MessageBox Attribute

Attribute to display a message box depending on a condition.

Parameters:

string message: The message to display
string conditionName: The condition to evaluate
object enumValue: The value of the enum
optional, MessageMode messageType: The type of the message
optional, StringInputMode stringInputMode: Set if the string input is set trough a constant or dynamically trough another member
optional, bool drawAbove: Draws the HelpBox above the attached field

Example:

using UnityEngine;
using EditorAttributes;

public class AttributesExample : MonoBehaviour
{
        [SerializeField] private bool condition;

        [SerializeField, MessageBox("This is a normal message box", nameof(condition), MessageMode.None)]
        private Void messageBox;

        [SerializeField, MessageBox("This is a log message box", nameof(condition), MessageMode.Log)]
        private Void messageBoxLog;

        [SerializeField, MessageBox("This is a warning message box", nameof(condition), MessageMode.Warning)]
        private Void messageBoxWarning;

        [SerializeField, MessageBox("This is a error message box", nameof(condition), MessageMode.Error)]
        private Void messageBoxError;
}

The message boxes will show only when the condition is true.

You can also use an enum as a condition like so:

using UnityEngine;
using EditorAttributes;

public class AttributesExample : MonoBehaviour
{
        public enum States
        {
                State01,
                State02,
                State03
        }

        [SerializeField] private States condition;

        [SerializeField, MessageBox("This is a message box", nameof(condition), States.State02)]
        private string messageBox;
}

The message boxes will show when the enum is set to State02.

You can dynamically change the message by setting the stringInputMode parameter to dynamic and specify a member name in the string parameter to get the string value from:

using UnityEngine;
using EditorAttributes;

public class AttributesExample : MonoBehaviour
{
        [SerializeField] private bool condition;

        [MessageBox(nameof(stringField), nameof(condition), stringInputMode: StringInputMode.Dynamic)]
        [SerializeField] private string stringField;
}

MessageBoxes have rich text support.