41 lines
1.6 KiB
C#
41 lines
1.6 KiB
C#
using UnityEngine;
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using UnityEditor;
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/// <summary>
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/// Drawer for the RequireInterface attribute.
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/// </summary>
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[CustomPropertyDrawer(typeof(RequireInterfaceAttribute))]
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public class RequireInterfaceDrawer : PropertyDrawer
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{
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/// <summary>
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/// Overrides GUI drawing for the attribute.
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/// </summary>
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/// <param name="position">Position.</param>
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/// <param name="property">Property.</param>
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/// <param name="label">Label.</param>
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public override void OnGUI(Rect position, SerializedProperty property, GUIContent label)
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{
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// Check if this is reference type property.
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if (property.propertyType == SerializedPropertyType.ObjectReference)
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{
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// Get attribute parameters.
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var requiredAttribute = this.attribute as RequireInterfaceAttribute;
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// Begin drawing property field.
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EditorGUI.BeginProperty(position, label, property);
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// Draw property field.
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property.objectReferenceValue = EditorGUI.ObjectField(position, label, property.objectReferenceValue, requiredAttribute.requiredType, true);
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// Finish drawing property field.
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EditorGUI.EndProperty();
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}
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else
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{
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// If field is not reference, show error message.
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// Save previous color and change GUI to red.
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var previousColor = GUI.color;
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GUI.color = Color.red;
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// Display label with error message.
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EditorGUI.LabelField(position, label, new GUIContent("Property is not a reference type"));
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// Revert color change.
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GUI.color = previousColor;
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}
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}
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} |