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creationCompleteHandler is called once the component finishes the tasks of processing, measuring, layout, and drawing. At this point, we create the net connection and set event listeners for the messages to know when the connection is ready, as well as error messages due to security restrictions.

} else { g.drawImage(myMenu, DISP_WIDTH - 2, DISP_HEIGHT - 2, Graphics.BOTTOM|Graphics.RIGHT); } } // write "Next Board" when the user finishes a board: if(myGameOver) { myNext.setFrame(UNFOCUSED); myNext.setRefPixelPosition(DISP_WIDTH / 2, DISP_HEIGHT / 2); myNext.paint(g); } } /** * a simple utility to make the number of ticks look * like a time... */ public void setTimeSprites() { // we advance the display ticks once // for every twenty game ticks because // there are twenty frames per second: if(myGameTicks % 20 == 0) { // the number sprite is designed so that // the frame number corresponds to the // actual digit: myDisplayGameTicks++; int smallPart = myDisplayGameTicks % 60; myNumberSprites[3].setFrame(smallPart / 10); myNumberSprites[4].setFrame(smallPart % 10); int bigPart = myDisplayGameTicks / 60; myNumberSprites[0].setFrame((bigPart / 10) % 10); myNumberSprites[1].setFrame(bigPart % 10); } } //------------------------------------------------------// game movements and commands /** * update the display. */ void updateScreen() { if(! myMenuMode) { myGameTicks++; setTimeSprites(); } else { // in menu mode the game doesn't advance

protected function creationCompleteHandler(event:FlexEvent):void {

Before further illustrating the code on the client and server sides, the contract between the two sides needs to be defined. The contract in an Ajax application is the data that is sent between the client and the server. In the Infinite Data pattern implementation, there are two contracts: what the client sends as a structure to be processed by the server, and the result structures sent by the server and processed by the client. The state for the structure is stored in the HTML form input fields, which happen to be text fields, number1 and number2. When the appropriate button is clicked, the function SendData1 or SendData2 is called. What you should notice is that all of the identifiers are appended with a number to indicate whether the button represents the first task or the second task (or more appropriately called the first or second transaction identifier). When the results are generated using the transaction identifier, we know which span element, result1 or result2, the result structures are destined for. Let s say that the text field with the identifier number1 contains 20, and the button associated with the function SendData1 is clicked. The generated structure that is sent to the server is represented using the following XML: <Action> <TransactionIdentifier>1</TransactionIdentifier> <Number>20</Number> </Action>

connection = new NetConnection(); connection.addEventListener(NetStatusEvent.NET_STATUS, netStatusHandler); connection.addEventListener(SecurityErrorEvent.SECURITY_ERROR, securityErrorHandler); connection.connect(null); }

The netStatusHandler method will handle messages coming from the NetConnection object. We are using a switch to handle the different messages. We won t go into detail regarding these common messages now; the names of the event constants are self-explanatory. Later in this chapter we ll discuss what these messages mean.

// but the sparking animation behind the // selected item must advance: myStars.nextFrame(); } // paint the display: try { paint(getGraphics()); flushGraphics(CORNER_X, CORNER_Y, DISP_WIDTH, DISP_HEIGHT); } catch(Exception e) { myDungeon.errorMsg(e); } } /** * Respond to keystrokes. */ public void checkKeys() { if(! myGameOver) { // determine which moves the user would like to make: int keyState = getKeyStates(); if(myMenuMode) { menuAction(keyState); } else { int vertical = 0; int horizontal = 0; if((keyState & LEFT_PRESSED) != 0) { horizontal = -1; } if((keyState & RIGHT_PRESSED) != 0) { horizontal = 1; } if((keyState & UP_PRESSED) != 0) { vertical = -1; } if((keyState & DOWN_PRESSED) != 0) { // if the user presses the down key, // we put down or pick up a key object // or pick up the crown: myManager.putDownPickUp(); } // tell the manager to move the player // accordingly if possible: myManager.requestMove(horizontal, vertical); } } }