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| 1 // Copyright 2017 The Chromium Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. |
| 4 |
| 5 #import "ios/chrome/browser/tabs/tab_model_selected_tab_observer.h" |
| 6 |
| 7 #include "base/logging.h" |
| 8 #import "ios/chrome/browser/tabs/legacy_tab_helper.h" |
| 9 #import "ios/chrome/browser/tabs/tab.h" |
| 10 #import "ios/chrome/browser/tabs/tab_model.h" |
| 11 |
| 12 #if !defined(__has_feature) || !__has_feature(objc_arc) |
| 13 #error "This file requires ARC support." |
| 14 #endif |
| 15 |
| 16 @implementation TabModelSelectedTabObserver { |
| 17 __weak TabModel* _tabModel; |
| 18 } |
| 19 |
| 20 - (instancetype)initWithTabModel:(TabModel*)tabModel { |
| 21 DCHECK(tabModel); |
| 22 if ((self = [super init])) { |
| 23 _tabModel = tabModel; |
| 24 } |
| 25 return self; |
| 26 } |
| 27 |
| 28 #pragma mark WebStateListObserving |
| 29 |
| 30 - (void)webStateList:(WebStateList*)webStateList |
| 31 didChangeActiveWebState:(web::WebState*)newWebState |
| 32 oldWebState:(web::WebState*)oldWebState |
| 33 atIndex:(int)atIndex |
| 34 userAction:(BOOL)userAction { |
| 35 Tab* oldTab = nil; |
| 36 Tab* newTab = nil; |
| 37 if (oldWebState) { |
| 38 // Save state, such as scroll position, ... of the old selected Tab. |
| 39 oldTab = LegacyTabHelper::GetTabForWebState(oldWebState); |
| 40 if (userAction) |
| 41 [oldTab recordStateInHistory]; |
| 42 |
| 43 // Avoid artificially extending the lifetime of oldTab until the global |
| 44 // autoreleasepool is purged. |
| 45 @autoreleasepool { |
| 46 [[NSNotificationCenter defaultCenter] |
| 47 postNotificationName:kTabModelTabDeselectedNotification |
| 48 object:@{kTabModelTabKey : oldTab}]; |
| 49 } |
| 50 } |
| 51 |
| 52 if (newWebState) { |
| 53 newTab = LegacyTabHelper::GetTabForWebState(newWebState); |
| 54 [newTab updateLastVisitedTimestamp]; |
| 55 |
| 56 // Persist the session state. |
| 57 if (newTab.loadFinished) |
| 58 [_tabModel saveSessionImmediately:NO]; |
| 59 } |
| 60 } |
| 61 |
| 62 @end |
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