| /* |
| * 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 V8EventListenerHelper_h |
| #define V8EventListenerHelper_h |
| |
| #include "bindings/core/v8/V8Binding.h" |
| #include "bindings/core/v8/V8EventListener.h" |
| #include "core/CoreExport.h" |
| #include "wtf/Allocator.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 V8EventListenerHelper { |
| STATIC_ONLY(V8EventListenerHelper); |
| |
| public: |
| static V8EventListener* existingEventListener(v8::Local<v8::Value> value, |
| ScriptState* scriptState) { |
| DCHECK(scriptState->isolate()->InContext()); |
| if (!value->IsObject()) |
| return nullptr; |
| |
| v8::Local<v8::String> listenerProperty = |
| getHiddenProperty(false, scriptState->isolate()); |
| return findEventListener(v8::Local<v8::Object>::Cast(value), |
| listenerProperty, scriptState); |
| } |
| |
| template <typename ListenerType> |
| static V8EventListener* ensureEventListener(v8::Local<v8::Value>, |
| bool isAttribute, |
| ScriptState*); |
| |
| CORE_EXPORT static EventListener* getEventListener(ScriptState*, |
| v8::Local<v8::Value>, |
| bool isAttribute, |
| ListenerLookupType); |
| |
| private: |
| static V8EventListener* findEventListener( |
| v8::Local<v8::Object> object, |
| v8::Local<v8::String> listenerProperty, |
| ScriptState* scriptState) { |
| v8::HandleScope scope(scriptState->isolate()); |
| DCHECK(scriptState->isolate()->InContext()); |
| v8::Local<v8::Value> listener = |
| V8HiddenValue::getHiddenValue(scriptState, object, listenerProperty); |
| if (listener.IsEmpty()) |
| return nullptr; |
| return static_cast<V8EventListener*>( |
| v8::External::Cast(*listener)->Value()); |
| } |
| |
| static inline v8::Local<v8::String> getHiddenProperty(bool isAttribute, |
| v8::Isolate* isolate) { |
| return isAttribute |
| ? v8AtomicString(isolate, "EventListenerList::attributeListener") |
| : v8AtomicString(isolate, "EventListenerList::listener"); |
| } |
| }; |
| |
| template <typename ListenerType> |
| V8EventListener* V8EventListenerHelper::ensureEventListener( |
| v8::Local<v8::Value> value, |
| bool isAttribute, |
| ScriptState* scriptState) { |
| v8::Isolate* isolate = scriptState->isolate(); |
| DCHECK(isolate->InContext()); |
| if (!value->IsObject()) |
| return nullptr; |
| |
| v8::Local<v8::Object> object = v8::Local<v8::Object>::Cast(value); |
| v8::Local<v8::String> listenerProperty = |
| getHiddenProperty(isAttribute, isolate); |
| |
| V8EventListener* listener = |
| findEventListener(object, listenerProperty, scriptState); |
| if (listener) |
| return listener; |
| |
| listener = ListenerType::create(object, isAttribute, scriptState); |
| if (listener) |
| V8HiddenValue::setHiddenValue(scriptState, object, listenerProperty, |
| v8::External::New(isolate, listener)); |
| |
| return listener; |
| } |
| |
| } // namespace blink |
| |
| #endif // V8EventListenerHelper_h |