org.apache.tapestry5.runtime
Interface Component

All Superinterfaces:

ComponentResourcesAware

public interface Component
extends ComponentResourcesAware

Interface that defines the lifecycle of a component, within a page, allowing for callbacks into the component for many different events. This interface is part of the public API for Tapestry, but is not expected to be directly implemented by component classes; it should only be implemented as part of the component class transformation process.

Most of the methods are related to render phases; see the corresponding annotations and component rendering documentation to see how they relate to each other.

Starting in 5.3 this interface no longer implements PageLifecycleListener. Normally, this would be an incompatible change, but Component is not supposed to be directly implemented by user code.

Method Summary

void	afterRender(MarkupWriter writer, Event event) Generally used to write the close tag matching any open tag written by beginRender(org.apache.tapestry5.MarkupWriter, Event).
void	afterRenderBody(MarkupWriter writer, Event event) Invoked just after rendering the body of the component.
void	afterRenderTemplate(MarkupWriter writer, Event event) Invoked after rendering the template for a component (only for components with a template).
void	beforeRenderBody(MarkupWriter writer, Event event) Invoked just before rendering the body of component.
void	beforeRenderTemplate(MarkupWriter writer, Event event) This phase is only invoked for components with templates.
void	beginRender(MarkupWriter writer, Event event) Invoked to allow a component to render its tag (start tag and attributes).
void	cleanupRender(MarkupWriter writer, Event event) Generally used to perform final cleanup of the component after rendering.
boolean	dispatchComponentEvent(ComponentEvent event) Invoked to handle a component event.
void	postRenderCleanup() Lifecycle method invoked at the end of the CleanupRender render phase.
void	setupRender(MarkupWriter writer, Event event) Invoked before rendering a component (or its template).

Methods inherited from interface org.apache.tapestry5.runtime.ComponentResourcesAware

getComponentResources

Method Detail

postRenderCleanup

void postRenderCleanup()

Lifecycle method invoked at the end of the CleanupRender render phase. There is no annotation for this method, it is part of CleanupRender, but is always invoked. Its specific use is to allow components to clean up cached parameter values.

setupRender

void setupRender(MarkupWriter writer,
                 Event event)

Invoked before rendering a component (or its template).

beginRender

void beginRender(MarkupWriter writer,
                 Event event)

Invoked to allow a component to render its tag (start tag and attributes).

beforeRenderTemplate

void beforeRenderTemplate(MarkupWriter writer,
                          Event event)

This phase is only invoked for components with templates.

afterRenderTemplate

void afterRenderTemplate(MarkupWriter writer,
                         Event event)

Invoked after rendering the template for a component (only for components with a template).

beforeRenderBody

void beforeRenderBody(MarkupWriter writer,
                      Event event)

Invoked just before rendering the body of component.

afterRenderBody

void afterRenderBody(MarkupWriter writer,
                     Event event)

Invoked just after rendering the body of the component.

afterRender

void afterRender(MarkupWriter writer,
                 Event event)

Generally used to write the close tag matching any open tag written by beginRender(org.apache.tapestry5.MarkupWriter, Event).

cleanupRender

void cleanupRender(MarkupWriter writer,
                   Event event)

Generally used to perform final cleanup of the component after rendering.

dispatchComponentEvent

boolean dispatchComponentEvent(ComponentEvent event)

Invoked to handle a component event. Methods with the OnEvent annotation (or the matching naming convention) will be invoked until one returns a non-null value.

Parameters:

event -

Returns:

true if any handler was found (and invoked), false otherwise

Throws:

RuntimeException - wrapping any checked exceptions that are thrown by individual event handler methods