private async Task BindPlacementAsync(BuildShapeContext context, string displayType, string stereotype)
{
var theme = await _themeManager.GetThemeAsync();
var shapeTable = _shapeTableManager.GetShapeTable(theme.Id);
context.FindPlacement = (partShapeType, differentiator, defaultLocation) => {
ShapeDescriptor descriptor;
if (shapeTable.Descriptors.TryGetValue(partShapeType, out descriptor))
{
var placementContext = new ShapePlacementContext
{
Shape = context.Shape
};
// define which location should be used if none placement is hit
descriptor.DefaultPlacement = defaultLocation;
var placement = descriptor.Placement(placementContext);
if (placement != null)
{
placement.Source = placementContext.Source;
return placement;
}
}
return new PlacementInfo
{
Location = defaultLocation,
Source = String.Empty
};
};
}
private void ApplyImplementation(BuildShapeContext context, string displayType)
{
var placement = context.FindPlacement(_shapeType, _differentiator, _defaultLocation);
if (String.IsNullOrEmpty(placement.Location) || placement.Location == "-")
{
return;
}
// Parse group placement.
_groupId = placement.GetGroup();
if (!String.Equals(context.GroupId ?? "", _groupId ?? "", StringComparison.OrdinalIgnoreCase))
{
return;
}
var newShape = _shapeBuilder(context);
// Ignore it if the driver returned a null shape.
if (newShape == null)
{
return;
}
ShapeMetadata newShapeMetadata = newShape.Metadata;
newShapeMetadata.Prefix = _prefix;
newShapeMetadata.DisplayType = displayType;
newShapeMetadata.PlacementSource = placement.Source;
newShapeMetadata.Tab = placement.GetTab();
// The _processing callback is used to delay execution of costly initialization
// that can be prevented by caching
if(_processing != null)
{
newShapeMetadata.OnProcessing(_processing);
}
// Apply cache settings
if(!String.IsNullOrEmpty(_cacheId) && _cache != null)
{
_cache(newShapeMetadata.Cache(_cacheId));
}
// If a specific shape is provided, remove all previous alternates and wrappers.
if (!String.IsNullOrEmpty(placement.ShapeType))
{
newShapeMetadata.Type = placement.ShapeType;
newShapeMetadata.Alternates.Clear();
newShapeMetadata.Wrappers.Clear();
}
foreach (var alternate in placement.Alternates)
{
newShapeMetadata.Alternates.Add(alternate);
}
foreach (var wrapper in placement.Wrappers)
{
newShapeMetadata.Wrappers.Add(wrapper);
}
dynamic parentShape = context.Shape;
if(placement.IsLayoutZone())
{
parentShape = context.Layout;
}
var position = placement.GetPosition();
var zones = placement.GetZones();
foreach(var zone in zones)
{
parentShape = parentShape.Zones[zone];
}
if (String.IsNullOrEmpty(position))
{
parentShape.Add(newShape);
}
else
{
parentShape.Add(newShape, position);
}
}