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// Copyright (c) 2013 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 EXTENSIONS_BROWSER_APP_SORTING_H_
#define EXTENSIONS_BROWSER_APP_SORTING_H_
#include <stddef.h>
#include <string>
#include "base/macros.h"
#include "extensions/common/extension.h"
#include "sync/api/string_ordinal.h"
namespace extensions {
class ExtensionScopedPrefs;
// An interface that provides a fixed ordering for a set of apps.
class AppSorting {
public:
AppSorting() {}
virtual ~AppSorting() {}
// Resolves any conflicts the might be created as a result of syncing that
// results in two icons having the same page and app launch ordinal. After
// this is called it is guaranteed that there are no collisions of NTP icons.
virtual void FixNTPOrdinalCollisions() = 0;
// This ensures that the extension has valid ordinals, and if it doesn't then
// properly initialize them. |suggested_page| will be used if it is valid and
// the extension has no valid user-set page ordinal.
virtual void EnsureValidOrdinals(
const std::string& extension_id,
const syncer::StringOrdinal& suggested_page) = 0;
// Updates the app launcher value for the moved extension so that it is now
// located after the given predecessor and before the successor.
// Empty strings are used to indicate no successor or predecessor.
virtual void OnExtensionMoved(const std::string& moved_extension_id,
const std::string& predecessor_extension_id,
const std::string& successor_extension_id) = 0;
// Get the application launch ordinal for an app with |extension_id|. This
// determines the order in which the app appears on the page it's on in the
// New Tab Page (Note that you can compare app launch ordinals only if the
// apps are on the same page). A string value close to |a*| generally
// indicates top left. If the extension has no launch ordinal, an invalid
// StringOrdinal is returned.
virtual syncer::StringOrdinal GetAppLaunchOrdinal(
const std::string& extension_id) const = 0;
// Sets a specific launch ordinal for an app with |extension_id|.
virtual void SetAppLaunchOrdinal(
const std::string& extension_id,
const syncer::StringOrdinal& new_app_launch_ordinal) = 0;
// Returns a StringOrdinal that is lower than any app launch ordinal for the
// given page.
virtual syncer::StringOrdinal CreateFirstAppLaunchOrdinal(
const syncer::StringOrdinal& page_ordinal) const = 0;
// Returns a StringOrdinal that is higher than any app launch ordinal for the
// given page.
virtual syncer::StringOrdinal CreateNextAppLaunchOrdinal(
const syncer::StringOrdinal& page_ordinal) const = 0;
// Returns a StringOrdinal that is lower than any existing page ordinal.
virtual syncer::StringOrdinal CreateFirstAppPageOrdinal() const = 0;
// Gets the page a new app should install to, which is the earliest non-full
// page. The returned ordinal may correspond to a page that doesn't yet exist
// if all pages are full.
virtual syncer::StringOrdinal GetNaturalAppPageOrdinal() const = 0;
// Get the page ordinal for an app with |extension_id|. This determines
// which page an app will appear on in page-based NTPs. If the app has no
// page specified, an invalid StringOrdinal is returned.
virtual syncer::StringOrdinal GetPageOrdinal(
const std::string& extension_id) const = 0;
// Sets a specific page ordinal for an app with |extension_id|.
virtual void SetPageOrdinal(
const std::string& extension_id,
const syncer::StringOrdinal& new_page_ordinal) = 0;
// Removes the ordinal values for an app.
virtual void ClearOrdinals(const std::string& extension_id) = 0;
// Convert the page StringOrdinal value to its integer equivalent. This takes
// O(# of apps) worst-case.
virtual int PageStringOrdinalAsInteger(
const syncer::StringOrdinal& page_ordinal) const = 0;
// Converts the page index integer to its StringOrdinal equivalent. This takes
// O(# of apps) worst-case.
virtual syncer::StringOrdinal PageIntegerAsStringOrdinal(
size_t page_index) = 0;
// Hides an extension from the new tab page, or makes a previously hidden
// extension visible.
virtual void SetExtensionVisible(const std::string& extension_id,
bool visible) = 0;
private:
DISALLOW_COPY_AND_ASSIGN(AppSorting);
};
} // namespace extensions
#endif // EXTENSIONS_BROWSER_APP_SORTING_H_
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