linear-app-launcher/Windows/Forms/Tile/TileGroupLabel.cs

using System;
using System.ComponentModel;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace AppLauncher.Windows.Forms
{
    public partial class TileGroupLabel : AUserControl
    {
        protected bool isChecked = false;

        public TileGroupLabel() : base()
        {
            InitializeComponent();

            this.Checked = false;

        }

        [Category("Appearance"), Browsable(true)]
        public string TitleText { get => label1.Text; set => label1.Text = value; }

        [Category("Appearance"), Browsable(true)]
        public bool Checked
        {
            get => isChecked;
            set
            {
                isChecked = value;

                pictureBox1.BackgroundImage = (value) ? Properties.Resources.toggle_right_ea_16 : Properties.Resources.toggle_left_ea_16;
            }
        }

        [Browsable(false), EditorBrowsable(EditorBrowsableState.Never)]
        public TileContainer TileGroupPanel { get; set; } = null;

        protected async override void OnLoad(EventArgs e)
        {
            base.OnLoad(e);

            await invalidateToggle(false);
        }

        protected async void panel_MouseClick(object sender, MouseEventArgs e)
        {
            if (e.Button != MouseButtons.Left)
            {
                return;
            }

            this.Checked = !this.Checked;

            await invalidateToggle();
        }

        protected async Task invalidateToggle(bool animate = true)
        {
            if (this.TileGroupPanel == null)
            {
                return;
            }

            if (this.Checked)
            {
                await this.TileGroupPanel.Expand();
            }
            else
            {
                if (animate)
                {
                    await this.TileGroupPanel.Collapse();
                }
                else
                {
                    await this.TileGroupPanel.CollapseNow();
                }
            }
        }

    }
}