EditorGUILayout.Foldout  

static function Foldout (foldout : boolean, content : String, style : GUIStyle = EditorStyles.foldout) : boolean

static function Foldout (foldout : boolean, content : GUIContent, style : GUIStyle = EditorStyles.foldout) : boolean

Parameters

Returns

boolean - The foldout state selected by the user. If true, you should render sub-objects.

Description

Make a label with a foldout arrow to the left of it.

This is useful for creating tree or folder like structures where child objects are only shown if the parent is folded out.

Create a foldable menu that hides/shows the selected transform.

// Create a foldable menu that hides/shows the selected transform
// position.
// if no Transform is selected, the Foldout item will be folded until
// a transform is selected.

class FoldoutUsage extends EditorWindow {

    var showPosition : boolean = true;
    var status : String = "Select a GameObject";
    @MenuItem("Examples/Foldout Usage")
    static function Init() {
        var window = GetWindow(FoldoutUsage);
        window.Show();
    }
    
    function OnGUI() {
        showPosition = EditorGUILayout.Foldout(showPosition, status);
        if(showPosition)
            if(Selection.activeTransform) {
                Selection.activeTransform.position = 
                    EditorGUILayout.Vector3Field("Position", Selection.activeTransform.position);
                    status = Selection.activeTransform.name;
            }
        
        if(!Selection.activeTransform) {
            status = "Select a GameObject";
            showPosition = false;    
        }
    }
    function OnInspectorUpdate() {
        this.Repaint();
    }
}