protected internal override void ExecuteDefaultAction(EventBase evt)
{
base.ExecuteDefaultAction(evt);
if (evt.GetEventTypeId() == PostLayoutEvent.TypeId())
{
OnGeometryChanged((PostLayoutEvent)evt);
}
}
private void OnGeometryChanged(PostLayoutEvent evt)
{
// Only affected by dimension changes
if (evt.oldRect.size == evt.newRect.size)
{
return;
}
if (contentContainer.layout.width > Mathf.Epsilon)
{
horizontalScroller.Adjust(contentViewport.layout.width / contentContainer.layout.width);
}
if (contentContainer.layout.height > Mathf.Epsilon)
{
verticalScroller.Adjust(contentViewport.layout.height / contentContainer.layout.height);
}
// Set availability
horizontalScroller.SetEnabled(contentContainer.layout.width - layout.width > 0);
verticalScroller.SetEnabled(contentContainer.layout.height - layout.height > 0);
// Expand content if scrollbars are hidden
contentViewport.style.positionRight = needsVertical ? verticalScroller.layout.width : 0;
horizontalScroller.style.positionRight = needsVertical ? verticalScroller.layout.width : 0;
contentViewport.style.positionBottom = needsHorizontal ? horizontalScroller.layout.height : 0;
verticalScroller.style.positionBottom = needsHorizontal ? horizontalScroller.layout.height : 0;
if (needsHorizontal)
{
horizontalScroller.lowValue = 0.0f;
horizontalScroller.highValue = scrollableWidth;
}
else
{
horizontalScroller.value = 0.0f;
}
if (needsVertical)
{
verticalScroller.lowValue = 0.0f;
verticalScroller.highValue = scrollableHeight;
}
else
{
verticalScroller.value = 0.0f;
}
// Set visibility and remove/add content viewport margin as necessary
if (horizontalScroller.visible != needsHorizontal)
{
horizontalScroller.visible = needsHorizontal;
if (needsHorizontal)
{
contentViewport.AddToClassList("HorizontalScroll");
}
else
{
contentViewport.RemoveFromClassList("HorizontalScroll");
}
}
if (verticalScroller.visible != needsVertical)
{
verticalScroller.visible = needsVertical;
if (needsVertical)
{
contentViewport.AddToClassList("VerticalScroll");
}
else
{
contentViewport.RemoveFromClassList("VerticalScroll");
}
}
UpdateContentViewTransform();
}
