Nonemm/src/Nonemm.App/Dialogs/ChangeOperatorDialog.axaml.cs

using Avalonia.Controls;
using Avalonia.Interactivity;

namespace Nonemm.App.Dialogs;

/// Which callsign to write against the contacts picked in the log. It closes
/// with the callsign, or with null when nothing is to change. The operators
/// already known to the program are in the drop-down; any other callsign is
/// typed.
public sealed partial class ChangeOperatorDialog : Window
{
    public ChangeOperatorDialog(int contacts, string callsign, IReadOnlyList<string> known)
    {
        InitializeComponent();
        AboutText.Text = contacts == 1
            ? "Operator callsign for the contact picked in the log"
            : $"Operator callsign for the {contacts} contacts picked in the log";
        CallBox.Text = callsign;
        KnownBox.ItemsSource = known;
        // the callsign is all this dialog asks for, so the cursor starts in it
        // and the operator types over what is there
        Opened += (_, _) =>
        {
            CallBox.Focus();
            CallBox.SelectAll();
        };
    }

    private void OnPickedKnown(object? sender, SelectionChangedEventArgs e)
    {
        if (KnownBox.SelectedItem is string callsign)
        {
            CallBox.Text = callsign;
        }
    }

    /// An empty box leaves the dialog open: clearing the operator of a contact
    /// is not what this dialog is for.
    private void OnOk(object? sender, RoutedEventArgs e)
    {
        string callsign = (CallBox.Text ?? "").Trim().ToUpperInvariant();
        if (callsign.Length > 0)
        {
            Close(callsign);
        }
    }

    private void OnCancel(object? sender, RoutedEventArgs e) => Close(null);
}