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Figure 27-3. Adding a custom control to the Toolbox Not only does the WebControl class include basic style-related properties such as Font, ForeColor, BackColor, and so on, but it also renders them automatically in the control tag. Here s how it works: the WebControl assumes that it should add the attributes to a single HTML tag, called the base tag. If you re writing multiple elements, the attributes are added to the outermost element that contains the other elements. You specify the base tag for your web control in the constructor. Finally, you don t override the Render() method. The WebControl already includes an implementation of Render() that farms the work out to the following three methods: RenderBeginTag(): This method is called to write the opening tag for your control, along with the attributes you ve specified. RenderContents(): This method writes everything between the start and end tag, which can include text content or other HTML tags. This is the method you ll override most often to write your custom control content. RenderEndTag(): This method is called to write the closing tag for your control. Of course, you can change this behavior by overriding the Render() method, if needed. But if this basic framework suits your needs, you ll be able to accomplish quite a bit with little custom code. The next example demonstrates a new link control that derives from WebControl and thereby gains automatic support for style properties. public class LinkWebControl : WebControl { ... } The default constructor calls the WebControl constructor. More than one version of WebControl constructor exists this code uses the version that allows you to specify a base control tag. In this example, the base control tag is the <a> anchor, as shown here: public LinkWebControl() : base(HtmlTextWriterTag.A) {}

The LinkWebControl constructor doesn t require any actual code. It s just important that you use this opportunity to call the WebControl constructor to set the base control tag. If you use the default (zero-parameter) WebControl constructor, a <span> tag is used automatically. You can then render additional HTML inside this <span> tag, which ensures that all elements will have the same style attributes. The LinkWebControl also defines two properties, which allow the web page to set the text and the target URL: private string text; public string Text { get {return text;} set {text = value;} } private string hyperLink; public string HyperLink { get {return hyperLink;} set { if (value.IndexOf("http://") == -1) { throw new ApplicationException("Specify HTTP as the protocol."); } else { hyperLink = value; } } } You could set the text and hyperLink variables to empty strings when you define them. However, this example overrides the OnInit() method to demonstrate how you can initialize a control programmatically: protected override void OnInit(EventArgs e) { base.OnInit(e); if (hyperLink == null) hyperLink = "http://www.apress.com"; if (text == null) text = "Click here to visit Apress"; } The LinkWebControl presents a minor challenge. To successfully create an <a> tag, you need to specify a target URL and some text. The text is placed between the start and end tags. However, the URL is added as an attribute (named href) to the start tag. As you ve already learned, the WebControl manages the attributes for the start tag automatically. Fortunately, the WebControl class gives you the ability to add extra tags by overriding the method AddAttributesToRender(), as shown here: protected override void AddAttributesToRender(HtmlTextWriter output) { output.AddAttribute(HtmlTextWriterAttribute.Href, HyperLink); base.AddAttributesToRender(output); }

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Instead of relying on thread locals, another approach is to consider the actual use case. Typically, people turn to thread locals as a way of storing the current user in a table while using the built-in admin application. Custom views make it easy enough to insert the user manually, so it s usually the admin interface that prompts developers to investigate these techniques. Shortly before Django 1.0 was released, the admin application was overhauled in order to provide more flexibility and features. One of the additions was a result of the desire to access the current user while working in the admin. Now there is a way to override how the admin saves a given model, also providing access to the request object along the way. Remember the definition of from the previous section:

Note that whenever a custom control overrides a method, it should call the base class implementation using the base keyword. This ensures that you don t inadvertently suppress any code that needs to run. Often, all the base method does is fire a related event, but that s not always the case. For example, if you override RenderBeginTag() and don t call the base implementation, the rendering code will fail with an unhandled exception because the tag isn t opened. Finally, the RenderContents() method adds the text inside the anchor: protected override void RenderContents(HtmlTextWriter output) { output.Write(Text); base.RenderContents(output); } Note that the code doesn t use the style properties. Instead, ASP.NET applies these automatically when it renders the base tag. Now that you have created the control, you can use it in any ASP .NET web page. You can set the style properties in code or in the control tag. You can even use the Properties window. Here s an example: <apress:LinkWebControl id="LinkWebControl1" runat="server" BackColor="#FFFF80" Font-Names="Verdana" Font-Size="Large" ForeColor="#C00000" Text="Click to visit Apress" HyperLink="http://www.apress.com"></apress:LinkWebControl> The HyperLink and Text attributes are automatically mapped to the corresponding public properties of the custom control. The same is true of the style-related properties, which are defined in the base WebControl class. Figure 27-4 shows this control in a web browser.

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