| // Copyright 2021 The Chromium OS Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef ARC_DATA_SNAPSHOTD_ESC_KEY_WATCHER_H_ |
| #define ARC_DATA_SNAPSHOTD_ESC_KEY_WATCHER_H_ |
| |
| #include <memory> |
| #include <vector> |
| |
| #include <linux/input.h> |
| |
| #include <base/files/file_descriptor_watcher_posix.h> |
| #include <base/files/scoped_file.h> |
| |
| namespace arc { |
| namespace data_snapshotd { |
| |
| // This class watches for ESC key presses and notifies its Delegate. |
| // TODO(pbond): fix to be using KeyReader library once available. |
| class EscKeyWatcher { |
| public: |
| class Delegate { |
| public: |
| virtual ~Delegate() = default; |
| // This method is called when ESC key is pressed by user. It means the |
| // ongoing flow must be cancelled. |
| virtual void SendCancelSignal() = 0; |
| }; |
| |
| explicit EscKeyWatcher(Delegate* delegate); |
| EscKeyWatcher(const EscKeyWatcher&) = delete; |
| EscKeyWatcher& operator=(const EscKeyWatcher&) = delete; |
| virtual ~EscKeyWatcher(); |
| |
| // Initializes the |epfd_| and sets the callback. Listens for input ESC key |
| // presses. Returns false on error. |
| bool Init(); |
| // Get epoll event using GetEpEvent. If the event is an ESC key event, it |
| // calls the Delegate::SendCancelSignal function to cancel the flow. |
| void OnKeyEvent(); |
| |
| private: |
| // These methods are made virtual for partial testing. |
| // Creates the epoll and gets event data. Sets epoll file descriptor and on |
| // returns true on success. |
| virtual bool EpollCreate(base::ScopedFD* epfd); |
| // Checks all the valid files under kDevInputEvent, stores the valid |
| // keyboard devices to |fds_|. |
| // Returns false if there are no available file descriptors. |
| virtual bool GetValidFds(); |
| // Waits for a valid key event and reads it into the input event struct. Sets |
| // fd index and returns true on success. |
| virtual bool GetEpEvent(int epfd, struct input_event* ev, int* index); |
| |
| Delegate* delegate_; |
| |
| // Stores open event connections. |
| std::vector<base::ScopedFD> fds_; |
| // Stores epoll file descriptor. |
| base::ScopedFD epfd_; |
| |
| // Watches the epoll file descriptor and calls OnKeyEvent. |
| std::unique_ptr<base::FileDescriptorWatcher::Controller> watcher_; |
| }; |
| |
| } // namespace data_snapshotd |
| } // namespace arc |
| |
| #endif // ARC_DATA_SNAPSHOTD_ESC_KEY_WATCHER_H_ |