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## javax.swing.text.html
Class HTMLDocument

    java.lang.Object
      javax.swing.text.AbstractDocument
          javax.swing.text.DefaultStyledDocument
              javax.swing.text.html.HTMLDocument

All Implemented Interfaces:
  Serializable, Document, StyledDocument

    public class HTMLDocument

extends DefaultStyledDocument

A document that models HTML. The purpose of this model is to support both browsing and editing. As a result, the structure described by an HTML document is not exactly replicated by default. The element structure that is modeled by default, is built by the class `HTMLDocument.HTMLReader`, which implements the `HTMLEditorKit.ParserCallback` protocol that the parser expects. To change the structure one can subclass `HTMLReader`, and reimplement the method `getReader(int)` to return the new reader implementation. The documentation for `HTMLReader` should be consulted for the details of the default structure created. The intent is that the document be non-lossy (although reproducing the HTML format may result in a different format).

The document models only HTML, and makes no attempt to store view attributes in it. The elements are identified by the `StyleContext.NameAttribute` attribute, which should always have a value of type `HTML.Tag` that identifies the kind of element. Some of the elements (such as comments) are synthesized. The `HTMLFactory` uses this attribute to determine what kind of view to build.

This document supports incremental loading. The `TokenThreshold` property controls how much of the parse is buffered before trying to update the element structure of the document. This property is set by the `EditorKit` so that subclasses can disable it.

The `Base` property determines the URL against which relative URLs are resolved. By default, this will be the `Document.StreamDescriptionProperty` if the value of the property is a URL. If a <BASE> tag is encountered, the base will become the URL specified by that tag. Because the base URL is a property, it can of course be set directly.

The default content storage mechanism for this document is a gap buffer (`GapContent`). Alternatives can be supplied by using the constructor that takes a `Content` implementation.

Warning: Serialized objects of this class will not be compatible with future Swing releases. The current serialization support is appropriate for short term storage or RMI between applications running the same version of Swing. As of 1.4, support for long term storage of all JavaBeansTM has been added to the `java.beans` package. Please see `XMLEncoder`.

Nested Class Summary
`class` | `HTMLDocument.BlockElement` An element that represents a structural block of HTML.
`class` | `HTMLDocument.HTMLReader` An HTML reader to load an HTML document with an HTML element structure.
`static class` | `HTMLDocument.Iterator` An iterator to iterate over a particular type of tag.
`class` | `HTMLDocument.RunElement` An element that represents a chunk of text that has a set of HTML character level attributes assigned to it.

Nested classes/interfaces inherited from class javax.swing.text.DefaultStyledDocument
`DefaultStyledDocument.AttributeUndoableEdit, DefaultStyledDocument.ElementBuffer, DefaultStyledDocument.ElementSpec, DefaultStyledDocument.SectionElement`

Nested classes/interfaces inherited from class javax.swing.text.AbstractDocument
`AbstractDocument.AbstractElement, AbstractDocument.AttributeContext, AbstractDocument.BranchElement, AbstractDocument.Content, AbstractDocument.DefaultDocumentEvent, AbstractDocument.ElementEdit, AbstractDocument.LeafElement`

Field Summary
`static String` | `AdditionalComments` Document property key value.

Fields inherited from class javax.swing.text.DefaultStyledDocument
`buffer, BUFFER_SIZE_DEFAULT`

Fields inherited from class javax.swing.text.AbstractDocument
`BAD_LOCATION, BidiElementName, ContentElementName, ElementNameAttribute, listenerList, ParagraphElementName, SectionElementName`

Fields inherited from interface javax.swing.text.Document
`StreamDescriptionProperty, TitleProperty`

Constructor Summary
`HTMLDocument()` Constructs an HTML document using the default buffer size and a default `StyleSheet`.
`HTMLDocument(AbstractDocument.Content c, StyleSheet styles)` Constructs an HTML document with the given content storage implementation and the given style/attribute storage mechanism.
`HTMLDocument(StyleSheet styles)` Constructs an HTML document with the default content storage implementation and the specified style/attribute storage mechanism.

Method Summary
`protected void` | `create(DefaultStyledDocument.ElementSpec[] data)` Replaces the contents of the document with the given element specifications.
`protected Element` | `createBranchElement(Element parent, AttributeSet a)` Creates a document branch element, that can contain other elements.
`protected AbstractDocument.AbstractElement` | `createDefaultRoot()` Creates the root element to be used to represent the default document structure.
`protected Element` | `createLeafElement(Element parent, AttributeSet a, int p0, int p1)` Creates a document leaf element that directly represents text (doesn't have any children).
`protected void` | `fireChangedUpdate(DocumentEvent e)` Notifies all listeners that have registered interest for notification on this event type.
`protected void` | `fireUndoableEditUpdate(UndoableEditEvent e)` Notifies all listeners that have registered interest for notification on this event type.
`URL` | `getBase()` Returns the location to resolve relative URLs against.
`Element` | `getElement(Element e, Object attribute, Object value)` Returns the child element of `e` that contains the attribute, `attribute` with value `value`, or `null` if one isn't found.
`Element` | `getElement(String id)` Returns the element that has the given id `Attribute`.
`HTMLDocument.Iterator` | `getIterator(HTML.Tag t)` Fetches an iterator for the specified HTML tag.
`HTMLEditorKit.Parser` | `getParser()` Returns the parser that is used when inserting HTML into the existing document.
`boolean` | `getPreservesUnknownTags()` Returns the behavior the parser observes when encountering unknown tags.
`HTMLEditorKit.ParserCallback` | `getReader(int pos)` Fetches the reader for the parser to use when loading the document with HTML.
`HTMLEditorKit.ParserCallback` | `getReader(int pos, int popDepth, int pushDepth, HTML.Tag insertTag)` Returns the reader for the parser to use to load the document with HTML.
`StyleSheet` | `getStyleSheet()` Fetches the `StyleSheet` with the document-specific display rules (CSS) that were specified in the HTML document itself.
`int` | `getTokenThreshold()` Gets the number of tokens to buffer before trying to update the documents element structure.
`protected void` | `insert(int offset, DefaultStyledDocument.ElementSpec[] data)` Inserts new elements in bulk.
`void` | `insertAfterEnd(Element elem, String htmlText)` Inserts the HTML specified as a string after the the end of the given element.
`void` | `insertAfterStart(Element elem, String htmlText)` Inserts the HTML specified as a string at the start of the element.
`void` | `insertBeforeEnd(Element elem, String htmlText)` Inserts the HTML specified as a string at the end of the element.
`void` | `insertBeforeStart(Element elem, String htmlText)` Inserts the HTML specified as a string before the start of the given element.
`protected void` | `insertUpdate(AbstractDocument.DefaultDocumentEvent chng, AttributeSet attr)` Updates document structure as a result of text insertion.
`void` | `processHTMLFrameHyperlinkEvent(HTMLFrameHyperlinkEvent e)` Processes `HyperlinkEvents` that are generated by documents in an HTML frame.
`void` | `setBase(URL u)` Sets the location to resolve relative URLs against.
`void` | `setInnerHTML(Element elem, String htmlText)` Replaces the children of the given element with the contents specified as an HTML string.
`void` | `setOuterHTML(Element elem, String htmlText)` Replaces the given element in the parent with the contents specified as an HTML string.
`void` | `setParagraphAttributes(int offset, int length, AttributeSet s, boolean replace)` Sets attributes for a paragraph.
`void` | `setParser(HTMLEditorKit.Parser parser)` Sets the parser that is used by the methods that insert html into the existing document, such as `setInnerHTML`, and `setOuterHTML`.
`void` | `setPreservesUnknownTags(boolean preservesTags)` Determines how unknown tags are handled by the parser.
`void` | `setTokenThreshold(int n)` Sets the number of tokens to buffer before trying to update the documents element structure.

Methods inherited from class javax.swing.text.DefaultStyledDocument
`addDocumentListener, addStyle, getBackground, getCharacterElement, getDefaultRootElement, getFont, getForeground, getLogicalStyle, getParagraphElement, getStyle, getStyleNames, removeDocumentListener, removeStyle, removeUpdate, setCharacterAttributes, setLogicalStyle, styleChanged`

Methods inherited from class javax.swing.text.AbstractDocument
`addUndoableEditListener, createPosition, dump, fireInsertUpdate, fireRemoveUpdate, getAsynchronousLoadPriority, getAttributeContext, getBidiRootElement, getContent, getCurrentWriter, getDocumentFilter, getDocumentListeners, getDocumentProperties, getEndPosition, getLength, getListeners, getProperty, getRootElements, getStartPosition, getText, getText, getUndoableEditListeners, insertString, postRemoveUpdate, putProperty, readLock, readUnlock, remove, removeUndoableEditListener, render, replace, setAsynchronousLoadPriority, setDocumentFilter, setDocumentProperties, writeLock, writeUnlock`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Methods inherited from interface javax.swing.text.Document
`addUndoableEditListener, createPosition, getEndPosition, getLength, getProperty, getRootElements, getStartPosition, getText, getText, insertString, putProperty, remove, removeUndoableEditListener, render`

Field Detail

### AdditionalComments

    public static final String AdditionalComments

  Document property key value. The value for the key will be a Vector of Strings that are comments not found in the body.

  See Also:
    Constant Field Values

Constructor Detail

### HTMLDocument

    public HTMLDocument()

  Constructs an HTML document using the default buffer size and a default `StyleSheet`. This is a convenience method for the constructor `HTMLDocument(Content, StyleSheet)`.

### HTMLDocument

    public HTMLDocument(StyleSheet styles)

  Constructs an HTML document with the default content storage implementation and the specified style/attribute storage mechanism. This is a convenience method for the constructor `HTMLDocument(Content, StyleSheet)`.

  Parameters:
    `styles` - the styles

### HTMLDocument

    public HTMLDocument(AbstractDocument.Content c,
                        StyleSheet styles)

  Constructs an HTML document with the given content storage implementation and the given style/attribute storage mechanism.

  Parameters:
    `c` - the container for the content
    `styles` - the styles

Method Detail

### getReader

    public HTMLEditorKit.ParserCallback getReader(int pos)

  Fetches the reader for the parser to use when loading the document with HTML. This is implemented to return an instance of `HTMLDocument.HTMLReader`. Subclasses can reimplement this method to change how the document gets structured if desired. (For example, to handle custom tags, or structurally represent character style elements.)

  Parameters:
    `pos` - the starting position
  Returns:
    the reader used by the parser to load the document

### getReader

    public HTMLEditorKit.ParserCallback getReader(int pos,
                                                  int popDepth,
                                                  int pushDepth,
                                                  HTML.Tag insertTag)

  Returns the reader for the parser to use to load the document with HTML. This is implemented to return an instance of `HTMLDocument.HTMLReader`. Subclasses can reimplement this method to change how the document gets structured if desired. (For example, to handle custom tags, or structurally represent character style elements.)

  This is a convenience method for `getReader(int, int, int, HTML.Tag, TRUE)`.

  Parameters:
    `popDepth` - the number of `ElementSpec.EndTagTypes` to generate before inserting
    `pushDepth` - the number of `ElementSpec.StartTagTypes` with a direction of `ElementSpec.JoinNextDirection` that should be generated before inserting, but after the end tags have been generated
    `insertTag` - the first tag to start inserting into document
  Returns:
    the reader used by the parser to load the document

### getBase

    public URL getBase()

  Returns the location to resolve relative URLs against. By default this will be the document's URL if the document was loaded from a URL. If a base tag is found and can be parsed, it will be used as the base location.

  Returns:
    the base location

### setBase

    public void setBase(URL u)

  Sets the location to resolve relative URLs against. By default this will be the document's URL if the document was loaded from a URL. If a base tag is found and can be parsed, it will be used as the base location.

  This also sets the base of the `StyleSheet` to be `u` as well as the base of the document.

  Parameters:
    `u` - the desired base URL

### insert

    protected void insert(int offset,
                          DefaultStyledDocument.ElementSpec[] data)
                   throws BadLocationException

  Inserts new elements in bulk. This is how elements get created in the document. The parsing determines what structure is needed and creates the specification as a set of tokens that describe the edit while leaving the document free of a write-lock. This method can then be called in bursts by the reader to acquire a write-lock for a shorter duration (i.e. while the document is actually being altered).

  Overrides:
    `insert` in class `DefaultStyledDocument`
  Parameters:
    `offset` - the starting offset
    `data` - the element data
  Throws:
    `BadLocationException` - if the given position does not represent a valid location in the associated document.

### insertUpdate

    protected void insertUpdate(AbstractDocument.DefaultDocumentEvent chng,
                                AttributeSet attr)

  Updates document structure as a result of text insertion. This will happen within a write lock. This implementation simply parses the inserted content for line breaks and builds up a set of instructions for the element buffer.

  Overrides:
    `insertUpdate` in class `DefaultStyledDocument`
  Parameters:
    `chng` - a description of the document change
    `attr` - the attributes

### create

    protected void create(DefaultStyledDocument.ElementSpec[] data)

  Replaces the contents of the document with the given element specifications. This is called before insert if the loading is done in bursts. This is the only method called if loading the document entirely in one burst.

  Overrides:
    `create` in class `DefaultStyledDocument`
  Parameters:
    `data` - the new contents of the document

### setParagraphAttributes

    public void setParagraphAttributes(int offset,
                                       int length,
                                       AttributeSet s,
                                       boolean replace)

  Sets attributes for a paragraph.

  This method is thread safe, although most Swing methods are not. Please see How to Use Threads for more information.

  Specified by:
    `setParagraphAttributes` in interface `StyledDocument`
  Overrides:
    `setParagraphAttributes` in class `DefaultStyledDocument`
  Parameters:
    `offset` - the offset into the paragraph (must be at least 0)
    `length` - the number of characters affected (must be at least 0)
    `s` - the attributes
    `replace` - whether to replace existing attributes, or merge them

### getStyleSheet

    public StyleSheet getStyleSheet()

  Fetches the `StyleSheet` with the document-specific display rules (CSS) that were specified in the HTML document itself.

  Returns:
    the `StyleSheet`

### getIterator

    public HTMLDocument.Iterator getIterator(HTML.Tag t)

  Fetches an iterator for the specified HTML tag. This can be used for things like iterating over the set of anchors contained, or iterating over the input elements.

  Parameters:
    `t` - the requested `HTML.Tag`
  Returns:
    the `Iterator` for the given HTML tag
  See Also:
    `HTML.Tag`

### createLeafElement

    protected Element createLeafElement(Element parent,
                                        AttributeSet a,
                                        int p0,
                                        int p1)

  Creates a document leaf element that directly represents text (doesn't have any children). This is implemented to return an element of type `HTMLDocument.RunElement`.

  Overrides:
    `createLeafElement` in class `AbstractDocument`
  Parameters:
    `parent` - the parent element
    `a` - the attributes for the element
    `p0` - the beginning of the range (must be at least 0)
    `p1` - the end of the range (must be at least p0)
  Returns:
    the new element

### createBranchElement

    protected Element createBranchElement(Element parent,
                                          AttributeSet a)

  Creates a document branch element, that can contain other elements. This is implemented to return an element of type `HTMLDocument.BlockElement`.

  Overrides:
    `createBranchElement` in class `AbstractDocument`
  Parameters:
    `parent` - the parent element
    `a` - the attributes
  Returns:
    the element

### createDefaultRoot

    protected AbstractDocument.AbstractElement createDefaultRoot()

  Creates the root element to be used to represent the default document structure.

  Overrides:
    `createDefaultRoot` in class `DefaultStyledDocument`
  Returns:
    the element base

### setTokenThreshold

    public void setTokenThreshold(int n)

  Sets the number of tokens to buffer before trying to update the documents element structure.

  Parameters:
    `n` - the number of tokens to buffer

### getTokenThreshold

    public int getTokenThreshold()

  Gets the number of tokens to buffer before trying to update the documents element structure. The default value is `Integer.MAX_VALUE`.

  Returns:
    the number of tokens to buffer

### setPreservesUnknownTags

    public void setPreservesUnknownTags(boolean preservesTags)

  Determines how unknown tags are handled by the parser. If set to true, unknown tags are put in the model, otherwise they are dropped.

  Parameters:
    `preservesTags` - true if unknown tags should be saved in the model, otherwise tags are dropped
  See Also:
    `HTML.Tag`

### getPreservesUnknownTags

    public boolean getPreservesUnknownTags()

  Returns the behavior the parser observes when encountering unknown tags.

  Returns:
    true if unknown tags are to be preserved when parsing
  See Also:
    `HTML.Tag`

### processHTMLFrameHyperlinkEvent

    public void processHTMLFrameHyperlinkEvent(HTMLFrameHyperlinkEvent e)

  Processes `HyperlinkEvents` that are generated by documents in an HTML frame. The `HyperlinkEvent` type, as the parameter suggests, is `HTMLFrameHyperlinkEvent`. In addition to the typical information contained in a `HyperlinkEvent`, this event contains the element that corresponds to the frame in which the click happened (the source element) and the target name. The target name has 4 possible values:
  - _self
  - _parent
  - _top
  - a named frame
  If target is _self, the action is to change the value of the `HTML.Attribute.SRC` attribute and fires a `ChangedUpdate` event.

  If the target is _parent, then it deletes the parent element, which is a <FRAMESET> element, and inserts a new <FRAME> element, and sets its `HTML.Attribute.SRC` attribute to have a value equal to the destination URL and fire a `RemovedUpdate` and `InsertUpdate`.

  If the target is _top, this method does nothing. In the implementation of the view for a frame, namely the `FrameView`, the processing of _top is handled. Given that _top implies replacing the entire document, it made sense to handle this outside of the document that it will replace.

  If the target is a named frame, then the element hierarchy is searched for an element with a name equal to the target, its `HTML.Attribute.SRC` attribute is updated and a `ChangedUpdate` event is fired.

  Parameters:
    `e` - the event

### setParser

    public void setParser(HTMLEditorKit.Parser parser)

  Sets the parser that is used by the methods that insert html into the existing document, such as `setInnerHTML`, and `setOuterHTML`.

  `HTMLEditorKit.createDefaultDocument` will set the parser for you. If you create an `HTMLDocument` by hand, be sure and set the parser accordingly.

  Parameters:
    `parser` - the parser to be used for text insertion
  Since:
    1.3

### getParser

    public HTMLEditorKit.Parser getParser()

  Returns the parser that is used when inserting HTML into the existing document.

  Returns:
    the parser used for text insertion
  Since:
    1.3

### setInnerHTML

    public void setInnerHTML(Element elem,
                             String htmlText)
                      throws BadLocationException,
                             IOException

  Replaces the children of the given element with the contents specified as an HTML string.

  This will be seen as at least two events, n inserts followed by a remove.

  For this to work correcty, the document must have an `HTMLEditorKit.Parser` set. This will be the case if the document was created from an HTMLEditorKit via the `createDefaultDocument` method.

  Parameters:
    `elem` - the branch element whose children will be replaced
    `htmlText` - the string to be parsed and assigned to `elem`
  Throws:
    `IllegalArgumentException` - if `elem` is a leaf
    `IllegalStateException` - if an `HTMLEditorKit.Parser` has not been defined
    `BadLocationException`
    `IOException`
  Since:
    1.3

### setOuterHTML

    public void setOuterHTML(Element elem,
                             String htmlText)
                      throws BadLocationException,
                             IOException

  Replaces the given element in the parent with the contents specified as an HTML string.

  This will be seen as at least two events, n inserts followed by a remove.

  When replacing a leaf this will attempt to make sure there is a newline present if one is needed. This may result in an additional element being inserted. Consider, if you were to replace a character element that contained a newline with <img> this would create two elements, one for the image, ane one for the newline.

  If you try to replace the element at length you will most likely end up with two elements, eg setOuterHTML(getCharacterElement (getLength()), "blah") will result in two leaf elements at the end, one representing 'blah', and the other representing the end element.

  For this to work correcty, the document must have an HTMLEditorKit.Parser set. This will be the case if the document was created from an HTMLEditorKit via the `createDefaultDocument` method.

  Parameters:
    `elem` - the branch element whose children will be replaced
    `htmlText` - the string to be parsed and assigned to `elem`
  Throws:
    `IllegalStateException` - if an HTMLEditorKit.Parser has not been set
    `BadLocationException`
    `IOException`
  Since:
    1.3

### insertAfterStart

    public void insertAfterStart(Element elem,
                                 String htmlText)
                          throws BadLocationException,
                                 IOException

  Inserts the HTML specified as a string at the start of the element.

  For this to work correcty, the document must have an `HTMLEditorKit.Parser` set. This will be the case if the document was created from an HTMLEditorKit via the `createDefaultDocument` method.

  Parameters:
    `elem` - the branch element to be the root for the new text
    `htmlText` - the string to be parsed and assigned to `elem`
  Throws:
    `IllegalStateException` - if an HTMLEditorKit.Parser has not been set on the document
    `BadLocationException`
    `IOException`
  Since:
    1.3

### insertBeforeEnd

    public void insertBeforeEnd(Element elem,
                                String htmlText)
                         throws BadLocationException,
                                IOException

  Inserts the HTML specified as a string at the end of the element.

  If `elem`'s children are leaves, and the character at a `elem.getEndOffset() - 1` is a newline, this will insert before the newline so that there isn't text after the newline.

  For this to work correcty, the document must have an `HTMLEditorKit.Parser` set. This will be the case if the document was created from an HTMLEditorKit via the `createDefaultDocument` method.

  Parameters:
    `elem` - the element to be the root for the new text
    `htmlText` - the string to be parsed and assigned to `elem`
  Throws:
    `IllegalStateException` - if an HTMLEditorKit.Parser has not been set on the document
    `BadLocationException`
    `IOException`
  Since:
    1.3

### insertBeforeStart

    public void insertBeforeStart(Element elem,
                                  String htmlText)
                           throws BadLocationException,
                                  IOException

  Inserts the HTML specified as a string before the start of the given element.

  For this to work correcty, the document must have an `HTMLEditorKit.Parser` set. This will be the case if the document was created from an HTMLEditorKit via the `createDefaultDocument` method.

  Parameters:
    `elem` - the element to be the root for the new text
    `htmlText` - the string to be parsed and assigned to `elem`
  Throws:
    `IllegalStateException` - if an HTMLEditorKit.Parser has not been set on the document
    `BadLocationException`
    `IOException`
  Since:
    1.3

### insertAfterEnd

    public void insertAfterEnd(Element elem,
                               String htmlText)
                        throws BadLocationException,
                               IOException

  Inserts the HTML specified as a string after the the end of the given element.

  For this to work correcty, the document must have an `HTMLEditorKit.Parser` set. This will be the case if the document was created from an HTMLEditorKit via the `createDefaultDocument` method.

  Parameters:
    `elem` - the element to be the root for the new text
    `htmlText` - the string to be parsed and assigned to `elem`
  Throws:
    `IllegalStateException` - if an HTMLEditorKit.Parser has not been set on the document
    `BadLocationException`
    `IOException`
  Since:
    1.3

### getElement

    public Element getElement(String id)

  Returns the element that has the given id `Attribute`. If the element can't be found, `null` is returned. Note that this method works on an `Attribute`, not a character tag. In the following HTML snippet: `<a id="HelloThere">` the attribute is 'id' and the character tag is 'a'. This is a convenience method for `getElement(RootElement, HTML.Attribute.id, id)`. This is not thread-safe.

  Parameters:
    `id` - the string representing the desired `Attribute`
  Returns:
    the element with the specified `Attribute` or `null` if it can't be found, or `null` if `id` is `null`
  Since:
    1.3
  See Also:
    `HTML.Attribute`

### getElement

    public Element getElement(Element e,
                              Object attribute,
                              Object value)

  Returns the child element of `e` that contains the attribute, `attribute` with value `value`, or `null` if one isn't found. This is not thread-safe.

  Parameters:
    `e` - the root element where the search begins
    `attribute` - the desired `Attribute`
    `value` - the values for the specified `Attribute`
  Returns:
    the element with the specified `Attribute` and the specified `value`, or `null` if it can't be found
  Since:
    1.3
  See Also:
    `HTML.Attribute`

### fireChangedUpdate

    protected void fireChangedUpdate(DocumentEvent e)

  Notifies all listeners that have registered interest for notification on this event type. The event instance is lazily created using the parameters passed into the fire method.

  Overrides:
    `fireChangedUpdate` in class `AbstractDocument`
  Parameters:
    `e` - the event
  See Also:
    `EventListenerList`

### fireUndoableEditUpdate

    protected void fireUndoableEditUpdate(UndoableEditEvent e)

  Notifies all listeners that have registered interest for notification on this event type. The event instance is lazily created using the parameters passed into the fire method.

  Overrides:
    `fireUndoableEditUpdate` in class `AbstractDocument`
  Parameters:
    `e` - the event
  See Also:
    `EventListenerList`

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