| // Copyright 2017 Google Inc. All Rights Reserved. |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| #include "cobalt/page_visibility/page_visibility_state.h" |
| |
| namespace cobalt { |
| namespace page_visibility { |
| |
| namespace { |
| // Converts an ApplicationState to a VisibilityState. |
| VisibilityState ToVisibilityState(base::ApplicationState state) { |
| switch (state) { |
| case base::kApplicationStatePreloading: |
| return kVisibilityStatePrerender; |
| case base::kApplicationStateStarted: |
| case base::kApplicationStatePaused: |
| return kVisibilityStateVisible; |
| case base::kApplicationStateSuspended: |
| case base::kApplicationStateStopped: |
| return kVisibilityStateHidden; |
| default: |
| NOTREACHED() << "Invalid Application State: " << state; |
| return kVisibilityStateHidden; |
| } |
| } |
| |
| bool HasFocus(base::ApplicationState state) { |
| switch (state) { |
| case base::kApplicationStateStarted: |
| return true; |
| case base::kApplicationStatePreloading: |
| case base::kApplicationStatePaused: |
| case base::kApplicationStateSuspended: |
| case base::kApplicationStateStopped: |
| return false; |
| default: |
| NOTREACHED() << "Invalid Application State: " << state; |
| return false; |
| } |
| } |
| } // namespace |
| |
| PageVisibilityState::PageVisibilityState() |
| : application_state_(base::kApplicationStateStarted) {} |
| |
| PageVisibilityState::PageVisibilityState( |
| base::ApplicationState initial_application_state) |
| : application_state_(initial_application_state) { |
| DCHECK((application_state_ == base::kApplicationStateStarted) || |
| (application_state_ == base::kApplicationStatePreloading)); |
| |
| // TODO: Support Preloading |
| DCHECK_NE(base::kApplicationStatePreloading, application_state_); |
| } |
| |
| bool PageVisibilityState::HasWindowFocus() const { |
| return HasFocus(application_state()); |
| } |
| |
| VisibilityState PageVisibilityState::GetVisibilityState() const { |
| return ToVisibilityState(application_state()); |
| } |
| |
| void PageVisibilityState::SetApplicationState(base::ApplicationState state) { |
| if (application_state_ == state) { |
| DLOG(WARNING) << __FUNCTION__ << ": Attempt to re-enter " |
| << application_state_; |
| return; |
| } |
| |
| // Audit that the transitions are correct. |
| if (DLOG_IS_ON(FATAL)) { |
| switch (application_state_) { |
| case base::kApplicationStatePaused: |
| DCHECK(state == base::kApplicationStateSuspended || |
| state == base::kApplicationStateStarted); |
| break; |
| case base::kApplicationStatePreloading: |
| DCHECK(state == base::kApplicationStateSuspended || |
| state == base::kApplicationStateStarted); |
| case base::kApplicationStateStarted: |
| DCHECK(state == base::kApplicationStatePaused); |
| break; |
| case base::kApplicationStateStopped: |
| DCHECK(state == base::kApplicationStatePreloading || |
| state == base::kApplicationStateStarted); |
| break; |
| case base::kApplicationStateSuspended: |
| DCHECK(state == base::kApplicationStatePaused || |
| state == base::kApplicationStateStopped); |
| break; |
| default: |
| NOTREACHED() << application_state_; |
| break; |
| } |
| } |
| |
| bool old_has_focus = HasFocus(application_state_); |
| VisibilityState old_visibility_state = ToVisibilityState(application_state_); |
| application_state_ = state; |
| bool has_focus = HasFocus(application_state_); |
| VisibilityState visibility_state = ToVisibilityState(application_state_); |
| bool focus_changed = has_focus != old_has_focus; |
| bool visibility_state_changed = visibility_state != old_visibility_state; |
| |
| if (focus_changed && has_focus) { |
| // If going to a focused state, dispatch the visibility state first. |
| if (visibility_state_changed) { |
| DispatchVisibilityStateChanged(visibility_state); |
| } |
| |
| DispatchWindowFocusChanged(has_focus); |
| return; |
| } |
| |
| // Otherwise, we should dispatch the focus state first. |
| if (focus_changed) { |
| DispatchWindowFocusChanged(has_focus); |
| } |
| |
| if (visibility_state_changed) { |
| DispatchVisibilityStateChanged(visibility_state); |
| } |
| } |
| |
| void PageVisibilityState::DispatchWindowFocusChanged(bool has_focus) { |
| FOR_EACH_OBSERVER(Observer, observer_list_, OnWindowFocusChanged(has_focus)); |
| } |
| |
| void PageVisibilityState::DispatchVisibilityStateChanged( |
| VisibilityState visibility_state) { |
| FOR_EACH_OBSERVER(Observer, observer_list_, |
| OnVisibilityStateChanged(visibility_state)); |
| } |
| |
| } // namespace page_visibility |
| } // namespace cobalt |