Extend the ui_xxx.h file

[jacek]

So in that case which one is the place-holder that i should promote to?

If your custom class is derived from QWidget, then add a QWidget to your form and promote it.

[dosto.walla]

Thanks jacek,

Drag a QWidget within the Qt Designer and promoted it to the custom class that i have made.


Now i have almost the same error:


QLayout::addChildLayout: layout "gridLayout" already has a parent
Segmentation fault

Another forum said something related to that

"If you want to create a sub-layout (i.e. you want to add it to another
layout), then you have to create it WITHOUT a parent. Just use the
constructor of QLayout without a parent.

Only add a parent (namely the top widget) for a top level layout (i.e. the
main layout of a widget).
"

How do i do that from within the Qt Designer?


In my case the gridLayout is the sub layout. and i have to instantiate that without a parent.

Regards
Sajjad

[jacek]

QLayout::addChildLayout: layout "gridLayout" already has a parent

The problem is that you try to add a layout to a form that already has a layout. Qt doesn't like this.

How do i do that from within the Qt Designer?

Either drag a layout from the toolbox just as if it was a widget or select few widgets and click the "Lay out in ..." action (you should see a red rectangle around those widgets).

[dosto.walla]

Hello jacek,


i am still having the same error. So i am attaching the related files.
I hope that you can make some time out of your busy schedule.


Regards
Sajjad

[dosto.walla]

Hello jacek,

I have attached some screen-shots of the things you have recommended to do to avoid the error:

The image that is attached first shows the following:

1. All the toolbars that are arranged in a grid layout.

2. The rectangle box beside that is a QWidget that i have dragged into the form.


The second image shows how i promoted the custom class RenderArea.h to one of the place-holders(QWidget)

The i compiled them ,but while running i have the runtime error as follows:

QLayout::addChildLayout: layout "gridLayout" already has a parent
Segmentation fault


It says that the gridLayout already has a parent

i followed you suggestion

"Either drag a layout from the toolbox just as if it was a widget or select few widgets and click the "Lay out in ..." action (you should see a red rectangle around those widgets)."


I followed the one in the bold mark. And you can see that in the attached images as well.


Regards
Sajjad

[dosto.walla]

Hi jacek,

Sorry that i could not attach the second image with the previous post

Here i am sending the second image


Regards
Sajjad