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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.
#ifndef CONTENT_RENDERER_WEB_UI_MOJO_H_
#define CONTENT_RENDERER_WEB_UI_MOJO_H_
#include <string>
#include "content/public/renderer/render_frame_observer.h"
#include "content/public/renderer/render_view_observer.h"
#include "content/public/renderer/render_view_observer_tracker.h"
#include "mojo/public/cpp/system/core.h"
namespace gin {
class PerContextData;
}
namespace content {
class WebUIMojoContextState;
// WebUIMojo is responsible for enabling the renderer side of mojo bindings.
// It creates (and destroys) a WebUIMojoContextState at the appropriate times
// and handles the necessary browser messages. WebUIMojo destroys itself when
// the RendererView it is created with is destroyed.
class WebUIMojo
: public RenderViewObserver,
public RenderViewObserverTracker<WebUIMojo> {
public:
explicit WebUIMojo(RenderView* render_view);
// Sets the handle to the current WebUI.
void SetBrowserHandle(mojo::ScopedMessagePipeHandle handle);
private:
class MainFrameObserver : public RenderFrameObserver {
public:
explicit MainFrameObserver(WebUIMojo* web_ui_mojo);
virtual ~MainFrameObserver();
// RenderFrameObserver overrides:
virtual void WillReleaseScriptContext(v8::Handle<v8::Context> context,
int world_id) OVERRIDE;
virtual void DidFinishDocumentLoad() OVERRIDE;
private:
WebUIMojo* web_ui_mojo_;
DISALLOW_COPY_AND_ASSIGN(MainFrameObserver);
};
virtual ~WebUIMojo();
void CreateContextState();
void DestroyContextState(v8::Handle<v8::Context> context);
// Invoked when the frame finishes loading. Invokes SetHandleOnContextState()
// if necessary.
void OnDidFinishDocumentLoad();
// Invokes SetHandle() on the WebUIMojoContextState (if there is one).
void SetHandleOnContextState(mojo::ScopedMessagePipeHandle handle);
WebUIMojoContextState* GetContextState();
// RenderViewObserver overrides:
virtual void DidClearWindowObject(blink::WebLocalFrame* frame,
int world_id) OVERRIDE;
MainFrameObserver main_frame_observer_;
// Set to true in DidFinishDocumentLoad(). 'main' is only executed once this
// happens.
bool did_finish_document_load_;
// If SetBrowserHandle() is invoked before the document finishes loading the
// MessagePipeHandle is stored here. When the document finishes loading
// SetHandleOnContextState() is invoked to send the handle to the
// WebUIMojoContextState and ultimately the page.
mojo::ScopedMessagePipeHandle pending_handle_;
DISALLOW_COPY_AND_ASSIGN(WebUIMojo);
};
} // namespace content
#endif // CONTENT_RENDERER_WEB_UI_MOJO_H_
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