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* Copyright (C) 2011 The Android Open Source Project
* 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
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* See the License for the specific language governing permissions and
* limitations under the License.
#include <linux/input.h> // KEY_MAX
#include <atomic>
#include <condition_variable>
#include <functional>
#include <mutex>
#include <string>
#include <thread>
#include <vector>
// Abstract class for controlling the user interface during recovery.
class RecoveryUI {
enum Icon {
enum ProgressType {
enum KeyAction {
virtual ~RecoveryUI();
// Initializes the object; called before anything else. UI texts will be initialized according to
// the given locale. Returns true on success.
virtual bool Init(const std::string& locale);
virtual std::string GetLocale() const = 0;
// Shows a stage indicator. Called immediately after Init().
virtual void SetStage(int current, int max) = 0;
// Sets the overall recovery state ("background image").
virtual void SetBackground(Icon icon) = 0;
virtual void SetSystemUpdateText(bool security_update) = 0;
// --- progress indicator ---
virtual void SetProgressType(ProgressType determinate) = 0;
// Shows a progress bar and define the scope of the next operation:
// portion - fraction of the progress bar the next operation will use
// seconds - expected time interval (progress bar moves at this minimum rate)
virtual void ShowProgress(float portion, float seconds) = 0;
// Sets progress bar position (0.0 - 1.0 within the scope defined by the last call to
// ShowProgress).
virtual void SetProgress(float fraction) = 0;
// --- text log ---
virtual void ShowText(bool visible) = 0;
virtual bool IsTextVisible() = 0;
virtual bool WasTextEverVisible() = 0;
// Writes a message to the on-screen log (shown if the user has toggled on the text display).
// Print() will also dump the message to stdout / log file, while PrintOnScreenOnly() not.
virtual void Print(const char* fmt, ...) __printflike(2, 3) = 0;
virtual void PrintOnScreenOnly(const char* fmt, ...) __printflike(2, 3) = 0;
// Shows the contents of the given file. Caller ensures the patition that contains the file has
// been mounted.
virtual void ShowFile(const std::string& filename) = 0;
// --- key handling ---
// Waits for a key and return it. May return -1 after timeout.
virtual int WaitKey();
virtual bool IsKeyPressed(int key);
virtual bool IsLongPress();
// Returns true if you have the volume up/down and power trio typical of phones and tablets, false
// otherwise.
virtual bool HasThreeButtons();
// Returns true if it has a power key.
virtual bool HasPowerKey() const;
// Returns true if it supports touch inputs.
virtual bool HasTouchScreen() const;
// Erases any queued-up keys.
virtual void FlushKeys();
// Called on each key press, even while operations are in progress. Return value indicates whether
// an immediate operation should be triggered (toggling the display, rebooting the device), or if
// the key should be enqueued for use by the main thread.
virtual KeyAction CheckKey(int key, bool is_long_press);
// Called when a key is held down long enough to have been a long-press (but before the key is
// released). This means that if the key is eventually registered (released without any other keys
// being pressed in the meantime), CheckKey will be called with 'is_long_press' true.
virtual void KeyLongPress(int key);
// Normally in recovery there's a key sequence that triggers immediate reboot of the device,
// regardless of what recovery is doing (with the default CheckKey implementation, it's pressing
// the power button 7 times in row). Call this to enable or disable that feature. It is enabled by
// default.
virtual void SetEnableReboot(bool enabled);
// --- menu display ---
virtual void SetTitle(const std::vector<std::string>& lines) = 0;
// Displays a menu with the given 'headers' and 'items'. The supplied 'key_handler' callback,
// which is typically bound to Device::HandleMenuKey(), should return the expected action for the
// given key code and menu visibility (e.g. to move the cursor or to select an item). Caller sets
// 'menu_only' to true to ensure only a menu item gets selected and returned. Otherwise if
// 'menu_only' is false, ShowMenu() will forward any non-negative value returned from the
// key_handler, which may be beyond the range of menu items. This could be used to trigger a
// device-specific action, even without that being listed in the menu. Caller needs to handle
// such a case accordingly (e.g. by calling Device::InvokeMenuItem() to process the action).
// Returns a non-negative value (the chosen item number or device-specific action code), or
// static_cast<size_t>(-1) if timed out waiting for input.
virtual size_t ShowMenu(const std::vector<std::string>& headers,
const std::vector<std::string>& items, size_t initial_selection,
bool menu_only, const std::function<int(int, bool)>& key_handler) = 0;
void EnqueueKey(int key_code);
// The normal and dimmed brightness percentages (default: 50 and 25, which means 50% and 25% of
// the max_brightness). Because the absolute values may vary across devices. These two values can
// be configured via subclassing. Setting brightness_normal_ to 0 to disable screensaver.
unsigned int brightness_normal_;
unsigned int brightness_dimmed_;
std::string brightness_file_;
std::string max_brightness_file_;
// Whether we should listen for touch inputs (default: false).
bool touch_screen_allowed_;
enum class ScreensaverState {
// The sensitivity when detecting a swipe.
const int kTouchLowThreshold;
const int kTouchHighThreshold;
void OnKeyDetected(int key_code);
void OnTouchDetected(int dx, int dy);
int OnInputEvent(int fd, uint32_t epevents);
void ProcessKey(int key_code, int updown);
void TimeKey(int key_code, int count);
bool IsUsbConnected();
bool InitScreensaver();
// Key event input queue
std::mutex key_queue_mutex;
std::condition_variable key_queue_cond;
int key_queue[256], key_queue_len;
char key_pressed[KEY_MAX + 1]; // under key_queue_mutex
int key_last_down; // under key_queue_mutex
bool key_long_press; // under key_queue_mutex
int key_down_count; // under key_queue_mutex
bool enable_reboot; // under key_queue_mutex
int rel_sum;
int consecutive_power_keys;
int last_key;
bool has_power_key;
bool has_up_key;
bool has_down_key;
bool has_touch_screen;
// Touch event related variables. See the comments in RecoveryUI::OnInputEvent().
int touch_slot_;
int touch_X_;
int touch_Y_;
int touch_start_X_;
int touch_start_Y_;
bool touch_finger_down_;
bool touch_swiping_;
bool is_bootreason_recovery_ui_;
std::thread input_thread_;
std::atomic<bool> input_thread_stopped_{ false };
ScreensaverState screensaver_state_;
// The following two contain the absolute values computed from brightness_normal_ and
// brightness_dimmed_ respectively.
unsigned int brightness_normal_value_;
unsigned int brightness_dimmed_value_;
#endif // RECOVERY_UI_H