| // Copyright 2015 The Cobalt Authors. 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/input/key_repeat_filter.h" |
| |
| #include "cobalt/base/token.h" |
| #include "cobalt/base/tokens.h" |
| |
| namespace cobalt { |
| namespace input { |
| |
| namespace { |
| |
| const base::TimeDelta kRepeatInitialDelay = |
| base::TimeDelta::FromMilliseconds(500); |
| const float kRepeatRateInHertz = 20.0f; |
| const base::TimeDelta kRepeatRate = base::TimeDelta::FromMilliseconds( |
| base::Time::kMillisecondsPerSecond / kRepeatRateInHertz); |
| |
| } // namespace |
| |
| KeyRepeatFilter::KeyRepeatFilter(const KeyboardEventCallback& callback) |
| : KeyEventHandler(callback) {} |
| |
| KeyRepeatFilter::KeyRepeatFilter(KeyEventHandler* filter) |
| : KeyEventHandler(filter) {} |
| |
| void KeyRepeatFilter::HandleKeyboardEvent( |
| base::Token type, const dom::KeyboardEventInit& keyboard_event) { |
| if (type == base::Tokens::keydown()) { |
| HandleKeyDown(type, keyboard_event); |
| } |
| |
| if (type == base::Tokens::keyup()) { |
| HandleKeyUp(type, keyboard_event); |
| } |
| } |
| |
| void KeyRepeatFilter::HandleKeyDown( |
| base::Token type, const dom::KeyboardEventInit& keyboard_event) { |
| // Record the information of the KeyboardEvent for firing repeat events. |
| last_event_data_ = keyboard_event; |
| |
| DispatchKeyboardEvent(type, keyboard_event); |
| |
| // This key down event is triggered for the first time, so start the timer |
| // with |kRepeatInitialDelay|. |
| key_repeat_timer_.Start(FROM_HERE, kRepeatInitialDelay, this, |
| &KeyRepeatFilter::FireKeyRepeatEvent); |
| } |
| |
| void KeyRepeatFilter::HandleKeyUp( |
| base::Token type, const dom::KeyboardEventInit& keyboard_event) { |
| DispatchKeyboardEvent(type, keyboard_event); |
| |
| // If it is a key up event and it matches the previous one, stop the key |
| // repeat timer. |
| if (last_event_data_->key_code() == keyboard_event.key_code()) { |
| key_repeat_timer_.Stop(); |
| } |
| } |
| |
| void KeyRepeatFilter::FireKeyRepeatEvent() { |
| dom::KeyboardEventInit repeat_event(*last_event_data_); |
| repeat_event.set_repeat(true); |
| |
| DispatchKeyboardEvent(base::Tokens::keydown(), repeat_event); |
| |
| // If |FireKeyRepeatEvent| is triggered for the first time then reset the |
| // timer to the repeat rate instead of the initial delay. |
| if (key_repeat_timer_.GetCurrentDelay() == kRepeatInitialDelay) { |
| key_repeat_timer_.Stop(); |
| key_repeat_timer_.Start(FROM_HERE, kRepeatRate, this, |
| &KeyRepeatFilter::FireKeyRepeatEvent); |
| } |
| } |
| |
| } // namespace input |
| } // namespace cobalt |