ui::DragResponse¶

Header: winui/ui/DragDrop.hpp.

A drop target's answer to a drag over it: what a drop there would do, and what the pointer shows meanwhile.

Returned by Element::drag_over() and the handler set with Element::on_drag_over(), which are asked when the drag comes over the element and at every move after. A refusal (operation None, the default) passes the question on to the next drop target up the tree. The first one that accepts gets the drop.

Example:

auto zone = std::make_unique<ui::BorderControl>();
zone->set_allow_drop(true);
zone->on_drag_over([](const ui::DragEventArgs& e)
{
    if (e.data.files.empty())
    {
        return ui::DragResponse{};
    }
    return ui::DragResponse{.operation = ui::DataPackageOperation::Copy, .caption = "Attach"};
});