extensions/renderer/render_view_observer_natives.cc

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "extensions/renderer/render_view_observer_natives.h"
   6
   7 #include "content/public/renderer/render_view.h"
   8 #include "content/public/renderer/render_view_observer.h"
   9 #include "extensions/common/extension_api.h"
  10 #include "extensions/renderer/script_context.h"
  11 #include "third_party/WebKit/public/web/WebFrame.h"
  12 #include "third_party/WebKit/public/web/WebScopedMicrotaskSuppression.h"
  13
  14 namespace extensions {
  15
  16 namespace {
  17
  18 // Deletes itself when done.
  19 class LoadWatcher : public content::RenderViewObserver {
  20  public:
  21   LoadWatcher(ScriptContext* context,
  22               content::RenderView* view,
  23               v8::Handle<v8::Function> cb)
  24       : content::RenderViewObserver(view),
  25         context_(context),
  26         callback_(context->isolate(), cb) {}
  27
  28   void DidCreateDocumentElement(blink::WebLocalFrame* frame) override {
  29     CallbackAndDie(true);
  30   }
  31
  32   void DidFailProvisionalLoad(blink::WebLocalFrame* frame,
  33                               const blink::WebURLError& error) override {
  34     CallbackAndDie(false);
  35   }
  36
  37  private:
  38   void CallbackAndDie(bool succeeded) {
  39     v8::Isolate* isolate = context_->isolate();
  40     v8::HandleScope handle_scope(isolate);
  41     v8::Handle<v8::Value> args[] = {v8::Boolean::New(isolate, succeeded)};
  42     context_->CallFunction(v8::Local<v8::Function>::New(isolate, callback_),
  43                            arraysize(args), args);
  44     delete this;
  45   }
  46
  47   ScriptContext* context_;
  48   v8::Global<v8::Function> callback_;
  49   DISALLOW_COPY_AND_ASSIGN(LoadWatcher);
  50 };
  51 }  // namespace
  52
  53 RenderViewObserverNatives::RenderViewObserverNatives(ScriptContext* context)
  54     : ObjectBackedNativeHandler(context) {
  55   RouteFunction("OnDocumentElementCreated",
  56                 base::Bind(&RenderViewObserverNatives::OnDocumentElementCreated,
  57                            base::Unretained(this)));
  58 }
  59
  60 void RenderViewObserverNatives::OnDocumentElementCreated(
  61     const v8::FunctionCallbackInfo<v8::Value>& args) {
  62   CHECK(args.Length() == 2);
  63   CHECK(args[0]->IsInt32());
  64   CHECK(args[1]->IsFunction());
  65
  66   int view_id = args[0]->Int32Value();
  67
  68   content::RenderView* view = content::RenderView::FromRoutingID(view_id);
  69   if (!view) {
  70     LOG(WARNING) << "No render view found to register LoadWatcher.";
  71     return;
  72   }
  73
  74   new LoadWatcher(context(), view, args[1].As<v8::Function>());
  75
  76   args.GetReturnValue().Set(true);
  77 }
  78
  79 }  // namespace extensions