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// Copyright 2015 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_UI_WEBUI_SETTINGS_FONT_HANDLER_H_
#define CHROME_BROWSER_UI_WEBUI_SETTINGS_FONT_HANDLER_H_
#include <memory>
#include <string>
#include "base/macros.h"
#include "base/memory/weak_ptr.h"
#include "base/scoped_observer.h"
#include "chrome/browser/ui/webui/settings/settings_page_ui_handler.h"
#include "extensions/browser/extension_registry_observer.h"
namespace base {
class ListValue;
}
namespace content {
class WebUI;
}
namespace extensions {
class Extension;
class ExtensionRegistry;
}
class Profile;
namespace settings {
// Handle OS font list, font preference settings and character encoding.
class FontHandler : public SettingsPageUIHandler,
public extensions::ExtensionRegistryObserver {
public:
explicit FontHandler(content::WebUI* webui);
~FontHandler() override;
// SettingsPageUIHandler implementation.
void RegisterMessages() override;
void OnJavascriptAllowed() override;
void OnJavascriptDisallowed() override;
// ExtensionRegistryObserver implementation.
void OnExtensionLoaded(content::BrowserContext* browser_context,
const extensions::Extension* extension) override;
void OnExtensionUnloaded(
content::BrowserContext* browser_context,
const extensions::Extension* extension,
extensions::UnloadedExtensionInfo::Reason reason) override;
private:
// Handler for script asking for font information.
void HandleFetchFontsData(const base::ListValue* args);
// Listen for changes to whether the advanced font extension is available.
// An initial update will be sent when observation begins.
void HandleObserveAdvancedFontExtensionAvailable(const base::ListValue* args);
// Open the advanced font settings page.
void HandleOpenAdvancedFontSettings(const base::ListValue* args);
// Callback to handle fonts loading.
void FontListHasLoaded(std::string callback_id,
std::unique_ptr<base::ListValue> list);
const extensions::Extension* GetAdvancedFontSettingsExtension();
void NotifyAdvancedFontSettingsAvailability();
ScopedObserver<extensions::ExtensionRegistry,
extensions::ExtensionRegistryObserver>
extension_registry_observer_;
Profile* profile_; // Weak pointer.
base::WeakPtrFactory<FontHandler> weak_ptr_factory_;
DISALLOW_COPY_AND_ASSIGN(FontHandler);
};
} // namespace settings
#endif // CHROME_BROWSER_UI_WEBUI_SETTINGS_FONT_HANDLER_H_