com.vaadin.flow.dom

Interface ElementStateProvider

All Superinterfaces:

Serializable

All Known Implementing Classes:

AbstractNodeStateProvider, AbstractTextElementStateProvider, BasicElementStateProvider, BasicTextElementStateProvider, ShadowRootStateProvider

public interface ElementStateProvider
extends Serializable

Handles storing and retrieval of the state information for an element using a state node.

Since:

1.0

Author:

Vaadin Ltd

Method Summary

Modifier and Type	Method and Description
DomListenerRegistration	addEventListener(StateNode node, String eventType, DomEventListener listener) Adds a DOM event listener.
Registration	addPropertyChangeListener(StateNode node, String name, PropertyChangeListener listener) Adds a property change listener.
void	appendVirtualChild(StateNode node, Element child, String type, String payload) Append the given element as a virtual child.
void	attachExistingElement(StateNode node, String tagName, Element previousSibling, ChildElementConsumer callback) Attaches a child element with the given tagName which is the next sibling for the previousSibling.
StateNode	attachShadow(StateNode node) Attaches the shadow root for the node.
String	getAttribute(StateNode node, String attribute) Gets the value of the given attribute.
Stream<String>	getAttributeNames(StateNode node) Gets the defined attribute names.
Element	getChild(StateNode node, int index) Returns the child element at the given position.
int	getChildCount(StateNode node) Gets the number of child elements.
ClassList	getClassList(StateNode node) Gets a list representation of all CSS class names set for an element.
default Optional<Component>	getComponent(StateNode node) Gets the component this element is mapped to.
Node	getParent(StateNode node) Gets the parent element.
Serializable	getProperty(StateNode node, String name) Gets the value of the given property.
Stream<String>	getPropertyNames(StateNode node) Gets the defined property names.
StateNode	getShadowRoot(StateNode node) Gets shadow root for the node if it has been attached.
Style	getStyle(StateNode node) Returns a style instance for managing element inline styles.
String	getTag(StateNode node) Gets the tag name for the given node.
String	getTextContent(StateNode node) Gets the text content.
boolean	hasAttribute(StateNode node, String attribute) Checks if the given attribute has been set.
boolean	hasProperty(StateNode node, String name) Checks if the given property has been set.
void	insertChild(StateNode node, int index, Element child) Inserts the given child at the given position.
boolean	isTextNode(StateNode node) Checks if the state node represents a text node.
boolean	isVisible(StateNode node) Gets the node visibility.
void	removeAllChildren(StateNode node) Removes all child elements.
void	removeAttribute(StateNode node, String attribute) Removes the given attribute if it has been set.
void	removeChild(StateNode node, Element child) Removes the given child.
void	removeChild(StateNode node, int index) Removes the child at the given position.
void	removeProperty(StateNode node, String name) Removes the given property if it has been set.
void	setAttribute(StateNode node, String attribute, AbstractStreamResource resource) Sets the given attribute to the given StreamResource value.
void	setAttribute(StateNode node, String attribute, String value) Sets the given attribute to the given value.
default void	setComponent(StateNode node, Component component) Defines a mapping between the element and the given component.
void	setProperty(StateNode node, String name, Serializable value, boolean emitChange) Sets the given property to the given value.
void	setTextContent(StateNode node, String textContent) Sets the text content.
void	setVisible(StateNode node, boolean visible) Sets the node visibility.
boolean	supports(StateNode node) Checks if the element state provider supports the given state node.
void	visit(StateNode node, NodeVisitor visitor) Visit the node applying visitor to it and its descendants based on the return value from the visitor.

Method Detail

supports

boolean supports(StateNode node)

Checks if the element state provider supports the given state node.

Parameters:

node - the state node to check

Returns:

true if the element state provider is compatible with the given state node, false otherwise

getTag

String getTag(StateNode node)

Gets the tag name for the given node.

Parameters:

node - the node containing the data

Returns:

the tag name

setAttribute

void setAttribute(StateNode node,
                  String attribute,
                  String value)

Sets the given attribute to the given value.

Parameters:

node - the node containing the data

attribute - the attribute name, not null

value - the attribute value

setAttribute

void setAttribute(StateNode node,
                  String attribute,
                  AbstractStreamResource resource)

Sets the given attribute to the given StreamResource value.

Parameters:

node - the node containing the data

attribute - the attribute name, not null

resource - the attribute value, not null

getAttribute

String getAttribute(StateNode node,
                    String attribute)

Gets the value of the given attribute.

Parameters:

node - the node containing the data

attribute - the attribute name, not null

Returns:

the attribute value or null if the attribute has not been set

hasAttribute

boolean hasAttribute(StateNode node,
                     String attribute)

Checks if the given attribute has been set.

Parameters:

node - the node containing the data

attribute - the attribute name, not null

Returns:

true if the attribute has been set, false otherwise

removeAttribute

void removeAttribute(StateNode node,
                     String attribute)

Removes the given attribute if it has been set.

Parameters:

node - the node containing the data

attribute - the attribute name, not null

getAttributeNames

Stream<String> getAttributeNames(StateNode node)

Gets the defined attribute names.

Parameters:

node - the node containing the data

Returns:

the defined attribute names

getParent

Node getParent(StateNode node)

Gets the parent element.

Parameters:

node - the node containing the data

Returns:

the parent element or null if the element has no parent

getChildCount

int getChildCount(StateNode node)

Gets the number of child elements.

Parameters:

node - the node containing the data

Returns:

the number of child elements

getChild

Element getChild(StateNode node,
                 int index)

Returns the child element at the given position.

Parameters:

node - the node containing the data

index - the index of the child element to return

Returns:

the child element

insertChild

void insertChild(StateNode node,
                 int index,
                 Element child)

Inserts the given child at the given position.

Parameters:

node - the node containing the data

index - the position at which to insert the new child

child - the child element to insert

removeChild

void removeChild(StateNode node,
                 int index)

Removes the child at the given position.

Parameters:

node - the node containing the data

index - the position of the child element to remove

removeChild

void removeChild(StateNode node,
                 Element child)

Removes the given child.

Parameters:

node - the node containing the data

child - the child element to remove

removeAllChildren

void removeAllChildren(StateNode node)

Removes all child elements.

Parameters:

node - the node containing the data

addEventListener

DomListenerRegistration addEventListener(StateNode node,
                                         String eventType,
                                         DomEventListener listener)

Adds a DOM event listener.

Parameters:

node - the node containing the data

eventType - the event type

listener - the listener

Returns:

a handle for configuring or removing the listener

getProperty

Serializable getProperty(StateNode node,
                         String name)

Gets the value of the given property.

Parameters:

node - the node containing the data

name - the property name, not null

Returns:

the property value, or null if the property has not been set

setProperty

void setProperty(StateNode node,
                 String name,
                 Serializable value,
                 boolean emitChange)

Sets the given property to the given value.

Parameters:

node - the node containing the data

name - the property name, not null

value - the property value

emitChange - true to create a change event for the client side

removeProperty

void removeProperty(StateNode node,
                    String name)

Removes the given property if it has been set.

Parameters:

node - the node containing the data

name - the property name, not null

hasProperty

boolean hasProperty(StateNode node,
                    String name)

Checks if the given property has been set.

Parameters:

node - the node containing the data

name - the property name, not null

Returns:

true if the property has been set, false otherwise

getPropertyNames

Stream<String> getPropertyNames(StateNode node)

Gets the defined property names.

Parameters:

node - the node containing the data

Returns:

the defined property names

isTextNode

boolean isTextNode(StateNode node)

Checks if the state node represents a text node.

Parameters:

node - the node to check

Returns:

true if the state node represents a text node; otherwise false

getTextContent

String getTextContent(StateNode node)

Gets the text content. This is only valid if isTextNode(StateNode) returns true.

Parameters:

node - the node containing the data

Returns:

the text content

setTextContent

void setTextContent(StateNode node,
                    String textContent)

Sets the text content. This is only valid if isTextNode(StateNode) returns true.

Parameters:

node - the node containing the data

textContent - the text content, not null

getClassList

ClassList getClassList(StateNode node)

Gets a list representation of all CSS class names set for an element.

Parameters:

node - the node containing the data

Returns:

the class list, never null

getStyle

Style getStyle(StateNode node)

Returns a style instance for managing element inline styles.

Parameters:

node - the node containing the data

Returns:

the element styles

setComponent

default void setComponent(StateNode node,
                          Component component)

Defines a mapping between the element and the given component.

Parameters:

node - the node containing the data

component - the component to map the element to

getComponent

default Optional<Component> getComponent(StateNode node)

Gets the component this element is mapped to.

Parameters:

node - the node containing the data

Returns:

an optional component, or an empty optional if no component has been mapped to this node

addPropertyChangeListener

Registration addPropertyChangeListener(StateNode node,
                                       String name,
                                       PropertyChangeListener listener)

Adds a property change listener.

Parameters:

node - the node containing the property

name - the property name to add the listener for

listener - listener to get notifications about property value changes

Returns:

an event registration handle for removing the listener

getShadowRoot

StateNode getShadowRoot(StateNode node)

Gets shadow root for the node if it has been attached.

Parameters:

node - the node having a shadow root, not null

Returns:

the shadow root of the node, may be null

attachShadow

StateNode attachShadow(StateNode node)

Attaches the shadow root for the node.

Parameters:

node - the node to attach the shadow root

Returns:

the shadow root of the node

attachExistingElement

void attachExistingElement(StateNode node,
                           String tagName,
                           Element previousSibling,
                           ChildElementConsumer callback)

Attaches a child element with the given tagName which is the next sibling for the previousSibling.

The previousSibling parameter value can be null which means that the very first child with the given tagName will be used to attach (if any).

Parameters:

node - the parent node

tagName - the tag name of the element to attach, not null

previousSibling - previous sibling, may be null

callback - the callback which will be invoked with a server side element instance or an error will be reported, not null

appendVirtualChild

void appendVirtualChild(StateNode node,
                        Element child,
                        String type,
                        String payload)

Append the given element as a virtual child.

Parameters:

node - the node containing the data

child - the child element to add

type - the type of additional payload data

payload - the additional payload data

visit

void visit(StateNode node,
           NodeVisitor visitor)

Visit the node applying visitor to it and its descendants based on the return value from the visitor.

Parameters:

node - the node to visit

visitor - the visitor to apply to the node

setVisible

void setVisible(StateNode node,
                boolean visible)

Sets the node visibility.

Parameters:

node - the node containing the data

visible - the node visibility value

isVisible

boolean isVisible(StateNode node)

Gets the node visibility.

Parameters:

node - the node containing the data

Returns:

the node visibility