How to link signal and slot when i change the font in the dialog

summit

This is how i am currently choosing the font in my application.

![7f1b3861-0298-4d5d-9a6f-952a0bf84303-image.png]
The application uses this code to open the font diaglog

void FontChange()
{

	QString filePath = QFileDialog::getOpenFileName(NULL, tr("Open File"),
		QStandardPaths::standardLocations(QStandardPaths::FontsLocation)[0],
		tr("Fonts (*.ttf);;Everything (*.*)"), nullptr,
		QFileDialog::DontUseNativeDialog);

	if (filePath.isEmpty())
		return;

	QlineEditSetFont->setText(filePath);
	stdstrLocation = filePath.toStdString();
	this->isChanged = true; // this executes the function
}
I want to execute a function whenever i change my selection in the Dialog , currently i  have to choose a font and than click on open to execute the function

Bonnie

Hi, excuse me, but why don't you use QFontDialog to choose font?

summit

@Bonnie said in How to link signal and slot when i change the font in the dialog:

QFontDialog

@Bonnie i am having a look into this option.

summit

@Bonnie It does not work for me as i need to use this font for opengl rendering and i need the path of the font along with its actual name.

Bonnie

And what you need is something like a "live dialog".
So you cannot use the QFontDialog ::getFont static function because it is modal.
I would suggest doing something like:

QFontDialog *fd = new QFontDialog(this);
fd->setAttribute(Qt::WA_DeleteOnClose);
fd->setOption(QFontDialog::NoButtons);
fd->show();
connect(fd, &QFontDialog::currentFontChanged, [=](const QFont &font){
    qDebug() << font;
});

[ADDED]
Even though you cannot use QFontDialog, but the theory is the same.
You cannot use the static function.
You need to create a dialog, and connect the current*Changed signal.

summit

@Bonnie said in How to link signal and slot when i change the font in the dialog:

QFontDialog *fd = new QFontDialog(this);
fd->setAttribute(Qt::WA_DeleteOnClose);
fd->setOption(QFontDialog::NoButtons);
fd->show();
connect(fd, &QFontDialog::currentFontChanged, [=](const QFont &font){
qDebug() << font;
});

@Bonnie thank you , i get your point and will try to use file open with a object.

summit

@Bonnie said in How to link signal and slot when i change the font in the dialog:

modal

@Bonnie how can i print the file path in this code

QFileDialog* dialog = new QFileDialog();	
dialog->setAttribute(Qt::WA_DeleteOnClose);
dialog->setNameFilter("TTF (*.ttf)");
dialog->setOption(QFileDialog::DontUseNativeDialog);
dialog->setDirectory("C:\\Windows\\Fonts");
dialog->show();
	
QObject::connect(dialog, &QFileDialog::currentChanged, [=]() {
		qDebug() << "Changed" << // print the current path; });

Bonnie

@summit

QObject::connect(dialog, &QFileDialog::currentChanged, [=](const QString &path) {
    qDebug() << path;
});

And i've thought about this again, a modal dialog is also usable.

QFileDialog dialog;
dialog.setNameFilter("TTF (*.ttf)");
dialog.setOption(QFileDialog::DontUseNativeDialog);
dialog.setDirectory("C:\\Windows\\Fonts");
//if using a modal dialog, the "connect" should be placed before "exec()"
QObject::connect(&dialog, &QFileDialog::currentChanged, [=](const QString &path) {
    qDebug() << path;
});
dialog.exec();

So it is up to you whether you would like a modal or modaless one.

summit

@Bonnie said in How to link signal and slot when i change the font in the dialog:

QObject::connect(&dialog, &QFileDialog::currentChanged, [=](const QString &path) {
qDebug() << path;
});

@Bonnie Thank you very much this is what i need.