Python：如何从QTabWidget查询当前Tab

Question

带有三个标签的简单对话框：'Tab_01'，'Tab_02'和'Tab_03'。 按“什么标签？”按钮应该打印当前活动的选项卡。 怎么实现呢？ （示例代码见下文）：

from PyQt4 import QtGui, QtCore
import sys, os


class Dialog_01(QtGui.QMainWindow):
    def __init__(self):
        super(QtGui.QMainWindow,self).__init__()

        mainWidget=QtGui.QWidget()
        self.setCentralWidget(mainWidget)
        mainLayout = QtGui.QVBoxLayout()
        mainWidget.setLayout(mainLayout)

        self.tabWidget = QtGui.QTabWidget()
        mainLayout.addWidget(self.tabWidget)

        self.tabWidget.connect(self.tabWidget, QtCore.SIGNAL("currentChanged(int)"), self.tabSelected)

        myBoxLayout = QtGui.QVBoxLayout()
        self.tabWidget.setLayout(myBoxLayout)

        self.tabWidget.addTab(QtGui.QWidget(),'Tab_01')
        self.tabWidget.addTab(QtGui.QWidget(),'Tab_02')
        self.tabWidget.addTab(QtGui.QWidget(),'Tab_03')          


        ButtonBox = QtGui.QGroupBox() 
        ButtonsLayout = QtGui.QHBoxLayout()
        ButtonBox.setLayout(ButtonsLayout)

        Button_01 = QtGui.QPushButton("What Tab?")
        ButtonsLayout.addWidget(Button_01)
        Button_01.clicked.connect(self.whatTab)

        mainLayout.addWidget(ButtonBox)


    def tabSelected(self, arg=None):
        print '\n\t tabSelected():', arg

    def whatTab(self):
        print '\n\t current Tab:', '?'


if __name__ == '__main__':
    app = QtGui.QApplication(sys.argv)
    dialog_1 = Dialog_01()
    dialog_1.show()
    dialog_1.resize(480,320)
    sys.exit(app.exec_())

Answer 1

正如您所看到的那样here QTabWidget有方法currentIndex和currentWidget。

Answer 2

这是解决方案（感谢Hyperboreus！）：

from PyQt4 import QtGui, QtCore
import sys, os


class Dialog_01(QtGui.QMainWindow):
    def __init__(self):
        super(QtGui.QMainWindow,self).__init__()

        mainWidget=QtGui.QWidget()
        self.setCentralWidget(mainWidget)
        mainLayout = QtGui.QVBoxLayout()
        mainWidget.setLayout(mainLayout)

        self.tabWidget = QtGui.QTabWidget()
        mainLayout.addWidget(self.tabWidget)

        self.tabWidget.connect(self.tabWidget, QtCore.SIGNAL("currentChanged(int)"), self.tabSelected)

        myBoxLayout = QtGui.QVBoxLayout()
        self.tabWidget.setLayout(myBoxLayout)

        self.tabWidget.addTab(QtGui.QWidget(),'Tab_01')
        self.tabWidget.addTab(QtGui.QWidget(),'Tab_02')
        self.tabWidget.addTab(QtGui.QWidget(),'Tab_03')          


        ButtonBox = QtGui.QGroupBox() 
        ButtonsLayout = QtGui.QHBoxLayout()
        ButtonBox.setLayout(ButtonsLayout)

        Button_01 = QtGui.QPushButton("What Tab?")
        ButtonsLayout.addWidget(Button_01)
        Button_01.clicked.connect(self.whatTab)

        mainLayout.addWidget(ButtonBox)


    def tabSelected(self, arg=None):
        print '\n\t tabSelected() current Tab index =', arg

    def whatTab(self):
        currentIndex=self.tabWidget.currentIndex()
        currentWidget=self.tabWidget.currentWidget()

        print '\n\t Query: current Tab index =', currentIndex


if __name__ == '__main__':
    app = QtGui.QApplication(sys.argv)
    dialog_1 = Dialog_01()
    dialog_1.show()
    dialog_1.resize(480,320)
    sys.exit(app.exec_())