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<title>CallbackListener (Javadocs: controlP5)</title>
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<div class="subTitle">controlP5</div>
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<h2 title="Interface CallbackListener" class="title">Interface CallbackListener</h2>
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<pre>public interface <span class="strong">CallbackListener</span></pre>
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<div class="block"><p>
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Use a CallbackListener to listen for controller related actions such as pressed, released, etc.
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Callbacks cn be added via the ControlP5.addCallback() methods.
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</p></div>
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<dl><dt><span class="strong">See Also:</span></dt><dd><a href="../controlP5/ControlP5.html#addCallback(controlP5.CallbackListener)"><code>ControlP5.addCallback(CallbackListener)</code></a></dd><script type="text/javascript">
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<div id="test" class="toggleList"><dl><dt onclick="toggle(this);"><span>+</span>Example</dt><dd><code><pre>/**
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* ControlP5 Callback
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*
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* The following example demonstrates the CallbackListener and CallbackEvent.
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* Here additional information about each available slider will be show when
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* hovering the controller with the mouse. The info will fade out when leaving
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* the controller.
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*
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* When hovering a controller, the mouse pointer will change as well.
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*
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* find a list of public methods available for the CallbackEvent Controller
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* at the bottom of this sketch.
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*
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* by Andreas Schlegel, 2012
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* www.sojamo.de/libraries/controlp5
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*
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*/
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import controlP5.*;
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ControlP5 cp5;
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Slider s1, s2;
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Info info;
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CallbackListener cb;
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void setup() {
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size(800, 400);
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cp5 = new ControlP5(this);
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// create a new instance of class Info
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// info will be used to display a controller's information and
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// will fade in when a CallbackEvent is invoked.
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info = new Info();
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// add 2 sliders
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s1 = cp5.addSlider("hello")
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.setRange(0, 100)
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.setValue(50)
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.setPosition(40, 40)
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.setSize(100, 20);
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s2 = cp5.addSlider("world")
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.setRange(0, 100)
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.setValue(10)
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.setPosition(40, 70)
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.setSize(100, 20);
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// the following CallbackListener will listen to any controlP5
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// action such as enter, leave, pressed, released, releasedoutside, broadcast
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// see static variables starting with ACTION_ inside class controlP5.ControlP5Constants
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cb = new CallbackListener() {
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public void controlEvent(CallbackEvent theEvent) {
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switch(theEvent.getAction()) {
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case(ControlP5.ACTION_ENTER):
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info.n = 1;
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info.label.setText(theEvent.getController().getInfo());
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cursor(HAND);
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break;
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case(ControlP5.ACTION_LEAVE):
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case(ControlP5.ACTION_RELEASEDOUTSIDE):
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info.n = 0;
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cursor(ARROW);
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break;
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}
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}
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};
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// add the above callback to controlP5
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cp5.addCallback(cb);
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// add another callback to slider s1, callback event will only be invoked for this
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// particular controller.
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s1.addCallback(new CallbackListener() {
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public void controlEvent(CallbackEvent theEvent) {
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if (theEvent.getAction()==ControlP5.ACTION_BROADCAST) {
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s2.setValue(s2.getMax() - s1.getValue());
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}
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}
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}
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);
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}
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void draw() {
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background(0);
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info.update();
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}
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void controlEvent(ControlEvent theEvent) {
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println("Got a ControlEvent for "+theEvent.name()+" = "+theEvent.value());
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info.label.setText(theEvent.getController().getInfo());
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}
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void keyPressed() {
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// uncomment the line below to remove callback cb from controlP5
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// when a key is pressed.
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//controlP5.removeCallback(cb);
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}
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// controlEvent(CallbackEvent) is called whenever a callback
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// has been triggered. controlEvent(CallbackEvent) is detected by
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// controlP5 automatically.
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void controlEvent(CallbackEvent theEvent) {
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if (theEvent.getController().equals(s2)) {
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switch(theEvent.getAction()) {
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case(ControlP5.ACTION_ENTER):
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println("Action:ENTER");
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break;
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case(ControlP5.ACTION_LEAVE):
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println("Action:LEAVE");
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break;
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case(ControlP5.ACTION_PRESSED):
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println("Action:PRESSED");
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break;
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case(ControlP5.ACTION_RELEASED):
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println("Action:RELEASED");
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break;
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case(ControlP5.ACTION_RELEASEDOUTSIDE):
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println("Action:RELEASED OUTSIDE");
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break;
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case(ControlP5.ACTION_BROADCAST):
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println("Action:BROADCAST");
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break;
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}
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}
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}
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class Info {
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float a;
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float n = 0;
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String txt = "";
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Textarea label;
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Info() {
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label = cp5.addTextarea("Hello\nWorld")
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.setSize(200,200)
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.setPosition(300,40)
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.setColor(color(255))
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.setColorBackground(color(100,0))
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.setLineHeight(12);
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}
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void update() {
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a += (n-a)*0.1;
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label.setColorBackground(color(100,255*a));
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}
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}
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/*
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a list of all methods available for the CallbackEvent Controller
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use ControlP5.printPublicMethodsFor(CallbackEvent.class);
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to print the following list into the console.
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You can find further details about class CallbackEvent in the javadoc.
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Format:
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ClassName : returnType methodName(parameter type)
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controlP5.CallbackEvent : Controller getController()
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controlP5.CallbackEvent : int getAction()
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java.lang.Object : String toString()
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java.lang.Object : boolean equals(Object)
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*/
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</pre></code></dd></dl></div></dl>
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<h3>Method Summary</h3>
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<table class="overviewSummary" border="0" cellpadding="3" cellspacing="0" summary="Method Summary table, listing methods, and an explanation">
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<caption><span>Methods</span><span class="tabEnd"> </span></caption>
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<tr>
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<th class="colFirst" scope="col">Modifier and Type</th>
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<th class="colLast" scope="col">Method and Description</th>
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<td class="colFirst"><code>void</code></td>
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<td class="colLast"><code><strong><a href="../controlP5/CallbackListener.html#controlEvent(controlP5.CallbackEvent)">controlEvent</a></strong>(<a href="../controlP5/CallbackEvent.html" title="class in controlP5">CallbackEvent</a> theEvent)</code> </td>
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<a name="controlEvent(controlP5.CallbackEvent)">
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<h4>controlEvent</h4>
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<pre>void controlEvent(<a href="../controlP5/CallbackEvent.html" title="class in controlP5">CallbackEvent</a> theEvent)</pre>
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</div>
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<div>
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<ul class="subNavList">
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<li>Summary: </li>
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<li>Nested | </li>
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<li>Field | </li>
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<li>Constr | </li>
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<li><a href="#method_summary">Method</a></li>
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</ul>
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<ul class="subNavList">
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<li>Detail: </li>
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<li>Field | </li>
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<li>Constr | </li>
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<li><a href="#method_detail">Method</a></li>
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</ul>
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<a name="skip-navbar_bottom">
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<p class="legalCopy"><small>processing library controlP5 by Andreas Schlegel. (c) 2006-2014</small></p>
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</body>
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</html>
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