Please help understand a fundamental notion of script
Hi, I'm reading the book of learning ActionScript 3.0 and have difficulties to understand some basics of programming due to my total lack of knowledge of prior programming.
For example now I am interested in this script of the book that traces a list of all the objects to display on the stage and their children:
function showChildren(dispObj:DisplayObject):void {
for (var i:int = 0; i< dispObj.numChildren; i++) {
var obj:DisplayObject = dispObj.getChildAt(i);
if (obj is DisplayObjectContainer) {
trace(obj.name, obj);
showChildren(obj);
} else {
trace(obj);
}
}
}
showChildren(stage);
I understand everything except one thing. When there is an object with children (DisplayObjectContainer), the function redraws the object but is not moving forward and calls itself to go anywhere this time analyze the first child of the object. And if the child also having children himself list will branch out until there is an object without children.
What I don't understand is how the function knows at this point how to return to the last object parent and continue to analyze her other children, if any.
For example when the function analysis the scene of a scene with the following content how function knows to continue the child0 analysis. For me, looking at the code, I would expect the service leave after listing [StaticText object]. I have hard time to understand what makes the function return to largeContainer and continues with its child0 and so on.
ROOT1 [object MainTimeline]
largeContainer [object largeContainer_1]
[object, form]
smallContainer [object smallContainer_2]
[object, form]
Child2 [object MovieClip]
[object, form]
[StaticText object]
child0 [object MovieClip]
[Shape object
Child1 [object MovieClip]
[object, form]
Having said all that the book about which isn't enough for me to understand this process:
... the function calls itself again. by passing the object currently
to inspect. This concept is called recursion. A function that calls itself can
seem redundant, but it can be very useful. In this case, each time that the function
is called, it receives a new display object to analyze, so the reports function
the content of this specific display object. The result is a complete walkthrough
to view all objects, regardless of the number of children each can have.
If you feel that you can explain this, please help. I'd greatly appreciate it.
It can be a little difficult to explain (I would not this place in the base category), but it helps to realize the programs have a good memory. Each call to the function showChildren has a list of things to go through and will go through the list from beginning to end. Is ago temporarily recursive calls to him, recursive calls are essentially the instances of this function and they have their own lists, and it can go further inland as required. If you want to consider that each list knows where it is and where to pick them up when he returned to... and the list hierarchy is not forgotten. While each subroster is complete, the proposed happening to his agenda.
Tags: Adobe Animate
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