using UnityEditor;
using UnityEngine;

[CustomPropertyDrawer(typeof(RTlerp))]
public class RTlerp_drawer : PropertyDrawer {
    public override void OnGUI(Rect position, SerializedProperty property, GUIContent label) {
        EditorGUI.BeginProperty(position, label, property);
        var h    = EditorGUIUtility.singleLineHeight; // высота = 1 строка
        var w    = position.width;
        var rect = position;
        rect.height = h;
        rect.width  = 100f;
        GUI.Label(rect, label);
        rect.x     += 100f;
        rect.width =  (w - 100f) * 0.5f;
        if (GUI.Button(rect, "Set FROM")) {
            EditorGUIUtility.ShowObjectPicker<RectTransform>(null, true, "", 9998887);
        }

        rect.x += rect.width;
        if (GUI.Button(rect, "Set TO")) {
            EditorGUIUtility.ShowObjectPicker<RectTransform>(null, true, "", 9998886);
        }

        if (Event.current.commandName != "ObjectSelectorClosed") return;
        if (EditorGUIUtility.GetObjectPickerControlID() == 9998887) {
            var rt = (RectTransform) EditorGUIUtility.GetObjectPickerObject();
            if (rt == null) return;
            property.FindPropertyRelative("sizeDelta_from").vector2Value        = rt.sizeDelta;
            property.FindPropertyRelative("anchoredPosition_from").vector2Value = rt.anchoredPosition;
        }
        else if (EditorGUIUtility.GetObjectPickerControlID() == 9998886) {
            var rt = (RectTransform) EditorGUIUtility.GetObjectPickerObject();
            if (rt == null) return;
            property.FindPropertyRelative("sizeDelta_to").vector2Value        = rt.sizeDelta;
            property.FindPropertyRelative("anchoredPosition_to").vector2Value = rt.anchoredPosition;
        }

        EditorGUI.EndProperty();
    }

    public override float GetPropertyHeight(SerializedProperty property, GUIContent label) {
        return EditorGUIUtility.singleLineHeight;
    }
}