/// <summary>
/// The behavior is as follow:
/// Creates copy of EntityTypes and relationships between them from clipboard format in the Entity Model if:
/// - The entity-types and/or relationships do not exist in the model.
/// - The passed in diagram parameter is null.
/// OR
/// Create the associated diagram items in the Diagram Model if:
/// - The diagram is not null AND entity-types and/or relationships exist in the model AND the corresponding diagram items do not exist in the diagram.
/// </summary>
/// <param name="diagram"></param>
/// <param name="clipboardEntities"></param>
/// <param name="modelSpace"></param>
internal CopyEntitiesCommand(Diagram diagram, EntitiesClipboardFormat clipboardEntities, ModelSpace modelSpace)
{
_diagram = diagram;
_clipboardEntities = clipboardEntities;
_modelSpace = modelSpace;
}
/// <summary>
/// Creates a copy of EntityTypes and relationships between them from clipboard format
/// </summary>
/// <param name="property"></param>
internal CopyEntitiesCommand(EntitiesClipboardFormat clipboardEntities, ModelSpace modelSpace)
: this(null, clipboardEntities, modelSpace)
{
_clipboardEntities = clipboardEntities;
_modelSpace = modelSpace;
}
/// <summary>
/// Loop through Clipboard objects and determine whether there are EFObject that should be in the diagram but are not.
/// </summary>
/// <param name="clipboardObjects"></param>
/// <returns></returns>
private IList<EFElement> GetEFElementNotInDiagramFromClipboardObject(EntitiesClipboardFormat clipboardObjects)
{
var modelDiagram = ModelElement.ModelXRef.GetExisting(this) as ModelDiagram;
var artifactSet = modelDiagram.Artifact.ArtifactSet;
IList<EFElement> efElements = new List<EFElement>();
// We are only interested in entity-types all the associations will be automatically created when entity-types are added to diagram.
foreach (var clipboardObject in clipboardObjects.ClipboardEntities)
{
var efElement = artifactSet.LookupSymbol(clipboardObject.NormalizedName);
if (efElement != null
&& modelDiagram.IsEFObjectRepresentedInDiagram(efElement) == false)
{
efElements.Add(efElement);
}
}
return efElements;
}
/// <summary>
/// OnDragLeave ensure that the _clipboardObject is cleared.
/// </summary>
/// <param name="e"></param>
public override void OnDragLeave(DiagramPointEventArgs e)
{
_clipboardObjects = null;
base.OnDragLeave(e);
}
/// <summary>
/// The even handler when ojbects are dragged over the designer.
/// </summary>
/// <param name="e"></param>
public override void OnDragEnter(DiagramDragEventArgs e)
{
// Depending on type of objects are being dragged, display the appropriate icons.
_clipboardObjects = GetClipboardObjectFromDragEventArgs(e);
if (_clipboardObjects != null)
{
e.Effect = GetDropEffects();
e.Handled = true;
}
else
{
base.OnDragEnter(e);
}
}
/// <summary>
/// The event handler when objects are dropped to the designer.
/// If clipboard object is not null, we will go through the objects in the clipboard object and create appropriate Escher objects.
/// </summary>
/// <param name="e"></param>
public override void OnDragDrop(DiagramDragEventArgs e)
{
try
{
Arranger.Start(e.IsDropLocationUserSpecified ? e.MousePosition : PointD.Empty);
if (_clipboardObjects != null)
{
var modelDiagram = ModelElement.ModelXRef.GetExisting(this) as ModelDiagram;
var cpc = new CommandProcessorContext(
ModelElement.EditingContext, EfiTransactionOriginator.EntityDesignerOriginatorId, EntityDesignerResources.Tx_DropItems);
CommandProcessor.InvokeSingleCommand(
cpc,
new CreateDiagramItemForEFElementsCommand(
GetEFElementNotInDiagramFromClipboardObject(_clipboardObjects),
modelDiagram, e.Shift || e.Control));
}
else
{
base.OnDragDrop(e);
}
}
finally
{
_clipboardObjects = null;
Arranger.End();
if (e.IsDropLocationUserSpecified == false)
{
EnsureSelectionVisible();
}
}
}