Method dropEvent

lib/macro/macro-tree.cpp:996–1230

Logic mostly based on OBS's source-tree dropEvent() with a few modifications regarding group handling

// Logic mostly based on OBS's source-tree dropEvent() with a few modifications
// regarding group handling
void MacroTree::dropEvent(QDropEvent *event)
{
	if (event->source() != this) {
		QListView::dropEvent(event);
		return;
	}

	MacroTreeModel *mtm = GetModel();
	auto &items = mtm->_macros;
	QModelIndexList indices = selectedIndexes();

	DropIndicatorPosition indicator = dropIndicatorPosition();
	int row = indexAt(event->position().toPoint()).row();
	bool emptyDrop = row == -1;

	if (emptyDrop) {
		if (items.empty()) {
			QListView::dropEvent(event);
			return;
		}

		row = mtm->rowCount(QModelIndex()) - 1;
		indicator = QAbstractItemView::BelowItem;
	}

	// Store destination group if moving to a group
	Macro *dropItem = items[ModelIndexToMacroIndex(row, items)]
				  .get(); // Item being dropped on
	bool itemIsGroup = dropItem->IsGroup();
	Macro *dropGroup = itemIsGroup ? dropItem : dropItem->Parent().get();

	// Not a group if moving above the group
	if (indicator == QAbstractItemView::AboveItem && itemIsGroup) {
		dropGroup = nullptr;
	}
	if (emptyDrop) {
		dropGroup = nullptr;
	}

	// Remember to remove list items if dropping on collapsed group
	bool dropOnCollapsed = false;
	if (dropGroup) {
		dropOnCollapsed = dropGroup->IsCollapsed();
	}

	if (indicator == QAbstractItemView::BelowItem ||
	    indicator == QAbstractItemView::OnItem ||
	    indicator == QAbstractItemView::OnViewport)
		row++;

	if (row < 0 || row > (int)items.size()) {
		QListView::dropEvent(event);
		return;
	}

	// Determine if any base group is selected
	bool hasGroups = false;
	for (int i = 0; i < indices.size(); i++) {