MultiTerm/MultiTerm.Wpf/View/ConsoleView.xaml.cs

using MultiTerm.Core.ViewModel;
using System;
using System.Windows.Controls;
using System.Windows.Input;

namespace MultiTerm.Wpf.View;

public partial class ConsoleView : UserControl
{
    private ConsoleViewModel? viewModel;

    public ConsoleView()
    {
        InitializeComponent();
    }

    /// <summary>
    /// After user control finished loading, the data context is casted and stored locally.
    /// </summary>
    private void UserControl_Loaded(object sender, System.Windows.RoutedEventArgs e)
    {
        // cast to correct type
        if (this.DataContext is not ConsoleViewModel dataContextVm)
        {
            throw new InvalidOperationException($"{nameof(ConsoleView)} got wrong type of DataContext.");
        }
        // store locally
        viewModel = dataContextVm;
    }

    private void SendableMessageTextBox_PreviewKeyDown(object sender, KeyEventArgs e)
    {
        // send if the key was enter
        if (e.Key == Key.Enter)
        {
            // do not forward key => is handled
            e.Handled = true;
            this.viewModel!.Send();
        }
    }

    private void DataTextBox_TextChanged(object sender, TextChangedEventArgs e)
    {
        // scroll to end
        if (sender is not TextBox textBox) { return; }
        textBox.ScrollToEnd();
    }
}