AUI

Appearance

Talking to other Udon scripts ​

Both directions are typed references. No SetProgramVariable, no string event names.

UI to script ​

Declare a normal public field in the view's .cs half and set it in the inspector:

csharp
namespace Armagan.AUI.Generated
{
    public partial class SettingsPanel : AuiView
    {
        public WorldBrightness brightness;

        public void BrightnessChanged(float value)
        {
            if (brightness != null) brightness.SetPercent(value);
        }
    }
}

A prefab cannot reference a scene object

Set the field on the scene instance, not on the prefab asset. Unity records it as an instance override. This is a Unity rule, not an AUI one.

Script to UI ​

Hold the generated class and set its properties:

csharp
public class WorldBrightness : UdonSharpBehaviour
{
    public SettingsPanel panel;

    private void Start()
    {
        if (panel != null) panel.Brightness = 70f;
    }
}

Setters from code repaint every bound element and never call the handler, so this cannot loop back into BrightnessChanged.

You do not have to worry about start order: every public entry point starts the view first, so writing to a panel that has not started yet, or that sits on a hidden page, works.

A worked pair ​

aui
<view name="SettingsPanel" width="440" height="300">
  <panel class="setting">
    <text key="settings.brightness"/>
    <spacer/>
    <slider bind="{brightness}" min="0" max="100" step="1"
            format-key="settings.percent" onchange="BrightnessChanged"/>
  </panel>
  <panel class="setting">
    <text key="settings.solid"/>
    <spacer/>
    <toggle bind="{solid}" icon="check" onchange="SolidChanged"/>
  </panel>
</view>
csharp
public partial class SettingsPanel : AuiView
{
    public WorldBrightness world;

    protected override void OnStart()
    {
        if (world == null) return;
        Brightness = world.GetPercent();   // the slider moves; no handler fires
        Solid      = world.IsSolid();
    }

    public void BrightnessChanged(float value) { if (world != null) world.SetPercent(value); }
    public void SolidChanged(bool value)       { if (world != null) world.SetSolid(value); }
}

The shape to copy: OnStart pulls the world's current state into the bindings, and the handlers push player changes back out.

Scripts that must not know the view ​

A library script that should work with any panel can take an AuiView and use the base API:

csharp
public class PanelToggler : UdonSharpBehaviour
{
    public AuiView view;

    public override void Interact()
    {
        if (view == null) return;
        if (view.IsVisible()) view.Hide(); else view.Show();
    }
}

Available on the base class without knowing the concrete view: Show, Hide, Toggle, IsVisible, Back, GetElement("#id"), SetText, SetIcon, AddClassNamed, SetActiveElem, SetRepeatCount, CreateElementByTag, SetStyleVariable, Relayout, and the rest of the view API.

For anything view-specific, use the generated class. That is the point of generating it.

Custom events ​

A view is a normal UdonSharpBehaviour, so SendCustomEvent works:

csharp
view.SendCustomEvent("_Retranslate");   // repaint after a language change
view.SendCustomEvent("_TestRun");       // your own test entry point

Useful from editor scripts and from Udon Graph. From UdonSharp, prefer the typed call.

Networking ​

Nothing about a view is networked. Every generated behaviour is BehaviourSyncMode.None.

If two players should see the same panel state, sync it in your script and push it into the view on each client:

csharp
[UdonSynced] private int _stock;

public override void OnDeserialization()
{
    if (panel != null) panel.Stock = _stock.ToString();
}

That keeps the sync surface small and under your control, which is what you want in Udon anyway.

Next ​