ui detect mouse event on objects

[Pfanne]

@medyakovvit

 // you can use toggled() or clicked()
    connect(cb, &QCheckBox::toggled, cb, [id, i](bool checked)) {
        // here you have 'i' 

what exactly happend here?
you connect the checkbox toggled/clicked event to ???
Where can I catch this event for further use?

[mpergand]

@Pfanne said in ui detect mouse event on objects:

what exactly happend here?

It is a lambda expression, see HERE

[JonB]

@Pfanne
It's a C++ lambda, like an "anonymous function". Search for lambda on https://wiki.qt.io/New_Signal_Slot_Syntax. @mpergand uses it here to pass the i value from the for loop for you to use in the lambda code, which identifies which checkbox has been toggled.

[Pfanne]

@mpergand

I take a look at QButtonGroup, this look like the right object for my usecase.
I tryed this:

*.h

private slots:
    void on_ioGroup_clicked(int id);

MainWindow::MainWindow(QWidget* parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)

{
    ui->setupUi(this);
    QButtonGroup* ioGroup = new QButtonGroup(this);
    ioGroup->addButton(ui->IO_1, 1;
    ioGroup->addButton(ui->IO_2, 2);
    
    connect(ioGroup, SIGNAL(buttonClicked(int)), this, SLOT(on_ioGroup_clicked(int)));
}

----

void MainWindow::on_ioGroup_clicked(int id) {
    qDebug() << "id clicked" << id;
}
    ```

but "on_ioGroup-clicked" will not be executed by clicking on  IO_1 or IO_2.

[JonB]

@Pfanne
Use the "modern" syntax for yourconnect()s and you would see there is no buttonClicked(int) with int parameter signal. OTOH there is a QButtonGroup::idClicked(int id) signal.

[Pfanne]

@JonB

yes, I also saw that "buttonClicked(int)" is not up to date!

this worked:

connect(ioGroup, &QButtonGroup::idClicked, this, MainWindow::on_ioGroup_clicked);

this not:

    connect(ioGroup, &QButtonGroup::idClicked(int id), this, MainWindow::on_ioGroup_clicked(int id));

[Pfanne]

@Pfanne

finaly this worked:

    connect(ioGroup, SIGNAL(idClicked(int)), this, SLOT(on_ioGroup_clicked(int)));

void MainWindow::on_ioGroup_clicked(int id) {
    qDebug() << "id clicked" << id;
    QAbstractButton* cb = ioGroup->button(id);
    qDebug() << "Object" << cb->objectName();
}

[JonB]

@Pfanne said in ui detect mouse event on objects:

this worked:
connect(ioGroup, &QButtonGroup::idClicked, this, MainWindow::on_ioGroup_clicked);

Correct.

finaly this worked:
connect(ioGroup, SIGNAL(idClicked(int)), this, SLOT(on_ioGroup_clicked(int)));

Since you had it correct first why change it?

[mpergand]

@Pfanne said in ui detect mouse event on objects:

connect(ioGroup, &QButtonGroup::idClicked, this, MainWindow::on_ioGroup_clicked);

You must specify an adress (&) here:
&MainWindow::on_ioGroup_clicked);

[JonB]

@mpergand said in ui detect mouse event on objects:

&MainWindow::on_ioGroup_clicked);

OIC I missed that when OP said it was correct.

[mpergand]

Hi @JonB

Off topic question :
How to set text color as you do in red in your posts ?

[Pl45m4]

@mpergand said in ui detect mouse event on objects:

How to set text color as you do in red in your posts ?

` Text ` = Text

[JonB]

@mpergand said in ui detect mouse event on objects:

How to set text color as you do in red in your posts ?

Interesting. I don't know and have never set a text color in any of my posts! :) @Pl45m4 post above with red text for Text is the first time I have seen any color.

Oh, hang on! Like buttonClicked()? LMAO, until today's forum update that was in green, no wonder I didn't know about red! The "color" is just up to the forum style. The important thing is that code is in monospace font. Use the Code icon (</>) when you are typing in. Or

`in-line codecharacters`

```

multiline code
multiline code

```
First one is single-backtick inline, second one is triple-backtick above and below block.

[Pl45m4]

@JonB said in ui detect mouse event on objects:

Interesting. I don't know and have never set a text color in any of my posts! :) @Pl45m4 post above with red text for Text is the first time I have seen any color.

I use this text format every time I mention some Qt term or class. QPushButton, QObject, Q_OBJECT.
So did/do you ;-)
I don't know what exactly you did when writing these posts, but I used single backticks (don't know how they are called)
` QPushButton ` (now escaped to make them visible)

LMAO, until today's forum update that was in green, no wonder I didn't know about red

I could swear it was red before, with some kind of red-ish background.
At least when used outside of a code section in regular paragraphs.

[JonB]

@Pl45m4 Maybe. Whatever I thought the original question was how to write in red, rather than in monospace which happens to show as red!

[mpergand]

@Pl45m4
Thanks for the tip :)

I finally found the Help button I was looking for yesterday that describes the markdown syntax.

[Pfanne]

@JonB
the first version:

connect(ioGroup, &QButtonGroup::idClicked, this, MainWindow::on_ioGroup_clicked);

is without the object ID, implementing the ID in this version a error occurse.

[mpergand]

@Pfanne said in ui detect mouse event on objects:

connect(ioGroup, &QButtonGroup::idClicked, this, MainWindow::on_ioGroup_clicked);

As I said earlier, you have to pass an address:

connect(ioGroup, &QButtonGroup::idClicked, this, &MainWindow::on_ioGroup_clicked);

[JonB]

@Pfanne

@JonB said in ui detect mouse event on objects:

@mpergand said in ui detect mouse event on objects:

&MainWindow::on_ioGroup_clicked);

OIC I missed that when OP said it was correct.

You can see for yourself (when it's written in monospace) that in your
connect(ioGroup, &QButtonGroup::idClicked, this, MainWindow::on_ioGroup_clicked);

one method reference has a preceding & and the other does not, and thereby tell what you had is not correct.

[Pfanne]

@JonB

connect(ioGroup, &QButtonGroup::idClicked, this, MainWindow::on_ioGroup_clicked);

OK, I think I understand, but this try worked, without ID but it creates a event on every click.
Without the reference (&) to MainWindow....

But it´s OK, this try:

connect(ioGroup, SIGNAL(idClicked(int)), this, SLOT(on_ioGroup_clicked(int)));

is exactly the way that I use (SIGNAL -> SLOT) for my other connections.

Thanks for your support!