Processing IDE - Double Click on Buttons for Different Conditions

There are 4 areas on my LED Ring and I made 4 buttons for choosing them. I want to be able to use these areas for different combinations.

So my aim is:

One click on the button: Selected area is active.

Double click on on the button: Selected area is deactive.

I know there is a function called mousePressed() but I couldn't implement it to my buttons with a double-click condition.

Here is the piece of my code of from processing:

  Group AreaGroup = cp5.addGroup("AREAS")
    .setPosition(290,50)
    .setWidth(150)
    .setHeight(30)
    .setFont(font2)
    .moveTo(SetupGroup);
    background(0);
    noStroke();
    ;
    
    cp5.addButton("AREA_1")  // The button
    .setPosition(-15,10)     // x and y relative to the group
    .setSize(90, 50)       // (width, height)
    .setFont(font)
    .moveTo(AreaGroup);   // add it to the group 
    ;     
  
  
    cp5.addButton("AREA_2")  // The button
    .setPosition(90,10)    // x and y relative to the group
    .setSize(90, 50)       // (width, height)
    .setFont(font) 
    .moveTo(AreaGroup);   // add it to the group  
  ; 
  
    cp5.addButton("AREA_3")  // The button
    .setPosition(-15,80)     // x and y relative to the group
    .setSize(90, 50)       // (width, height)
    .setFont(font)
    .moveTo(AreaGroup);   // add it to the group 
    ;     
  
  
    cp5.addButton("AREA_4")  // The button
    .setPosition(90,80)    // x and y relative to the group
    .setSize(90, 50)       // (width, height)
    .setFont(font) 
    .moveTo(AreaGroup);   // add it to the group  
  ;
  
     cp5.addButton("ALL")  // The button
    .setPosition(190,45)    // x and y relative to the group
    .setSize(90, 50)       // (width, height)
    .setFont(font) 
    .moveTo(AreaGroup);   // add it to the group  
  ; 

void AREA_1(){
  println("AREA_1");
  if (port != null) port.write("a\n");
}

void AREA_2(){
  println("AREA_2");
  if (port != null) port.write("b\n");
}

void AREA_3(){
  println("AREA_3");
  if (port != null) port.write("c\n");
}

void AREA_4(){
  println("AREA_4");
  if (port != null) port.write("d\n");
}

void ALL(){
  println("ALL");
  if (port != null) port.write("t\n");
}

And here is the code pieces from Arduino

switch(state){

        case 'p':
        Serial.println(F("ex."));
        break;

        case 's':
        Serial.println(F("Start"));
          start = true;
        break;

        case '1':
        Serial.println(F("Switching to ring #1"));
          updateRing1 = true;
          updateRing2 = false;
        break;
        
        case '2':
          Serial.println(F("Switching to ring #2"));
          updateRing1 = false;
          updateRing2 = true;
        break;
        
        case 'a':
          Serial.println(F("Area1"));
          Area1 = true;
        break;  

        case 'b':
          Serial.println(F("Area2"));
          Area2 = true;
        break;

        case 'c':
          Serial.println(F("Area3"));
          Area3 = true;
        break;

        case 'd':
          Serial.println(F("Area4"));
          Area4 = true;
        break;

         case 't':
          Serial.println(F("All the leds are choosen"));
          total = true;
          Area1 = false;
          Area2 = false;
          Area3 = false;
          Area4 = false;
        break; 

If you intend to detect double clicks, start a millis() timer at the first click, then take a second millis() reading after the second click and compare it to a time threshold to detect it. You will need a couple of timing variables, one for the current value and another one for storing the previous one.

What did you try exactly with the mousePressed() function? It would be nice to know what you have tried and where you failed in order to help you