protected override void OnCreate(Bundle savedInstanceState)
{
base.OnCreate(savedInstanceState);
SetContentView(Resource.Layout.tip_calculator);
Toolbar = FindViewById <Toolbar>(Resource.Id.toolbar);
if (Toolbar != null)
{
SetSupportActionBar(Toolbar);
SupportActionBar.SetDisplayHomeAsUpEnabled(true);
SupportActionBar.SetHomeButtonEnabled(false);
}
Calculate = FindViewById <Button>(Resource.Id.calculate);
BillAmount = FindViewById <EditText>(Resource.Id.bill_amount);
TipAmount = FindViewById <TextView>(Resource.Id.tip_amount);
Calculate.Click += (s, e) =>
{
var amount = Convert.ToDecimal(BillAmount.Text);
TipAmount.Text = _tipCalculator.Calculate(amount).ToString("C2");
};
Calculate.Enabled = false;
BillAmount.TextChanged += (s, e) => Calculate.Enabled = !string.IsNullOrEmpty(BillAmount.Text);
}
public override void ViewDidLoad()
{
base.ViewDidLoad();
Title = "TipCalc";
Calculate.TouchUpInside += (s, e) =>
{
var amount = Convert.ToDecimal(BillAmount.Text);
TipAmount.Text = _tipCalculator.Calculate(amount).ToString("C2");
};
Calculate.Enabled = false;
BillAmount.AddTarget((s, e) => Calculate.Enabled = !string.IsNullOrEmpty(BillAmount.Text),
UIControlEvent.EditingChanged);
}
private void Calculate() => TipAmount = _tipCalculator.Calculate(BillAmount);