mirror of
https://github.com/TomSchimansky/CustomTkinter.git
synced 2023-08-10 21:13:13 +03:00
101 lines
3.5 KiB
Python
101 lines
3.5 KiB
Python
import tkinter
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import sys
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class ScalingTracker:
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window_widgets_dict = {} # contains window objects as keys with list of widget callbacks as elements
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window_dpi_scaling_dict = {} # contains window objects as keys and corresponding DPI values
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user_scaling = 1 # scale change of all widgets and windows
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update_loop_running = False
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@classmethod
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def get_widget_scaling(cls, widget):
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window_root = cls.get_window_root_of_widget(widget)
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return cls.window_dpi_scaling_dict[window_root] * cls.user_scaling
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@classmethod
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def get_window_scaling(cls, window):
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return cls.window_dpi_scaling_dict[window] * cls.user_scaling
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@classmethod
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def set_user_scaling(cls, user_scaling_factor):
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cls.user_scaling = user_scaling_factor
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cls.update_scaling_callbacks()
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@classmethod
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def get_window_root_of_widget(cls, widget):
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current_widget = widget
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while isinstance(current_widget, tkinter.Tk) is False and\
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isinstance(current_widget, tkinter.Toplevel) is False:
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current_widget = current_widget.master
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return current_widget
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@classmethod
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def update_scaling_callbacks(cls):
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for window, callback_list in cls.window_widgets_dict.items():
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for callback in callback_list:
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callback(cls.window_dpi_scaling_dict[window])
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@classmethod
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def add_widget(cls, widget_callback, widget):
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window_root = cls.get_window_root_of_widget(widget)
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if window_root not in cls.window_widgets_dict:
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cls.window_widgets_dict[window_root] = [widget_callback]
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else:
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cls.window_widgets_dict[window_root].append(widget_callback)
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if window_root not in cls.window_dpi_scaling_dict:
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cls.window_dpi_scaling_dict[window_root] = cls.get_window_dpi_value(window_root)
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if not cls.update_loop_running:
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window_root.after(100, cls.check_dpi_scaling)
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cls.update_loop_running = True
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@classmethod
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def add_window(cls, window_callback, window):
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if window not in cls.window_widgets_dict:
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cls.window_widgets_dict[window] = [window_callback]
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else:
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cls.window_widgets_dict[window].append(window_callback)
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if window not in cls.window_dpi_scaling_dict:
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cls.window_dpi_scaling_dict[window] = cls.get_window_dpi_value(window)
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@classmethod
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def get_window_dpi_value(cls, window):
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if sys.platform == "darwin":
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return 1 # scaling works automatically on macOS
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elif sys.platform.startswith("win"):
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from ctypes import windll, pointer, wintypes
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DPI100pc = 96 # DPI 96 is 100% scaling
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DPI_type = 0 # MDT_EFFECTIVE_DPI = 0, MDT_ANGULAR_DPI = 1, MDT_RAW_DPI = 2
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window_hwnd = wintypes.HWND(window)
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monitor_handle = windll.user32.MonitorFromWindow(window_hwnd, wintypes.DWORD(2)) # MONITOR_DEFAULTTONEAREST = 2
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x_dpi, y_dpi = wintypes.UINT(), wintypes.UINT()
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windll.shcore.GetDpiForMonitor(monitor_handle, DPI_type, pointer(x_dpi), pointer(y_dpi))
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return (x_dpi.value + y_dpi.value) / (2 * DPI100pc)
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else:
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return 1
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@classmethod
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def check_dpi_scaling(cls):
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# find an existing tkinter object for the next call of .after()
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for root_tk in cls.window_widgets_dict.keys():
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try:
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root_tk.after(500, cls.check_dpi_scaling)
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return
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except Exception:
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continue
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cls.update_loop_running = False
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