carb::simplegui::kDragDropFlagAcceptBeforeDelivery

Defined in carb/simplegui/SimpleGuiTypes.h

const DragDropFlags carb::simplegui::kDragDropFlagAcceptBeforeDelivery = 1 << 10

AcceptDragDropPayload() will returns true even before the mouse button is released. You can then call IsDelivery() to test if the payload needs to be delivered.