private static IEnumerable <ModelItem> EnumerateContents(ModelItem start)
{
if (SelectionImplementation.IsSelectable(start))
{
yield return(start);
ModelProperty content = start.Content;
if (content != (ModelProperty)null && content.IsSet)
{
if (content.IsCollection)
{
foreach (ModelItem start1 in content.Collection)
{
foreach (ModelItem modelItem in SelectionImplementation.EnumerateContents(start1))
{
yield return(modelItem);
}
}
}
else
{
ModelItem value = content.Value;
if (value != null)
{
foreach (ModelItem modelItem in SelectionImplementation.EnumerateContents(value))
{
yield return(modelItem);
}
}
}
}
}
}
private static ModelItem GetLastChild(ModelItem modelItem, ViewService viewService)
{
ModelItem modelItem1 = modelItem;
bool flag = false;
while (modelItem != null && modelItem.Content != (ModelProperty)null && !flag)
{
if (modelItem.Content.IsCollection)
{
if (modelItem.Content.Collection.Count > 0)
{
modelItem = modelItem.Content.Collection[modelItem.Content.Collection.Count - 1];
}
else
{
flag = true;
}
}
else if (modelItem.Content.IsSet)
{
modelItem = modelItem.Content.Value;
}
else
{
flag = true;
}
if (modelItem != null && SelectionImplementation.IsSelectable(modelItem) && modelItem.View != (ViewItem)null)
{
modelItem1 = modelItem;
}
}
return(modelItem1);
}
private static ModelItem GetPreviousSibling(ModelItem modelItem, ViewService viewService)
{
ModelItem parent = modelItem.Parent;
if (parent == null || parent.Content == (ModelProperty)null || !parent.Content.IsCollection)
{
return((ModelItem)null);
}
int num = parent.Content.Collection.IndexOf(modelItem);
if (num <= 0)
{
return((ModelItem)null);
}
ModelItem modelItem1 = parent.Content.Collection[num - 1];
if (modelItem1.View == (ViewItem)null)
{
return((ModelItem)null);
}
if (!SelectionImplementation.IsSelectable(modelItem1))
{
return((ModelItem)null);
}
return(modelItem1);
}
private static ModelItem GetFirstChild(ModelItem modelItem, ViewService viewService)
{
ModelProperty content = modelItem.Content;
if (content == (ModelProperty)null)
{
return((ModelItem)null);
}
ModelItem modelItem1 = (ModelItem)null;
if (content.IsCollection)
{
if (content.Collection.Count == 0)
{
return((ModelItem)null);
}
modelItem1 = content.Collection[0];
}
else if (content.IsSet)
{
modelItem1 = content.Value;
}
if (modelItem1 == null || !SelectionImplementation.IsSelectable(modelItem1) || modelItem1.View == (ViewItem)null)
{
return((ModelItem)null);
}
return(modelItem1);
}
private static Selection SelectContent(ModelItem parent)
{
Selection selection = new Selection();
if (parent.Content.IsCollection)
{
selection = new Selection((IEnumerable)parent.Content.Collection);
}
else if (parent.Content.IsDictionary)
{
selection = new Selection((IEnumerable)parent.Content.Dictionary);
}
else if (parent.Content.IsSet && SelectionImplementation.IsSelectable(parent) && SelectionImplementation.IsSelectable(parent.Content.Value))
{
selection = new Selection(new ModelItem[1]
{
parent.Content.Value
});
}
return(selection);
}
