QScrollArea not showing scrollbars and messing widgets

esdrasbeleza

Hi folks,

I have a widget with a margin of 8px. Inside it, I have a QVBoxLayout having only a QScrollArea. (Sounds stupid, but I did it because I can't find a way to separate the QScrollArea of the widget borders. Otherwise, I'd have only a QScrollArea with the VBoxLayout inside.)

Now the real problem: the QScrollArea contains another QVBoxLayout. But when I resize the window, it's contents cannot be seen and I don't get any scrollbar.

The normal widget is this (does anyone here like Cardigans?):

!http://img28.imageshack.us/img28/9400/widgetnormal.png(Widget normal)!

And the resized widget is this:

!http://img130.imageshack.us/img130/8243/widgetresized.png(Widget resized)!

The current code:

@
setContentsMargins(QMargins(8, 8, 8, 8));
QScrollArea *scrollArea = new QScrollArea(this);
scrollArea->setFrameStyle(QFrame::StyledPanel | QFrame::Raised);
scrollArea->setMidLineWidth(2);
scrollArea->setLineWidth(2);

// Set background and foreground colors
QPalette contextPalette = scrollArea->palette();
contextPalette.setBrush(backgroundRole(), QColor(255,255, 255));
contextPalette.setColor(foregroundRole(), QColor(100,100,100));
scrollArea->setPalette(contextPalette);
scrollArea->setAutoFillBackground(true);

artistLabel = new QLabel(this);
artistLabel->setWordWrap(true);
QFont artistFont = artistLabel->font();
artistFont.setBold(true);
artistFont.setPointSize(artistFont.pointSize() + 4);
artistLabel->setFont(artistFont);
artistLabel->setSizePolicy(QSizePolicy::Ignored, QSizePolicy::Maximum);

pictureLabel = new QLabel(this);

summaryLabel = new QLabel(this);
summaryLabel->setOpenExternalLinks(true);
summaryLabel->setWordWrap(true);
QFont summaryFont = summaryLabel->font();
summaryFont.setPointSize(summaryFont.pointSize() + 2);
summaryLabel->setFont(summaryFont);
summaryLabel->setTextInteractionFlags(Qt::TextBrowserInteraction | Qt::TextSelectableByKeyboard | Qt::TextSelectableByMouse);
summaryLabel->setSizePolicy(QSizePolicy::Ignored, QSizePolicy::Maximum);

moreLinkLabel = new QLabel(this);
QFont moreLinkFont = moreLinkLabel->font();
moreLinkFont.setItalic(true);
moreLinkLabel->setFont(moreLinkFont);
moreLinkLabel->setOpenExternalLinks(true);

QVBoxLayout *layout = new QVBoxLayout(this);
layout->setContentsMargins(QMargins(15, 15, 15, 15));
layout->addWidget(artistLabel, 0, Qt::AlignTop);
layout->addSpacing(20);
layout->addWidget(pictureLabel, 0, Qt::AlignTop | Qt::AlignHCenter);
layout->addSpacing(20);
layout->addWidget(summaryLabel, 0, Qt::AlignTop);
layout->addSpacing(20);
layout->addWidget(moreLinkLabel, 0, Qt::AlignTop | Qt::AlignRight);
layout->addStretch(0);
scrollArea->setLayout(layout);
resetLabels();

QFrame *frame = new QFrame(this);
QVBoxLayout *mainLayout = new QVBoxLayout(this);
mainLayout->addWidget(scrollArea);
setLayout(mainLayout);

@

esdrasbeleza

I solved my problem making the widget inherit QScrollArea and replacing the code above for this:

@
ContextWidget::ContextWidget(QWidget *parent) :
QScrollArea(parent)
{
setStyleSheet("margin: 16px;"); // Makes scrollbar invisible!
setFrameStyle(QFrame::StyledPanel | QFrame::Raised);
setMidLineWidth(2);
setLineWidth(2);

// Set background and foreground colors
QWidget *widget = new QWidget(this);
QPalette contextPalette = widget->palette();
contextPalette.setColor(backgroundRole(), QColor(255,255, 255));
contextPalette.setColor(foregroundRole(), QColor(100,100,100));
widget->setPalette(contextPalette);
widget->setAutoFillBackground(true);

artistLabel = new QLabel(this);
artistLabel->setWordWrap(true);
QFont artistFont = artistLabel->font();
artistFont.setBold(true);
artistFont.setPointSize(artistFont.pointSize() + 4);
artistLabel->setFont(artistFont);
artistLabel->setSizePolicy(QSizePolicy::Ignored, QSizePolicy::Maximum);

pictureLabel = new QLabel(this);

summaryLabel = new QLabel(this);
summaryLabel->setOpenExternalLinks(true);
summaryLabel->setWordWrap(true);
QFont summaryFont = summaryLabel->font();
summaryFont.setPointSize(summaryFont.pointSize() + 2);
summaryLabel->setFont(summaryFont);
summaryLabel->setTextInteractionFlags(Qt::TextBrowserInteraction | Qt::TextSelectableByKeyboard | Qt::TextSelectableByMouse);
summaryLabel->setSizePolicy(QSizePolicy::Ignored, QSizePolicy::Maximum);

moreLinkLabel = new QLabel(this);
QFont moreLinkFont = moreLinkLabel->font();
moreLinkFont.setItalic(true);
moreLinkLabel->setFont(moreLinkFont);
moreLinkLabel->setOpenExternalLinks(true);

QVBoxLayout *layout = new QVBoxLayout(this);
layout->setContentsMargins(QMargins(15, 15, 15, 15));
layout->addWidget(artistLabel, 0, Qt::AlignTop);
layout->addSpacing(20);
layout->addWidget(pictureLabel, 0, Qt::AlignTop | Qt::AlignHCenter);
layout->addSpacing(20);
layout->addWidget(summaryLabel, 0, Qt::AlignTop);
layout->addSpacing(20);
layout->addWidget(moreLinkLabel, 0, Qt::AlignTop | Qt::AlignRight);
layout->addStretch(0);
widget->setLayout(layout);
setWidget(widget);
setWidgetResizable(true);
resetLabels();

}
@

But the line

@
setStyleSheet("margin: 16px;");
@

is making the scrollbars disappear! Is this some Qt bug or am I missing something?

? This user is from outside of this forum

try this instead:
@
setStyleSheet("QAbstractScrollArea { margin: 16px; }");
@