internal void InitializeServices()
{
string servicesAttribute = (string)Document.Body.GetAttribute("data-services");
if (String.IsNullOrEmpty(servicesAttribute))
{
return;
}
string[] serviceNames = servicesAttribute.Split(",");
int serviceCount = serviceNames.Length;
if (serviceCount != 0)
{
for (int i = 0; i < serviceCount; i++)
{
string name = serviceNames[i];
ServiceRegistration registration = _registeredServices[name];
Debug.Assert(registration != null, "Unknown service '" + name + "'");
object service = GetObject(registration.ServiceImplementationType);
IService initializableService = service as IService;
if (initializableService != null)
{
Dictionary <string, object> options = OptionsParser.GetOptions(Document.Body, name);
initializableService.Initialize(options);
}
RegisterObject(registration.ServiceType, service);
}
}
}
/// <summary>
/// Creates and attaches behaviors specified on the element declaratively.
/// </summary>
/// <param name="element">The element whose behaviors should be created and attached.</param>
private void AttachBehaviors(Element element)
{
string[] behaviorNames = ((string)element.GetAttribute(Application.BehaviorsAttribute)).Split(",");
int behaviorCount = behaviorNames.Length;
for (int i = 0; i < behaviorCount; i++)
{
string name = behaviorNames[i].Trim();
BehaviorRegistration registration = _registeredBehaviors[name];
Debug.Assert(registration != null, "Unknown behavior '" + name + "'");
if (registration != null)
{
Dictionary <string, object> options = OptionsParser.GetOptions(element, name);
// Use the Application's IoC capabilities to create behaviors.
// This allows satisfying dependencies behaviors have to other services,
// and also allows behaviors to provide or register services into the container.
Behavior behavior = (Behavior)GetObject(registration.BehaviorType);
behavior.Initialize(element, options);
if (registration.ServiceType != null)
{
// Special-case the common case where a behavior represents a single
// service type, and auto-register it.
// In the case where a behavior is registering multiple service types
// (not so common), it can do so manually in its Initialize method.
RegisterObject(registration.ServiceType, behavior);
}
}
}
}
/// <summary>
/// Gets a template instance from the specified template name. The specified name
/// is used to lookup a script element with a matching id.
/// </summary>
/// <param name="name">The name to lookup a template.</param>
/// <returns>The template instance if the associated element could be found and successfully parsed.</returns>
public Template GetTemplate(string name)
{
Debug.Assert(String.IsNullOrEmpty(name) == false);
// TODO: Should we allow plugging in a template selector callback?
// We would need to have a value parameter to pass in the data value into GetTemplate.
// Check if there is a previously parsed or registered template
Template template = _registeredTemplates[name];
if (template != null)
{
return(template);
}
Element templateElement = Document.GetElementById(name);
Debug.Assert(templateElement != null, "Could not find a template element with the id '" + name + "'.");
if (templateElement == null)
{
return(null);
}
// Parse the template using the associated template engine
string templateType = (string)templateElement.GetAttribute(TemplateTypeAttribute);
Debug.Assert(String.IsNullOrEmpty(templateType) == false, "A template must have a valid data-template attribute set.");
template = CompileTemplate(templateType,
templateElement.TextContent,
OptionsParser.GetOptions(templateElement, TemplateOptionsAttribute));
// Cache the newly parsed template for future use
_registeredTemplates[name] = template;
return(template);
}
private void SetupServices()
{
string servicesAttribute = (string)Document.Body.GetAttribute(ServicesAttribute);
if (String.IsNullOrEmpty(servicesAttribute))
{
return;
}
string[] serviceNames = servicesAttribute.Split(",");
int serviceCount = serviceNames.Length;
for (int i = 0; i < serviceCount; i++)
{
string name = serviceNames[i];
ServiceRegistration registration = _registeredServices[name];
Debug.Assert(registration != null, "Unknown service '" + name + "'");
// TODO: Add support for deferred loading of service implementation, where
// the service gets included later, even though it is declared at the
// page level.
object service = GetObject(registration.ServiceImplementationType);
IInitializable initializableService = service as IInitializable;
if (initializableService != null)
{
Dictionary <string, object> options = OptionsParser.GetOptions(Document.Body, name);
initializableService.BeginInitialization(options);
initializableService.EndInitialization();
}
RegisterObject(registration.ServiceType, service);
}
}
/// <summary>
/// Activates a specified element and its children by instantiating any
/// declaratively specified behaviors or bindings within the markup.
/// </summary>
/// <param name="element">The element to activate.</param>
/// <param name="contentOnly">Whether the element should be activated, or only its contained content.</param>
/// <param name="model">The model to bind to.</param>
public void ActivateFragment(Element element, bool contentOnly, object model)
{
Debug.Assert(element != null);
if (element == Document.Body)
{
// Perform app-level activation (tied to body initialization)
// Setup top-level services specified declaratively.
SetupServices();
// Create the model declaratively associated with the application.
if (model == null)
{
string modelTypeName = (string)Document.Body.GetAttribute(ModelTypeAttribute);
if (String.IsNullOrEmpty(modelTypeName) == false)
{
Type modelType = Type.GetType(modelTypeName);
Debug.Assert(modelType != null, "Could not resolve model '" + modelTypeName + "'");
model = GetObject(modelType);
IInitializable initializableModel = model as IInitializable;
if (initializableModel != null)
{
Dictionary <string, object> modelData = OptionsParser.GetOptions(element, "model");
initializableModel.BeginInitialization(modelData);
initializableModel.EndInitialization();
}
}
}
_model = model;
}
// Create expressions and bindings associated with the specified elements and
// the contained elements. Do this first, as this allows behaviors to look at
// values set as a result of bindings when they are attached.
if ((contentOnly == false) && element.HasAttribute(Application.BindingsAttribute))
{
SetupBindings(element, model);
}
ElementCollection boundElements = element.QuerySelectorAll(Application.BindingsSelector);
for (int i = 0, boundElementCount = boundElements.Length; i < boundElementCount; i++)
{
SetupBindings(boundElements[i], model);
}
// Attach behaviors associated declaratively with the specified element and the
// contained elements.
if ((contentOnly == false) && element.HasAttribute(Application.BehaviorsAttribute))
{
AttachBehaviors(element);
}
ElementCollection extendedElements = element.QuerySelectorAll(Application.BehaviorsSelector);
for (int i = 0, extendedElementCount = extendedElements.Length; i < extendedElementCount; i++)
{
AttachBehaviors(extendedElements[i]);
}
}