139 lines
4.2 KiB
C#
139 lines
4.2 KiB
C#
/*
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* Copyright (c) Meta Platforms, Inc. and affiliates.
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* All rights reserved.
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*
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* Licensed under the Oculus SDK License Agreement (the "License");
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* you may not use the Oculus SDK except in compliance with the License,
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* which is provided at the time of installation or download, or which
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* otherwise accompanies this software in either electronic or hard copy form.
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*
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* You may obtain a copy of the License at
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*
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* https://developer.oculus.com/licenses/oculussdk/
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*
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* Unless required by applicable law or agreed to in writing, the Oculus SDK
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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using UnityEngine;
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using UnityEngine.Assertions;
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using UnityEngine.UI;
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namespace Oculus.Interaction.Samples
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{
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public class CarouselView : MonoBehaviour
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{
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[SerializeField]
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private RectTransform _viewport;
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[SerializeField]
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private RectTransform _content;
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[SerializeField]
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private AnimationCurve _easeCurve = AnimationCurve.EaseInOut(0, 0, 1, 1);
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[SerializeField, Optional]
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private GameObject _emptyCarouselVisuals;
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public int CurrentChildIndex => _currentChildIndex;
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public RectTransform ContentArea => _content;
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private int _currentChildIndex = 0;
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private float _scrollVal = 0;
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protected virtual void Start()
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{
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this.AssertField(_viewport, nameof(_viewport));
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this.AssertField(_content, nameof(_content));
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}
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public void ScrollRight()
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{
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if (_content.childCount <= 1)
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{
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return;
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}
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else if (_currentChildIndex > 0)
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{
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RectTransform currentChild = GetCurrentChild();
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_content.GetChild(0).SetAsLastSibling();
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LayoutRebuilder.ForceRebuildLayoutImmediate(_content);
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ScrollToChild(currentChild, 1);
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}
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else
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{
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_currentChildIndex++;
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}
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_scrollVal = Time.time;
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}
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public void ScrollLeft()
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{
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if (_content.childCount <= 1)
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{
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return;
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}
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else if (_currentChildIndex < _content.childCount - 1)
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{
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RectTransform currentChild = GetCurrentChild();
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_content.GetChild(_content.childCount - 1).SetAsFirstSibling();
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LayoutRebuilder.ForceRebuildLayoutImmediate(_content);
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ScrollToChild(currentChild, 1);
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}
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else
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{
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_currentChildIndex--;
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}
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_scrollVal = Time.time;
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}
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private RectTransform GetCurrentChild()
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{
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return _content.GetChild(_currentChildIndex) as RectTransform;
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}
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private void ScrollToChild(RectTransform child, float amount01)
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{
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if (child == null)
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{
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return;
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}
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amount01 = Mathf.Clamp01(amount01);
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Vector3 viewportCenter = _viewport.TransformPoint(_viewport.rect.center);
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Vector3 imageCenter = child.TransformPoint(child.rect.center);
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Vector3 offset = imageCenter - viewportCenter;
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if (offset.sqrMagnitude > float.Epsilon)
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{
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Vector3 targetPosition = _content.position - offset;
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float lerp = Mathf.Clamp01(_easeCurve.Evaluate(amount01));
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_content.position = Vector3.Lerp(_content.position, targetPosition, lerp);
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}
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}
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protected virtual void Update()
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{
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_currentChildIndex = Mathf.Clamp(
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_currentChildIndex, 0, _content.childCount - 1);
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bool hasImages = _content.childCount > 0;
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if (hasImages)
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{
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RectTransform currentImage = GetCurrentChild();
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ScrollToChild(currentImage, Time.time - _scrollVal);
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}
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if (_emptyCarouselVisuals != null)
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{
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_emptyCarouselVisuals.SetActive(!hasImages);
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}
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}
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}
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}
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