private ManipulationDevice(UIElement element) : base()
{
_target = element;
_activeSource = PresentationSource.CriticalFromVisual(element);
_inputManager = InputManager.UnsecureCurrent;
_inputManager.PostProcessInput += new ProcessInputEventHandler(PostProcessInput);
_manipulationLogic = new ManipulationLogic(this);
}
internal void OnManipulatorUpdated(object sender, EventArgs e)
{
// After a period of inactivity, the ManipulationDevice will stop polling at the screen framerate
// to stop wasting CPU usage. This notification will tell the device that activity is happening
// so that it can know to poll.
LastUpdatedTimestamp = ManipulationLogic.GetCurrentTimestamp();
ResumeAllTicking(); // Resumes the ticking of all the suspended devices on the thread
StartTicking(); // Ensures that we continue ticking or restart ticking for this device
}
private ManipulationDevice(UIElement element) : base()
{
_target = element;
_activeSource = PresentationSource.CriticalFromVisual(element);
_inputManager = InputManager.UnsecureCurrent;
_inputManager.PostProcessInput += new ProcessInputEventHandler(PostProcessInput);
_manipulationLogic = new ManipulationLogic(this);
}
private void OnRendering(object sender, EventArgs e)
{
ReportFrame();
// If Manipulation didn't activate or becomes disabled, then stop ticking.
// If we've exceeded the timeout without any manipulators updating, then stop ticking
// to save energy. If a manipulator updates, we'll start ticking again.
if (!IsManipulationActive ||
(ManipulationLogic.GetCurrentTimestamp() - LastUpdatedTimestamp) > ThrottleTimeout)
{
_wasTicking = _ticking; // ReportFrame could have stopped the ticking, hence take the latest value.
StopTicking();
}
}
