diff options
Diffstat (limited to 'lib/dtas/tracklist.rb')
-rw-r--r-- | lib/dtas/tracklist.rb | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/lib/dtas/tracklist.rb b/lib/dtas/tracklist.rb index b9abe55..7366799 100644 --- a/lib/dtas/tracklist.rb +++ b/lib/dtas/tracklist.rb @@ -220,4 +220,25 @@ class DTAS::Tracklist # :nodoc: end @goto_pos = prev_idx end + + def swap(a_id, b_id) + ok = { a_id => a_idx = [], b_id => b_idx = [] } + @list.each_with_index do |t,i| + ary = ok.delete(t.track_id) or next + ary[0] = i + break if ok.empty? + end + a_idx = a_idx[0] or return + b_idx = b_idx[0] or return + @list[a_idx], @list[b_idx] = @list[b_idx], @list[a_idx] + unless @shuffle + [ :@goto_pos, :@pos ].each do |v| + case instance_variable_get(v) + when a_idx then instance_variable_set(v, b_idx) + when b_idx then instance_variable_set(v, a_idx) + end + end + end + true + end end |