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import tkinter
import sys
from typing import Union, Tuple, Callable, Optional
from .core_rendering import CTkCanvas
from .theme import ThemeManager
from .core_rendering import DrawEngine
from .core_widget_classes import CTkBaseClass
class CTkSlider(CTkBaseClass):
"""
Slider with rounded corners, border, number of steps, variable support, vertical orientation.
For detailed information check out the documentation.
"""
def __init__(self,
master: any,
width: Optional[int] = None,
height: Optional[int] = None,
corner_radius: Optional[int] = None,
button_corner_radius: Optional[int] = None,
border_width: Optional[int] = None,
button_length: Optional[int] = None,
bg_color: Union[str, Tuple[str, str]] = "transparent",
fg_color: Optional[Union[str, Tuple[str, str]]] = None,
border_color: Union[str, Tuple[str, str]] = "transparent",
progress_color: Optional[Union[str, Tuple[str, str]]] = None,
button_color: Optional[Union[str, Tuple[str, str]]] = None,
button_hover_color: Optional[Union[str, Tuple[str, str]]] = None,
from_: int = 0,
to: int = 1,
state: str = "normal",
number_of_steps: Union[int, None] = None,
hover: bool = True,
command: Union[Callable[[float], None], None] = None,
variable: Union[tkinter.Variable, None] = None,
orientation: str = "horizontal",
**kwargs):
# set default dimensions according to orientation
if width is None:
if orientation.lower() == "vertical":
width = 16
else:
width = 200
if height is None:
if orientation.lower() == "vertical":
height = 200
else:
height = 16
# transfer basic functionality (_bg_color, size, __appearance_mode, scaling) to CTkBaseClass
super().__init__(master=master, bg_color=bg_color, width=width, height=height, **kwargs)
# color
self._border_color = self._check_color_type(border_color, transparency=True)
self._fg_color = ThemeManager.theme["CTkSlider"]["fg_color"] if fg_color is None else self._check_color_type(fg_color)
self._progress_color = ThemeManager.theme["CTkSlider"]["progress_color"] if progress_color is None else self._check_color_type(progress_color, transparency=True)
self._button_color = ThemeManager.theme["CTkSlider"]["button_color"] if button_color is None else self._check_color_type(button_color)
self._button_hover_color = ThemeManager.theme["CTkSlider"]["button_hover_color"] if button_hover_color is None else self._check_color_type(button_hover_color)
# shape
self._corner_radius = ThemeManager.theme["CTkSlider"]["corner_radius"] if corner_radius is None else corner_radius
self._button_corner_radius = ThemeManager.theme["CTkSlider"]["button_corner_radius"] if button_corner_radius is None else button_corner_radius
self._border_width = ThemeManager.theme["CTkSlider"]["border_width"] if border_width is None else border_width
self._button_length = ThemeManager.theme["CTkSlider"]["button_length"] if button_length is None else button_length
self._value: float = 0.5 # initial value of slider in percent
self._orientation = orientation
self._hover_state: bool = False
self._hover = hover
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
# 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
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._create_bindings()
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
def _create_bindings(self, sequence: Optional[str] = None):
""" set necessary bindings for functionality of widget, will overwrite other bindings """
if sequence is None or sequence == "<Enter>":
self._canvas.bind("<Enter>", self._on_enter)
if sequence is None or sequence == "<Leave>":
self._canvas.bind("<Leave>", self._on_leave)
if sequence is None or sequence == "<Button-1>":
self._canvas.bind("<Button-1>", self._clicked)
if sequence is None or sequence == "<B1-Motion>":
self._canvas.bind("<B1-Motion>", self._clicked)
def _set_scaling(self, *args, **kwargs):
super()._set_scaling(*args, **kwargs)
self._canvas.configure(width=self._apply_widget_scaling(self._desired_width),
height=self._apply_widget_scaling(self._desired_height))
self._draw(no_color_updates=True)
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 self._cursor_manipulation_enabled:
if sys.platform == "darwin":
self.configure(cursor="pointinghand")
elif sys.platform.startswith("win"):
self.configure(cursor="hand2")
elif self._state == "disabled" and self._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):
super()._draw(no_color_updates)
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=self._apply_appearance_mode(self._bg_color))
if self._border_color == "transparent":
self._canvas.itemconfig("border_parts", fill=self._apply_appearance_mode(self._bg_color),
outline=self._apply_appearance_mode(self._bg_color))
else:
self._canvas.itemconfig("border_parts", fill=self._apply_appearance_mode(self._border_color),
outline=self._apply_appearance_mode(self._border_color))
self._canvas.itemconfig("inner_parts", fill=self._apply_appearance_mode(self._fg_color),
outline=self._apply_appearance_mode(self._fg_color))
if self._progress_color == "transparent":
self._canvas.itemconfig("progress_parts", fill=self._apply_appearance_mode(self._fg_color),
outline=self._apply_appearance_mode(self._fg_color))
else:
self._canvas.itemconfig("progress_parts", fill=self._apply_appearance_mode(self._progress_color),
outline=self._apply_appearance_mode(self._progress_color))
if self._hover_state is True:
self._canvas.itemconfig("slider_parts",
fill=self._apply_appearance_mode(self._button_hover_color),
outline=self._apply_appearance_mode(self._button_hover_color))
else:
self._canvas.itemconfig("slider_parts",
fill=self._apply_appearance_mode(self._button_color),
outline=self._apply_appearance_mode(self._button_color))
def configure(self, require_redraw=False, **kwargs):
if "state" in kwargs:
self._state = kwargs.pop("state")
self._set_cursor()
require_redraw = True
if "fg_color" in kwargs:
self._fg_color = self._check_color_type(kwargs.pop("fg_color"))
require_redraw = True
if "progress_color" in kwargs:
self._progress_color = self._check_color_type(kwargs.pop("progress_color"), transparency=True)
require_redraw = True
if "button_color" in kwargs:
self._button_color = self._check_color_type(kwargs.pop("button_color"))
require_redraw = True
if "button_hover_color" in kwargs:
self._button_hover_color = self._check_color_type(kwargs.pop("button_hover_color"))
require_redraw = True
if "border_color" in kwargs:
self._border_color = self._check_color_type(kwargs.pop("border_color"), transparency=True)
require_redraw = True
if "border_width" in kwargs:
self._border_width = kwargs.pop("border_width")
require_redraw = True
if "from_" in kwargs:
self._from_ = kwargs.pop("from_")
if "to" in kwargs:
self._to = kwargs.pop("to")
if "number_of_steps" in kwargs:
self._number_of_steps = kwargs.pop("number_of_steps")
if "hover" in kwargs:
self._hover = kwargs.pop("hover")
if "command" in kwargs:
self._command = kwargs.pop("command")
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
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 == "hover":
return self._hover
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 = self._reverse_widget_scaling(event.x / self._current_width)
else:
self._value = 1 - self._reverse_widget_scaling(event.y / self._current_height)
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._hover is True and self._state == "normal":
self._hover_state = True
self._canvas.itemconfig("slider_parts",
fill=self._apply_appearance_mode(self._button_hover_color),
outline=self._apply_appearance_mode(self._button_hover_color))
def _on_leave(self, event=0):
self._hover_state = False
self._canvas.itemconfig("slider_parts",
fill=self._apply_appearance_mode(self._button_color),
outline=self._apply_appearance_mode(self._button_color))
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: str = None, command: Callable = None, add: Union[str, bool] = True):
""" called on the tkinter.Canvas """
if not (add == "+" or add is True):
raise ValueError("'add' argument can only be '+' or True to preserve internal callbacks")
self._canvas.bind(sequence, command, add=True)
def unbind(self, sequence: str = None, funcid: str = None):
""" called on the tkinter.Label and tkinter.Canvas """
if funcid is not None:
raise ValueError("'funcid' argument can only be None, because there is a bug in" +
" tkinter and its not clear whether the internal callbacks will be unbinded or not")
self._canvas.unbind(sequence, None)
self._create_bindings(sequence=sequence) # restore internal callbacks for sequence
def focus(self):
return self._canvas.focus()
def focus_set(self):
return self._canvas.focus_set()
def focus_force(self):
return self._canvas.focus_force()