@CuriousPan I have fixed the issue.
I used pretty dirty, but working trick: set Qt::AlignedCenter right in the delegate:
void CenteredCheckBoxDelegate::paint(QPainter *painter, const QStyleOptionViewItem &option, const QModelIndex &index) const
{
QStyleOptionViewItem opt = option;
const QWidget *widget = option.widget;
initStyleOption(&opt, index);
QStyle *style = opt.widget ? opt.widget->style() : QApplication::style();
style->drawPrimitive(QStyle::PE_PanelItemViewItem, &opt, painter, widget);
if (opt.features & QStyleOptionViewItem::HasCheckIndicator) {
switch (opt.checkState) {
case Qt::Unchecked:
opt.state |= QStyle::State_Off;
break;
case Qt::PartiallyChecked:
opt.state |= QStyle::State_NoChange;
break;
case Qt::Checked:
opt.state |= QStyle::State_On;
break;
}
auto rect = style->subElementRect(QStyle::SE_ItemViewItemCheckIndicator, &opt, widget);
opt.rect = QStyle::alignedRect(opt.direction, Qt::AlignCenter/*index.data(Qt::TextAlignmentRole).value<Qt::Alignment>()*/, rect.size(), opt.rect);
opt.state = opt.state & ~QStyle::State_HasFocus;
style->drawPrimitive(QStyle::PE_IndicatorItemViewItemCheck, &opt, painter, widget);
} else if (!opt.icon.isNull()) {
// draw the icon
QRect iconRect = style->subElementRect(QStyle::SE_ItemViewItemDecoration, &opt, widget);
iconRect = QStyle::alignedRect(opt.direction, Qt::AlignCenter/*index.data(Qt::TextAlignmentRole).value<Qt::Alignment>()*/, iconRect.size(), opt.rect);
QIcon::Mode mode = QIcon::Normal;
if (!(opt.state & QStyle::State_Enabled))
mode = QIcon::Disabled;
else if (opt.state & QStyle::State_Selected)
mode = QIcon::Selected;
QIcon::State state = opt.state & QStyle::State_Open ? QIcon::On : QIcon::Off;
opt.icon.paint(painter, iconRect, opt.decorationAlignment, mode, state);
} else {
QStyledItemDelegate::paint(painter, option, index);
}
}
bool CenteredCheckBoxDelegate::editorEvent(QEvent *event, QAbstractItemModel *model, const QStyleOptionViewItem &option, const QModelIndex &index)
{
Q_ASSERT(event);
Q_ASSERT(model);
// make sure that the item is checkable
Qt::ItemFlags flags = model->flags(index);
if (!(flags & Qt::ItemIsUserCheckable) || !(option.state & QStyle::State_Enabled) || !(flags & Qt::ItemIsEnabled))
return false;
// make sure that we have a check state
QVariant value = index.data(Qt::CheckStateRole);
if (!value.isValid())
return false;
const QWidget *widget = option.widget;
QStyle *style = option.widget ? widget->style() : QApplication::style();
// make sure that we have the right event type
if ((event->type() == QEvent::MouseButtonRelease) || (event->type() == QEvent::MouseButtonDblClick) || (event->type() == QEvent::MouseButtonPress)) {
QStyleOptionViewItem viewOpt(option);
initStyleOption(&viewOpt, index);
QRect checkRect = style->subElementRect(QStyle::SE_ItemViewItemCheckIndicator, &viewOpt, widget);
checkRect = QStyle::alignedRect(viewOpt.direction, Qt::AlignCenter/*index.data(Qt::TextAlignmentRole).value<Qt::Alignment>()*/, checkRect.size(), viewOpt.rect);
QMouseEvent *me = static_cast<QMouseEvent *>(event);
if (me->button() != Qt::LeftButton || !checkRect.contains(me->pos()))
return false;
if ((event->type() == QEvent::MouseButtonPress) || (event->type() == QEvent::MouseButtonDblClick))
return true;
} else if (event->type() == QEvent::KeyPress) {
if (static_cast<QKeyEvent *>(event)->key() != Qt::Key_Space && static_cast<QKeyEvent *>(event)->key() != Qt::Key_Select)
return false;
} else {
return false;
}
Qt::CheckState state = static_cast<Qt::CheckState>(value.toInt());
if (flags & Qt::ItemIsUserTristate)
state = ((Qt::CheckState)((state + 1) % 3));
else
state = (state == Qt::Checked) ? Qt::Unchecked : Qt::Checked;
return model->setData(index, state, Qt::CheckStateRole);
}
Thanks everyone who took part in the discussion.
