org.vectomatic.dom.svg.impl

Class DOMHelperImpl

java.lang.Object

org.vectomatic.dom.svg.impl.DOMHelperImpl

public class DOMHelperImpl
extends Object

Implementation class for low-level GWT integration (mostly event dispatching) Xpath support for IE, based on Cameron McCormack's library (http://mcc.id.au/xpathjs) SVGPathSeg support for Chromium 48+, based on Philip Rogers's polyfill (https://github.com/progers/pathseg/blob/master/pathseg.js)

Author:

laaglu

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static interface	DOMHelperImpl.Resource

Field Summary

Fields

Modifier and Type	Field and Description
protected OMSVGElement	captureElt
protected static boolean	eventsInitialized

Constructor Summary

Constructors

Constructor and Description
DOMHelperImpl()

Method Summary

Modifier and Type	Method and Description
void	bindEventListener(com.google.gwt.dom.client.Element elem, String eventName) Makes a node sink the events emitted by the specified element
void	dispatch(com.google.gwt.dom.client.NativeEvent event, OMNode node, com.google.gwt.dom.client.Element elem) Central dispatching function for events emitted by DOM objects
void	dispatchCapturedEvent(com.google.gwt.dom.client.NativeEvent event, com.google.gwt.dom.client.Element elem) Dispatching function for events which result from a call to setCaptureElement(OMSVGElement, LoseCaptureHandler)
boolean	evaluateBooleanXPath_(com.google.gwt.dom.client.Element svgElement, String expr, XPathPrefixResolver resolver)
com.google.gwt.core.client.JavaScriptObject	evaluateNodeListXPath_(com.google.gwt.dom.client.Element svgElement, String expr, XPathPrefixResolver resolver)
com.google.gwt.dom.client.Node	evaluateNodeXPath_(com.google.gwt.dom.client.Element svgElement, String expr, XPathPrefixResolver resolver)
float	evaluateNumberXPath_(com.google.gwt.dom.client.Element svgElement, String expr, XPathPrefixResolver resolver)
String	evaluateStringXPath_(com.google.gwt.dom.client.Element svgElement, String expr, XPathPrefixResolver resolver)
OMSVGElement	getCaptureElement() Returns the element which currently captures all the events after a call to setCaptureElement(OMSVGElement, LoseCaptureHandler) or null if element is set to capture events
static com.google.gwt.dom.client.Document	getIFrameDocument()
static boolean	hasGetTransformToElement()
static boolean	hasNativePathSeg()
static boolean	hasNativeXPath()
protected void	init()
protected void	initEventSystem() Initializes the event system.
protected void	initXPath()
protected boolean	isChildOf(com.google.gwt.dom.client.Node root, com.google.gwt.dom.client.Node node) Tests if a node is part of a DOM subtree.
void	releaseCaptureElement() Stops the forwarding of all events to the capturing element specified by setCaptureElement(OMSVGElement, LoseCaptureHandler)
com.google.gwt.event.shared.HandlerRegistration	setCaptureElement(OMSVGElement captureElt, com.google.gwt.event.dom.client.LoseCaptureHandler loseCaptureHandler) Makes the specified element capture all the events, until a call to releaseCaptureElement() terminates the capture
protected void	sinkEvents(com.google.gwt.dom.client.Element elem, String eventName) Activate the event listener for the specified event on an element
void	unbindEventListener(com.google.gwt.dom.client.Element elem, String eventName) Makes a node stop sinking the events emitted by the specified element
protected void	unsinkEvents(com.google.gwt.dom.client.Element elem, String eventName) Deactivate the event listener for the specified event on an element

Methods inherited from class java.lang.Object

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

Field Detail

eventsInitialized

protected static boolean eventsInitialized

captureElt

protected OMSVGElement captureElt

Constructor Detail

DOMHelperImpl

public DOMHelperImpl()

Method Detail

initEventSystem

protected void initEventSystem()

Initializes the event system. Positions event handlers on the window so that they can capture events early if necessary.

init

protected void init()

bindEventListener

public void bindEventListener(com.google.gwt.dom.client.Element elem,
                              String eventName)

Makes a node sink the events emitted by the specified element

Parameters:

elem - The element emitting the events

eventName - The event name

unbindEventListener

public void unbindEventListener(com.google.gwt.dom.client.Element elem,
                                String eventName)

Makes a node stop sinking the events emitted by the specified element

Parameters:

elem - The element emitting the events

eventName - The event name

getCaptureElement

public OMSVGElement getCaptureElement()

Returns the element which currently captures all the events after a call to setCaptureElement(OMSVGElement, LoseCaptureHandler) or null if element is set to capture events

Returns:

The event capturing element

setCaptureElement

public com.google.gwt.event.shared.HandlerRegistration setCaptureElement(OMSVGElement captureElt,
                                                                         com.google.gwt.event.dom.client.LoseCaptureHandler loseCaptureHandler)

Makes the specified element capture all the events, until a call to releaseCaptureElement() terminates the capture

Parameters:

captureElt - The capturing element

loseCaptureHandler - A handler which will be invoked if the element loses capture

Returns:

HandlerRegistration used to remove this handler

releaseCaptureElement

public void releaseCaptureElement()

Stops the forwarding of all events to the capturing element specified by setCaptureElement(OMSVGElement, LoseCaptureHandler)

sinkEvents

protected void sinkEvents(com.google.gwt.dom.client.Element elem,
                          String eventName)

Activate the event listener for the specified event on an element

Parameters:

elem - The object which emits events

eventName - The event name

unsinkEvents

protected void unsinkEvents(com.google.gwt.dom.client.Element elem,
                            String eventName)

Deactivate the event listener for the specified event on an element

Parameters:

elem - The object which emits events

eventName - The event name

dispatch

public void dispatch(com.google.gwt.dom.client.NativeEvent event,
                     OMNode node,
                     com.google.gwt.dom.client.Element elem)

Central dispatching function for events emitted by DOM objects

Parameters:

event - The DOM event

node - The object processing the event

elem - The object emitting the event

dispatchCapturedEvent

public void dispatchCapturedEvent(com.google.gwt.dom.client.NativeEvent event,
                                  com.google.gwt.dom.client.Element elem)

Dispatching function for events which result from a call to setCaptureElement(OMSVGElement, LoseCaptureHandler)

Parameters:

event - The DOM event

elem - The object emitting the event

isChildOf

protected boolean isChildOf(com.google.gwt.dom.client.Node root,
                            com.google.gwt.dom.client.Node node)

Tests if a node is part of a DOM subtree.

Parameters:

root - The subtree root

node - The node to be tested

Returns:

True if the node is part of the subtree, false otherwise

evaluateNodeListXPath_

public com.google.gwt.core.client.JavaScriptObject evaluateNodeListXPath_(com.google.gwt.dom.client.Element svgElement,
                                                                          String expr,
                                                                          XPathPrefixResolver resolver)

evaluateNodeXPath_

public com.google.gwt.dom.client.Node evaluateNodeXPath_(com.google.gwt.dom.client.Element svgElement,
                                                         String expr,
                                                         XPathPrefixResolver resolver)

evaluateStringXPath_

public String evaluateStringXPath_(com.google.gwt.dom.client.Element svgElement,
                                   String expr,
                                   XPathPrefixResolver resolver)

evaluateNumberXPath_

public float evaluateNumberXPath_(com.google.gwt.dom.client.Element svgElement,
                                  String expr,
                                  XPathPrefixResolver resolver)

evaluateBooleanXPath_

public boolean evaluateBooleanXPath_(com.google.gwt.dom.client.Element svgElement,
                                     String expr,
                                     XPathPrefixResolver resolver)

hasNativeXPath

public static boolean hasNativeXPath()

hasNativePathSeg

public static boolean hasNativePathSeg()

hasGetTransformToElement

public static boolean hasGetTransformToElement()

initXPath

protected void initXPath()

getIFrameDocument

public static com.google.gwt.dom.client.Document getIFrameDocument()