/*
 * Copyright (c) 1997, 2015, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 */
package javax.swing.text;

import java.io.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import javax.swing.event.*;
import javax.swing.Action;
import javax.swing.JEditorPane;
import javax.swing.KeyStroke;
import javax.swing.UIManager;

This is the set of things needed by a text component
to be a reasonably functioning editor for some type
of text document.  This implementation provides a default
implementation which treats text as styled text and
provides a minimal set of actions for editing styled text.
Author:
 Timothy Prinzing/**
 * This is the set of things needed by a text component
 * to be a reasonably functioning editor for some <em>type</em>
 * of text document.  This implementation provides a default
 * implementation which treats text as styled text and
 * provides a minimal set of actions for editing styled text.
 *
 * @author  Timothy Prinzing
 */
@SuppressWarnings("serial") // Same-version serialization only
public class StyledEditorKit extends DefaultEditorKit {

    
Creates a new EditorKit used for styled documents.
/**
     * Creates a new EditorKit used for styled documents.
     */
    public StyledEditorKit() {
        createInputAttributeUpdated();
        createInputAttributes();
    }

    
Gets the input attributes for the pane.  When
the caret moves and there is no selection, the
input attributes are automatically mutated to
reflect the character attributes of the current
caret location.  The styled editing actions
use the input attributes to carry out their
actions.
Returns:
the attribute set/**
     * Gets the input attributes for the pane.  When
     * the caret moves and there is no selection, the
     * input attributes are automatically mutated to
     * reflect the character attributes of the current
     * caret location.  The styled editing actions
     * use the input attributes to carry out their
     * actions.
     *
     * @return the attribute set
     */
    public MutableAttributeSet getInputAttributes() {
        return inputAttributes;
    }

    
Fetches the element representing the current
run of character attributes for the caret.
Returns:
the element/**
     * Fetches the element representing the current
     * run of character attributes for the caret.
     *
     * @return the element
     */
    public Element getCharacterAttributeRun() {
        return currentRun;
    }

    // --- EditorKit methods ---------------------------

    
Fetches the command list for the editor.  This is
the list of commands supported by the superclass
augmented by the collection of commands defined
locally for style operations.
Returns:
the command list/**
     * Fetches the command list for the editor.  This is
     * the list of commands supported by the superclass
     * augmented by the collection of commands defined
     * locally for style operations.
     *
     * @return the command list
     */
    public Action[] getActions() {
        return TextAction.augmentList(super.getActions(), defaultActions);
    }

    
Creates an uninitialized text storage model
that is appropriate for this type of editor.
Returns:
the model/**
     * Creates an uninitialized text storage model
     * that is appropriate for this type of editor.
     *
     * @return the model
     */
    public Document createDefaultDocument() {
        return new DefaultStyledDocument();
    }

    
Called when the kit is being installed into
a JEditorPane.
Params:
c – the JEditorPane/**
     * Called when the kit is being installed into
     * a JEditorPane.
     *
     * @param c the JEditorPane
     */
    public void install(JEditorPane c) {
        c.addCaretListener(inputAttributeUpdater);
        c.addPropertyChangeListener(inputAttributeUpdater);
        Caret caret = c.getCaret();
        if (caret != null) {
            inputAttributeUpdater.updateInputAttributes
                                  (caret.getDot(), caret.getMark(), c);
        }
    }

    
Called when the kit is being removed from the
JEditorPane.  This is used to unregister any
listeners that were attached.
Params:
c – the JEditorPane/**
     * Called when the kit is being removed from the
     * JEditorPane.  This is used to unregister any
     * listeners that were attached.
     *
     * @param c the JEditorPane
     */
    public void deinstall(JEditorPane c) {
        c.removeCaretListener(inputAttributeUpdater);
        c.removePropertyChangeListener(inputAttributeUpdater);

        // remove references to current document so it can be collected.
        currentRun = null;
        currentParagraph = null;
    }

   
Fetches a factory that is suitable for producing
views of any models that are produced by this
kit.  This is implemented to return View implementations
for the following kinds of elements:

AbstractDocument.ContentElementName
AbstractDocument.ParagraphElementName
AbstractDocument.SectionElementName
StyleConstants.ComponentElementName
StyleConstants.IconElementName

Returns:
the factory/**
     * Fetches a factory that is suitable for producing
     * views of any models that are produced by this
     * kit.  This is implemented to return View implementations
     * for the following kinds of elements:
     * <ul>
     * <li>AbstractDocument.ContentElementName
     * <li>AbstractDocument.ParagraphElementName
     * <li>AbstractDocument.SectionElementName
     * <li>StyleConstants.ComponentElementName
     * <li>StyleConstants.IconElementName
     * </ul>
     *
     * @return the factory
     */
    public ViewFactory getViewFactory() {
        return defaultFactory;
    }

    
Creates a copy of the editor kit.
Returns:
the copy/**
     * Creates a copy of the editor kit.
     *
     * @return the copy
     */
    public Object clone() {
        StyledEditorKit o = (StyledEditorKit)super.clone();
        o.currentRun = o.currentParagraph = null;
        o.createInputAttributeUpdated();
        o.createInputAttributes();
        return o;
    }

    
Creates the AttributeSet used for the selection.
/**
     * Creates the AttributeSet used for the selection.
     */
    @SuppressWarnings("serial") // anonymous class
    private void createInputAttributes() {
        inputAttributes = new SimpleAttributeSet() {
            public AttributeSet getResolveParent() {
                return (currentParagraph != null) ?
                           currentParagraph.getAttributes() : null;
            }

            public Object clone() {
                return new SimpleAttributeSet(this);
            }
        };
    }

    
Creates a new AttributeTracker.
/**
     * Creates a new <code>AttributeTracker</code>.
     */
    private void createInputAttributeUpdated() {
        inputAttributeUpdater = new AttributeTracker();
    }


    private static final ViewFactory defaultFactory = new StyledViewFactory();

    Element currentRun;
    Element currentParagraph;

    
This is the set of attributes used to store the
input attributes.
/**
     * This is the set of attributes used to store the
     * input attributes.
     */
    MutableAttributeSet inputAttributes;

    
This listener will be attached to the caret of
the text component that the EditorKit gets installed
into.  This should keep the input attributes updated
for use by the styled actions.
/**
     * This listener will be attached to the caret of
     * the text component that the EditorKit gets installed
     * into.  This should keep the input attributes updated
     * for use by the styled actions.
     */
    private AttributeTracker inputAttributeUpdater;

    
Tracks caret movement and keeps the input attributes set
to reflect the current set of attribute definitions at the
caret position.
This implements PropertyChangeListener to update the
input attributes when the Document changes, as if the Document
changes the attributes will almost certainly change.
/**
     * Tracks caret movement and keeps the input attributes set
     * to reflect the current set of attribute definitions at the
     * caret position.
     * <p>This implements PropertyChangeListener to update the
     * input attributes when the Document changes, as if the Document
     * changes the attributes will almost certainly change.
     */
    @SuppressWarnings("serial") // JDK-implementation class
    class AttributeTracker implements CaretListener, PropertyChangeListener, Serializable {

        
Updates the attributes. dot and mark
mark give the positions of the selection in c.
/**
         * Updates the attributes. <code>dot</code> and <code>mark</code>
         * mark give the positions of the selection in <code>c</code>.
         */
        void updateInputAttributes(int dot, int mark, JTextComponent c) {
            // EditorKit might not have installed the StyledDocument yet.
            Document aDoc = c.getDocument();
            if (!(aDoc instanceof StyledDocument)) {
                return ;
            }
            int start = Math.min(dot, mark);
            // record current character attributes.
            StyledDocument doc = (StyledDocument)aDoc;
            // If nothing is selected, get the attributes from the character
            // before the start of the selection, otherwise get the attributes
            // from the character element at the start of the selection.
            Element run;
            currentParagraph = doc.getParagraphElement(start);
            if (currentParagraph.getStartOffset() == start || dot != mark) {
                // Get the attributes from the character at the selection
                // if in a different paragrah!
                run = doc.getCharacterElement(start);
            }
            else {
                run = doc.getCharacterElement(Math.max(start-1, 0));
            }
            if (run != currentRun) {
                    /*
                     * PENDING(prinz) All attributes that represent a single
                     * glyph position and can't be inserted into should be
                     * removed from the input attributes... this requires
                     * mixing in an interface to indicate that condition.
                     * When we can add things again this logic needs to be
                     * improved!!
                     */
                currentRun = run;
                createInputAttributes(currentRun, getInputAttributes());
            }
        }

        public void propertyChange(PropertyChangeEvent evt) {
            Object newValue = evt.getNewValue();
            Object source = evt.getSource();

            if ((source instanceof JTextComponent) &&
                (newValue instanceof Document)) {
                // New document will have changed selection to 0,0.
                updateInputAttributes(0, 0, (JTextComponent)source);
            }
        }

        public void caretUpdate(CaretEvent e) {
            updateInputAttributes(e.getDot(), e.getMark(),
                                  (JTextComponent)e.getSource());
        }
    }

    
Copies the key/values in elements AttributeSet into
set. This does not copy component, icon, or element
names attributes. Subclasses may wish to refine what is and what
isn't copied here. But be sure to first remove all the attributes that
are in set.

This is called anytime the caret moves over a different location.
Params:
element – the element
set – the attributes/**
     * Copies the key/values in <code>element</code>s AttributeSet into
     * <code>set</code>. This does not copy component, icon, or element
     * names attributes. Subclasses may wish to refine what is and what
     * isn't copied here. But be sure to first remove all the attributes that
     * are in <code>set</code>.<p>
     * This is called anytime the caret moves over a different location.
     *
     * @param element the element
     * @param set the attributes
     */
    protected void createInputAttributes(Element element,
                                         MutableAttributeSet set) {
        if (element.getAttributes().getAttributeCount() > 0
            || element.getEndOffset() - element.getStartOffset() > 1
            || element.getEndOffset() < element.getDocument().getLength()) {
            set.removeAttributes(set);
            set.addAttributes(element.getAttributes());
            set.removeAttribute(StyleConstants.ComponentAttribute);
            set.removeAttribute(StyleConstants.IconAttribute);
            set.removeAttribute(AbstractDocument.ElementNameAttribute);
            set.removeAttribute(StyleConstants.ComposedTextAttribute);
        }
    }

    // ---- default ViewFactory implementation ---------------------

    static class StyledViewFactory implements ViewFactory {

        public View create(Element elem) {
            String kind = elem.getName();
            if (kind != null) {
                if (kind.equals(AbstractDocument.ContentElementName)) {
                    return new LabelView(elem);
                } else if (kind.equals(AbstractDocument.ParagraphElementName)) {
                    return new ParagraphView(elem);
                } else if (kind.equals(AbstractDocument.SectionElementName)) {
                    return new BoxView(elem, View.Y_AXIS);
                } else if (kind.equals(StyleConstants.ComponentElementName)) {
                    return new ComponentView(elem);
                } else if (kind.equals(StyleConstants.IconElementName)) {
                    return new IconView(elem);
                }
            }

            // default to text display
            return new LabelView(elem);
        }

    }

    // --- Action implementations ---------------------------------

    private static final Action[] defaultActions = {
        new FontFamilyAction("font-family-SansSerif", "SansSerif"),
        new FontFamilyAction("font-family-Monospaced", "Monospaced"),
        new FontFamilyAction("font-family-Serif", "Serif"),
        new FontSizeAction("font-size-8", 8),
        new FontSizeAction("font-size-10", 10),
        new FontSizeAction("font-size-12", 12),
        new FontSizeAction("font-size-14", 14),
        new FontSizeAction("font-size-16", 16),
        new FontSizeAction("font-size-18", 18),
        new FontSizeAction("font-size-24", 24),
        new FontSizeAction("font-size-36", 36),
        new FontSizeAction("font-size-48", 48),
        new AlignmentAction("left-justify", StyleConstants.ALIGN_LEFT),
        new AlignmentAction("center-justify", StyleConstants.ALIGN_CENTER),
        new AlignmentAction("right-justify", StyleConstants.ALIGN_RIGHT),
        new BoldAction(),
        new ItalicAction(),
        new StyledInsertBreakAction(),
        new UnderlineAction()
    };

    
An action that assumes it's being fired on a JEditorPane
with a StyledEditorKit (or subclass) installed.  This has
some convenience methods for causing character or paragraph
level attribute changes.  The convenience methods will
throw an IllegalArgumentException if the assumption of
a StyledDocument, a JEditorPane, or a StyledEditorKit
fail to be true.

The component that gets acted upon by the action
will be the source of the ActionEvent if the source
can be narrowed to a JEditorPane type.  If the source
can't be narrowed, the most recently focused text
component is changed.  If neither of these are the
case, the action cannot be performed.

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 JavaBeans™
has been added to the java.beans package. Please see XMLEncoder. /**
     * An action that assumes it's being fired on a JEditorPane
     * with a StyledEditorKit (or subclass) installed.  This has
     * some convenience methods for causing character or paragraph
     * level attribute changes.  The convenience methods will
     * throw an IllegalArgumentException if the assumption of
     * a StyledDocument, a JEditorPane, or a StyledEditorKit
     * fail to be true.
     * <p>
     * The component that gets acted upon by the action
     * will be the source of the ActionEvent if the source
     * can be narrowed to a JEditorPane type.  If the source
     * can't be narrowed, the most recently focused text
     * component is changed.  If neither of these are the
     * case, the action cannot be performed.
     * <p>
     * <strong>Warning:</strong>
     * 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 JavaBeans&trade;
     * has been added to the <code>java.beans</code> package.
     * Please see {@link java.beans.XMLEncoder}.
     */
    @SuppressWarnings("serial") // Same-version serialization only
    public abstract static class StyledTextAction extends TextAction {

        
Creates a new StyledTextAction from a string action name.
Params:
nm – the name of the action/**
         * Creates a new StyledTextAction from a string action name.
         *
         * @param nm the name of the action
         */
        public StyledTextAction(String nm) {
            super(nm);
        }

        
Gets the target editor for an action.
Params:
e – the action event
Returns:
the editor/**
         * Gets the target editor for an action.
         *
         * @param e the action event
         * @return the editor
         */
        protected final JEditorPane getEditor(ActionEvent e) {
            JTextComponent tcomp = getTextComponent(e);
            if (tcomp instanceof JEditorPane) {
                return (JEditorPane) tcomp;
            }
            return null;
        }

        
Gets the document associated with an editor pane.
Params:
e – the editor
Throws:
IllegalArgumentException – for the wrong document type
Returns:
the document/**
         * Gets the document associated with an editor pane.
         *
         * @param e the editor
         * @return the document
         * @exception IllegalArgumentException for the wrong document type
         */
        protected final StyledDocument getStyledDocument(JEditorPane e) {
            Document d = e.getDocument();
            if (d instanceof StyledDocument) {
                return (StyledDocument) d;
            }
            throw new IllegalArgumentException("document must be StyledDocument");
        }

        
Gets the editor kit associated with an editor pane.
Params:
e – the editor pane
Throws:
IllegalArgumentException – for the wrong document type
Returns:
the kit/**
         * Gets the editor kit associated with an editor pane.
         *
         * @param e the editor pane
         * @return the kit
         * @exception IllegalArgumentException for the wrong document type
         */
        protected final StyledEditorKit getStyledEditorKit(JEditorPane e) {
            EditorKit k = e.getEditorKit();
            if (k instanceof StyledEditorKit) {
                return (StyledEditorKit) k;
            }
            throw new IllegalArgumentException("EditorKit must be StyledEditorKit");
        }

        
Applies the given attributes to character
content.  If there is a selection, the attributes
are applied to the selection range.  If there
is no selection, the attributes are applied to
the input attribute set which defines the attributes
for any new text that gets inserted.
Params:
editor – the editor
attr – the attributes
replace –   if true, then replace the existing attributes first/**
         * Applies the given attributes to character
         * content.  If there is a selection, the attributes
         * are applied to the selection range.  If there
         * is no selection, the attributes are applied to
         * the input attribute set which defines the attributes
         * for any new text that gets inserted.
         *
         * @param editor the editor
         * @param attr the attributes
         * @param replace   if true, then replace the existing attributes first
         */
        protected final void setCharacterAttributes(JEditorPane editor,
                                              AttributeSet attr, boolean replace) {
            int p0 = editor.getSelectionStart();
            int p1 = editor.getSelectionEnd();
            if (p0 != p1) {
                StyledDocument doc = getStyledDocument(editor);
                doc.setCharacterAttributes(p0, p1 - p0, attr, replace);
            }
            StyledEditorKit k = getStyledEditorKit(editor);
            MutableAttributeSet inputAttributes = k.getInputAttributes();
            if (replace) {
                inputAttributes.removeAttributes(inputAttributes);
            }
            inputAttributes.addAttributes(attr);
        }

        
Applies the given attributes to paragraphs.  If
there is a selection, the attributes are applied
to the paragraphs that intersect the selection.
if there is no selection, the attributes are applied
to the paragraph at the current caret position.
Params:
editor – the editor
attr – the attributes
replace –   if true, replace the existing attributes first/**
         * Applies the given attributes to paragraphs.  If
         * there is a selection, the attributes are applied
         * to the paragraphs that intersect the selection.
         * if there is no selection, the attributes are applied
         * to the paragraph at the current caret position.
         *
         * @param editor the editor
         * @param attr the attributes
         * @param replace   if true, replace the existing attributes first
         */
        protected final void setParagraphAttributes(JEditorPane editor,
                                           AttributeSet attr, boolean replace) {
            int p0 = editor.getSelectionStart();
            int p1 = editor.getSelectionEnd();
            StyledDocument doc = getStyledDocument(editor);
            doc.setParagraphAttributes(p0, p1 - p0, attr, replace);
        }

    }

    
An action to set the font family in the associated
JEditorPane.  This will use the family specified as
the command string on the ActionEvent if there is one,
otherwise the family that was initialized with will be used.

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 JavaBeans™
has been added to the java.beans package. Please see XMLEncoder. /**
     * An action to set the font family in the associated
     * JEditorPane.  This will use the family specified as
     * the command string on the ActionEvent if there is one,
     * otherwise the family that was initialized with will be used.
     * <p>
     * <strong>Warning:</strong>
     * 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 JavaBeans&trade;
     * has been added to the <code>java.beans</code> package.
     * Please see {@link java.beans.XMLEncoder}.
     */
    @SuppressWarnings("serial") // Same-version serialization only
    public static class FontFamilyAction extends StyledTextAction {

        
Creates a new FontFamilyAction.
Params:
nm – the action name
family – the font family/**
         * Creates a new FontFamilyAction.
         *
         * @param nm the action name
         * @param family the font family
         */
        public FontFamilyAction(String nm, String family) {
            super(nm);
            this.family = family;
        }

        
Sets the font family.
Params:
e – the event/**
         * Sets the font family.
         *
         * @param e the event
         */
        public void actionPerformed(ActionEvent e) {
            JEditorPane editor = getEditor(e);
            if (editor != null) {
                String family = this.family;
                if ((e != null) && (e.getSource() == editor)) {
                    String s = e.getActionCommand();
                    if (s != null) {
                        family = s;
                    }
                }
                if (family != null) {
                    MutableAttributeSet attr = new SimpleAttributeSet();
                    StyleConstants.setFontFamily(attr, family);
                    setCharacterAttributes(editor, attr, false);
                } else {
                    UIManager.getLookAndFeel().provideErrorFeedback(editor);
                }
            }
        }

        private String family;
    }

    
An action to set the font size in the associated
JEditorPane.  This will use the size specified as
the command string on the ActionEvent if there is one,
otherwise the size that was initialized with will be used.

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 JavaBeans™
has been added to the java.beans package. Please see XMLEncoder. /**
     * An action to set the font size in the associated
     * JEditorPane.  This will use the size specified as
     * the command string on the ActionEvent if there is one,
     * otherwise the size that was initialized with will be used.
     * <p>
     * <strong>Warning:</strong>
     * 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 JavaBeans&trade;
     * has been added to the <code>java.beans</code> package.
     * Please see {@link java.beans.XMLEncoder}.
     */
    @SuppressWarnings("serial") // Same-version serialization only
    public static class FontSizeAction extends StyledTextAction {

        
Creates a new FontSizeAction.
Params:
nm – the action name
size – the font size/**
         * Creates a new FontSizeAction.
         *
         * @param nm the action name
         * @param size the font size
         */
        public FontSizeAction(String nm, int size) {
            super(nm);
            this.size = size;
        }

        
Sets the font size.
Params:
e – the action event/**
         * Sets the font size.
         *
         * @param e the action event
         */
        public void actionPerformed(ActionEvent e) {
            JEditorPane editor = getEditor(e);
            if (editor != null) {
                int size = this.size;
                if ((e != null) && (e.getSource() == editor)) {
                    String s = e.getActionCommand();
                    try {
                        size = Integer.parseInt(s, 10);
                    } catch (NumberFormatException nfe) {
                    }
                }
                if (size != 0) {
                    MutableAttributeSet attr = new SimpleAttributeSet();
                    StyleConstants.setFontSize(attr, size);
                    setCharacterAttributes(editor, attr, false);
                } else {
                    UIManager.getLookAndFeel().provideErrorFeedback(editor);
                }
            }
        }

        private int size;
    }

    
An action to set foreground color.  This sets the
StyleConstants.Foreground attribute for the
currently selected range of the target JEditorPane.
This is done by calling
StyledDocument.setCharacterAttributes
on the styled document associated with the target
JEditorPane.

If the target text component is specified as the
source of the ActionEvent and there is a command string,
the command string will be interpreted as the foreground
color.  It will be interpreted by called
Color.decode, and should therefore be
legal input for that method.

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 JavaBeans™
has been added to the java.beans package. Please see XMLEncoder. /**
     * An action to set foreground color.  This sets the
     * <code>StyleConstants.Foreground</code> attribute for the
     * currently selected range of the target JEditorPane.
     * This is done by calling
     * <code>StyledDocument.setCharacterAttributes</code>
     * on the styled document associated with the target
     * JEditorPane.
     * <p>
     * If the target text component is specified as the
     * source of the ActionEvent and there is a command string,
     * the command string will be interpreted as the foreground
     * color.  It will be interpreted by called
     * <code>Color.decode</code>, and should therefore be
     * legal input for that method.
     * <p>
     * <strong>Warning:</strong>
     * 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 JavaBeans&trade;
     * has been added to the <code>java.beans</code> package.
     * Please see {@link java.beans.XMLEncoder}.
     */
    @SuppressWarnings("serial") // Same-version serialization only
    public static class ForegroundAction extends StyledTextAction {

        
Creates a new ForegroundAction.
Params:
nm – the action name
fg – the foreground color/**
         * Creates a new ForegroundAction.
         *
         * @param nm the action name
         * @param fg the foreground color
         */
        public ForegroundAction(String nm, Color fg) {
            super(nm);
            this.fg = fg;
        }

        
Sets the foreground color.
Params:
e – the action event/**
         * Sets the foreground color.
         *
         * @param e the action event
         */
        public void actionPerformed(ActionEvent e) {
            JEditorPane editor = getEditor(e);
            if (editor != null) {
                Color fg = this.fg;
                if ((e != null) && (e.getSource() == editor)) {
                    String s = e.getActionCommand();
                    try {
                        fg = Color.decode(s);
                    } catch (NumberFormatException nfe) {
                    }
                }
                if (fg != null) {
                    MutableAttributeSet attr = new SimpleAttributeSet();
                    StyleConstants.setForeground(attr, fg);
                    setCharacterAttributes(editor, attr, false);
                } else {
                    UIManager.getLookAndFeel().provideErrorFeedback(editor);
                }
            }
        }

        private Color fg;
    }

    
An action to set paragraph alignment.  This sets the
StyleConstants.Alignment attribute for the
currently selected range of the target JEditorPane.
This is done by calling
StyledDocument.setParagraphAttributes
on the styled document associated with the target
JEditorPane.

If the target text component is specified as the
source of the ActionEvent and there is a command string,
the command string will be interpreted as an integer
that should be one of the legal values for the
StyleConstants.Alignment attribute.

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 JavaBeans™
has been added to the java.beans package. Please see XMLEncoder. /**
     * An action to set paragraph alignment.  This sets the
     * <code>StyleConstants.Alignment</code> attribute for the
     * currently selected range of the target JEditorPane.
     * This is done by calling
     * <code>StyledDocument.setParagraphAttributes</code>
     * on the styled document associated with the target
     * JEditorPane.
     * <p>
     * If the target text component is specified as the
     * source of the ActionEvent and there is a command string,
     * the command string will be interpreted as an integer
     * that should be one of the legal values for the
     * <code>StyleConstants.Alignment</code> attribute.
     * <p>
     * <strong>Warning:</strong>
     * 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 JavaBeans&trade;
     * has been added to the <code>java.beans</code> package.
     * Please see {@link java.beans.XMLEncoder}.
     */
    @SuppressWarnings("serial") // Same-version serialization only
    public static class AlignmentAction extends StyledTextAction {

        
Creates a new AlignmentAction.
Params:
nm – the action name
a – the alignment >= 0/**
         * Creates a new AlignmentAction.
         *
         * @param nm the action name
         * @param a the alignment &gt;= 0
         */
        public AlignmentAction(String nm, int a) {
            super(nm);
            this.a = a;
        }

        
Sets the alignment.
Params:
e – the action event/**
         * Sets the alignment.
         *
         * @param e the action event
         */
        public void actionPerformed(ActionEvent e) {
            JEditorPane editor = getEditor(e);
            if (editor != null) {
                int a = this.a;
                if ((e != null) && (e.getSource() == editor)) {
                    String s = e.getActionCommand();
                    try {
                        a = Integer.parseInt(s, 10);
                    } catch (NumberFormatException nfe) {
                    }
                }
                MutableAttributeSet attr = new SimpleAttributeSet();
                StyleConstants.setAlignment(attr, a);
                setParagraphAttributes(editor, attr, false);
            }
        }

        private int a;
    }

    
An action to toggle the bold attribute.

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 JavaBeans™
has been added to the java.beans package. Please see XMLEncoder. /**
     * An action to toggle the bold attribute.
     * <p>
     * <strong>Warning:</strong>
     * 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 JavaBeans&trade;
     * has been added to the <code>java.beans</code> package.
     * Please see {@link java.beans.XMLEncoder}.
     */
    @SuppressWarnings("serial") // Same-version serialization only
    public static class BoldAction extends StyledTextAction {

        
Constructs a new BoldAction.
/**
         * Constructs a new BoldAction.
         */
        public BoldAction() {
            super("font-bold");
        }

        
Toggles the bold attribute.
Params:
e – the action event/**
         * Toggles the bold attribute.
         *
         * @param e the action event
         */
        public void actionPerformed(ActionEvent e) {
            JEditorPane editor = getEditor(e);
            if (editor != null) {
                StyledEditorKit kit = getStyledEditorKit(editor);
                MutableAttributeSet attr = kit.getInputAttributes();
                boolean bold = (StyleConstants.isBold(attr)) ? false : true;
                SimpleAttributeSet sas = new SimpleAttributeSet();
                StyleConstants.setBold(sas, bold);
                setCharacterAttributes(editor, sas, false);
            }
        }
    }

    
An action to toggle the italic attribute.

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 JavaBeans™
has been added to the java.beans package. Please see XMLEncoder. /**
     * An action to toggle the italic attribute.
     * <p>
     * <strong>Warning:</strong>
     * 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 JavaBeans&trade;
     * has been added to the <code>java.beans</code> package.
     * Please see {@link java.beans.XMLEncoder}.
     */
    @SuppressWarnings("serial") // Same-version serialization only
    public static class ItalicAction extends StyledTextAction {

        
Constructs a new ItalicAction.
/**
         * Constructs a new ItalicAction.
         */
        public ItalicAction() {
            super("font-italic");
        }

        
Toggles the italic attribute.
Params:
e – the action event/**
         * Toggles the italic attribute.
         *
         * @param e the action event
         */
        public void actionPerformed(ActionEvent e) {
            JEditorPane editor = getEditor(e);
            if (editor != null) {
                StyledEditorKit kit = getStyledEditorKit(editor);
                MutableAttributeSet attr = kit.getInputAttributes();
                boolean italic = (StyleConstants.isItalic(attr)) ? false : true;
                SimpleAttributeSet sas = new SimpleAttributeSet();
                StyleConstants.setItalic(sas, italic);
                setCharacterAttributes(editor, sas, false);
            }
        }
    }

    
An action to toggle the underline attribute.

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 JavaBeans™
has been added to the java.beans package. Please see XMLEncoder. /**
     * An action to toggle the underline attribute.
     * <p>
     * <strong>Warning:</strong>
     * 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 JavaBeans&trade;
     * has been added to the <code>java.beans</code> package.
     * Please see {@link java.beans.XMLEncoder}.
     */
    @SuppressWarnings("serial") // Same-version serialization only
    public static class UnderlineAction extends StyledTextAction {

        
Constructs a new UnderlineAction.
/**
         * Constructs a new UnderlineAction.
         */
        public UnderlineAction() {
            super("font-underline");
        }

        
Toggles the Underline attribute.
Params:
e – the action event/**
         * Toggles the Underline attribute.
         *
         * @param e the action event
         */
        public void actionPerformed(ActionEvent e) {
            JEditorPane editor = getEditor(e);
            if (editor != null) {
                StyledEditorKit kit = getStyledEditorKit(editor);
                MutableAttributeSet attr = kit.getInputAttributes();
                boolean underline = (StyleConstants.isUnderline(attr)) ? false : true;
                SimpleAttributeSet sas = new SimpleAttributeSet();
                StyleConstants.setUnderline(sas, underline);
                setCharacterAttributes(editor, sas, false);
            }
        }
    }


    
StyledInsertBreakAction has similar behavior to that of
DefaultEditorKit.InsertBreakAction. That is when
its actionPerformed method is invoked, a newline
is inserted. Beyond that, this will reset the input attributes to
what they were before the newline was inserted.
/**
     * StyledInsertBreakAction has similar behavior to that of
     * <code>DefaultEditorKit.InsertBreakAction</code>. That is when
     * its <code>actionPerformed</code> method is invoked, a newline
     * is inserted. Beyond that, this will reset the input attributes to
     * what they were before the newline was inserted.
     */
    @SuppressWarnings("serial") // Superclass is not serializable across versions
    static class StyledInsertBreakAction extends StyledTextAction {
        private SimpleAttributeSet tempSet;

        StyledInsertBreakAction() {
            super(insertBreakAction);
        }

        public void actionPerformed(ActionEvent e) {
            JEditorPane target = getEditor(e);

            if (target != null) {
                if ((!target.isEditable()) || (!target.isEnabled())) {
                    UIManager.getLookAndFeel().provideErrorFeedback(target);
                    return;
                }
                StyledEditorKit sek = getStyledEditorKit(target);

                if (tempSet != null) {
                    tempSet.removeAttributes(tempSet);
                }
                else {
                    tempSet = new SimpleAttributeSet();
                }
                tempSet.addAttributes(sek.getInputAttributes());
                target.replaceSelection("\n");

                MutableAttributeSet ia = sek.getInputAttributes();

                ia.removeAttributes(ia);
                ia.addAttributes(tempSet);
                tempSet.removeAttributes(tempSet);
            }
            else {
                // See if we are in a JTextComponent.
                JTextComponent text = getTextComponent(e);

                if (text != null) {
                    if ((!text.isEditable()) || (!text.isEnabled())) {
                        UIManager.getLookAndFeel().provideErrorFeedback(target);
                        return;
                    }
                    text.replaceSelection("\n");
                }
            }
        }
    }
}