The slider QSlider control provides a vertical or horizontal slider. The slider is a typical control used to control bounded values. It allows users to move the slider in a certain range along the horizontal or vertical direction, and convert the position of the slider to an integer value within a legal range. Sometimes this method is more natural than entering numbers.

The common event types of QSlider control are as follows.

The slider control QSlider can be displayed horizontally or vertically. Just set different values in the constructor. Qt.Horizontal represents horizontal and Qt.Vertical represents vertical. The common methods of QSlider control are shown in the following table.

QSlider_ The optional enumeration values of tickposition are shown in the following table.

Program list: slider.py

import sys
from PyQt5.QtWidgets import QApplication, QWidget, QDesktopWidget, QLabel,
  QSlider, QSpinBox, QVBoxLayout
from PyQt5.QtCore import Qt


# Inherit QWidget
class SliderWidget(QWidget):
    info_lbl = None

    def __init__(self):
        super().__init__()
        self.init_ui()

    def init_ui(self):
        # Vertical layout
        v_box = QVBoxLayout()
        self.info_lbl = QLabel("The current value of the slider control is:10")
        v_box.addWidget(self.info_lbl)
        # Create a horizontal slider
        slider = QSlider(Qt.Horizontal)
        slider.setProperty("id", 1)
        slider.setMinimum(10)  # Set minimum value
        slider.setMaximum(100)  # Set maximum
        slider.setSingleStep(10)  # step
        slider.setValue(20)  # set currency
        slider.setTickInterval(10)  # Set scale spacing
        slider.valueChanged.connect(self.valuechange)
        v_box.addWidget(slider)
        self.setLayout(v_box)
        # resize window
        self.resize(600, 200)
        # Center window
        self.center()
        # Window title
        self.setWindowTitle("Application of slider")
        # Display window
        self.show()

    def valuechange(self):
        sender = self.sender()
        self.info_lbl.setText("The current value of the slider control is:%d" % sender.value())

    # Achieve centering
    def center(self):
        f = self.frameGeometry()
        c = QDesktopWidget().availableGeometry().center()
        f.moveCenter(c)
        self.move(f.topLeft())


if __name__ == "__main__":
    app = QApplication(sys.argv)
    w = SliderWidget()
    sys.exit(app.exec_())

After running the program, the pop-up window is as follows:

Well, that's all for the slider control. Pay attention to me and the next section will be more exciting.

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