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3 The Page Rendering Model
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Layout Considerations
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You might have noticed when building the last page that the layout of the page flowed . That is, every time you dropped a control onto the page, the Designer forced it up against the placement of the previous control . If you ve worked with earlier versions of Visual Studio, you know that this is different default behavior . Visual Studio 2003 uses absolute positioning for elements on a page (which is what you re used to if you ve done rich client or standard Windows development) . Although today Visual Studio 2010 does not let you set positioning styles directly in the Designer, you can apply different positioning options using a style that applies to the whole page or to single elements in the page . To add a new style to the page, make sure the Designer is showing in the window and click Format, New Style from the main Visual Studio menu . The New Style dialog box opens:
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To change the layout options using the style, select Position in the Category list on the left side of the dialog box . Notice the combo selection for setting positions . Once you ve set up a style, you can apply it to various elements on the page by referring to the class name through the element s CssClass property . By changing the positioning options, you can apply various kinds of layout assignments to the page . Play around with them a bit because that s the only way to get a feel for how they work . You explore styles in greater depth later in the discussion of master pages in 7, A Consistent Look and Feel .
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Part I Fundamentals
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.3 .Quick .Reference
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Switch between ASPX Source code mode and Designer mode Add a server-side control to a page
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Click the Design or Source tab, which both usually appear near the bottom left side of the editor window . You can also use the Split tab to see both the Source and Design views at once . Open the Toolbox if it s not already showing by clicking View, Toolbox on the main menu . (You can use the key combinations Ctrl+W and Ctrl+X also .) Click the control in the Toolbox . Drag the control onto the page . Make sure the page editor is in Design mode . Highlight the control whose property you want to change . Select the property to edit in the Properties pane . In Source code editing mode, edit the Page directive to include the attribute Trace= true . Or Select the Document element from the combo box near the top of the Properties pane . Set the Trace property to true .
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Change the properties of controls on a page
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Turn on tracing
Change the size of a server-side control
Click the control to highlight it . Click one of the handles appearing on the border of the control and drag the mouse until the control is the correct size . Double-click the control for which you want to handle the event . The code editor will appear, allowing you to add the code necessary to handle the specific event . Add a new style to the page by clicking Format, New Style on the main menu . Click Layout on the main menu and develop a style (defining a style also includes other elements in addition to the layout options, such as font face, size, and margins) . Apply the style to the page or to single elements .
Add a handler for a control s default event
Change the layout characteristics of a page
4
Custom Rendered Controls
After completing this chapter, you will be able to
n n n n n n
Add a new project to the existing project in a Microsoft Visual Studio solution file . Create a server-side control that renders custom HTML . Add a server-side control to the Visual Studio Toolbox . Place a server-side control on a Web Form . Manage events in the control . Use ASP .NET to detect differences in client browsers and apply that information .
3, The Page Rendering Model, describes the fundamental architecture behind the ASP .NET rendering model . System.Web.UI.Page manages a list of server-side controls, and it s the job of each server-side control to render a particular portion of the page . ASP .NET broadly classifies server-side controls into two categories:
Rendering controls (controls that completely manage the rendering process) Composite controls (multiple server-side controls bundled into a single unit)
This chapter focuses on the first type: custom rendered controls . In this chapter, you will see how the control works once it s part of a Web page . Along the way, the chapter covers topics such as how controls manage events and how they detect the differences in client browsers . First, start by looking at the heart of the ASP .NET server-side control architecture the System.Web.UI.Control class .
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