pyqt5核心-信号与槽（第二弹）

果：

 from PyQt5 import QtCore, QtGui, QtWidgets

 class Ui_Form(object):
     def setupUi(self, Form):
         Form.setObjectName("Form")
         Form.resize(715, 225)
         self.controlsGroup = QtWidgets.QGroupBox(Form)
         self.controlsGroup.setGeometry(QtCore.QRect(10, 20, 451, 151))
         self.controlsGroup.setObjectName("controlsGroup")
         self.widget = QtWidgets.QWidget(self.controlsGroup)
         self.widget.setGeometry(QtCore.QRect(10, 40, 411, 30))
         self.widget.setObjectName("widget")
         self.horizontalLayout = QtWidgets.QHBoxLayout(self.widget)
         self.horizontalLayout.setContentsMargins(0, 0, 0, 0)
         self.horizontalLayout.setObjectName("horizontalLayout")
         self.label = QtWidgets.QLabel(self.widget)
         self.label.setObjectName("label")
         self.horizontalLayout.addWidget(self.label)
         self.numberSpinBox = QtWidgets.QSpinBox(self.widget)
         self.numberSpinBox.setObjectName("numberSpinBox")
         self.horizontalLayout.addWidget(self.numberSpinBox)
         self.styleCombo = QtWidgets.QComboBox(self.widget)
         self.styleCombo.setObjectName("styleCombo")
         self.styleCombo.addItem("")
         self.styleCombo.addItem("")
         self.styleCombo.addItem("")
         self.horizontalLayout.addWidget(self.styleCombo)
         self.label_2 = QtWidgets.QLabel(self.widget)
         self.label_2.setObjectName("label_2")
         self.horizontalLayout.addWidget(self.label_2)
         self.printButton = QtWidgets.QPushButton(self.widget)
         self.printButton.setObjectName("printButton")
         self.horizontalLayout.addWidget(self.printButton)
         self.widget1 = QtWidgets.QWidget(self.controlsGroup)
         self.widget1.setGeometry(QtCore.QRect(10, 100, 201, 30))
         self.widget1.setObjectName("widget1")
         self.horizontalLayout_2 = QtWidgets.QHBoxLayout(self.widget1)
         self.horizontalLayout_2.setContentsMargins(0, 0, 0, 0)
         self.horizontalLayout_2.setObjectName("horizontalLayout_2")
         self.previewStatus = QtWidgets.QCheckBox(self.widget1)
         self.previewStatus.setObjectName("previewStatus")
         self.horizontalLayout_2.addWidget(self.previewStatus)
         self.previewButton = QtWidgets.QPushButton(self.widget1)
         self.previewButton.setObjectName("previewButton")
         self.horizontalLayout_2.addWidget(self.previewButton)
         self.resultGroup = QtWidgets.QGroupBox(Form)
         self.resultGroup.setGeometry(QtCore.QRect(470, 20, 231, 151))
         self.resultGroup.setObjectName("resultGroup")
         self.resultLabel = QtWidgets.QLabel(self.resultGroup)
         self.resultLabel.setGeometry(QtCore.QRect(20, 30, 191, 101))
         self.resultLabel.setObjectName("resultLabel")

         self.retranslateUi(Form)
         QtCore.QMetaObject.connectSlotsByName(Form)

     def retranslateUi(self, Form):
         _translate = QtCore.QCoreApplication.translate
         Form.setWindowTitle(_translate("Form", "打印控件"))
         self.controlsGroup.setTitle(_translate("Form", "打印控制"))
         self.label.setText(_translate("Form", "打印份数:"))
         self.styleCombo.setItemText(0, _translate("Form", "A3"))
         self.styleCombo.setItemText(1, _translate("Form", "A4"))
         self.styleCombo.setItemText(2, _translate("Form", "A5"))
         self.label_2.setText(_translate("Form", "纸张类型:"))
         self.printButton.setText(_translate("Form", "打印"))
         self.previewStatus.setText(_translate("Form", "全屏预览"))
         self.previewButton.setText(_translate("Form", "预览"))
         self.resultGroup.setTitle(_translate("Form", "操作结果"))
         self.resultLabel.setText(_translate("Form", "<html><head/><body><p><br/></p></body></html>"))

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

 import sys
 from PyQt5.QtWidgets import QApplication , QMainWindow
 from MainWinSignalSlog02 import Ui_Form
 from PyQt5.QtCore import pyqtSignal , Qt 

 class MyMainWindow(QMainWindow, Ui_Form):
     helpSignal = pyqtSignal(str)
     printSignal = pyqtSignal(list)
     # 声明一个多重载版本的信号，包括了一个带int和str类型参数的信号，以及带str参数的信号
     previewSignal = pyqtSignal([int,str],[str])

     def __init__(self, parent=None):
         super(MyMainWindow, self).__init__(parent)
         self.setupUi(self)
         self.initUI()

     def initUI(self):
         self.helpSignal.connect(self.showHelpMessage)
         self.printSignal.connect(self.printPaper)
         self.previewSignal[str].connect(self.previewPaper)
         self.previewSignal[int,str].connect(self.previewPaperWithArgs)  

         self.printButton.clicked.connect(self.emitPrintSignal)
         self.previewButton.clicked.connect(self.emitPreviewSignal)

     # 发射预览信号
     def emitPreviewSignal(self):
         if self.previewStatus.isChecked() == True:
             self.previewSignal[int,str].emit(1080," Full Screen")
         elif self.previewStatus.isChecked() == False:
             self.previewSignal[str].emit("Preview")

     # 发射打印信号
     def emitPrintSignal(self):
         pList = []
         pList.append(self.numberSpinBox.value() )
         pList.append(self.styleCombo.currentText())
         self.printSignal.emit(pList)

     def printPaper(self,list):
         self.resultLabel.setText("打印: "+"份数："+ str(list[0]) +" 纸张："+str(list[1]))

     def previewPaperWithArgs(self,style,text):
         self.resultLabel.setText(str(style)+text)        

     def previewPaper(self,text):
         self.resultLabel.setText(text)  

     # 重载点击键盘事件
     def keyPressEvent(self, event):
         if event.key() == Qt.Key_F1:
             self.helpSignal.emit("help message")

     # 显示帮助消息
     def showHelpMessage(self,message):
         self.resultLabel.setText(message)
         self.statusBar().showMessage(message)

 if __name__=="__main__":
     app = QApplication(sys.argv)
     win = MyMainWindow()
     win.show()
     sys.exit(app.exec_())