// ----------------------------------------------------------------------------
// Unite 2017 - Game Architecture with Scriptable Objects
//
// Author: Ryan Hipple
// Date: 10/04/17
// ----------------------------------------------------------------------------
/******************************************************************************
* Note from me:
* If you have not watched this presentation, drop everything and watch it now
* https://youtu.be/raQ3iHhE_Kk
*
* YOU MUST MASTER THIS CONTENT!
*****************************************************************************/
using UnityEditor;
using UnityEngine;
namespace Architecture.Variables
{
[CustomPropertyDrawer(typeof(FloatReference))]
public class FloatReferenceDrawer : PropertyDrawer
{
///
/// Options to display in the popup to select constant or variable.
///
private readonly string[] popupOptions =
{ "Use Constant", "Use Variable" };
/// Cached style to use to draw the popup button.
private GUIStyle popupStyle;
public override void OnGUI(Rect position, SerializedProperty property, GUIContent label)
{
if (popupStyle == null)
{
popupStyle = new GUIStyle(GUI.skin.GetStyle("PaneOptions"));
popupStyle.imagePosition = ImagePosition.ImageOnly;
}
label = EditorGUI.BeginProperty(position, label, property);
position = EditorGUI.PrefixLabel(position, label);
EditorGUI.BeginChangeCheck();
// Get properties
SerializedProperty useConstant = property.FindPropertyRelative("UseConstant");
SerializedProperty constantValue = property.FindPropertyRelative("ConstantValue");
SerializedProperty variable = property.FindPropertyRelative("Variable");
// Calculate rect for configuration button
Rect buttonRect = new Rect(position);
buttonRect.yMin += popupStyle.margin.top;
buttonRect.width = popupStyle.fixedWidth + popupStyle.margin.right;
position.xMin = buttonRect.xMax;
// Store old indent level and set it to 0, the PrefixLabel takes care of it
int indent = EditorGUI.indentLevel;
EditorGUI.indentLevel = 0;
int result = EditorGUI.Popup(buttonRect, useConstant.boolValue ? 0 : 1, popupOptions, popupStyle);
useConstant.boolValue = result == 0;
EditorGUI.PropertyField(position,
useConstant.boolValue ? constantValue : variable,
GUIContent.none);
if (EditorGUI.EndChangeCheck())
property.serializedObject.ApplyModifiedProperties();
EditorGUI.indentLevel = indent;
EditorGUI.EndProperty();
}
}
}