CustomTkinter/customtkinter/customtkinter_frame.py

import tkinter
import sys

from .appearance_mode_tracker import AppearanceModeTracker
from .customtkinter_color_manager import CTkColorManager


class CTkFrame(tkinter.Frame):
    def __init__(self, *args,
                 bg_color=None,
                 fg_color=None,
                 corner_radius=10,
                 width=200,
                 height=200,
                 **kwargs):
        super().__init__(*args, **kwargs)

        AppearanceModeTracker.add(self.change_appearance_mode)
        self.appearance_mode = AppearanceModeTracker.get_mode()  # 0: "Light" 1: "Dark"

        self.bg_color = self.detect_color_of_master() if bg_color is None else bg_color

        if fg_color is None:
            if isinstance(self.master, CTkFrame):
                if self.master.fg_color == CTkColorManager.FRAME:
                    self.fg_color = CTkColorManager.FRAME_2
                else:
                    self.fg_color = CTkColorManager.FRAME
            else:
                self.fg_color = CTkColorManager.FRAME
        else:
            self.fg_color = fg_color

        self.width = width
        self.height = height

        self.corner_radius = self.calc_optimal_corner_radius(corner_radius)  # optimise for less artifacts

        if self.corner_radius * 2 > self.height:
            self.corner_radius = self.height / 2
        elif self.corner_radius * 2 > self.width:
            self.corner_radius = self.width / 2

        self.configure(width=self.width, height=self.height)

        self.canvas = tkinter.Canvas(master=self,
                                     highlightthicknes=0,
                                     width=self.width,
                                     height=self.height)
        self.canvas.place(x=0, y=0)

        if type(self.bg_color) == tuple:
            self.canvas.configure(bg=self.bg_color[self.appearance_mode])
        else:
            self.canvas.configure(bg=self.bg_color)

        self.fg_parts = []

        self.draw()

    def detect_color_of_master(self):
        if isinstance(self.master, CTkFrame):
            return self.master.fg_color
        else:
            return self.master.cget("bg")

    @staticmethod
    def calc_optimal_corner_radius(user_corner_radius):
        if sys.platform == "darwin":
            return user_corner_radius  # on macOS just use given value (canvas has Antialiasing)
        else:
            user_corner_radius = 0.5 * round(user_corner_radius / 0.5)  # round to 0.5 steps

            # make sure the value is always with .5 at the end for smoother corners
            if user_corner_radius == 0:
                return 0
            elif user_corner_radius % 1 == 0:
                return user_corner_radius + 0.5
            else:
                return user_corner_radius

    def draw(self):
        for part in self.fg_parts:
            self.canvas.delete(part)
        self.fg_parts = []

        if sys.platform == "darwin":
            oval_size_corr_br = 0
        else:
            oval_size_corr_br = -1  # correct canvas oval draw size on bottom and right by 1 pixel (too large otherwise)

        # frame_border
        self.fg_parts.append(self.canvas.create_oval(0,
                                                     0,
                                                     self.corner_radius*2 + oval_size_corr_br,
                                                     self.corner_radius*2 + oval_size_corr_br))
        self.fg_parts.append(self.canvas.create_oval(self.width-self.corner_radius*2,
                                                     0,
                                                     self.width + oval_size_corr_br,
                                                     self.corner_radius*2 + oval_size_corr_br))
        self.fg_parts.append(self.canvas.create_oval(0,
                                                     self.height-self.corner_radius*2,
                                                     self.corner_radius*2 + oval_size_corr_br,
                                                     self.height + oval_size_corr_br))
        self.fg_parts.append(self.canvas.create_oval(self.width-self.corner_radius*2,
                                                     self.height-self.corner_radius*2,
                                                     self.width + oval_size_corr_br,
                                                     self.height + oval_size_corr_br))

        self.fg_parts.append(self.canvas.create_rectangle(0, self.corner_radius,
                                                          self.width, self.height-self.corner_radius))
        self.fg_parts.append(self.canvas.create_rectangle(self.corner_radius, 0,
                                                          self.width-self.corner_radius, self.height))

        for part in self.fg_parts:
            if type(self.fg_color) == tuple:
                self.canvas.itemconfig(part, fill=self.fg_color[self.appearance_mode], width=0)
            else:
                self.canvas.itemconfig(part, fill=self.fg_color, width=0)

        if type(self.bg_color) == tuple:
            self.canvas.configure(bg=self.bg_color[self.appearance_mode])
        else:
            self.canvas.configure(bg=self.bg_color)

        for part in self.fg_parts:
            self.canvas.tag_lower(part)

    def change_appearance_mode(self, mode_string):
        if mode_string.lower() == "dark":
            self.appearance_mode = 1
        elif mode_string.lower() == "light":
            self.appearance_mode = 0

        if isinstance(self.master, CTkFrame):
            self.bg_color = self.master.fg_color
        else:
            self.bg_color = self.master.cget("bg")

        self.draw()