private void UsernameHint_OnTap(object sender, GestureEventArgs e)
{
Caption.Focus();
var frameworkElement = e.OriginalSource as FrameworkElement;
if (frameworkElement != null)
{
var user = frameworkElement.DataContext as IUserName;
if (user != null)
{
var userBase = user as TLUserBase;
var index = 0;
for (var i = Caption.Text.Length - 1; i >= 0; i--)
{
if (Caption.Text[i] == '@')
{
index = i;
break;
}
}
if (TLString.IsNullOrEmpty(user.UserName))
{
if (userBase != null)
{
ViewModel.AddMention(userBase);
Caption.Text = string.Format("{0}({1})", Caption.Text.Substring(0, index + 1), userBase.FullName);
Caption.SelectionStart = Caption.Text.Length - userBase.FullName.Length - 1;
Caption.SelectionLength = userBase.FullName.Length;
}
}
else
{
Caption.Text = string.Format("{0}{1} ", Caption.Text.Substring(0, index + 1), user.UserName);
Caption.SelectionStart = Caption.Text.Length;
Caption.SelectionLength = 0;
}
}
}
}