QScrollArea With Custom Widgets

[VireX]

Ok let's say you have a program like structured like this:

CObject Objects in the table, like 25
CTable Table for QScrollArea
main where you display QScrollArea

In CTable you do this (assume all objects declared):

CTable::CTable(QWidget *parent) : QWidget(parent) {
 iObjects = 25;
 QGridLayout *lay = new QGridLayout;
 setLayout(lay);
 for(int i = 0; i < iObjects; i++){
   buttons << new QPushButtons(QString("%1").arg(i));
  } 
}
void CTable::resizeEvent(QResizeEvent *evt){
 // ASSUME XPOS AND YPOS ARE CORRECTLY DECLARED
 for(int i = 0; i < iObjects; i++){
  buttons[i]->move(xpos*150+10, ypos*101+10);
 }
}

CTable::CTable(QWidget *parent) : QWidget(parent) {
 iObjects = 25;
 QGridLayout *lay = new QGridLayout;
 setLayout(lay);
 for(int i = 0; i < iObjects; i++){
   buttons << new QPushButtons(QString("%1").arg(i));
  } 
}
void CTable::resizeEvent(QResizeEvent *evt){
 // ASSUME XPOS AND YPOS ARE CORRECTLY DECLARED
 for(int i = 0; i < iObjects; i++){
  buttons[i]->move(xpos*150+10, ypos*101+10);
 }
}

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And in main

QScrollArea* qs = new QScrollArea;
qs->setWidget(ctable);

QScrollArea* qs = new QScrollArea;
qs->setWidget(ctable);

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Code has been shortened for clarity!!!

The idea here is, I am building 25 custom widgets (I used buttons here for simplicity, with a QList), and they have to automatically resize and list themselves (the dimensions are 150 by 100), like as if you would see a test with problems in them. It will go like this:

1 2 3 4 5
6 7 8 9 10
11 12.....

Problem is when I compile this code, it will not show the objects, it will show them all in one spot (so all 25 are in same spot so you only see ONE).

Need help please.

[aamer4yu]

Where are u adding the buttons to the grid layout ??

[VireX]

I'm not... but I am declaring the pushbuttons as parent "this".
but I have tried addWidget on each, but didn't get me very far.

[jpn]

I'd suggest reading about Layout Classes.

[marcel]

Are you creating the buttons directly in the scroll area?
If so, it's not OK. You must create another widget that you will set as the scroll area contents with QScrollArea::setWidget and then create your buttons with this widget as parent. Also, the grid layout must be set for this widget.

Regards

[jpn]

You must create another widget that you will set as the scroll area contents with QScrollArea::setWidget and then create your buttons with this widget as parent.

He is doing so:

QScrollArea* qs = new QScrollArea;
qs->setWidget(ctable);

QScrollArea* qs = new QScrollArea;
qs->setWidget(ctable);

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Also, the grid layout must be set for this widget.

He is doing that too:

QGridLayout *lay = new QGridLayout;
setLayout(lay);

QGridLayout *lay = new QGridLayout;
setLayout(lay);

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It's just the actual usage of the layout that's missing.

[VireX]

I would suggest... you're right.

But see, when I do this:
lay->addWidget(cobject[i]);

and then compile...
All I see is one widget (I believe the others are underneath it).

move I guess doesn't work with QGridLayout, but I tried removing QGridLayout, and it seems thats not the problem. So I'm wondering... is move a useless function that only works when it feels like it?

[jpn]

Use QGridLayout::addWidget() which takes a row and column number. Oh, and you can forget about resizing and moving by hand when a layout is in use.

[wysota]

Shouldn't the layout be applied on the viewport and not directly on the scroll area?

[jpn]

Shouldn't the layout be applied on the viewport and not directly on the scroll area?

But then it wouldn't make any sense to use a scroll area? His layout is applied on the widget inside the scroll area as I see is correct.

[wysota]

Oh, right. I didn't notice that.