92 lines
2.8 KiB
C#
92 lines
2.8 KiB
C#
// 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 UnityEngine.UI;
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using System.Collections;
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/// Extension of Unity's built-in Scrollbar that integrates with PagedScrollRect.
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/// Dragging the scrollbar will control the PagedScrollRect.
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/// The Scrollbar will also automatically update when the PagedScrollRect
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/// is scrolled directly.
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public class PagedScrollBar : Scrollbar {
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#if UNITY_HAS_GOOGLEVR && (UNITY_ANDROID || UNITY_EDITOR)
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public const string PAGED_SCROLL_RECT_PROP_NAME = "pagedScrollRect";
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[SerializeField]
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private PagedScrollRect pagedScrollRect;
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private bool isDragging = false;
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private const float LERP_SPEED = 12.0f;
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private bool IsDragging {
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get {
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return isDragging;
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}
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set {
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if (isDragging == value) {
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return;
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}
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isDragging = value;
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if (!isDragging && pagedScrollRect != null) {
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pagedScrollRect.SetScrollOffsetOverride(null);
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}
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}
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}
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void Update() {
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if (pagedScrollRect == null) {
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Debug.LogWarning("PagedScrollRect must be set.");
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return;
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}
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// Update the size of the handle in case the PageCount has changed.
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float desiredSize = 1.0f / pagedScrollRect.PageCount;
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if (size != desiredSize) {
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size = desiredSize;
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}
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if (IsDragging) {
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float offset = value * (pagedScrollRect.PageCount - 1) * pagedScrollRect.PageSpacing;
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pagedScrollRect.SetScrollOffsetOverride(offset);
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} else {
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// If the PageCount is 1 make sure we don't divide by zero by just setting the value to 0 directly.
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if (pagedScrollRect.PageCount == 1) {
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value = 0.0f;
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} else {
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// Calculate the desired a value of the scrollbar.
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float desiredValue = (float) pagedScrollRect.ActivePageIndex / (pagedScrollRect.PageCount - 1);
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// Animate towards the desired value.
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value = Mathf.Lerp(value, desiredValue, Time.deltaTime * LERP_SPEED);
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}
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}
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}
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public override void OnPointerDown(UnityEngine.EventSystems.PointerEventData eventData) {
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base.OnPointerDown(eventData);
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IsDragging = true;
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}
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public override void OnPointerUp(UnityEngine.EventSystems.PointerEventData eventData) {
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base.OnPointerUp(eventData);
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IsDragging = false;
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}
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#endif // UNITY_HAS_GOOGLEVR &&(UNITY_ANDROID || UNITY_EDITOR
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}
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