1 2VCL positioning 3 4Window coordinates are parent relative, with exception of maState fields, they 5have screen coordinates. 6 7Every window has a parent window, usually the client area of an existing window, 8otherwise the desktop window. 9 10When a window is to be sized/moved, SetPosSize is called. 11Since coordinates are the position/size of client area, we need to calculate 12current window frame size/position and map to screen coordinates using the 13owner window position as offset. 14