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@dridk

dridk/RangeSlider.py

Last active Jun 30, 2020
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The following code creates a range slider as a Qt widget with a native looks and feel
from PySide2.QtWidgets import *
from PySide2.QtCore import *
from PySide2.QtGui import *
import sys
class RangeSlider(QWidget):
def __init__(self, parent=None):
super().__init__(parent)
self.first_position = 1
self.second_position = 8
self.opt = QStyleOptionSlider()
self.opt.minimum = 0
self.opt.maximum = 10
self.setTickPosition(QSlider.TicksAbove)
self.setTickInterval(1)
self.setSizePolicy(
QSizePolicy(QSizePolicy.Expanding, QSizePolicy.Fixed, QSizePolicy.Slider)
)
def setRangeLimit(self, minimum: int, maximum: int):
self.opt.minimum = minimum
self.opt.maximum = maximum
def setRange(self, start: int, end: int):
self.first_position = start
self.second_position = end
def getRange(self):
return (self.first_position, self.second_position)
def setTickPosition(self, position: QSlider.TickPosition):
self.opt.tickPosition = position
def setTickInterval(self, ti: int):
self.opt.tickInterval = ti
def paintEvent(self, event: QPaintEvent):
painter = QPainter(self)
# Draw rule
self.opt.initFrom(self)
self.opt.rect = self.rect()
self.opt.sliderPosition = 0
self.opt.subControls = QStyle.SC_SliderGroove | QStyle.SC_SliderTickmarks
#   Draw GROOVE
self.style().drawComplexControl(QStyle.CC_Slider, self.opt, painter)
#  Draw INTERVAL
color = self.palette().color(QPalette.Highlight)
color.setAlpha(160)
painter.setBrush(QBrush(color))
painter.setPen(Qt.NoPen)
self.opt.sliderPosition = self.first_position
x_left_handle = (
self.style()
.subControlRect(QStyle.CC_Slider, self.opt, QStyle.SC_SliderHandle)
.right()
)
self.opt.sliderPosition = self.second_position
x_right_handle = (
self.style()
.subControlRect(QStyle.CC_Slider, self.opt, QStyle.SC_SliderHandle)
.left()
)
groove_rect = self.style().subControlRect(
QStyle.CC_Slider, self.opt, QStyle.SC_SliderGroove
)
selection = QRect(
x_left_handle,
groove_rect.y(),
x_right_handle - x_left_handle,
groove_rect.height(),
).adjusted(-1, 1, 1, -1)
painter.drawRect(selection)
# Draw first handle
self.opt.subControls = QStyle.SC_SliderHandle
self.opt.sliderPosition = self.first_position
self.style().drawComplexControl(QStyle.CC_Slider, self.opt, painter)
# Draw second handle
self.opt.sliderPosition = self.second_position
self.style().drawComplexControl(QStyle.CC_Slider, self.opt, painter)
def mousePressEvent(self, event: QMouseEvent):
self.opt.sliderPosition = self.first_position
self._first_sc = self.style().hitTestComplexControl(
QStyle.CC_Slider, self.opt, event.pos(), self
)
self.opt.sliderPosition = self.second_position
self._second_sc = self.style().hitTestComplexControl(
QStyle.CC_Slider, self.opt, event.pos(), self
)
def mouseMoveEvent(self, event: QMouseEvent):
distance = self.opt.maximum - self.opt.minimum
pos = self.style().sliderValueFromPosition(
0, distance, event.pos().x(), self.rect().width()
)
if self._first_sc == QStyle.SC_SliderHandle:
if pos <= self.second_position:
self.first_position = pos
self.update()
return
if self._second_sc == QStyle.SC_SliderHandle:
if pos >= self.first_position:
self.second_position = pos
self.update()
def sizeHint(self):
""" override """
SliderLength = 84
TickSpace = 5
w = SliderLength
h = self.style().pixelMetric(QStyle.PM_SliderThickness, self.opt, self)
if (
self.opt.tickPosition & QSlider.TicksAbove
or self.opt.tickPosition & QSlider.TicksBelow
):
h += TickSpace
return (
self.style()
.sizeFromContents(QStyle.CT_Slider, self.opt, QSize(w, h), self)
.expandedTo(QApplication.globalStrut())
)
if __name__ == "__main__":
app = QApplication(sys.argv)
w = RangeSlider()
w.show()
# q = QSlider()
# q.show()
app.exec_()
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