''' 【简介】 PyQt5中 QSlider 例子
'''
import sys from PyQt5.QtCore import * from PyQt5.QtGui import * from PyQt5.QtWidgets import *
class SliderDemo(QWidget): def init(self, parent=None): super(SliderDemo, self).init(parent) self.setWindowTitle("QSlider 例子") self.resize(300, 100)
layout = QVBoxLayout()
self.l1 = QLabel("Hello PyQt5")
self.l1.setAlignment(Qt.AlignCenter)
layout.addWidget(self.l1)
# 水平方向
self.sl = QSlider(Qt.Horizontal)
# 设置最小值
self.sl.setMinimum(10)
# 设置最大值
self.sl.setMaximum(50)
# 步长
self.sl.setSingleStep(3)
# 设置当前值
self.sl.setValue(20)
# 刻度位置,刻度在下方
self.sl.setTickPosition(QSlider.TicksBelow)
# 设置刻度间隔
self.sl.setTickInterval(5)
layout.addWidget(self.sl)
# 连接信号槽
self.sl.valueChanged.connect(self.valuechange)
self.setLayout(layout)
def valuechange(self):
print('current slider value=%s' % self.sl.value())
size = self.sl.value()
self.l1.setFont(QFont("Arial", size))
if name == 'main': app = QApplication(sys.argv) demo = SliderDemo() demo.show() sys.exit(app.exec_())