Universal Windows® Apps with XAML and C# Unleashed

Touch Input

Universal apps can leverage a large number of events that enable any kind of touch interaction imaginable. This rich functionality is exposed through UIElement, so it is pervasive as well as flexible. It’s worth noting that because of the rich built-in behaviors of the built-in controls, certain types of apps don’t ever need to directly interact directly with any of these events. Controls such as ScrollViewer, as seen in the preceding chapter, handle a number of touch events on your behalf and already do what you (and users) expect them to do.

Touch events can be separated into three categories:

→ Pointers—The lowest-level raw events

→ Gestures—Higher-level events for motions calculated from the pointer events

→ Manipulations—Complex ...