private void PreviousPage_Click(object sender, RoutedEventArgs e)
{
int index = SelectedGroupList.IndexOf(SelectedItem);
if (index == 0)
{
var groupIndex = GroupList.IndexOf(SelectedGroupList);
if (groupIndex == 0)
{
return;
}
SelectedGroupList = GroupList[groupIndex - 1];
SelectedItem = SelectedGroupList.Last();
}
else
{
SelectedItem = SelectedGroupList[index - 1];
}
}
private void NextPage_Click(object sender, RoutedEventArgs e)
{
int index = SelectedGroupList.IndexOf(SelectedItem);
if (index == SelectedGroupList.Count - 1)
{
var groupIndex = GroupList.IndexOf(SelectedGroupList);
if (groupIndex == GroupList.Count - 1)
{
return;
}
SelectedGroupList = GroupList[groupIndex + 1];
SelectedItem = SelectedGroupList.First();
}
else
{
SelectedItem = SelectedGroupList[index + 1];
}
}