Hi all, this is a question for the more experienced script programmers. I was looking at ways to optimize my code and I found that it would be handy if I could assign custom fields to item objects, because then I would be able to store calculated values on the item and if be able to use them in functions to which I would only have to pass the item as argument and not also the calculated value. Actually I wouldn’t even have to pass the items as an argument to the functions because I could make the function run on the item.

After some searching I found this: http://stackoverflow.com/questions/1646698/what-is-the-new-keyword-in-javascript

I implemented this in a small example script:

dummy = LL.getCurrentDesktop().addShortcut(“dummy”,new Intent(),0,0);

// OLD WAY

/*

function displayCenter(it, center){

it.setLabel(center[0]+”,”+center[1]);

}

function moveToCenter(it, center){

it.setPosition(center[0], center[1]);

}

function center(item){

var r=item.getRotation()*Math.PI/180;

var sin=Math.abs(Math.sin(r));

var cos=Math.abs(Math.cos(r));

var w=item.getWidth()*item.getScaleX();

var h=item.getHeight()*item.getScaleY();

return[item.getPositionX()+(w*cos+h*sin)*0.5,item.getPositionY()+(h*cos+w*sin)*0.5];

}

var center = center(dummy);

displayCenter(dummy, center);

moveToCenter(dummy, center);

*/

//NEW WAY:

myItem = function(){

this.getCenter = function(){

if(this.center==null){

alert(“test”)

var r=this.getRotation()*Math.PI/180;

var sin=Math.abs(Math.sin(r));

var cos=Math.abs(Math.cos(r));

var w=this.getWidth()*this.getScaleX();

var h=this.getHeight()*this.getScaleY();

var center = [this.getPositionX()+(w*cos+h*sin)*0.5,this.getPositionY()+(h*cos+w*sin)*0.5]

this.center = center;

}

return this.center;

};

this.displayCenter = function(){

this.setLabel(this.getCenter()[0]+”, “+this.getCenter()[1]);

};

this.moveToCenter = function(){

this.setPosition(this.getCenter()[0], this.getCenter()[1]);

};

};

myItem.prototype = dummy;

myDummy = new myItem();

myDummy.displayCenter();

myDummy.moveToCenter();

myDummy.setSize(288, myDummy.getHeight()) //ALSO STILL WORKS BOTH WORK ON SAME OBJECT DESPITE THAT I DIDN’T DEFINE A getPositionX() IN myItem 😀

As you can see this enables me to do what I explained herebove, but I haven’t seen anyone do it before, so I am wondering if there is anything bad happening here or I actually found something cool and useful.

Please tell me what you think in the comments.

Thanks for reading 🙂

cdfa

http://stackoverflow.com/questions/1646698/what-is-the-new-keyword-in-javascript

]]>

Hi all, this is a question for the more experienced users: I was looking at ways to optimize my code and I found that I would be handy if I could assign custom fields to item objects, but LL doesn’t allow me to. The I found this: http://stackoverflow.com/questions/1646698/what-is-the-new-keyword-in-javascript

I implemented this in a small example script:

dummy = LL.getCurrentDesktop().addShortcut(“dummy”,new Intent(),0,0);

myItem = function(){

this.getCenter = function(){

var r=this.getRotation()*Math.PI/180;

var sin=Math.abs(Math.sin(r));

var cos=Math.abs(Math.cos(r));

var w=this.getWidth()*this.getScaleX();

var h=this.getHeight()*this.getScaleY();

return[this.getPositionX()+(w*cos+h*sin)*0.5,this.getPositionY()+(h*cos+w*sin)*0.5];

};

};

myItem.prototype = dummy;

myDummy = new myItem();

alert(myDummy.getCenter()[0])

alert(myDummy.getPositionX()) // BOTH WORK ON SAME OBJECT AND DIDN’T DEFINE A getPositionX() IN myItem 😀

I never seen anyone use this, so I was wondering if there is anything that makes this very inefficient or I actually discovered something pretty cool.

Thanks for reading 🙂

Colin

http://stackoverflow.com/questions/1646698/what-is-the-new-keyword-in-javascript

]]>

Quick question: would it be more efficient for a script that is executed lots of times per second to get data with script.getTag() each time or to only do this once, save it to this.valueName and get it from that each time. (The data doesn’t change between script executions, and the tag would only be set once)

Might sound kinda stupid, but just to be sure…

]]>

Does anybody know a way to use a custom xml layout file for the childView in a expandable list? Might be a bit of a far out question, but I know there are some really smart guys here.

]]>

This might be suggested before, or there might already be a known way of doing it, but is there a way to get all the tags associated with a script? If not, it would be nice to see such method in the scripting api :).

]]>

New script if you want to have multiple things happen on the same event. Does require some scripting knowlegde to use though. If there are any bugs please let me know, but it should work fairly well. If you have any suggestions on how to improve this let me know too! Import it here: http://www.pierrox.net/android/applications/lightning_launcher/wiki/doku.php?id=script_event_bus

http://www.pierrox.net/android/applications/lightning_launcher/wiki/doku.php?id=script_event_bus

]]>