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173 lines
6.6 KiB
173 lines
6.6 KiB
3 years ago
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using UnityEngine;
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using UnityEngine.UI;
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using System.Collections;
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namespace UnityEngine.UI
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{
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[AddComponentMenu("UI/Loop Vertical Scroll Rect(MultiPrefab)", 53)]
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[DisallowMultipleComponent]
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public class LoopVerticalScrollRectMulti : LoopScrollRectMulti
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{
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protected override float GetSize(RectTransform item, bool includeSpacing)
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{
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float size = includeSpacing ? contentSpacing : 0;
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if (m_GridLayout != null)
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{
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size += m_GridLayout.cellSize.y;
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}
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else
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{
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size += LayoutUtility.GetPreferredHeight(item);
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}
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size *= m_Content.localScale.y;
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return size;
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}
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protected override float GetDimension(Vector2 vector)
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{
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return vector.y;
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}
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protected override float GetAbsDimension(Vector2 vector)
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{
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return vector.y;
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}
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protected override Vector2 GetVector(float value)
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{
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return new Vector2(0, value);
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}
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protected override void Awake()
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{
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direction = LoopScrollRectDirection.Vertical;
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base.Awake();
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GridLayoutGroup layout = content.GetComponent<GridLayoutGroup>();
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if (layout != null && layout.constraint != GridLayoutGroup.Constraint.FixedColumnCount)
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{
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Debug.LogError("[LoopHorizontalScrollRect] unsupported GridLayoutGroup constraint");
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}
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}
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protected override bool UpdateItems(Bounds viewBounds, Bounds contentBounds)
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{
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bool changed = false;
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// special case: handling move several page in one frame
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if (viewBounds.max.y < contentBounds.min.y && itemTypeEnd > itemTypeStart)
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{
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int maxItemTypeStart = -1;
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if (totalCount >= 0)
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{
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maxItemTypeStart = Mathf.Max(0, totalCount - (itemTypeEnd - itemTypeStart));
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}
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float currentSize = contentBounds.size.y;
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float elementSize = (currentSize - contentSpacing * (CurrentLines - 1)) / CurrentLines;
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ReturnToTempPool(true, itemTypeEnd - itemTypeStart);
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itemTypeStart = itemTypeEnd;
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int offsetCount = Mathf.FloorToInt((contentBounds.min.y - viewBounds.max.y) / (elementSize + contentSpacing));
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if (maxItemTypeStart >= 0 && itemTypeStart + offsetCount * contentConstraintCount > maxItemTypeStart)
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{
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offsetCount = Mathf.FloorToInt((float)(maxItemTypeStart - itemTypeStart) / contentConstraintCount);
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}
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itemTypeStart += offsetCount * contentConstraintCount;
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if (totalCount >= 0)
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{
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itemTypeStart = Mathf.Max(itemTypeStart, 0);
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}
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itemTypeEnd = itemTypeStart;
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float offset = offsetCount * (elementSize + contentSpacing);
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content.anchoredPosition -= new Vector2(0, offset + (reverseDirection ? 0 : currentSize));
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contentBounds.center -= new Vector3(0, offset + currentSize / 2, 0);
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contentBounds.size = Vector3.zero;
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changed = true;
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}
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if (viewBounds.min.y > contentBounds.max.y && itemTypeEnd > itemTypeStart)
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{
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float currentSize = contentBounds.size.y;
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float elementSize = (currentSize - contentSpacing * (CurrentLines - 1)) / CurrentLines;
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ReturnToTempPool(false, itemTypeEnd - itemTypeStart);
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itemTypeEnd = itemTypeStart;
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int offsetCount = Mathf.FloorToInt((viewBounds.min.y - contentBounds.max.y) / (elementSize + contentSpacing));
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if (totalCount >= 0 && itemTypeStart - offsetCount * contentConstraintCount < 0)
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{
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offsetCount = Mathf.FloorToInt((float)(itemTypeStart) / contentConstraintCount);
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}
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itemTypeStart -= offsetCount * contentConstraintCount;
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if (totalCount >= 0)
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{
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itemTypeStart = Mathf.Max(itemTypeStart, 0);
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}
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itemTypeEnd = itemTypeStart;
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float offset = offsetCount * (elementSize + contentSpacing);
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content.anchoredPosition += new Vector2(0, offset + (reverseDirection ? currentSize : 0));
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contentBounds.center += new Vector3(0, offset + currentSize / 2, 0);
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contentBounds.size = Vector3.zero;
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changed = true;
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}
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if (viewBounds.min.y > contentBounds.min.y + threshold + m_ContentBottomPadding)
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{
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float size = DeleteItemAtEnd(), totalSize = size;
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while (size > 0 && viewBounds.min.y > contentBounds.min.y + threshold + m_ContentBottomPadding + totalSize)
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{
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size = DeleteItemAtEnd();
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totalSize += size;
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}
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if (totalSize > 0)
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changed = true;
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}
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if (viewBounds.max.y < contentBounds.max.y - threshold - m_ContentTopPadding)
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{
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float size = DeleteItemAtStart(), totalSize = size;
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while (size > 0 && viewBounds.max.y < contentBounds.max.y - threshold - m_ContentTopPadding - totalSize)
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{
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size = DeleteItemAtStart();
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totalSize += size;
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}
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if (totalSize > 0)
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changed = true;
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}
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if (viewBounds.min.y < contentBounds.min.y + m_ContentBottomPadding)
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{
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float size = NewItemAtEnd(), totalSize = size;
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while (size > 0 && viewBounds.min.y < contentBounds.min.y + m_ContentBottomPadding - totalSize)
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{
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size = NewItemAtEnd();
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totalSize += size;
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}
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if (totalSize > 0)
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changed = true;
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}
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if (viewBounds.max.y > contentBounds.max.y - m_ContentTopPadding)
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{
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float size = NewItemAtStart(), totalSize = size;
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while (size > 0 && viewBounds.max.y > contentBounds.max.y - m_ContentTopPadding + totalSize)
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{
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size = NewItemAtStart();
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totalSize += size;
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}
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if (totalSize > 0)
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changed = true;
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}
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if (changed)
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{
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ClearTempPool();
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}
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return changed;
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}
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}
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}
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