using System.Windows.Forms;
using System;


namespace Implab.Fx {
    public class ControlBoundPromise<T> : Promise<T> {
        readonly Control m_target;

        public ControlBoundPromise(Control target) {
            Safe.ArgumentNotNull(target, "target");

            m_target = target;
        }

        protected override void SignalSuccess(IDeferred<T> handler) {
            if (m_target.InvokeRequired)
                m_target.BeginInvoke(new Action<IDeferred<T>>(base.SignalSuccess), handler);
            else
                base.SignalSuccess(handler);
        }

        protected override void SignalCancelled(IDeferred<T> handler, Exception reason) {
            if (m_target.InvokeRequired)
                m_target.BeginInvoke(new Action<IDeferred<T>,Exception>(base.SignalCancelled), handler, reason);
            else
                base.SignalCancelled(handler, reason);
        }

        protected override void SignalError(IDeferred<T> handler, Exception error) {
            if (m_target.InvokeRequired)
                m_target.BeginInvoke(new Action<IDeferred<T>,Exception>(base.SignalError), handler, error);
            else
                base.SignalError(handler, error);
        }

    }
}