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// Copyright 2018 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef THIRD_PARTY_BLINK_RENDERER_BINDINGS_CORE_V8_JS_EVENT_LISTENER_H_
#define THIRD_PARTY_BLINK_RENDERER_BINDINGS_CORE_V8_JS_EVENT_LISTENER_H_
#include "third_party/blink/renderer/bindings/core/v8/js_based_event_listener.h"
#include "third_party/blink/renderer/bindings/core/v8/v8_event_listener.h"
namespace blink {
// |JSEventListener| implements EventListener in the DOM standard.
// https://dom.spec.whatwg.org/#callbackdef-eventlistener
class CORE_EXPORT JSEventListener final : public JSBasedEventListener {
public:
static JSEventListener* CreateOrNull(V8EventListener* listener) {
return listener ? MakeGarbageCollected<JSEventListener>(listener) : nullptr;
}
explicit JSEventListener(V8EventListener* listener)
: event_listener_(listener) {}
// blink::CustomWrappable overrides:
void Trace(blink::Visitor*) override;
// blink::EventListener overrides:
//
// Check the identity of |V8EventListener::callback_object_|. There can be
// multiple CallbackInterfaceBase objects that have the same
// |CallbackInterfaceBase::callback_object_| but have different
// |CallbackInterfaceBase::incumbent_script_state_|s.
bool Matches(const EventListener& other) const override {
const auto* other_listener = DynamicTo<JSEventListener>(other);
return other_listener && event_listener_->HasTheSameCallbackObject(
*other_listener->event_listener_);
}
// blink::JSBasedEventListener overrides:
// TODO(crbug.com/881688): remove empty check for this method. This method
// should return v8::Object or v8::Null.
v8::Local<v8::Value> GetListenerObject(EventTarget&) override {
return event_listener_->CallbackObject();
}
v8::Local<v8::Value> GetEffectiveFunction(EventTarget&) override;
// Helper functions for DowncastTraits.
bool IsJSEventListener() const override { return true; }
protected:
// blink::JSBasedEventListener overrides:
v8::Isolate* GetIsolate() const override {
return event_listener_->GetIsolate();
}
ScriptState* GetScriptState() const override {
return event_listener_->CallbackRelevantScriptState();
}
ScriptState* GetScriptStateOrReportError(
const char* operation) const override {
return event_listener_->CallbackRelevantScriptStateOrReportError(
"EventListener", operation);
}
DOMWrapperWorld& GetWorld() const override {
return event_listener_->GetWorld();
}
private:
// blink::JSBasedEventListener override:
void InvokeInternal(EventTarget&,
Event&,
v8::Local<v8::Value> js_event) override;
const Member<V8EventListener> event_listener_;
};
template <>
struct DowncastTraits<JSEventListener> {
static bool AllowFrom(const EventListener& event_listener) {
auto* js_based = DynamicTo<JSBasedEventListener>(event_listener);
return js_based && js_based->IsJSEventListener();
}
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_BINDINGS_CORE_V8_JS_EVENT_LISTENER_H_
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