CustomTkinter/customtkinter/windows/widgets/appearance_mode/appearance_mode_tracker.py
2022-10-29 21:56:00 +02:00

136 lines
4.0 KiB
Python

import sys
import tkinter
from distutils.version import StrictVersion as Version
from typing import Callable
try:
import darkdetect
if Version(darkdetect.__version__) < Version("0.3.1"):
sys.stderr.write("WARNING: You have to upgrade the darkdetect library: pip3 install --upgrade darkdetect\n")
if sys.platform != "darwin":
exit()
except ImportError as err:
raise err
except Exception:
sys.stderr.write("customtkinter.appearance_mode_tracker warning: failed to import darkdetect")
class AppearanceModeTracker:
callback_list = []
app_list = []
update_loop_running = False
update_loop_interval = 30 # milliseconds
appearance_mode_set_by = "system"
appearance_mode = 0 # Light (standard)
@classmethod
def init_appearance_mode(cls):
if cls.appearance_mode_set_by == "system":
new_appearance_mode = cls.detect_appearance_mode()
if new_appearance_mode != cls.appearance_mode:
cls.appearance_mode = new_appearance_mode
cls.update_callbacks()
@classmethod
def add(cls, callback: Callable, widget=None):
cls.callback_list.append(callback)
if widget is not None:
app = cls.get_tk_root_of_widget(widget)
if app not in cls.app_list:
cls.app_list.append(app)
if not cls.update_loop_running:
app.after(cls.update_loop_interval, cls.update)
cls.update_loop_running = True
@classmethod
def remove(cls, callback: Callable):
try:
cls.callback_list.remove(callback)
except ValueError:
return
@staticmethod
def detect_appearance_mode() -> int:
try:
if darkdetect.theme() == "Dark":
return 1 # Dark
else:
return 0 # Light
except NameError:
return 0 # Light
@classmethod
def get_tk_root_of_widget(cls, widget):
current_widget = widget
while isinstance(current_widget, tkinter.Tk) is False:
current_widget = current_widget.master
return current_widget
@classmethod
def update_callbacks(cls):
if cls.appearance_mode == 0:
for callback in cls.callback_list:
try:
callback("Light")
except Exception:
continue
elif cls.appearance_mode == 1:
for callback in cls.callback_list:
try:
callback("Dark")
except Exception:
continue
@classmethod
def update(cls):
if cls.appearance_mode_set_by == "system":
new_appearance_mode = cls.detect_appearance_mode()
if new_appearance_mode != cls.appearance_mode:
cls.appearance_mode = new_appearance_mode
cls.update_callbacks()
# find an existing tkinter.Tk object for the next call of .after()
for app in cls.app_list:
try:
app.after(cls.update_loop_interval, cls.update)
return
except Exception:
continue
cls.update_loop_running = False
@classmethod
def get_mode(cls) -> int:
return cls.appearance_mode
@classmethod
def set_appearance_mode(cls, mode_string: str):
if mode_string.lower() == "dark":
cls.appearance_mode_set_by = "user"
new_appearance_mode = 1
if new_appearance_mode != cls.appearance_mode:
cls.appearance_mode = new_appearance_mode
cls.update_callbacks()
elif mode_string.lower() == "light":
cls.appearance_mode_set_by = "user"
new_appearance_mode = 0
if new_appearance_mode != cls.appearance_mode:
cls.appearance_mode = new_appearance_mode
cls.update_callbacks()
elif mode_string.lower() == "system":
cls.appearance_mode_set_by = "system"