Open Neovim-Qt windows centered (simpler)

ginit.vim

function! s:set_size(...)
  " https://github.com/equalsraf/neovim-qt/issues/251
  py3 << EOF
import vim
from ctypes import *
u32 = WinDLL('user32.dll')
GetForegroundWindow = u32.GetForegroundWindow



def center_window(hwnd):
    MonitorFromWindow = u32.MonitorFromWindow
    GetMonitorInfoA = u32.GetMonitorInfoA
    SetWindowPos = u32.SetWindowPos
    SetForegroundWindow = u32.SetForegroundWindow


    class _rect_t(Structure):
        _fields_ = [
            ('left',    c_long),
            ('top',     c_long),
            ('right',   c_long),
            ('bottom',  c_long)
        ]

    class _monitor_info_t(Structure):
        _fields_ = [
            ('cbSize',     c_ulong),
            ('rcMonitor',  _rect_t),
            ('rcWork',     _rect_t),
            ('dwFlags',    c_ulong)
        ]

    MONITOR_DEFAULTTONEAREST = 0 # Probably

    mon = MonitorFromWindow(hwnd, MONITOR_DEFAULTTONEAREST)

    # Monitor info code gotten from:
    # http://nullege.com/codes/show/src%40s%40u%40SublimeSpeech-HEAD%40lib%40dragonfly%40windows%40monitor.py/118/windll.user32.GetMonitorInfoA/python

    info = _monitor_info_t()
    info.cbSize     = sizeof(_monitor_info_t)
    info.rcMonitor  = _rect_t()
    info.rcWork     = _rect_t()

    GetMonitorInfoA(mon, byref(info))

    mon_width = info.rcMonitor.right - info.rcMonitor.left
    mon_height = info.rcMonitor.bottom - info.rcMonitor.top

    mid_w = mon_width / 2
    mid_h = mon_height / 2

    WIDTH = int(mon_width * 45.0/100.0)
    HEIGHT = int(mon_height * 9.0/10.0)

    LEFT = info.rcMonitor.left + int(mid_w - (WIDTH / 2))
    TOP = info.rcMonitor.top + int(mid_h - (HEIGHT / 2))

    SetWindowPos(hwnd, 0, LEFT, TOP, WIDTH, HEIGHT, 0)
    SetForegroundWindow(hwnd)


vim_win = GetForegroundWindow()
center_window(vim_win)
EOF
endfunction


if exists('g:GuiLoaded')

  call s:set_size()
endif