Method
GdkSurfaceset_input_region
Declaration [src]
void
gdk_surface_set_input_region (
GdkSurface* surface,
cairo_region_t* region
)
Description [src]
Apply the region to the surface for the purpose of event handling.
Mouse events which happen while the pointer position corresponds
to an unset bit in the mask will be passed on the surface below
surface.
An input region is typically used with RGBA surfaces. The alpha channel of the surface defines which pixels are invisible and allows for nicely antialiased borders, and the input region controls where the surface is “clickable”.
Use gdk_display_supports_input_shapes() to find out if
a particular backend supports input regions.
Parameters
region-
Type:
cairo_region_tRegion of surface to be reactive.
The data is owned by the caller of the method.