com.google.gwt.user.client.ui

Class PotentialElement

java.lang.Object

com.google.gwt.core.client.JavaScriptObject

com.google.gwt.dom.client.Node

com.google.gwt.dom.client.Element

com.google.gwt.user.client.ui.PotentialElement

public class PotentialElement
extends Element

EXPERIMENTAL and subject to change. Do not use this in production code.

A simple Element implementation (not an actual dom object) that can serve as stand in to be used by IsRenderable widgets before they are fully built. For example, it can accumulate simple set*() values to be used when the widget is actually ready to render. Thus, most IsRenderable widget code can be written without taking into account whether or not the widget has yet been rendered.

DOM#appendChild is aware of PotentialElement, and calls its resolve() method. This triggers a call to UIObject.resolvePotentialElement(), which widgets can customize to get a real Element in place at the last moment. TODO(rdcastro): Cover all unsupported methods with helpful error messages.

Field Summary

Fields inherited from class com.google.gwt.dom.client.Element

DRAGGABLE_AUTO, DRAGGABLE_FALSE, DRAGGABLE_TRUE

Fields inherited from class com.google.gwt.dom.client.Node

DOCUMENT_NODE, ELEMENT_NODE, TEXT_NODE

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	PotentialElement()

Method Summary

Methods

Modifier and Type	Method and Description
static PotentialElement	as(Element e)
static PotentialElement	build(UIObject o) Builds a new PotentialElement with the tag name set to "div".
static PotentialElement	build(UIObject o, String tagName) Builds a new PotentialElement.
static HtmlElementBuilder	createBuilderFor(Element potentialElement) Creates an HtmlElementBuilder instance inheriting all attributes set for the given PotentialElement.
static boolean	isPotential(JavaScriptObject o) Tests whether a given JavaScriptObject represents a PotentialElement.
static Element	resolve(Element maybePotential) If given a PotentialElement, returns the real Element to be built from it.

Methods inherited from class com.google.gwt.dom.client.Element

addClassName, as, as, blur, dispatchEvent, focus, getAbsoluteBottom, getAbsoluteLeft, getAbsoluteRight, getAbsoluteTop, getAttribute, getClassName, getClientHeight, getClientWidth, getDir, getDraggable, getElementsByTagName, getFirstChildElement, getId, getInnerHTML, getInnerText, getLang, getNextSiblingElement, getOffsetHeight, getOffsetLeft, getOffsetParent, getOffsetTop, getOffsetWidth, getPreviousSiblingElement, getPropertyBoolean, getPropertyDouble, getPropertyInt, getPropertyJSO, getPropertyObject, getPropertyString, getScrollHeight, getScrollLeft, getScrollTop, getScrollWidth, getString, getStyle, getTabIndex, getTagName, getTitle, hasAttribute, hasClassName, hasTagName, is, is, removeAttribute, removeClassName, replaceClassName, scrollIntoView, setAttribute, setClassName, setDir, setDraggable, setId, setInnerHTML, setInnerSafeHtml, setInnerText, setLang, setPropertyBoolean, setPropertyDouble, setPropertyInt, setPropertyJSO, setPropertyObject, setPropertyString, setScrollLeft, setScrollTop, setTabIndex, setTitle, toggleClassName

Methods inherited from class com.google.gwt.dom.client.Node

appendChild, cloneNode, getChild, getChildCount, getChildNodes, getFirstChild, getLastChild, getNextSibling, getNodeName, getNodeType, getNodeValue, getOwnerDocument, getParentElement, getParentNode, getPreviousSibling, hasChildNodes, hasParentElement, insertAfter, insertBefore, insertFirst, isOrHasChild, removeAllChildren, removeChild, removeFromParent, replaceChild, setNodeValue

Methods inherited from class com.google.gwt.core.client.JavaScriptObject

cast, createArray, createArray, createFunction, createObject, equals, hashCode, toSource, toString

Methods inherited from class java.lang.Object

finalize, getClass

Constructor Detail

PotentialElement

protected PotentialElement()

Method Detail

as

public static PotentialElement as(Element e)

build

public static PotentialElement build(UIObject o)

Builds a new PotentialElement with the tag name set to "div".

See Also:

build(UIObject,String)

build

public static PotentialElement build(UIObject o,
                     String tagName)

Builds a new PotentialElement. This element keeps track of the UIObject so that it can call UIObject.resolvePotentialElement() to get a real element when that is needed.

createBuilderFor

public static HtmlElementBuilder createBuilderFor(Element potentialElement)

Creates an HtmlElementBuilder instance inheriting all attributes set for the given PotentialElement.

Parameters:

potentialElement - assumed to be a PotentialElement, used as basis for the builder

Returns:

a propertly configured HtmlElementBuilder instance

isPotential

public static boolean isPotential(JavaScriptObject o)

Tests whether a given JavaScriptObject represents a PotentialElement.

Parameters:

o - the JavaScriptObject to be tested

Returns:

true if the given object is a PotentialElement instance

resolve

public static Element resolve(Element maybePotential)

If given a PotentialElement, returns the real Element to be built from it. Otherwise returns the given Element itself.

Note that a PotentialElement can only be resolved once. Making repeated calls to this method with the same PotentialElement is an error.