Window.coordsFromParent

void coordsFromParent(double parentX, double parentY, out double x, out double y)

Transforms window coordinates from a parent window to a child window, where the parent window is the normal parent as returned by gdk.window.Window.getParent for normal windows, and the window's embedder as returned by gdk.global.offscreenWindowGetEmbedder for offscreen windows.

For normal windows, calling this function is equivalent to subtracting the return values of gdk.window.Window.getPosition 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.

Parameters

`parentX`	X coordinate in parent’s coordinate system
`parentY`	Y coordinate in parent’s coordinate system
`x`	return location for X coordinate in child’s coordinate system
`y`	return location for Y coordinate in child’s coordinate system