CustomTkinter/customtkinter/widgets/ctk_slider.py

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import tkinter
import sys
from typing import Union, Tuple, Callable
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from .ctk_canvas import CTkCanvas
from ..theme_manager import ThemeManager
from ..settings import Settings
from ..draw_engine import DrawEngine
from .widget_base_class import CTkBaseClass
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class CTkSlider(CTkBaseClass):
"""
Slider with rounded corners, border, number of steps, variable support, vertical orientation.
For detailed information check out the documentation.
"""
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def __init__(self, *args,
width: Union[int, str] = "default_init",
height: Union[int, str] = "default_init",
corner_radius: Union[int, str] = "default_theme",
button_corner_radius: Union[int, str] = "default_theme",
border_width: Union[int, str] = "default_theme",
button_length: Union[int, str] = "default_theme",
bg_color: Union[str, Tuple[str, str], None] = None,
fg_color: Union[str, Tuple[str, str]] = "default_theme",
border_color: Union[str, Tuple[str, str], None] = None,
progress_color: Union[str, Tuple[str, str], None] = "default_theme",
button_color: Union[str, Tuple[str, str]] = "default_theme",
button_hover_color: Union[str, Tuple[str, str]] = "default_theme",
from_: int = 0,
to: int = 1,
state: str = "normal",
number_of_steps: Union[int, None] = None,
command: Callable = None,
variable: tkinter.Variable = None,
orientation: str = "horizontal",
**kwargs):
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# set default dimensions according to orientation
if width == "default_init":
if orientation.lower() == "vertical":
width = 16
else:
width = 200
if height == "default_init":
if orientation.lower() == "vertical":
height = 200
else:
height = 16
# transfer basic functionality (_bg_color, size, _appearance_mode, scaling) to CTkBaseClass
super().__init__(*args, bg_color=bg_color, width=width, height=height, **kwargs)
# color
self._border_color = border_color
self._fg_color = ThemeManager.theme["color"]["slider"] if fg_color == "default_theme" else fg_color
self._progress_color = ThemeManager.theme["color"]["slider_progress"] if progress_color == "default_theme" else progress_color
self._button_color = ThemeManager.theme["color"]["slider_button"] if button_color == "default_theme" else button_color
self._button_hover_color = ThemeManager.theme["color"]["slider_button_hover"] if button_hover_color == "default_theme" else button_hover_color
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# shape
self._corner_radius = ThemeManager.theme["shape"]["slider_corner_radius"] if corner_radius == "default_theme" else corner_radius
self._button_corner_radius = ThemeManager.theme["shape"]["slider_button_corner_radius"] if button_corner_radius == "default_theme" else button_corner_radius
self._border_width = ThemeManager.theme["shape"]["slider_border_width"] if border_width == "default_theme" else border_width
self._button_length = ThemeManager.theme["shape"]["slider_button_length"] if button_length == "default_theme" else button_length
self._value: float = 0.5 # initial value of slider in percent
self._orientation = orientation
self._hover_state: bool = False
self._from_ = from_
self._to = to
self._number_of_steps = number_of_steps
self._output_value = self._from_ + (self._value * (self._to - self._from_))
if self._corner_radius < self._button_corner_radius:
self._corner_radius = self._button_corner_radius
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# callback and control variables
self._command = command
self._variable: tkinter.Variable = variable
self._variable_callback_blocked: bool = False
self._variable_callback_name: Union[bool, None] = None
self._state = state
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self.grid_rowconfigure(0, weight=1)
self.grid_columnconfigure(0, weight=1)
self._canvas = CTkCanvas(master=self,
highlightthickness=0,
width=self._apply_widget_scaling(self._desired_width),
height=self._apply_widget_scaling(self._desired_height))
self._canvas.grid(column=0, row=0, rowspan=1, columnspan=1, sticky="nswe")
self._draw_engine = DrawEngine(self._canvas)
self._canvas.bind("<Enter>", self._on_enter)
self._canvas.bind("<Leave>", self._on_leave)
self._canvas.bind("<Button-1>", self._clicked)
self._canvas.bind("<B1-Motion>", self._clicked)
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# Each time an item is resized due to pack position mode, the binding Configure is called on the widget
super().bind('<Configure>', self._update_dimensions_event)
self._set_cursor()
self._draw() # initial draw
if self._variable is not None:
self._variable_callback_name = self._variable.trace_add("write", self._variable_callback)
self._variable_callback_blocked = True
self.set(self._variable.get(), from_variable_callback=True)
self._variable_callback_blocked = False
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def _set_scaling(self, *args, **kwargs):
super()._set_scaling(*args, **kwargs)
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self._canvas.configure(width=self._apply_widget_scaling(self._desired_width),
height=self._apply_widget_scaling(self._desired_height))
self._draw()
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def _set_dimensions(self, width=None, height=None):
super()._set_dimensions(width, height)
self._canvas.configure(width=self._apply_widget_scaling(self._desired_width),
height=self._apply_widget_scaling(self._desired_height))
self._draw()
def destroy(self):
# remove variable_callback from variable callbacks if variable exists
if self._variable is not None:
self._variable.trace_remove("write", self._variable_callback_name)
super().destroy()
def _set_cursor(self):
if self._state == "normal" and Settings.cursor_manipulation_enabled:
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if sys.platform == "darwin":
self.configure(cursor="pointinghand")
elif sys.platform.startswith("win"):
self.configure(cursor="hand2")
elif self._state == "disabled" and Settings.cursor_manipulation_enabled:
if sys.platform == "darwin":
self.configure(cursor="arrow")
elif sys.platform.startswith("win"):
self.configure(cursor="arrow")
def _draw(self, no_color_updates=False):
if self._orientation.lower() == "horizontal":
orientation = "w"
elif self._orientation.lower() == "vertical":
orientation = "s"
else:
orientation = "w"
requires_recoloring = self._draw_engine.draw_rounded_slider_with_border_and_button(self._apply_widget_scaling(self._current_width),
self._apply_widget_scaling(self._current_height),
self._apply_widget_scaling(self._corner_radius),
self._apply_widget_scaling(self._border_width),
self._apply_widget_scaling(self._button_length),
self._apply_widget_scaling(self._button_corner_radius),
self._value, orientation)
if no_color_updates is False or requires_recoloring:
self._canvas.configure(bg=ThemeManager.single_color(self._bg_color, self._appearance_mode))
if self._border_color is None:
self._canvas.itemconfig("border_parts", fill=ThemeManager.single_color(self._bg_color, self._appearance_mode),
outline=ThemeManager.single_color(self._bg_color, self._appearance_mode))
else:
self._canvas.itemconfig("border_parts", fill=ThemeManager.single_color(self._border_color, self._appearance_mode),
outline=ThemeManager.single_color(self._border_color, self._appearance_mode))
self._canvas.itemconfig("inner_parts", fill=ThemeManager.single_color(self._fg_color, self._appearance_mode),
outline=ThemeManager.single_color(self._fg_color, self._appearance_mode))
if self._progress_color is None:
self._canvas.itemconfig("progress_parts", fill=ThemeManager.single_color(self._fg_color, self._appearance_mode),
outline=ThemeManager.single_color(self._fg_color, self._appearance_mode))
else:
self._canvas.itemconfig("progress_parts", fill=ThemeManager.single_color(self._progress_color, self._appearance_mode),
outline=ThemeManager.single_color(self._progress_color, self._appearance_mode))
if self._hover_state is True:
self._canvas.itemconfig("slider_parts",
fill=ThemeManager.single_color(self._button_hover_color, self._appearance_mode),
outline=ThemeManager.single_color(self._button_hover_color, self._appearance_mode))
else:
self._canvas.itemconfig("slider_parts",
fill=ThemeManager.single_color(self._button_color, self._appearance_mode),
outline=ThemeManager.single_color(self._button_color, self._appearance_mode))
def configure(self, require_redraw=False, **kwargs):
if "state" in kwargs:
self._state = kwargs.pop("state")
self._set_cursor()
require_redraw = True
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if "fg_color" in kwargs:
self._fg_color = kwargs.pop("fg_color")
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require_redraw = True
if "progress_color" in kwargs:
self._progress_color = kwargs.pop("progress_color")
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require_redraw = True
if "button_color" in kwargs:
self._button_color = kwargs.pop("button_color")
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require_redraw = True
if "button_hover_color" in kwargs:
self._button_hover_color = kwargs.pop("button_hover_color")
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require_redraw = True
if "border_color" in kwargs:
self._border_color = kwargs.pop("border_color")
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require_redraw = True
if "border_width" in kwargs:
self._border_width = kwargs.pop("border_width")
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require_redraw = True
if "from_" in kwargs:
self._from_ = kwargs.pop("from_")
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if "to" in kwargs:
self._to = kwargs.pop("to")
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if "number_of_steps" in kwargs:
self._number_of_steps = kwargs.pop("number_of_steps")
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if "command" in kwargs:
self._command = kwargs.pop("command")
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if "variable" in kwargs:
if self._variable is not None:
self._variable.trace_remove("write", self._variable_callback_name)
self._variable = kwargs.pop("variable")
if self._variable is not None and self._variable != "":
self._variable_callback_name = self._variable.trace_add("write", self._variable_callback)
self.set(self._variable.get(), from_variable_callback=True)
else:
self._variable = None
if "width" in kwargs:
self._set_dimensions(width=kwargs.pop("width"))
if "height" in kwargs:
self._set_dimensions(height=kwargs.pop("height"))
super().configure(require_redraw=require_redraw, **kwargs)
def cget(self, attribute_name: str) -> any:
if attribute_name == "corner_radius":
return self._corner_radius
elif attribute_name == "button_corner_radius":
return self._button_corner_radius
elif attribute_name == "border_width":
return self._border_width
elif attribute_name == "button_length":
return self._button_length
elif attribute_name == "fg_color":
return self._fg_color
elif attribute_name == "border_color":
return self._border_color
elif attribute_name == "progress_color":
return self._progress_color
elif attribute_name == "button_color":
return self._button_color
elif attribute_name == "button_hover_color":
return self._button_hover_color
elif attribute_name == "from_":
return self._from_
elif attribute_name == "to":
return self._to
elif attribute_name == "state":
return self._state
elif attribute_name == "number_of_steps":
return self._number_of_steps
elif attribute_name == "command":
return self._command
elif attribute_name == "variable":
return self._variable
elif attribute_name == "orientation":
return self._orientation
else:
return super().cget(attribute_name)
def _clicked(self, event=None):
if self._state == "normal":
if self._orientation.lower() == "horizontal":
self._value = (event.x / self._current_width) / self._widget_scaling
else:
self._value = 1 - (event.y / self._current_height) / self._widget_scaling
if self._value > 1:
self._value = 1
if self._value < 0:
self._value = 0
self._output_value = self._round_to_step_size(self._from_ + (self._value * (self._to - self._from_)))
self._value = (self._output_value - self._from_) / (self._to - self._from_)
self._draw(no_color_updates=False)
if self._variable is not None:
self._variable_callback_blocked = True
self._variable.set(round(self._output_value) if isinstance(self._variable, tkinter.IntVar) else self._output_value)
self._variable_callback_blocked = False
if self._command is not None:
self._command(self._output_value)
def _on_enter(self, event=0):
if self._state == "normal":
self._hover_state = True
self._canvas.itemconfig("slider_parts",
fill=ThemeManager.single_color(self._button_hover_color, self._appearance_mode),
outline=ThemeManager.single_color(self._button_hover_color, self._appearance_mode))
def _on_leave(self, event=0):
self._hover_state = False
self._canvas.itemconfig("slider_parts",
fill=ThemeManager.single_color(self._button_color, self._appearance_mode),
outline=ThemeManager.single_color(self._button_color, self._appearance_mode))
def _round_to_step_size(self, value) -> float:
if self._number_of_steps is not None:
step_size = (self._to - self._from_) / self._number_of_steps
value = self._to - (round((self._to - value) / step_size) * step_size)
return value
else:
return value
def get(self) -> float:
return self._output_value
def set(self, output_value, from_variable_callback=False):
if self._from_ < self._to:
if output_value > self._to:
output_value = self._to
elif output_value < self._from_:
output_value = self._from_
else:
if output_value < self._to:
output_value = self._to
elif output_value > self._from_:
output_value = self._from_
self._output_value = self._round_to_step_size(output_value)
self._value = (self._output_value - self._from_) / (self._to - self._from_)
self._draw(no_color_updates=False)
if self._variable is not None and not from_variable_callback:
self._variable_callback_blocked = True
self._variable.set(round(self._output_value) if isinstance(self._variable, tkinter.IntVar) else self._output_value)
self._variable_callback_blocked = False
def _variable_callback(self, var_name, index, mode):
if not self._variable_callback_blocked:
self.set(self._variable.get(), from_variable_callback=True)
def bind(self, sequence=None, command=None, add=None):
""" called on the tkinter.Canvas """
return self._canvas.bind(sequence, command, add)
def unbind(self, sequence, funcid=None):
""" called on the tkinter.Canvas """
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return self._canvas.unbind(sequence, funcid)