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在我的程序中，我想定义不同的视图来显示我的数据。在我的第一次尝试中，所有视图都在类（QtGui.QWidget）中定义。然而，由于视图的代码开始变得更长，而且我还想添加交互功能，我想将不同的视图分离到单独的类中。

下面是我的第一次尝试。在这里，我只是尝试setCentralWidget在两个视图之间切换。在切换到每个视图之前，我必须生成视图的新实例。否则我会产生一个运行时错误。似乎每个 View 实例一旦不在中心视图中就会被销毁。

我理解对吗？建议的代码结构是否可以，或者如果我这样构造我的代码会出现问题吗？针对此类问题的任何其他建议/最佳实践？

import sys
from PyQt4 import QtGui

class View1Widget(QtGui.QWidget):
    pass
    # Describse View 1 of Data

class View2Widget(QtGui.QWidget):
    pass
    # Describse View 2 of Data

class ApplicationWindow(QtGui.QMainWindow):
    def __init__(self):
        QtGui.QMainWindow.__init__(self)
        self.main_widget = QtGui.QWidget(self)

        # Generate Instances of both views  
        self.View1 = View1Widget(  self.main_widget)
        self.View2 = View2Widget(  self.main_widget)

        # Init Central View
        self.setCentralWidget(self.View1)

        # Focus
        self.main_widget.setFocus()

        self.views_menu = QtGui.QMenu('&Views', self)  
        self.views_menu.addAction('View 1', self.showView1)
        self.views_menu.addAction('View 2', self.showView2)
        self.menuBar().addMenu(self.views_menu)

    def showView1(self):
        "Switches Central Widget to View1"
        self.View1 = View1Widget(  self.main_widget) # Without this line, I would generate a runtime error
        self.setCentralWidget(self.View1)    

    def showView2(self):
        "Switches Central Widget to View2"
        self.View2 = View2Widget(  self.main_widget) # Without this line, I would generate a runtime error
        self.setCentralWidget(self.View2)




if __name__ == '__main__':
    qApp = QtGui.QApplication(sys.argv)
    aw = ApplicationWindow()
    aw.show()
    sys.exit(qApp.exec_())

如果没有标记线，我会在单击查看 2 而不是返回查看 1 后收到以下运行时错误

Exception "unhandled RuntimeError"
wrapped C/C++ object of type View1Widget has been deleted
4

1 回答 1

1

为中央小部件使用堆栈：

import sys
from PyQt4 import QtGui

class ApplicationWindow(QtGui.QMainWindow):
    def __init__(self):
        QtGui.QMainWindow.__init__(self)
        self.stack = QtGui.QStackedWidget(self)
        self.View1 = QtGui.QLabel('View 1', self.stack)
        self.View2 = QtGui.QLabel('View 2', self.stack)
        self.stack.addWidget(self.View1)
        self.stack.addWidget(self.View2)
        self.setCentralWidget(self.stack)
        menu = self.menuBar().addMenu('&Views')
        menu.addAction('View 1', lambda: self.showView(0))
        menu.addAction('View 2', lambda: self.showView(1))

    def showView(self, index):
        self.stack.setCurrentIndex(index)

if __name__ == '__main__':

    qApp = QtGui.QApplication(sys.argv)
    aw = ApplicationWindow()
    aw.show()
    sys.exit(qApp.exec_())
于 2015-02-25T21:48:35.260 回答