from tkinter import Scale, HORIZONTAL, VERTICAL
from . import utilities as utils
from .base import TextWidget
class Slider(TextWidget):
def __init__(
self,
master,
start=0,
end=100,
horizontal=True,
command=None,
grid=None,
align=None,
visible=True,
enabled=None,
width=None,
height=None):
description = "[Slider] object from " + str(start) + " to " + str(end)
# Set the direction
self._horizontal = horizontal
orient = HORIZONTAL if horizontal else VERTICAL
# Create a tk Scale object within this object
tk = Scale(master.tk, from_=start, to=end, orient=orient, command=self._command_callback)
super(Slider, self).__init__(master, tk, description, grid, align, visible, enabled, width, height)
self.update_command(command)
# PROPERTIES
# ----------------
# Get/set the value
@property
def value(self):
return (self.tk.get())
@value.setter
def value(self, value):
self.tk.set(value)
def resize(self, width, height):
self._set_width(width)
self._set_height(height)
if width == "fill" or height == "fill":
self.master.display_widgets()
def _set_width(self, width):
self._width = width
if width != "fill":
if self._horizontal:
self._set_tk_config("length", width)
else:
self._set_tk_config("width", width)
def _set_height(self, height):
self._height = height
if height != "fill":
if self._horizontal:
self._set_tk_config("width", height)
else:
self._set_tk_config("length", height)
# METHODS
# ----------------
# Calls the given function when the slider value is changed
def _command_callback(self, value):
if self._command:
args_expected = utils.no_args_expected(self._command)
if args_expected == 0:
self._command()
elif args_expected == 1:
self._command(value)
else:
utils.error_format("Slider command function must accept either 0 or 1 arguments.\nThe current command has {} arguments.".format(args_expected))
def update_command(self, command):
if command is None:
self._command = lambda: None
else:
self._command = command
