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130 行
4.9 KiB

using UnityEngine;
using UnityEditor;
using System.Reflection;
using System.Collections;
using System;
using System.Collections.Generic;
namespace NaughtyAttributes.Editor
{
[PropertyDrawer(typeof(DropdownAttribute))]
public class DropdownPropertyDrawer : PropertyDrawer
{
public override void DrawProperty(SerializedProperty property)
{
EditorDrawUtility.DrawHeader(property);
DropdownAttribute dropdownAttribute = PropertyUtility.GetAttribute<DropdownAttribute>(property);
UnityEngine.Object target = PropertyUtility.GetTargetObject(property);
FieldInfo fieldInfo = ReflectionUtility.GetField(target, property.name);
FieldInfo valuesFieldInfo = ReflectionUtility.GetField(target, dropdownAttribute.ValuesFieldName);
if (valuesFieldInfo == null)
{
this.DrawWarningBox(string.Format("{0} cannot find a values field with name \"{1}\"", dropdownAttribute.GetType().Name, dropdownAttribute.ValuesFieldName));
EditorGUILayout.PropertyField(property, true);
}
else if (valuesFieldInfo.GetValue(target) is IList &&
fieldInfo.FieldType == this.GetElementType(valuesFieldInfo))
{
// Selected value
object selectedValue = fieldInfo.GetValue(target);
// Values and display options
IList valuesList = (IList)valuesFieldInfo.GetValue(target);
object[] values = new object[valuesList.Count];
string[] displayOptions = new string[valuesList.Count];
for (int i = 0; i < values.Length; i++)
{
object value = valuesList[i];
values[i] = value;
displayOptions[i] = value.ToString();
}
// Selected value index
int selectedValueIndex = Array.IndexOf(values, selectedValue);
if (selectedValueIndex < 0)
{
selectedValueIndex = 0;
}
// Draw the dropdown
this.DrawDropdown(target, fieldInfo, property.displayName, selectedValueIndex, values, displayOptions);
}
else if (valuesFieldInfo.GetValue(target) is IDropdownList)
{
// Current value
object selectedValue = fieldInfo.GetValue(target);
// Current value index, values and display options
IDropdownList dropdown = (IDropdownList)valuesFieldInfo.GetValue(target);
IEnumerator<KeyValuePair<string, object>> dropdownEnumerator = dropdown.GetEnumerator();
int index = -1;
int selectedValueIndex = -1;
List<object> values = new List<object>();
List<string> displayOptions = new List<string>();
while (dropdownEnumerator.MoveNext())
{
index++;
KeyValuePair<string, object> current = dropdownEnumerator.Current;
if (current.Value.Equals(selectedValue))
{
selectedValueIndex = index;
}
values.Add(current.Value);
displayOptions.Add(current.Key);
}
if (selectedValueIndex < 0)
{
selectedValueIndex = 0;
}
// Draw the dropdown
this.DrawDropdown(target, fieldInfo, property.displayName, selectedValueIndex, values.ToArray(), displayOptions.ToArray());
}
else
{
this.DrawWarningBox(typeof(DropdownAttribute).Name + " works only when the type of the field is equal to the element type of the array");
EditorGUILayout.PropertyField(property, true);
}
}
private Type GetElementType(FieldInfo listFieldInfo)
{
if (listFieldInfo.FieldType.IsGenericType)
{
return listFieldInfo.FieldType.GetGenericArguments()[0];
}
else
{
return listFieldInfo.FieldType.GetElementType();
}
}
private void DrawDropdown(UnityEngine.Object target, FieldInfo fieldInfo, string label, int selectedValueIndex, object[] values, string[] displayOptions)
{
EditorGUI.BeginChangeCheck();
int newIndex = EditorGUILayout.Popup(label, selectedValueIndex, displayOptions);
if (EditorGUI.EndChangeCheck())
{
Undo.RecordObject(target, "Dropdown");
fieldInfo.SetValue(target, values[newIndex]);
}
}
private void DrawWarningBox(string message)
{
EditorGUILayout.HelpBox(message, MessageType.Warning);
Debug.LogWarning(message);
}
}
}