//method to display sorted track list in listbox
private void DisplayTracks()
{
lbTracks.Items.Clear();
Node <string> temp = sortedTrackList.getHead();
while (temp != null)
{
lbTracks.Items.Add(temp.getName());
temp = temp.next;
}
}
//method to add user selected files (of certain audio formats) to listbox
//and to the linked list, while also sorting them with a merge sort
private void BtnAddTracks_Click(object sender, EventArgs e)
{
//use open file dialog
using (OpenFileDialog fileDialog = new OpenFileDialog()
{
Multiselect = true,
//InitialDirectory = ".\",
//accepted files types
Filter = "WMA|*.wma|WMV|*.wmv|WAV|*wav|MP3|*.mp3|MP4|*.mp4|MKV|*.mkv"
})
{
//if the user presses 'ok'
if (fileDialog.ShowDialog() == DialogResult.OK)
{
//set the sorted track list to the unsorted - used if user add files multiple times
//this serves to correct the node values of 'next' and 'prev' in the unsorted list
trackList = sortedTrackList;
//loop through the selected files and add as nodes to linked list
foreach (string fileName in fileDialog.FileNames)
{
//put this info into a file object
FileInfo file = new FileInfo(fileName);
//obtain path and name information as strings
string name = Path.GetFileNameWithoutExtension(file.FullName);
string path = file.FullName;
//if list isn't empty, check for dupes
if (trackList.GetLengthOfList() > 0)
{
Node <string> checkDupe = trackList.CheckForDuplicate(name);
if (checkDupe == null) //not not null, isnt added
{
//call add method
trackList.AddLastNode(name, path);
}
}
else
{
trackList.AddLastNode(name, path);
}
}
//null a new head object (useful if user adds files multiple times)
Node <string> newHead = null;
//set the new head object to the first place of the sorted list
newHead = trackList.MergeSort(trackList.getHead());
//clear the sorted list (in case of user adding songs multiple times)
sortedTrackList = new TrackLinkedList <string>();
//use a temp node object to traverse the sorted head nodes and store them in the sorted linked list
Node <string> temp = newHead;
while (temp != null)
{
sortedTrackList.AddLastNode(temp.getName(), temp.getPath());
temp = temp.next;
}
//display sorted tracks in listBox
DisplayTracks();
//set current song to first in list
currentTrack = newHead;
}
}
toolStripStatusLabel.Text = "Success! Tracks have been added";
}