Python Qt GUI设计：QScrollBar类实现窗口水平或垂直滑动条效果（拓展篇—4）

import sys
from PyQt5.QtCore import *
from PyQt5.QtGui import *
from PyQt5.QtWidgets import *

class Example(QWidget):
	def __init__(self):
		super(Example, self).__init__()
		self.initUI()
		
	def initUI(self): 
		hbox = QHBoxLayout( )
		self.l1 = QLabel("拖动滑动条去改变颜色")
		self.l1.setFont(QFont("Arial",16))
		hbox.addWidget(self.l1)
		self.s1 = QScrollBar()
		self.s1.setMaximum(255)
		self.s1.sliderMoved.connect(self.sliderval)
		self.s2 = QScrollBar()
		self.s2.setMaximum(255)
		self.s2.sliderMoved.connect(self.sliderval)
		self.s3 = QScrollBar()
		self.s3.setMaximum(255)
		self.s3.sliderMoved.connect(self.sliderval)
		hbox.addWidget(self.s1)
		hbox.addWidget(self.s2)
		hbox.addWidget(self.s3)
		self.setGeometry(300, 300, 300, 200)
		self.setWindowTitle('QScrollBar 例子')
		self.setLayout( hbox )
		
	def sliderval(self):
		print( self.s1.value(),self.s2.value(), self.s3.value() )
		palette = QPalette()
		c = QColor(self.s1.value(),self.s2.value(), self.s3.value(),255)
		palette.setColor(QPalette.Foreground,c)
		self.l1.setPalette(palette)

if __name__ == '__main__':
	app = QApplication(sys.argv)
	demo = Example() 	
	demo.show()
	sys.exit(app.exec_())