| // 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. |
| |
| #include "third_party/blink/renderer/core/frame/frame_lifecycle.h" |
| |
| #include "base/check_op.h" |
| #include "third_party/blink/renderer/platform/wtf/assertions.h" |
| |
| namespace blink { |
| |
| FrameLifecycle::FrameLifecycle() : state_(kAttached) {} |
| |
| void FrameLifecycle::AdvanceTo(State state) { |
| switch (state) { |
| case kAttached: |
| case kDetached: |
| // Normally, only allow state to move forward. |
| DCHECK_GT(state, state_); |
| break; |
| case kDetaching: |
| // We can go from Detaching to Detaching since the detach() method can be |
| // re-entered. |
| DCHECK_GE(state, state_); |
| break; |
| } |
| state_ = state; |
| } |
| |
| } // namespace blink |
