EarlGrey/Traversal/GREYTraversal.h
//
// Copyright 2017 Google Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
#import <Foundation/Foundation.h>
#import <UIKit/UIKit.h>
NS_ASSUME_NONNULL_BEGIN
/**
* A private wrapper used to store information that is essential for printing the UI hierarchy
* appropriately and in correct order.
*/
@interface GREYTraversalObject : NSObject
/**
* An NSUInteger representing the number of parent-child relationships from the root element
* to the current element.
*/
@property(nonatomic) NSUInteger level;
/**
* The UI element that the GREYHierarchyObject is wrapped around.
*/
@property(nonatomic, strong) id element;
@end
/**
* Private class to traverse the UI Hierarchy.
* Provides helper methods to access the various elements present in the hierarchy.
*/
@interface GREYTraversal : NSObject
/**
* Instance method that returns the next object from the hierarchy. Needs to be implemented by
* subclasses. This class provides an empty implementation.
*
* @return An instance of the UI element that is next in the hierarchy.
*/
- (id _Nullable)nextObject NS_UNAVAILABLE;
/**
* Explores the immediate children of the @c element that is passed in.
*
* @param element The UI element whose children are to be explored.
*
* @return Creates a new array that contains the immediate children of @c element. The children are
* ordered from front to back, meaning subviews that were added first are present later
* in the array. If no children exist, then an empty array is returned.
*/
- (NSArray *)exploreImmediateChildren:(id)element;
@end
NS_ASSUME_NONNULL_END