108 lines
4.1 KiB
C#
108 lines
4.1 KiB
C#
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// Copyright (c) Pixel Crushers. All rights reserved.
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using UnityEngine;
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using System.Collections;
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namespace PixelCrushers
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{
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/// <summary>
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/// Enables a scrollbar only if the content is larger than the scroll rect. This component only
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/// only shows or hides the scrollbar when the component is enabled or when CheckScrollbar is invoked.
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/// </summary>
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[AddComponentMenu("")] // Use wrapper.
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public class UIScrollbarEnabler : MonoBehaviour
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{
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[Tooltip("The scroll rect.")]
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[UnityEngine.Serialization.FormerlySerializedAs("container")]
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public UnityEngine.UI.ScrollRect scrollRect = null;
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[Tooltip("The content inside the scroll rect. The scrollbar will be enabled if the content is taller than the scroll rect.")]
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[UnityEngine.Serialization.FormerlySerializedAs("content")]
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public RectTransform scrollContent = null;
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[Tooltip("The scrollbar to enable or disable. If scroll rect doesn't have a scrollbar, just scrolls scroll rect.")]
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public UnityEngine.UI.Scrollbar scrollbar = null;
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[Tooltip("Scroll smoothly instead of jumping to reset value.")]
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public bool smoothScroll = false;
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public float smoothScrollSpeed = 5;
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protected bool m_started = false;
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protected bool m_checking = false;
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protected RectTransform m_scrollRectTransform = null;
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protected virtual void Start()
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{
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m_started = true;
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CheckScrollbar();
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}
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public virtual void OnEnable()
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{
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if (m_started) CheckScrollbar();
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}
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public virtual void OnDisable()
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{
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m_checking = false;
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}
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public virtual void CheckScrollbar()
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{
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if (m_checking || scrollRect == null || scrollContent == null || !gameObject.activeInHierarchy || !enabled) return;
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StopAllCoroutines();
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StartCoroutine(CheckScrollbarAfterUIUpdate(false, 0));
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}
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public virtual void CheckScrollbarWithResetValue(float value)
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{
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if (m_checking || scrollRect == null || scrollContent == null || !gameObject.activeInHierarchy || !enabled) return;
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StopAllCoroutines();
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StartCoroutine(CheckScrollbarAfterUIUpdate(true, value));
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}
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protected virtual IEnumerator CheckScrollbarAfterUIUpdate(bool useResetValue, float resetValue)
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{
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m_checking = true;
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yield return null;
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if (scrollbar != null)
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{
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scrollbar.gameObject.SetActive(scrollContent.rect.height > scrollRect.GetComponent<RectTransform>().rect.height);
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}
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m_checking = false;
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yield return null;
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if (useResetValue)
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{
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if (smoothScroll)
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{
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var contentHeight = scrollContent.rect.height;
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if (m_scrollRectTransform == null) m_scrollRectTransform = scrollRect.GetComponent<RectTransform>();
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var scrollRectHeight = m_scrollRectTransform.rect.height;
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var needToScroll = contentHeight > scrollRectHeight;
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if (needToScroll)
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{
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var ratio = scrollRectHeight / contentHeight;
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var timeout = Time.time + 10f; // Avoid infinite loops by maxing out at 10 seconds.
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while (scrollRect.verticalNormalizedPosition > 0.01f && Time.time < timeout)
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{
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var newPos = scrollRect.verticalNormalizedPosition - smoothScrollSpeed * Time.deltaTime * ratio;
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scrollRect.verticalNormalizedPosition = Mathf.Max(0, newPos);
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yield return null;
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}
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}
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scrollRect.verticalNormalizedPosition = 0;
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}
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else
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{
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if (scrollbar != null) scrollbar.value = resetValue;
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scrollRect.verticalNormalizedPosition = resetValue;
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}
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}
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}
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}
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}
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