ControlP5 Dropdown setValue

phillarby

in Contributed Library Questions • 1 year ago

I'm using the ControlP5 library and am struggling to set the selected value of the dropdown programatically? I have failed to find anything in the documentation, but this seems like it should be possible.

Basically, I am using a dropdown to select from a list of predefined states for my program. When the program first starts, I want the dropdown to show the intial state. All the other controls I am using have a setValue or equivalent that I can use but seemingly not the dropdown list which defaults to having nothing selected.

Thanks
Phil

Replies(2)

bustup

Re: ControlP5 Dropdown setValue

1 year ago

This is not yet fixed in the latest release of ControlP5, I had to add it myself and recompile the library.

But here's a quick solution:

public class MyDropdownList extends MyListBox {
public MyDropdownList(ControlP5 controlP5, ControlGroup cb, String name, int x, int y, int w, int h) {
super(controlP5, cb, name, x, y, w, h);
}
public void setIndex(float theValue) {
for (int i = 0; i < items.size(); i++) {
MyListBoxItem l = items.get(i);
if ((l.getValue() == theValue)) {
_myValue = l.getValue();
setLabel(l.getName());
//controlP5.controlbroadcaster().broadcast(new ControlEvent(this), ControlP5Constants.FLOAT);
break;
}
}
}
}
public class MyListBox extends ListBox {
private ControlP5 controlP5;
protected List<MyListBoxItem> items;
public MyListBox(ControlP5 controlP5, ControlGroup cb, String name, int x, int y, int w, int h) {
super(controlP5, cb, name, x, y, w, h);
this.controlP5 = controlP5;
items = new ArrayList<MyListBoxItem>();
}
@Override
public MyListBoxItem addItem(String theName, int theValue) {
MyListBoxItem lbi = new MyListBoxItem(this, theName, theValue);
items.add(lbi);
addListButton(1, theName);
return lbi;
}
@Override
public MyListBoxItem item(int theIndex) {
return ((MyListBoxItem) items.get(theIndex));
}
@Override
public MyListBoxItem item(String theItemName) {
for (int i = items.size() - 1; i >= 0; i--) {
if ((items.get(i)).getName().equals(theItemName)) {
return items.get(i);
}
}
return null;
}
protected void addListButton(int theNum, String name) {
for (int i = 0; (i < theNum) && (buttons.size() < maxButtons); i++) {
int index = buttons.size();
MyButton b = new MyButton(controlP5, (ControllerGroup) this, name, index, 0, index * (_myItemHeight + spacing), _myWidth, _myItemHeight, false);
b.setMoveable(false);
add(b);
controlP5.register(b);
b.setBroadcast(false);
b.addListener(this);
buttons.add(b);
}
//updateScroll();
}
}
public class MyListBoxItem extends ListBoxItem {
public MyListBoxItem(MyListBox listBox, String name, int theValue) {
super(listBox, name, theValue);
}
public int getValue() {
return value;
}
public String getName() {
return name;
}
}
public class MyButton extends Button {
public MyButton(ControlP5 theControlP5, ControllerGroup theParent, String theName, float theDefaultValue, int theX, int theY, int theWidth, int theHeight, boolean theBroadcastFlag) {
super(theControlP5, theParent, theName, theDefaultValue, theX, theY, theWidth, theHeight);
}
}

Add these classes to your code and use MyDropdownList instead of the ControlP5.DropdownList. Use MyDropdownList. setIndex to set the value of the DropdownList.

phillarby

Re: ControlP5 Dropdown setValue

1 year ago

Great, thanks.

When an item is selected from teh dropdown I needed to use the controlEvent to trigger updates to setIndex and isOpen to get the control to behave as I wanted, but once I had realised this it works perfectly.

For anyone else trying this, here is a snippet of how I got this working.

public class SomeControls
{
ControlGroup cg;
MyDropdownList WaveSelector;
public SomeControls(CustomWave[] waves)
{
cg = controlP5.addGroup("ctrlGroup", 0, 0);
//Create a MyDropdownList for selecting a specific wave
WaveSelector = new MyDropdownList(controlP5, cg, "WavePicker", 10, 20, 100, 120);
//Add the waves to the dropdown
for(int i = 0; i < theWaves.length; i++) {
WaveSelector.addItem("Wave " + (i+1),i);
}
//Dropdown will be expanded by default if no initial state is set
WaveSelector.setOpen(false);
}
//Programatically set the selected dropdown value
//Note: This does not fire a controlEvent so any logic needs to be handled elsewhere if required
public void SelectWave(int index)
{
WaveSelector.setIndex(index);
WaveSelector.setOpen(false);
}
}

//handle controlEvents from the ControlP5 library controls
void controlEvent(ControlEvent theEvent)
{
if (theEvent.isGroup()) {
if (debug) println("P5 Group controlEvent: " + theEvent.group().name() + ": " + (int)theEvent.group().value());
//Set up for wave picker
if (theEvent.group().name() == "WavePicker")
{
MyControls.SelectWave((int)theEvent.group().value());
}
}
}

Phil

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