ControlP5 Range: automatic callback

Contributed Library Questions

maleo

ControlP5 Range: automatic callback

in Contributed Library Questions • 7 months ago

hey,

how to use ControlP5's "automatic callback" mechanism for the Range Controller?

Say I have a Range Controller named "rangeController".

a float array with the same name won't get updated:

float[] rangeController = new float[2];

a method with a float array argument won't get called:

void rangeController(float[] theArray) ...

a method without arguments *does* get called automatically, but then I'd have to manually get the current values of the Range Controller

void rangeController() ...

Replies(2)

andreas.s..

Re: ControlP5 Range: automatic callback

7 months ago

Hi, this feature is missing for the Range controller, by default you would need to go through using the controlEvent method which is used in the ControlP5Range example. But to automatically detect and update a field use the code in the example below, here the range controller automatically updates the float[] variable rangeController after calling and applying the custom addCallbackForRange() function.

import controlP5.*;
import java.lang.reflect.*;
ControlP5 cp5;
Range range;
float[] rangeController = new float[2];
void setup() {
size(700, 400);
cp5 = new ControlP5(this);
range = cp5.addRange("rangeController")
// disable broadcasting since setRange and setRangeValues will trigger an event
.setBroadcast(false)
.setPosition(50, 50)
.setSize(400, 40)
.setHandleSize(20)
.setRange(0, 255)
.setRangeValues(50, 100)
// after the initialization we turn broadcast back on again
.setBroadcast(true)
;
addCallbackForRange( range , this );
noStroke();
}
/* add automatic field detection for a range controller */
void addCallbackForRange(final Range theRange, final Object theParent) {
theRange.addCallback(new CallbackListener() {
public void controlEvent(CallbackEvent theEvent) {
if (theEvent.getAction() == ControlP5.ACTION_BROADCAST) {
try {
Field f = theParent.getClass().getDeclaredField( theEvent.getController().getName() );
f.set(theParent , theEvent.getController().getArrayValue() );
}
catch ( Exception e ) {
println(e);
}
}
}
}
);
}
void draw() {
background(rangeController[0]);
fill(rangeController[1]);
rect(0, 0, width, height/2);
}

andreas schlegel, http://www.sojamo.de

maleo

Re: ControlP5 Range: automatic callback

7 months ago

thanks!

So, I was wondering, if the examples are intended as a kind of documentation? i.e. do the examples showcase all (most?) of the features of the respective controls?

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