Add a Widget to QScrollArea

Allerknappe

Hello,

i want to add dynamicaly widgets to a QScrollArea.
With my code i see the Labels, but can not scroll if a widget is outside of the visible scroll window.
I thought first, its because the geometry settings are negativ, but also positive settings won´t work.
Also i want to add the Widgets to an manual Layout.

Maybe some help? Here my code(only the code for the scroll area) :

QScrollArea *scrollArea;
QWidget *scrollAreaWidgetContents;



scrollArea = new QScrollArea(gridLayoutWidget);
scrollArea->setObjectName(QStringLiteral("scrollArea"));
scrollArea->setWidgetResizable(true);

scrollAreaWidgetContents = new QWidget();
scrollAreaWidgetContents->setObjectName(QStringLiteral("scrollAreaWidgetContents"));
scrollAreaWidgetContents->setGeometry(QRect(0, 0, 347, 85));

scrollArea->setWidget(scrollAreaWidgetContents);


QScroller::grabGesture(scrollArea->viewport(), QScroller::LeftMouseButtonGesture);
	
QVariant OvershootPolicy = QVariant::fromValue<QScrollerProperties::OvershootPolicy>(QScrollerProperties::OvershootAlwaysOff);
QScrollerProperties ScrollerProperties = QScroller::scroller(scrollArea->viewport())->scrollerProperties();
ScrollerProperties.setScrollMetric(QScrollerProperties::VerticalOvershootPolicy, OvershootPolicy);
ScrollerProperties.setScrollMetric(QScrollerProperties::HorizontalOvershootPolicy, OvershootPolicy);
QScroller::scroller(scrollArea->viewport())->setScrollerProperties(ScrollerProperties);



for(qint16 i = 0, ic = 0; i < ia ; i++)	//this loop builds the new message area
	{
//      label_2->setGeometry(QRect(30, 30, 131, 41));	geometry of the received messages
//		label_3->setGeometry(QRect(80, 80, 131, 41));	geometry of the own messages
        if(i => label_2.size())
		{
			
            label_2.append(new QLabel(scrollAreaWidgetContents));
            
			if(nachricht[ic].size() > 15)
			{
				sizeright = nachricht[ic].size() -15;
                label_2[i]->setText(nachricht[ic].left(15)+ "/n"+nachricht[ic].right(sizeright));
			}
			else
                label_2[i]->setText(nachricht[ic]);
				
			ic++;
		}

		label_2[i]->show();		// with show the label widget will be visible
		
		label_2[i]->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
        label_2[i]->setGeometry(QRect(recx, 80-50*pos, 131, 41));
		
		
		pos--;
	}

SGaist

Hi,

Since you are not using any layout you have to also resize scrollAreaWidgetContents by hand. I'd recommend changing your current technique by using a QVBoxLayout that you set on scrollAreaWidgetContents and then append your labels to it.

Depending on what you want to do, maybe a QListView with a custom model might be simpler. You may need a QStyledItemDelegate depending on what you want to show and how you want to show it.

Allerknappe

ok SGaust thanks for the post.

i tried to use not an layout, because i want to change the width of the label and it´s maybe smoother without layout...

so i tried to resize the widget with:

 scrollAreaWidgetContents->resize(70,30*pos);
scrollAreaWidgetContents->update();
   scrollArea->setViewport(scrollAreaWidgetContents);

but i get still the same result -.-

mrjj

@Allerknappe said in Add a Widget to QScrollArea:

i want to change the width of the label

Hi
Just as note. With layouts you can always change minimumWidth and get that width
so i would not say its smoother without layouts considering what else they offer :)