/// <summary>
/// Edits the specified object's value using the editor style indicated by the <see cref="M:System.Drawing.Design.UITypeEditor.GetEditStyle" /> method.
/// </summary>
/// <param name="context">An <see cref="T:System.ComponentModel.ITypeDescriptorContext" /> that can be used to gain additional context information.</param>
/// <param name="provider">An <see cref="T:System.IServiceProvider" /> that this editor can use to obtain services.</param>
/// <param name="value">The object to edit.</param>
/// <returns>The new value of the object. If the value of the object has not changed, this should return the same object it was passed.</returns>
public override object EditValue(System.ComponentModel.ITypeDescriptorContext context, IServiceProvider provider, object value)
{
if ((provider == null) ||
(provider.GetService(typeof(IWindowsFormsEditorService)) == null))
{
return(value);
}
if (_filedialog == null)
{
_filedialog = new OpenFileDialog();
_filedialog.Filter = "Icons(*.ico)|*.ico";
}
if (_filedialog.ShowDialog() == DialogResult.OK)
{
try
{
using (FileStream stream = new FileStream(_filedialog.FileName,
FileMode.Open,
FileAccess.Read,
FileShare.Read))
{
byte[] buffer = new byte[stream.Length];
stream.Read(buffer, 0, buffer.Length);
using (MemoryStream mstr = new MemoryStream(buffer))
{
value = new IconEncoder(mstr);
}
}
}
catch {}
}
return(value);
}
/// <summary>
/// adds the specified icon to the collection
/// </summary>
/// <param name="value">The value.</param>
public void Add(IconEncoder value)
{
if (value == null)
{
return;
}
this.List.Add(value);
}
/// <summary>
/// constructs an icon from a dll resource
/// </summary>
/// <param name="hlibrary">The hlibrary.</param>
/// <param name="resourceid">The resourceid.</param>
/// <returns>IconEncoder.</returns>
/// <exception cref="System.ArgumentException">resourceid is invalid type - resourceid</exception>
/// <exception cref="System.Exception">
/// this is not an icon file
/// or
/// no iconimages contained
/// </exception>
private static IconEncoder IconFromLibrary(IntPtr hlibrary, object resourceid)
{
IntPtr hicon;
//is_intresource
if (resourceid is int)
{
hicon = Kernel32.FindResource(hlibrary, (int)resourceid, Kernel32.RT_GROUP_ICON);
}
else if (resourceid is string)
{
hicon = Kernel32.FindResource(hlibrary, (string)resourceid, Kernel32.RT_GROUP_ICON);
}
else
{
throw new ArgumentException("resourceid is invalid type", "resourceid");
}
//open stream
MEMICONDIRENTRY[] entries;
using (Stream str = Kernel32.GetStreamFromResource(hlibrary, hicon))
{
ICONDIR header = new ICONDIR(str);
if (header.idType != 1)
{
throw new Exception("this is not an icon file");
}
if (header.idCount < 1)
{
throw new Exception("no iconimages contained");
}
//read headers
entries = new MEMICONDIRENTRY[header.idCount];
for (int i = 0; i < entries.Length; i++)
{
entries[i] = new MEMICONDIRENTRY(str);
}
}
IconEncoder ret = new IconEncoder();
//read images
for (int i = 0; i < entries.Length; i++)
{
//stream for single image
using (Stream str = Kernel32.GetStreamFromResource(hlibrary,
Kernel32.FindResource(hlibrary, entries[i].ID, Kernel32.RT_ICON)))
{
ret.Images.Add(IconImage.FromStream(str));
}
}
return(ret);
}
/// <summary>
/// Paints a representation of the value of an object using the specified <see cref="T:System.Drawing.Design.PaintValueEventArgs" />.
/// </summary>
/// <param name="e">A <see cref="T:System.Drawing.Design.PaintValueEventArgs" /> that indicates what to paint and where to paint it.</param>
public override void PaintValue(PaintValueEventArgs e)
{
if (e.Value is IconEncoder)
{
IconEncoder icn = (IconEncoder)e.Value;
Rectangle bounds = e.Bounds;
bounds.Width--;
bounds.Height--;
if (icn.Images.Count > 0)
{
e.Graphics.DrawImage(icn.Images[0].Bitmap, bounds);
}
e.Graphics.DrawRectangle(SystemPens.WindowFrame, bounds);
}
}