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public abstract class ParentBase implements Parent { private List _commands = new LinkedList(); public void addCommand( Command cmd) { _commands.add( cmd); } public Iterator getCommands() { return _commands.iterator(); } public void clearAllCommands() { _commands.clear(); } The code excerpt shows that the individual local client instances (Command) are managed in a LinkedList. To add a local client, the method addCommand is used. To remove all local client instances, the method clearAllCommands is used. Because we are coding in a managed code environment, removing the Command instances does not equate to deleting them. They will be deleted when there are no references to the local client instances. This is important because when the local client instances are cleared, the threads referencing the local client instances will still be executing. It would be very inappropriate to have to wait until all of the old local client instances have finished executing, or to stop the execution in midstream. The remaining functionality implemented by ParentBase relates to executing the local clients through the Command interface. The execution of the local clients is on a per thread basis. Each local client is allocated a thread so that the individual executions can occur concurrently. Some readers may comment that spinning off an individual thread in a heavily multithreaded environment is inefficient. Granted, the statement is true, but consider the context, where the

The Composite UI Application Block allows for the state of an application to be kept, even if the application is closed by the user. The WorkItem class contains a State property, which holds a loose collection of name-value pairs. When the State property is changed, the StateChanged event is fired. This gives the application the ability to respond to state changes, such as persisting the state to a file in case of an unexpected application failure. The state of an application can be kept even if the application is shut down by the user. This is handled by the State Persistence service. The State Persistence service provides an interface called IStatePersistenceService, which defines the interface for performing state persistence duties. Also included with the Composite UI Application Block are two state persistence implementations: the FileStatePersistenceService class and the IsolatedStorageStatePersistenceService class. Both of these classes provide similar functionality in storing the state of an application to a file and retrieving it.

//Give the tile a random velocity tileModel.vx = (Math.random() * _speedLimit) - _speedLimit / 2; tileModel.vy = (Math.random() * _speedLimit) - _speedLimit / 2; //Push the tile into the tiles array _tiles.push(tileModel); } } } private function enterFrameHandler(event:Event):void { //Clear the bitmap from the previous frame so that it's //blank when you add the new particle positions _stageBitmapData.fillRect(_stageBitmapData.rect, 0); //Move the tiles by working out their new positions based //on the velocity's and positions of the tileModels for(var j:int = 0; j < _tiles.length; j++) { //1. Update the models //Update the position and velocity of the tileModels _tiles[j].x += _tiles[j].vx; _tiles[j].y += _tiles[j].vy; //Check stage boundaries //Check left and right if(_tiles[j].x + _tileSize > _stageBitmapData.width || _tiles[j].x < 0) { _tiles[j].vx = -_tiles[j].vx; } //Check top and bottom if(_tiles[j].y + _tileSize > _stageBitmapData.height || _tiles[j].y < 0) { _tiles[j].vy = -_tiles[j].vy; } //2. Create the views: display the tiles on the stage bitmap //Find the tileModel's corresponding tile in the tileMap's //BitmapData and plot it to a new position in the containing stage bitmap. //This is the tile's "view"

Almost all UIs use common elements throughout an application. In order to simplify the use and interaction of these common elements, the Composite UI Application Block supports the development of user interface components called UIElements. UIElements include menus, status bars, progress bars, toolbars, notification tray icons, and so on. Typically, the shell developer will create the UIElement component, and the module developers will use it. To handle the manipulation of a UIElement, a specialized adapter called the IUIElementAdapter must be defined. The IUIElementAdapter contains the members that a UIElement adapter should support. The IUIElementAdapter contains two methods that must be implemented: the Add and Remove methods. An implementation class named UIElementAdapter provides generic methods for satisfying this interface. Currently, the Composite UI Application Block contains two UIElement adapters: * ToolStripItemOwnerCollectionUIAdapter: Provides an adapter where new System. Windows.Forms ToolStripItems will be added to an existing ToolStripItems collection. * ToolStripItemCollectionUIAdapter: Provides an adapter for wrapping the System. Windows.Forms.ToolStripCollection class for use by an instance of the IUIElementAdapter interface. UIExtensionSites are a collection of elements contained within a WorkItem class that allow you to access and manage UIElements through their registered adapters. You must specify the name of the site (typically a URI string) when registering adapters. Other components and code will use the site name to reference the UIElements contained within a UIExtensionSite.