org.gwtiger.client.screen
Class BaseEntryScreen

java.lang.Object
  org.gwtiger.client.screen.BaseEntryScreen

All Implemented Interfaces:

com.google.gwt.core.client.EntryPoint, com.google.gwt.user.client.HistoryListener, java.util.EventListener

Direct Known Subclasses:

MyApp

public abstract class BaseEntryScreen
extends java.lang.Object
implements com.google.gwt.core.client.EntryPoint, com.google.gwt.user.client.HistoryListener

The main class of your GWT project should inherit from BaseEntryScreen instead of implementing EntryPoint

This class provides lazy loading functionality and some utility functions

Author:

Aditya Kapur

Field Summary

static java.lang.String

historyPrefix

Constructor Summary

BaseEntryScreen()

Method Summary

void	addHistorySupport() Call this method from onModuleLoad() to add support for history.
void	changeHistory(java.lang.String historyToken)
BaseScreen	getScreen(int index)
void	onHistoryChanged(java.lang.String historyToken)
void	reset_screens() This is to clear all the screens from memory
void	showLoading(boolean visible) This method allows you to show the "Loading..." message on the screen
void	showScreen(int index) This method opens the screen identified by the index If the screen has not been loaded earlier, it is initialized
void	showScreen(int index, java.lang.Object object) This method opens the screen identified by the index If the screen has not been loaded earlier, it is initialized
void	showScreen(int index, java.lang.String objectType, java.lang.Long objectId) This method opens the screen identified by the index If the screen has not been loaded earlier, it is initialized
void	showScreen(int index, java.lang.String objectType, java.lang.String objectId) This method opens the screen identified by the index If the screen has not been loaded earlier, it is initialized

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface com.google.gwt.core.client.EntryPoint

onModuleLoad

Field Detail

historyPrefix

public static java.lang.String historyPrefix

Constructor Detail

BaseEntryScreen

public BaseEntryScreen()

Method Detail

addHistorySupport

public void addHistorySupport()

Call this method from onModuleLoad() to add support for history. Nothing else needs to be done

changeHistory

public void changeHistory(java.lang.String historyToken)

onHistoryChanged

public void onHistoryChanged(java.lang.String historyToken)

Specified by:

onHistoryChanged in interface com.google.gwt.user.client.HistoryListener

showLoading

public void showLoading(boolean visible)

This method allows you to show the "Loading..." message on the screen

Parameters:

visible - if true then the message is displayed and is hidden when false

showScreen

public void showScreen(int index)

This method opens the screen identified by the index
If the screen has not been loaded earlier, it is initialized

Parameters:

index - ID of the screen to be loaded

See Also:

load

showScreen

public void showScreen(int index,
                       java.lang.Object object)

This method opens the screen identified by the index
If the screen has not been loaded earlier, it is initialized

Parameters:

index - ID of the screen to be loaded

See Also:

load

showScreen

public void showScreen(int index,
                       java.lang.String objectType,
                       java.lang.Long objectId)

This method opens the screen identified by the index
If the screen has not been loaded earlier, it is initialized

 showScreen(CUSTOMER_SCREEN, "CUSTOMER", CustId);
 

Where CUSTOMER_SCREEN is a static int variable identifying the screen "CUSTOMER" is a parameter passed to the screen to help it identify what objectID that is being passed CustId is a variable that could potentially be the primary key of the customer table. The expected behavior is that the screen displayed and the customer is loaded

Parameters:

index - ID of the screen to be loaded.

objectType - This is a parameter that is passed to the screen that is being loaded.

objectId - This is a parameter passed to the screen.

See Also:

load

showScreen

public void showScreen(int index,
                       java.lang.String objectType,
                       java.lang.String objectId)

This method opens the screen identified by the index
If the screen has not been loaded earlier, it is initialized

 showScreen(CUSTOMER_SCREEN, "CUSTOMER", CustId);
 

Where CUSTOMER_SCREEN is a static int variable identifying the screen "CUSTOMER" is a parameter passed to the screen to help it identify what objectID that is being passed CustId is a variable that could potentially be the primary key of the customer table. In this method the ID is a string that is converted to a Long variable. The expected behavior is that the screen displayed and the customer is loaded

Parameters:

index - ID of the screen to be loaded.

objectType - This is a parameter that is passed to the screen that is being loaded.

objectId - This is a parameter passed to the screen.

getScreen

public BaseScreen getScreen(int index)

reset_screens

public void reset_screens()

This is to clear all the screens from memory