On Sun, 3 Mar 2019 at 15:57, Maurizio Berti <maurizio.berti at gmail.com>
wrote:
> Il giorno sab 2 mar 2019 alle ore 21:02 Sibylle Koczian <
>nulla.epistola at web.de> ha scritto:
>>> How can I get a QDateEdit to show an empty date, or how can I clear the
>> date it shows?
>> [...]
>> Of course I can replace the QDateEdit with a QLineEdit and work with a
>> string representation of the date column throughout. Is that the only
>> solution?
>>>> QDateTimeEdit and its inherited QDateEdit/QTimeEdit all inherit from
> QAbstractSpinBox, which contains a "private" QLineEdit.
> While that is not publicly accessible, you can just use findChild() to get
> its reference.
> Here's a small example you can implement in a model view by using a
> delegate and checking for the data in the setEditorData() method:
>> class ClearableDateEdit(QtWidgets.QDateEdit):
> def __init__(self, *args, **kwargs):
> QtWidgets.QDateEdit.__init__(self, *args, **kwargs)
> self.lineEdit = self.findChild(QtWidgets.QLineEdit)
> self.clear()
>> def clear(self):
> self.lineEdit.setText('')
>>> class Widget(QtWidgets.QWidget):
> def __init__(self):
> QtWidgets.QWidget.__init__(self)
> layout = QtWidgets.QGridLayout()
> self.setLayout(layout)
> dateEdit = ClearableDateEdit()
> layout.addWidget(dateEdit)
> clearButton = QtWidgets.QPushButton('Clear date')
> layout.addWidget(clearButton)
> clearButton.clicked.connect(dateEdit.clear)
>> There are some things you've to take into account, anyway, most
> importantly whenever the focus is get or lost or the cell is changed, which
> will require some control over the DateEdit widget *changed() signals and
> methods like dateTimeFromText(), and finally check everything before using
> setModelData.
>> Maurizio
>> --
> 脠 difficile avere una convinzione precisa quando si parla delle ragioni
> del cuore. - "Sostiene Pereira", Antonio Tabucchi
> http://www.jidesk.net
> _______________________________________________
> PyQt mailing list PyQt at riverbankcomputing.com>/mailman/listinfo/pyqt>
You cannot have an empty QDateEdit, as per my topic long ago at
https://forum.qt.io/topic/86749/qdateedit-qabstractspinbox-blank-empty-value-problem
.
I had to deal with this. I did not take @Maurizio's approach. I do not
know what his solution does about QDateEdit.setData/data() for an empty
date, and other things. Until now I didn't know you could get at its
QLineEdit. For my part I chose to have a QLineEdit plus an associated ...
button to its right which leads to a modal dialog. I paste extracts below,
feel free to cannibalise it if you want my approach. If @Maurizio wishes
to criticize mine, that's fine, I will read and consider!
class JDateEdit(QWidget):
# Class to display an "editable date" widget
# It consists of a QLineEdit plus a "..." QPushButton
# which brings up a (modal) dialog to pick a date to copy into the line edit
# We have to use our own class and not the native Qt
"QDateEdit"+setCalendarPopup(True)
# because that does not allow a "blank/empty" date in any form,
# and we do need blank all over the place
# class variable for "editingFinished" signal
editingFinished = QtCore.pyqtSignal(name='editingFinished')
def __init__(self, parent=None):
super().__init__(parent)
self.minimumDate = None
self.maximumDate = None
# lineEdit holds the date
self.lineEdit = JLineEdit(self)
# "..." button, when clicked will bring up a dialog with a
QCalendarWidget
self.button = JDotDotDotButton(self)
# connect self.lineEdit.editingFinished signal to
self.editingFinished signal
self.lineEdit.editingFinished.connect(self.editingFinished)
layout = QHBoxLayout(self)
layout.setContentsMargins(0, 0, 0, 0)
layout.setSpacing(0)
layout.addWidget(self.lineEdit)
layout.addWidget(self.button)
layout.addStretch(1)
self.setLayout(layout)
self.button.clicked.connect(self.doDialog)
self.dialog = None
def doDialog(self):
self.dialog = JCalendarDialog(self.button)
if self.minimumDate:
self.dialog.calendar.setMinimumDate(self.minimumDate)
if self.maximumDate:
self.dialog.calendar.setMaximumDate(self.maximumDate)
date = self.date()
if date is not None:
self.dialog.setSelectedDate(pyDateToQDate(date))
pos = self.button.rect().topLeft()
pos = self.button.mapToGlobal(pos)
self.dialog.move(pos)
if self.dialog.exec():
date = qDateToPyDate(self.dialog.selectedDate())
# copy the selected date to the line edit
self.setDate(date)
# and emit the editingFinished signal
self.lineEdit.editingFinished.emit()
self.dialog = None
def setReadOnly(self, ro: bool):
self.lineEdit.setReadOnly(ro)
if ro:
self.button.hide()
else:
self.button.show()
def setDate(self, date: typing.Union[datetime.date, None]):
# Set the date
# Accepts None for the date, and sets it blank
if date is None:
self.lineEdit.setText("")
else:
self.lineEdit.setText(dateToStr(date))
def date(self) -> typing.Union[datetime.date, None]:
# Return the date
# If the date is blank, or if it fails to parse in
parseDateSoft(), return None
text = self.lineEdit.text()
if text == "":
return None
return parseDateSoft(text)
def dateOrWarn(self) -> typing.Union[datetime.date, None]:
# Return the date, which *should* be filled in
# If the date is blank, or if it fails to parse,
# put up an ErrorMsgBox() and then return None
text = self.lineEdit.text()
return parseDateHard(text, self.lineEdit)
def dateOrError(self) -> datetime.date:
# Return the date, which *must* be filled in
# If the date is blank, or if it fails to parse,
# put up an ErrorMsgBox() and then raise an exception
text = self.lineEdit.text()
date = parseDateHard(text, self.lineEdit)
if date is None:
raise ValueError("Valid date required")
return date
def clear(self):
self.lineEdit.clear()
def setText(self, a0: str):
self.lineEdit.setText(a0)
def text(self) -> str:
return self.lineEdit.text()
def setMinimumDate(self, date: typing.Union[datetime.date, None]):
self.minimumDate = date
def setMaximumDate(self, date: typing.Union[datetime.date, None]):
self.maximumDate = date
--
Kindest,
Jonathan
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‘She has never mentioned her father to me. Was he—well, the sort of man whom the County Club would not have blackballed?’ "We walked by the side of our teams or behind the wagons, we slept on the ground at night, we did our own cooking, we washed our knives by sticking them into the ground rapidly a few times, and we washed our plates with sand and wisps of grass. When we stopped, we arranged our wagons in a circle, and thus formed a 'corral,' or yard, where we drove our oxen to yoke them up. And the corral was often very useful as a fort, or camp, for defending ourselves against the Indians. Do you see that little hollow down there?" he asked, pointing to a depression in the ground a short distance to the right of the train. "Well, in that hollow our wagon-train was kept three days and nights by the Indians. Three days and nights they stayed around, and made several attacks. Two of our men were killed and three were wounded by their arrows, and others had narrow escapes. One arrow hit me on the throat, but I was saved by the knot of my neckerchief, and the point only tore the skin a little. Since that time I have always had a fondness for large neckties. I don't know how many of the Indians we killed, as they carried off their dead and wounded, to save them from being scalped. Next to getting the scalps of their enemies, the most important thing with the Indians is to save their own. We had several fights during our journey, but that one was the worst. Once a little party of us were surrounded in a small 'wallow,' and had a tough time to defend ourselves successfully. Luckily for us, the Indians had no fire-arms then, and their bows and arrows were no match for our rifles. Nowadays they are well armed, but there are[Pg 41] not so many of them, and they are not inclined to trouble the railway trains. They used to do a great deal of mischief in the old times, and many a poor fellow has been killed by them." As dusk came on nearly the whole population of Maastricht, with all their temporary guests, formed an endless procession and went to invoke God's mercy by the Virgin Mary's intercession. They went to Our Lady's Church, in which stands the miraculous statue of Sancta Maria Stella Maris. The procession filled all the principal streets and squares of the town. I took my stand at the corner of the Vrijthof, where all marched past me, men, women, and children, all praying aloud, with loud voices beseeching: "Our Lady, Star of the Sea, pray for us ... pray for us ... pray for us ...!" It had not occurred to her for some hours after Mrs. Campbell had told her of Landor's death that she was free now to give herself to Cairness. She had gasped, indeed, when she did remember it, and had put the thought away, angrily and self-reproachfully. But it returned now, and she felt that she might cling to it. She had been grateful, and she had been faithful, too.[Pg 286] She remembered only that Landor had been kind to her, and forgot that for the last two years she had borne with much harsh coldness, and with a sort of contempt which she felt in her unanalyzing mind to have been entirely unmerited. Gradually she raised herself until she sat quite erect by the side of the mound, the old exultation of her half-wild girlhood shining in her face as she planned the future, which only a few minutes before had seemed so hopeless. After he had gloated over Sergeant Ramsey, Shorty got his men into the road ready to start. Si placed himself in front of the squad and deliberately loaded his musket in their sight. Shorty took his place in the rear, and gave out: The groups about each gun thinned out, as the shrieking fragments of shell mowed down man after man, but the rapidity of the fire did not slacken in the least. One of the Lieutenants turned and motioned with his saber to the riders seated on their horses in the line of limbers under the cover of the slope. One rider sprang from each team and ran up to take the place of men who had fallen. "As long as there's men and women in the world, the men 'ull be top and the women bottom." Then, in the house, the little girls were useful. Mrs. Backfield was not so energetic as she used to be. She had never been a robust woman, and though her husband's care had kept her well and strong, her frame was not equal to Reuben's demands; after fourteen years' hard labour, she suffered from rheumatism, which though seldom acute, was inclined to make her stiff and slow. It was here that Caro and Tilly came in, and Reuben began to appreciate his girls. After all, girls were needed in a house—and as for young men and marriage, their father could easily see that such follies did not spoil their usefulness or take them from him. Caro and Tilly helped their grandmother in all sorts of ways—they dusted, they watched pots, they shelled peas and peeled potatoes, they darned house-linen, they could even make a bed between them. HoME一级毛片视频免费公开
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