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), context_(context), callback_(cb) {}
  25
  26   void DidCreateDocumentElement(blink::WebLocalFrame* frame) override {
  27     CallbackAndDie(true);
  28   }
  29
  30   void DidFailProvisionalLoad(blink::WebLocalFrame* frame,
  31                               const blink::WebURLError& error) override {
  32     CallbackAndDie(false);
  33   }
  34
  35  private:
  36   void CallbackAndDie(bool succeeded) {
  37     v8::Isolate* isolate = context_->isolate();
  38     v8::HandleScope handle_scope(isolate);
  39     v8::Handle<v8::Value> args[] = {v8::Boolean::New(isolate, succeeded)};
  40     context_->CallFunction(callback_.NewHandle(isolate), 1, args);
  41     delete this;
  42   }
  43
  44   ScriptContext* context_;
  45   ScopedPersistent<v8::Function> callback_;
  46   DISALLOW_COPY_AND_ASSIGN(LoadWatcher);
  47 };
  48 }  // namespace
  49
  50 RenderViewObserverNatives::RenderViewObserverNatives(ScriptContext* context)
  51     : ObjectBackedNativeHandler(context) {
  52   RouteFunction("OnDocumentElementCreated",
  53                 base::Bind(&RenderViewObserverNatives::OnDocumentElementCreated,
  54                            base::Unretained(this)));
  55 }
  56
  57 void RenderViewObserverNatives::OnDocumentElementCreated(
  58     const v8::FunctionCallbackInfo<v8::Value>& args) {
  59   CHECK(args.Length() == 2);
  60   CHECK(args[0]->IsInt32());
  61   CHECK(args[1]->IsFunction());
  62
  63   int view_id = args[0]->Int32Value();
  64
  65   content::RenderView* view = content::RenderView::FromRoutingID(view_id);
  66   if (!view) {
  67     LOG(WARNING) << "No render view found to register LoadWatcher.";
  68     return;
  69   }
  70
  71   new LoadWatcher(context(), view, args[1].As<v8::Function>());
  72
  73   args.GetReturnValue().Set(true);
  74 }
  75
  76 }  // namespace extensions