Delete TextLabels during runtime (controlP5)

tomrbland

Delete TextLabels during runtime (controlP5)

in Contributed Library Questions • 6 months ago

I hope this is in the right place, then again this one might be a general programming mistake rather than asking how to use controlP5..

I have a box which is populated with data in the form of textlabels. The number of boxes needs to change as and when new devices come online or go offline.

I currently start by declaring in my setup that updateboxes=1;

Then this is in Draw:

if(updateboxes=1){
while(i<numberofboxes){
arrayofboxes[i]=new box(positioninginfo,i); //i gives each label inside each box an id relating to its box.
}
updateboxes=0;
}

When the number of boxes gets bigger all is well (except for the error that says "controller with name 'blaar' already exists" but that's because I'm re-drawing all of them everytime and because I can't work out how to delete them I get that warning).

Now, when I reduce the number of boxes the labels stay there. Because (I think) there's no way of deleting an instance in Java.

Any ideas?

Replies(2)

Chrisir

Re: Delete TextLabels during runtime (controlP5)

6 months ago

Hello!

Well, you should at startup do the part

arrayofboxes[i]=new box(positioninginfo,i);

in (or called by) setup().

Instead of an array you could use an ArrayList, because you can use "remove" then:
http://www.processing.org/reference/ArrayList.html
Link

Do you get a signal when a new device come online?
Because if they have a unique names you could look at hashmap?
http://www.processing.org/reference/HashMap.html

When you get a signal a new device comes online / offline:

You would use remove in the arraylist and then remove the control too.
When you add an item to the arraylist and then add the control too.

Greetings, Chrisir