Revert "Merge branch 'documentation'"7.6.0.beta2

This reverts commit f6874bde3d945c8b2d1b5c17ab50e2d0f1f8ff00.

Change-Id: I67ee1c30ba3e3bcc3c43a1dd2e73a822791514bf

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diff --git a/documentation/application/application-architecture.asciidoc b/documentation/application/application-architecture.asciidoc
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----
-title: Building the UI
-order: 2
-layout: page
----
-
-[[application.architecture]]
-= Building the UI
-
-Vaadin user interfaces are built hierarchically from components, so that the
-leaf components are contained within layout components and other component
-containers. Building the hierarchy starts from the top (or bottom - whichever
-way you like to think about it), from the [classname]#UI# class of the
-application. You normally set a layout component as the content of the UI and
-fill it with other components.
-
-
-[source, java]
-----
-public class MyHierarchicalUI extends UI {
-    @Override
-    protected void init(VaadinRequest request) {
-        // The root of the component hierarchy
-        VerticalLayout content = new VerticalLayout();
-        content.setSizeFull(); // Use entire window
-        setContent(content);   // Attach to the UI
-        
-        // Add some component
-        content.addComponent(new Label("Hello!"));
-        
-        // Layout inside layout
-        HorizontalLayout hor = new HorizontalLayout();
-        hor.setSizeFull(); // Use all available space
-
-        // Couple of horizontally laid out components
-        Tree tree = new Tree("My Tree",
-                TreeExample.createTreeContent());
-        hor.addComponent(tree);
-
-        Table table = new Table("My Table",
-                TableExample.generateContent());
-        table.setSizeFull();
-        hor.addComponent(table);
-        hor.setExpandRatio(table, 1); // Expand to fill
-
-        content.addComponent(hor);
-        content.setExpandRatio(hor, 1); // Expand to fill
-    }
-}
-----
-
-The component hierarchy could be illustrated with a tree as follows:
-
-
-----
-UI
- `-- VerticalLayout
-   |-- Label
-   `-- HorizontalLayout
-     |-- Tree
-     `-- Table
-----
-
-The result is shown in <<figure.application.architecture.example>>.
-
-[[figure.application.architecture.example]]
-.Simple Hierarchical UI
-image::img/ui-architecture-hierarchical.png[]
-
-Instead of building the layout in Java, you can also use a declarative design,
-as described later in
-<<dummy/../../../framework/application/application-declarative#application.declarative,"Designing
-UIs Declaratively">>. The examples given for the declarative layouts give
-exactly the same UI layout as built from the components above.
-
-The built-in components are described in
-<<dummy/../../../framework/components/components-overview.asciidoc#components.overview,"User
-Interface Components">> and the layout components in
-<<dummy/../../../framework/layout/layout-overview.asciidoc#layout.overview,"Managing
-Layout">>.
-
-The example application described above just is, it does not do anything. User
-interaction is handled with event listeners, as described a bit later in
-<<dummy/../../../framework/application/application-events#application.events,"Handling
-Events with Listeners">>.
-
-[[application.architecture.architecture]]
-== Application Architecture
-
-Once your application grows beyond a dozen or so lines, which is usually quite
-soon, you need to start considering the application architecture more closely.
-You are free to use any object-oriented techniques available in Java to organize
-your code in methods, classes, packages, and libraries. An architecture defines
-how these modules communicate together and what sort of dependencies they have
-between them. It also defines the scope of the application. The scope of this
-book, however, only gives a possibility to mention some of the most common
-architectural patterns in Vaadin applications.
-
-The subsequent sections describe some basic application patterns. For more
-information about common architectures, see
-<<dummy/../../../framework/advanced/advanced-architecture#advanced.architecture,"Advanced
-Application Architectures">>, which discusses layered architectures, the
-Model-View-Presenter (MVP) pattern, and so forth.
-
-ifdef::web[]
-The
-<<dummy/../../../framework/advanced/advanced-global#advanced.global,"Accessing
-Session-Global Data">> discusses the problem of passing essentially global
-references around, a common problem which is also visited in
-<<application.architecture.accessing>>.
-endif::web[]
-
-
-[[application.architecture.composition]]
-== Compositing Components
-
-User interfaces typically contain many user interface components in a layout
-hierarchy. Vaadin provides many layout components for laying contained
-components vertically, horizontally, in a grid, and in many other ways. You can
-extend layout components to create composite components.
-
-
-[source, java]
-----
-class MyView extends VerticalLayout {
-    TextField entry   = new TextField("Enter this");
-    Label     display = new Label("See this");
-    Button    click   = new Button("Click This");
-
-    public MyView() {
-        addComponent(entry);
-        addComponent(display);
-        addComponent(click);
-        
-        // Configure it a bit
-        setSizeFull();
-        addStyleName("myview");
-    }
-}
-
-// Use it
-Layout myview = new MyView();
-----
-
-This composition pattern is especially supported for creating forms, as
-described in
-<<dummy/../../../framework/datamodel/datamodel-itembinding#datamodel.itembinding.formclass,"Binding
-Member Fields">>.
-
-While extending layouts is an easy way to make component composition, it is a
-good practice to encapsulate implementation details, such as the exact layout
-component used. Otherwise, the users of such a composite could begin to rely on
-such implementation details, which would make changes harder. For this purpose,
-Vaadin has a special [classname]#CustomComponent# wrapper, which hides the
-content representation.
-
-
-[source, java]
-----
-class MyView extends CustomComponent {
-    TextField entry   = new TextField("Enter this");
-    Label     display = new Label("See this");
-    Button    click   = new Button("Click This");
-
-    public MyView() {
-        Layout layout = new VerticalLayout();
-        
-        layout.addComponent(entry);
-        layout.addComponent(display);
-        layout.addComponent(click);
-        
-        setCompositionRoot(layout);
-        
-        setSizeFull();
-    }
-}
-
-// Use it
-MyView myview = new MyView();
-----
-
-For a more detailed description of the [classname]#CustomComponent#, see
-<<dummy/../../../framework/components/components-customcomponent#components.customcomponent,"Composition
-with CustomComponent">>.
-
-
-[[application.architecture.navigation]]
-== View Navigation
-
-While the most simple applications have just a single __view__ (or __screen__),
-perhaps most have many. Even in a single view, you often want to have sub-views,
-for example to display different content.
-<<figure.application.architecture.navigation>> illustrates a typical navigation
-between different top-level views of an application, and a main view with
-sub-views.
-
-[[figure.application.architecture.navigation]]
-.Navigation Between Views
-image::img/view-navigation-hi.png[]
-
-The [classname]#Navigator# described in
-<<dummy/../../../framework/advanced/advanced-navigator#advanced.navigator,"Navigating
-in an Application">> is a view manager that provides a flexible way to navigate
-between views and sub-views, while managing the URI fragment in the page URL to
-allow bookmarking, linking, and going back in browser history.
-
-Often Vaadin application views are part of something bigger. In such cases, you
-may need to integrate the Vaadin applications with the other website. You can
-use the embedding techniques described in
-<<dummy/../../../framework/advanced/advanced-embedding#advanced.embedding,"Embedding
-UIs in Web Pages">>.
-
-
-[[application.architecture.accessing]]
-== Accessing UI, Page, Session, and Service
-
-You can get the UI and the page to which a component is attached to with
-[methodname]#getUI()# and [methodname]#getPage()#.
-
-However, the values are [literal]#++null++# until the component is attached to
-the UI, and typically, when you need it in constructors, it is not. It is
-therefore preferable to access the current UI, page, session, and service
-objects from anywhere in the application using the static
-[methodname]#getCurrent()# methods in the respective [classname]#UI#,
-[classname]#Page#, [classname]#VaadinSession#, and [classname]#VaadinService#
-classes.
-
-
-[source, java]
-----
-// Set the default locale of the UI
-UI.getCurrent().setLocale(new Locale("en"));
-
-// Set the page title (window or tab caption)
-Page.getCurrent().setTitle("My Page");
-        
-// Set a session attribute
-VaadinSession.getCurrent().setAttribute("myattrib", "hello");
-
-// Access the HTTP service parameters
-File baseDir = VaadinService.getCurrent().getBaseDirectory();
-----
-
-You can get the page and the session also from a [classname]#UI# with
-[methodname]#getPage()# and [methodname]#getSession()# and the service from
-[classname]#VaadinSession# with [methodname]#getService()#.
-
-The static methods use the built-in ThreadLocal support in the classes.
-
-ifdef::web[]
- The pattern is described in
-<<dummy/../../../framework/advanced/advanced-global#advanced.global.threadlocal,"ThreadLocal
-Pattern">>.
-endif::web[]
-
-
-
-