[SOLVED]Making QHBoxLayout scrollable

mehdi.nine

I need to add Textedit in run-time to a QHBoxLayout so I need add scroll to it. for this purpose I need to add QHBoxLayout to a parent (here:Qt: making QHBoxLayout scrollable) and add parent to Qscrollarea.

This is my code:
@
QHBoxLayout *onelinewidget = new QHBoxLayout();
QLabel l = new QLabel("slaam");
QList<QObject> list;
list.append(l);
ui->widget->children().append(list);
@

But it has following error:
@
C:\Qt\Qt5.0.1\Tools\QtCreator\bin\untitled4\mainwindow.cpp:43: error: passing
'const QObjectList {aka const QList<QObject*>}' as 'this' argument of 'void
QList<T>::append(const QList<T>&) [with T = QObject*]' discards qualifiers
[-fpermissive]
@
Any ideas?

Mario84

I suppose ui->widget is your scrollarea, so you should do something like this:
@
ui->widget->setLayout(onelinewidget);
foreach(QWidget *p, list) //use a list of QWidgets instead of QObjects
{
onelinewidget->addWidget(p);
}
@

You cannot modify the list returned by QObject::children() because it is const

mehdi.nine

Mr.Universe you are right. but i want add layout to the widget until i can add widget to the scroll area
see this:

@
for (int lineNumber = 0; lineNumber < 2; ++lineNumber)
{
QWidget *oneLineWidget = new QWidget(this);
QHBoxLayout *oneLineWidgetLayout = new QHBoxLayout();
{ //added these brackets just for the ease of reading.
QLabel *labFirst = new QLabel(tr("first label"), oneLineWidget);
QLabel *labSecond = new QLabel(tr("second label"), oneLineWidget);
QPushButton *bFirst = new QPushButton(tr("first button"), oneLineWidget);
QPushButton *bSecond = new QPushButton(tr("second button"), oneLineWidget);

        oneLineWidgetLayout->addWidget(labFirst);
        oneLineWidgetLayout->addWidget(labSecond);
        oneLineWidgetLayout->addWidget(bFirst);
        oneLineWidgetLayout->addWidget(bSecond);




    }
    oneLineWidget->setLayout(oneLineWidgetLayout);

    ui->verticalLayout->addWidget(oneLineWidget);
}

@

when the lines increase i need to use scroll area@ but i can't add layout to the scroll area directly@ for this purpose i need add layout to a parent widget like Qwidget and add it to the scroll area.
do you have idea for this ?

raven-worx

You need another QWidget and set a QVBoxLayout to it and add there "oneLineWidget" instances one by one in your loop.
Add the created widget then as content to your scrollarea.

Hope i got you right..

Mario84

[quote author="mehdi.nine" date="1366274211"]but i can't add layout to the scroll area directly[/quote]

That's correct: QScrollArea takes exactly ONE widget...
So you have to create a container widget, give it a vertical layout and add your oneLineWidgets to this layout.
(You could also omit oneLineWidget and add oneLineWidgetLayout directly to the vertical layout of the container widget using QBoxLayout::addLayout() )

*Edit:
Of course this is the same as what raven-worx said... took me too long to write so I didn't see it ;)

mehdi.nine

thanks for your replies. but my problem is that i can't add any layout to Qwidget. Qwidget only have children.append() function and don't have addlayout. how i add my layouts to Qwidget until i can add Qwidget to scroll area?

raven-worx

QWidget::setLayout()
and
QScrollArea::setWidget()

mehdi.nine

thanks of all.my problem has solved.