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_t

Region of surface to be reactive.

The data is owned by the caller of the function.