57 lines
2.1 KiB
C#
57 lines
2.1 KiB
C#
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// Copyright 2016 Google Inc. All rights reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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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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using UnityEngine;
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using System.Collections;
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/// Class that can fade the pages of a PagedScrollRect based on the page's offset.
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public class FadeScrollEffect : BaseScrollEffect {
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#if UNITY_HAS_GOOGLEVR && (UNITY_ANDROID || UNITY_EDITOR)
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[Range(0.0f, 1.0f)]
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[Tooltip("The alpha of the page when it is one page-length away.")]
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public float minAlpha = 0.0f;
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public override void ApplyEffect(BaseScrollEffect.UpdateData updateData) {
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CanvasGroup pageCanvasGroup = updateData.page.GetComponent<CanvasGroup>();
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/// All pages require a CanvasGroup for manipulating Alpha.
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if (pageCanvasGroup == null) {
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Debug.LogError("Cannot adjust alpha for page " + updateData.page.name + ", missing CanvasGroup");
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return;
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}
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// Calculate the difference
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float difference = updateData.scrollOffset - updateData.pageOffset;
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/// Calculate the alpha for this page.
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float alpha = 1.0f - (Mathf.Abs(difference) / updateData.spacing);
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alpha = (alpha * (1.0f - minAlpha)) + minAlpha;
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alpha = Mathf.Clamp(alpha, 0.0f, 1.0f);
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/// If this is the last page or the first page,
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/// Then we clamp the alpha to 1 when dragging past the edge
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/// Of the scrolling region.
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if (!updateData.looping) {
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if (updateData.pageIndex == 0 && difference < 0) {
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alpha = 1.0f;
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} else if (updateData.pageIndex == updateData.pageCount - 1 && difference > 0) {
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alpha = 1.0f;
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}
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}
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pageCanvasGroup.alpha = alpha;
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}
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#endif // UNITY_HAS_GOOGLEVR && (UNITY_ANDROID || UNITY_EDITOR)
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}
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