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These days I started looking into Silverlight and unfortunately my time was spent more on finding sollutions than actually implement something. I am so used to ASP and WinForms that somehow the new way of doing things in SilverLight is making me dizzy.

I started looking into DataGrid mostly and found two strange things:

1. There is no double click event on a row
2. The <enter> key is not caught in the OnKeyDown handler.

Of course there are solutions to this and based on some nice community posts I made my own implementation for the datagrid which is listed below

    public class DataEventArgs : EventArgs
    {
        private object m_data;

        public object Data
        {
          get { return m_data; }
          set { m_data = value; }
        }
        
        public DataEventArgs() : base() { }
        public DataEventArgs(object data)
            : base()
        {
            this.m_data = data;
        }
    }

    public class CustomGrid : DataGrid
    {
        private long m_lastTick = 0;

        public event EventHandler<DataEventArgs> DoubleClick;

        public CustomGrid()
            : base()
        {
            this.MouseLeftButtonUp += new MouseButtonEventHandler(CustomGrid_MouseLeftButtonUp);
        }

        /// <summary>
        /// Handles the MouseLeftButtonUp event of the SilverCommanderGrid control.
        /// </summary>
        /// <param name="sender">The source of the event.</param>
        /// <param name="e">The instance containing the event data.</param>
        void CustomGrid_MouseLeftButtonUp(object sender, MouseButtonEventArgs e)
        {
            if ((DateTime.Now.Ticks - m_lastTick) < 2310000)
            {
                if (DoubleClick != null)
                    DoubleClick(this, new DataEventArgs(e.OriginalSource));
            }
            m_lastTick = DateTime.Now.Ticks;
        }

        /// <summary>
        /// Called before the <see cref="E:System.Windows.UIElement.KeyDown"/> event occurs.
        /// Added to suppress the default behaviour on pressing the enter key.
        /// </summary>
        /// <param name="e">The data for the event.</param>
        protected override void OnKeyDown(KeyEventArgs e)
        {
            if (e.Key != Key.Enter)
                base.OnKeyDown(e);
            else
            {
                e.Handled = true;
                this.Focus();
            }
        }
    }

I will come back later with changes to this class if I find any other problems with it. Although maybe there are no changes to be added but only to our attitude towards development. There is a new style of programming brewing on the horizon and we have to weather it somehow.

This entry was posted on Friday, August 28th, 2009 at 4:11 pm and is filed under .NET. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.