pyqt5 之 信號+槽 測試用例

    在使用pycharm進行編寫代碼的時候，發現信號設置了connect一個槽，可是測試發現沒有起做用，另外，在pycharm編輯器上connect提示沒有這個函數，老是找不到緣由，後面決定仍是對碰到相應的知識點須要作對應的測試用例進行學習和驗證。

    下面這個是對信號+槽的一個典型實例。能夠正常按預期運行，在pycharm中connect也顯示沒有這個函數，應該就是pycharm自己設置和提示的問題，後面忽略它。因此有時候也不能鑽牛角尖，pycharm也僅僅是個編輯器而已。

#-*- coding:utf-8 -*-
'''
Signal & Slot
'''
__author__ = 'Tony Zhu'

import sys
from PyQt5.QtCore import Qt
from PyQt5.QtWidgets import (QWidget, QLCDNumber, QSlider,QGridLayout,QLabel,QHBoxLayout, QGroupBox,
    QVBoxLayout, QApplication,QProgressBar,QPushButton,QMessageBox)


class SignalSlot(QWidget):

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


    def initUI(self):

        self.controlsGroup = QGroupBox("運行樣本")
        self.lcdNumber = QLCDNumber(self)
        self.slider = QSlider(Qt.Horizontal, self)
        self.pBar = QProgressBar(self)
        vbox = QVBoxLayout()
        vbox.addWidget(self.pBar)
        vbox.addWidget(self.lcdNumber)
        vbox.addWidget(self.slider)
        self.controlsGroup.setLayout(vbox)

        controlsLayout = QGridLayout()
        self.label1 = QLabel("保存狀態：")
        self.saveLabel = QLabel()
        self.label2 = QLabel("運行狀態：")
        self.runLabel = QLabel()
        self.buttonSave = QPushButton("保存")
        self.buttonRun = QPushButton("運行")
        self.buttonStop = QPushButton("中止")
        self.buttonDisconnect = QPushButton("解除關聯")
        self.buttonConnect = QPushButton("綁定關聯")

        controlsLayout.addWidget(self.label1,0,0)
        controlsLayout.addWidget(self.saveLabel,0,1)
        controlsLayout.addWidget(self.label2,1,0)
        controlsLayout.addWidget(self.runLabel,1,1)
        controlsLayout.addWidget(self.buttonSave,2,0)
        controlsLayout.addWidget(self.buttonRun,2,1)
        controlsLayout.addWidget(self.buttonStop,2,2)
        controlsLayout.addWidget(self.buttonDisconnect,3,0)
        controlsLayout.addWidget(self.buttonConnect,3,1)

        layout = QHBoxLayout()
        layout.addWidget(self.controlsGroup)
        layout.addLayout(controlsLayout)
        self.setLayout(layout)

        self.buttonRun.clicked.connect(self.buttonSave.clicked)
        self.slider.valueChanged.connect(self.pBar.setValue)
        self.slider.valueChanged.connect(self.lcdNumber.display)
        self.buttonSave.clicked.connect(self.showMessage)
        self.buttonRun.clicked.connect(self.showMessage)
        self.buttonDisconnect.clicked.connect(self.unbindConnection)
        self.buttonConnect.clicked.connect(self.bindConnection)
        self.buttonStop.clicked.connect(self.stop)

        self.setGeometry(300, 500, 500, 180)
        self.setWindowTitle('信號和槽')

    def showMessage(self):
        if self.sender().text() == "保存":
            self.saveLabel.setText("Saved")
        elif self.sender().text() == "運行":
            self.saveLabel.setText("Saved")
            self.runLabel.setText("Running")

    def unbindConnection(self):
        self.slider.valueChanged.disconnect()
    def bindConnection(self):
        self.slider.valueChanged.connect(self.pBar.setValue)
        self.slider.valueChanged.connect(self.lcdNumber.display)
    def stop(self):
        self.saveLabel.setText("")
        self.runLabel.setText("")

if __name__ == '__main__':

    app = QApplication(sys.argv)
    ex = SignalSlot()
    ex.show()
    sys.exit(app.exec_())