using System;
using System.Collections.Generic;
using System.Text;
using System.Drawing;
using System.Windows.Forms;
using Aga.Controls.Properties;
using System.ComponentModel;
namespace Aga.Controls.Tree.NodeControls{
public class NodeIcon : BindableControl
{
public NodeIcon()
{
LeftMargin = 1;
}
public override Size MeasureSize(TreeNodeAdv node, DrawContext context)
{
Image image = GetIcon(node);
if (image != null)
return image.Size;
else
return Size.Empty;
}
public override void Draw(TreeNodeAdv node, DrawContext context)
{
Image image = GetIcon(node);
if (image != null)
{
Rectangle r = GetBounds(node, context);
if ( image.Width > 0 && image.Height > 0 )
{
switch (_scaleMode)
{
case ImageScaleMode.Fit:
context.Graphics.DrawImage(image, r);
break;
case ImageScaleMode.ScaleDown:
{
float factor = Math.Min((float)r.Width / (float)image.Width, (float)r.Height / (float)image.Height);
if (factor < 1)
context.Graphics.DrawImage(image, r.X, r.Y, image.Width * factor, image.Height * factor);
else
context.Graphics.DrawImage(image, r.X, r.Y, image.Width, image.Height);
} break;
case ImageScaleMode.ScaleUp:
{
float factor = Math.Max((float)r.Width / (float)image.Width, (float)r.Height / (float)image.Height);
if (factor > 1)
context.Graphics.DrawImage(image, r.X, r.Y, image.Width * factor, image.Height * factor);
else
context.Graphics.DrawImage(image, r.X, r.Y, image.Width, image.Height);
} break;
case ImageScaleMode.AlwaysScale:
{
float fx = (float)r.Width / (float)image.Width;
float fy = (float)r.Height / (float)image.Height;
if (Math.Min(fx, fy) < 1)
{ //scale down
float factor = Math.Min(fx, fy);
context.Graphics.DrawImage(image, r.X, r.Y, image.Width * factor, image.Height * factor);
}
else if (Math.Max(fx, fy) > 1)
{
float factor = Math.Max(fx, fy);
context.Graphics.DrawImage(image, r.X, r.Y, image.Width * factor, image.Height * factor);
}
else
context.Graphics.DrawImage(image, r.X, r.Y, image.Width, image.Height);
} break;
case ImageScaleMode.Clip:
default:
context.Graphics.DrawImage(image, r.X, r.Y, image.Width, image.Height);
break;
}
}
}
}
protected virtual Image GetIcon(TreeNodeAdv node)
{
return GetValue(node) as Image;
}
private ImageScaleMode _scaleMode = ImageScaleMode.Clip;
[DefaultValue("Clip"), Category("Appearance")]
public ImageScaleMode ScaleMode
{
get { return _scaleMode; }
set { _scaleMode = value; }
}
}
}
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