public bool ReorderTracks(List <int> trackIdx, int insertIdx)
{
int firstIdx = trackIdx[0];
int newInsertIdx = insertIdx;
// correct insertIdx by checking how many items locating before it
for (int i = 0; i < trackIdx.Count; i++)
{
if (trackIdx[i] < insertIdx)
{
newInsertIdx--;
}
}
if (newInsertIdx == firstIdx)
{
return(false); // no need to reorder tracks
}
else
{
trackIdx.Sort((x, y) => - x.CompareTo(y)); // descending sorting
List <TrackInfo> tracks = new List <TrackInfo>(trackIdx.Count);
for (int i = 0; i < trackIdx.Count; i++)
{
tracks.Add(Soundtracks[trackIdx[i]]);
Soundtracks.RemoveAt(trackIdx[i]);
}
this.InsertTracks(tracks, newInsertIdx);
}
return(true);
}
public void InsertTracks(List <TrackInfo> tracks, int insertIdx)
{
foreach (TrackInfo track in tracks)
{
Soundtracks.Insert(insertIdx, track);
}
}
public void DeleteTracksByIndices(int[] indices)
{
Array.Sort <int>(indices, (x, y) => { return(-x.CompareTo(y)); });
foreach (int i in indices)
{
Soundtracks.RemoveAt(i);
}
}
public void UpdateSoundtracks(Playlist pl)
{
Soundtracks.FillContent(pl.Soundtracks);
}
public void UpdateSoundtracks(List <TrackInfo> source)
{
Soundtracks.FillContent(source);
}
void IDropTarget.Drop(IDropInfo dropInfo)
{
DataObject dataObject = dropInfo.Data as DataObject;
if (dataObject != null && dataObject.ContainsFileDropList())
{
IEnumerable <string> dropList = dataObject.GetFileDropList().Cast <string>();
List <TrackInfo> tlist = new List <TrackInfo>();
foreach (string filePath in dropList)
{
if (!MPLiteConstant.validFileType.Contains(Path.GetExtension(filePath)))
{
continue;
}
try
{
TrackInfo track = TrackInfo.ParseSource(filePath);
tlist.Add(track);
Soundtracks.Add(track);
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
}
if (tlist.Count != 0)
{
Playlist pl = PlaylistCollection.UpdatePlaylist(tlist, TracklistName);
UpdatePlaylistEventArgs e = new UpdatePlaylistEventArgs(pl, PlayingTrack);
PlaylistIsUpdatedEvent?.Invoke(e);
}
}
else
{
// workaround: There is a bug that user can drag item from the gap between two items.
// It triggers DragEvent without SelectionChangeEvent. So that `selectedIndices` will be empty.
if (selectedIndices.Count == 0)
{
return;
}
// Reorder tracks
List <TrackInfo> tracks;
if ((dropInfo.Data as List <TrackInfo>) == null)
{
// Single file is dropped
tracks = new List <TrackInfo>();
tracks.Add(dropInfo.Data as TrackInfo);
}
else
{
// Multiple files is dropped
tracks = dropInfo.Data as List <TrackInfo>;
}
Playlist pl = PlaylistCollection.ReorderTracks(TracklistGUID, SelectedIndices, dropInfo.InsertIndex);
if (pl == null)
{
return;
}
UpdateSoundtracks(pl.Soundtracks);
UpdatePlaylistEventArgs e = new UpdatePlaylistEventArgs(pl, PlayingTrack);
PlaylistIsUpdatedEvent?.Invoke(e);
// reset PlayStatus
if (PlayingTrack != null)
{
TrackInfo track = soundtracks.FirstOrDefault(x => x.GUID == PlayingTrack.GUID);
if (track != null)
{
track.TrackStatus = PlayingTrack.TrackStatus;
}
}
}
}
