[Qt-interest] FW: Scrolling Contents in QScrollArea

[Sujan Dasmahapatra]

From: Sujan Dasmahapatra 
Sent: Wednesday, February 02, 2011 2:30 PM
To: 'Bo Thorsen'
Subject: RE: [Qt-interest] Scrolling Contents in QScrollArea

 

Dear Thorsen

See I have many widgets that's on the QScrollArea, those are already
added to the QScrollArea. How can we move all of them together as we
scroll.. That's what I am looking for. Please help me. Thanks sujan

 

 

Kind Regards,

 

 

Sujan Dasmahapatra
Project Leader, Aero Group
Aero Group

Tel    +91 80 66470248
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From: qt-interest-bounces+sdh=lmwindpower.com at qt.nokia.com
[mailto:qt-interest-bounces+sdh=lmwindpower.com at qt.nokia.com] On Behalf
Of Bo Thorsen
Sent: Wednesday, February 02, 2011 1:30 PM
To: qt-interest at qt.nokia.com
Subject: Re: [Qt-interest] Scrolling Contents in QScrollArea

 

Den 02-02-2011 08:01, Sujan Dasmahapatra skrev: 

Dear Friends

I am using a QScrollArea which I can see some contents  in it. By  using
the following  code snippet I am able to see both the vertical and
horizontal scrollbar. I am also implementing the virtual function 

 

////////////////////////////////////////////////////////////////////////
//////////////////////////////////

#include <QScrollArea>

 

Class PageForGraph : public QScrollArea

{

   Q_OBJECT

Public:

PageForGraph(QWidget  *parent=0);

                virtual ~PageForGraph();

};

 

PageForGraph::PageForGraph(QWidget *parent)

{

                verticalScrollBar()->setRange(0, 2 * desk->height());

                horizontalScrollBar()->setRange(0, 2 * desk->width());

 

}

void PageForGraph::scrollContentsBy(int dx, int dy)

{

                widget()->move(widget()->x() + dx, widget()->y() + dy);

                const int x = horizontalScrollBar()->value() + dx;

                horizontalScrollBar()->setValue( x );

                const int y = verticalScrollBar()->value() + dy;

                verticalScrollBar()->setValue( y );

                update();

}

But when I moving the scrollbar  my contents are not moving. Any help
would be highly appreciated. Thanks sujan


You are moving in the wrong direction here. Implement your graph widget
to show off the graph and add it to a QScrollArea. And remember to set
the size of the widget.

If you want to implement a widget that has it's own scrollbars, then
subclass QWidget, add two scrollbars yourself, and paint the widget
according to the scrollbar positions.

And please read the documentation for the class:
http://doc.qt.nokia.com/4.7/qscrollarea.html.



Bo Thorsen,
Fionia Software.
 
-- 
 
Expert Qt and C++ developer for hire
Contact me if you need expert Qt help
http://www.fioniasoftware.dk
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