In PureMVC, where is the correct place to put Keyboard listener that controls a view?
I'm getting some PureMVC experience and I want to use keyboard commands to control my view. The rest of the application doesn't need to know about what this view is doing.
Should I put them directly in the view, or should they be some place else and have the view be notified using a Notif开发者_StackOverflow社区ication when a key is pressed?
Thanks!
As you said, you have two alternatives - to put some listeners in the view.mxml class, or to put the listeners in some general class.
1-st - this seems to be the normal approach, no further explanations needed, every programmer will do the same.
2-nd approach is more interesting. If you have many views, listening for keyboard events, you will start using something like
public class EnterButtonPressed extends SimpleCommand
{
function execute(...):void
{
//do something with the model, and then notify the view
}
}
but after adding more views which are supposed to listen for Enter
key your class will end up like that
public class EnterButtonPressed extends SimpleCommand {
function execute(...):void
{
switch(viewType)
{
case view1:
//do something with the model, and then notify view1
break;
case view2:
//do something with the model, and then notify view2
break;
case view3:
//do something with the model, and then notify view3
break;
case view4:
//do something with the model, and then notify view4
break;
...
}
}
Which seems awful if you listens to many keyboard events. But if you are familiar to design patterns you can use State Pattern.
It helped me a lot in my latest project, when I encountered many different view states listening for many events.
I also recommend you to take a look at Mate framework, it is like PureMVC + data binding + Flex events.
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