Pointers
Input for universal apps is consolidated into a concept called a pointer. No, this isn’t a C++-style pointer, it’s an abstraction for three separate kinds of input: touch, mouse, and pen. This enables an app to use a single set of APIs for the things that touch, mouse, and pen have in common, which is quite a bit.
The pointer abstraction involves four main classes: PointerDevice, Pointer, PointerPoint, and PointerPointProperties. Figure 5.1 demonstrates their meaning and relationship. A single PC can (and often does) have multiple PointerDevices, each PointerDevice can support multiple Pointers (such as five fingers for touch), and each Pointer can generate a series of PointerPoints.
FIGURE 5.1 The four main pointer classes that consolidate ...
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