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5bff3c86ab
Measure required height by quickly maximizing once per screen. A search for a better method failed.
124 lines
4.1 KiB
Python
124 lines
4.1 KiB
Python
"Zoom a window to maximum height."
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import re
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import sys
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import tkinter
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class WmInfoGatheringError(Exception):
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pass
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class ZoomHeight:
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# Cached values for maximized window dimensions, one for each set
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# of screen dimensions.
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_max_height_and_y_coords = {}
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def __init__(self, editwin):
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self.editwin = editwin
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self.top = self.editwin.top
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def zoom_height_event(self, event=None):
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zoomed = self.zoom_height()
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if zoomed is None:
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self.top.bell()
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else:
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menu_status = 'Restore' if zoomed else 'Zoom'
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self.editwin.update_menu_label(menu='options', index='* Height',
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label=f'{menu_status} Height')
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return "break"
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def zoom_height(self):
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top = self.top
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width, height, x, y = get_window_geometry(top)
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if top.wm_state() != 'normal':
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# Can't zoom/restore window height for windows not in the 'normal'
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# state, e.g. maximized and full-screen windows.
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return None
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try:
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maxheight, maxy = self.get_max_height_and_y_coord()
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except WmInfoGatheringError:
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return None
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if height != maxheight:
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# Maximize the window's height.
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set_window_geometry(top, (width, maxheight, x, maxy))
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return True
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else:
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# Restore the window's height.
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#
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# .wm_geometry('') makes the window revert to the size requested
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# by the widgets it contains.
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top.wm_geometry('')
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return False
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def get_max_height_and_y_coord(self):
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top = self.top
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screen_dimensions = (top.winfo_screenwidth(),
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top.winfo_screenheight())
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if screen_dimensions not in self._max_height_and_y_coords:
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orig_state = top.wm_state()
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# Get window geometry info for maximized windows.
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try:
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top.wm_state('zoomed')
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except tkinter.TclError:
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# The 'zoomed' state is not supported by some esoteric WMs,
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# such as Xvfb.
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raise WmInfoGatheringError(
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'Failed getting geometry of maximized windows, because ' +
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'the "zoomed" window state is unavailable.')
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top.update()
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maxwidth, maxheight, maxx, maxy = get_window_geometry(top)
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if sys.platform == 'win32':
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# On Windows, the returned Y coordinate is the one before
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# maximizing, so we use 0 which is correct unless a user puts
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# their dock on the top of the screen (very rare).
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maxy = 0
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maxrooty = top.winfo_rooty()
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# Get the "root y" coordinate for non-maximized windows with their
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# y coordinate set to that of maximized windows. This is needed
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# to properly handle different title bar heights for non-maximized
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# vs. maximized windows, as seen e.g. in Windows 10.
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top.wm_state('normal')
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top.update()
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orig_geom = get_window_geometry(top)
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max_y_geom = orig_geom[:3] + (maxy,)
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set_window_geometry(top, max_y_geom)
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top.update()
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max_y_geom_rooty = top.winfo_rooty()
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# Adjust the maximum window height to account for the different
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# title bar heights of non-maximized vs. maximized windows.
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maxheight += maxrooty - max_y_geom_rooty
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self._max_height_and_y_coords[screen_dimensions] = maxheight, maxy
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set_window_geometry(top, orig_geom)
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top.wm_state(orig_state)
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return self._max_height_and_y_coords[screen_dimensions]
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def get_window_geometry(top):
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geom = top.wm_geometry()
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m = re.match(r"(\d+)x(\d+)\+(-?\d+)\+(-?\d+)", geom)
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return tuple(map(int, m.groups()))
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def set_window_geometry(top, geometry):
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top.wm_geometry("{:d}x{:d}+{:d}+{:d}".format(*geometry))
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if __name__ == "__main__":
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from unittest import main
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main('idlelib.idle_test.test_zoomheight', verbosity=2, exit=False)
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# Add htest?
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