Method tryPlaceItem

game/ui/general/aequipscreen.cpp:1327–1424

}

bool AEquipScreen::tryPlaceItem(sp<Agent> agent, Vec2<int> slotPos, bool *insufficientTU,
                                bool *alienArtifact)
{
	bool canAdd = agent->canAddEquipment(slotPos, draggedEquipment->type);
	sp<AEquipment> equipmentUnderCursor = nullptr;
	// If can't add maybe we can insert a clip?
	if (!canAdd)
	{
		equipmentUnderCursor =
		    std::dynamic_pointer_cast<AEquipment>(agent->getEquipmentAt(slotPos));
		if (equipmentUnderCursor &&
		    equipmentUnderCursor->type->type == AEquipmentType::Type::Weapon &&
		    std::find(equipmentUnderCursor->type->ammo_types.begin(),
		              equipmentUnderCursor->type->ammo_types.end(),
		              draggedEquipment->type) != equipmentUnderCursor->type->ammo_types.end())
		{
			if (equipmentUnderCursor->canBeUsed(*state))
			{
				canAdd = true;
			}
			else
			{
				if (alienArtifact)
				{
					*alienArtifact = true;
				}
			}
		}
	}

	if (!canAdd)
	{
		// Try adjacent positions
		// FIXME: Vec2<int> constexpr?
		static const std::array<Vec2<int>, 8> adjacent_offsets = {
		    Vec2<int>{1, 0}, Vec2<int>{-1, 0}, Vec2<int>{0, 1},  Vec2<int>{0, -1},
		    Vec2<int>{1, 1}, Vec2<int>{1, -1}, Vec2<int>{-1, 1}, Vec2<int>{-1, -1}};
		for (const auto offset : adjacent_offsets)
		{
			const auto offsetPosition = slotPos + offset;
			if (offsetPosition.x < 0 || offsetPosition.y < 0)
				continue;
			const bool canAddOffset =
			    agent->canAddEquipment(offsetPosition, draggedEquipment->type);
			if (canAddOffset)
			{
				canAdd = true;
				slotPos = offsetPosition;
				break;
			}
		}
	}

	if (canAdd && agent->unit && agent->unit->tileObject &&
	    state->current_battle->mode == Battle::Mode::TurnBased && draggedEquipmentOrigin.x == -1 &&
	    draggedEquipmentOrigin.y == -1 &&
	    !agent->unit->spendTU(*state, agent->unit->getPickupCost()))
	{