Function _place_window

Lib/tkinter/simpledialog.py:231–257

(w, parent=None)

# Place a toplevel window at the center of parent or screen
# It is a Python implementation of ::tk::PlaceWindow.
def _place_window(w, parent=None):
    w.wm_withdraw() # Remain invisible while we figure out the geometry
    w.update_idletasks() # Actualize geometry information

    minwidth = w.winfo_reqwidth()
    minheight = w.winfo_reqheight()
    maxwidth = w.winfo_vrootwidth()
    maxheight = w.winfo_vrootheight()
    if parent is not None and parent.winfo_ismapped():
        x = parent.winfo_rootx() + (parent.winfo_width() - minwidth) // 2
        y = parent.winfo_rooty() + (parent.winfo_height() - minheight) // 2
        vrootx = w.winfo_vrootx()
        vrooty = w.winfo_vrooty()
        x = min(x, vrootx + maxwidth - minwidth)
        x = max(x, vrootx)
        y = min(y, vrooty + maxheight - minheight)
        y = max(y, vrooty)
        if w._windowingsystem == 'aqua':
            # Avoid the native menu bar which sits on top of everything.
            y = max(y, 22)
    else:
        x = (w.winfo_screenwidth() - minwidth) // 2
        y = (w.winfo_screenheight() - minheight) // 2

    w.wm_maxsize(maxwidth, maxheight)
    w.wm_geometry('+%d+%d' % (x, y))
    w.wm_deiconify() # Become visible at the desired location


def _setup_dialog(w):