Coding : Best Practice for Key Detection in Flash Lite 2

Tips using key Detection from luar Using Button

In Flash Lite 1.1, if we want to detect a key press (single press or continuous press), we need to attach the code to a button:

keyPress “”{
no += 1;
}

In Flash Lite 2, we can use back modern ActionScript, use Movie Clip or Object to do the key detection, for example:

Using Movie Clip as Key Listener

mc.onKeyDown = function(){
switch(Key.getCode()) {
case Key.UP :
no += 1;
break;
}
};
Key.addListener(mc);
Using Object as Key Listener
obj = new Object();
obj.onKeyDown = function(){
switch(Key.getCode()){
case Key.UP:
no += 1;
break;
}
}
Key.addListener(obj);

However, using key listener has a side effect, you cannot detect continuous key press (press the key without release). If you want to detect continuous key press, you need to use an

MovieClip.onEnterFrame:

mc.onEnterFrame = function(){
if(Key.isDown(Key.UP)){
no += 1;
}
};
//Key.addListener(obj);

By the way, I find the Flash Lite 2 emulator is even worse than Flash Lite 1.1 emulator because the latter one support pressing keyboard for testing (single press or continuous press), no need to use the mouse to click the phone button.

Here is the summary of the above testing:

Continuous Pressing Detecting Method	Press without Release in Handset	Press phone button without Release		Press the key in the PC keyboard without Release
		FL 1.1 Emulator	FL 2 Emulator	FL 1.1 Emulator	FL 2 Emulator
Button	Support (Slower)	Not Support	Not Support	Support	Not Support
Object	Not Support	N/A	Not Support	N/A	Not Support
Movie Clip	Not Support	N/A	Not Support	N/A	Not Support
Movie Clip onEnterFrame	Support (Faster)	N/A	Support	N/A	Not Support