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CHAPTER 5 EVOLVING THE DEFAULT USER EXPERIENCE
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Combined with what you learned earlier about modifying the Site Settings page using CustomAction and HideCustomAction, you can get pretty decent results without breaking any supportability. And the even better part is that if you decide to reverse the changes, then all you need to do is deactivate the feature. As if by magic, your old link to the Microsoft page reappears.
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Using Delegate Controls
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If you have no idea what delegate controls are, be prepared to learn an incredibly powerful new feature of WSS. A delegate control is actually very simple in concept and works very much like a content placeholder that you know from regular ASP .NET. You create a DelegateControl in your page and then, using features, tell SharePoint what you want that delegate control to contain. The idea here is that you modify the page or pages using features, allowing you to deploy a page at one point and then later change how the page works. Why is this so cool when modifying the default user experience The default.master file that ships with SharePoint includes several delegate controls, meaning that you can modify the contents of default.master without even touching it. Oh there s more. Listen to this: even the application.master file contains three delegate controls. You get to decide what is there. Talk about free ride to customization heaven. Before you go around adding marquees and modifying CSS on your application pages, let s get the basics down. A delegate control has at least a ControlId attribute that is very important to you. When you want to fill the delegate control with custom goodness, you add a Control element to your elements.xml file and specify the ControlId value of the delegate control using the Id attribute. In addition, you need to specify a Sequence number. The sequence is just an ordering integer; in case you have several features that fill the same delegate control, the feature with the lowest sequence number gets priority. The final requirement of the Control element is to specify which control you want to put in the delegate control using the ControlSrc attribute. You can use any .ascx file that is accessible to the page. Take a look at the following code for an example: <Control Id="AdditionalPageHead" Sequence="5" ControlSrc="~/_controltemplates/MyAdditionalPageHead.ascx"></Control> Notice the Id attribute Id refers to a delegate control present in the out-of-the-box default.master and application.master files. I ve created a simple control in MyAdditionalPageHead.ascx just to illustrate this, but you can go completely bonkers and add basically anything you like. Here s my simple sample: <%@ Control Language="C#" ClassName="WebUserControl1" %> <script runat="server"> public override void RenderControl(HtmlTextWriter writer) { writer.Write("Look, no hands!"); } </script>
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CHAPTER 5 EVOLVING THE DEFAULT USER EXPERIENCE
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And, what demonstration would be complete without showing the mandatory result Figure 5-16 should satisfy your wildest dreams of customization options.
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Figure 5-16. That should whet your appetite.
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You can also use ControlAssembly and ControlClass instead of ControlSrc if you have a Tip
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compiled and strong-named server control that you want to use instead of the user control.
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The application.master file gives you three delegate controls to fill with your heart s desire. These are AdditionalPageHead, GlobalSiteLink1, and GlobalSiteLink2. If you examine the application.master files, however, you will notice that each GlobalSiteLink requires a feature scope of Farm, meaning you must have your feature scoped at the farm level in order for your control to fill these delegate controls. The default.master file also gives you a few delegate controls for your enjoyment. The most commonly used delegate control is the search box. Microsoft uses this when it modifies the search box when you install MOSS or Search Server 2007. Table 5-1 lists other delegate controls you can use.
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CHAPTER 5 EVOLVING THE DEFAULT USER EXPERIENCE
Table 5-1. Delegate Controls in default.master ControlId
AdditionalPageHead GlobalSiteLink0 GlobalSiteLink1 GlobalSiteLink2 SmallSearchInputBox TopNavigationDataSource PublishingConsole QuickLaunchDataSource
Description
Part of the HEAD HTML tag; same as for application.master Top of page, to the left of Welcome <Username> Top of page, to the right of Welcome <Username> Top of page, to the right of GlobalSiteLink1 Search box Navigation data source for top navigation bar Mostly used for MOSS Publishing Pages feature Navigation data source for QuickLaunch menu
A delegate control, like a content placeholder, can have a default value to be used if no Control element is activated. This is the case, for example, for QuickLaunchDataSource and TopNavigationDataSource, which provide default data sources unless you (or any feature you activate) override the controls. Cool, eh
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