protected override bool ProcessCreateOrDeleteChange(EditingContext ctx, ModelToExplorerModelXRef xref, EfiChange change)
{
var artifact = change.Changed as EFArtifact;
var conceptualModel = change.Changed as ConceptualEntityModel;
var storageModel = change.Changed as StorageEntityModel;
var mappingModel = change.Changed as MappingModel;
if (null != artifact
||
null != conceptualModel
||
null != storageModel
||
null != mappingModel)
{
// reset the search results - they will no longer be valid
// once the view model is recalculated below
var explorerSearchResults = ExplorerSearchResults.GetExplorerSearchResults(ctx);
explorerSearchResults.Reset();
// reload the UI - the ExplorerViewModelChanged will be fired
// allowing the frame to rebind
CreateViewModel(ctx);
// don't process any more
return(false);
}
var efElement = change.Changed as EFElement;
// ExplorerViewModelHelper only needs to process EFElement changes
// (others are DefaultableValue and SingleItemBinding - but
// ExplorerViewModel does not currently need to map these latter)
if (null != efElement)
{
var parent = efElement.Parent as EFElement;
Debug.Assert(
null != parent,
"received changed element of type " + change.Changed.GetType().FullName + " with non-EFElement parent of type "
+ (efElement.Parent == null ? "NULL" : efElement.Parent.GetType().FullName));
if (null != parent)
{
// special case changing of an entity's key
// If we are creating/deleting a Key PropertyRef then we need
// to update the underlying ExplorerProperty
var propRef = efElement as PropertyRef;
var keyElement = efElement as Key;
if (propRef != null)
{
keyElement = propRef.GetParentOfType(typeof(Key)) as Key;
if (keyElement != null &&
null != propRef.Name &&
null != propRef.Name.Target)
{
ExplorerEFElement explorerProp =
xref.GetExisting(propRef.Name.Target) as ExplorerProperty;
if (null != explorerProp)
{
explorerProp.OnModelPropertyChanged(ExplorerEFElement.IsKeyPropertyID);
}
}
}
else if (keyElement != null)
{
// key must be a child of an entity
var et = parent as EntityType;
if (et != null)
{
// the key is being created or completely removed, so sync up every property
foreach (var prop in et.Properties())
{
ExplorerEFElement explorerProp = xref.GetExisting(prop) as ExplorerProperty;
if (null != explorerProp)
{
explorerProp.OnModelPropertyChanged(ExplorerEFElement.IsKeyPropertyID);
}
}
}
}
else
{
// find Explorer node which maps to the model's parent
// this can be null is the ViewModel does not map the
// parent object
if (typeof(FunctionImport) == efElement.GetType())
{
// the FunctionImport Explorer Parent node has been decided to be the ConceptualEntityModel ExplorerEFElement
// rather than the ConceptualEntityContainer one which we would more naturally use to match the model setup
parent = parent.Parent as EFElement;
}
var explorerParentItem = xref.GetExisting(parent);
if (null != explorerParentItem)
{
// now find the Explorer node which should be the new/deleted ViewModel element's parent
// (may not be the same as above due to Explorer ghost nodes)
explorerParentItem = explorerParentItem.GetParentNodeForElement(efElement);
if (EfiChange.EfiChangeType.Create == change.Type)
{
// It's possible that between the Create of a parent and its child
// the Children property is called on the parent which loads the
// child into the parent, even though the child is being added with
// change.Type = Create. For safety, we should remove the existing
// child (if it exists) so as to ensure any changes in the child change
// are reflected.
var explorerEFElement = xref.GetExisting(efElement);
if (explorerEFElement != null)
{
explorerParentItem.RemoveChildIfLoaded(efElement);
}
explorerParentItem.InsertChildIfLoaded(efElement);
}
else
{
explorerParentItem.RemoveChildIfLoaded(efElement);
}
}
}
}
}
return(true);
}
protected override bool ProcessCreateOrDeleteChange(EditingContext ctx, ModelToExplorerModelXRef xref, EfiChange change)
{
var artifact = change.Changed as EFArtifact;
var conceptualModel = change.Changed as ConceptualEntityModel;
var storageModel = change.Changed as StorageEntityModel;
var mappingModel = change.Changed as MappingModel;
if (null != artifact
||
null != conceptualModel
||
null != storageModel
||
null != mappingModel)
{
// reset the search results - they will no longer be valid
// once the view model is recalculated below
var explorerSearchResults = ExplorerSearchResults.GetExplorerSearchResults(ctx);
explorerSearchResults.Reset();
// reload the UI - the ExplorerViewModelChanged will be fired
// allowing the frame to rebind
CreateViewModel(ctx);
// don't process any more
return false;
}
var efElement = change.Changed as EFElement;
// ExplorerViewModelHelper only needs to process EFElement changes
// (others are DefaultableValue and SingleItemBinding - but
// ExplorerViewModel does not currently need to map these latter)
if (null != efElement)
{
var parent = efElement.Parent as EFElement;
Debug.Assert(
null != parent,
"received changed element of type " + change.Changed.GetType().FullName + " with non-EFElement parent of type "
+ (efElement.Parent == null ? "NULL" : efElement.Parent.GetType().FullName));
if (null != parent)
{
// special case changing of an entity's key
// If we are creating/deleting a Key PropertyRef then we need
// to update the underlying ExplorerProperty
var propRef = efElement as PropertyRef;
var keyElement = efElement as Key;
if (propRef != null)
{
keyElement = propRef.GetParentOfType(typeof(Key)) as Key;
if (keyElement != null
&& null != propRef.Name
&& null != propRef.Name.Target)
{
ExplorerEFElement explorerProp =
xref.GetExisting(propRef.Name.Target) as ExplorerProperty;
if (null != explorerProp)
{
explorerProp.OnModelPropertyChanged(ExplorerEFElement.IsKeyPropertyID);
}
}
}
else if (keyElement != null)
{
// key must be a child of an entity
var et = parent as EntityType;
if (et != null)
{
// the key is being created or completely removed, so sync up every property
foreach (var prop in et.Properties())
{
ExplorerEFElement explorerProp = xref.GetExisting(prop) as ExplorerProperty;
if (null != explorerProp)
{
explorerProp.OnModelPropertyChanged(ExplorerEFElement.IsKeyPropertyID);
}
}
}
}
else
{
// find Explorer node which maps to the model's parent
// this can be null is the ViewModel does not map the
// parent object
if (typeof(FunctionImport) == efElement.GetType())
{
// the FunctionImport Explorer Parent node has been decided to be the ConceptualEntityModel ExplorerEFElement
// rather than the ConceptualEntityContainer one which we would more naturally use to match the model setup
parent = parent.Parent as EFElement;
}
var explorerParentItem = xref.GetExisting(parent);
if (null != explorerParentItem)
{
// now find the Explorer node which should be the new/deleted ViewModel element's parent
// (may not be the same as above due to Explorer ghost nodes)
explorerParentItem = explorerParentItem.GetParentNodeForElement(efElement);
if (EfiChange.EfiChangeType.Create == change.Type)
{
// It's possible that between the Create of a parent and its child
// the Children property is called on the parent which loads the
// child into the parent, even though the child is being added with
// change.Type = Create. For safety, we should remove the existing
// child (if it exists) so as to ensure any changes in the child change
// are reflected.
var explorerEFElement = xref.GetExisting(efElement);
if (explorerEFElement != null)
{
explorerParentItem.RemoveChildIfLoaded(efElement);
}
explorerParentItem.InsertChildIfLoaded(efElement);
}
else
{
explorerParentItem.RemoveChildIfLoaded(efElement);
}
}
}
}
}
return true;
}