Source/AdvTree/Display/NodeExpandDisplay.cs

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using System.Drawing;
using System.Drawing.Drawing2D;
using DevComponents.DotNetBar;

namespace DevComponents.AdvTree
{
	namespace Display
	{
		/// <summary>
		/// Base class for node expand button display.
		/// </summary>
		public abstract class NodeExpandDisplay
		{
			/// <summary>Creates new instance of the class</summary>
			public NodeExpandDisplay()
			{
			}

			/// <summary>Draws expand button.</summary>
			/// <param name="e">Context parameters for drawing expand button.</param>
			public abstract void DrawExpandButton(NodeExpandPartRendererEventArgs e);

			protected Pen GetBorderPen(NodeExpandPartRendererEventArgs e)
			{
                if(!e.BorderColor.IsEmpty)
                    return new Pen(e.BorderColor,1);
                if (_ColorTable != null)
                {
                    bool expanded = e.Node.Expanded;
                    TreeExpandColorTable ct = GetExpandColorTable(e);
                    if (ct == null) return null;
                    if (expanded)
                    {
                        // Collapse node colors
                        if (!e.IsMouseOver && ct.CollapseBorder != null)
                            return ct.CollapseBorder.CreatePen();
                        else if (e.IsMouseOver && ct.CollapseMouseOverBorder != null)
                            return ct.CollapseMouseOverBorder.CreatePen();
                    }
                    else
                    {
                        // Expand node colors
                        if (!e.IsMouseOver && ct.ExpandBorder != null)
                            return ct.ExpandBorder.CreatePen();
                        else if (e.IsMouseOver && ct.ExpandMouseOverBorder != null)
                            return ct.ExpandMouseOverBorder.CreatePen();
                    }
                }
                return null;
			}

            private TreeExpandColorTable GetExpandColorTable(NodeExpandPartRendererEventArgs e)
            {
                TreeExpandColorTable ct = null;
                if (e.ExpandButtonType == eExpandButtonType.Rectangle)
                    ct = _ColorTable.ExpandRectangle;
                else if (e.ExpandButtonType == eExpandButtonType.Triangle)
                    ct = _ColorTable.ExpandTriangle;
                else if (e.ExpandButtonType == eExpandButtonType.Ellipse)
                    ct = _ColorTable.ExpandEllipse;