15

有没有办法结合textChanged和editingFinishedfor QLineEdit？问题是editingFinished即使我只将光标移开QLineEdit而没有任何更改也会发出。而我只想在完成编辑后执行任何更改时才发出信号。

我可以想象只将当前文本存储在某个地方，将输入的文本与它进行比较，并且只有在它不同时才做某事。但我想知道是否有任何纯粹基于信号处理的解决方案。

编辑：最后我必须存储当前文本并与新文本进行比较，而不是遵循建议的解决方案。我意识到在我的应用程序中“1.2345”和“1.23”将是相同的文本，但在这种情况下我必须更新一些其他值等等。我非常感谢@Avaris 和@ekhumoro 的详细回答和评论，并且会接受它，因为它似乎解决了最初发布的问题。

4

2 回答 2

15

编辑

对于捕获手动编辑：

class MyLineEdit(QtGui.QLineEdit):
    textModified = QtCore.pyqtSignal(str, str) # (before, after)

    def __init__(self, contents='', parent=None):
        super(MyLineEdit, self).__init__(contents, parent)
        self.returnPressed.connect(self.checkText)
        self._before = contents

    def focusInEvent(self, event):
        if event.reason() != QtCore.Qt.PopupFocusReason:
            self._before = self.text()
        super(MyLineEdit, self).focusInEvent(event)

    def focusOutEvent(self, event):
        if event.reason() != QtCore.Qt.PopupFocusReason:
            self.checkText()
        super(MyLineEdit, self).focusOutEvent(event)

    def checkText(self):
        if self._before != self.text():
            self._before = self.text()
            self.textModified.emit(self._before, self.text())

编辑 2

用于捕获所有编辑（编程和手动）：

class MyLineEdit(QtGui.QLineEdit):
    textModified = QtCore.pyqtSignal(str, str) # (before, after)

    def __init__(self, contents='', parent=None):
        super(MyLineEdit, self).__init__(contents, parent)
        self.editingFinished.connect(self.checkText)
        self.textChanged.connect(lambda: self.checkText())
        self.returnPressed.connect(lambda: self.checkText(True))
        self._before = contents

    def checkText(self, _return=False):
        if (not self.hasFocus() or _return) and self._before != self.text():
            self._before = self.text()
            self.textModified.emit(self._before, self.text())

编辑 3

仅捕获用户的文本更改：

class MyLineEdit(QtGui.QLineEdit):
    textModified = QtCore.pyqtSignal(str, str) # (before, after)

    def __init__(self, contents='', parent=None):
        super(MyLineEdit, self).__init__(contents, parent)
        self.editingFinished.connect(self.__handleEditingFinished)
        self.textChanged.connect(self.__handleTextChanged)
        self._before = contents

    def __handleTextChanged(self, text):
        if not self.hasFocus():
            self._before = text

    def __handleEditingFinished(self):
        before, after = self._before, self.text()
        if before != after:
            self._before = after
            self.textModified.emit(before, after)
于 2012-08-29T16:42:04.997 回答
9

如果您只想检测是否进行了任何更改（而不是文本是否与开始的方式不同），您可以使用信号的modified属性：QLineEditeditingFinished

    self.edit = QtGui.QLineEdit(self)
    self.edit.editingFinished.connect(self.handleEditingFinished)
    ...

def handleEditingFinished(self):
    if self.edit.isModified():
        # do interesting stuff ...
        print 'Editing Finished'
    self.edit.setModified(False)
于 2012-08-29T18:33:12.513 回答