Skip to content

Instantly share code, notes, and snippets.

@dennis-tra
Created January 20, 2017 10:46
Show Gist options
  • Save dennis-tra/994a65d6165a328d4eabaadbaedac2cc to your computer and use it in GitHub Desktop.
Save dennis-tra/994a65d6165a328d4eabaadbaedac2cc to your computer and use it in GitHub Desktop.
PyQt - QSlider for float or double values + tests
from PyQt5.QtWidgets import QSlider
class DoubleSlider(QSlider):
def __init__(self, *args, **kwargs):
super().__init__(*args, **kwargs)
self.decimals = 5
self._max_int = 10 ** self.decimals
super().setMinimum(0)
super().setMaximum(self._max_int)
self._min_value = 0.0
self._max_value = 1.0
@property
def _value_range(self):
return self._max_value - self._min_value
def value(self):
return float(super().value()) / self._max_int * self._value_range + self._min_value
def setValue(self, value):
super().setValue(int((value - self._min_value) / self._value_range * self._max_int))
def setMinimum(self, value):
if value > self._max_value:
raise ValueError("Minimum limit cannot be higher than maximum")
self._min_value = value
self.setValue(self.value())
def setMaximum(self, value):
if value < self._min_value:
raise ValueError("Minimum limit cannot be higher than maximum")
self._max_value = value
self.setValue(self.value())
def minimum(self):
return self._min_value
def maximum(self):
return self._max_value
from unittest import TestCase
from PyQt5.QtWidgets import QSlider
from DoubleSlider import DoubleSlider
class TestDoubleSlider(TestCase):
def setUp(self):
self.slider = DoubleSlider()
def test_if_double_slider_is_subclass_of_QSlider(self):
self.assertIsInstance(self.slider, QSlider)
def test_set_float_value(self):
self.slider.setValue(0.0)
self.assertAlmostEqual(self.slider.value(), 0.0, delta=0.01)
self.slider.setValue(0.6)
self.assertAlmostEqual(self.slider.value(), 0.6, delta=0.01)
def test_default_min_max_values(self):
self.assertAlmostEqual(self.slider.minimum(), 0.0, delta=0.001)
self.assertAlmostEqual(self.slider.maximum(), 1.0, delta=0.001)
def test_setting_minimum_value_above_maximum_value(self):
with self.assertRaises(ValueError):
self.slider.setMinimum(2.0)
def test_setting_maximum_value_below_minimum_value(self):
with self.assertRaises(ValueError):
self.slider.setMaximum(-0.5)
def test_valid_limits(self):
self.slider.setMinimum(0.6)
self.slider.setMaximum(2.3)
self.assertAlmostEqual(self.slider.minimum(), 0.6, delta=0.001)
self.assertAlmostEqual(self.slider.maximum(), 2.3, delta=0.001)
self.slider.setMinimum(-5.0)
self.slider.setMaximum(-2.0)
self.assertAlmostEqual(self.slider.minimum(), -5.0, delta=0.001)
self.assertAlmostEqual(self.slider.maximum(), -2.0, delta=0.001)
def test_setting_value_below_lower_limit(self):
self.slider.setMinimum(0.6)
self.slider.setValue(0.2)
self.assertAlmostEqual(self.slider.value(), 0.6, delta=0.001)
def test_setting_value_above_upper_limit(self):
self.slider.setMaximum(0.6)
self.slider.setValue(0.9)
self.assertAlmostEqual(self.slider.value(), 0.6, delta=0.001)
def test_usual_numbers(self):
self.slider.setMinimum(0.8)
self.slider.setMaximum(2.3)
self.slider.setValue(1.46)
self.assertAlmostEqual(self.slider.value(), 1.46, delta=0.01)
def test_negative_range(self):
self.slider.setMinimum(-5.0)
self.slider.setMaximum(-1.0)
self.slider.setValue(-4.4)
self.assertAlmostEqual(self.slider.value(), -4.4, delta=0.01)
@splinecraft
Copy link

Thanks, this was super helpful!

Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment