public MediaNode(string songName, double songPrice)
{
this.songName = songName;
this.songPrice = songPrice;
prev = null;
next = null;
}
public Object getNext(ListBox list)
{
MediaNode oldCurrent = current;
current = current.Prev;
list.Items.Add(oldCurrent.SongName);
return(list);
}
}//btnWithdraw
private void btnPurchase_Click(object sender, EventArgs e)
{
if (cacc != null && lstDisplaySongs.SelectedIndex != -1)
{
if (cacc.Balance >= ms.songs[lstDisplaySongs.SelectedIndex].SongPrice)
{
ms.purchaseSongs(cacc, lstDisplaySongs);
lblAccountDetails.Text = cacc.viewAccountDetails();
MediaNode node = new MediaNode(ms.songs[lstDisplaySongs.SelectedIndex].SongName, ms.songs[lstDisplaySongs.SelectedIndex].SongPrice);
ma = new MediaAccount(node);
ma.InsertAtFront(ma, node);
IIterator it = ma.createIterator();
while (it.hasMore())
{
it.getNext(lstPurchasedSongs);
}
}
else
{
MessageBox.Show("Please ensure that you have enough money in your current account before purchasing a song", "Error!");
}
}
else if (sacc != null && lstDisplaySongs.SelectedIndex != -1)
{
if (sacc.Balance >= ms.songs[lstDisplaySongs.SelectedIndex].SongPrice)
{
ms.purchaseSongs(sacc, lstDisplaySongs);
lblAccountDetails.Text = sacc.viewAccountDetails();
MediaNode node = new MediaNode(ms.songs[lstDisplaySongs.SelectedIndex].SongName, ms.songs[lstDisplaySongs.SelectedIndex].SongPrice);
ma = new MediaAccount(node);
ma.InsertAtFront(ma, node);
IIterator it = ma.createIterator();
while (it.hasMore())
{
it.getNext(lstPurchasedSongs);
}
}
else
{
MessageBox.Show("Please ensure that you have enough money in your savings account before purchasing a song", "Error!");
}
}
else
{
MessageBox.Show("Please ensure that you have selected a song from the list before trying to purchase", "Error!");
}
clearText();
}//btnPurchase
public void InsertAtFront(MediaAccount dList, MediaNode newData)
{
MediaNode newNode = new MediaNode(newData.SongName, newData.SongPrice);
newNode.Next = dList.head;
newNode.Prev = null;
if (dList.head != null)
{
dList.head.Prev = newNode;
size++;
}
dList.head = newNode;
}
public MediaAccount(MediaNode data)
{
this.data = data;
head = null;
size = 0;
}
public MediaIterator(MediaAccount collection)
{
this.collection = collection;
size = collection.Size;
current = collection.Head;
}
