Using the Callback Function Realization Touch Screen Gestures Recognition of Computer

Callback function of the software design is a kind of very important function call in some way, application of its role is irreplaceable. Using the callback function can improve the software structure and improve software reusability, still can realize the program of communication between complex. Callback function can put the caller and caller separate, caller don´t care who is called, all it needs to know, but there is a certain specific prototype, certain constraints (int) as the return value is the called function, reduce the coupling between the module. Based on this, the paper through the callback function has realized the computer touch screen gestures recognition, greatly improving the software reusability and flexibility.