Example Analysis of Shell related Class system in Xamarin.FormsShell

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In Shell, the most important class is the Shell class. The Shell class implements the basic UI functionality required by most applications. In addition, commonly used classes are ShellContent, Tab, FlyoutItem, MenuItem, and SearchHandler. The following is an introduction to these classes.

ShellContent: the content page of the application, the intermediate content in figures 1.2 and 1.3 is implemented using this class.

Tab: tags, commonly used in label bars and sideslip menus. The tags in the tag bar in figures 1.2 and 1.3 are implemented using this class.

FlyoutItem: side slip menus. The side slide menus in figures 1.14 and 1.15 are implemented using this class.

MenuItem: menu items, used when populating menu items for side slide menus.

SearchHandler: search handle, which is used when Shell implements the search function.

The structure of these classes is shown in figure 1.16. Where the class marked by double wireframe is abstract.

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