Hi,
I'm not sure that this will help, but...
Can you reset model on closing of your table view, drop any data, etc...
And then close view.
If I understood your correctly you are loading model again on new show?
On 18.01.2016 11:40, Mojmír Svoboda wrote:
Hello,
i have a crash in QCommonStyle::subElementRect
case SE_ItemViewItemDecoration:
case SE_ItemViewItemText:
case SE_ItemViewItemFocusRect:
if (const QStyleOptionViewItem *vopt = ...) {
if (!d->isViewItemCached(*vopt)) {
d->viewItemLayout(...);
if (d->cachedOption) {
>>>> delete d->cachedOption;
d->cachedOption = 0;
}
d->cachedOption = new QStyleOptionViewItem(*vopt);
}
with callstack:
QArrayData::deallocate
QTypedArrayData<unsigned short>::deallocate(QArrayData * data)
QString::~QString() Line 1070
QStyleOptionViewItem::~QStyleOptionViewItem()
QStyleOptionViewItem::`scalar deleting destructor'(unsigned int)
> QCommonStyle::subElementRect(QStyle::SubElement sr, const
QStyleOption * opt, const QWidget * widget) Line 2993
QWindowsStyle::subElementRect
QWindowsVistaStyle::subElementRect
QCommonStyle::drawControl
QWindowsStyle::drawControl
QWindowsVistaStyle::drawControl
QStyledItemDelegate::paint
QTableViewPrivate::drawCell
QTableView::paintEvent
...
How this occurs:
i have QTableView with custom model that uses memmapped file filled
with lots of QStringData. These QStringData are set using the
technique presented in http://woboq.com/blog/qstringliteral.html for
example.
The problem is when the storage goes away (widget is closed), because
there may be copies of those strings, and indeed they are.
One of the copies is in QCommonStylePrivate::cachedOption::text field. I
suspect these style classes use some form of sharing, so when i close
the widget, the copy of qstring will survive the storage, and then
when new qtableview opens, it tries to reuse the style and on the
first use it destroys the old content of .text field and crash follows.
Now what do i do? Try to force somehow the style class to drop the
d->cachedOption?
Any ideas, please?
Best regards,
Mojmir
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