3rdpartylibs/fastreports.wpf/FastReport.Forms.WPF/Controls/ToggleButtonBase.cs

using System.Drawing;

namespace System.Windows.Forms
{
    public class ToggleButtonBase : ButtonBase
    {
        protected new System.Windows.Controls.Primitives.ToggleButton control { get; private set; }

        public bool Checked 
        { 
            get => control.IsChecked ?? false; 
            set => control.IsChecked = value; 
        }

        public CheckState CheckState
        {
            get
            {
                return control.IsChecked == true ? CheckState.Checked : 
                    (control.IsChecked == false ? CheckState.Unchecked : CheckState.Indeterminate);
            }
            set
            {
                control.IsChecked = value == CheckState.Checked ? true :
                    (value == CheckState.Unchecked ? false : null);
            }
        }

        public ContentAlignment CheckAlign { get; set; } // not supported

        public bool ThreeState
        {
            get => control.IsThreeState;
            set => control.IsThreeState = value;
        }

        public event EventHandler CheckedChanged;

        protected virtual void OnCheckedChanged(EventArgs e) => CheckedChanged?.Invoke(this, e);

        public override void Select() => Checked = true;

        protected void SetControl(System.Windows.Controls.Primitives.ToggleButton control)
        {
            base.SetControl(control);
            this.control = control;
            control.Checked += (sender, e) => OnCheckedChanged(e);
            control.Unchecked += (sender, e) => OnCheckedChanged(e);
            TextAlign = System.Drawing.ContentAlignment.MiddleLeft;
        }
    }
}