/// <summary>
/// Append an item to the scroll view, assuming a vertical item layout.
/// </summary>
/// <param name="scroll">The scroll view object to operate on.</param>
/// <param name="contentChild">The child object to append. Must support <see cref="RectTransform"/>
/// <param name="subtractVerticalScrollBar">Allow for the width of the vertical scroll bar
/// such that it does not overlap the children's width?</param>
/// <remarks>
/// The child is arranged below all the exising child items.
/// </remarks>
public static void AppendContentV(this ScrollRect scroll, RectTransform contentChild, bool subtractVerticalScrollBar = false)
{
if (contentChild == null || scroll.content == null)
{
return;
}
float totalHeight = 0;
float height = 0;
float scrollWidth = (subtractVerticalScrollBar) ? scroll.GetVerticalScrollbarWidth() : 0;
RectTransform rectXForm;
Transform child;
for (int i = 0; i < scroll.content.childCount; ++i)
{
child = scroll.content.GetChild(i);
rectXForm = (child != null) ? child.GetComponent <RectTransform>() : null;
if (rectXForm == null || !rectXForm.gameObject.activeSelf)
{
continue;
}
// Preserve height.
totalHeight += rectXForm.rect.height;
}
// Preserve content height.
height = contentChild.rect.height;
contentChild.SetParent(scroll.content.transform, false);
contentChild.anchorMin = new Vector2(0, 1);
contentChild.anchorMax = new Vector2(1, 1);
contentChild.pivot = new Vector2(0, 1);
contentChild.offsetMin = new Vector2(0, -totalHeight - height);
contentChild.offsetMax = new Vector2(scrollWidth, -totalHeight);
if (contentChild.gameObject.activeSelf)
{
totalHeight += height;
}
RectTransform scrollContentRect = (scroll.content.transform as RectTransform);
scrollContentRect.sizeDelta = new Vector2(scrollContentRect.sizeDelta.x, totalHeight);
}
