DropDown list for a property built from a file

[GaryAlbers]

Can anybody point me to a code snipet or describe how to have a drop down list in the properties dialog? I am aware of enums but that will not work because I need the list of values to be derived from a file and built at runtime, not compile time.

Thanks,
Gary

[NinjaTrader_Bertrand]

Sorry Gary, I would unfortunately not be aware of such an example - the enums sample is the only official bit we can offer in this area.

[GaryAlbers]

The following code seems to be in the right direction but I still need suggestions on how to:
- Make content of ComboBox show up when user clicks on down arrow
(currently shows empty list even though list has 2 items).

- turn off display of full property list of the ComboBox
(currently a plus sign shows up on left and expands into full property sheet of ComboBox)

- Make input editable
(currently typing into are is not being allowed)

- Determine why a new instance of the ComboBox is created when sent back into the PropOne.set method.

Unofficial help is welcome

Thanks,
Gary

Here is the code:

<code>
#region Using declarations
using System;
using System.ComponentModel;
using System.Diagnostics;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Xml.Serialization;
using NinjaTrader.Cbi;
using NinjaTrader.Data;
using NinjaTrader.Gui.Chart;
using System.Windows.Forms;
#endregion

// This namespace holds all indicators and is required. Do not change it.
namespace NinjaTrader.Indicator
{
    /// <summary>
    /// Enter the description of your new custom indicator here
    /// </summary>
    [Description("Enter the description of your new custom indicator here")]
    public class GTestDropDown : Indicator
    {
		private ComboBox propOneCB;

        protected override void Initialize()
        {
			try
			{
				propOneCB = new ComboBox();
				propOneCB.Items.Add("1");
				propOneCB.Items.Add("2");
			}
			catch (Exception e)
			{
				Print("-----"+e.ToString());
			}
            Overlay				= false;
        }

        protected override void OnBarUpdate()
        {
        }

        [Description("")]
        [GridCategory("Parameters")]
        public ComboBox PropOne
        {
            get { return propOneCB; }
            set { Print("value="+value); }
        }
    }
}
</code>

[sierikas]

Gary, many thanks!!!!

[GaryAlbers]

sierikas,

I'd like to say your welcome, but the code is incomplete.
I cannot use it. Can you?
If you have figured out a way to use it, let me know.

-Gary

[borland]

Gary,

I haven't really looked over this stuff in detail, but it looks like you and others might find these links helpful.

You mentioned you knew how to do DropDown Lists (ComboBox) by declaring enum's.. Snaphook uploaded this Indicator which does this..

http://www.ninjatrader.com/support/forum/local_links.php?s=&catid=4&filter=&sort=N&page=1&pp=20&keyid=62&doit=Go

Got that from this NT forum thread

http://www.ninjatrader.com/support/forum/showthread.php?t=5782

Now back to the workaround for the enum problem, take a look at this thread

http://stackoverflow.com/questions/3065526/how-to-get-an-enum-value-from-an-assembly-using-late-binding-in-c-sharp

And this .NET framework reference sample code at the bottom of the page..

http://msdn.microsoft.com/en-us/library/system.codedom.compiler.codedomprovider.aspx

Hope that helps.