#!/usr/bin/env python # # The MIT License (MIT) # # Copyright (c) <2022-Present> # # Permission is hereby granted, free of charge, to any person obtaining a copy # of this software and associated documentation files (the 'Software'), to deal # in the Software without restriction, including without limitation the rights # to use, copy, modify, merge, publish, distribute, sublicense, and/or sell # copies of the Software, and to permit persons to whom the Software is # furnished to do so, subject to the following conditions: # # The above copyright notice and this permission notice shall be included in # all copies or substantial portions of the Software. # # THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND, EXPRESS OR # IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, # FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE # AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN # THE SOFTWARE. ''' slider ====== Example showing how to add ticks to a QSlider. Note that this does not work with stylesheets, so it's merely an example of how to get customized styling behavior with a QSlider. ''' import argparse import os import sys example_dir = os.path.dirname(os.path.realpath(__file__)) home = os.path.dirname(example_dir) dist = os.path.join(home, 'dist') # Create our arguments. parser = argparse.ArgumentParser(description='Configurations for the Qt5 application.') parser.add_argument( '--stylesheet', help='''stylesheet name''', default='native' ) # Know working styles include: # 1. Fusion # 2. Windows parser.add_argument( '--style', help='''application style, which is different than the stylesheet''', default='native' ) parser.add_argument( '--font-size', help='''font size for the application''', type=float, default=-1 ) parser.add_argument( '--font-family', help='''the font family''' ) parser.add_argument( '--scale', help='''scale factor for the UI''', type=float, default=1, ) parser.add_argument( '--pyqt6', help='''use PyQt6 rather than PyQt5.''', action='store_true' ) parser.add_argument( '--use-x11', help='''force the use of x11 on compatible systems.''', action='store_true' ) args, unknown = parser.parse_known_args() if args.pyqt6: from PyQt6 import QtCore, QtGui, QtWidgets QtCore.QDir.addSearchPath(args.stylesheet, f'{dist}/pyqt6/{args.stylesheet}/') resource_format = f'{args.stylesheet}:' else: sys.path.insert(0, home) from PyQt5 import QtCore, QtGui, QtWidgets import breeze_resources resource_format = f':/{args.stylesheet}/' stylesheet = f'{resource_format}stylesheet.qss' # Compat definitions, between Qt5 and Qt6. if args.pyqt6: AlignHCenter = QtCore.Qt.AlignmentFlag.AlignHCenter ReadOnly = QtCore.QFile.OpenModeFlag.ReadOnly Text = QtCore.QFile.OpenModeFlag.Text Horizontal = QtCore.Qt.Orientation.Horizontal NoTicks = QtWidgets.QSlider.TickPosition.NoTicks TicksAbove = QtWidgets.QSlider.TickPosition.TicksAbove TicksBelow = QtWidgets.QSlider.TickPosition.TicksBelow TicksBothSides = QtWidgets.QSlider.TickPosition.TicksBothSides CC_Slider = QtWidgets.QStyle.ComplexControl.CC_Slider SC_SliderHandle = QtWidgets.QStyle.SubControl.SC_SliderHandle SC_SliderGroove = QtWidgets.QStyle.SubControl.SC_SliderGroove else: AlignHCenter = QtCore.Qt.AlignHCenter ReadOnly = QtCore.QFile.ReadOnly Text = QtCore.QFile.Text Horizontal = QtCore.Qt.Horizontal NoTicks = QtWidgets.QSlider.NoTicks TicksAbove = QtWidgets.QSlider.TicksAbove TicksBelow = QtWidgets.QSlider.TicksBelow TicksBothSides = QtWidgets.QSlider.TicksBothSides CC_Slider = QtWidgets.QStyle.CC_Slider SC_SliderHandle = QtWidgets.QStyle.SC_SliderHandle SC_SliderGroove = QtWidgets.QStyle.SC_SliderGroove class Slider(QtWidgets.QSlider): '''QSlider with a custom paint event.''' def __init__(self, *args, **kwds): super().__init__(*args, **kwds) def paintEvent(self, event): '''Override the paint event to ensure the ticks are painted.''' painter = QtWidgets.QStylePainter(self) options = QtWidgets.QStyleOptionSlider() self.initStyleOption(options) style = self.style() handle = style.subControlRect(CC_Slider, options, SC_SliderHandle, self) interval = self.tickInterval() or self.pageStep() position = self.tickPosition() if position != NoTicks and interval != 0: minimum = self.minimum() maximum = self.maximum() color = self.palette().color(self.foregroundRole()) painter.setPen(color) for i in range(minimum, maximum + interval, interval): percent = (i - minimum) / (maximum - minimum + 1) + 0.005 width = (self.width() - handle.width()) + handle.width() / 2 x = int(percent * width) h = 4 if position == TicksBothSides or position == TicksAbove: y = self.rect().top() painter.drawLine(x, y, x, y + h) if position == TicksBothSides or position == TicksBelow: y = self.rect().bottom() painter.drawLine(x, y, x, y - h) options.subControls = SC_SliderGroove painter.drawComplexControl(CC_Slider, options) options.subControls = SC_SliderHandle painter.drawComplexControl(CC_Slider, options) class Ui: '''Main class for the user interface.''' def setup(self, MainWindow): MainWindow.setObjectName('MainWindow') MainWindow.resize(1068, 824) self.centralwidget = QtWidgets.QWidget(MainWindow) self.centralwidget.setObjectName('centralwidget') self.layout = QtWidgets.QVBoxLayout(self.centralwidget) self.layout.setObjectName('layout') self.layout.setAlignment(AlignHCenter) MainWindow.setCentralWidget(self.centralwidget) self.slider = Slider(self.centralwidget) self.slider.setOrientation(Horizontal) self.slider.setTickInterval(5) self.slider.setTickPosition(TicksAbove) self.slider.setObjectName('slider') self.layout.addWidget(self.slider) def main(): 'Application entry point' if args.scale != 1: os.environ['QT_SCALE_FACTOR'] = str(args.scale) else: os.environ['QT_AUTO_SCREEN_SCALE_FACTOR'] = '1' app = QtWidgets.QApplication(sys.argv[:1] + unknown) if args.style != 'native': style = QtWidgets.QStyleFactory.create(args.style) app.setStyle(style) window = QtWidgets.QMainWindow() # setup ui ui = Ui() ui.setup(window) window.setWindowTitle('QSlider with Ticks.') # use the default font size font = app.font() if args.font_size > 0: font.setPointSizeF(args.font_size) if args.font_family: font.setFamily(args.font_family) app.setFont(font) # setup stylesheet if args.stylesheet != 'native': file = QtCore.QFile(stylesheet) file.open(ReadOnly | Text) stream = QtCore.QTextStream(file) app.setStyleSheet(stream.readAll()) # run window.show() if args.pyqt6: return app.exec() else: return app.exec_() if __name__ == '__main__': sys.exit(main())