private void UpdateScrollBar(ScrollRect scrollView, Entity scrollBarEntity, float2 contentToViewportRatio,
ref ScrollViewTransforms transforms, ScrollBarAxis axis)
{
var scrollBar = ScrollBarFromEntity[scrollBarEntity];
var areaTransform = RectTransformFromEntity[scrollBarEntity];
var handleTransform = RectTransformFromEntity[scrollBar.ScrollHandle];
var scrollBarSize = math.saturate(contentToViewportRatio);
float2 moveRange = (transforms.ViewportRect.Size - transforms.ContentRect.Size);
float2 contentSize = transforms.ContentRect.Size;
if (axis == ScrollBarAxis.Vertical)
{
areaTransform.AnchorMin = new float2(areaTransform.AnchorMin.x, 0.0f);
areaTransform.AnchorMax = new float2(areaTransform.AnchorMax.x, 1.0f);
areaTransform.Pivot = new float2(1.0f, 1.0f);
areaTransform.SizeDelta = new float2(areaTransform.SizeDelta.x, -(areaTransform.SizeDelta.x + scrollView.HorizontalBarSpacing));
var areaRect = RectTransformUtils.CalculateWorldSpaceRect(transforms.ScrollViewRect,
ElementScaleFromEntity[scrollBarEntity].Value, areaTransform);
handleTransform.AnchorMin = new float2(0.0f, scrollBar.Value * (1.0f - scrollBarSize.y));
handleTransform.AnchorMax =
new float2(1.0f, handleTransform.AnchorMin.y + scrollBarSize.y);
WorldSpaceRect handleRect = RectTransformUtils.CalculateWorldSpaceRect(areaRect, ElementScaleFromEntity[scrollBarEntity].Value,
handleTransform);
scrollBar.HandleDragSensitivity = 1.0f / (areaRect.Size.y - handleRect.Size.y);
scrollBar.RectDragSensitivity = scrollBar.HandleDragSensitivity / ((transforms.ContentRect.Size.y - transforms.ViewportRect.Size.y) / (areaRect.Size.y - handleRect.Size.y));
transforms.ContentRect.Min.y = transforms.ViewportRect.Min.y + scrollBar.Value * moveRange.y;
transforms.ContentRect.Max.y = transforms.ContentRect.Min.y + contentSize.y;
}
else
{
areaTransform.AnchorMin = new float2(0.0f, areaTransform.AnchorMin.y);
areaTransform.AnchorMax = new float2(1.0f, areaTransform.AnchorMax.y);
areaTransform.Pivot = new float2(0.0f, 0.0f);
areaTransform.SizeDelta = new float2(-(areaTransform.SizeDelta.y + scrollView.VerticalBarSpacing), areaTransform.SizeDelta.y);
var areaRect = RectTransformUtils.CalculateWorldSpaceRect(transforms.ScrollViewRect,
ElementScaleFromEntity[scrollBarEntity].Value, areaTransform);
handleTransform.AnchorMin = new float2(scrollBar.Value * (1.0f - scrollBarSize.x), 0.0f);
handleTransform.AnchorMax =
new float2(handleTransform.AnchorMin.x + scrollBarSize.x, 1.0f);
WorldSpaceRect handleRect = RectTransformUtils.CalculateWorldSpaceRect(areaRect, ElementScaleFromEntity[scrollBarEntity].Value,
handleTransform);
scrollBar.HandleDragSensitivity = 1.0f / (areaRect.Size.x - handleRect.Size.x);
scrollBar.RectDragSensitivity = scrollBar.HandleDragSensitivity / ((transforms.ContentRect.Size.x - transforms.ViewportRect.Size.x) / (areaRect.Size.x - handleRect.Size.x));
transforms.ContentRect.Min.x = transforms.ViewportRect.Min.x + scrollBar.Value * moveRange.x;
transforms.ContentRect.Max.x = transforms.ContentRect.Min.x + contentSize.x;
}
ScrollBarFromEntity[scrollBarEntity] = scrollBar;
RectTransformFromEntity[scrollBar.ScrollHandle] = handleTransform;
RectTransformFromEntity[scrollBarEntity] = areaTransform;
}
public void Execute(ArchetypeChunk chunk, int chunkIndex, int firstEntityIndex)
{
NativeArray <ScrollRect> scrollRect = chunk.GetNativeArray(ScrollRectType);
NativeArray <Entity> scrollEntity = chunk.GetNativeArray(EntityType);
var rebuildContext = new HierarchyRebuildContext()
{
ChildrenFromEntity = ChildrenFromEntity,
WorldSpaceRectFromEntity = WorldSpaceRectFromEntity,
RectTransformFromEntity = RectTransformFromEntity,
RebuildFlagFromEntity = RebuildFlagFromEntity,
ElementScaleFromEntity = ElementScaleFromEntity,
WorldSpaceMaskFromEntity = WorldSpaceMaskFromEntity,
RectMaskFromEntity = RectMaskFromEntity
};
for (int i = 0; i < scrollRect.Length; i++)
{
ScrollRect scrollView = scrollRect[i];
ScrollViewTransforms transforms = GatherTransforms(scrollEntity[i], scrollView);
var oldContentRect = transforms.ContentRect;
transforms.ViewportTransform.AnchorMin = new float2(0.0f, 0.0f);
transforms.ViewportTransform.AnchorMax = new float2(1.0f, 1.0f);
transforms.ViewportTransform.SizeDelta = new float2(-transforms.VerticalAreaTransform.SizeDelta.x - scrollView.VerticalBarSpacing, -transforms.HorizontalAreaTransform.SizeDelta.y - scrollView.HorizontalBarSpacing);
transforms.ViewportRect = RectTransformUtils.CalculateWorldSpaceRect(transforms.ScrollViewRect,
ElementScaleFromEntity[scrollEntity[i]].Value, transforms.ViewportTransform);
RectTransformFromEntity[scrollView.Viewport] = transforms.ViewportTransform;
var contentToViewportRatio = transforms.ViewportRect.Size / transforms.ContentRect.Size;
var verticalEntity = scrollView.VerticalBar;
if (ScrollBarFromEntity.Exists(verticalEntity))
{
UpdateScrollBar(scrollView, verticalEntity, contentToViewportRatio, ref transforms, ScrollBarAxis.Vertical);
}
var horizontalEntity = scrollView.HorizontalBar;
if (ScrollBarFromEntity.Exists(horizontalEntity))
{
UpdateScrollBar(scrollView, horizontalEntity, contentToViewportRatio, ref transforms, ScrollBarAxis.Horizontal);
}
if (NeedUpdate(oldContentRect, transforms.ContentRect))
{
var newContentTransform = RectTransformUtils.CalculateInverseTransformWithAnchors(transforms.ContentRect,
transforms.ViewportRect, transforms.ContentTransform, ElementScaleFromEntity[scrollView.Content].Value);
RectTransformFromEntity[scrollView.Content] = newContentTransform;
UpdateScrollRectTransform(scrollEntity[i], transforms.ScrollViewRect, rebuildContext);
}
}
}