Dark Title Bar In Windows

[dipeshSam]

While it may deviate from the core philosophy of Flet building, the integration of a darkened title bar, a standard feature within Windows, notably in Windows 11, is within the realm of possibility for developers. This functionality holds the potential to attract a broader audience, particularly among fervent Windows enthusiasts. In the context of Tkinter, specifically customtkinter, as well as other versatile GUI libraries and the C++ development environment for Windows, various mechanisms exist to facilitate the darkening of the title bar.

In customtkinter, and other same libraries can make the title bar dark using following appropriate approach:

def _windows_set_titlebar_color(self, color_mode: str):
        """
        Set the titlebar color of the window to light or dark theme on Microsoft Windows.

        Credits for this function:
        https://stackoverflow.com/questions/23836000/can-i-change-the-title-bar-in-tkinter/70724666#70724666

        MORE INFO:
        https://docs.microsoft.com/en-us/windows/win32/api/dwmapi/ne-dwmapi-dwmwindowattribute
        """

        if sys.platform.startswith("win") and not self._deactivate_windows_window_header_manipulation:

            if self._window_exists:
                self._state_before_windows_set_titlebar_color = self.state()
                # print("window_exists -> state_before_windows_set_titlebar_color: ", self.state_before_windows_set_titlebar_color)

                if self._state_before_windows_set_titlebar_color != "iconic" or self._state_before_windows_set_titlebar_color != "withdrawn":
                    self.focused_widget_before_widthdraw = self.focus_get()
                    super().withdraw()  # hide window so that it can be redrawn after the titlebar change so that the color change is visible
            else:
                # print("window dont exists -> withdraw and update")
                self.focused_widget_before_widthdraw = self.focus_get()
                super().withdraw()
                super().update()

            if color_mode.lower() == "dark":
                value = 1
            elif color_mode.lower() == "light":
                value = 0
            else:
                return

            try:
                hwnd = ctypes.windll.user32.GetParent(self.winfo_id())
                DWMWA_USE_IMMERSIVE_DARK_MODE = 20
                DWMWA_USE_IMMERSIVE_DARK_MODE_BEFORE_20H1 = 19

                # try with DWMWA_USE_IMMERSIVE_DARK_MODE
                if ctypes.windll.dwmapi.DwmSetWindowAttribute(hwnd, DWMWA_USE_IMMERSIVE_DARK_MODE,
                                                              ctypes.byref(ctypes.c_int(value)),
                                                              ctypes.sizeof(ctypes.c_int(value))) != 0:

                    # try with DWMWA_USE_IMMERSIVE_DARK_MODE_BEFORE_20h1
                    ctypes.windll.dwmapi.DwmSetWindowAttribute(hwnd, DWMWA_USE_IMMERSIVE_DARK_MODE_BEFORE_20H1,
                                                               ctypes.byref(ctypes.c_int(value)),
                                                               ctypes.sizeof(ctypes.c_int(value)))

            except Exception as err:
                print(err)

            if self._window_exists or True:
                # print("window_exists -> return to original state: ", self.state_before_windows_set_titlebar_color)
                if self._state_before_windows_set_titlebar_color == "normal":
                    self.deiconify()
                elif self._state_before_windows_set_titlebar_color == "iconic":
                    self.iconify()
                elif self._state_before_windows_set_titlebar_color == "zoomed":
                    self.state("zoomed")
                else:
                    self.state(self._state_before_windows_set_titlebar_color)  # other states
            else:
                pass  # wait for update or mainloop to be called

            if self.focused_widget_before_widthdraw is not None:
                self.after(1, self.focused_widget_before_widthdraw.focus)
                self.focused_widget_before_widthdraw = None