ios/chrome/browser/snapshots/snapshot_cache_web_state_list_observer.h

// Copyright 2017 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 IOS_CHROME_BROWSER_SNAPSHOTS_SNAPSHOT_CACHE_WEB_STATE_LIST_OBSERVER_H_
#define IOS_CHROME_BROWSER_SNAPSHOTS_SNAPSHOT_CACHE_WEB_STATE_LIST_OBSERVER_H_

#include "base/macros.h"
#import "ios/chrome/browser/web_state_list/web_state_list_observer.h"

@class SnapshotCache;

// Updates the SnapshotCache when the active Tab changes.
class SnapshotCacheWebStateListObserver : public WebStateListObserver {
 public:
  explicit SnapshotCacheWebStateListObserver(SnapshotCache* snapshot_cache);
  ~SnapshotCacheWebStateListObserver() override;

 private:
  // WebStateListObserver implementation.
  void WebStateActivatedAt(WebStateList* web_state_list,
                           web::WebState* old_web_state,
                           web::WebState* new_web_state,
                           int active_index,
                           int reason) override;

  SnapshotCache* snapshot_cache_;

  DISALLOW_COPY_AND_ASSIGN(SnapshotCacheWebStateListObserver);
};

#endif  // IOS_CHROME_BROWSER_SNAPSHOTS_SNAPSHOT_CACHE_WEB_STATE_LIST_OBSERVER_H_