using System.Windows;

namespace DatabaseImport
{
    /// <summary>
    /// Interaction logic for App.xaml
    /// </summary>
    public partial class App : Application
    {

        private static ISO13499FileDb _isoDb;
        public ISO13499FileDb IsoDb
        {
            get
            {
                if (null != _isoDb) return _isoDb;
                _isoDb = new ISO13499FileDb();
                _isoDb.RefreshAllData();
                return _isoDb;
            }
        }
        // Delegate for SetAppBusy and SetAppAvailable
        private delegate void SetAppBusyAvailableDelegate();

        // WaitCursor for SetAppBusy and SetAppAvailable
        private WaitCursor _wc;

        private static readonly object WaitCursorLock = new object();
        //        // Apply WaitCursor and disable application
        //        // recommend use before a try statement
        public void SetAppBusy()
        {
            //Can We access
            if (!Dispatcher.CheckAccess())
            {
                Dispatcher.BeginInvoke(new SetAppBusyAvailableDelegate(SetAppBusy));
                return;
            }
            if (null == MainWindow) return;
            lock (WaitCursorLock)
            {
                if (null != _wc) { _wc.Dispose(); }
                //Init WaitCursor
                _wc = new WaitCursor();
                //Enable App
                MainWindow.IsEnabled = false;
            }
        }

        // Apply normal cursor and enable application
        // recommend use in a finally statement
        public void SetAppAvailable()
        {
            //Can We access
            if (!Dispatcher.CheckAccess())
            {
                Dispatcher.BeginInvoke(new SetAppBusyAvailableDelegate(SetAppAvailable));
                return;
            }
            if (null == MainWindow) return;
            lock (WaitCursorLock)
            {
                //Dispose WaitCursor
                if (null != _wc) { _wc.Dispose(); _wc = null; }

                //Enable App
                MainWindow.IsEnabled = true;
            }
        }
    }
}