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// Copyright 2014 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.
#include "content/renderer/web_ui_mojo.h"
#include "content/common/view_messages.h"
#include "content/public/renderer/render_frame.h"
#include "content/public/renderer/render_view.h"
#include "content/renderer/web_ui_mojo_context_state.h"
#include "gin/per_context_data.h"
#include "third_party/WebKit/public/web/WebFrame.h"
#include "third_party/WebKit/public/web/WebKit.h"
#include "third_party/WebKit/public/web/WebView.h"
#include "v8/include/v8.h"
namespace content {
namespace {
const char kWebUIMojoContextStateKey[] = "WebUIMojoContextState";
struct WebUIMojoContextStateData : public base::SupportsUserData::Data {
scoped_ptr<WebUIMojoContextState> state;
};
} // namespace
WebUIMojo::MainFrameObserver::MainFrameObserver(WebUIMojo* web_ui_mojo)
: RenderFrameObserver(RenderFrame::FromWebFrame(
web_ui_mojo->render_view()->GetWebView()->mainFrame())),
web_ui_mojo_(web_ui_mojo) {
}
WebUIMojo::MainFrameObserver::~MainFrameObserver() {
}
void WebUIMojo::MainFrameObserver::WillReleaseScriptContext(
v8::Handle<v8::Context> context,
int world_id) {
web_ui_mojo_->DestroyContextState(context);
}
void WebUIMojo::MainFrameObserver::DidFinishDocumentLoad() {
web_ui_mojo_->OnDidFinishDocumentLoad();
}
WebUIMojo::WebUIMojo(RenderView* render_view)
: RenderViewObserver(render_view),
RenderViewObserverTracker<WebUIMojo>(render_view),
main_frame_observer_(this),
did_finish_document_load_(false) {
CreateContextState();
}
void WebUIMojo::SetBrowserHandle(mojo::ScopedMessagePipeHandle handle) {
if (did_finish_document_load_)
SetHandleOnContextState(handle.Pass());
else
pending_handle_ = handle.Pass();
}
WebUIMojo::~WebUIMojo() {
}
void WebUIMojo::CreateContextState() {
v8::HandleScope handle_scope(blink::mainThreadIsolate());
blink::WebFrame* frame = render_view()->GetWebView()->mainFrame();
v8::Handle<v8::Context> context = frame->mainWorldScriptContext();
gin::PerContextData* context_data = gin::PerContextData::From(context);
WebUIMojoContextStateData* data = new WebUIMojoContextStateData;
data->state.reset(new WebUIMojoContextState(
render_view()->GetWebView()->mainFrame(), context));
context_data->SetUserData(kWebUIMojoContextStateKey, data);
}
void WebUIMojo::DestroyContextState(v8::Handle<v8::Context> context) {
gin::PerContextData* context_data = gin::PerContextData::From(context);
if (!context_data)
return;
context_data->RemoveUserData(kWebUIMojoContextStateKey);
}
void WebUIMojo::OnDidFinishDocumentLoad() {
did_finish_document_load_ = true;
if (pending_handle_.is_valid())
SetHandleOnContextState(pending_handle_.Pass());
}
void WebUIMojo::SetHandleOnContextState(mojo::ScopedMessagePipeHandle handle) {
DCHECK(did_finish_document_load_);
v8::HandleScope handle_scope(blink::mainThreadIsolate());
WebUIMojoContextState* state = GetContextState();
if (state)
state->SetHandle(handle.Pass());
}
WebUIMojoContextState* WebUIMojo::GetContextState() {
blink::WebFrame* frame = render_view()->GetWebView()->mainFrame();
v8::HandleScope handle_scope(blink::mainThreadIsolate());
v8::Handle<v8::Context> context = frame->mainWorldScriptContext();
gin::PerContextData* context_data = gin::PerContextData::From(context);
if (!context_data)
return NULL;
WebUIMojoContextStateData* context_state =
static_cast<WebUIMojoContextStateData*>(
context_data->GetUserData(kWebUIMojoContextStateKey));
return context_state ? context_state->state.get() : NULL;
}
void WebUIMojo::DidClearWindowObject(blink::WebFrame* frame, int world_id) {
if (frame != render_view()->GetWebView()->mainFrame())
return;
// NOTE: this function may be called early on twice. From the constructor
// mainWorldScriptContext() may trigger this to be called. If we are created
// before the page is loaded (which is very likely), then on first load this
// is called. In the case of the latter we may have already supplied the
// handle to the context state so that if we destroy now the handle is
// lost. If this is the result of the first load then the contextstate should
// be empty and we don't need to destroy it.
WebUIMojoContextState* state = GetContextState();
if (state && !state->module_added())
return;
v8::HandleScope handle_scope(blink::mainThreadIsolate());
DestroyContextState(frame->mainWorldScriptContext());
CreateContextState();
}
} // namespace content
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