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//-----------------------------------------------------------------------
// <copyright file="SelectorButton.cs" company="Outercurve Foundation">
// Copyright (c) Outercurve Foundation. All rights reserved.
// </copyright>
//-----------------------------------------------------------------------
namespace DotNetOpenAuth.OpenId.RelyingParty {
using System;
using System.Diagnostics.Contracts;
using System.Web.UI;
/// <summary>
/// A button that would appear in the <see cref="OpenIdSelector"/> control via its <see cref="OpenIdSelector.Buttons"/> collection.
/// </summary>
[ContractClass(typeof(SelectorButtonContract))]
public abstract class SelectorButton {
/// <summary>
/// Initializes a new instance of the <see cref="SelectorButton"/> class.
/// </summary>
protected SelectorButton() {
}
/// <summary>
/// Ensures that this button has been initialized to a valid state.
/// </summary>
/// <remarks>
/// This is "internal" -- NOT "protected internal" deliberately. It makes it impossible
/// to derive from this class outside the assembly, which suits our purposes since the
/// <see cref="OpenIdSelector"/> control is not designed for an extensible set of button types.
/// </remarks>
internal abstract void EnsureValid();
/// <summary>
/// Renders the leading attributes for the LI tag.
/// </summary>
/// <param name="writer">The writer.</param>
protected internal abstract void RenderLeadingAttributes(HtmlTextWriter writer);
/// <summary>
/// Renders the content of the button.
/// </summary>
/// <param name="writer">The writer.</param>
/// <param name="selector">The containing selector control.</param>
protected internal abstract void RenderButtonContent(HtmlTextWriter writer, OpenIdSelector selector);
}
}
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