public IEnumerable <object> GetViewsWithNamePrefix(string viewNamePrefix)
{
// just to check the parameter and throw the correct exception message obtained from the superclass resources.
object dummy = GetView(viewNamePrefix);
return(ItemMetadataCollection.Where(x => x.Name.StartsWith(viewNamePrefix)).Select(metadata => metadata.Item));
}
/// <summary>
/// Removes the specified view from the region.
/// </summary>
/// <param name="view">The view to remove.</param>
public virtual void Remove(object view)
{
ItemMetadata itemMetadata = GetItemMetadataOrThrow(view);
ItemMetadataCollection.Remove(itemMetadata);
DependencyObject dependencyObject = view as DependencyObject;
if (dependencyObject != null && Regions.RegionManager.GetRegionManager(dependencyObject) == this.RegionManager)
{
dependencyObject.ClearValue(Regions.RegionManager.RegionManagerProperty);
}
}
/// <summary>
/// Returns the view instance that was added to the region using a specific name.
/// </summary>
/// <param name="viewName">The name used when adding the view to the region.</param>
/// <returns>Returns the named view or <see langword="null"/> if the view with <paramref name="viewName"/> does not exist in the current region.</returns>
public virtual object GetView(string viewName)
{
if (string.IsNullOrEmpty(viewName))
{
throw new ArgumentException(string.Format(CultureInfo.CurrentCulture, Resources.StringCannotBeNullOrEmpty, "viewName"));
}
ItemMetadata metadata = ItemMetadataCollection.FirstOrDefault(x => x.Name == viewName);
if (metadata != null)
{
return(metadata.Item);
}
return(null);
}
private void ItemMetadataCollectionInsert(int index, PreferredPositionItemMetadata itemMetadata)
{
var nToKeep = index; // left
var nToRemove = ItemMetadataCollection.Count - nToKeep; // right
Debug.Assert(ItemMetadataCollection.Count == nToRemove + nToKeep);
var backup = new List <ItemMetadata>(nToRemove);
backup.AddRange(ItemMetadataCollection.Skip(nToKeep)); // save the left part
for (int i = 1; i <= nToRemove; i++) // remove the right part
{
ItemMetadataCollection.RemoveAt(ItemMetadataCollection.Count - 1); // remove last view
}
ItemMetadataCollection.Add(itemMetadata); // append after the left part
ItemMetadataCollection.AddRange(backup); // restore the right part
}
private void InnerAdd(PreferredPositionNamedView namedview, IRegionManager scopedRegionManager)
{
object view = (namedview.m_viewInstance ?? namedview.m_viewInstanceProvider());
if (this.ItemMetadataCollection.FirstOrDefault(x => x.Item == view) != null)
{
throw new InvalidOperationException("RegionViewExistsException");
}
PreferredPositionItemMetadata itemMetadata = new PreferredPositionItemMetadata(view);
if (!string.IsNullOrEmpty(namedview.m_viewName))
{
if (this.ItemMetadataCollection.FirstOrDefault(x => x.Name == namedview.m_viewName) != null)
{
throw new InvalidOperationException(String.Format(CultureInfo.InvariantCulture, "RegionViewNameExistsException: {0}", namedview.m_viewName));
}
itemMetadata.Name = namedview.m_viewName;
}
itemMetadata.PreferredPosition = namedview.m_viewPreferredPosition;
DependencyObject dependencyObject = view as DependencyObject;
if (dependencyObject != null)
{
Microsoft.Practices.Composite.Presentation.Regions.RegionManager.SetRegionManager(dependencyObject, scopedRegionManager);
}
#if true || DEBUG
if (MARK_PREFERRED_POS)
{
markWithAddIndex(itemMetadata);
}
#endif
int initialCount = ItemMetadataCollection.Count;
bool isSeparator = itemMetadata.Item is Separator
#if true || DEBUG
|| MARK_PREFERRED_POS && !(itemMetadata.Item is MenuItemRichCommand) && itemMetadata.Item is MenuItem
#endif
;
switch (itemMetadata.PreferredPosition)
{
case PreferredPosition.First:
{
var lastItemWithFirstPreferredPosition = ItemMetadataCollection.LastOrDefault(item =>
{
var positionedItem = item as PreferredPositionItemMetadata;
if (positionedItem == null)
{
Debug.Fail(@"This should never happen !! (not a PreferredPositionItemMetadata in PreferredPositionRegion)");
return(false);
}
return(positionedItem.PreferredPosition == PreferredPosition.First);
});
// No First in the current list of views for this region
if (lastItemWithFirstPreferredPosition == null)
{
if (isSeparator)
{
break; // the following views will be inserted as the very first ones, no need for separation
}
if (ItemMetadataCollection.Count == 0)
{
ItemMetadataCollection.Add(itemMetadata);
#if true || DEBUG
if (MARK_PREFERRED_POS)
{
ItemMetadataCollectionCheckPreferredPositions();
}
#endif
}
else
{
//ItemMetadataCollection.Insert(0, itemMetadata);
//ItemMetadataCollectionInsert(0, itemMetadata);
var backup = new List <ItemMetadata>(initialCount);
while (ItemMetadataCollection.Count > 0)
{
var toRemove = ItemMetadataCollection.First();
ItemMetadataCollection.Remove(toRemove);
backup.Add(toRemove);
}
ItemMetadataCollection.Add(itemMetadata);
ItemMetadataCollection.AddRange(backup);
#if true || DEBUG
if (MARK_PREFERRED_POS)
{
ItemMetadataCollectionCheckPreferredPositions();
}
#endif
}
Debug.Assert(ItemMetadataCollection.Count == initialCount + 1);
}
else // we found the last view with position == First
{
int index = ItemMetadataCollection.IndexOf(lastItemWithFirstPreferredPosition);
// All the current views are First, so we append the new view (note: could be a Separator)
// i.e. the first view to be registered as First is guaranteed to take precedence over the ones that come after.
if (index == ItemMetadataCollection.Count - 1)
{
ItemMetadataCollection.Add(itemMetadata);
#if true || DEBUG
if (MARK_PREFERRED_POS)
{
ItemMetadataCollectionCheckPreferredPositions();
}
#endif
}
else // there are Any or Last views after the last First one.
{
//ItemMetadataCollection.Insert(index + 1, itemMetadata);
ItemMetadataCollectionInsert(index + 1, itemMetadata);
#if true || DEBUG
if (MARK_PREFERRED_POS)
{
ItemMetadataCollectionCheckPreferredPositions();
}
#endif
}
Debug.Assert(ItemMetadataCollection.Count == initialCount + 1);
}
break;
}
case PreferredPosition.Last:
{
var lastItemWithLastPreferredPosition = ItemMetadataCollection.LastOrDefault(item =>
{
var positionedItem = item as PreferredPositionItemMetadata;
if (positionedItem == null)
{
Debug.Fail(@"This should never happen !! (not a PreferredPositionItemMetadata in PreferredPositionRegion)");
return(false);
}
return(positionedItem.PreferredPosition == PreferredPosition.Last);
});
// No Last in the current list of views for this region
if (lastItemWithLastPreferredPosition == null)
{
ItemMetadataCollection.Add(itemMetadata); // could be a separator
#if true || DEBUG
if (MARK_PREFERRED_POS)
{
ItemMetadataCollectionCheckPreferredPositions();
}
#endif
}
else // we found the last view with position == Last
{
int index = ItemMetadataCollection.IndexOf(lastItemWithLastPreferredPosition);
if (index == ItemMetadataCollection.Count - 1)
{
ItemMetadataCollection.Add(itemMetadata); // could be a separator
#if true || DEBUG
if (MARK_PREFERRED_POS)
{
ItemMetadataCollectionCheckPreferredPositions();
}
#endif
}
else
{
Debug.Fail("No First or Any should follow a Last !!");
////ItemMetadataCollection.Insert(index + 1, itemMetadata);
//ItemMetadataCollectionInsert(index + 1, itemMetadata);
}
}
Debug.Assert(ItemMetadataCollection.Count == initialCount + 1);
break;
}
case PreferredPosition.Any:
{
var firstItemWithLastPreferredPosition = ItemMetadataCollection.FirstOrDefault(item =>
{
var positionedItem = item as PreferredPositionItemMetadata;
if (positionedItem == null)
{
Debug.Fail(@"This should never happen !! (not a PreferredPositionItemMetadata in PreferredPositionRegion)");
return(false);
}
return(positionedItem.PreferredPosition == PreferredPosition.Last);
});
// No Last in the current list of views for this region
if (firstItemWithLastPreferredPosition == null)
{
ItemMetadataCollection.Add(itemMetadata); // could be a separator
#if true || DEBUG
if (MARK_PREFERRED_POS)
{
ItemMetadataCollectionCheckPreferredPositions();
}
#endif
}
else
{
int index = ItemMetadataCollection.IndexOf(firstItemWithLastPreferredPosition);
// ItemMetadataCollection.Insert(index, itemMetadata);
ItemMetadataCollectionInsert(index, itemMetadata);
#if true || DEBUG
if (MARK_PREFERRED_POS)
{
ItemMetadataCollectionCheckPreferredPositions();
}
#endif
}
break;
}
}
}
