/*

 * Copyright (c) 2002, 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

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 */

package javax.swing.plaf.synth;

import javax.swing.*;

import javax.swing.text.*;

import javax.swing.plaf.*;

import javax.swing.plaf.basic.BasicTextAreaUI;

import java.awt.*;

import java.awt.event.FocusListener;

import java.awt.event.FocusEvent;

import java.beans.PropertyChangeEvent;

/**

 * Provides the look and feel for a plain text editor in the

 * Synth look and feel. In this implementation the default UI

 * is extended to act as a simple view factory.

 * <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  Shannon Hickey

 * @since 1.7

 */

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

public class SynthTextAreaUI extends BasicTextAreaUI implements SynthUI {

    private Handler handler = new Handler();

    private SynthStyle style;

    /**

     * Creates a UI object for a JTextArea.

     *

     * @param ta a text area

     * @return the UI object

     */

    public static ComponentUI createUI(JComponent ta) {

        return new SynthTextAreaUI();

    }

    /**

     * {@inheritDoc}

     */

    @Override

    protected void installDefaults() {

        // Installs the text cursor on the component

        super.installDefaults();

        updateStyle(getComponent());

        getComponent().addFocusListener(handler);

    }

    /**

     * {@inheritDoc}

     */

    @Override

    protected void uninstallDefaults() {

        SynthContext context = getContext(getComponent(), ENABLED);

        getComponent().putClientProperty("caretAspectRatio", null);

        getComponent().removeFocusListener(handler);

        style.uninstallDefaults(context);

        context.dispose();

        style = null;

        super.uninstallDefaults();

    }

    private void updateStyle(JTextComponent comp) {

        SynthContext context = getContext(comp, ENABLED);

        SynthStyle oldStyle = style;

        style = SynthLookAndFeel.updateStyle(context, this);

        if (style != oldStyle) {

            SynthTextFieldUI.updateStyle(comp, context, getPropertyPrefix());

            if (oldStyle != null) {

                uninstallKeyboardActions();

                installKeyboardActions();

            }

        }

        context.dispose();

    }

    /**

     * {@inheritDoc}

     */

    @Override

    public SynthContext getContext(JComponent c) {

        return getContext(c, SynthLookAndFeel.getComponentState(c));

    }

    private SynthContext getContext(JComponent c, int state) {

        return SynthContext.getContext(c, style, state);

    }

    /**

     * Notifies this UI delegate to repaint the specified component.

     * This method paints the component background, then calls

     * the {@link #paint(SynthContext,Graphics)} method.

     *

     * <p>In general, this method does not need to be overridden by subclasses.

     * All Look and Feel rendering code should reside in the {@code paint} method.

     *

     * @param g the {@code Graphics} object used for painting

     * @param c the component being painted

     * @see #paint(SynthContext,Graphics)

     */

    @Override

    public void update(Graphics g, JComponent c) {

        SynthContext context = getContext(c);

        SynthLookAndFeel.update(context, g);

        context.getPainter().paintTextAreaBackground(context,

                          g, 0, 0, c.getWidth(), c.getHeight());

        paint(context, g);

        context.dispose();

    }

    /**

     * Paints the specified component.

     *

     * @param context context for the component being painted

     * @param g the {@code Graphics} object used for painting

     * @see #update(Graphics,JComponent)

     */

    protected void paint(SynthContext context, Graphics g) {

        super.paint(g, getComponent());

    }

    /**

     * {@inheritDoc}

     *

     * Overridden to do nothing.

     */

    @Override

    protected void paintBackground(Graphics g) {

        // Overriden to do nothing, all our painting is done from update/paint.

    }

    /**

     * {@inheritDoc}

     */

    @Override

    public void paintBorder(SynthContext context, Graphics g, int x,

                            int y, int w, int h) {

        context.getPainter().paintTextAreaBorder(context, g, x, y, w, h);

    }

    /**

     * 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 View when the

     * <em>WrapLine</em> or the <em>WrapStyleWord</em> property changes.

     *

     * @param evt the property change event

     */

    @Override

    protected void propertyChange(PropertyChangeEvent evt) {

        if (SynthLookAndFeel.shouldUpdateStyle(evt)) {

            updateStyle((JTextComponent)evt.getSource());

        }

        super.propertyChange(evt);

    }

    private final class Handler implements FocusListener {

        public void focusGained(FocusEvent e) {

            getComponent().repaint();

        }

        public void focusLost(FocusEvent e) {

            getComponent().repaint();

        }

    }

}