MAC ONLY- Vertical Scroll problem with QTableWidget

[user_mail07]

Hello Everyone.

In QTable Widget, i am adding some items in certain columns using “setCellWidget()”. Whereas, to add items in other columns of the same row I am using “setItem()”.
When I tried to use vertical scroll bar, the items added by using “setItem()” scroll properly. But the items added by “setCellWidget()” do not scroll at all . They are frozen.

I tried following options:-

[1] I tried setting the stylesheet –

QString scrollStyleSheet = “QTableWidget {}”

QString scrollStyleSheet = “QTableWidget {}”

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; // tried few variations too , but this works the best

ui->deviceGridTable->setStyleSheet(scrollStyleSheet )

ui->deviceGridTable->setStyleSheet(scrollStyleSheet )

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;

It works fine, so long as I do not scroll, when items are getting added. Before adding new items or after adding new items, if I scroll, it works fine. However, if I scroll, while new items are being added one by one , it shows the same old ugly characteristics which I just described.

[2] I tried setting “VerticalScrollMode” to “ScrollPerPixel”. It does not work at all.

What else can I try to fix the problem of vertical scrolling while items are detting added ? (Only for those items which are added using “setCellWidget()”. The problem is only on Mac OSX 10.8.1. I am using Qt 4.8.3

Thanks a lot.

[karankumar1609]

Same thread exists but no reply
http://www.qtcentre.org/threads/5387...tion-on-MacOsX

I have also seen a reply but unable to get my problem resolved...

Have a look if u got your problem solved then let me know.
http://stackoverflow.com/questions/1...erly-in-mac-os

[karankumar1609]

After a long compiling of Qt source .... and YAY
i got my problem resolved....
I applied this patch provided to me by Qt Commercial Support. This resolved my Mac scroll problems on Qt 4.8.5:

--- /Users/irfanomair/dev/qt-src-carbon-4.8.0/src/gui/kernel/qwidget_mac.mm 2011-12-15 10:38:21.000000000 -0800
    +++ kernel/qwidget_mac.mm 2012-09-18 17:17:03.000000000 -0700
    @@ -1,22 +1,41 @@
 
    @@ -4684,15 +4703,14 @@
    }
 
    // Scroll the whole widget if qscrollRect is not valid:
    - QRect validScrollRect = qscrollRect.isValid() ? qscrollRect : q->rect();
    - validScrollRect &= clipRect();
    + QRect validScrollRect = qscrollRect.isValid() ? qscrollRect : QRect(0, 0, q->width(), q->height());
 
    // If q is overlapped by other widgets, we cannot just blit pixels since
    // this will move overlapping widgets as well. In case we just update:
    const bool overlapped = isOverlapped(validScrollRect.translated(data.crect.topLeft()));
    const bool accelerateScroll = accelEnv && isOpaque && !overlapped;
    const bool isAlien = (q->internalWinId() == 0);
    - const QPoint scrollDelta(dx, dy);
    +
 
    // If qscrollRect is valid, we are _not_ supposed to scroll q's children (as documented).
    // But we do scroll children (and the whole of q) if qscrollRect is invalid. This case is
    @@ -4714,7 +4732,6 @@
    }else {
    update_sys(qscrollRect);
    }
    - return;
    }
 
    #ifdef QT_MAC_USE_COCOA
    @@ -4731,6 +4748,7 @@
    // moved when the parent is scrolled. All directly or indirectly moved
    // children will receive a move event before the function call returns.
    QWidgetList movedChildren;
    + const QPoint scrollDelta(dx, dy);
    if (scrollChildren) {
    QObjectList children = q->children();

--- /Users/irfanomair/dev/qt-src-carbon-4.8.0/src/gui/kernel/qwidget_mac.mm 2011-12-15 10:38:21.000000000 -0800
    +++ kernel/qwidget_mac.mm 2012-09-18 17:17:03.000000000 -0700
    @@ -1,22 +1,41 @@
     
    @@ -4684,15 +4703,14 @@
    }
     
    // Scroll the whole widget if qscrollRect is not valid:
    - QRect validScrollRect = qscrollRect.isValid() ? qscrollRect : q->rect();
    - validScrollRect &= clipRect();
    + QRect validScrollRect = qscrollRect.isValid() ? qscrollRect : QRect(0, 0, q->width(), q->height());
     
    // If q is overlapped by other widgets, we cannot just blit pixels since
    // this will move overlapping widgets as well. In case we just update:
    const bool overlapped = isOverlapped(validScrollRect.translated(data.crect.topLeft()));
    const bool accelerateScroll = accelEnv && isOpaque && !overlapped;
    const bool isAlien = (q->internalWinId() == 0);
    - const QPoint scrollDelta(dx, dy);
    +
     
    // If qscrollRect is valid, we are _not_ supposed to scroll q's children (as documented).
    // But we do scroll children (and the whole of q) if qscrollRect is invalid. This case is
    @@ -4714,7 +4732,6 @@
    }else {
    update_sys(qscrollRect);
    }
    - return;
    }
     
    #ifdef QT_MAC_USE_COCOA
    @@ -4731,6 +4748,7 @@
    // moved when the parent is scrolled. All directly or indirectly moved
    // children will receive a move event before the function call returns.
    QWidgetList movedChildren;
    + const QPoint scrollDelta(dx, dy);
    if (scrollChildren) {
    QObjectList children = q->children();

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