"Zoom a window to maximum height."
import re
import sys
import tkinter
class WmInfoGatheringError(Exception):
pass
class ZoomHeight:
# Cached values for maximized window dimensions, one for each set
# of screen dimensions.
_max_height_and_y_coords = {}
def __init__(self, editwin):
self.editwin = editwin
self.top = self.editwin.top
def zoom_height_event(self, event=None):
zoomed = self.zoom_height()
if zoomed is None:
self.top.bell()
else:
menu_status = 'Restore' if zoomed else 'Zoom'
self.editwin.update_menu_label(menu='options', index='* Height',
label=f'{menu_status} Height')
return "break"
def zoom_height(self):
top = self.top
width, height, x, y = get_window_geometry(top)
if top.wm_state() != 'normal':
# Can't zoom/restore window height for windows not in the 'normal'
# state, e.g. maximized and full-screen windows.
return None
try:
maxheight, maxy = self.get_max_height_and_y_coord()
except WmInfoGatheringError:
return None
if height != maxheight:
# Maximize the window's height.
set_window_geometry(top, (width, maxheight, x, maxy))
return True
else:
# Restore the window's height.
#
# .wm_geometry('') makes the window revert to the size requested
# by the widgets it contains.
top.wm_geometry('')
return False
def get_max_height_and_y_coord(self):
top = self.top
screen_dimensions = (top.winfo_screenwidth(),
top.winfo_screenheight())
if screen_dimensions not in self._max_height_and_y_coords:
orig_state = top.wm_state()
# Get window geometry info for maximized windows.
try:
top.wm_state('zoomed')
except tkinter.TclError:
# The 'zoomed' state is not supported by some esoteric WMs,
# such as Xvfb.
raise WmInfoGatheringError(
'Failed getting geometry of maximized windows, because ' +
'the "zoomed" window state is unavailable.')
top.update()
maxwidth, maxheight, maxx, maxy = get_window_geometry(top)
if sys.platform == 'win32':
# On Windows, the returned Y coordinate is the one before
# maximizing, so we use 0 which is correct unless a user puts
# their dock on the top of the screen (very rare).
maxy = 0
maxrooty = top.winfo_rooty()
# Get the "root y" coordinate for non-maximized windows with their
# y coordinate set to that of maximized windows. This is needed
# to properly handle different title bar heights for non-maximized
# vs. maximized windows, as seen e.g. in Windows 10.
top.wm_state('normal')
top.update()
orig_geom = get_window_geometry(top)
max_y_geom = orig_geom[:3] + (maxy,)
set_window_geometry(top, max_y_geom)
top.update()
max_y_geom_rooty = top.winfo_rooty()
# Adjust the maximum window height to account for the different
# title bar heights of non-maximized vs. maximized windows.
maxheight += maxrooty - max_y_geom_rooty
self._max_height_and_y_coords[screen_dimensions] = maxheight, maxy
set_window_geometry(top, orig_geom)
top.wm_state(orig_state)
return self._max_height_and_y_coords[screen_dimensions]
def get_window_geometry(top):
geom = top.wm_geometry()
m = re.match(r"(\d+)x(\d+)\+(-?\d+)\+(-?\d+)", geom)
return tuple(map(int, m.groups()))
def set_window_geometry(top, geometry):
top.wm_geometry("{:d}x{:d}+{:d}+{:d}".format(*geometry))
if __name__ == "__main__":
from unittest import main
main('idlelib.idle_test.test_zoomheight', verbosity=2, exit=False)
# Add htest?
