Refactoring generic tree model behavior

scwx-qt/source/scwx/qt/model/tree_item.cpp

@@ -0,0 +1,98 @@
+#include <scwx/qt/model/tree_item.hpp>
+
+namespace scwx
+{
+namespace qt
+{
+namespace model
+{
+
+static const std::string logPrefix_ = "scwx::qt::model::tree_item";
+
+class TreeItem::Impl
+{
+public:
+   explicit Impl(const std::vector<QVariant>& data, TreeItem* parent) :
+       childItems_ {}, itemData_ {data}, parentItem_ {parent}
+   {
+   }
+   ~Impl() { qDeleteAll(childItems_); }
+
+   std::vector<TreeItem*> childItems_;
+   std::vector<QVariant>  itemData_;
+   TreeItem*              parentItem_;
+};
+
+TreeItem::TreeItem(const std::vector<QVariant>& data, TreeItem* parent) :
+    p {std::make_unique<Impl>(data, parent)}
+{
+}
+
+TreeItem::~TreeItem() {}
+
+TreeItem::TreeItem(TreeItem&&) noexcept            = default;
+TreeItem& TreeItem::operator=(TreeItem&&) noexcept = default;
+
+void TreeItem::AppendChild(TreeItem* item)
+{
+   item->p->parentItem_ = this;
+   p->childItems_.push_back(item);
+}
+
+const TreeItem* TreeItem::child(int row) const
+{
+   const TreeItem* item = nullptr;
+
+   if (0 <= row && row < p->childItems_.size())
+   {
+      item = p->childItems_[row];
+   }
+
+   return item;
+}
+
+int TreeItem::child_count() const
+{
+   return static_cast<int>(p->childItems_.size());
+}
+
+int TreeItem::column_count() const
+{
+   return static_cast<int>(p->itemData_.size());
+}
+
+QVariant TreeItem::data(int column) const
+{
+   if (0 <= column && column < p->itemData_.size())
+   {
+      return p->itemData_[column];
+   }
+   else
+   {
+      return QVariant();
+   }
+}
+
+int TreeItem::row() const
+{
+   int row = 0;
+
+   if (p->parentItem_ != nullptr)
+   {
+      const auto& childItems = p->parentItem_->p->childItems_;
+      row =
+         std::distance(childItems.cbegin(),
+                       std::find(childItems.cbegin(), childItems.cend(), this));
+   }
+
+   return row;
+}
+
+const TreeItem* TreeItem::parent_item() const
+{
+   return p->parentItem_;
+}
+
+} // namespace model
+} // namespace qt
+} // namespace scwx