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// Copyright 2016 The Chromium Authors
// 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 <string_view>
#include <vector>
#include "base/functional/callback_forward.h"
#include "base/values.h"
#include "components/ntp_tiles/tile_source.h"
class PrefService;
namespace ntp_tiles {
class MostVisitedSites;
// Implemented by embedders to hook up NTPTilesInternalsMessageHandler.
class NTPTilesInternalsMessageHandlerClient {
public:
NTPTilesInternalsMessageHandlerClient(
const NTPTilesInternalsMessageHandlerClient&) = delete;
NTPTilesInternalsMessageHandlerClient& operator=(
const NTPTilesInternalsMessageHandlerClient&) = delete;
// 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;
// Creates a new MostVisitedSites based on the context pf the WebUI page.
virtual std::unique_ptr<ntp_tiles::MostVisitedSites>
MakeMostVisitedSites() = 0;
// Registers a callback in Javascript. See content::WebUI and web::WebUIIOS.
virtual void RegisterMessageCallback(
std::string_view message,
base::RepeatingCallback<void(const base::Value::List&)> callback) = 0;
// Invokes a function in Javascript. See content::WebUI and web::WebUIIOS.
virtual void CallJavascriptFunctionSpan(
std::string_view name,
base::span<const base::ValueView> values) = 0;
// Convenience function for CallJavascriptFunctionSpan().
template <typename... Arg>
void CallJavascriptFunction(std::string_view name, const Arg&... arg) {
base::ValueView args[] = {arg...};
CallJavascriptFunctionSpan(name, args);
}
protected:
NTPTilesInternalsMessageHandlerClient();
virtual ~NTPTilesInternalsMessageHandlerClient();
};
} // namespace ntp_tiles
#endif // COMPONENTS_NTP_TILES_WEBUI_NTP_TILES_INTERNALS_MESSAGE_HANDLER_CLIENT_H_
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