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- java.lang.Object
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- javax.swing.text.AbstractDocument
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- javax.swing.text.PlainDocument
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- All Implemented Interfaces:
- Serializable, Document
public class PlainDocument extends AbstractDocument
A plain document that maintains no character attributes. The default element structure for this document is a map of the lines in the text. The Element returned by getDefaultRootElement is a map of the lines, and each child element represents a line. This model does not maintain any character level attributes, but each line can be tagged with an arbitrary set of attributes. Line to offset, and offset to line translations can be quickly performed using the default root element. The structure information of the DocumentEvent's fired by edits will indicate the line structure changes.The default content storage management is performed by a gapped buffer implementation (GapContent). It supports editing reasonably large documents with good efficiency when the edits are contiguous or clustered, as is typical.
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.beanspackage. Please seeXMLEncoder.- See Also:
Document,AbstractDocument
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Nested Class Summary
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Nested classes/interfaces inherited from class javax.swing.text.AbstractDocument
AbstractDocument.AbstractElement, AbstractDocument.AttributeContext, AbstractDocument.BranchElement, AbstractDocument.Content, AbstractDocument.DefaultDocumentEvent, AbstractDocument.ElementEdit, AbstractDocument.LeafElement
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Field Summary
Fields Modifier and Type Field and Description static StringlineLimitAttributeName of the attribute that specifies the maximum length of a line, if there is a maximum length.static StringtabSizeAttributeName of the attribute that specifies the tab size for tabs contained in the content.-
Fields inherited from class javax.swing.text.AbstractDocument
BAD_LOCATION, BidiElementName, ContentElementName, ElementNameAttribute, listenerList, ParagraphElementName, SectionElementName
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Fields inherited from interface javax.swing.text.Document
StreamDescriptionProperty, TitleProperty
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Constructor Summary
Constructors Constructor and Description PlainDocument()Constructs a plain text document.PlainDocument(AbstractDocument.Content c)Constructs a plain text document.
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Method Summary
Methods Modifier and Type Method and Description protected AbstractDocument.AbstractElementcreateDefaultRoot()Creates the root element to be used to represent the default document structure.ElementgetDefaultRootElement()Gets the default root element for the document model.ElementgetParagraphElement(int pos)Get the paragraph element containing the given position.voidinsertString(int offs, String str, AttributeSet a)Inserts some content into the document.protected voidinsertUpdate(AbstractDocument.DefaultDocumentEvent chng, AttributeSet attr)Updates document structure as a result of text insertion.protected voidremoveUpdate(AbstractDocument.DefaultDocumentEvent chng)Updates any document structure as a result of text removal.-
Methods inherited from class javax.swing.text.AbstractDocument
addDocumentListener, addUndoableEditListener, createBranchElement, createLeafElement, createPosition, dump, fireChangedUpdate, fireInsertUpdate, fireRemoveUpdate, fireUndoableEditUpdate, getAsynchronousLoadPriority, getAttributeContext, getBidiRootElement, getContent, getCurrentWriter, getDocumentFilter, getDocumentListeners, getDocumentProperties, getEndPosition, getLength, getListeners, getProperty, getRootElements, getStartPosition, getText, getText, getUndoableEditListeners, postRemoveUpdate, putProperty, readLock, readUnlock, remove, removeDocumentListener, removeUndoableEditListener, render, replace, setAsynchronousLoadPriority, setDocumentFilter, setDocumentProperties, writeLock, writeUnlock
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Field Detail
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tabSizeAttribute
public static final String tabSizeAttribute
Name of the attribute that specifies the tab size for tabs contained in the content. The type for the value is Integer.- See Also:
- Constant Field Values
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lineLimitAttribute
public static final String lineLimitAttribute
Name of the attribute that specifies the maximum length of a line, if there is a maximum length. The type for the value is Integer.- See Also:
- Constant Field Values
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Constructor Detail
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PlainDocument
public PlainDocument()
Constructs a plain text document. A default model usingGapContentis constructed and set.
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PlainDocument
public PlainDocument(AbstractDocument.Content c)
Constructs a plain text document. A default root element is created, and the tab size set to 8.- Parameters:
c- the container for the content
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Method Detail
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insertString
public void insertString(int offs, String str, AttributeSet a) throws BadLocationExceptionInserts some content into the document. Inserting content causes a write lock to be held while the actual changes are taking place, followed by notification to the observers on the thread that grabbed the write lock.This method is thread safe, although most Swing methods are not. Please see How to Use Threads for more information.
- Specified by:
insertStringin interfaceDocument- Overrides:
insertStringin classAbstractDocument- Parameters:
offs- the starting offset >= 0str- the string to insert; does nothing with null/empty stringsa- the attributes for the inserted content- Throws:
BadLocationException- the given insert position is not a valid position within the document- See Also:
Document.insertString(int, java.lang.String, javax.swing.text.AttributeSet)
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getDefaultRootElement
public Element getDefaultRootElement()
Gets the default root element for the document model.- Specified by:
getDefaultRootElementin interfaceDocument- Specified by:
getDefaultRootElementin classAbstractDocument- Returns:
- the root
- See Also:
Document.getDefaultRootElement()
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createDefaultRoot
protected AbstractDocument.AbstractElement createDefaultRoot()
Creates the root element to be used to represent the default document structure.- Returns:
- the element base
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getParagraphElement
public Element getParagraphElement(int pos)
Get the paragraph element containing the given position. Since this document only models lines, it returns the line instead.- Specified by:
getParagraphElementin classAbstractDocument- Parameters:
pos- the starting offset >= 0- Returns:
- the element
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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. Since this document simply maps out lines, we refresh the line map.- Overrides:
insertUpdatein classAbstractDocument- Parameters:
chng- the change event describing the ditattr- the set of attributes for the inserted text
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removeUpdate
protected void removeUpdate(AbstractDocument.DefaultDocumentEvent chng)
Updates any document structure as a result of text removal. This will happen within a write lock. Since the structure represents a line map, this just checks to see if the removal spans lines. If it does, the two lines outside of the removal area are joined together.- Overrides:
removeUpdatein classAbstractDocument- Parameters:
chng- the change event describing the edit
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Document heeft de 11/06/2005 gemaakt, de laatste keer de 04/03/2020 gewijzigd
Bron van het afgedrukte document:https://www.gaudry.be/nl/java-api-rf-javax/swing/text/plaindocument.html
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