如何连接QLineEdit focusOutEvent

Question

在Designer的帮助下，我用PyQt4设计了一个带有QLineEdit的窗口。我使用pyuic4将.ui转换为.py。我创建了另一个.py文件并导入了Ui_Class并子类化了它。

当QLineEdit失去焦点时，我想执行一些任务。

只需线路按钮点击事件I即可连接QLineEdit失去焦点事件

Answer 1

使用eventFilter

class Filter(QtCore.QObject):
    def eventFilter(self, widget, event):
        # FocusOut event
        if event.type() == QtCore.QEvent.FocusOut:
            # do custom stuff
            print 'focus out'
            # return False so that the widget will also handle the event
            # otherwise it won't focus out
            return False
        else:
            # we don't care about other events
            return False

在你的窗口中：

# ...
self._filter = Filter()
# adjust for your QLineEdit
self.ui.lineEdit.installEventFilter(self._filter)