Source/Ribbon/DesignTimeProviderContainer.cs

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using System.Drawing;
using System.Windows.Forms;

namespace DevComponents.DotNetBar
{
	/// <summary>
	/// Summary description for DesignTimeProviderContainer.
	/// </summary>
	public class DesignTimeProviderContainer
	{
		/// <summary>
		/// Returns information about insertion position for an item given screen coordinates. Used internally for drag&drop support.
		/// </summary>
		/// <param name="containerItem">Container item</param>
		/// <param name="pScreen">Screen coordinates</param>
		/// <param name="DragItem">Item that is being dragged</param>
		/// <returns>Information about insertion position or null if item cannot be inserted to the container.</returns>
		public static InsertPosition GetInsertPosition(BaseItem containerItem, Point pScreen, BaseItem DragItem)
		{
			InsertPosition objInsertPos=null;
            Control objContainer = null;

            if (containerItem is PopupItem && containerItem.Expanded)
                objContainer = ((PopupItem)containerItem).PopupControl;
            else
                objContainer = containerItem.ContainerControl as Control;
			
            if(objContainer==null)
				return null;

			Point pClient=objContainer.PointToClient(pScreen);
			Rectangle thisRect=containerItem.DisplayRectangle;
            if (containerItem is PopupItem && containerItem.Expanded)
                thisRect = objContainer.DisplayRectangle;
			if(thisRect.Contains(pClient) || containerItem.SubItems.Count==0 && objContainer.ClientRectangle.Contains(pClient) || containerItem is ItemContainer && ((ItemContainer)containerItem).SystemContainer && objContainer.ClientRectangle.Contains(pClient))
			{
				Rectangle r;
				BaseItem objItem;
				// Check first inside any expanded items
				objItem=containerItem.ExpandedItem();
				if(objItem!=null)
				{
					IDesignTimeProvider provider=objItem as IDesignTimeProvider;
					if(provider!=null)
					{
						objInsertPos=provider.GetInsertPosition(pScreen, DragItem);
						if(objInsertPos!=null)
							return objInsertPos;
					}
				}

				for(int i=0;i<containerItem.SubItems.Count;i++)
				{
					objItem=containerItem.SubItems[i];
					r=objItem.DisplayRectangle;
					r.Inflate(2,2);
					if(objItem.Visible && r.Contains(pClient))
					{
						if(objItem.SystemItem && containerItem.SubItems.Count!=1)
						{
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