python - 如何使用键盘上的Enter关键字将光标从一行编辑移至另一行编辑

这是我在行编辑中设置文本后的示例程序，我想使用键盘输入关键字将光标位置从一行编辑更改为另一行。因此，我编写了按键事件，但此功能仅对一个执行行编辑。任何人都可以帮助我。谢谢您。

下面是我的示例代码：

import sys
from PyQt4 import QtGui,QtCore

class Example(QtGui.QWidget):

    def __init__(self):
        super(Example, self).__init__()

        self.initUI()

    def initUI(self):
        box=QtGui.QVBoxLayout(self)
        self.lbl1 = QtGui.QLineEdit()
        self.lbl1.move(15, 10)
        self.lbl2 = QtGui.QLineEdit()
        self.lbl2.move(35, 40)
        self.lbl3 = QtGui.QLineEdit()
        self.lbl3.move(55, 70)
        box.addWidget(self.lbl1)
        box.addWidget(self.lbl2)
        box.addWidget(self.lbl3)

        self.setGeometry(300, 300, 250, 150)
        self.setWindowTitle('Absolute')
        self.show()
    def keyPressEvent(self, event):

        if event.key() == QtCore.Qt.Key_Return:
            if self.lbl1.setFocus():
                self.lbl2.setFocus()

            elif self.lbl2.setFocus():
                self.lbl3.setFocus()
def main():

    app = QtGui.QApplication(sys.argv)
    ex = Example()
    sys.exit(app.exec_())


if __name__ == '__main__':
    main()

最佳答案

可能的解决方案是使用eventFilter来监听小部件的事件，因此请检查它是否是应用您指示的逻辑的focusWidget：

from PyQt4 import QtCore, QtGui

class Singleton(type(QtCore.QObject), type):
    def __init__(cls, name, bases, dict):
        super(Singleton, cls).__init__(name, bases, dict)
        cls.instance=None

    def __call__(cls,*args,**kw):
        if cls.instance is None:
            cls.instance = super(Singleton, cls).__call__(*args, **kw)
        return cls.instance

class EnterFocusManager(QtCore.QObject): #, metaclass=Singleton):
    __metaclass__ = Singleton

    def __init__(self, parent=None):
        super(EnterFocusManager, self).__init__(parent)
        QtGui.QApplication.instance().installEventFilter(self)
        self._widgets = []

    def eventFilter(self, obj, event):
        if event.type() == QtCore.QEvent.KeyPress and obj == QtGui.QApplication.focusWidget():
            if event.key() == QtCore.Qt.Key_Return:
                f = [(k, v) for k, v in self._widgets if k==obj]
                if f:
                    f[0][1].setFocus(True)
        return super(EnterFocusManager, self).eventFilter(obj, event)

    @staticmethod
    def setEnterOrder(first, second):
        EnterFocusManager()._widgets.append((first, second))


class Example(QtGui.QWidget):
    def __init__(self):
        super(Example, self).__init__()
        self.initUI()

    def initUI(self):
        box = QtGui.QVBoxLayout(self)
        self.lbl1 = QtGui.QLineEdit()
        self.lbl2 = QtGui.QLineEdit()
        self.lbl3 = QtGui.QLineEdit()
        box.addWidget(self.lbl1)
        box.addWidget(self.lbl2)
        box.addWidget(self.lbl3)

        self.setGeometry(300, 300, 250, 150)
        self.setWindowTitle('Absolute')
        self.show()

        EnterFocusManager.setEnterOrder(self.lbl1, self.lbl2)
        EnterFocusManager.setEnterOrder(self.lbl2, self.lbl3)

if __name__ == '__main__':
    import sys
    app = QtGui.QApplication(sys.argv)
    w = Example()
    w.show()
    sys.exit(app.exec_())

关于python - 如何使用键盘上的Enter关键字将光标从一行编辑移至另一行编辑，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/55121511/