Page (central-repository 4.0.0-RC API)

java.lang.Object
- ej.navigation.Page

```
public abstract class Page
extends Object
```
The unit of navigation.
An application creates a screen by extending this class and implementing getContent(). A page is a lightweight factory for its visual content, not the content itself: the navigator asks the page to build its widget each time the page is about to be shown, so a fresh widget is produced on every navigation to the page.
A page is never constructed by the Navigator: the application's PageFactory builds it from the page's int key. Per-navigation data is supplied through the page's own constructor (constructor injection performed by the factory); the framework owns no parameter slot, and the public navigation API accepts keys, never page instances. The data itself may come from the navigation that triggered the build: Navigator.navigateTo(int, Object) and Navigator.replaceWith(int, Object) carry an argument to PageFactory.create(int, Object), which the factory injects. A page navigates through Navigator.getInstance().

Since:

0.2.0

Constructor Summary

Constructors
Constructor Description

Page()

Method Summary

All Methods Instance Methods Abstract Methods Concrete Methods
Modifier and Type	Method	Description
`protected abstract Widget`	`getContent()`	Creates the visual content of this page.
`protected void`	`onEntered()`	Notifies this page that it has become the active page.
`protected void`	`onExited()`	Notifies this page that it has ceased to be the active page.

Methods inherited from class java.lang.Object
clone, equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - Page
```
public Page()
```
- Method Detail
  - getContent
```
protected abstract Widget getContent()
```
    Creates the visual content of this page.
    Called by the Navigator when the page is about to be shown. A fresh widget is produced on each navigation to the page.
    
    Returns:
    
    the visual content of this page.
  - onEntered
```
protected void onEntered()
```
    Notifies this page that it has become the active page.
    Invoked immediately after the navigation operation, before the transition animation starts. A navigation requested from this callback is deferred and performed once the navigation in progress is finished. This default implementation does nothing.
  - onExited
```
protected void onExited()
```
    Notifies this page that it has ceased to be the active page.
    Invoked with the same timing as onEntered(). This default implementation does nothing.