Calendar buggy styles, and the OOP fix!
VGA found a recurrent problem most developers and users of the MS Calendar
control seem to have, namely, its poor integration with CSS styles. Being an
OOP fan, I clearly see an easy way to solve this problem. Inherit
Calendar and change its behavior! That's the cool thing about .NET and
the new ASP.NET. It's all too easy:
<![CDATA[
public class UnStyledCalendar : Calendar
{
protected override void Render(HtmlTextWriter writer)
{
base.Render (new NonStyleWriter( writer) );
}
}
]]>
Cool, huh? The "secret", of course, is the derived writer, which simply
implements a passthrough HtmlTextWriter descendant which skips
calls to the virtual AddStyleAttribute and WriteStyleAttribute
methods:
<![CDATA[
private class NonStyleWriter : HtmlTextWriter
{
HtmlTextWriter _writer;
public NonStyleWriter(HtmlTextWriter innerWriter) : base(innerWriter.InnerWriter)
{
_writer = innerWriter;
}
public override void AddAttribute(HtmlTextWriterAttribute key, string value)
{
_writer.AddAttribute(key, value);
}
// Passthrough all other methods
public override void AddStyleAttribute(HtmlTextWriterStyle key, string value)
{
// Do nothing here. We don't want style attributes!
}
public override void AddStyleAttribute(string name, string value)
{
// Do nothing here. We don't want style attributes!
}
public override void WriteStyleAttribute(string name, string value)
{
// Do nothing here. We don't want style attributes!
}
public override void WriteStyleAttribute(string name, string value, bool fEncode)
{
// Do nothing here. We don't want style attributes!
}
} ]]>
What you get is a calendar without ANY style="" attributes
whatsoever.
I leave the task of putting this into a library, copying the XSD from the MS
Calendar, installing it under the appropriate VS folder to get intellisense,
and toolbox item attribute to VGA, which excels in the matter ;). The code can
be downloaded from the
ASPNET2 Incubator
