[Solved] QScrollarea doesnt work

chaf84

Hi
I have a qdeclarative view that I want to put in a QScrollArea the problem is that the scrollarea dosent work. It doesnt matter how big I set the declarative view. I dont get the scrollbar it is like it cant tell that the view need a scrollbar. If i dont set setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOn); the scrollbar doesnt appear.

Parent are inserted in a borderlayout as the centralwidget - I use this layout http://qt-project.org/doc/qt-4.8/layouts-borderlayout.html
@
myWidgets *editWidget = new myWidgets(pathToExe,viewerMgr, this);
editWidget->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
@

Here is myWidget I have tried differentsizes but I cant get it to work
@QScrollArea* scroll = new QScrollArea();
view = new QDeclarativeView(this);
view->setSource(QUrl::fromLocalFile(path));
view->setSizePolicy(QSizePolicy::Ignored, QSizePolicy::Ignored);

view->setResizeMode(QDeclarativeView::SizeViewToRootObject);
scroll->setWidget(view);
scroll->setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOn);
scroll->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOn);
scroll->setWidgetResizable(true);
scroll->setMaximumHeight(800);
scroll->setMaximumWidth(1000);@

chaf84

I have found what the problem is, the scrollarea or the content dont have any restriction how big they can be.
If i replace
@
view->setSizePolicy(QSizePolicy::Ignored, QSizePolicy::Ignored);
@
to
@
view->setSizePolicy(QSizePolicy::Fixed, QSizePolicy::Fixed);
@
The scrollarea work, but the problem is that I cant use my zoom function with this solution.
Are there a way to get maximumsize from the layout? I need the widget to fill centralwidget.

chaf84

I got the zoom function to work but the scrollarea dont update. It has the original scroll are so if I zoom with a scale of 2 I can only scroll half the area. I have tried to change range of the qscrollbars but they dont update.
My new code

Scrollarea
@
QVBoxLayout *layout = new QVBoxLayout;
scroll = new QScrollArea(this);

testWidget = new testWidgets(path,cMgr,this);
testWidget->setSizePolicy(QSizePolicy::Fixed, QSizePolicy::Fixed);

scroll->setWidget(testWidget);
scroll->setWidgetResizable(true);

layout->addWidget(scroll);
setLayout(layout);

@
Zoom funtion in testWidget
@
void testWidgets::zoom(double scale){
double tmp = scale/previousScale;
view->scale(tmp,tmp);
previousScale = scale;
view->updateGeometry();
}
@

sizeHint in test widget

@
QSize testWidgets::sizeHint() const
{
return QSize(view->sizeHint()*previousScale);
}
@

chaf84

I have solved this problem, I created a help class that holds the qscrollarea and the fix is to update qscrollarea viewport.
here is the code for the helpwidget
@
testHelpWidget::testHelpWidget(QString path,viewerManager *cMgr, QWidget *parent)
: QWidget(parent)
{
QVBoxLayout *layout = new QVBoxLayout;
scroll = new QScrollArea(this);

testWidget = new testWidgets(path,cMgr,this);
testWidget->setSizePolicy(QSizePolicy::Fixed, QSizePolicy::Fixed);
QObject::connect(testWidget,SIGNAL(zoomChanged()),this,SLOT(repaintZoom()));
scroll->setWidget(qmlWidget);
scroll->setWidgetResizable(true);
scroll->setAlignment(Qt::AlignLeft);
layout->addWidget(scroll);
setLayout(layout);
//show();

}

void testHelpWidget::repaintZoom(){
scroll->viewport()->updateGeometry();
scroll->viewport()->update();
scroll->update();
}
@
Code for zoom function in testWidget
@
void testWidgets::zoom(double scale){
double tmp = scale/1;
double reset = 1/previousScale;
if(scale == previousScale){
return;
}

view->scale(reset,reset);
view->resize(view->sizeHint()*reset);

view->scale(tmp,tmp);
previousScale = scale;

view->resize(view->sizeHint()*tmp);
view->updateGeometry();
view->update();
emit zoomChanged();

}
@