I have a QDialog and I read a lot about the differences of show(), exec() and open(). Unfortunately I never found a solved solution to change the modality of a dialog at runtime. I have an application and from there my QDialog is started. I have a toggle button in this dialog and with clicking on it the QDialog should change the modality,so that it is possible to interact with the application - but this shouldn't happen all the time - just when the toggle button is checked.
Is there a possibility? I could not solve the problem with setting setModal(true/false) this just allows me to start it modal, toggle the button and set it to non modal, but then I can't go back to modal.
Here some code:
Starting the dialog:
from the main window:
_dialog = new ToggleModalDialog(this, id, this);
_dialog->setWindowModality(Qt::ApplicationModal);
_dialog->open();
and here in the toggled slot in the ToggleModalDialog
void ToggleModalDialog::changeModality(bool checkState)
{
if(checkState)
{
this->setWindowModality(Qt::NonModal);
ui->changeModalityButton->setChecked(true);
this->setModal(false);
}
else
{
this->setWindowModality(Qt::ApplicationModal);
ui->changeModalityButton->setChecked(true);
}
Thanks in advance!
You can use eitherQDialog::setModal(bool)
or setWindowModality(Qt::ApplicationModal)
. But the documentation of setWindowModality()
says something extra which is..
Changing this property while the window is visible has no effect;
you must hide() the widget first, then show() it again.
So your code should look like following..
void ToggleModalDialog::changeModality(bool checkState)
{
if(checkState)
{
this->setWindowModality(Qt::NonModal);
ui->changeModalityButton->setChecked(true);
}
else
{
this->setWindowModality(Qt::ApplicationModal);
ui->changeModalityButton->setChecked(true);
}
this->hide();
this->show();
}
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