142 lines
3.2 KiB
Groff
142 lines
3.2 KiB
Groff
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.TH MiniLibX 3 "September 19, 2002"
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.SH NAME
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MiniLibX - Handle events
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.SH SYNOPSYS
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.nf
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.I int
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.fi
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.B mlx_loop
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(
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.I void *mlx_ptr
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);
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.nf
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.I int
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.fi
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.B mlx_key_hook
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(
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.I void *win_ptr, int (*funct_ptr)(), void *param
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);
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.nf
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.I int
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.fi
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.B mlx_mouse_hook
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(
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.I void *win_ptr, int (*funct_ptr)(), void *param
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);
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.nf
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.I int
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.fi
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.B mlx_expose_hook
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(
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.I void *win_ptr, int (*funct_ptr)(), void *param
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);
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.nf
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.I int
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.fi
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.B mlx_loop_hook
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(
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.I void *mlx_ptr, int (*funct_ptr)(), void *param
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);
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.SH X-WINDOW EVENTS
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The X-Window system is bi-directionnal. On one hand, the program sends orders to
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the screen to display pixels, images, and so on. On the other hand,
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it can get information from the keyboard and mouse associated to
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the screen. To do so, the program receives "events" from the keyboard or the
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mouse.
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.SH DESCRIPTION
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To receive events, you must use
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.B mlx_loop
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(). This function never returns. It is an infinite loop that waits for
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an event, and then calls a user-defined function associated with this event.
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A single parameter is needed, the connection identifier
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.I mlx_ptr
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(see the
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.B mlx manual).
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You can assign different functions to the three following events:
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.br
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- A key is pressed
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.br
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- The mouse button is pressed
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.br
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- A part of the window should be re-drawn
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(this is called an "expose" event, and it is your program's job to handle it).
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.br
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Each window can define a different function for the same event.
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The three functions
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.B mlx_key_hook
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(),
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.B mlx_mouse_hook
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() and
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.B mlx_expose_hook
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() work exactly the same way.
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.I funct_ptr
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is a pointer to the function you want to be called
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when an event occurs. This assignment is specific to the window defined by the
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.I win_ptr
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identifier. The
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.I param
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adress will be passed to the function everytime it is called, and should be
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used to store the parameters it might need.
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The syntax for the
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.B mlx_loop_hook
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() function is identical to the previous ones, but the given function will be
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called when no event occurs.
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When it catches an event, the MiniLibX calls the corresponding function
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with fixed parameters:
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.nf
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expose_hook(void *param);
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key_hook(int keycode,void *param);
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mouse_hook(int button,int x,int y,void *param);
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loop_hook(void *param);
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.fi
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These function names are arbitrary. They here are used to distinguish
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parameters according to the event. These functions are NOT part of the
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MiniLibX.
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.I param
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is the address specified in the mlx_*_hook calls. This address is never
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used nor modified by the MiniLibX. On key and mouse events, additional
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information is passed:
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.I keycode
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tells you which key is pressed (look for the X11 include file "keysymdef.h"),
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(
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.I x
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,
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.I y
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) are the coordinates of the mouse click in the window, and
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.I button
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tells you which mouse button was pressed.
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.SH GOING FURTHER WITH EVENTS
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The MiniLibX provides a much generic access to all X-Window events. The
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.I mlx.h
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include define
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.B mlx_hook()
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in the same manner mlx_*_hook functions work. The event and mask values
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will be taken from the X11 include file "X.h".
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See source code of mlx_int_param_event.c to find out how the MiniLibX will
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call your own function for a specific event.
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.SH SEE ALSO
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mlx(3), mlx_new_window(3), mlx_pixel_put(3), mlx_new_image(3)
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.SH AUTHOR
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Copyright ol@ - 2002-2014 - Olivier Crouzet
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