CustomTkinter/customtkinter/widgets/customtkinter_button.py

import tkinter
import tkinter.ttk as ttk
import sys

from .customtkinter_tk import CTk
from .customtkinter_frame import CTkFrame
from .customtkinter_canvas import CTkCanvas
from customtkinter.appearance_mode_tracker import AppearanceModeTracker
from ..customtkinter_theme_manager import CTkThemeManager
from ..customtkinter_settings import CTkSettings
from ..customtkinter_draw_engine import CTkDrawEngine


class CTkButton(tkinter.Frame):
    """ tkinter custom button with border, rounded corners and hover effect """

    def __init__(self, *args,
                 bg_color=None,
                 fg_color="default_theme",
                 hover_color="default_theme",
                 border_color="default_theme",
                 border_width="default_theme",
                 command=None,
                 textvariable=None,
                 width=120,
                 height=30,
                 corner_radius="default_theme",
                 text_font="default_theme",
                 text_color="default_theme",
                 text_color_disabled="default_theme",
                 text="CTkButton",
                 hover=True,
                 image=None,
                 compound=tkinter.LEFT,
                 state=tkinter.NORMAL,
                 **kwargs):
        super().__init__(*args, **kwargs)

        # overwrite configure methods of master when master is tkinter widget, so that bg changes get applied on child CTk widget too
        if isinstance(self.master, (tkinter.Tk, tkinter.Frame)) and not isinstance(self.master, (CTk, CTkFrame)):
            master_old_configure = self.master.config

            def new_configure(*args, **kwargs):
                if "bg" in kwargs:
                    self.configure(bg_color=kwargs["bg"])
                elif "background" in kwargs:
                    self.configure(bg_color=kwargs["background"])

                # args[0] is dict when attribute gets changed by widget[<attribute>] syntax
                elif len(args) > 0 and type(args[0]) == dict:
                    if "bg" in args[0]:
                        self.configure(bg_color=args[0]["bg"])
                    elif "background" in args[0]:
                        self.configure(bg_color=args[0]["background"])
                master_old_configure(*args, **kwargs)

            self.master.config = new_configure
            self.master.configure = new_configure

        # add set_appearance_mode method to callback list of AppearanceModeTracker for appearance mode changes
        AppearanceModeTracker.add(self.set_appearance_mode, self)
        self.appearance_mode = AppearanceModeTracker.get_mode()  # 0: "Light" 1: "Dark"

        self.configure_basic_grid()

        # color variables
        self.bg_color = self.detect_color_of_master() if bg_color is None else bg_color
        self.fg_color = CTkThemeManager.theme["color"]["button"] if fg_color == "default_theme" else fg_color
        self.hover_color = CTkThemeManager.theme["color"]["button_hover"] if hover_color == "default_theme" else hover_color
        self.border_color = CTkThemeManager.theme["color"]["button_border"] if border_color == "default_theme" else border_color

        # shape and size
        self.width = width
        self.height = height
        self.configure(width=self.width, height=self.height)
        self.corner_radius = CTkThemeManager.theme["shape"]["button_corner_radius"] if corner_radius == "default_theme" else corner_radius
        self.border_width = CTkThemeManager.theme["shape"]["button_border_width"] if border_width == "default_theme" else border_width

        # text and font and image
        self.image = image
        self.image_label = None
        self.text = text
        self.text_label = None
        self.text_color = CTkThemeManager.theme["color"]["text"] if text_color == "default_theme" else text_color
        self.text_color_disabled = CTkThemeManager.theme["color"]["text_button_disabled"] if text_color_disabled == "default_theme" else text_color_disabled
        self.text_font = (CTkThemeManager.theme["text"]["font"], CTkThemeManager.theme["text"]["size"]) if text_font == "default_theme" else text_font

        # callback and hover functionality
        self.function = command
        self.textvariable = textvariable
        self.state = state
        self.hover = hover
        self.compound = compound
        self.click_animation_running = False

        self.canvas = CTkCanvas(master=self,
                                highlightthickness=0,
                                width=self.width,
                                height=self.height)
        self.canvas.grid(row=0, column=0, rowspan=2, columnspan=2, sticky="nsew")

        self.draw_engine = CTkDrawEngine(self.canvas, CTkSettings.preferred_drawing_method)

        # event bindings
        self.canvas.bind("<Enter>", self.on_enter)
        self.canvas.bind("<Leave>", self.on_leave)
        self.canvas.bind("<Button-1>", self.clicked)
        self.canvas.bind("<Button-1>", self.clicked)

        # Each time an item is resized due to pack position mode, the binding Configure is called on the widget
        self.bind('<Configure>', self.update_dimensions)

        self.set_cursor()
        self.draw()  # initial draw

    def destroy(self):
        AppearanceModeTracker.remove(self.set_appearance_mode)
        super().destroy()

    def configure_basic_grid(self):
        # Configuration of a basic grid (2x2) in which all elements of CTkButtons are centered on one row and one column
        self.grid_rowconfigure(0, weight=1)
        self.grid_columnconfigure(0, weight=1)
        self.grid_rowconfigure(1, weight=1)
        self.grid_columnconfigure(1, weight=1)

    def update_dimensions(self, event):
        # only redraw if dimensions changed (for performance)
        if self.width != event.width or self.height != event.height:
            self.width = event.width
            self.height = event.height

            # self.canvas.config(width=self.width, height=self.height)
            self.draw(no_color_updates=True)  # fast drawing without color changes

    def detect_color_of_master(self):
        """ detect color of self.master widget to set correct bg_color """

        if isinstance(self.master, CTkFrame):  # master is CTkFrame
            return self.master.fg_color

        elif isinstance(self.master, (ttk.Frame, ttk.LabelFrame, ttk.Notebook)):  # master is ttk widget
            try:
                ttk_style = ttk.Style()
                return ttk_style.lookup(self.master.winfo_class(), 'background')
            except Exception:
                return "#FFFFFF", "#000000"

        else:  # master is normal tkinter widget
            try:
                return self.master.cget("bg")  # try to get bg color by .cget() method
            except Exception:
                return "#FFFFFF", "#000000"

    def draw(self, no_color_updates=False):
        requires_recoloring = self.draw_engine.draw_rounded_rect_with_border(self.width, self.height, self.corner_radius, self.border_width)

        if no_color_updates is False or requires_recoloring:

            self.canvas.configure(bg=CTkThemeManager.single_color(self.bg_color, self.appearance_mode))

            # set color for the button border parts (outline)
            self.canvas.itemconfig("border_parts",
                                   outline=CTkThemeManager.single_color(self.border_color, self.appearance_mode),
                                   fill=CTkThemeManager.single_color(self.border_color, self.appearance_mode))

            # set color for inner button parts
            if self.fg_color is None:
                self.canvas.itemconfig("inner_parts",
                                       outline=CTkThemeManager.single_color(self.bg_color, self.appearance_mode),
                                       fill=CTkThemeManager.single_color(self.bg_color, self.appearance_mode))
            else:
                self.canvas.itemconfig("inner_parts",
                                       outline=CTkThemeManager.single_color(self.fg_color, self.appearance_mode),
                                       fill=CTkThemeManager.single_color(self.fg_color, self.appearance_mode))

        # create text label if text given
        if self.text is not None and self.text != "":

            if self.text_label is None:
                self.text_label = tkinter.Label(master=self, font=self.text_font, textvariable=self.textvariable)

                self.text_label.bind("<Enter>", self.on_enter)
                self.text_label.bind("<Leave>", self.on_leave)
                self.text_label.bind("<Button-1>", self.clicked)
                self.text_label.bind("<Button-1>", self.clicked)

            if no_color_updates is False:
                # set text_label fg color (text color)
                self.text_label.configure(fg=CTkThemeManager.single_color(self.text_color, self.appearance_mode))

                if self.state == tkinter.DISABLED:
                    self.text_label.configure(fg=(CTkThemeManager.single_color(self.text_color_disabled, self.appearance_mode)))
                else:
                    self.text_label.configure(fg=CTkThemeManager.single_color(self.text_color, self.appearance_mode))

                if self.fg_color is None:
                    self.text_label.configure(bg=CTkThemeManager.single_color(self.bg_color, self.appearance_mode))
                else:
                    self.text_label.configure(bg=CTkThemeManager.single_color(self.fg_color, self.appearance_mode))

            self.text_label.configure(text=self.text)  # set text

        else:
            # delete text_label if no text given
            if self.text_label is not None:
                self.text_label.destroy()
                self.text_label = None

        # create image label if image given
        if self.image is not None:

            if self.image_label is None:
                self.image_label = tkinter.Label(master=self)

                self.image_label.bind("<Enter>", self.on_enter)
                self.image_label.bind("<Leave>", self.on_leave)
                self.image_label.bind("<Button-1>", self.clicked)
                self.image_label.bind("<Button-1>", self.clicked)

            if no_color_updates is False:
                # set image_label bg color (background color of label)
                if self.fg_color is None:
                    self.image_label.configure(bg=CTkThemeManager.single_color(self.bg_color, self.appearance_mode))
                else:
                    self.image_label.configure(bg=CTkThemeManager.single_color(self.fg_color, self.appearance_mode))

            self.image_label.configure(image=self.image)  # set image

        else:
            # delete text_label if no text given
            if self.image_label is not None:
                self.image_label.destroy()
                self.image_label = None

        # create grid layout with just an image given
        if self.image_label is not None and self.text_label is None:
            self.image_label.grid(row=0, column=0, rowspan=2, columnspan=2, sticky="", pady=self.border_width)

        # create grid layout with just text given
        if self.image_label is None and self.text_label is not None:
            self.text_label.grid(row=0, column=0, padx=self.corner_radius, pady=self.border_width, rowspan=2, columnspan=2, sticky="")

        # create grid layout of image and text label in 2x2 grid system with given compound
        if self.image_label is not None and self.text_label is not None:
            if self.compound == tkinter.LEFT or self.compound == "left":
                self.image_label.grid(row=0, column=0, padx=(max(self.corner_radius, self.border_width), 2), sticky="e", rowspan=2, columnspan=1, pady=self.border_width)
                self.text_label.grid(row=0, column=1, padx=(2, max(self.corner_radius, self.border_width)), sticky="w", rowspan=2, columnspan=1, pady=self.border_width)
            elif self.compound == tkinter.TOP or self.compound == "top":
                self.image_label.grid(row=0, column=0, padx=max(self.corner_radius, self.border_width), sticky="s", columnspan=2, rowspan=1, pady=(self.border_width, 2))
                self.text_label.grid(row=1, column=0, padx=max(self.corner_radius, self.border_width), sticky="n", columnspan=2, rowspan=1, pady=(2, self.border_width))
            elif self.compound == tkinter.RIGHT or self.compound == "right":
                self.image_label.grid(row=0, column=1, padx=(2, max(self.corner_radius, self.border_width)), sticky="w", rowspan=2, columnspan=1, pady=self.border_width)
                self.text_label.grid(row=0, column=0, padx=(max(self.corner_radius, self.border_width), 2), sticky="e", rowspan=2, columnspan=1, pady=self.border_width)
            elif self.compound == tkinter.BOTTOM or self.compound == "bottom":
                self.image_label.grid(row=1, column=0, padx=max(self.corner_radius, self.border_width), sticky="n", columnspan=2, rowspan=1, pady=(2, self.border_width))
                self.text_label.grid(row=0, column=0, padx=max(self.corner_radius, self.border_width), sticky="s", columnspan=2, rowspan=1, pady=(self.border_width, 2))

    def config(self, *args, **kwargs):
        self.configure(*args, **kwargs)

    def configure(self, *args, **kwargs):
        require_redraw = False  # some attribute changes require a call of self.draw() at the end

        if "text" in kwargs:
            self.set_text(kwargs["text"])
            del kwargs["text"]

        if "state" in kwargs:
            self.state = kwargs["state"]
            self.set_cursor()
            require_redraw = True
            del kwargs["state"]

        if "image" in kwargs:
            self.set_image(kwargs["image"])
            del kwargs["image"]

        if "compound" in kwargs:
            self.compound = kwargs["compound"]
            require_redraw = True
            del kwargs["compound"]

        if "fg_color" in kwargs:
            self.fg_color = kwargs["fg_color"]
            require_redraw = True
            del kwargs["fg_color"]

        if "border_color" in kwargs:
            self.border_color = kwargs["border_color"]
            require_redraw = True
            del kwargs["border_color"]

        if "bg_color" in kwargs:
            if kwargs["bg_color"] is None:
                self.bg_color = self.detect_color_of_master()
            else:
                self.bg_color = kwargs["bg_color"]
            require_redraw = True
            del kwargs["bg_color"]

        if "hover_color" in kwargs:
            self.hover_color = kwargs["hover_color"]
            require_redraw = True
            del kwargs["hover_color"]

        if "text_color" in kwargs:
            self.text_color = kwargs["text_color"]
            require_redraw = True
            del kwargs["text_color"]

        if "command" in kwargs:
            self.function = kwargs["command"]
            del kwargs["command"]

        if "textvariable" in kwargs:
            self.textvariable = kwargs["textvariable"]
            if self.text_label is not None:
                self.text_label.configure(textvariable=self.textvariable)
            del kwargs["textvariable"]

        super().configure(*args, **kwargs)

        if require_redraw:
            self.draw()

    def set_cursor(self):
        if self.state == tkinter.DISABLED:
            if sys.platform == "darwin" and self.function is not None and CTkSettings.hand_cursor_enabled:
                self.configure(cursor="arrow")
            elif sys.platform.startswith("win") and self.function is not None and CTkSettings.hand_cursor_enabled:
                self.configure(cursor="arrow")

        elif self.state == tkinter.NORMAL:
            if sys.platform == "darwin" and self.function is not None and CTkSettings.hand_cursor_enabled:
                self.configure(cursor="pointinghand")
            elif sys.platform.startswith("win") and self.function is not None and CTkSettings.hand_cursor_enabled:
                self.configure(cursor="hand2")

    def set_text(self, text):
        self.text = text
        self.draw()

    def set_image(self, image):
        self.image = image
        self.draw()

    def on_enter(self, event=0):
        if self.hover is True and self.state == tkinter.NORMAL:
            if self.hover_color is None:
                inner_parts_color = self.fg_color
            else:
                inner_parts_color = self.hover_color

            # set color of inner button parts to hover color
            self.canvas.itemconfig("inner_parts",
                                   outline=CTkThemeManager.single_color(inner_parts_color, self.appearance_mode),
                                   fill=CTkThemeManager.single_color(inner_parts_color, self.appearance_mode))

            # set text_label bg color to button hover color
            if self.text_label is not None:
                self.text_label.configure(bg=CTkThemeManager.single_color(inner_parts_color, self.appearance_mode))

            # set image_label bg color to button hover color
            if self.image_label is not None:
                self.image_label.configure(bg=CTkThemeManager.single_color(inner_parts_color, self.appearance_mode))

    def on_leave(self, event=0):
        self.click_animation_running = False

        if self.hover is True:
            if self.fg_color is None:
                inner_parts_color = self.bg_color
            else:
                inner_parts_color = self.fg_color

            # set color of inner button parts
            self.canvas.itemconfig("inner_parts",
                                   outline=CTkThemeManager.single_color(inner_parts_color, self.appearance_mode),
                                   fill=CTkThemeManager.single_color(inner_parts_color, self.appearance_mode))

            # set text_label bg color (label color)
            if self.text_label is not None:
                self.text_label.configure(bg=CTkThemeManager.single_color(inner_parts_color, self.appearance_mode))

            # set image_label bg color (image bg color)
            if self.image_label is not None:
                self.image_label.configure(bg=CTkThemeManager.single_color(inner_parts_color, self.appearance_mode))

    def click_animation(self):
        if self.click_animation_running:
            self.on_enter()

    def clicked(self, event=0):
        if self.function is not None:
            if self.state is not tkinter.DISABLED:

                # click animation: change color with .on_leave() and back to normal after 100ms with click_animation()
                self.on_leave()
                self.click_animation_running = True
                self.after(100, self.click_animation)

                self.function()

    def set_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, CTk)):
            self.bg_color = self.master.fg_color
        else:
            self.bg_color = self.master.cget("bg")

        self.draw()