public async Task <IHtmlContent> ExecuteAsync(DisplayContext context)
{
var shape = context.Value as IShape;
// 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 displayContext = new ShapeDisplayContext
{
Shape = shape,
ShapeMetadata = shapeMetadata,
DisplayContext = context,
ServiceProvider = _serviceProvider
};
try
{
var theme = await _themeManager.GetThemeAsync();
var shapeTable = _shapeTableManager.GetShapeTable(theme?.Id);
// Use the same prefix as the shape
var originalHtmlFieldPrefix = context.ViewContext.ViewData.TemplateInfo.HtmlFieldPrefix;
context.ViewContext.ViewData.TemplateInfo.HtmlFieldPrefix = shapeMetadata.Prefix ?? "";
// Evaluate global Shape Display Events
await _shapeDisplayEvents.InvokeAsync(sde => sde.DisplayingAsync(displayContext), _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))
{
await shapeBinding.ShapeDescriptor.DisplayingAsync.InvokeAsync(action => action(displayContext), _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(displayContext), _logger);
// use pre-fectched content if available (e.g. coming from specific cache implementation)
if (displayContext.ChildContent != null)
{
shape.Metadata.ChildContent = displayContext.ChildContent;
}
if (shape.Metadata.ChildContent == null)
{
// There might be no shape binding for the main shape, and only for its alternates.
if (shapeBinding != null)
{
await shapeBinding.ShapeDescriptor.ProcessingAsync.InvokeAsync(action => action(displayContext), _logger);
}
// now find the actual binding to render, taking alternates into account
ShapeBinding actualBinding;
if (TryGetDescriptorBinding(shapeMetadata.Type, shapeMetadata.Alternates, shapeTable, out actualBinding))
{
// invoking ShapeMetadata processing events, this includes the Drivers results
await shapeMetadata.ProcessingAsync.InvokeAsync(processing => processing(displayContext.Shape), _logger);
shape.Metadata.ChildContent = await ProcessAsync(actualBinding, shape, context);
}
else
{
throw new Exception($"Shape type '{shapeMetadata.Type}' not found");
}
}
// Process wrappers
if (shape.Metadata.Wrappers.Count > 0)
{
foreach (var frameType in shape.Metadata.Wrappers)
{
ShapeBinding frameBinding;
if (TryGetDescriptorBinding(frameType, Enumerable.Empty <string>(), shapeTable, out frameBinding))
{
shape.Metadata.ChildContent = await ProcessAsync(frameBinding, shape, context);
}
}
// Clear wrappers to prevent the child content from rendering them again
shape.Metadata.Wrappers.Clear();
}
await _shapeDisplayEvents.InvokeAsync(async sde =>
{
var prior = displayContext.ChildContent = displayContext.ShapeMetadata.ChildContent;
await sde.DisplayedAsync(displayContext);
// update the child content if the context variable has been reassigned
if (prior != displayContext.ChildContent)
{
displayContext.ShapeMetadata.ChildContent = displayContext.ChildContent;
}
}, _logger);
if (shapeBinding != null)
{
await shapeBinding.ShapeDescriptor.DisplayedAsync.InvokeAsync(async action =>
{
var prior = displayContext.ChildContent = displayContext.ShapeMetadata.ChildContent;
await action(displayContext);
// update the child content if the context variable has been reassigned
if (prior != displayContext.ChildContent)
{
displayContext.ShapeMetadata.ChildContent = displayContext.ChildContent;
}
}, _logger);
}
// invoking ShapeMetadata displayed events
shapeMetadata.Displayed.Invoke(action => action(displayContext), _logger);
//restore original HtmlFieldPrefix
context.ViewContext.ViewData.TemplateInfo.HtmlFieldPrefix = originalHtmlFieldPrefix;
}
finally
{
await _shapeDisplayEvents.InvokeAsync(sde => sde.DisplayingFinalizedAsync(displayContext), _logger);
}
return(shape.Metadata.ChildContent);
}
public async Task <IHtmlContent> ExecuteAsync(DisplayContext context)
{
var shape = context.Value as IShape;
// 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));
}
// Copy the current context such that the rendering can customize it if necessary
// For instance to change the HtmlFieldPrefix
var localContext = new DisplayContext(context);
localContext.HtmlFieldPrefix = shapeMetadata.Prefix ?? "";
var displayContext = new ShapeDisplayContext
{
Shape = shape,
DisplayContext = localContext,
ServiceProvider = _serviceProvider
};
try
{
var theme = await _themeManager.GetThemeAsync();
var shapeTable = _shapeTableManager.GetShapeTable(theme?.Id);
// Evaluate global Shape Display Events
await _shapeDisplayEvents.InvokeAsync((e, displayContext) => e.DisplayingAsync(displayContext), displayContext, _logger);
// Find base shape association using only the fundamental shape type.
// Alternates that may already be registered do not affect the "displaying" event calls.
var shapeDescriptor = GetShapeDescriptor(shapeMetadata.Type, shapeTable);
if (shapeDescriptor != null)
{
await shapeDescriptor.DisplayingAsync.InvokeAsync((action, displayContext) => action(displayContext), displayContext, _logger);
// copy all binding sources (all templates for this shape) in order to use them as Localization scopes
shapeMetadata.BindingSources = shapeDescriptor.BindingSources.Where(x => x != null).ToList();
if (!shapeMetadata.BindingSources.Any())
{
shapeMetadata.BindingSources.Add(shapeDescriptor.BindingSource);
}
}
// invoking ShapeMetadata displaying events
shapeMetadata.Displaying.Invoke(action => action(displayContext), _logger);
// use pre-fetched content if available (e.g. coming from specific cache implementation)
if (displayContext.ChildContent != null)
{
shape.Metadata.ChildContent = displayContext.ChildContent;
}
if (shape.Metadata.ChildContent == null)
{
// There might be no shape binding for the main shape, and only for its alternates.
if (shapeDescriptor != null)
{
await shapeDescriptor.ProcessingAsync.InvokeAsync((action, displayContext) => action(displayContext), displayContext, _logger);
}
// now find the actual binding to render, taking alternates into account
var actualBinding = await GetShapeBindingAsync(shapeMetadata.Type, shapeMetadata.Alternates, shapeTable);
if (actualBinding != null)
{
await shapeMetadata.ProcessingAsync.InvokeAsync((action, displayContext) => action(displayContext.Shape), displayContext, _logger);
shape.Metadata.ChildContent = await ProcessAsync(actualBinding, shape, localContext);
}
else
{
throw new Exception($"Shape type '{shapeMetadata.Type}' not found");
}
}
// Process wrappers
if (shape.Metadata.Wrappers.Count > 0)
{
foreach (var frameType in shape.Metadata.Wrappers)
{
var frameBinding = await GetShapeBindingAsync(frameType, AlternatesCollection.Empty, shapeTable);
if (frameBinding != null)
{
shape.Metadata.ChildContent = await ProcessAsync(frameBinding, shape, localContext);
}
}
// Clear wrappers to prevent the child content from rendering them again
shape.Metadata.Wrappers.Clear();
}
await _shapeDisplayEvents.InvokeAsync(async (e, displayContext) =>
{
var prior = displayContext.ChildContent = displayContext.Shape.Metadata.ChildContent;
await e.DisplayedAsync(displayContext);
// update the child content if the context variable has been reassigned
if (prior != displayContext.ChildContent)
{
displayContext.Shape.Metadata.ChildContent = displayContext.ChildContent;
}
}, displayContext, _logger);
if (shapeDescriptor != null)
{
await shapeDescriptor.DisplayedAsync.InvokeAsync(async (action, displayContext) =>
{
var prior = displayContext.ChildContent = displayContext.Shape.Metadata.ChildContent;
await action(displayContext);
// update the child content if the context variable has been reassigned
if (prior != displayContext.ChildContent)
{
displayContext.Shape.Metadata.ChildContent = displayContext.ChildContent;
}
}, displayContext, _logger);
}
// invoking ShapeMetadata displayed events
shapeMetadata.Displayed.Invoke((action, displayContext) => action(displayContext), displayContext, _logger);
}
finally
{
await _shapeDisplayEvents.InvokeAsync((e, displayContext) => e.DisplayingFinalizedAsync(displayContext), displayContext, _logger);
}
return(shape.Metadata.ChildContent);
}
