Make It Simple: August 2010

1. updateComplete

dispatched after a component has gone through its validation process, called after commitProperties(),measure(), updateDisplayList()

2. The preinitialize event occurs too early in the component life cycle for most initialization activities. It is useful, however, in the rare situations where you must set the properties on a parent before the children are created.

3.To configure a component before Flex has determined its visual appearance, use the initialize event. For example, use this for setting properties that affect its appearance, height, or width.

4. Use the creationComplete event for actions that rely on accurate values for the component's size or position when the component is created. If you use this event to perform an action that changes the visual appearance of the component, Flex must recalculate its layout, which adds unnecessary processing overhead to your application.

5. Use the updateCompleteevent for actions that must be performed each time a component's characteristics change, not just when the component is created.

6. FileModeConstants

Read - read file
Write - write file
Update -
Append - write to the end of an existing file

7. Two methods of File class to write simpler code without setting up eventlisteners

copyTo()
getDirectoryListing()
both are synchronous versions

8. Some methods in file class

File.copyTo() and File.copyToAsync()
File.deleteDirectory() and File.deleteDirectoryAsync()
File.deleteFile() and File.deleteFileAsync()
File.getDirectoryListing() and File.getDirectoryListingAsync()
File.moveTo() and File.moveToAsync()
File.moveToTrash() and File.moveToTrashAsync()

9. DataService object methods

DataService.fill()
DataService.commit()
DataService.getItem()
DataService.createItem()
DataService.releaseItem()
DataService.releaseCollection()
DataService.disconnect()
DataService.setCredentials()
DataService.logout()
DataService.release()
DataService.merge()
DataService.revertChanges()

10. drag-and-drop api transfer formats

Bitmaps (png,jpeg,gif..)
Files
HTML-formatted text
Text
URLs
Serialized objects
Object references(only valid within the origination application)

11. Flex containers with absolute layout

Canvas always uses absolute positioning
Application and Panel controls - specify layout property "absolute"

12. once you apply transition to a component, you cannot apply an effect - False

transition - one or more effects grouped together to play when view state change occurs

13. Components used to connect to a REST-style service API

HTTPService - HTTP GET or POST
Webservice - soap web services
RemoteObject - AMF remoting services
HTTPService is also known as REST-style webservice
REST - Representational State Transfer

14. how to find the value of the last inserted row identifier from the SQLResult after an insert statement is executed

lastInsertRowID will contain the identifier for the last inserted row

15. NativeDragOptions class properties allow initiating and target objects to cooperate in a drag-and-drop exchange

allowCopy
allowLink
allowMove

16. Access Modifiers:

internal (default) - visible to references inside the same package
private - visible to references in the same class
protected - visible to references in the same class and derived classes
public - visible to references everywhere

static - a property belongs to the class
static properties not inherited (code will cause run-time error)

17. Methods for using regular expressions with strings

exec() - returns an array with matching substring
test() - returns boolean

18. String class methods

match()
replace()
search()
split()

19. Repeater (properties)

currentItem - to reference the currently processing data item
currentIndex - counter that refers to the item's order in the data set

20. Metadata tags donot compile into executable code, but provide information to control how portions of your code get compiled. (True)

They are used to provide information to the adobe flex compiler

21. CSS selector types

class selector
type selector
descendant selector
id selector
pseudo selector (viewstates)

22. Methods used to change between viewstates in your app

using currentState property (or)
by calling the setCurrentState() method of UIComponent class

Creating root menu object


var root:NativeMenu = new NativeMenu();

Setting the application menu


NativeApplication.nativeApplication.menu = root;

Setting a window menu


nativeWindowObject.menu = root;

Setting a context menu on an interactive object


interactiveObject.contextMenu = root;

setting a dock icon menu


DockIcon(NativeApplication.nativeApplication.icon).menu = root;

Setting a system tray icon menu


SystemTrayIcon(NativeApplication.nativeApplication.icon).menu = root;

Displaying a menu as a pop-up


root.display(stage,x,y)

Creating a submenu


var editorMenuItem:NativeMenuItem = root.addSubMenu(new NativeMenu(),"Edit");

(or)


var editMenuItem:NativeMenuItem = root.addItem("Edit",false);
editMenuItem.subMenu = new NativeMenu();

Create a menu command


var copy:NativeMenuItem = new NativeMenuItem("Copy",false);
copy.addEventListener(Event.SELECT,onCopyCommand);
editMenu.addItem(copy);

Creating a menu separator line


var separatorA:NativeMenuItem = new NativeMenuItem("A",true);
editMenu.addItem(separatorA);

23. In a class that implements an interface, implemented methods must do the following:

Use the public access control identifier.
Use the same name as the interface method.
Have the same number of parameters, each with data types that match the interface method parameter data types.
Use the same return type.

Note: The method declaration inside an interface definition cannot have any access control specifiers (if it contains then code will cause a compile-time error)

Create new Roo Project
persistence setup --provider HIBERNATE --database H2_IN_MEMORY
flex setup
Add the required entities and fields
Now go to command prompt and run mvn eclipse:eclipse
ex: C:\Documents and Settings\suresh.paleti\Documents\workspace-sts-2.3.3.M2\rooexample>mvn eclipse: eclipse
Now open eclipse and refresh the project
In the src/main/webapp/ you should see the swf files if you are not able to see them then clean the project (click on Project > clean...), now you should see the swf files.
Once you are done go to command prompt and run mvn clean install
ex: C:\Documents and Settings\suresh.paleti\Documents\workspace-sts-2.3.3.M2\rooexample>mvn clean install
Now in the target folder you should be able to see the war file. Copy this war and deploy in tomcat webapps folder and start the server.
Finally go to flash builder perspective, right click on the project and run as > Web Application. That's it you should be able to see the flex application running.

Note: ctrl + R (popup to type roo command)

Make It Simple

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Useful Links

Useful Links for Flex

Flex Certification

Problems faced to make Roo project to work using STS