Method

GdkWindowcoords_from_parent

since: 2.22

Declaration [src]

void
gdk_window_coords_from_parent (
  GdkWindow* window,
  gdouble parent_x,
  gdouble parent_y,
  gdouble* x,
  gdouble* y
)

Description [src]

Transforms window coordinates from a parent window to a child window, where the parent window is the normal parent as returned by gdk_window_get_parent() for normal windows, and the window’s embedder as returned by gdk_offscreen_window_get_embedder() for offscreen windows.

For normal windows, calling this function is equivalent to subtracting the return values of gdk_window_get_position() from the parent coordinates. For offscreen windows however (which can be arbitrarily transformed), this function calls the GdkWindow::from-embedder: signal to translate the coordinates.

You should always use this function when writing generic code that walks down a window hierarchy.

See also: gdk_window_coords_to_parent()

Available since: 2.22

Parameters

parent_x

Type: gdouble

X coordinate in parent’s coordinate system.

parent_y

Type: gdouble

Y coordinate in parent’s coordinate system.

x

Type: gdouble*

Return location for X coordinate in child’s coordinate system.

The argument will be set by the function.

The argument can be NULL.

y

Type: gdouble*

Return location for Y coordinate in child’s coordinate system.

The argument will be set by the function.

The argument can be NULL.