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// Copyright (c) 2011 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 CHROME_BROWSER_TAB_CONTENTS_SPELLING_MENU_OBSERVER_H_
#define CHROME_BROWSER_TAB_CONTENTS_SPELLING_MENU_OBSERVER_H_
#pragma once
#include <string>
#include <vector>
#include "base/memory/scoped_ptr.h"
#include "base/string16.h"
#include "base/timer.h"
#include "chrome/browser/tab_contents/render_view_context_menu_observer.h"
#include "content/public/common/url_fetcher_delegate.h"
class RenderViewContextMenuProxy;
namespace net {
class URLRequestContextGetter;
}
// An observer that listens to events from the RenderViewContextMenu class and
// shows suggestions from the Spelling ("do you mean") service to a context menu
// while we show it. This class implements two interfaces:
// * RenderViewContextMenuObserver
// This interface is used for adding a menu item and update it while showing.
// * content::URLFetcherDelegate
// This interface is used for sending a JSON_RPC request to the Spelling
// service and retrieving its response.
// These interfaces allow this class to make a JSON-RPC call to the Spelling
// service in the background and update the context menu while showing. The
// following snippet describes how to add this class to the observer list of the
// RenderViewContextMenu class.
//
// void RenderViewContextMenu::InitMenu() {
// spelling_menu_observer_.reset(new SpellingMenuObserver(this));
// if (spelling_menu_observer_.get())
// observers_.AddObserver(spelling_menu_observer.get());
// }
//
class SpellingMenuObserver : public RenderViewContextMenuObserver,
public content::URLFetcherDelegate {
public:
explicit SpellingMenuObserver(RenderViewContextMenuProxy* proxy);
virtual ~SpellingMenuObserver();
// RenderViewContextMenuObserver implementation.
virtual void InitMenu(const ContextMenuParams& params) OVERRIDE;
virtual bool IsCommandIdSupported(int command_id) OVERRIDE;
virtual bool IsCommandIdEnabled(int command_id) OVERRIDE;
virtual void ExecuteCommand(int command_id) OVERRIDE;
// content::URLFetcherDelegate implementation.
virtual void OnURLFetchComplete(const content::URLFetcher* source) OVERRIDE;
private:
// Invokes a JSON-RPC call in the background. This function sends a JSON-RPC
// request to the Spelling service. Chrome will call OnURLFetchComplete() when
// it receives a response from the service.
bool Invoke(const string16& text,
const std::string& locale,
net::URLRequestContextGetter* context);
// Parses the specified response from the Spelling service.
bool ParseResponse(int code, const std::string& data);
// The callback function for base::RepeatingTimer<SpellingMenuClient>. This
// function updates the "loading..." animation in the context-menu item.
void OnAnimationTimerExpired();
// The interface to add a context-menu item and update it. This class uses
// this interface to avoid accesing context-menu items directly.
RenderViewContextMenuProxy* proxy_;
// Suggested words from the local spellchecker. If the spelling service
// returns a word in this list, we hide the context-menu item to prevent
// showing the same word twice.
std::vector<string16> suggestions_;
// The string used for animation until we receive a response from the Spelling
// service. The current animation just adds periods at the end of this string:
// 'Loading' -> 'Loading.' -> 'Loading..' -> 'Loading...' (-> 'Loading')
string16 loading_message_;
int loading_frame_;
// A flag represending whether this call finished successfully. This means we
// receive an empty JSON string or a JSON string that consists of misspelled
// words. ('spelling_menu_observer.cc' describes its format.)
bool succeeded_;
// The string representing the result of this call. This string is a
// suggestion when this call finished successfully. Otherwise it is error
// text. Until we receive a response from the Spelling service, this string
// stores the input string. (Since the Spelling service sends only misspelled
// words, we replace these misspelled words in the input text with the
// suggested words to create suggestion text.
string16 result_;
// The URLFetcher object used for sending a JSON-RPC request.
scoped_ptr<content::URLFetcher> fetcher_;
// A timer used for loading animation.
base::RepeatingTimer<SpellingMenuObserver> animation_timer_;
DISALLOW_COPY_AND_ASSIGN(SpellingMenuObserver);
};
#endif // CHROME_BROWSER_TAB_CONTENTS_SPELLING_MENU_OBSERVER_H_
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