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Architectural Overview_Messages for Windows Touch Input and Gestures.doc

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Architectural Overview_Messages for Windows Touch Input and Gestures

Architectural Overview This architectural overview provides context for the Windows Touch API for Tablet and Touch Technologies and explains how it fits into the larger Windows 7 architecture. Messages for Windows Touch Input and Gestures Messaging features for Windows Touch are enabled by listening and interpreting messages during execution. The following illustration shows how messages are generated from hardware and sent to applications by Windows 7. In the leftmost column of the illustration, touch-sensitive hardware receives input from a user. A driver then communicates between the hardware and the OS. Next, the OS generates a WM_TOUCH or WM_GESTURE message that is then sent to an applications HWND. The application then updates the UI given the information encapsulated in the message. Applications receive gestures by default. Unless an application registers for Windows Touch input messages with the RegisterTouchWindow function, notifications for gestures (WM_GESTURE messages) are created by Windows and sent to that application window. If an application Window registers to receive touch messages, notifications for Windows Touch input (WM_TOUCH messages) are sent to that application window. Windows Touch and gesture messages are greedy in the sense that after a touch is made or a gesture begins on an application Window, all messages are sent to that application until the gesture completes or the primary touch is completed. For legacy support, Windows interprets WM_GESTURE messages if they are bubbled up and then will SEND or POST appropriate messages that map to the gesture. To avoid breaking legacy support, make sure that you forward WM_GESTURE messages using DefWindowProc. More information on legacy support can be found in the section Windows Touch Gestures Overview. Manipulations and Inertia Windows Touch programmers must be able to interpret gestures from multiple sources in a manner that is meaningful for the gesture taking place. Microsoft provides the m