inabox/InABox.DynamicGrid/FormDesigner/Controls/FormHeader.xaml.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;

namespace InABox.DynamicGrid
{
    /// <summary>
    /// Interaction logic for FormHeader.xaml
    /// </summary>
    public partial class FormHeader : UserControl
    {
        public delegate void CollapsedChangedEvent(FormHeader header, bool collapsed);

        public static readonly DependencyProperty HeaderTextProperty = DependencyProperty.Register("HeaderText", typeof(string), typeof(FormHeader));
        public static readonly DependencyProperty CollapsedProperty = DependencyProperty.Register(
            "Collapsed", typeof(bool), typeof(FormHeader),
            new FrameworkPropertyMetadata(true, FrameworkPropertyMetadataOptions.None, new PropertyChangedCallback(OnCollapsedChanged)));

        public string HeaderText
        {
            get => GetValue(HeaderTextProperty).ToString() ?? "";
            set => SetValue(HeaderTextProperty, value);
        }

        public bool Collapsed
        {
            get => (bool)GetValue(CollapsedProperty);
            set => SetValue(CollapsedProperty, value);
        }

        public event CollapsedChangedEvent? CollapsedChanged;

        public FormHeader()
        {
            InitializeComponent();
        }

        private static void OnCollapsedChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
        {
            var header = (FormHeader)d;
            var collapsed = (bool)e.NewValue;
            header.CollapsedChanged?.Invoke(header, collapsed);
        }

        private void Button_Click(object sender, RoutedEventArgs e)
        {
            Collapsed = !Collapsed;
        }
    }
}