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joaobarcia
joaobarcia

Control P5 - Multilist crash (how to remove items from multitlist)

in Contributed Library Questions  •  2 years ago  
Hi everyone,

I'm trying to delete multilist items. It's supposedly possible in the library's example -  ControlP5multiList.

Where in line 68 it says:
Copy code
    Copy code
    1.   //
    2.  uncomment the line below to remove a multilist item when clicked.
    3.   theEvent.controller().remove();

    If you try to run it, you get an error. Here is the whole example code:
    Copy code
    2. /**
    3.  * ControlP5 MultiList
    4.  * by andreas schlegel, 2009
    5.  */

    7. import controlP5.*;

    9. ControlP5 controlP5;
    10. MultiList l;

    12. void setup() {
    13.   size(1024,768);
    14.   frameRate(30);
    15.   controlP5 = new ControlP5(this);
    16.   
    17.   // add a multiList to controlP5.
    18.   // elements of the list have default dimensions
    19.   // here, a width of 100 and a height of 12
    20.   l = controlP5.addMultiList("myList",0,10,100,12);
    21.   
    22.   // create a multiListButton which we will use to
    23.   // add new buttons to the multilist
    24.   MultiListButton b;
    25.   b = l.add("level1",1);
    26.   
    27.   // add items to a sublist of button "level1"
    28.   b.add("level11",11).setLabel("level1 item1");
    29.   b.add("level12",12).setLabel("level1 item2");

    31.   b = l.add("level2",2);
    32.   
    33.   int cnt = 100;
    34.   
    35.   // add some more sublists.
    36.   for(int i=0;i<10;i++) {
    37.     MultiListButton c = b.add("level2"+(i+1),20+i+1);
    38.     c.setLabel("level2 item"+(i+1));
    39.     c.setColorBackground(color(64 + 18*i,0,0));
    40.     
    41.     if(i==4) {
    42.     // changing the width and the height of a button
    43.     // will be inherited by its sublists.
    44.     c.setWidth(100);
    45.     c.setHeight(20);
    46.     }
    47.     cnt++;
    48.     
    49.     if(i==4) {
    50.       for(int j=0;j<10;j++) {
    51.         cnt++;
    52.         MultiListButton d;
    53.         d = c.add("level2"+i+""+j,250+j+1);
    54.         d.setLabel("level2 item"+(i+1)+" "+"item"+(j+1));
    55.         d.setColorBackground(color(64 + 18*j,(64 + 18*j)/2,0));
    56.         d.setId(cnt);
    57.         d.setWidth(200);
    58.       }
    59.     }
    60.   }
    61.   
    62.   MultiListButton cc = (MultiListButton)controlP5.controller("level21");
    63.   cc.setHeight(40);
    64. }


    67. void controlEvent(ControlEvent theEvent) {
    68.   println(theEvent.controller().name()+" = "+theEvent.value());  
    69.   // uncomment the line below to remove a multilist item when clicked.
    70.   theEvent.controller().remove();
    71. }


    74. void draw() {
    75.   background(0);
    76. }

    78. void keyPressed() {
    79.   if(controlP5.controller("level23")!=null) {
    80.     println("removing multilist button level23.");
    81.     controlP5.controller("level23").remove();
    82.   }
    83. }

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