Beginner question: How to tell when Dialog is exposed?

[Pablo J. Rogina]

@mstoth how are you displaying the dialogs, in particular the second one?
From documentation:

The most common way to display a modal dialog is to call its exec() function. When the user closes the dialog, exec() will provide a useful return value.

[mstoth]

These are not modal.
In the first dialog, the onRelease handler for one of the buttons is

void MainMenu::on_configureConsoleButton_released()
{
    dc=new DialogConsoleConfigA(this);
    dc->show();
}

DialogConsoleConfigA covers the main menu dialog.
Then when DialogConsoleConfigA is removed,

void DialogConsoleConfigA::on_pushButton_released()
{
    this->hide();
}

Now the first dialog is exposed again. I need to find a way for the MainMenu dialog to be aware that the DialogConsoleConfigA dialog has been hidden.

[Taz742]

@mstoth
use signal slot mechanism.

Dialog *dialog = new Dialog;
connect(dialog, &Dialog::rejected, this, [=](){
    //something
});
dialog->show();

or in your Dialog class listen a closeEvent:

void Dialog::closeEvent (QCloseEvent *event) {
     emit closed();
event->accept();
}

.h file:

signals:
void closed();

protected:
void closeEvent(QCloseEvent *event);

Dialog *dialog = new Dialog;
connect(dialog, &Dialog::closed, this, [=](){
    //something
});
dialog->show();

[Diracsbracket]

This post is deleted!

[Diracsbracket]

@Taz742 said in Beginner question: How to tell when Dialog is exposed?:

connect(dialog, &Dialog::rejected, this, =

Hi, why rejected?

[Taz742]

@Diracsbracket
When form 'X' button click, when a dialog is closed QDialog does not call a rejected signal ?

[Diracsbracket]

@Taz742 said in Beginner question: How to tell when Dialog is exposed?:

When form 'X' button click, when a dialog is closed QDialog does not call a rejected signal

Yes, but when you reject a config dialog, then that usually means nothing needs to be done...? I would have used the accepted() signal. But hey, let's wait and see what exactly @mstoth has in mind.

[Taz742]

@Diracsbracket
I think no one is right, he only wants to hide the dialog? Waiitt ))

[Diracsbracket]

@Taz742 said in Beginner question: How to tell when Dialog is exposed?:

he only wants to hide the dialog

@mstoth said in Beginner question: How to tell when Dialog is exposed?:

when that second panel goes away, my first dialog needs to check a parameter

I think he wants to check if any of the settings were changed when the dialog was closed^^. In any case, thanks for posting the solution!

[mstoth]

Indeed, all I need to do is see if something has happened when the first dialog is visible again. I thought about signals/slots but there is more than one case where this first dialog becomes visible again. For instance, the first dialog has 6 buttons, each presents a different new dialog. When any of those appear, they hide the first one. To use signals, i'd have to connect to each of those 6 dialogs.

I was hoping for something more elegant like a event handler I could override in the first dialog that gets called when the first dialog becomes visible again. (something like onExposed()) . I have not seen anything like that.

Thanks by the way for all the help! I appreciate your thoughts.

[Taz742]

@mstoth
Good! I think you have an idea of what to do. Then mark this topic to be solved.

[mstoth]

ok, so my solution is to use signals to indicate the condition i'm interested in. It's a bit messy since there are so many places I need to connect to but from what I'm hearing, that is the only way.

I'll mark it as solved but unfortunately it is not the kind of solution I was hoping for. If anyone else has a more elegant way of handling this feel free to let me know.

I do appreciate everyone's time and effort on this problem! Thank you very much.