Qt4-preview-feedback Archive, June 2007
Behavior changed for QGV scrollbars
Message 1 in thread
Hello,
I was used (with Qt4.2 and before) to have a QGV with hidden scrollbars
(ScrollBarAlwaysOff) but that was scrolled with
frame-> verticalScrollBar()->setValue ( yyy )
when the mouse is near one of the window borders.
Since Qt4.3, this behavior has changed. Now, minimum and maximum values for
the scrollbars are both 0 and thus asking for a change has no effect.
I think that this is a bug, but maybe should I use another method to do this
scrolling ?
Note that if I enable the scroll bars (ScrollBarAlwaysOn) and hide them with
hide(), then it works but there is as expected an ugly gray zone at the bars
positions.
Best regards,
Kleag
--
[ signature omitted ]
Message 2 in thread
Kleag a Ãcrit :
> Hello,
>
> I was used (with Qt4.2 and before) to have a QGV with hidden scrollbars
> (ScrollBarAlwaysOff) but that was scrolled with
> frame-> verticalScrollBar()->setValue ( yyy )
> when the mouse is near one of the window borders.
> Since Qt4.3, this behavior has changed. Now, minimum and maximum values for
> the scrollbars are both 0 and thus asking for a change has no effect.
>
> I think that this is a bug, but maybe should I use another method to do this
> scrolling ?
>
> Note that if I enable the scroll bars (ScrollBarAlwaysOn) and hide them with
> hide(), then it works but there is as expected an ugly gray zone at the bars
> positions.
>
> Best regards,
>
> Kleag
Hi,
This has already been reported and fixed. Take a look at task 163919.
I attached the patch I get from Trolls.
--- src/gui/graphicsview/qgraphicsview.cpp 2007-06-08 15:04:47 -0000
--- src/gui/graphicsview/qgraphicsview.cpp 2007-06-08 15:04:47 -0000
+++ src/gui/graphicsview/qgraphicsview.cpp 2007-06-08 15:04:47 -0000
@@ -410,7 +410,9 @@
// If the whole scene fits horizontally, we center the scene horizontally,
// and ignore the horizontal scroll bars.
- if (!useHorizontalScrollBar) {
+ int left = int(qMax<qreal>(viewRect.left(), INT_MIN));
+ int right = int(qMin<qreal>(viewRect.right() - width, INT_MAX));
+ if (left >= right) {
q->horizontalScrollBar()->setRange(0, 0);
switch (alignment & Qt::AlignHorizontal_Mask) {
@@ -426,17 +428,17 @@
break;
}
} else {
- int left = int(qMax<qreal>(viewRect.left(), INT_MIN));
- int right = int(qMin<qreal>(viewRect.right() - width + 1, INT_MAX));
q->horizontalScrollBar()->setRange(left, right);
q->horizontalScrollBar()->setPageStep(width);
q->horizontalScrollBar()->setSingleStep(width / 20);
leftIndent = 0;
}
- // If the whole scene fits vertical, we center the scene vertically, and
+ // If the whole scene fits vertically, we center the scene vertically, and
// ignore the vertical scroll bars.
- if (!useVerticalScrollBar) {
+ int top = int(qMax<qreal>(viewRect.top(), INT_MIN));
+ int bottom = int(qMin<qreal>(viewRect.bottom() - height, INT_MAX));
+ if (top >= bottom) {
q->verticalScrollBar()->setRange(0, 0);
switch (alignment & Qt::AlignVertical_Mask) {
@@ -452,8 +454,6 @@
break;
}
} else {
- int top = int(qMax<qreal>(viewRect.top(), INT_MIN));
- int bottom = int(qMin<qreal>(viewRect.bottom() - height + 1, INT_MAX));
q->verticalScrollBar()->setRange(top, bottom);
q->verticalScrollBar()->setPageStep(height);
q->verticalScrollBar()->setSingleStep(height / 20);
Message 3 in thread
Hello,
Thanks. Your patch works for me too. Sorry for the noise.
Best reagards,
Kleag
Le lundi 11 juin 2007, alexandre.raczynski@technog a ÃcritÂ:
> Kleag a Ãcrit :
> > Hello,
> >
> > I was used (with Qt4.2 and before) to have a QGV with hidden scrollbars
> > (ScrollBarAlwaysOff) but that was scrolled with
> > frame-> verticalScrollBar()->setValue ( yyy )
> > when the mouse is near one of the window borders.
> > Since Qt4.3, this behavior has changed. Now, minimum and maximum values
> > for the scrollbars are both 0 and thus asking for a change has no effect.
> >
> > I think that this is a bug, but maybe should I use another method to do
> > this scrolling ?
> >
> > Note that if I enable the scroll bars (ScrollBarAlwaysOn) and hide them
> > with hide(), then it works but there is as expected an ugly gray zone at
> > the bars positions.
> >
> > Best regards,
> >
> > Kleag
>
> Hi,
>
> This has already been reported and fixed. Take a look at task 163919.
> I attached the patch I get from Trolls.
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[ signature omitted ]
