Qt-interest Archive, May 2007
QScrollArea - how to access events?
Message 1 in thread
I've created a data-image display system that is based on QGLWidget
which pops up a stand-alone window containing the image. The size
of the pseudo-image (i.e. derived from the data) is determined after
the data is read in.
class DataDisplay : public QGLWidget
....
void DataDisplay::Setup(QString FileName)
{
GetData(FileName);
resize(nImageXdim,nImageYdim);
show();
}
which works very nicely. I have a number of event handlers that
deal with keyboard, mouse, move, resize and close events.
I need to deal with the situation where either 1) the image size is
greater than the screen size or 2) the image is zoomed to greater
than the screen size.
I tried embedding a QScrollArea in my code:
void DataDisplay::Setup(QString FileName)
{
GetData(FileName);
imageScroll = new QScrollArea();
imageScroll->setWidget(this);
imageScroll->setBackgroundRole(QPalette::Dark);
resize(nImageXdim,nImageYdim);
imageScroll->resize(nImageXdim+5,nImageYdim+5);
// this last seems to be necessary so that the image frame matches
// the size of the image and only adds a scroll bar when the image
// has exceeds the screen size - is there a better way to do this?
.........
and that works, up to a point - but, of course, now all events such as
keyboard, move, etc. are sent to the QScrollArea and not to my original
class - so how to access them? There seems to be a viewportEvent in
the base class, but I'm not sure how how to use this.
DS
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