QSpinBox¶
The QSpinBox class provides a spinbox widget that lets you select and control integers.
For further details, check QSpinBox official document .
Example¶
import sys
from PyQt5.QtWidgets import QApplication, QWidget, QLabel, QSpinBox, QVBoxLayout
class MyApp(QWidget):
def __init__(self):
super().__init__()
self.initUI()
def initUI(self):
self.lbl1 = QLabel('QSpinBox')
self.spinbox = QSpinBox()
self.spinbox.setMinimum(-10)
self.spinbox.setMaximum(30)
# self.spinbox.setRange(-10, 30)
self.spinbox.setSingleStep(2)
self.lbl2 = QLabel('0')
self.spinbox.valueChanged.connect(self.value_changed)
vbox = QVBoxLayout()
vbox.addWidget(self.lbl1)
vbox.addWidget(self.spinbox)
vbox.addWidget(self.lbl2)
vbox.addStretch()
self.setLayout(vbox)
self.setWindowTitle('QSpinBox')
self.setGeometry(300, 300, 300, 200)
self.show()
def value_changed(self):
self.lbl2.setText(str(self.spinbox.value()))
if __name__ == '__main__':
app = QApplication(sys.argv)
ex = MyApp()
sys.exit(app.exec_())
Two labels(self.lbl1, self.lbl2) and a spinbox widget(self.spinbox) appears on the window.
Description¶
self.spinbox = QSpinBox()
self.spinbox.setMinimum(-10)
self.spinbox.setMaximum(30)
Make a QSpinBox object(self.spinbox).
You can use setMinimum() and setMaximum() methods to limit the selection range. By default, the minimum is 0 and the maximum is 99.
# self.spinbox.setRange(-10, 30)
setRange() method is the same as setMinimum() and setMaximum() combined.
self.spinbox.setSingleStep(2)
Use setSingleStep() to set one step as 2.
For spin box, the minimum value that can be set as a single step is 1.
self.spinbox.valueChanged.connect(self.value_changed)
Connect the signal that occurs when the value of the spinbox widget is changed (valueChanged) to the self.value_changed method.
vbox = QVBoxLayout()
vbox.addWidget(self.lbl1)
vbox.addWidget(self.spinbox)
vbox.addWidget(self.lbl2)
vbox.addStretch()
self.setLayout(vbox)
Use the vertical box layout to place two labels and spin-box widget vertically, and set it as the layout of the entire widget.
def value_changed(self):
self.lbl2.setText(str(self.spinbox.value()))
When the value of the spin box changes, set the text of self.lbl2 as the value of spinbox (self.spinbox.value()).
