Spin Box

  • This example demonstrates how to use the QSpinBox widget:

Listing 7 scripts/PYQT2/02_sub_widget/02_spin_box/main.py
 1# -*- coding: utf-8 -*-
 2
 3import sys
 4from PyQt5.QtWidgets import QApplication, QMainWindow, QSpinBox, QVBoxLayout, QWidget, QLabel
 5
 6class SpinBoxExample(QMainWindow):
 7    def __init__(self):
 8        super(SpinBoxExample, self).__init__()
 9
10        self.init_ui()
11
12    def init_ui(self):
13        layout = QVBoxLayout()
14
15        self.label = QLabel("Selected Value:", self)
16
17        self.spin_box = QSpinBox(self)
18        self.spin_box.setRange(0, 100)  # 0부터 100까지의 범위 설정
19        self.spin_box.setSingleStep(5)  # 5단위로 값 변경
20        self.spin_box.setPrefix("$")    # 접두사로 달러 표시
21        self.spin_box.valueChanged.connect(self.update_label)  # 값 변경 시 라벨 업데이트
22
23        layout.addWidget(self.label)
24        layout.addWidget(self.spin_box)
25
26        container = QWidget()
27        container.setLayout(layout)
28        self.setCentralWidget(container)
29
30    def update_label(self, value):
31        self.label.setText("Selected Value: ${}".format(value))
32
33if __name__ == '__main__':
34    app = QApplication(sys.argv)
35    window = SpinBoxExample()
36    window.show()
37    sys.exit(app.exec_())

  • QSpinBox: A widget that allows the user to input an integer value. Users can click the arrows within the widget or directly input numbers to change the value.

  • In this example, the QSpinBox ranges from 0 to 100, adjusting in increments of 5. It also prefixes the displayed value with the ‘$’ sign. When the user changes the value, the connected slot function update_label is invoked to update the text of the label widget.