PhoneListData GroupByParameter(GroupParameterName parameter)
{
Dictionary <string, PhoneList> result = new Dictionary <string, PhoneList>();
result.Add("All", phoneList);
foreach (Contact contact in phoneList)
{
string groupedValue = GetGroupedValue(contact, parameter);
if (!result.ContainsKey(groupedValue))
{
result.Add(groupedValue, new PhoneList());
}
result[groupedValue].Add(contact);
}
PhoneListData phoneListData = new PhoneListData(result.Count);
foreach (string group in result.Keys)
{
GroupedPhoneList groupedList = new GroupedPhoneList()
{
Contacts = result[group], GroupName = group
};
if (GetShowGroupIcon(parameter))
{
groupedList.ShowGroupIcon = true;
groupedList.GroupIconSource = GetGroupIconSource(group);
}
phoneListData.Add(groupedList);
}
return(phoneListData);
}
public PhoneListViewModel()
{
phoneList = XmlDataDeserializer.GetData <PhoneList>("Resources.PhoneListData.xml");
alphabeticalyPhoneListData = GroupByParameter(GroupParameterName.Alphabeticaly);
categoryPhoneListData = GroupByParameter(GroupParameterName.Category);
currentGroupParameter = GroupParameterName.Alphabeticaly;
}
async void OnItemClicked(object sender, EventArgs e)
{
var action = await DisplayActionSheet("Group by", "Cancel", null, GroupParameterName.Alphabeticaly.ToString(), GroupParameterName.Category.ToString());
if (action != null && action != "Cancel")
{
PhoneListViewModel model = BindingContext as PhoneListViewModel;
if (model != null && model.GroupParameter.ToString() != action)
{
GroupParameterName parameter = action == GroupParameterName.Alphabeticaly.ToString()? GroupParameterName.Alphabeticaly: GroupParameterName.Category;
model.SelectedItem = model.PhoneListData[0];
model.SetGroupByParameter(parameter);
if (model.GroupParameter == GroupParameterName.Alphabeticaly)
{
dxTabView.HeaderPanelPosition = Position.Right;
dxTabView.HeaderPanelContentAlignment = ContentAlignment.Start;
}
else
{
dxTabView.HeaderPanelPosition = Position.Bottom;
dxTabView.HeaderPanelContentAlignment = ContentAlignment.Center;
}
dxTabView.ItemsSource = model.PhoneListData;
dxTabView.SelectedItem = model.PhoneListData[0];
}
}
}
string GetGroupedValue(Contact contact, GroupParameterName parameter)
{
if (parameter == GroupParameterName.Alphabeticaly)
{
return(contact.LastName[0].ToString());
}
else
{
return(contact.ContactCategory.ToString());
}
}
public void SetGroupByParameter(GroupParameterName parameter)
{
ResetSelectedItem(null);
currentGroupParameter = parameter;
}
