PyQt5+eric6之旅(三) - 多线程应用 - 追加显示

实时追加显示

• code

  from PyQt5 import QtCore, QtGui, QtWidgets
  from PyQt5.QtCore import * 
  from PyQt5.QtWidgets import *
  import time
  import sys
  
  class EmittingStream(QtCore.QObject):  
          textWritten = QtCore.pyqtSignal(str)  #定义一个发送str的信号
          def write(self, data):
              self.textWritten.emit(str(data)) 
  
  class BackendThread(QThread):
       # 通过类成员对象定义信号
      update_date = pyqtSignal(str)
  
       # 处理业务逻辑
      def run(self):
          while True:
              data = QDateTime.currentDateTime()
              currTime = data.toString("yyyy-MM-dd hh:mm:ss")
              self.update_date.emit( str(currTime) )
              time.sleep(1)
  
  class Ui_MainWindow(object):
      def setupUi(self, MainWindow):
          MainWindow.setObjectName("MainWindow")
          MainWindow.resize(800, 600)
          self.centralWidget = QtWidgets.QWidget(MainWindow)
          self.centralWidget.setObjectName("centralWidget")
          self.gridLayout = QtWidgets.QGridLayout(self.centralWidget)
          self.gridLayout.setObjectName("gridLayout")
          self.pushButton = QtWidgets.QPushButton(self.centralWidget)
          self.pushButton.setObjectName("pushButton")
          self.gridLayout.addWidget(self.pushButton, 0, 0, 1, 1)
          self.textEdit = QtWidgets.QTextEdit(self.centralWidget)
          self.textEdit.setObjectName("textEdit")
          self.gridLayout.addWidget(self.textEdit, 1, 0, 1, 1)
          MainWindow.setCentralWidget(self.centralWidget)
          
          #下面将输出重定向到textEdit中
          sys.stdout = EmittingStream(textWritten=self.handleDisplay)  
          sys.stderr = EmittingStream(textWritten=self.handleDisplay)
          
          self.retranslateUi(MainWindow)
          QtCore.QMetaObject.connectSlotsByName(MainWindow)
          
      def retranslateUi(self, MainWindow):
          _translate = QtCore.QCoreApplication.translate
          MainWindow.setWindowTitle(_translate("MainWindow", "实时显示"))
          self.pushButton.setText(_translate("MainWindow", "开始"))
  
      def initUI(self):
            # 创建线程
          self.backend = BackendThread()
            # 连接信号
          self.backend.update_date.connect(self.handleDisplay)
            # 开始线程
          self.backend.start()
  
      # 将当前时间输出到文本框
      def handleDisplay(self, data):
          cursor = self.textEdit.textCursor()  
          cursor.movePosition(QtGui.QTextCursor.End)
          # self.textEdit.setText(data)
          cursor.insertText(data + '\n')  
          self.textEdit.setTextCursor(cursor)  
          self.textEdit.ensureCursorVisible()
  
  if __name__ == '__main__':
      
      app = QtWidgets.QApplication(sys.argv)
      MainWindow = QtWidgets.QMainWindow()
      win = Ui_MainWindow()
      win.setupUi(MainWindow)
      win.initUI()
      MainWindow.show()
      sys.exit(app.exec_())

• result

目前遇到的问题是qt designer使用上遇到很多坑,像是菜单,工具栏各个按钮之间怎么去绑定特定的槽,各种报错.

然后现在想到一种方式是,qt designer纯用来设计页面,信号与槽之间的绑定自己写,修修补补.

参考

• https://www.cnblogs.com/topsh...
• http://www.broadview.com.cn/a...