CustomTkinter/customtkinter/scaling_tracker.py
2022-05-26 19:16:01 +02:00

182 lines
7.4 KiB
Python

import tkinter
import sys
from typing import Callable
class ScalingTracker:
deactivate_automatic_dpi_awareness = False
window_widgets_dict = {} # contains window objects as keys with list of widget callbacks as elements
window_dpi_scaling_dict = {} # contains window objects as keys and corresponding scaling factors
widget_scaling = 1 # user values which multiply to detected window scaling factor
window_scaling = 1
spacing_scaling = 1
update_loop_running = False
update_loop_interval = 150 # milliseconds
@classmethod
def get_widget_scaling(cls, widget) -> float:
window_root = cls.get_window_root_of_widget(widget)
return cls.window_dpi_scaling_dict[window_root] * cls.widget_scaling
@classmethod
def get_spacing_scaling(cls, widget) -> float:
window_root = cls.get_window_root_of_widget(widget)
return cls.window_dpi_scaling_dict[window_root] * cls.spacing_scaling
@classmethod
def get_window_scaling(cls, window) -> float:
window_root = cls.get_window_root_of_widget(window)
return cls.window_dpi_scaling_dict[window_root] * cls.window_scaling
@classmethod
def set_widget_scaling(cls, widget_scaling_factor: float):
cls.widget_scaling = max(widget_scaling_factor, 0.4)
cls.update_scaling_callbacks_all()
@classmethod
def set_spacing_scaling(cls, spacing_scaling_factor: float):
cls.spacing_scaling = max(spacing_scaling_factor, 0.4)
cls.update_scaling_callbacks_all()
@classmethod
def set_window_scaling(cls, window_scaling_factor: float):
cls.window_scaling = max(window_scaling_factor, 0.4)
cls.update_scaling_callbacks_all()
@classmethod
def get_window_root_of_widget(cls, widget):
current_widget = widget
while isinstance(current_widget, tkinter.Tk) is False and\
isinstance(current_widget, tkinter.Toplevel) is False:
current_widget = current_widget.master
return current_widget
@classmethod
def update_scaling_callbacks_all(cls):
for window, callback_list in cls.window_widgets_dict.items():
for set_scaling_callback in callback_list:
if not cls.deactivate_automatic_dpi_awareness:
set_scaling_callback(cls.window_dpi_scaling_dict[window] * cls.widget_scaling,
cls.window_dpi_scaling_dict[window] * cls.spacing_scaling,
cls.window_dpi_scaling_dict[window] * cls.window_scaling)
else:
set_scaling_callback(cls.widget_scaling,
cls.spacing_scaling,
cls.window_scaling)
@classmethod
def update_scaling_callbacks_for_window(cls, window):
for set_scaling_callback in cls.window_widgets_dict[window]:
if not cls.deactivate_automatic_dpi_awareness:
set_scaling_callback(cls.window_dpi_scaling_dict[window] * cls.widget_scaling,
cls.window_dpi_scaling_dict[window] * cls.spacing_scaling,
cls.window_dpi_scaling_dict[window] * cls.window_scaling)
else:
set_scaling_callback(cls.widget_scaling,
cls.spacing_scaling,
cls.window_scaling)
@classmethod
def add_widget(cls, widget_callback: Callable, widget):
window_root = cls.get_window_root_of_widget(widget)
if window_root not in cls.window_widgets_dict:
cls.window_widgets_dict[window_root] = [widget_callback]
else:
cls.window_widgets_dict[window_root].append(widget_callback)
if window_root not in cls.window_dpi_scaling_dict:
cls.window_dpi_scaling_dict[window_root] = cls.get_window_dpi_scaling(window_root)
if not cls.update_loop_running:
window_root.after(100, cls.check_dpi_scaling)
cls.update_loop_running = True
@classmethod
def remove_widget(cls, widget_callback, widget):
window_root = cls.get_window_root_of_widget(widget)
try:
cls.window_widgets_dict[window_root].remove(widget_callback)
except:
pass
@classmethod
def remove_window(cls, window_callback, window):
try:
del cls.window_widgets_dict[window]
except:
pass
@classmethod
def add_window(cls, window_callback, window):
if window not in cls.window_widgets_dict:
cls.window_widgets_dict[window] = [window_callback]
else:
cls.window_widgets_dict[window].append(window_callback)
if window not in cls.window_dpi_scaling_dict:
cls.window_dpi_scaling_dict[window] = cls.get_window_dpi_scaling(window)
@classmethod
def activate_high_dpi_awareness(cls):
""" make process DPI aware, customtkinter elements will get scaled automatically,
only gets activated when CTk object is created """
if not cls.deactivate_automatic_dpi_awareness:
if sys.platform == "darwin":
pass # high DPI scaling works automatically on macOS
elif sys.platform.startswith("win"):
from ctypes import windll
windll.shcore.SetProcessDpiAwareness(2)
# Microsoft Docs: https://docs.microsoft.com/en-us/windows/win32/api/shellscalingapi/ne-shellscalingapi-process_dpi_awareness
else:
pass # DPI awareness on Linux not implemented
@classmethod
def get_window_dpi_scaling(cls, window) -> float:
if not cls.deactivate_automatic_dpi_awareness:
if sys.platform == "darwin":
return 1 # scaling works automatically on macOS
elif sys.platform.startswith("win"):
from ctypes import windll, pointer, wintypes
DPI100pc = 96 # DPI 96 is 100% scaling
DPI_type = 0 # MDT_EFFECTIVE_DPI = 0, MDT_ANGULAR_DPI = 1, MDT_RAW_DPI = 2
window_hwnd = wintypes.HWND(window.winfo_id())
monitor_handle = windll.user32.MonitorFromWindow(window_hwnd, wintypes.DWORD(2)) # MONITOR_DEFAULTTONEAREST = 2
x_dpi, y_dpi = wintypes.UINT(), wintypes.UINT()
windll.shcore.GetDpiForMonitor(monitor_handle, DPI_type, pointer(x_dpi), pointer(y_dpi))
return (x_dpi.value + y_dpi.value) / (2 * DPI100pc)
else:
return 1 # DPI awareness on Linux not implemented
else:
return 1
@classmethod
def check_dpi_scaling(cls):
# check for every window if scaling value changed
for window in cls.window_widgets_dict:
if window.winfo_exists():
current_dpi_scaling_value = cls.get_window_dpi_scaling(window)
if current_dpi_scaling_value != cls.window_dpi_scaling_dict[window]:
cls.window_dpi_scaling_dict[window] = current_dpi_scaling_value
cls.update_scaling_callbacks_for_window(window)
# find an existing tkinter object for the next call of .after()
for app in cls.window_widgets_dict.keys():
try:
app.after(cls.update_loop_interval, cls.check_dpi_scaling)
return
except Exception:
continue
cls.update_loop_running = False