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queue/Queue: add methods MoveOrderBefore() and MoveOrderAfter()

This commit is contained in:
Max Kellermann 2017-10-18 08:50:01 +02:00
parent 81b7373637
commit f2fac77d8c
2 changed files with 36 additions and 0 deletions
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18
src/queue/Queue.cxx
View File

@ -215,6 +215,24 @@ Queue::MoveOrder(unsigned from_order, unsigned to_order) noexcept
return to_order;
}
unsigned
Queue::MoveOrderBefore(unsigned from_order, unsigned to_order) noexcept
{
/* if "from_order" comes before "to_order", then the new
position is "to_order-1"; otherwise the "to_order" song is
moved one ahead */
return MoveOrder(from_order, to_order - (from_order < to_order));
}
unsigned
Queue::MoveOrderAfter(unsigned from_order, unsigned to_order) noexcept
{
/* if "from_order" comes after "to_order", then the new
position is "to_order+1"; otherwise the "to_order" song is
moved one back */
return MoveOrder(from_order, to_order + (from_order > to_order));
}
void
Queue::DeletePosition(unsigned position) noexcept
{

18
src/queue/Queue.hxx
View File

@ -289,6 +289,24 @@ struct Queue {
*/
unsigned MoveOrder(unsigned from_order, unsigned to_order) noexcept;
/**
* Moves a song to a new position in the "order" list before
* the given one.
*
* @return the new order number of the given "from" song
*/
unsigned MoveOrderBefore(unsigned from_order,
unsigned to_order) noexcept;
/**
* Moves a song to a new position in the "order" list after
* the given one.
*
* @return the new order number of the given "from" song
*/
unsigned MoveOrderAfter(unsigned from_order,
unsigned to_order) noexcept;
/**
* Moves a song to a new position.
*/