GridLayout and ScrollArea

fouffa89

I have a scrollArea wich contains a list of widgets (progressbar, label,tool button)
@
gridl->addWidget(w);
ui->scroll->setLayout(gridl);
@
gridl is a gridLayout.

Is it possible to update widgets position on click event?
for exemple: switching between lines (line3<--line2, line2<--line3)
I'm obliged to call @ui->scroll->setLayout(gridl);@ when I make some changes on the GridLayout
I'm lost please help me.

bodzio131

[quote author="fouffa89" date="1365158146"]
Is it possible to update widgets position on click event?
[/quote]

What about QScrollArea mouse events methods?

fouffa89

I have no idea how to do it but I will search for some example , thanks a lot , your post was helpful.

b1gsnak3

another solution would be to have a method in which you create a new gridLayout, add the existing items to that layout, call scrollArea->layout()->deleteLater(); and after call scrollArea->setLayout(new gridLayout);

fouffa89

yes this is my solution for now but I'm searching for the best solution to do it. The problem is how to make some changes without loading all the gridlayout?

bodzio131

I don't understand why you need to load whole layout. I tried myself and every change in layout is visible automatically (Qt5.0.2, VS2012). See below at my simple test, it changes layout after 5 seconds in timer event (moves label '3' from position 4 to 1). Please, forgive slummy example, I used box layout instead of grid for simplicity.

@
#include <QtWidgets\qapplication.h>
#include <QtWidgets\qwidget.h>
#include <QtWidgets\qscrollarea.h>
#include <QtWidgets\qlabel.h>
#include <QtWidgets\qboxlayout.h>
#include <QtCore\qstring.h>

class MyScrollArea
: public QScrollArea
{
public:
MyScrollArea()
{
//prepare layout elements
m_mainLayout = new QVBoxLayout;

for ( int i = 0; i < 10; ++i )
{
QLabel * label( new QLabel( QString::number( i ) ) );
m_mainLayout->addWidget( label );
m_labels.push_back( label );
}

//set layout container
QWidget *widget( new QWidget );
widget->setLayout( m_mainLayout );
setWidget( widget );

//start timer
startTimer( 5000 );
}

void timerEvent( QTimerEvent * )
{
//change layout
m_mainLayout->removeWidget( m_labels[ 3 ] );
m_mainLayout->insertWidget( 0, m_labels[ 3 ] );
}

QVBoxLayout m_mainLayout;
QVector< QLabel > m_labels;

};

int main( int _argc, char** _argv )
{
QApplication app( _argc, _argv );

MyScrollArea scrollArea;
scrollArea.setMaximumHeight( 100 );
scrollArea.show();

return app.exec();
}
@

fouffa89

You're right , I never thought that it was as simple as that ,Thanks a lot!