/*

 * Copyright (c) 1997, 2014, 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

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

package javax.swing.plaf.basic;

import java.awt.*;

import java.awt.event.*;

import java.beans.*;

import java.net.URL;

import java.net.MalformedURLException;

import javax.swing.*;

import javax.swing.text.*;

import javax.swing.text.html.*;

import javax.swing.plaf.*;

import javax.swing.border.*;

/**

 * Provides the look and feel for a JEditorPane.

 * <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™

 * has been added to the <code>java.beans</code> package.

 * Please see {@link java.beans.XMLEncoder}.

 *

 * @author  Timothy Prinzing

 */

@SuppressWarnings("serial") // Same-version serialization only

public class BasicEditorPaneUI extends BasicTextUI {

    /**

     * Creates a UI for the JTextPane.

     *

     * @param c the JTextPane component

     * @return the UI

     */

    public static ComponentUI createUI(JComponent c) {

        return new BasicEditorPaneUI();

    }

    /**

     * Creates a new BasicEditorPaneUI.

     */

    public BasicEditorPaneUI() {

        super();

    }

    /**

     * Fetches the name used as a key to lookup properties through the

     * UIManager.  This is used as a prefix to all the standard

     * text properties.

     *

     * @return the name ("EditorPane")

     */

    protected String getPropertyPrefix() {

        return "EditorPane";

    }

    /**

     *{@inheritDoc}

     *

     * @since 1.5

     */

    public void installUI(JComponent c) {

        super.installUI(c);

        updateDisplayProperties(c.getFont(),

                                c.getForeground());

    }

    /**

     *{@inheritDoc}

     *

     * @since 1.5

     */

    public void uninstallUI(JComponent c) {

        cleanDisplayProperties();

        super.uninstallUI(c);

    }

    /**

     * Fetches the EditorKit for the UI.  This is whatever is

     * currently set in the associated JEditorPane.

     *

     * @return the editor capabilities

     * @see TextUI#getEditorKit

     */

    public EditorKit getEditorKit(JTextComponent tc) {

        JEditorPane pane = (JEditorPane) getComponent();

        return pane.getEditorKit();

    }

    /**

     * Fetch an action map to use.  The map for a JEditorPane

     * is not shared because it changes with the EditorKit.

     */

    ActionMap getActionMap() {

        ActionMap am = new ActionMapUIResource();

        am.put("requestFocus", new FocusAction());

        EditorKit editorKit = getEditorKit(getComponent());

        if (editorKit != null) {

            Action[] actions = editorKit.getActions();

            if (actions != null) {

                addActions(am, actions);

            }

        }

        am.put(TransferHandler.getCutAction().getValue(Action.NAME),

                TransferHandler.getCutAction());

        am.put(TransferHandler.getCopyAction().getValue(Action.NAME),

                TransferHandler.getCopyAction());

        am.put(TransferHandler.getPasteAction().getValue(Action.NAME),

                TransferHandler.getPasteAction());

        return am;

    }

    /**

     * This method gets called when a bound property is changed

     * on the associated JTextComponent.  This is a hook

     * which UI implementations may change to reflect how the

     * UI displays bound properties of JTextComponent subclasses.

     * This is implemented to rebuild the ActionMap based upon an

     * EditorKit change.

     *

     * @param evt the property change event

     */

    protected void propertyChange(PropertyChangeEvent evt) {

        super.propertyChange(evt);

        String name = evt.getPropertyName();

        if ("editorKit".equals(name)) {

            ActionMap map = SwingUtilities.getUIActionMap(getComponent());

            if (map != null) {

                Object oldValue = evt.getOldValue();

                if (oldValue instanceof EditorKit) {

                    Action[] actions = ((EditorKit)oldValue).getActions();

                    if (actions != null) {

                        removeActions(map, actions);

                    }

                }

                Object newValue = evt.getNewValue();

                if (newValue instanceof EditorKit) {

                    Action[] actions = ((EditorKit)newValue).getActions();

                    if (actions != null) {

                        addActions(map, actions);

                    }

                }

            }

            updateFocusTraversalKeys();

        } else if ("editable".equals(name)) {

            updateFocusTraversalKeys();

        } else if ("foreground".equals(name)

                   || "font".equals(name)

                   || "document".equals(name)

                   || JEditorPane.W3C_LENGTH_UNITS.equals(name)

                   || JEditorPane.HONOR_DISPLAY_PROPERTIES.equals(name)

                   ) {

            JComponent c = getComponent();

            updateDisplayProperties(c.getFont(), c.getForeground());

            if ( JEditorPane.W3C_LENGTH_UNITS.equals(name)

                 || JEditorPane.HONOR_DISPLAY_PROPERTIES.equals(name) ) {

                modelChanged();

            }

            if ("foreground".equals(name)) {

                Object honorDisplayPropertiesObject = c.

                    getClientProperty(JEditorPane.HONOR_DISPLAY_PROPERTIES);

                boolean honorDisplayProperties = false;

                if (honorDisplayPropertiesObject instanceof Boolean) {

                    honorDisplayProperties =

                        ((Boolean)honorDisplayPropertiesObject).booleanValue();

                }

                if (honorDisplayProperties) {

                    modelChanged();

                }

            }

        }

    }

    void removeActions(ActionMap map, Action[] actions) {

        int n = actions.length;

        for (int i = 0; i < n; i++) {

            Action a = actions[i];

            map.remove(a.getValue(Action.NAME));

        }

    }

    void addActions(ActionMap map, Action[] actions) {

        int n = actions.length;

        for (int i = 0; i < n; i++) {

            Action a = actions[i];

            map.put(a.getValue(Action.NAME), a);

        }

    }

    void updateDisplayProperties(Font font, Color fg) {

        JComponent c = getComponent();

        Object honorDisplayPropertiesObject = c.

            getClientProperty(JEditorPane.HONOR_DISPLAY_PROPERTIES);

        boolean honorDisplayProperties = false;

        Object w3cLengthUnitsObject = c.getClientProperty(JEditorPane.

                                                          W3C_LENGTH_UNITS);

        boolean w3cLengthUnits = false;

        if (honorDisplayPropertiesObject instanceof Boolean) {

            honorDisplayProperties =

                ((Boolean)honorDisplayPropertiesObject).booleanValue();

        }

        if (w3cLengthUnitsObject instanceof Boolean) {

            w3cLengthUnits = ((Boolean)w3cLengthUnitsObject).booleanValue();

        }

        if (this instanceof BasicTextPaneUI

            || honorDisplayProperties) {

             //using equals because can not use UIResource for Boolean

            Document doc = getComponent().getDocument();

            if (doc instanceof StyledDocument) {

                if (doc instanceof HTMLDocument

                    && honorDisplayProperties) {

                    updateCSS(font, fg);

                } else {

                    updateStyle(font, fg);

                }

            }

        } else {

            cleanDisplayProperties();

        }

        if ( w3cLengthUnits ) {

            Document doc = getComponent().getDocument();

            if (doc instanceof HTMLDocument) {

                StyleSheet documentStyleSheet =

                    ((HTMLDocument)doc).getStyleSheet();

                documentStyleSheet.addRule("W3C_LENGTH_UNITS_ENABLE");

            }

        } else {

            Document doc = getComponent().getDocument();

            if (doc instanceof HTMLDocument) {

                StyleSheet documentStyleSheet =

                    ((HTMLDocument)doc).getStyleSheet();

                documentStyleSheet.addRule("W3C_LENGTH_UNITS_DISABLE");

            }

        }

    }

    /**

     * Attribute key to reference the default font.

     * used in javax.swing.text.StyleContext.getFont

     * to resolve the default font.

     */

    private static final String FONT_ATTRIBUTE_KEY = "FONT_ATTRIBUTE_KEY";

    void cleanDisplayProperties() {

        Document document = getComponent().getDocument();

        if (document instanceof HTMLDocument) {

            StyleSheet documentStyleSheet =

                ((HTMLDocument)document).getStyleSheet();

            StyleSheet[] styleSheets = documentStyleSheet.getStyleSheets();

            if (styleSheets != null) {

                for (StyleSheet s : styleSheets) {

                    if (s instanceof StyleSheetUIResource) {

                        documentStyleSheet.removeStyleSheet(s);

                        documentStyleSheet.addRule("BASE_SIZE_DISABLE");

                        break;

                    }

                }

            }

            Style style = ((StyledDocument) document).getStyle(StyleContext.DEFAULT_STYLE);

            if (style.getAttribute(FONT_ATTRIBUTE_KEY) != null) {

                style.removeAttribute(FONT_ATTRIBUTE_KEY);

            }

        }

    }

    static class StyleSheetUIResource extends StyleSheet implements UIResource {

    }

    private void updateCSS(Font font, Color fg) {

        JTextComponent component = getComponent();

        Document document = component.getDocument();

        if (document instanceof HTMLDocument) {

            StyleSheet styleSheet = new StyleSheetUIResource();

            StyleSheet documentStyleSheet =

                ((HTMLDocument)document).getStyleSheet();

            StyleSheet[] styleSheets = documentStyleSheet.getStyleSheets();

            if (styleSheets != null) {

                for (StyleSheet s : styleSheets) {

                    if (s instanceof StyleSheetUIResource) {

                        documentStyleSheet.removeStyleSheet(s);

                    }

                }

            }

            String cssRule = sun.swing.

                SwingUtilities2.displayPropertiesToCSS(font,

                                                       fg);

            styleSheet.addRule(cssRule);

            documentStyleSheet.addStyleSheet(styleSheet);

            documentStyleSheet.addRule("BASE_SIZE " +

                                       component.getFont().getSize());

            Style style = ((StyledDocument) document).getStyle(StyleContext.DEFAULT_STYLE);

            if (! font.equals(style.getAttribute(FONT_ATTRIBUTE_KEY))) {

                style.addAttribute(FONT_ATTRIBUTE_KEY, font);

            }

        }

    }

    private void updateStyle(Font font, Color fg) {

        updateFont(font);

        updateForeground(fg);

    }

    /**

     * Update the color in the default style of the document.

     *

     * @param color the new color to use or null to remove the color attribute

     *              from the document's style

     */

    private void updateForeground(Color color) {

        StyledDocument doc = (StyledDocument)getComponent().getDocument();

        Style style = doc.getStyle(StyleContext.DEFAULT_STYLE);

        if (style == null) {

            return;

        }

        if (color == null) {

            if (style.getAttribute(StyleConstants.Foreground) != null) {

                style.removeAttribute(StyleConstants.Foreground);

            }

        } else {

            if (! color.equals(StyleConstants.getForeground(style))) {

                StyleConstants.setForeground(style, color);

            }

        }

    }

    /**

     * Update the font in the default style of the document.

     *

     * @param font the new font to use or null to remove the font attribute

     *             from the document's style

     */

    private void updateFont(Font font) {

        StyledDocument doc = (StyledDocument)getComponent().getDocument();

        Style style = doc.getStyle(StyleContext.DEFAULT_STYLE);

        if (style == null) {

            return;

        }

        String fontFamily = (String) style.getAttribute(StyleConstants.FontFamily);

        Integer fontSize = (Integer) style.getAttribute(StyleConstants.FontSize);

        Boolean isBold = (Boolean) style.getAttribute(StyleConstants.Bold);

        Boolean isItalic = (Boolean) style.getAttribute(StyleConstants.Italic);

        Font  fontAttribute = (Font) style.getAttribute(FONT_ATTRIBUTE_KEY);

        if (font == null) {

            if (fontFamily != null) {

                style.removeAttribute(StyleConstants.FontFamily);

            }

            if (fontSize != null) {

                style.removeAttribute(StyleConstants.FontSize);

            }

            if (isBold != null) {

                style.removeAttribute(StyleConstants.Bold);

            }

            if (isItalic != null) {

                style.removeAttribute(StyleConstants.Italic);

            }

            if (fontAttribute != null) {

                style.removeAttribute(FONT_ATTRIBUTE_KEY);

           }

        } else {

            if (! font.getName().equals(fontFamily)) {

                StyleConstants.setFontFamily(style, font.getName());

            }

            if (fontSize == null

                  || fontSize.intValue() != font.getSize()) {

                StyleConstants.setFontSize(style, font.getSize());

            }

            if (isBold == null

                  || isBold.booleanValue() != font.isBold()) {

                StyleConstants.setBold(style, font.isBold());

            }

            if (isItalic == null

                  || isItalic.booleanValue() != font.isItalic()) {

                StyleConstants.setItalic(style, font.isItalic());

            }

            if (! font.equals(fontAttribute)) {

                style.addAttribute(FONT_ATTRIBUTE_KEY, font);

            }

        }

    }

}