private void ResizeHeight(float height)
{
m_ScrollView.contentContainer.style.height = itemsSource.Count * itemHeight;
// Restore scroll offset and pre-emptively update the highValue
// in case this is the initial restore from persistent data and
// the ScrollView's OnGeometryChanged() didn't update the low
// and highValues.
m_ScrollView.verticalScroller.highValue = Mathf.Max(m_ScrollOffset, m_ScrollView.verticalScroller.highValue);
m_ScrollView.verticalScroller.value = m_ScrollOffset;
int itemCount = Math.Min((int)(height / itemHeight) + m_ExtraVisibleItems, itemsSource.Count);
if (m_VisibleItemCount != itemCount)
{
if (m_VisibleItemCount > itemCount)
{
// Shrink
int removeCount = m_VisibleItemCount - itemCount;
for (int i = 0; i < removeCount; i++)
{
m_Pool.RemoveAt(m_Pool.Count - 1);
m_ScrollView.RemoveAt(m_ScrollView.childCount - 1);
}
}
else
{
// Grow
int addCount = itemCount - m_VisibleItemCount;
for (int i = 0; i < addCount; i++)
{
int index = i + m_FirstVisibleIndex + m_VisibleItemCount;
var item = makeItem();
var recycledItem = new RecycledItem(item);
m_Pool.Add(recycledItem);
item.style.marginTop = 0;
item.style.marginBottom = 0;
item.style.positionType = PositionType.Absolute;
item.style.positionLeft = 0;
item.style.positionRight = 0;
item.style.height = itemHeight;
if (index < itemsSource.Count)
{
Setup(recycledItem, index);
}
else
{
item.style.visibility = Visibility.Hidden;
}
m_ScrollView.Add(item);
}
}
m_VisibleItemCount = itemCount;
}
m_LastHeight = height;
}
public void Refresh()
{
m_Pool.Clear();
m_ScrollView.Clear();
m_ScrollView.contentContainer.style.width = m_ScrollView.contentViewport.layout.width;
m_ScrollView.contentContainer.style.flex = 0;
if (!HasValidDataAndBindings())
{
return;
}
// Resize ScrollView in case the collection has changed.
m_ScrollView.contentContainer.style.height = itemsSource.Count * itemHeight;
// Restore scroll offset and pre-emptively update the highValue
// in case this is the initial restore from persistent data and
// the ScrollView's OnGeometryChanged() didn't update the low
// and highValues.
m_ScrollView.verticalScroller.highValue = Mathf.Max(m_ScrollOffset, m_ScrollView.verticalScroller.highValue);
m_ScrollView.verticalScroller.value = m_ScrollOffset;
if (m_LastSize != m_ScrollView.layout)
{
m_LastSize = m_ScrollView.layout;
}
if (float.IsNaN(m_LastSize.height))
{
return;
}
m_ScrollView.contentContainer.style.height = itemsSource.Count * itemHeight;
m_VisibleItemCount = (int)(m_LastSize.height / itemHeight) + m_ExtraVisibleItems;
for (var i = m_FirstVisibleIndex; i < m_VisibleItemCount + m_FirstVisibleIndex; i++)
{
var item = makeItem();
var recycledItem = new RecycledItem(item);
m_Pool.Add(recycledItem);
item.style.marginTop = 0;
item.style.marginBottom = 0;
item.style.positionType = PositionType.Absolute;
item.style.positionLeft = 0;
item.style.positionRight = 0;
item.style.height = itemHeight;
if (i < itemsSource.Count)
{
item.style.visibility = Visibility.Visible;
Setup(recycledItem, i);
}
else
{
item.style.visibility = Visibility.Hidden;
}
m_ScrollView.Add(item);
}
schedule.Execute(() => { Dirty(ChangeType.Layout); });
}
