Merge branch 'test_scaling'

# Conflicts:
#	customtkinter/widgets/ctk_button.py
#	customtkinter/widgets/ctk_checkbox.py
#	customtkinter/widgets/ctk_entry.py
#	customtkinter/widgets/ctk_label.py
#	customtkinter/widgets/ctk_progressbar.py
#	customtkinter/widgets/ctk_radiobutton.py
#	customtkinter/widgets/ctk_slider.py
#	customtkinter/widgets/ctk_switch.py
#	customtkinter/widgets/customtkinter_frame.py

customtkinter/__init__.py

@@ -16,7 +16,7 @@ from .widgets.ctk_toplevel import CTkToplevel
 
 from .customtkinter_settings import CTkSettings
 from .appearance_mode_tracker import AppearanceModeTracker
-from .customtkinter_theme_manager import CTkThemeManager
+from .theme_manager import CTkThemeManager
 
 from distutils.version import StrictVersion as Version
 import tkinter

customtkinter/customtkinter_settings.py

@@ -3,11 +3,9 @@ import sys
 
 class CTkSettings:
 
-    scaling_factor = 1
     circle_font_is_ready = False
     hand_cursor_enabled = True
     preferred_drawing_method = None
-
     radius_to_char_fine = None
 
     @classmethod
@@ -42,7 +40,6 @@ class CTkSettings:
     @classmethod
     def print_settings(cls):
         print(f"CTkSettings current values:")
-        print(f"scaling_factor = {cls.scaling_factor}")
         print(f"circle_font_is_ready = {cls.circle_font_is_ready}")
         print(f"hand_cursor_enabled = {cls.hand_cursor_enabled}")
         print(f"preferred_drawing_method = {cls.preferred_drawing_method}")

customtkinter/scaling_tracker.py

@@ -0,0 +1,100 @@
+import tkinter
+import sys
+
+
+class ScalingTracker:
+
+    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 DPI values
+    user_scaling = 1  # scale change of all widgets and windows
+
+    update_loop_running = False
+
+    @classmethod
+    def get_widget_scaling(cls, widget):
+        window_root = cls.get_window_root_of_widget(widget)
+        return cls.window_dpi_scaling_dict[window_root] * cls.user_scaling
+
+    @classmethod
+    def get_window_scaling(cls, window):
+        return cls.window_dpi_scaling_dict[window] * cls.user_scaling
+
+    @classmethod
+    def set_user_scaling(cls, user_scaling_factor):
+        cls.user_scaling = user_scaling_factor
+        cls.update_scaling_callbacks()
+
+    @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(cls):
+        for window, callback_list in cls.window_widgets_dict.items():
+            for callback in callback_list:
+                callback(cls.window_dpi_scaling_dict[window])
+
+    @classmethod
+    def add_widget(cls, widget_callback, 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_value(window_root)
+
+        if not cls.update_loop_running:
+            window_root.after(100, cls.check_dpi_scaling)
+            cls.update_loop_running = True
+
+    @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_value(window)
+
+    @classmethod
+    def get_window_dpi_value(cls, window):
+        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)
+            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
+
+    @classmethod
+    def check_dpi_scaling(cls):
+        # find an existing tkinter object for the next call of .after()
+        for root_tk in cls.window_widgets_dict.keys():
+            try:
+                root_tk.after(500, cls.check_dpi_scaling)
+                return
+            except Exception:
+                continue
+
+        cls.update_loop_running = False
+

customtkinter/widgets/ctk_input_dialog.py

@@ -7,7 +7,7 @@ from .ctk_frame import CTkFrame
 from .ctk_toplevel import CTkToplevel
 from .ctk_button import CTkButton
 from ..appearance_mode_tracker import AppearanceModeTracker
-from ..customtkinter_theme_manager import CTkThemeManager
+from ..theme_manager import CTkThemeManager
 
 
 class CTkInputDialog:

customtkinter/widgets/ctk_tk.py

@@ -6,7 +6,7 @@ import platform
 import ctypes
 
 from ..appearance_mode_tracker import AppearanceModeTracker
-from ..customtkinter_theme_manager import CTkThemeManager
+from ..theme_manager import CTkThemeManager
 
 
 class CTk(tkinter.Tk):

customtkinter/widgets/ctk_toplevel.py

@@ -6,7 +6,7 @@ import platform
 import ctypes
 
 from ..appearance_mode_tracker import AppearanceModeTracker
-from ..customtkinter_theme_manager import CTkThemeManager
+from ..theme_manager import CTkThemeManager
 
 
 class CTkToplevel(tkinter.Toplevel):

test/test_ctk_toplevel.py

@@ -15,6 +15,8 @@ class ExampleApp(customtkinter.CTk):
         window = customtkinter.CTkToplevel(self)
         window.geometry("400x200")
 
+        print(window.master.winfo_class())
+
         label = customtkinter.CTkLabel(window, text="CTkToplevel window")
         label.pack(side="top", fill="both", expand=True, padx=40, pady=40)