cola/hidpi.py

   1 """Provides High DPI support by wrapping Qt options"""
   2 from __future__ import absolute_import, division, unicode_literals
   3
   4 from qtpy import QtCore
   5
   6 from .i18n import N_
   7 from . import core
   8 from . import compat
   9 from . import version
  10
  11
  12 class Option(object):
  13     AUTO = '0'
  14     DISABLE = 'disable'
  15     TIMES_1 = '1'
  16     TIMES_1_5 = '1.5'
  17     TIMES_2 = '2'
  18
  19
  20 def is_supported():
  21     return version.check('qt-hidpi-scale', QtCore.__version__)
  22
  23
  24 def apply_choice(value):
  25     value = compat.ustr(value)
  26     if value == Option.AUTO:
  27         # Do not override the configuration when either of these
  28         # two environment variables are defined.
  29         if not core.getenv('QT_AUTO_SCREEN_SCALE_FACTOR') and not core.getenv(
  30             'QT_SCALE_FACTOR'
  31         ):
  32             compat.setenv('QT_AUTO_SCREEN_SCALE_FACTOR', '1')
  33             compat.unsetenv('QT_SCALE_FACTOR')
  34     elif value in (Option.TIMES_1, Option.TIMES_1_5, Option.TIMES_2):
  35         compat.unsetenv('QT_AUTO_SCREEN_SCALE_FACTOR')
  36         compat.setenv('QT_SCALE_FACTOR', value)
  37
  38
  39 def options():
  40     return (
  41         (N_('Auto'), Option.AUTO),
  42         (N_('Disable'), Option.DISABLE),
  43         (N_('x 1'), Option.TIMES_1),
  44         (N_('x 1.5'), Option.TIMES_1_5),
  45         (N_('x 2'), Option.TIMES_2),
  46     )