#coding=gbk

from PyQt4 import QtGui,QtCore

import random

class MyWidget(QtGui.QWidget):

def __init__(self,parent=None):

if parent is None:

self.app=QtGui.QApplication([])

super(MyWidget,self).__init__(parent)

self.setToolTip('双击控件改变线条颜色'.decode('gbk'))

if parent is None:

self.show()

self.app.exec_()

def paintEvent(self,event):

colors=[QtCore.Qt.blue,QtCore.Qt.black,QtCore.Qt.red,

QtCore.Qt.green,QtCore.Qt.darkRed,QtCore.Qt.yellow]

p=QtGui.QPainter(self)

p.setPen(QtGui.QColor(colors[random.randint(0,5)]))

p.drawLine(0,0,self.width(),self.height())

p.save()

def mouseDoubleClickEvent(self,event):

self.repaint()

class TestMyWidget(QtGui.QWidget):

def __init__(self,parent=None):

self.app=QtGui.QApplication([])

super(TestMyWidget,self).__init__(parent)

self.setGeometry(200,300,200,300)

self.setWindowTitle('自制控件试验'.decode('gbk'))

layv=QtGui.QVBoxLayout()

self.setLayout(layv)

gp=QtGui.QGroupBox()

layv.addWidget(gp)

laygp=QtGui.QGridLayout()

gp.setLayout(laygp)

mw=MyWidget(gp)

laygp.addWidget(mw)

btn=QtGui.QPushButton('Ok')

btn.clicked.connect(self.close)

layv.addWidget(btn)

self.show()

self.app.exec_()

if __name__=='__main__':

TestMyWidget()