/*

 * Copyright 1997-2007 Sun Microsystems, Inc.  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.  Sun designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

 * CA 95054 USA or visit www.sun.com if you need additional information or

 * have any questions.

 */

package javax.swing.plaf.basic;

import java.awt.Component;

import java.awt.event.*;

import java.awt.FontMetrics;

import java.awt.Graphics;

import java.awt.Dimension;

import java.awt.Rectangle;

import java.awt.Insets;

import java.awt.Color;

import java.awt.IllegalComponentStateException;

import java.awt.Polygon;

import java.beans.*;

import java.util.Dictionary;

import java.util.Enumeration;

import javax.swing.*;

import javax.swing.event.*;

import javax.swing.plaf.*;

import sun.swing.DefaultLookup;

import sun.swing.UIAction;

/**

 * A Basic L&F implementation of SliderUI.

 *

 * @author Tom Santos

 */

public class BasicSliderUI extends SliderUI{

    // Old actions forward to an instance of this.

    private static final Actions SHARED_ACTION = new Actions();

    public static final int POSITIVE_SCROLL = +1;

    public static final int NEGATIVE_SCROLL = -1;

    public static final int MIN_SCROLL = -2;

    public static final int MAX_SCROLL = +2;

    protected Timer scrollTimer;

    protected JSlider slider;

    protected Insets focusInsets = null;

    protected Insets insetCache = null;

    protected boolean leftToRightCache = true;

    protected Rectangle focusRect = null;

    protected Rectangle contentRect = null;

    protected Rectangle labelRect = null;

    protected Rectangle tickRect = null;

    protected Rectangle trackRect = null;

    protected Rectangle thumbRect = null;

    protected int trackBuffer = 0;  // The distance that the track is from the side of the control

    private transient boolean isDragging;

    protected TrackListener trackListener;

    protected ChangeListener changeListener;

    protected ComponentListener componentListener;

    protected FocusListener focusListener;

    protected ScrollListener scrollListener;

    protected PropertyChangeListener propertyChangeListener;

    private Handler handler;

    private int lastValue;

    // Colors

    private Color shadowColor;

    private Color highlightColor;

    private Color focusColor;

    /**

     * Whther or not sameLabelBaselines is up to date.

     */

    private boolean checkedLabelBaselines;

    /**

     * Whether or not all the entries in the labeltable have the same

     * baseline.

     */

    private boolean sameLabelBaselines;

    protected Color getShadowColor() {

        return shadowColor;

    }

    protected Color getHighlightColor() {

        return highlightColor;

    }

    protected Color getFocusColor() {

        return focusColor;

    }

    /**

     * Returns true if the user is dragging the slider.

     *

     * @return true if the user is dragging the slider

     * @since 1.5

     */

    protected boolean isDragging() {

        return isDragging;

    }

    /////////////////////////////////////////////////////////////////////////////

    // ComponentUI Interface Implementation methods

    /////////////////////////////////////////////////////////////////////////////

    public static ComponentUI createUI(JComponent b)    {

        return new BasicSliderUI((JSlider)b);

    }

    public BasicSliderUI(JSlider b)   {

    }

    public void installUI(JComponent c)   {

        slider = (JSlider) c;

        checkedLabelBaselines = false;

        slider.setEnabled(slider.isEnabled());

        LookAndFeel.installProperty(slider, "opaque", Boolean.TRUE);

        isDragging = false;

        trackListener = createTrackListener( slider );

        changeListener = createChangeListener( slider );

        componentListener = createComponentListener( slider );

        focusListener = createFocusListener( slider );

        scrollListener = createScrollListener( slider );

        propertyChangeListener = createPropertyChangeListener( slider );

        installDefaults( slider );

        installListeners( slider );

        installKeyboardActions( slider );

        scrollTimer = new Timer( 100, scrollListener );

        scrollTimer.setInitialDelay( 300 );

        insetCache = slider.getInsets();

        leftToRightCache = BasicGraphicsUtils.isLeftToRight(slider);

        focusRect = new Rectangle();

        contentRect = new Rectangle();

        labelRect = new Rectangle();

        tickRect = new Rectangle();

        trackRect = new Rectangle();

        thumbRect = new Rectangle();

        lastValue = slider.getValue();

        calculateGeometry(); // This figures out where the labels, ticks, track, and thumb are.

    }

    public void uninstallUI(JComponent c) {

        if ( c != slider )

            throw new IllegalComponentStateException(

                                                    this + " was asked to deinstall() "

                                                    + c + " when it only knows about "

                                                    + slider + ".");

        LookAndFeel.uninstallBorder(slider);

        scrollTimer.stop();

        scrollTimer = null;

        uninstallListeners( slider );

        uninstallKeyboardActions(slider);

        focusInsets = null;

        insetCache = null;

        leftToRightCache = true;

        focusRect = null;

        contentRect = null;

        labelRect = null;

        tickRect = null;

        trackRect = null;

        thumbRect = null;

        trackListener = null;

        changeListener = null;

        componentListener = null;

        focusListener = null;

        scrollListener = null;

        propertyChangeListener = null;

        slider = null;

    }

    protected void installDefaults( JSlider slider ) {

        LookAndFeel.installBorder(slider, "Slider.border");

        LookAndFeel.installColorsAndFont(slider, "Slider.background",

                                         "Slider.foreground", "Slider.font");

        highlightColor = UIManager.getColor("Slider.highlight");

        shadowColor = UIManager.getColor("Slider.shadow");

        focusColor = UIManager.getColor("Slider.focus");

        focusInsets = (Insets)UIManager.get( "Slider.focusInsets" );

    }

    protected TrackListener createTrackListener(JSlider slider) {

        return new TrackListener();

    }

    protected ChangeListener createChangeListener(JSlider slider) {

        return getHandler();

    }

    protected ComponentListener createComponentListener(JSlider slider) {

        return getHandler();

    }

    protected FocusListener createFocusListener(JSlider slider) {

        return getHandler();

    }

    protected ScrollListener createScrollListener( JSlider slider ) {

        return new ScrollListener();

    }

    protected PropertyChangeListener createPropertyChangeListener(

            JSlider slider) {

        return getHandler();

    }

    private Handler getHandler() {

        if (handler == null) {

            handler = new Handler();

        }

        return handler;

    }

    protected void installListeners( JSlider slider ) {

        slider.addMouseListener(trackListener);

        slider.addMouseMotionListener(trackListener);

        slider.addFocusListener(focusListener);

        slider.addComponentListener(componentListener);

        slider.addPropertyChangeListener( propertyChangeListener );

        slider.getModel().addChangeListener(changeListener);

    }

    protected void uninstallListeners( JSlider slider ) {

        slider.removeMouseListener(trackListener);

        slider.removeMouseMotionListener(trackListener);

        slider.removeFocusListener(focusListener);

        slider.removeComponentListener(componentListener);

        slider.removePropertyChangeListener( propertyChangeListener );

        slider.getModel().removeChangeListener(changeListener);

        handler = null;

    }

    protected void installKeyboardActions( JSlider slider ) {

        InputMap km = getInputMap(JComponent.WHEN_FOCUSED, slider);

        SwingUtilities.replaceUIInputMap(slider, JComponent.WHEN_FOCUSED, km);

        LazyActionMap.installLazyActionMap(slider, BasicSliderUI.class,

                "Slider.actionMap");

    }

    InputMap getInputMap(int condition, JSlider slider) {

        if (condition == JComponent.WHEN_FOCUSED) {

            InputMap keyMap = (InputMap)DefaultLookup.get(slider, this,

                  "Slider.focusInputMap");

            InputMap rtlKeyMap;

            if (slider.getComponentOrientation().isLeftToRight() ||

                ((rtlKeyMap = (InputMap)DefaultLookup.get(slider, this,

                          "Slider.focusInputMap.RightToLeft")) == null)) {

                return keyMap;

            } else {

                rtlKeyMap.setParent(keyMap);

                return rtlKeyMap;

            }

        }

        return null;

    }

    /**

     * Populates ComboBox's actions.

     */

    static void loadActionMap(LazyActionMap map) {

        map.put(new Actions(Actions.POSITIVE_UNIT_INCREMENT));

        map.put(new Actions(Actions.POSITIVE_BLOCK_INCREMENT));

        map.put(new Actions(Actions.NEGATIVE_UNIT_INCREMENT));

        map.put(new Actions(Actions.NEGATIVE_BLOCK_INCREMENT));

        map.put(new Actions(Actions.MIN_SCROLL_INCREMENT));

        map.put(new Actions(Actions.MAX_SCROLL_INCREMENT));

    }

    protected void uninstallKeyboardActions( JSlider slider ) {

        SwingUtilities.replaceUIActionMap(slider, null);

        SwingUtilities.replaceUIInputMap(slider, JComponent.WHEN_FOCUSED,

                                         null);

    }

    /**

     * Returns the baseline.

     *

     * @throws NullPointerException {@inheritDoc}

     * @throws IllegalArgumentException {@inheritDoc}

     * @see javax.swing.JComponent#getBaseline(int, int)

     * @since 1.6

     */

    public int getBaseline(JComponent c, int width, int height) {

        super.getBaseline(c, width, height);

        if (slider.getPaintLabels() && labelsHaveSameBaselines()) {

            FontMetrics metrics = slider.getFontMetrics(slider.getFont());

            Insets insets = slider.getInsets();

            Dimension thumbSize = getThumbSize();

            if (slider.getOrientation() == JSlider.HORIZONTAL) {

                int tickLength = getTickLength();

                int contentHeight = height - insets.top - insets.bottom -

                    focusInsets.top - focusInsets.bottom;

                int thumbHeight = thumbSize.height;

                int centerSpacing = thumbHeight;

                if (slider.getPaintTicks()) {

                    centerSpacing += tickLength;

                }

                // Assume uniform labels.

                centerSpacing += getHeightOfTallestLabel();

                int trackY = insets.top + focusInsets.top +

                    (contentHeight - centerSpacing - 1) / 2;

                int trackHeight = thumbHeight;

                int tickY = trackY + trackHeight;

                int tickHeight = tickLength;

                if (!slider.getPaintTicks()) {

                    tickHeight = 0;

                }

                int labelY = tickY + tickHeight;

                return labelY + metrics.getAscent();

            }

            else { // vertical

                boolean inverted = slider.getInverted();

                Integer value = inverted ? getLowestValue() :

                                           getHighestValue();

                if (value != null) {

                    int thumbHeight = thumbSize.height;

                    int trackBuffer = Math.max(metrics.getHeight() / 2,

                                               thumbHeight / 2);

                    int contentY = focusInsets.top + insets.top;

                    int trackY = contentY + trackBuffer;

                    int trackHeight = height - focusInsets.top -

                        focusInsets.bottom - insets.top - insets.bottom -

                        trackBuffer - trackBuffer;

                    int yPosition = yPositionForValue(value, trackY,

                                                      trackHeight);

                    return yPosition - metrics.getHeight() / 2 +

                        metrics.getAscent();

                }

            }

        }

        return 0;

    }

    /**

     * Returns an enum indicating how the baseline of the component

     * changes as the size changes.

     *

     * @throws NullPointerException {@inheritDoc}

     * @see javax.swing.JComponent#getBaseline(int, int)

     * @since 1.6

     */

    public Component.BaselineResizeBehavior getBaselineResizeBehavior(

            JComponent c) {

        super.getBaselineResizeBehavior(c);

        // NOTE: BasicSpinner really provides for CENTER_OFFSET, but

        // the default min/pref size is smaller than it should be

        // so that getBaseline() doesn't implement the contract

        // for CENTER_OFFSET as defined in Component.

        return Component.BaselineResizeBehavior.OTHER;

    }

    /**

     * Returns true if all the labels from the label table have the same

     * baseline.

     *

     * @return true if all the labels from the label table have the

     *         same baseline

     * @since 1.6

     */

    protected boolean labelsHaveSameBaselines() {

        if (!checkedLabelBaselines) {

            checkedLabelBaselines = true;

            Dictionary dictionary = slider.getLabelTable();

            if (dictionary != null) {

                sameLabelBaselines = true;

                Enumeration elements = dictionary.elements();

                int baseline = -1;

                while (elements.hasMoreElements()) {

                    Dimension pref = label.getPreferredSize();

                    int labelBaseline = label.getBaseline(pref.width,

                                                          pref.height);

                    if (labelBaseline >= 0) {

                        if (baseline == -1) {

                            baseline = labelBaseline;

                        }

                        else if (baseline != labelBaseline) {

                            sameLabelBaselines = false;

                            break;

                        }

                    }

                    else {

                        sameLabelBaselines = false;

                        break;

                    }

                }

            }

            else {

                sameLabelBaselines = false;

            }

        }

        return sameLabelBaselines;

    }

    public Dimension getPreferredHorizontalSize() {

        Dimension horizDim = (Dimension)DefaultLookup.get(slider,

                this, "Slider.horizontalSize");

        if (horizDim == null) {

            horizDim = new Dimension(200, 21);

        }

        return horizDim;

    }

    public Dimension getPreferredVerticalSize() {

        Dimension vertDim = (Dimension)DefaultLookup.get(slider,

                this, "Slider.verticalSize");

        if (vertDim == null) {

            vertDim = new Dimension(21, 200);

        }

        return vertDim;

    }

    public Dimension getMinimumHorizontalSize() {

        Dimension minHorizDim = (Dimension)DefaultLookup.get(slider,

                this, "Slider.minimumHorizontalSize");

        if (minHorizDim == null) {

            minHorizDim = new Dimension(36, 21);

        }

        return minHorizDim;

    }

    public Dimension getMinimumVerticalSize() {

        Dimension minVertDim = (Dimension)DefaultLookup.get(slider,

                this, "Slider.minimumVerticalSize");

        if (minVertDim == null) {

            minVertDim = new Dimension(21, 36);

        }

        return minVertDim;

    }

    public Dimension getPreferredSize(JComponent c)    {

        recalculateIfInsetsChanged();

        Dimension d;

        if ( slider.getOrientation() == JSlider.VERTICAL ) {

            d = new Dimension(getPreferredVerticalSize());

            d.width = insetCache.left + insetCache.right;

            d.width += focusInsets.left + focusInsets.right;

            d.width += trackRect.width + tickRect.width + labelRect.width;

        }

        else {

            d = new Dimension(getPreferredHorizontalSize());

            d.height = insetCache.top + insetCache.bottom;

            d.height += focusInsets.top + focusInsets.bottom;

            d.height += trackRect.height + tickRect.height + labelRect.height;

        }

        return d;

    }

    public Dimension getMinimumSize(JComponent c)  {

        recalculateIfInsetsChanged();

        Dimension d;

        if ( slider.getOrientation() == JSlider.VERTICAL ) {

            d = new Dimension(getMinimumVerticalSize());

            d.width = insetCache.left + insetCache.right;

            d.width += focusInsets.left + focusInsets.right;

            d.width += trackRect.width + tickRect.width + labelRect.width;

        }

        else {

            d = new Dimension(getMinimumHorizontalSize());

            d.height = insetCache.top + insetCache.bottom;

            d.height += focusInsets.top + focusInsets.bottom;

            d.height += trackRect.height + tickRect.height + labelRect.height;

        }

        return d;

    }

    public Dimension getMaximumSize(JComponent c) {

        Dimension d = getPreferredSize(c);

        if ( slider.getOrientation() == JSlider.VERTICAL ) {

            d.height = Short.MAX_VALUE;

        }

        else {

            d.width = Short.MAX_VALUE;

        }

        return d;

    }

    protected void calculateGeometry() {

        calculateFocusRect();

        calculateContentRect();

        calculateThumbSize();

        calculateTrackBuffer();

        calculateTrackRect();

        calculateTickRect();

        calculateLabelRect();

        calculateThumbLocation();