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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_SESSIONS_SESSION_TAB_HELPER_H_
#define CHROME_BROWSER_SESSIONS_SESSION_TAB_HELPER_H_
#include "base/macros.h"
#include "components/sessions/core/session_id.h"
#include "content/public/browser/web_contents_observer.h"
#include "content/public/browser/web_contents_user_data.h"
// This class keeps the extension API's windowID up-to-date with the current
// window of the tab.
class SessionTabHelper : public content::WebContentsObserver,
public content::WebContentsUserData<SessionTabHelper> {
public:
~SessionTabHelper() override;
// Returns the identifier used by session restore for this tab.
const SessionID& session_id() const { return session_id_; }
// Identifier of the window the tab is in.
void SetWindowID(const SessionID& id);
const SessionID& window_id() const { return window_id_; }
// If the specified WebContents has a SessionTabHelper (probably because it
// was used as the contents of a tab), returns a tab id. This value is
// immutable for a given tab. It will be unique across Chrome within the
// current session, but may be re-used across sessions. Returns -1
// for a NULL WebContents or if the WebContents has no SessionTabHelper.
static SessionID::id_type IdForTab(const content::WebContents* tab);
// If the specified WebContents has a SessionTabHelper (probably because it
// was used as the contents of a tab), and has ever been attached to a Browser
// window, returns Browser::session_id().id() for that Browser. If the tab is
// being dragged between Browser windows, returns the old window's id value.
// If the WebContents has a SessionTabHelper but has never been attached to a
// Browser window, returns an id value that is different from that of any
// Browser. Returns -1 for a NULL WebContents or if the WebContents has no
// SessionTabHelper.
static SessionID::id_type IdForWindowContainingTab(
const content::WebContents* tab);
// content::WebContentsObserver:
void UserAgentOverrideSet(const std::string& user_agent) override;
private:
explicit SessionTabHelper(content::WebContents* contents);
friend class content::WebContentsUserData<SessionTabHelper>;
// Unique identifier of the tab for session restore. This id is only unique
// within the current session, and is not guaranteed to be unique across
// sessions.
const SessionID session_id_;
// Unique identifier of the window the tab is in.
SessionID window_id_;
DISALLOW_COPY_AND_ASSIGN(SessionTabHelper);
};
#endif // CHROME_BROWSER_SESSIONS_SESSION_TAB_HELPER_H_
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