event.cc

// Copyright (c) 2014 GitHub, Inc.
// Use of this source code is governed by the MIT license that can be
// found in the LICENSE file.

#include "atom/browser/api/event.h"

#include <memory>

#include "atom/common/api/api_messages.h"
#include "atom/common/native_mate_converters/string16_converter.h"
#include "atom/common/native_mate_converters/v8_value_converter.h"
#include "atom/common/native_mate_converters/value_converter.h"
#include "content/public/browser/render_frame_host.h"
#include "content/public/browser/web_contents.h"
#include "native_mate/object_template_builder.h"

namespace mate {

Event::Event(v8::Isolate* isolate) {
  Init(isolate);
}

Event::~Event() {}

void Event::SetSenderAndMessage(content::RenderFrameHost* sender,
                                IPC::Message* message) {
  DCHECK(!sender_);
  DCHECK(!message_);
  sender_ = sender;
  message_ = message;

  Observe(content::WebContents::FromRenderFrameHost(sender));
}

void Event::RenderFrameDeleted(content::RenderFrameHost* rfh) {
  if (sender_ != rfh)
    return;
  sender_ = nullptr;
  message_ = nullptr;
}

void Event::RenderFrameHostChanged(content::RenderFrameHost* old_rfh,
                                   content::RenderFrameHost* new_rfh) {
  if (sender_ && sender_ == old_rfh)
    sender_ = new_rfh;
}

void Event::FrameDeleted(content::RenderFrameHost* rfh) {
  if (sender_ != rfh)
    return;
  sender_ = nullptr;
  message_ = nullptr;
}

void Event::PreventDefault(v8::Isolate* isolate) {
  GetWrapper()->Set(StringToV8(isolate, "defaultPrevented"), v8::True(isolate));
}

void Event::GetReturnValue(v8::Isolate* isolate) {}

bool Event::SetReturnValue(v8::Isolate* isolate, v8::Local<v8::Value> val) {
  atom::V8ValueConverter converter;
  auto* value = converter.FromV8Value(val, isolate->GetCurrentContext());

  base::ListValue result;
  result.Append(std::unique_ptr<base::Value>(value));

  return SendReply(result);
}

bool Event::SendReply(const base::ListValue& result) {
  if (message_ == nullptr || sender_ == nullptr)
    return false;

  AtomFrameHostMsg_Message_Sync::WriteReplyParams(message_, result);
  bool success = sender_->Send(message_);
  message_ = nullptr;
  sender_ = nullptr;
  return success;
}

// static
Handle<Event> Event::Create(v8::Isolate* isolate) {
  return mate::CreateHandle(isolate, new Event(isolate));
}

// static
void Event::BuildPrototype(v8::Isolate* isolate,
                           v8::Local<v8::FunctionTemplate> prototype) {
  prototype->SetClassName(mate::StringToV8(isolate, "Event"));
  mate::ObjectTemplateBuilder(isolate, prototype->PrototypeTemplate())
      .SetMethod("preventDefault", &Event::PreventDefault)
      .SetProperty("returnValue", &Event::GetReturnValue,
                   &Event::SetReturnValue);
}

}  // namespace mate