public function removeListener (listener : Object) : Void

{

for (var i : Number = 0; i < listeners.length; i ++)

{

if (listeners [i] == listener) listeners.splice (i, 1);

}

}

The removeListener method does the exact opposite of your addListener function. It too takes an Object as its argument, but it removes the Object if it finds it in the listeners array. Flash does not have a remove method for arrays, but you can simulate a remove function by using the splice method:

listeners.splice (i, 1);

---

public function addCombination (name : String, keyCode1 : Number, keyCode2 : Number) : Void

{

key_combinations.push (arguments);

}

This method takes in the three arguments that make up your multiple key combination. Notice how the arguments are being added to the key_combinations array. Instead of pushing them into the array one variable at a time, the keyword 'arguments' is passed in instead.

The arguments keyword captures all of the data passed into your method. You can use this approach when you can't accurately predict the amount of arguments that you might get passed into a method. For example, you may have key combinations that require more than two keyboard presses such as Ctrl + Shift + N, for example.

The final format of the arguments will be (String, Number, Number). When you pass in, for example, Key.Control, the ASCII-code equivalent is passed in instead. A sample trace of the arguments path for Ctrl + Y would be:

redo,17,89

Let's now take a look at how your key_combinations actually stores your data. If you were to add Ctrl + Z and Ctrl + N, as your combinations, you would use the following code in your FLA:

keyDet.addCombination("undo", Key.CONTROL, 90);

keyDet.addCombination("redo", Key.CONTROL, 89);

Each of the arguments you made to the addCombination method is stored in the key_combinations array as a nested array item. Your array basically resembles the following structure:

[[undo,17,90],[redo,17,89],[new,17,85]]

---

private function invokeOnKeyCombination (combo_name : String ) : Void

{

for (var i : Number = 0; i < listeners.length; i ++)

{

listeners [i].onKeyCombination (combo_name);

}

}

This function takes in the name of your combo, combo_name, as the argument. It then cycles through all of your listener objects and passes the combo_name argument to the onKeyCombination method of each listener object. If you recall, the onKeyCombination method is defined in your FLA.

More code explanations on the next page!