Index: ios/chrome/browser/snapshots/snapshot_cache_web_state_list_observer.h |
diff --git a/ios/chrome/browser/snapshots/snapshot_cache_web_state_list_observer.h b/ios/chrome/browser/snapshots/snapshot_cache_web_state_list_observer.h |
new file mode 100644 |
index 0000000000000000000000000000000000000000..a6e306eaad4496d5ff0afbd9f530742d1d7fc20b |
--- /dev/null |
+++ b/ios/chrome/browser/snapshots/snapshot_cache_web_state_list_observer.h |
@@ -0,0 +1,32 @@ |
+// 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/shared/chrome/browser/tabs/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, |
+ bool user_action) override; |
+ |
+ SnapshotCache* snapshot_cache_; |
+ |
+ DISALLOW_COPY_AND_ASSIGN(SnapshotCacheWebStateListObserver); |
+}; |
+ |
+#endif // IOS_CHROME_BROWSER_SNAPSHOTS_SNAPSHOT_CACHE_WEB_STATE_LIST_OBSERVER_H_ |