// Copyright 2023 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef IOS_CHROME_BROWSER_WEB_MODEL_WEB_STATE_UPDATE_BROWSER_AGENT_H_
#define IOS_CHROME_BROWSER_WEB_MODEL_WEB_STATE_UPDATE_BROWSER_AGENT_H_
#import "base/memory/raw_ptr.h"
#include "base/scoped_multi_source_observation.h"
#include "base/scoped_observation.h"
#include "ios/chrome/browser/shared/model/browser/browser_user_data.h"
#include "ios/chrome/browser/shared/model/web_state_list/web_state_list.h"
#include "ios/chrome/browser/shared/model/web_state_list/web_state_list_observer.h"
#include "ios/web/public/web_state_delegate.h"
#include "ios/web/public/web_state_observer.h"
// This browser agent monitors the browser's web states (when they become or
// stop being active) and manages web state lifecycle updates.
class WebStateUpdateBrowserAgent
: public BrowserUserData<WebStateUpdateBrowserAgent>,
public WebStateListObserver,
public web::WebStateObserver {
public:
~WebStateUpdateBrowserAgent() override;
// Not copyable or assignable.
WebStateUpdateBrowserAgent(const WebStateUpdateBrowserAgent&) = delete;
WebStateUpdateBrowserAgent& operator=(const WebStateUpdateBrowserAgent&) =
delete;
// Translates all web states' offset so web states from other tabs are also
// updated.
void UpdateWebStateScrollViewOffset(CGFloat toolbar_height);
private:
friend class BrowserUserData<WebStateUpdateBrowserAgent>;
BROWSER_USER_DATA_KEY_DECL();
explicit WebStateUpdateBrowserAgent(Browser* browser);
// WebStateListObserver.
void WebStateListDidChange(WebStateList* web_state_list,
const WebStateListChange& change,
const WebStateListStatus& status) override;
void WebStateListDestroyed(WebStateList* web_state_list) override;
raw_ptr<WebStateList> web_state_list_ = nullptr;
// Scoped observations of Browser, WebStateList and WebStates.
base::ScopedObservation<WebStateList, WebStateListObserver>
web_state_list_observation_{this};
base::ScopedMultiSourceObservation<web::WebState, web::WebStateObserver>
web_state_observations_{this};
};
#endif // IOS_CHROME_BROWSER_WEB_MODEL_WEB_STATE_UPDATE_BROWSER_AGENT_H_