How to Promote to a Class at the Runtime

[R_Irudezu]

I have a class for double clicking signal that derived from QLabel and it is ok to promote a QLabel item that drag&dropped in designer.

But I am creating unspecific number of QLabels and QFrames etc. at the runtime. Number of items depends on a list count so it changes all the time. So the items are custom and i want to promote each item to that doubleClick class. Is it possible to do that. Promotion at runtime?

Here is how i create QLabel items:

QGridLayout *listItemsLayout = new QGridLayout;
listItemsLayout ->setColumnStretch(0, 5);
listItemsLayout ->setColumnStretch(1, 5);
listItemsLayout ->setColumnStretch(2, 5);

QList<QFrame *> frames; 
QList<QLabel *> labels;
QList<QLabel *> infoTextLabels;

for(int i = 0; i < aListCountVariable; i++)
{
    frames << new QFrame(ui->PageWidget1);
    labels << new QLabel(frames.at(i));
    infoTextLabels << new QLabel(frames.at(i));

    // other details, specifying labels and frames sizes, qss etc
    /* ... */
}

ui->containerWidget->setLayout(listItemsLayout );

[Christian Ehrlicher]

What items are 'custom'? Do you have a custom class derived from QLabel/QWidget? If so why not simply instantiate them?

[R_Irudezu]

@Christian-Ehrlicher said in How to Promote to a Class at the Runtime:

instantiate

I think i used wrong word. What I tried to mean by saying custom is, the items are not created in designer. They had been created by code like i post above as code.

I have a doubleClick class. And i can promote the designer added widgets to that class and i'm connecting them like this in the MainWindow constructor:

    connect(ui->testLabel1, SIGNAL(Mouse_DoubleClick()), this, SLOT(Mouse_DoubleClick()));
    connect(ui->testLabel2, SIGNAL(Mouse_DoubleClick()), this, SLOT(Mouse_DoubleClick()));

It's working properly. Now i want to do the same to the labels or frames created by code like above. I don't how how to do, how to promote them to doubleClick class and how to connect them. Need help on this point.

[jsulm]

@R_Irudezu There is actually nothing to promote at runtime. You simply create your doubleClick instances instead of label.

doubleClick tmp = new doubleClick(parent);
connect(tmp, SIGNAL(Mouse_DoubleClick()), this, SLOT(Mouse_DoubleClick()));

[R_Irudezu]

@jsulm Actually i didn't know there is no promote at runtime, but i also couldn't guess the solution is that easy. Thanks @jsulm

Thank you @Christian-Ehrlicher

Solution for my case:

labels << new doubleClick(frames.at(i));
labels.last()->connect(labels.last(), SIGNAL(Mouse_Pressed()), this, SLOT(Mouse_Pressed()));

It works but i don't it is the efficient way or not.

[jsulm]

This post is deleted!

[jsulm]

@R_Irudezu said in How to Promote to a Class at the Runtime:

It works but i don't it is the efficient way or not.

Sure it is. But you can remove "labels.last()->" in front of connect() call.

[Christian Ehrlicher]

@R_Irudezu said in How to Promote to a Class at the Runtime:

connect(labels.last(), SIGNAL(Mouse_Pressed()), this, SLOT(Mouse_Pressed()));

And please use the new signal/slot syntax: https://wiki.qt.io/New_Signal_Slot_Syntax - it helps you to catch errors which would only be visible on runtime otherwise.

[R_Irudezu]

@Christian-Ehrlicher Good to know that, thanks for notifying me.