public bool OnKeyPressed(
Key key,
KeyState key_state,
double speed_up,
bool is_short_modifier_press,
bool is_repetition,
bool is_modifier,
InputProvider input_provider)
{
// The application grabs control over cursor when modifier is pressed.
if (key == Key.Modifier)
{
if (key_state == KeyState.Down)
{
StartControlling();
return(true);
}
if (key_state == KeyState.Up)
{
if (mouse_state == EyeTrackingMouse.MouseState.Idle)
{
return(false);
}
bool handled = true;
if (is_short_modifier_press)
{
input_provider.SendModifierDown();
input_provider.SendModifierUp();
handled = true;
}
StopControlling();
return(handled);
}
}
if (mouse_state == EyeTrackingMouse.MouseState.Idle)
{
return(false);
}
if (key == Key.Unbound)
{
// The application intercepts modifier key presses. We do not want to lose modifier when handling unbound keys.
// We stop controlling cursor when facing the first unbound key and send modifier keystroke to OS before handling pressed key.
if (!is_modifier)
{
input_provider.SendModifierDown();
StopControlling();
}
return(false);
}
var repetition_white_list = new SortedSet <Key> {
Key.ScrollDown,
Key.ScrollUp,
Key.ScrollLeft,
Key.ScrollRight,
Key.CalibrateLeft,
Key.CalibrateRight,
Key.CalibrateUp,
Key.CalibrateDown,
};
if (is_repetition && !repetition_white_list.Contains(key))
{
return(true);
}
if (key_state == KeyState.Down)
{
// Calibration
int calibration_step = (int)(Options.Instance.calibration_step * speed_up);
if (key == Key.CalibrateLeft)
{
StartCalibration();
calibration_shift.X -= calibration_step;
freeze_until = DateTime.Now.AddMilliseconds(Options.Instance.calibrate_freeze_time_ms);
statistics.OnCalibrate();
}
if (key == Key.CalibrateRight)
{
StartCalibration();
calibration_shift.X += calibration_step;
freeze_until = DateTime.Now.AddMilliseconds(Options.Instance.calibrate_freeze_time_ms);
statistics.OnCalibrate();
}
if (key == Key.CalibrateUp)
{
StartCalibration();
calibration_shift.Y -= calibration_step;
freeze_until = DateTime.Now.AddMilliseconds(Options.Instance.calibrate_freeze_time_ms);
statistics.OnCalibrate();
}
if (key == Key.CalibrateDown)
{
StartCalibration();
calibration_shift.Y += calibration_step;
freeze_until = DateTime.Now.AddMilliseconds(Options.Instance.calibrate_freeze_time_ms);
statistics.OnCalibrate();
}
// Scroll
if (key == Key.ScrollDown)
{
MouseButtons.WheelDown((int)(Options.Instance.vertical_scroll_step * speed_up));
}
if (key == Key.ScrollUp)
{
MouseButtons.WheelUp((int)(Options.Instance.vertical_scroll_step * speed_up));
}
if (key == Key.ScrollLeft)
{
MouseButtons.WheelLeft((int)(Options.Instance.horizontal_scroll_step * speed_up));
}
if (key == Key.ScrollRight)
{
MouseButtons.WheelRight((int)(Options.Instance.horizontal_scroll_step * speed_up));
}
}
// Mouse buttons
if (mouse_state == MouseState.Calibrating &&
(key == Key.LeftMouseButton || key == Key.RightMouseButton))
{
ShiftsStorage.Instance.AddShift(
new ShiftsStorage.Position(gaze_point.X, gaze_point.Y, left_eye, right_eye, head_position, head_direction),
calibration_shift);
mouse_state = MouseState.Controlling;
}
if (key == Key.LeftMouseButton)
{
if (key_state == KeyState.Down)
{
// Freeze cursor for a short period of time after mouse clicks to make double clicks esier.
MouseButtons.LeftDown();
freeze_until = DateTime.Now.AddMilliseconds(Options.Instance.click_freeze_time_ms);
statistics.OnClick();
}
else if (key_state == KeyState.Up)
{
MouseButtons.LeftUp();
}
}
if (key == Key.RightMouseButton)
{
if (key_state == KeyState.Down)
{
// Freeze cursor for a short period of time after mouse clicks to make double clicks esier.
MouseButtons.RightDown();
freeze_until = DateTime.Now.AddMilliseconds(Options.Instance.click_freeze_time_ms);
statistics.OnClick();
}
else if (key_state == KeyState.Up)
{
MouseButtons.RightUp();
}
}
if (key == Key.ShowCalibrationView && key_state == KeyState.Down)
{
App.ToggleCalibrationWindow();
}
return(true);
}
bool InputProvider.IInputReceiver.OnKeyPressed(Key key, KeyState key_state, bool is_modifier)
{
lock (Helpers.locker)
{
// If you hold a key pressed for a second it will start to produce a sequence of rrrrrrrrrrepeated |KeyState.Down| events.
// For some keys we don't want to handle such events and assume that a key stays pressed until |KeyState.Up| appears.
bool is_repetition = interaction_history[0].Key == key &&
interaction_history[0].State == key_state &&
key_state == KeyState.Down;
if (!is_repetition)
{
interaction_history[2] = interaction_history[1];
interaction_history[1] = interaction_history[0];
interaction_history[0].Key = key;
interaction_history[0].State = key_state;
interaction_history[0].Time = DateTime.Now;
}
float speed_up = 1.0f;
if (is_repetition)
{
speed_up = 2.0f;
}
else if (key_state == KeyState.Down &&
interaction_history[1].Key == key &&
interaction_history[2].Key == key)
{
if ((DateTime.Now - interaction_history[2].Time).TotalMilliseconds < Options.Instance.quadriple_speed_up_press_time_ms)
{
speed_up = 4.0f;
}
else if ((DateTime.Now - interaction_history[2].Time).TotalMilliseconds < Options.Instance.double_speedup_press_time_ms)
{
speed_up = 2.0f;
}
}
// Single and double modifier presses have different functions
// Single press goes to OS (this allows using WINDOWS MENU)
// Double press enables |always_on| mode.
if (is_waiting_for_second_modifier_press)
{
is_waiting_for_second_modifier_press = false;
if (key == Key.Modifier && key_state == KeyState.Down &&
(DateTime.Now - interaction_history[1].Time).TotalMilliseconds < 300)
{
always_on = true;
eye_tracking_mouse.StartControlling();
return(true);
}
}
// IF user pressed and released modifier key without pressing other buttons in between...
if (key == Key.Modifier &&
key_state == KeyState.Up &&
interaction_history[1].Key == key &&
!always_on)
{
double press_duration_ms = (DateTime.Now - interaction_history[1].Time).TotalMilliseconds;
// THEN it might be a beginning of a double press...
if (press_duration_ms < 300)
{
is_waiting_for_second_modifier_press = true;
}
// OR it might be a single modifier press that should go to OS.
if (press_duration_ms < Options.Instance.modifier_short_press_duration_ms &&
(DateTime.Now - always_on_disabled_time).TotalMilliseconds > 300)
{
is_waiting_for_second_modifier_press = true;
App.Current.Dispatcher.InvokeAsync((async() =>
{
await Task.Delay(300);
lock (Helpers.locker)
{
if (!is_waiting_for_second_modifier_press)
{
return;
}
is_waiting_for_second_modifier_press = false;
input_provider.SendModifierDown();
input_provider.SendModifierUp();
}
}));
}
}
if (always_on)
{
if (key == Key.Modifier && key_state == KeyState.Up)
{
return(true);
}
if (key == Key.Unbound ||
(key == Key.Modifier && key_state == KeyState.Down))
{
always_on = false;
always_on_disabled_time = DateTime.Now;
eye_tracking_mouse.StopControlling();
}
}
return(eye_tracking_mouse.OnKeyPressed(key, key_state, speed_up, is_repetition, is_modifier, input_provider));
}
}