有没有办法将textChanged
和editingFinished
合并为QLineEdit
?问题是,即使我只将光标移离editingFinished
而没有任何更改,也会发出QLineEdit
。而我只想在完成编辑后执行任何更改时才发出信号。
我可以想象只存储当前文本的某个地方,将输入的文本与它进行比较,并且仅在它不同时才执行某些操作。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“1.2345”和“1.23”将是相同的文本但是我必须在这种情况下更新一些其他值,依此类推。我非常感谢@Avaris和@ekhumoro的详细解答和评论,并且会接受它,因为它似乎解决了最初发布的问题。
答案 0 :(得分:12)
修改强>
用于捕获手动编辑:
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())
修改2
用于捕获所有编辑(程序和手动):
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
用于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)
答案 1 :(得分:6)
如果您只想检测是否已进行任何更改(而不是文本是否与其启动方式不同),您可以使用modified
属性{ {1}} editingFinished
信号:
QLineEdit