org.zkoss.zhtml.impl
Class PageRenderer

java.lang.Object
  org.zkoss.zhtml.impl.PageRenderer

All Implemented Interfaces:

PageRenderer

public class PageRenderer
extends java.lang.Object
implements PageRenderer

The page render for ZHTML pages.

Since:

5.0.0

Author:

tomyeh

Constructor Summary

PageRenderer()

Method Summary

static void	afterRenderHtml(Execution exec, Page page, java.io.Writer out, java.lang.Object param) Ends and cleans up the rendering of a complete ZHTML page.
static void	afterRenderTag(Execution exec, java.lang.Object param) Ends and cleans up the rendering of a ZHTML tag.
static java.lang.Object	beforeRenderHtml(Execution exec, Page page, java.io.Writer out) Prepares for rendering a complete ZHTML page.
static java.lang.Object	beforeRenderTag(Execution exec) Prepares for rendering a ZHTML tag.
static java.lang.String	childrenToContent(Component comp) Converts the children of the give component into a string-typed content, or null if no children at all.
static TagRenderContext	getTagRenderContext(Execution exec) Returns the render context, or null if not available.
void	render(Page page, java.io.Writer out) Renders the page.
protected void	renderComplete(Execution exec, Page page, java.io.Writer out) Renders the page if Page.isComplete() is true.
protected void	renderPage(Execution exec, Page page, java.io.Writer out, boolean au) Renders the page if Page.isComplete() is false.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

PageRenderer

public PageRenderer()

Method Detail

getTagRenderContext

public static TagRenderContext getTagRenderContext(Execution exec)

Returns the render context, or null if not available. The render context is available only if the ZHTML page is rendered directly (rather than via inclusion).

Parameters:

exec - the execution. If null, Executions.getCurrent() is assumed.

render

public void render(Page page,
                   java.io.Writer out)
            throws java.io.IOException

Description copied from interface: PageRenderer

Renders the page.

Specified by:

render in interface PageRenderer

out - the output writer to put the content to (never null).

Throws:

java.io.IOException

renderPage

protected void renderPage(Execution exec,
                          Page page,
                          java.io.Writer out,
                          boolean au)
                   throws java.io.IOException

Renders the page if Page.isComplete() is false.

Parameters:

au - whether it is caused by an asynchronous update

Throws:

java.io.IOException

renderComplete

protected void renderComplete(Execution exec,
                              Page page,
                              java.io.Writer out)
                       throws java.io.IOException

Renders the page if Page.isComplete() is true. In other words, the page content contains HTML/BODY tags.

Throws:

java.io.IOException

beforeRenderHtml

public static java.lang.Object beforeRenderHtml(Execution exec,
                                                Page page,
                                                java.io.Writer out)
                                         throws java.io.IOException

Prepares for rendering a complete ZHTML page. After rendering, the caller shall also invoke afterRenderHtml(org.zkoss.zk.ui.Execution, org.zkoss.zk.ui.Page, java.io.Writer, java.lang.Object). Furthermore, the return value of this method shall be passed as the param argument of afterRenderHtml(org.zkoss.zk.ui.Execution, org.zkoss.zk.ui.Page, java.io.Writer, java.lang.Object).

Throws:

java.io.IOException

See Also:

afterRenderHtml(org.zkoss.zk.ui.Execution, org.zkoss.zk.ui.Page, java.io.Writer, java.lang.Object)

afterRenderHtml

public static void afterRenderHtml(Execution exec,
                                   Page page,
                                   java.io.Writer out,
                                   java.lang.Object param)
                            throws java.io.IOException

Ends and cleans up the rendering of a complete ZHTML page.

Parameters:

param - the value returned by beforeRenderHtml(org.zkoss.zk.ui.Execution, org.zkoss.zk.ui.Page, java.io.Writer).

Throws:

java.io.IOException

See Also:

beforeRenderHtml(org.zkoss.zk.ui.Execution, org.zkoss.zk.ui.Page, java.io.Writer)

beforeRenderTag

public static java.lang.Object beforeRenderTag(Execution exec)

Prepares for rendering a ZHTML tag. After rendering, the caller shall also invoke afterRenderTag(org.zkoss.zk.ui.Execution, java.lang.Object). Furthermore, the return value of this method shall be passed as the param argument of afterRenderTag(org.zkoss.zk.ui.Execution, java.lang.Object).

Returns:

the result of this invocation. It shall be passed to the param argument of afterRenderTag(org.zkoss.zk.ui.Execution, java.lang.Object).

See Also:

afterRenderTag(org.zkoss.zk.ui.Execution, java.lang.Object)

afterRenderTag

public static void afterRenderTag(Execution exec,
                                  java.lang.Object param)

Ends and cleans up the rendering of a ZHTML tag.

Parameters:

param - the value returned by beforeRenderHtml(org.zkoss.zk.ui.Execution, org.zkoss.zk.ui.Page, java.io.Writer).

childrenToContent

public static java.lang.String childrenToContent(Component comp)

Converts the children of the give component into a string-typed content, or null if no children at all.

Throws:

UiException - if some of the children is not ZHTML tags (i.e., not AbstractTag).

Since:

5.0.7