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/*
* 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
* 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 THIRD_PARTY_BLINK_RENDERER_BINDINGS_CORE_V8_V8_ABSTRACT_EVENT_LISTENER_H_
#define THIRD_PARTY_BLINK_RENDERER_BINDINGS_CORE_V8_V8_ABSTRACT_EVENT_LISTENER_H_
#include "third_party/blink/renderer/core/core_export.h"
#include "third_party/blink/renderer/core/dom/events/event_listener.h"
#include "third_party/blink/renderer/platform/bindings/dom_wrapper_world.h"
#include "third_party/blink/renderer/platform/bindings/trace_wrapper_v8_reference.h"
#include "third_party/blink/renderer/platform/heap/self_keep_alive.h"
#include "v8/include/v8.h"
namespace blink {
class Event;
class EventTarget;
// 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 CORE_EXPORT V8AbstractEventListener : public EventListener {
public:
~V8AbstractEventListener() override;
static const V8AbstractEventListener* Cast(const EventListener* listener) {
return listener->GetType() == kJSEventListenerType
? static_cast<const V8AbstractEventListener*>(listener)
: nullptr;
}
static V8AbstractEventListener* Cast(EventListener* listener) {
return const_cast<V8AbstractEventListener*>(
Cast(const_cast<const EventListener*>(listener)));
}
static v8::Local<v8::Value> GetListenerOrNull(v8::Isolate*,
EventTarget*,
EventListener*);
// Implementation of EventListener interface.
bool operator==(const EventListener& other) const override {
return this == &other;
}
void handleEvent(ExecutionContext*, Event*) final;
virtual void HandleEvent(ScriptState*, Event*);
// Returns the listener object, either a function or an object, or the empty
// handle if the user script is not compilable. No exception will be thrown
// even if the user script is not compilable.
v8::Local<v8::Object> GetListenerObjectForInspector(
ExecutionContext* execution_context) final {
return GetListenerObjectInternal(execution_context);
}
v8::Local<v8::Object> GetListenerObject(ExecutionContext* execution_context) {
return GetListenerObjectInternal(execution_context);
}
v8::Local<v8::Object> GetExistingListenerObject() {
return listener_.NewLocal(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 listener_.Get();
}
bool HasExistingListenerObject() { return !listener_.IsEmpty(); }
void ClearListenerObject();
bool BelongsToTheCurrentWorld(ExecutionContext*) const final;
bool IsAttribute() const final { return is_attribute_; }
v8::Isolate* GetIsolate() const { return isolate_; }
DOMWrapperWorld* GetWorldForInspector() const final { return world_.get(); }
void Trace(blink::Visitor*) override;
protected:
V8AbstractEventListener(v8::Isolate*, bool is_attribute, DOMWrapperWorld&);
virtual v8::Local<v8::Object> GetListenerObjectInternal(
ExecutionContext* execution_context) {
return GetExistingListenerObject();
}
void SetListenerObject(ScriptState*,
v8::Local<v8::Object>,
const V8PrivateProperty::Symbol&);
void InvokeEventHandler(ScriptState*, Event*, v8::Local<v8::Value>);
// Get the receiver object to use for event listener call.
v8::Local<v8::Object> GetReceiverObject(ScriptState*, Event*);
DOMWrapperWorld& World() const { return *world_; }
private:
// This could return an empty handle and callers need to check return value.
// We don't use v8::MaybeLocal because it can fail without exception.
virtual v8::Local<v8::Value>
CallListenerFunction(ScriptState*, v8::Local<v8::Value> jsevent, Event*) = 0;
virtual bool ShouldPreventDefault(v8::Local<v8::Value> return_value, Event*);
static void WrapperCleared(
const v8::WeakCallbackInfo<V8AbstractEventListener>&);
TraceWrapperV8Reference<v8::Object> listener_;
// true if the listener is created through a DOM attribute.
bool is_attribute_;
scoped_refptr<DOMWrapperWorld> world_;
v8::Isolate* isolate_;
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_BINDINGS_CORE_V8_V8_ABSTRACT_EVENT_LISTENER_H_
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