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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/shared/chrome/browser/tabs/web_state_list_order_controller.h" |
| 6 |
| 7 #include <cstdint> |
| 8 |
| 9 #include "base/logging.h" |
| 10 #import "ios/shared/chrome/browser/tabs/web_state_list.h" |
| 11 |
| 12 WebStateListOrderController::WebStateListOrderController( |
| 13 WebStateList* web_state_list) |
| 14 : web_state_list_(web_state_list) { |
| 15 DCHECK(web_state_list_); |
| 16 } |
| 17 |
| 18 WebStateListOrderController::~WebStateListOrderController() = default; |
| 19 |
| 20 int WebStateListOrderController::DetermineInsertionIndex( |
| 21 ui::PageTransition transition, |
| 22 web::WebState* opener) const { |
| 23 if (!opener) |
| 24 return web_state_list_->count(); |
| 25 |
| 26 if (!PageTransitionCoreTypeIs(transition, ui::PAGE_TRANSITION_LINK)) |
| 27 return web_state_list_->count(); |
| 28 |
| 29 int opener_index = web_state_list_->GetIndexOfWebState(opener); |
| 30 DCHECK_NE(WebStateList::kInvalidIndex, opener_index); |
| 31 |
| 32 int list_child_index = web_state_list_->GetIndexOfLastWebStateOpenedBy( |
| 33 opener, opener_index, true); |
| 34 |
| 35 int reference_index = list_child_index != WebStateList::kInvalidIndex |
| 36 ? list_child_index |
| 37 : opener_index; |
| 38 |
| 39 // Check for overflows (just a DCHECK as INT_MAX open WebState is unlikely). |
| 40 DCHECK_LT(reference_index, INT_MAX); |
| 41 return reference_index + 1; |
| 42 } |
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