Create new widgets (Spinbox)

If you want to create new widgets by yourself, because you need something that's not implemented with Customtkinter, you can easily do this. In the following I created a Spinbox based on float values.

First you create a new class, that inherits from customtkinter.CTkFrame:

import customtkinter

class WidgetName(customtkinter.CTkFrame):
    def __init__(self, *args,
                 width: int = 100,
                 height: int = 32,
                 **kwargs):
        super().__init__(*args, width=width, height=height, **kwargs)

By doing this, you already have a widget that has a default size given by the default values of the attributes width and height. And it also supports all attributes of a CTkFrame like fg_color and corner_radius.

A simple implementation af a float based Spinbox could look like the following:

class FloatSpinbox(customtkinter.CTkFrame):
    def __init__(self, *args,
                 width: int = 100,
                 height: int = 32,
                 step_size: Union[int, float] = 1,
                 command: Callable = None,
                 **kwargs):
        super().__init__(*args, width=width, height=height, **kwargs)

        self.step_size = step_size
        self.command = command

        self.configure(fg_color=("gray78", "gray28"))  # set frame color

        self.grid_columnconfigure((0, 2), weight=0)  # buttons don't expand
        self.grid_columnconfigure(1, weight=1)  # entry expands

        self.subtract_button = customtkinter.CTkButton(self, text="-", width=height-6, height=height-6,
                                                       command=self.subtract_button_callback)
        self.subtract_button.grid(row=0, column=0, padx=(3, 0), pady=3)

        self.entry = customtkinter.CTkEntry(self, width=width-(2*height), height=height-6, border_width=0)
        self.entry.grid(row=0, column=1, columnspan=1, padx=3, pady=3, sticky="ew")

        self.add_button = customtkinter.CTkButton(self, text="+", width=height-6, height=height-6,
                                                  command=self.add_button_callback)
        self.add_button.grid(row=0, column=2, padx=(0, 3), pady=3)

        # default value
        self.entry.insert(0, "0.0")

    def add_button_callback(self):
        if self.command is not None:
            self.command()
        try:
            value = float(self.entry.get()) + self.step_size
            self.entry.delete(0, "end")
            self.entry.insert(0, value)
        except ValueError:
            return

    def subtract_button_callback(self):
        if self.command is not None:
            self.command()
        try:
            value = float(self.entry.get()) - self.step_size
            self.entry.delete(0, "end")
            self.entry.insert(0, value)
        except ValueError:
            return

    def get(self) -> Union[float, None]:
        try:
            return float(self.entry.get())
        except ValueError:
            return None

    def set(self, value: float):
        self.entry.delete(0, "end")
        self.entry.insert(0, str(float(value)))

Of course you could add a configure method or more attributes to configure the colors in the init method.

But with the above implementation you can use the spin box like the following:

app = customtkinter.CTk()

spinbox_1 = FloatSpinbox(app, width=150, step_size=3)
spinbox_1.pack(padx=20, pady=20)

spinbox_1.set(35)
print(spinbox_1.get())

app.mainloop()