org.zkoss.zhtml
Class Zkhead

java.lang.Object
  org.zkoss.zk.ui.AbstractComponent
      org.zkoss.zhtml.Zkhead

All Implemented Interfaces:

java.io.Serializable, java.lang.Cloneable, Component, Scope, ComponentCtrl

public class Zkhead
extends AbstractComponent

The component used to generate CSS and JavaScrpt declarations. By default, CSS and JavaScript declarations are generated automatically (right before </head>). However, if you prefer to generate them in the particular location, you can use this tag.

Since:

3.5.0

Author:

tomyeh

See Also:

Serialized Form

Nested Class Summary

protected class

Zkhead.ExtraCtrl

Nested classes/interfaces inherited from class org.zkoss.zk.ui.AbstractComponent

AbstractComponent.Children

Field Summary

Fields inherited from interface org.zkoss.zk.ui.Component

APPLICATION_SCOPE, COMPONENT_SCOPE, DESKTOP_SCOPE, PAGE_SCOPE, REQUEST_SCOPE, SESSION_SCOPE, SPACE_SCOPE

Fields inherited from interface org.zkoss.zk.ui.sys.ComponentCtrl

CE_BUSY_IGNORE, CE_DUPLICATE_IGNORE, CE_IMPORTANT, CE_NON_DEFERRABLE, CE_REPEAT_IGNORE

Constructor Summary

Zkhead()

Method Summary

java.lang.Object	getExtraCtrl() Returns the extra controls that tell ZK how to handle this component specially.
void	redraw(java.io.Writer out) Redraws this component and all its descendants.

Methods inherited from class org.zkoss.zk.ui.AbstractComponent

addAnnotation, addAnnotation, addClientEvent, addEventHandler, addEventListener, addEventListener, addForward, addForward, addForward, addForward, addMoved, addRedrawCallback, addScopeListener, addShadowRoot, addShadowRootBefore, addSharedEventHandlerMap, appendChild, applyProperties, beforeChildAdded, beforeChildRemoved, beforeParentChanged, clone, detach, didActivate, didActivate, didDeserialize, didDeserialize, disableBindingAnnotation, disableClientUpdate, enableBindingAnnotation, equals, getAnnotatedProperties, getAnnotatedPropertiesBy, getAnnotation, getAnnotation, getAnnotations, getAnnotations, getAnnotations, getAttribute, getAttribute, getAttribute, getAttributeOrFellow, getAttributes, getAttributes, getAuService, getAutag, getChildren, getClientAttribute, getClientEvents, getDefaultMold, getDefinition, getDesktop, getEventHandler, getEventHandlerNames, getEventListenerMap, getEventListeners, getFellow, getFellow, getFellowIfAny, getFellowIfAny, getFellows, getFirstChild, getId, getLastChild, getListenerIterator, getMold, getNextSibling, getPage, getParent, getPreviousSibling, getRedrawCallback, getRoot, getShadowRoots, getShadowVariable, getShadowVariable0, getSpaceOwner, getSpecialRendererOutput, getStubonly, getSubBindingAnnotationCount, getTemplate, getTemplateNames, getUuid, getWidgetAttribute, getWidgetAttributeNames, getWidgetClass, getWidgetListener, getWidgetListenerNames, getWidgetOverride, getWidgetOverrideNames, hasAttribute, hasAttribute, hasAttribute, hasAttributeOrFellow, hasBindingAnnotation, hasFellow, hasFellow, hasSubBindingAnnotation, insertBefore, invalidate, isChildable, isInvalidated, isListenerAvailable, isVisible, onChildAdded, onChildRemoved, onPageAttached, onPageDetached, onWrongValue, query, queryAll, redrawChildren, removeAttribute, removeAttribute, removeAttribute, removeChild, removeEventListener, removeForward, removeForward, removeRedrawCallback, removeScopeListener, removeShadowRoot, render, render, render, renderProperties, replace, response, response, response, service, service, sessionDidActivate, sessionWillPassivate, setAttribute, setAttribute, setAttribute, setAuService, setAutag, setClientAttribute, setDefinition, setDefinition, setId, setMold, setPage, setPageBefore, setParent, setStubonly, setStubonly, setSubBindingAnnotationCount, setTemplate, setVisible, setVisibleDirectly, setWidgetAttribute, setWidgetClass, setWidgetListener, setWidgetOverride, smartUpdate, smartUpdate, smartUpdate, smartUpdate, smartUpdate, smartUpdate, smartUpdate, smartUpdate, smartUpdate, smartUpdateWidgetListener, smartUpdateWidgetOverride, toString, updateByClient, updateSubBindingAnnotationCount, willPassivate, willPassivate, willSerialize, willSerialize

Methods inherited from class java.lang.Object

finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

Zkhead

public Zkhead()

Method Detail

redraw

public void redraw(java.io.Writer out)
            throws java.io.IOException

Description copied from class: AbstractComponent

Redraws this component and all its descendants.

Default: It uses JsContentRenderer to render all information in JavaScript codes. For devices that don't support JavaScript, it must override this method.

To generate all information, it first invokes AbstractComponent.renderProperties(org.zkoss.zk.ui.sys.ContentRenderer) to render component's properties, and then AbstractComponent.redrawChildren(java.io.Writer) to redraw children (and descendants) (by calling their AbstractComponent.redraw(java.io.Writer)).

If a derived class wants to render more properties, it can override AbstractComponent.renderProperties(org.zkoss.zk.ui.sys.ContentRenderer).

If a derived class renders only a subset of its children (such as paging/cropping), it could override AbstractComponent.redrawChildren(java.io.Writer).

If a deriving class wants to do something before AbstractComponent.renderProperties(org.zkoss.zk.ui.sys.ContentRenderer), it has to override AbstractComponent.redraw(java.io.Writer).

If a deriving class doesn't want to render in JavaScript codes, it has to override AbstractComponent.redraw(java.io.Writer) with the proper implementation of ContentRenderer.

Specified by:

redraw in interface ComponentCtrl

Overrides:

redraw in class AbstractComponent

Throws:

java.io.IOException

getExtraCtrl

public java.lang.Object getExtraCtrl()

Description copied from class: AbstractComponent

Returns the extra controls that tell ZK how to handle this component specially. It is used only by component developers.

Default: null.

Specified by:

getExtraCtrl in interface ComponentCtrl

Overrides:

getExtraCtrl in class AbstractComponent

Returns:

null if no special handling required. If the component requires some special controls, it could return an object that implements one or several interfaces in the org.zkoss.zk.ui.ext.render package. For example, Cropper.

See Also:

ComponentCtrl.getExtraCtrl()