Value Listener

Value Listener is a component that allows you to hook up events from a scriptable value in the inspector.

Scriptable Value Listener

Usage

Assign a scriptable value to the Target Value field of the component.

Then pick when you want to start listening. You can pick between Awake, Start, and OnEnable.

Awake: The listener will start listening in the Awake method.
Start: The listener will start listening in the Start method.
OnEnable: The listener will start listening in the OnEnable method.

Then pick when you want to stop listening. You can pick between OnDestroy and OnDisable.

OnDestroy: The listener will stop listening in the OnDestroy method.
OnDisable: The listener will stop listening in the OnDisable method.

After that you can pick when you want the events to be triggered. You can pick between Any, From Value, To Value, and From Value To Value.

Any: The event will be triggered any time the value changes.
From Value: The event will be triggered when the value changes from the value you set in the inspector.
To Value: The event will be triggered when the value changes to the value you set in the inspector.
From Value To Value: The event will be triggered when the value changes from the value you set in the inspector to the value you set in the inspector.

Lastly, you can pick how many parameters you want to use. You can pick between Single, Multiple, and Both.

Single: The event will be triggered with a single parameter.
Multiple: The event will be triggered with multiple parameters.
Both: The event will be triggered with both single and multiple parameters.

Extending

Value Listeners are extended by inheriting from the ScriptableValueListener<T> class. This will allow you to create your own value listeners for your own types.

using Hertzole.ScriptableValues;
using UnityEngine;

public class MyValueListener : ScriptableValueListener<MyValueType>
{
    // Simple as that!
}

You can also override methods based around the invoking of values.

using Hertzole.ScriptableValues;
using UnityEngine;

public class MyValueListener : ScriptableValueListener<MyValueType>
{
    protected override bool OnBeforeValueChangingInvoked(MyValueType oldValue, MyValueType newValue)
    {
        // Called before the OnValueChanging event is invoked.
        // Return true to allow the change, false to cancel it.
        return true;
    }

    protected override void OnAfterValueChangingInvoked(MyValueType oldValue, MyValueType newValue)
    {
        // Called after the OnValueChanging event is invoked.
    }

    protected override bool OnBeforeValueChangedInvoked(MyValueType oldValue, MyValueType newValue)
    {
        // Called before the OnValueChanged event is invoked.
        // Return true to allow the change, false to cancel it.
        return true;
    }

    protected override void OnAfterValueChangedInvoked(MyValueType oldValue, MyValueType newValue)
    {
        // Called after the OnValueChanged event is invoked.
    }
}