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C04620245.fm Page 124 Thursday, June 3, 2004 4:51 PM
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Part I ASP.NET Essentials
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Working with Themes
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A theme includes skins defined for a variety of server controls. When you work with themes, you actually work with control skins. This is also the case when you create custom themes. Skins are a layer of user interface properties placed on top of specified controls. Skins are normally set at design time, but in some cases they can also be modified programmatically.
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The SmokeAndGlass Built-In Theme
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A skin file is a text file that contains a series of markup declarations, much like the layout part of an .aspx page. The built-in SmokeAndGlass theme contains the following definitions for Textbox and Button controls:
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<asp:TextBox runat="server BackColor="#FFFFFF BorderStyle="Solid Font-Size="0.9em Font-Names="Verdana ForeColor="#585880 BorderColor="#585880 BorderWidth="1pt CssClass="theme_textbox /> <asp:Button runat="server BorderColor="#585880 Font-Bold="true BorderWidth="1pt ForeColor="#585880 BackColor="#F8F7F4 />
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Those settings are the new default values for the controls. Note that if you redefine, say, the BackColor property in the markup of the .aspx file, that setting is ignored. The reason is that the theme settings are applied to controls immediately after instantiation. This means, for example, that each TextBox control is created with the background color you set in the .aspx markup, but one second later it receives the background color set in the skin.
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You cannot declaratively override the value of property set in a skin file. If you want to override the skin value of control property, you have to place some code in the Page_Init or Page_Load event:
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void Page_Init (object sender, EventArgs e) { // Override the default settings of the skin NewColor.BackColor = Color.Cyan; }
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Note
Theming Your Pages and Controls
Associating a theme with a page is easy. You assign the name of your theme of choice to the Theme attribute on the @Page directive, and you re all set:
C04620245.fm Page 125 Thursday, June 3, 2004 4:51 PM
4 Personalization: User Profiles and Themes
<%@Page Language="C# Theme="SmokeAndGlass %>
Bear in mind that the name of the theme must match the name of a subdirectory under the Themes path, as mentioned earlier. You can automatically give the same theme to all the pages in the site. To do so, you modify the web.config file in the root of the application so that it includes the following block:
<configuration> <system.web> <pages theme="SmokeAndGlass /> </system.web> </configuration>
Finally, to ensure that a certain control is rendered according to the look and feel of a particular theme, you set the control s SkinID property:
<asp:Calendar runat="server ID="MyCalendar SkinID="SmokeAndGlass />
The SkinID property refers to a particular skin within the page s theme. Using this trick, you can have different controls of the same type using different skins. If the page theme doesn t include a skin that matches the SkinID property, the default skin for that control type is used. The following code shows how to create two named skins for a button within the same theme:
<!-- Place these two definitions in the same .skin file --> <asp:button id="skinClassic BackColor="gray /> <asp:button id="skinTrendy BackColor="lightcyan />
A named skin is simply a skin that has an ID. Skins without an ID are said to be the default skins for a control. By default, any property on any control on a page can be overridden by a skin. You can thus use themes to easily customize a page that has no knowledge of skins, including existing pages written for ASP.NET 1.x. However, the ASP.NET 2.0 theming infrastructure provides the EnableTheming property to disable skins for a control and all its children. Note that the EnableTheming property can be overridden in a derived class so that theming can be disabled by default. Also, you can block any overriding of the theming capabilities of a control by applying the EnableTheming attribute to the control declaration. (This holds true for custom controls only.)
[EnableTheming(false)] public MyControl : Control {...}
With the above setting, MyControl and any derived controls don t support theming. In ASP.NET 2.0, the HtmlForm and the HtmlHead controls can t be themed. You can also enable and disable theming on individual properties, by
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