NodeStateIcon.cs :  » GUI » TreeViewAdv » Aga » Controls » Tree » NodeControls » C# / CSharp Open Source

using System;
using System.Collections.Generic;
using System.Text;
using System.Drawing;
using Aga.Controls.Properties;

namespace Aga.Controls.Tree.NodeControls{
  public class NodeStateIcon: NodeIcon
  {
    private Image _leaf;
    private Image _opened;
    private Image _closed;

    public NodeStateIcon()
    {
      _leaf = MakeTransparent(Resources.Leaf);
      _opened = MakeTransparent(Resources.Folder);
      _closed = MakeTransparent(Resources.FolderClosed);
    }

    private static Image MakeTransparent(Bitmap bitmap)
    {
      bitmap.MakeTransparent(bitmap.GetPixel(0,0));
      return bitmap;
    }

    protected override Image GetIcon(TreeNodeAdv node)
    {
      Image icon = base.GetIcon(node);
      if (icon != null)
        return icon;
      else if (node.IsLeaf)
        return _leaf;
      else if (node.CanExpand && node.IsExpanded)
        return _opened;
      else
        return _closed;
    }
  }
}