public virtual void Displaying(ShapeDisplayingContext context)
{
}
public IHtmlString Execute(DisplayContext context)
{
var shape = _convertAsShapeCallsite.Target(_convertAsShapeCallsite, context.Value);
// non-shape arguments are returned as a no-op
if (shape == null)
{
return(CoerceHtmlString(context.Value));
}
var shapeMetadata = shape.Metadata;
// can't really cope with a shape that has no type information
if (shapeMetadata == null || string.IsNullOrEmpty(shapeMetadata.Type))
{
return(CoerceHtmlString(context.Value));
}
var workContext = _workContextAccessor.GetContext();
// CurrentTheme is now available in the background, so here we no longer use IsBackgroundContext().
// We only do a null check, so we can render in the background a view that only exists in the theme.
var shapeTable = _httpContextAccessor.Current() != null
? _shapeTableLocator.Value.Lookup(workContext.CurrentTheme.Id)
: _shapeTableLocator.Value.Lookup(null);
var displayingContext = new ShapeDisplayingContext
{
Shape = shape,
ShapeMetadata = shapeMetadata
};
_shapeDisplayEvents.Invoke(sde => sde.Displaying(displayingContext), Logger);
// find base shape association using only the fundamental shape type.
// alternates that may already be registered do not affect the "displaying" event calls
ShapeBinding shapeBinding;
if (TryGetDescriptorBinding(shapeMetadata.Type, Enumerable.Empty <string>(), shapeTable, out shapeBinding))
{
shapeBinding.ShapeDescriptor.Displaying.Invoke(action => action(displayingContext), Logger);
// copy all binding sources (all templates for this shape) in order to use them as Localization scopes
shapeMetadata.BindingSources = shapeBinding.ShapeDescriptor.BindingSources.Where(x => x != null).ToList();
if (!shapeMetadata.BindingSources.Any())
{
shapeMetadata.BindingSources.Add(shapeBinding.ShapeDescriptor.BindingSource);
}
}
// invoking ShapeMetadata displaying events
shapeMetadata.Displaying.Invoke(action => action(displayingContext), Logger);
// use pre-fectched content if available (e.g. coming from specific cache implmentation)
if (displayingContext.ChildContent != null)
{
shape.Metadata.ChildContent = displayingContext.ChildContent;
}
else
{
// now find the actual binding to render, taking alternates into account
ShapeBinding actualBinding;
if (TryGetDescriptorBinding(shapeMetadata.Type, shapeMetadata.Alternates, shapeTable, out actualBinding))
{
shape.Metadata.ChildContent = Process(actualBinding, shape, context);
}
else
{
throw new BoyingException(T("Shape type {0} not found", shapeMetadata.Type));
}
}
foreach (var frameType in shape.Metadata.Wrappers)
{
ShapeBinding frameBinding;
if (TryGetDescriptorBinding(frameType, Enumerable.Empty <string>(), shapeTable, out frameBinding))
{
shape.Metadata.ChildContent = Process(frameBinding, shape, context);
}
}
var displayedContext = new ShapeDisplayedContext
{
Shape = shape,
ShapeMetadata = shape.Metadata,
ChildContent = shape.Metadata.ChildContent,
};
_shapeDisplayEvents.Invoke(sde =>
{
var prior = displayedContext.ChildContent = displayedContext.ShapeMetadata.ChildContent;
sde.Displayed(displayedContext);
// update the child content if the context variable has been reassigned
if (prior != displayedContext.ChildContent)
{
displayedContext.ShapeMetadata.ChildContent = displayedContext.ChildContent;
}
}, Logger);
if (shapeBinding != null)
{
shapeBinding.ShapeDescriptor.Displayed.Invoke(action =>
{
var prior = displayedContext.ChildContent = displayedContext.ShapeMetadata.ChildContent;
action(displayedContext);
// update the child content if the context variable has been reassigned
if (prior != displayedContext.ChildContent)
{
displayedContext.ShapeMetadata.ChildContent = displayedContext.ChildContent;
}
}, Logger);
}
// invoking ShapeMetadata displayed events
shapeMetadata.Displayed.Invoke(action => action(displayedContext), Logger);
return(shape.Metadata.ChildContent);
}