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using UnityEngine;
using UnityEngine.UI;
using UnityEditorInternal;
using UnityEditor.AnimatedValues;
namespace UnityEditor.UI
{
[CustomEditor(typeof(LayoutElement), true)]
[CanEditMultipleObjects]
public class LayoutElementEditor : Editor
{
SerializedProperty m_IgnoreLayout;
SerializedProperty m_MinWidth;
SerializedProperty m_MinHeight;
SerializedProperty m_PreferredWidth;
SerializedProperty m_PreferredHeight;
SerializedProperty m_FlexibleWidth;
SerializedProperty m_FlexibleHeight;
SerializedProperty m_LayoutPriority;
protected virtual void OnEnable()
{
m_IgnoreLayout = serializedObject.FindProperty("m_IgnoreLayout");
m_MinWidth = serializedObject.FindProperty("m_MinWidth");
m_MinHeight = serializedObject.FindProperty("m_MinHeight");
m_PreferredWidth = serializedObject.FindProperty("m_PreferredWidth");
m_PreferredHeight = serializedObject.FindProperty("m_PreferredHeight");
m_FlexibleWidth = serializedObject.FindProperty("m_FlexibleWidth");
m_FlexibleHeight = serializedObject.FindProperty("m_FlexibleHeight");
m_LayoutPriority = serializedObject.FindProperty("m_LayoutPriority");
}
public override void OnInspectorGUI()
{
serializedObject.Update();
EditorGUILayout.PropertyField(m_IgnoreLayout);
if (!m_IgnoreLayout.boolValue)
{
EditorGUILayout.Space();
LayoutElementField(m_MinWidth, 0);
LayoutElementField(m_MinHeight, 0);
LayoutElementField(m_PreferredWidth, t => t.rect.width);
LayoutElementField(m_PreferredHeight, t => t.rect.height);
LayoutElementField(m_FlexibleWidth, 1);
LayoutElementField(m_FlexibleHeight, 1);
}
EditorGUILayout.PropertyField(m_LayoutPriority);
serializedObject.ApplyModifiedProperties();
}
void LayoutElementField(SerializedProperty property, float defaultValue)
{
LayoutElementField(property, _ => defaultValue);
}
void LayoutElementField(SerializedProperty property, System.Func<RectTransform, float> defaultValue)
{
Rect position = EditorGUILayout.GetControlRect();
// Label
GUIContent label = EditorGUI.BeginProperty(position, null, property);
// Rects
Rect fieldPosition = EditorGUI.PrefixLabel(position, label);
Rect toggleRect = fieldPosition;
toggleRect.width = 16;
Rect floatFieldRect = fieldPosition;
floatFieldRect.xMin += 16;
// Checkbox
EditorGUI.BeginChangeCheck();
bool enabled = EditorGUI.ToggleLeft(toggleRect, GUIContent.none, property.floatValue >= 0);
if (EditorGUI.EndChangeCheck())
{
// This could be made better to set all of the targets to their initial width, but mimizing code change for now
property.floatValue = (enabled ? defaultValue((target as LayoutElement).transform as RectTransform) : -1);
}
if (!property.hasMultipleDifferentValues && property.floatValue >= 0)
{
// Float field
EditorGUIUtility.labelWidth = 4; // Small invisible label area for drag zone functionality
EditorGUI.BeginChangeCheck();
float newValue = EditorGUI.FloatField(floatFieldRect, new GUIContent(" "), property.floatValue);
if (EditorGUI.EndChangeCheck())
{
property.floatValue = Mathf.Max(0, newValue);
}
EditorGUIUtility.labelWidth = 0;
}
EditorGUI.EndProperty();
}
}
}
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