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Help+LibManual: Make the children accessor fallible

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This is convenient for the section node which might compute children
on the fly.
This commit is contained in:
kleines Filmröllchen 2022-12-14 13:33:28 +01:00 • committed by Andrew Kaster
parent 437d3ca0ea
commit aa5e574872
5 changed files with 22 additions and 12 deletions
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20
Userland/Applications/Help/ManualModel.cpp
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@ -109,8 +109,11 @@ GUI::ModelIndex ManualModel::index(int row, int column, const GUI::ModelIndex& p
if (!parent_index.is_valid())
return create_index(row, column, Manual::sections[row].ptr());
auto* parent = static_cast<Manual::Node const*>(parent_index.internal_data());
auto* child = &parent->children()[row];
return create_index(row, column, child);
auto const children = parent->children();
if (children.is_error())
return {};
auto child = children.value()[row];
return create_index(row, column, child.ptr());
}
GUI::ModelIndex ManualModel::parent_index(const GUI::ModelIndex& index) const
@ -128,8 +131,12 @@ GUI::ModelIndex ManualModel::parent_index(const GUI::ModelIndex& index) const
return create_index(row, 0, parent);
VERIFY_NOT_REACHED();
}
for (size_t row = 0; row < parent->parent()->children().size(); row++) {
Manual::Node* child_at_row = &parent->parent()->children()[row];
auto maybe_children = parent->parent()->children();
if (maybe_children.is_error())
return {};
auto children = maybe_children.release_value();
for (size_t row = 0; row < children.size(); row++) {
Manual::Node* child_at_row = children[row];
if (child_at_row == parent)
return create_index(row, 0, parent);
}
@ -141,7 +148,10 @@ int ManualModel::row_count(const GUI::ModelIndex& index) const
if (!index.is_valid())
return static_cast<int>(Manual::sections.size());
auto* node = static_cast<Manual::Node const*>(index.internal_data());
return node->children().size();
auto maybe_children = node->children();
if (maybe_children.is_error())
return 0;
return static_cast<int>(maybe_children.value().size());
}
int ManualModel::column_count(const GUI::ModelIndex&) const