SDL_MouseButtonEvent- Mouse button event structure
Uint16 x, y;
SDL_MOUSEBUTTONDOWN or SDL_MOUSEBUTTONUP
The mouse button index (SDL_BUTTON_LEFT, SDL_BUTTON_MIDDLE, SDL_BUTTON_RIGHT)
SDL_PRESSED or SDL_RELEASED
The X/Y coordinates of the mouse at press/release time
SDL_MouseButtonEvent is a member of the SDL_Event union and is used when an
event of type SDL_MOUSEBUTTONDOWN or SDL_MOUSEBUTTONUP is reported.
When a mouse button press or release is detected then number of the button
pressed (from 1 to 255, with 1 usually being the left button and 2 the right) is
placed into button, the position of the mouse when this event occured is stored
in the x and the y fields. Like SDL_KeyboardEvent, information on whether the
event was a press or a release event is stored in both the type and state
fields, but this should be obvious.