抽奖小程序

本例涉及到的新的内容有:QComboBox, QSpinBox, QCheckBox，打开文件对话框和标准消息对话框的使用，布局的嵌套，多线程的应用。

程序的效果如图：

代码如下：

# _*_ coding:utf-8_*_ import sys from random import choice from PyQt5.QtGui import * from PyQt5.QtWidgets import * from PyQt5.QtCore import Qt,QThread,pyqtSignal

class MyThread(QThread):#自定义额外的线程 my_signal = pyqtSignal(int)# 信号类型：int

def __init__(self,wait_seconds=1,parent=None): super().__init__(parent) self.wait_seconds = wait_seconds

def run(self): i=1 while True:#可以是死循环，靠外部条件终线程 self.sleep(self.wait_seconds)#等待 self.my_signal.emit(i)#发射 int 信号 print(u"本轮已抽中%d人"% i) i += 1

class MyWidget(QWidget):#创建一个QWidget的 子类 def __init__(self,parent = None):#初始化函数 super().__init__(parent)#调用基类的初始化函数 #默认的列表，仅供演示 self.List = [u"001 小兔", u"002 小脑虎",u"003 佩奇",u"004 米奇", u"005 饭桶博士", u"006 唐老鸭", u"007 米妮",u"008 黛丝",u"009 高飞", u"010 汤姆", u"011 Jerry", u"012 奥特曼",u"013 小怪兽",u"014 猪爸爸", u"015 小强"] self.initUI() self.load_btn.clicked.connect(self.loadList) self.combo_box.currentIndexChanged.connect(self.comboxchanged)

self.spinBox.value() self.thread = MyThread(1) self.button.clicked.connect(self.thread_start) self.thread.my_signal.connect(self.updateUI) def loadList(self): filename, filetype= QFileDialog.getOpenFileName(self, u'选择名单文件', './',"Text Files (*.txt);;All Files (*)") if filename: f = open(filename) self.List = [line.strip() for line in f.readlines()]

def initUI(self): self.load_btn = QPushButton(u"载入全部名单") self.load_btn.setFixedWidth(100) label1 = QLabel(u"中奖名单:") self.browser = QTextBrowser()#多行文本浏览框 self.label2 = QLabel() self.label2.setFixedHeight(60) self.label2.setFont(QFont("Roman times",18,QFont.Bold)) self.label2.setAlignment(Qt.AlignHCenter | Qt.AlignVCenter) self.label2.setText(u"中奖者") self.label2.setFrameShape(QFrame.Panel) #NoFrame,Box,Panel,StyledPanel,HLine,VLine self.label2.setFrameShadow(QFrame.Raised) #Plain,Raised,Sunken

lable3 = QLabel(u"选择奖品等级:") lable3.setAlignment(Qt.AlignRight | Qt.AlignVCenter) self.combo_box = QComboBox() self.combo_box.addItem(u"一等奖") self.combo_box.addItem(u"二等奖") self.combo_box.addItem(u"三等奖") self.combo_box.setCurrentIndex(self.combo_box.count()-1)

lable4 = QLabel(u"中奖人数设置:") lable4.setAlignment(Qt.AlignRight | Qt.AlignVCenter) self.spinBox = QSpinBox() self.spinBox.setMinimum(1) self.spinBox.setMaximum(len(self.List)) self.spinBox.setValue(5)#三等奖人数默认值 self.checkBox = QCheckBox(u"可重复中奖") self.checkBox.setChecked(True)

hlayout = QHBoxLayout()#创建水平箱型布局 hlayout.addWidget(lable3) hlayout.addWidget(self.combo_box) hlayout.addWidget(lable4) hlayout.addWidget(self.spinBox) hlayout.addStretch() hlayout.addWidget(self.checkBox) self.button = QPushButton(u"开始抽奖") self.button.setFixedHeight(30) #self.button.resize(self.button.sizeHint())

vlayout = QVBoxLayout()#创建垂向箱型布局 vlayout.addWidget(self.load_btn)# vlayout.addWidget(label1)# vlayout.addWidget(self.browser)#往垂向箱型布局添加控件 vlayout.addWidget(self.label2) vlayout.addLayout(hlayout) vlayout.addWidget(self.button)

self.setLayout(vlayout)#设置self 的布局 self.resize(400,250) self.setWindowTitle(u"抽奖小程序") def updateUI(self, i):#int 信号传进来 winner = choice(self.List) self.List.remove(winner) self.winners.append(winner) self.label2.setText(winner) self.browser.append("%s (%s)"%(winner,self.combo_box.currentText())) if i >= self.spinBox.value():#若人数已抽够 self.thread.terminate()#终止额外线程 self.browser.append('') if self.checkBox.isChecked():#可重复抽中 self.List.extend(self.winners) else: self.spinBox.setMaximum(len(self.List)) self.button.setEnabled(True) self.spinBox.setEnabled(True) self.combo_box.setEnabled(True) self.checkBox.setEnabled(True) print()

def comboxchanged(self, index): if index ==0:#一等奖 self.spinBox.setValue(1)#默认中奖人数 elif index ==1:#二等奖 self.spinBox.setValue(3)#默认中奖人数 elif index ==2:#三等奖 self.spinBox.setValue(5)#默认中奖人数 else:pass def thread_start(self): if not self.spinBox.value(): self.label2.clear() return self.sender().setEnabled(False) self.spinBox.setEnabled(False) self.combo_box.setEnabled(False) self.checkBox.setEnabled(False) self.winners = [ ]

self.thread.start()#开始线程

def closeEvent(self, event): #消息对话框 reply = QMessageBox.question(self, 'Message',"Are you sure to quit?", QMessageBox.Yes | QMessageBox.No, QMessageBox.No) if reply == QMessageBox.Yes:#退出前确认 self.thread.terminate()#终止额外的线程，否则主程序结束它还继续跑 event.accept() else: event.ignore() pass if __name__== '__main__': app = QApplication(sys.argv) widget = MyWidget() widget.show() #显示到屏幕 sys.exit(app.exec_())