public bool RemoveElement(ElementInfo elm)
{
if (elm != null && elm.ParentViewport == this)// && !elm.IsLocked)
{
bool bIsBack = (Elements.Count > 0 && elm == Elements[0]);
elm.OnBeforeRemove();
if (Elements.Remove(elm))
{
if (SelectedElementInfo == elm)
{
SelectedElementInfo = null;
}
ParentSceneInfo.OnViewportElementRemoved(elm);
if (bIsBack)
{
Elements.Insert(0, null);
foreach (var e in Elements)
{
if (e != null && e != elm)
{
e.OnViewportBackImageChanged(null, true);
}
}
}
return(true);
}
}
return(false);
}
public bool AddElement(ElementInfo elm)
{
if (Elements.Contains(elm))
{
return(false);
}
elm.m_ParentViewport = this;
if (Elements.Count == 0 || !(elm is ElementInfo_BackgroundImage))
{
Elements.Add(elm);
}
else
{
Elements[0] = elm;
}
if (elm.Resource != null && !elm.Resource.IsLoaded)
{
elm.Resource.Load();
}
elm.OnAfterAdded();
if (elm == Elements[0])
{
float zero = 0;
elm.Update(0, ref zero);
foreach (var e in Elements)
{
if (e != null && e != elm)
{
e.OnViewportBackImageChanged(elm as ElementInfo_BackgroundImage, true);
}
}
}
else if (BackImage != null)
{
elm.OnViewportBackImageChanged(BackImage, false);
}
ParentSceneInfo.OnViewportElementAdded(elm);
return(true);
}
