h |