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QGIM: simplify EmptyRowGenerator

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Make it constructible without a model so that we can default-construct
entries in flat ranges.

Change-Id: I51a97733a0de0b55d8cdbbca56ff528edd557ba6
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>
This commit is contained in:
Artem Dyomin 2025-04-02 17:03:59 +02:00 committed by Volker Hilsheimer
parent 5898d8da9a
commit 7718dcb53c
1 changed files with 10 additions and 12 deletions
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22
src/corelib/itemmodels/qgenericitemmodel.h
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@ -242,7 +242,7 @@ protected:
using iterator_category = std::input_iterator_tag;
using difference_type = int;
value_type operator*() { return impl.makeEmptyRow(parent); }
value_type operator*() { return impl->makeEmptyRow(*parent); }
EmptyRowGenerator &operator++() { ++n; return *this; }
friend bool operator==(const EmptyRowGenerator &lhs, const EmptyRowGenerator &rhs) noexcept
{ return lhs.n == rhs.n; }
@ -250,8 +250,8 @@ protected:
{ return !(lhs == rhs); }
difference_type n = 0;
Structure &impl;
const QModelIndex parent;
Structure *impl = nullptr;
const QModelIndex* parent = nullptr;
};
// If we have a move-only row_type and can add/remove rows, then the range
@ -799,20 +799,18 @@ public:
if (!children)
return false;
EmptyRowGenerator generator{0, &that(), &parent};
beginInsertRows(parent, row, row + count - 1);
const auto pos = QGenericItemModelDetails::pos(children, row);
if constexpr (range_features::has_insert_range) {
EmptyRowGenerator first{0, that(), parent};
EmptyRowGenerator last{count, that(), parent};
children->insert(pos, first, last);
} else if constexpr (rows_are_raw_pointers) {
auto start = children->insert(pos, count, nullptr);
auto end = std::next(start, count);
for (auto it = start; it != end; ++it)
*it = that().makeEmptyRow(parent);
children->insert(pos, generator, EmptyRowGenerator{count});
} else if constexpr (rows_are_owning_or_raw_pointers) {
auto start = children->insert(pos, count, row_type{});
std::copy(generator, EmptyRowGenerator{count}, start);
} else {
children->insert(pos, count, that().makeEmptyRow(parent));
children->insert(pos, count, *generator);
}
if constexpr (!rows_are_raw_pointers) {
// fix the parent in all children of the modified row, as the