ControlP5 button...do one thing when pressed and another when released...

mubase

Hi all & seasons greetings from London. I have a problem with ControlP5 button. I want to be able to send a midi note on message when the button is pressed and a note off when it is released but at the moment all i can do is send a note on when I have pressed it and the note on message is sent when I let go of the button. I am using controlP5 on Processing for android bu the principle is the same... I just press the button with my finger instead of the mouse. So like I say, when I put my finger on the button it only sends the note on message when I let go of the button. Could anyone help me get it so when I PRESS the button, the note on is sent & when I let go of the button the note off message is sent? I am puzzled. Thanks all. Steve.

jagadishnallappa

Hi Steve,

It would be more helpful if you posted your code in here. :)

sojamo

Hi, you can use a callback, see example below:

import controlP5.*;
// uses processing 2.1 and controlp5 2.0.4
ControlP5 cp5;

void setup() {
  size(800, 400);

  cp5 = new ControlP5(this);
  cp5.addButton("my-button").setPosition(100,100).addCallback(  
  new CallbackListener() {
    public void controlEvent(CallbackEvent theEvent) {
      switch(theEvent.getAction()) {
        case(ControlP5.ACTION_PRESSED):
        println("send MIDI on press, note on.");
        break;
        case(ControlP5.ACTION_RELEASED):
        case(ControlP5.ACTION_RELEASEDOUTSIDE):
        println("send MIDI on release, note off.");
        break;
      }
    }
  }
  );

}

void draw() {
}