void Update()
{
if (_reloadData)
{
// if the reload flag is true, then reload the data
ReloadData();
}
// if the scroll rect size has changed and looping is on,
// or the loop setting has changed, then we need to resize
if (
(loop && _lastScrollRectSize != ScrollRectSize)
||
(loop != _lastLoop)
)
{
_Resize(true);
_lastScrollRectSize = ScrollRectSize;
_lastLoop = loop;
}
// update the scroll bar visibility if it has changed
if (_lastScrollbarVisibility != scrollbarVisibility)
{
ScrollbarVisibility = scrollbarVisibility;
_lastScrollbarVisibility = scrollbarVisibility;
}
// determine if the scroller has started or stopped scrolling
// and call the delegate if so.
if (LinearVelocity != 0 && !IsScrolling)
{
IsScrolling = true;
if (scrollerScrollingChanged != null) scrollerScrollingChanged(this, true);
}
else if (LinearVelocity == 0 && IsScrolling)
{
IsScrolling = false;
if (scrollerScrollingChanged != null) scrollerScrollingChanged(this, false);
}
}
/// <summary>
/// Caches and initializes the scroller
/// </summary>
void Awake()
{
GameObject go;
// cache some components
_scrollRect = this.GetComponent<ScrollRect>();
_scrollRectTransform = _scrollRect.GetComponent<RectTransform>();
// destroy any content objects if they exist. Likely there will be
// one at design time because Unity gives errors if it can't find one.
if (_scrollRect.content != null)
{
DestroyImmediate(_scrollRect.content.gameObject);
}
// Create a new active cell view container with a layout group
go = new GameObject("Container", typeof(RectTransform));
go.transform.SetParent(_scrollRectTransform, false);
if (scrollDirection == ScrollDirectionEnum.Vertical)
go.AddComponent<VerticalLayoutGroup>();
else
go.AddComponent<HorizontalLayoutGroup>();
_container = go.GetComponent<RectTransform>();
// set the containers anchor and pivot
if (scrollDirection == ScrollDirectionEnum.Vertical)
{
_container.anchorMin = new Vector2(0, 1);
_container.anchorMax = Vector2.one;
_container.pivot = new Vector2(0.5f, 1f);
}
else
{
_container.anchorMin = Vector2.zero;
_container.anchorMax = new Vector2(0, 1f);
_container.pivot = new Vector2(0, 0.5f);
}
_container.offsetMax = Vector2.zero;
_container.offsetMin = Vector2.zero;
_container.localScale = Vector3.one;
_scrollRect.content = _container;
// cache the scrollbar if it exists
if (scrollDirection == ScrollDirectionEnum.Vertical)
{
_scrollbar = _scrollRect.verticalScrollbar;
}
else
{
_scrollbar = _scrollRect.horizontalScrollbar;
}
// cache the layout group and set up its spacing and padding
_layoutGroup = _container.GetComponent<HorizontalOrVerticalLayoutGroup>();
_layoutGroup.spacing = spacing;
_layoutGroup.padding = padding;
_layoutGroup.childAlignment = TextAnchor.UpperLeft;
_layoutGroup.childForceExpandHeight = (scrollDirection == ScrollDirectionEnum.Vertical ? false : true);
_layoutGroup.childForceExpandWidth = (scrollDirection == ScrollDirectionEnum.Vertical ? true : false);
// force the scroller to scroll in the direction we want
_scrollRect.horizontal = scrollDirection == ScrollDirectionEnum.Horizontal;
_scrollRect.vertical = scrollDirection == ScrollDirectionEnum.Vertical;
// create the padder objects
go = new GameObject("First Padder", typeof(RectTransform), typeof(LayoutElement));
go.transform.SetParent(_container, false);
_firstPadder = go.GetComponent<LayoutElement>();
go = new GameObject("Last Padder", typeof(RectTransform), typeof(LayoutElement));
go.transform.SetParent(_container, false);
_lastPadder = go.GetComponent<LayoutElement>();
// create the recycled cell view container
go = new GameObject("Recycled Cells", typeof(RectTransform));
go.transform.SetParent(_scrollRect.transform, false);
_recycledCellViewContainer = go.GetComponent<RectTransform>();
_recycledCellViewContainer.gameObject.SetActive(false);
// set up the last values for updates
_lastScrollRectSize = ScrollRectSize;
_lastLoop = loop;
_lastScrollbarVisibility = scrollbarVisibility;
}
