Ask for confirmation in QFileDialog

meikelneit

Hello,

i am using a QFileDialog to load files and create a TreeView out of the files data. But if a new one should be loaded i want the dialog to alert the user that the current TreeView will be deleted, so he has to confirm the loading. As i see in the docs, the QFileDialog::DontConfirmOverwrite is set to default and the cornfirmation is requested. But i dont get access to the dialog and does not show up. Anyone has a hint how i could do that?

I use the code below to call the QFileDialog:

QString l_filePath = QFileDialog::getIpenFileName(this,tr("Load Directory"),QDir::homePath(),("*.db"));

then i pass this filePath to a regular open function.

jsulm

@meikelneit You can pass Options to the dialog: https://doc.qt.io/qt-5/qfiledialog.html#getOpenFileName. It's the last parameter.

sierdzio

@meikelneit said in Ask for confirmation in QFileDialog:

QFileDialog::DontConfirmOverwrite

That confirmation only makes sense when you are trying to save a file. It won't show when you open it.

If you need a custom behaviour like that, use custom QFileDialog, not one of the convenience functions.

meikelneit

Ok thank you.
Do i understand it right when i say, ill have to use my own QDialog *l_dialog = new QDialog;
and then use a slot, which i code myself and it reacts on the QDialog::Accepted() Signal?

mrjj

@meikelneit
Hi
as already mentioned, the Dialog can warn about overwriting files but it wont when loading them, so you could just do

QString l_filePath = QFileDialog::getIpenFileName(this,tr("Load Directory"),QDir::homePath(),("*.db"));
if (!filepath.empty)
QMessageBox::warning(qApp->activeWindow(), "Replace", "Data will be lost. Continue ? ", QMessageBox::Yes|QMessageBox::No);

before actually removing old TreeView

sierdzio

@meikelneit said in Ask for confirmation in QFileDialog:

Ok thank you.
Do i understand it right when i say, ill have to use my own QDialog *l_dialog = new QDialog;
and then use a slot, which i code myself and it reacts on the QDialog::Accepted() Signal?

Yes. But you can create a QFileDialog - it will be much easier than creating custom implementation in "bare" QDialog.

meikelneit

I have a Problem now and i dont get the Point i am missing.

I tryed two Solutions:

QMessageBox l_Warning;
l_Warning.setText("Beim importieren der Datei gehen die aktuellen Daten verloren.");
l_Warning.setStandardButtons(QMessageBox::Yes|QMessageBox::No);
l_Warning.setWindowTitle("Warnung");
QPushButton *l_laden = l_Warning.addButton((tr("Laden"),QMessageBox::Yes));
l_Warning.exec();

if(l_Warning.buttonClicked() == l_laden) here appears an Error: Cant convert QPushButton* to QAbstractButton*
{
…
}

QMessageBox l_Warning;
l_Warning.setText("Beim importieren der Datei gehen die aktuellen Daten verloren.");
l_Warning.setStandardButtons(QMessageBox::Yes|QMessageBox::No);
l_Warning.setWindowTitle("Warnung");
QAbstractButton *l_laden = l_Warning.addButton((tr("Laden"),QMessageBox::Yes)); here appears an Error: Cant convert QAbstractButton* to QPushButton*
l_Warning.exec();

if(l_Warning.buttonClicked() == l_laden)
{
…
}

What am is missing?

PS: I guess its the Action role QMessageBox::Yes, but what else could i set there, i dont see flags in the doc for Abstract Buttons.

jsulm

@meikelneit Shouldn't it be clickedButton()?
If it then still complains then do the cast:

if(l_Warning.buttonClicked() == reinterpret_cast<QAbstractButton*>(l_laden))

meikelneit

Ok thank you, that works. But why do i needthe cast there, in the first step i just copied my Code from the docs, ist exactly like that.
https://doc.qt.io/qt-5/qmessagebox.html see QAbstractButton.

jsulm

@meikelneit What compiler do you use?

meikelneit

I use the Compiler MSVC15