PyQt5之QPushButton

鉴于之前学习过Qt的皮毛知识，在此利用学习Python的机会，温习一下之前所学。本例小试牛刀，根据网上所学(由于时间久远，记不起根据哪里学的了)，熟悉QPushButton的使用，顺便学习了在PyQt5中信号与槽的机制。

#-*- coding:utf-8 -*-

import sys
from PyQt5.QtWidgets import (QApplication,QWidget,QPushButton,QFrame)
from PyQt5.QtGui import QColor

class Example(QWidget):

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

def initUI(self):

self.col = QColor(0,0,0)

redb = QPushButton('Red',self)
redb.setCheckable(True)
redb.move(10,10)
redb.clicked[bool].connect(self.setColor)

redb = QPushButton('Green',self)
redb.setCheckable(True)
redb.move(10,60)
redb.clicked[bool].connect(self.setColor)

blueb = QPushButton('Blue',self)
blueb.setCheckable(True)
blueb.move(10,110)
blueb.clicked[bool].connect(self.setColor)

self.square = QFrame(self)
self.square.setGeometry(150,20,100,100)
self.square.setStyleSheet("QWidget { background-color: %s }" % self.col.name())

self.setGeometry(300,300,280,170)
self.setWindowTitle('Toggle button')
self.show()

def setColor(self,pressed):
source = self.sender()

if pressed:
val = 255
else:
val = 0

if source.text() == 'Red':
self.col.setRed(val)
elif source.text() == 'Green':
self.col.setGreen(val)
else:
self.col.setBlue(val)

self.square.setStyleSheet("QFrame { background-color: %s }" % self.col.name())

if __name__ == '__main__':

app = QApplication(sys.argv)

ex = Example()

sys.exit(app.exec_())