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// Copyright 2016 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 COMPONENTS_NTP_TILES_WEBUI_NTP_TILES_INTERNALS_MESSAGE_HANDLER_CLIENT_H_
#define COMPONENTS_NTP_TILES_WEBUI_NTP_TILES_INTERNALS_MESSAGE_HANDLER_CLIENT_H_
#include <memory>
#include <string>
#include <vector>
#include "base/callback_forward.h"
#include "base/macros.h"
#include "components/ntp_tiles/ntp_tile_source.h"
class PrefService;
namespace base {
class Value;
class ListValue;
} // namespace base
namespace ntp_tiles {
class MostVisitedSites;
class PopularSites;
// Implemented by embedders to hook up NTPTilesInternalsMessageHandler.
class NTPTilesInternalsMessageHandlerClient {
public:
// Returns the PrefService for the embedder and containing WebUI page.
virtual PrefService* GetPrefs() = 0;
// False if in a browser mode (e.g. incognito) where tiles aren't supported.
virtual bool SupportsNTPTiles() = 0;
// Returns true if the given source is enabled (even if, in practice, none of
// the tiles would come from it).
virtual bool DoesSourceExist(NTPTileSource source) = 0;
// Creates a new MostVisitedSites based on the context pf the WebUI page.
virtual std::unique_ptr<ntp_tiles::MostVisitedSites>
MakeMostVisitedSites() = 0;
// Creates a new PopularSites based on the context pf the WebUI page.
virtual std::unique_ptr<ntp_tiles::PopularSites> MakePopularSites() = 0;
// Registers a callback in Javascript. See content::WebUI and web::WebUIIOS.
virtual void RegisterMessageCallback(
const std::string& message,
const base::Callback<void(const base::ListValue*)>& callback) = 0;
// Invokes a function in Javascript. See content::WebUI and web::WebUIIOS.
virtual void CallJavascriptFunctionVector(
const std::string& name,
const std::vector<const base::Value*>& values) = 0;
// Convenience function for CallJavascriptFunctionVector().
template <typename... Arg>
void CallJavascriptFunction(const std::string& name, const Arg&... arg) {
CallJavascriptFunctionVector(name, {&arg...});
}
protected:
NTPTilesInternalsMessageHandlerClient();
virtual ~NTPTilesInternalsMessageHandlerClient();
private:
DISALLOW_COPY_AND_ASSIGN(NTPTilesInternalsMessageHandlerClient);
};
} // namespace ntp_tiles
#endif // COMPONENTS_NTP_TILES_WEBUI_NTP_TILES_INTERNALS_MESSAGE_HANDLER_CLIENT_H_
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