/*

 * Copyright 2002-2006 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.synth;

import java.awt.*;

import java.awt.event.*;

import java.io.Serializable;

import javax.swing.*;

import javax.swing.border.*;

import java.awt.*;

import java.awt.event.*;

import java.beans.*;

import javax.swing.plaf.*;

import javax.swing.plaf.basic.BasicButtonUI;

import javax.swing.plaf.basic.BasicHTML;

import javax.swing.text.View;

import sun.swing.plaf.synth.SynthUI;

import sun.swing.plaf.synth.DefaultSynthStyle;

/**

 * Synth's ButtonUI implementation.

 *

 * @author Scott Violet

 */

class SynthButtonUI extends BasicButtonUI implements

                                 PropertyChangeListener, SynthUI {

    private SynthStyle style;

    public static ComponentUI createUI(JComponent c) {

        return new SynthButtonUI();

    }

    protected void installDefaults(AbstractButton b) {

        updateStyle(b);

        LookAndFeel.installProperty(b, "rolloverEnabled", Boolean.TRUE);

    }

    protected void installListeners(AbstractButton b) {

        super.installListeners(b);

        b.addPropertyChangeListener(this);

    }

    void updateStyle(AbstractButton b) {

        SynthContext context = getContext(b, SynthConstants.ENABLED);

        SynthStyle oldStyle = style;

        style = SynthLookAndFeel.updateStyle(context, this);

        if (style != oldStyle) {

            if (b.getMargin() == null ||

                                (b.getMargin() instanceof UIResource)) {

                Insets margin = (Insets)style.get(context,getPropertyPrefix() +

                                                  "margin");

                if (margin == null) {

                    // Some places assume margins are non-null.

                    margin = SynthLookAndFeel.EMPTY_UIRESOURCE_INSETS;

                }

                b.setMargin(margin);

            }

            Object value = style.get(context, getPropertyPrefix() + "iconTextGap");

            if (value != null) {

                        LookAndFeel.installProperty(b, "iconTextGap", value);

            }

            value = style.get(context, getPropertyPrefix() + "contentAreaFilled");

            LookAndFeel.installProperty(b, "contentAreaFilled",

                                        value != null? value : Boolean.TRUE);

            if (oldStyle != null) {

                uninstallKeyboardActions(b);

                installKeyboardActions(b);

            }

        }

        context.dispose();

    }

    protected void uninstallListeners(AbstractButton b) {

        super.uninstallListeners(b);

        b.removePropertyChangeListener(this);

    }

    protected void uninstallDefaults(AbstractButton b) {

        SynthContext context = getContext(b, ENABLED);

        style.uninstallDefaults(context);

        context.dispose();

        style = null;

    }

    public SynthContext getContext(JComponent c) {

        return getContext(c, getComponentState(c));

    }

    SynthContext getContext(JComponent c, int state) {

        Region region = getRegion(c);

        return SynthContext.getContext(SynthContext.class, c, region,

                                       style, state);

    }

    private Region getRegion(JComponent c) {

        return SynthLookAndFeel.getRegion(c);

    }

    /**

     * Returns the current state of the passed in <code>AbstractButton</code>.

     */

    private int getComponentState(JComponent c) {

        int state = ENABLED;

        if (!c.isEnabled()) {

            state = DISABLED;

        }

        if (SynthLookAndFeel.selectedUI == this) {

            return SynthLookAndFeel.selectedUIState | SynthConstants.ENABLED;

        }

        AbstractButton button = (AbstractButton) c;

        ButtonModel model = button.getModel();

        if (model.isPressed()) {

            if (model.isArmed()) {

                state = PRESSED;

            }

            else {

                state = MOUSE_OVER;

            }

        }

        if (model.isRollover()) {

            state |= MOUSE_OVER;

        }

        if (model.isSelected()) {

            state |= SELECTED;

        }

        if (c.isFocusOwner() && button.isFocusPainted()) {

            state |= FOCUSED;

        }

        if ((c instanceof JButton) && ((JButton)c).isDefaultButton()) {

            state |= DEFAULT;

        }

        return state;

    }

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

        if (c == null) {

            throw new NullPointerException("Component must be non-null");

        }

        if (width < 0 || height < 0) {

            throw new IllegalArgumentException(

                    "Width and height must be >= 0");

        }

        AbstractButton b = (AbstractButton)c;

        String text = b.getText();

        if (text == null || "".equals(text)) {

            return -1;

        }

        Insets i = b.getInsets();

        Rectangle viewRect = new Rectangle();

        Rectangle textRect = new Rectangle();

        Rectangle iconRect = new Rectangle();

        viewRect.x = i.left;

        viewRect.y = i.top;

        viewRect.width = width - (i.right + viewRect.x);

        viewRect.height = height - (i.bottom + viewRect.y);

        // layout the text and icon

        SynthContext context = getContext(b);

        FontMetrics fm = context.getComponent().getFontMetrics(

            context.getStyle().getFont(context));

        context.getStyle().getGraphicsUtils(context).layoutText(

            context, fm, b.getText(), b.getIcon(),

            b.getHorizontalAlignment(), b.getVerticalAlignment(),

            b.getHorizontalTextPosition(), b.getVerticalTextPosition(),

            viewRect, iconRect, textRect, b.getIconTextGap());

        View view = (View)b.getClientProperty(BasicHTML.propertyKey);

        int baseline;

        if (view != null) {

            baseline = BasicHTML.getHTMLBaseline(view, textRect.width,

                                                 textRect.height);

            if (baseline >= 0) {

                baseline += textRect.y;

            }

        }

        else {

            baseline = textRect.y + fm.getAscent();

        }

        context.dispose();

        return baseline;

    }

    // ********************************

    //          Paint Methods

    // ********************************

    public void update(Graphics g, JComponent c) {

        SynthContext context = getContext(c);

        SynthLookAndFeel.update(context, g);

        paintBackground(context, g, c);

        paint(context, g);

        context.dispose();

    }

    public void paint(Graphics g, JComponent c) {

        SynthContext context = getContext(c);

        paint(context, g);

        context.dispose();

    }

    protected void paint(SynthContext context, Graphics g) {

        AbstractButton b = (AbstractButton)context.getComponent();

        g.setColor(context.getStyle().getColor(context,

                                               ColorType.TEXT_FOREGROUND));

        g.setFont(style.getFont(context));

        context.getStyle().getGraphicsUtils(context).paintText(

            context, g, b.getText(), getIcon(b),

            b.getHorizontalAlignment(), b.getVerticalAlignment(),

            b.getHorizontalTextPosition(), b.getVerticalTextPosition(),

            b.getIconTextGap(), b.getDisplayedMnemonicIndex(),

            getTextShiftOffset(context));

    }

    void paintBackground(SynthContext context, Graphics g, JComponent c) {

        if (((AbstractButton) c).isContentAreaFilled()) {

            context.getPainter().paintButtonBackground(context, g, 0, 0,

                                                       c.getWidth(),

                                                       c.getHeight());

        }

    }

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

                            int y, int w, int h) {

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

    }

    /**

     * Returns the default icon. This should NOT callback

     * to the JComponent.

     *

     * @param b AbstractButton the iocn is associated with

     * @return default icon

     */

    protected Icon getDefaultIcon(AbstractButton b) {

        SynthContext context = getContext(b);

        Icon icon = context.getStyle().getIcon(context, getPropertyPrefix() + "icon");

        context.dispose();

        return icon;

    }

    /**

     * Returns the Icon to use in painting the button.

     */

    protected Icon getIcon(AbstractButton b) {

        Icon icon = b.getIcon();

        ButtonModel model = b.getModel();

        if (!model.isEnabled()) {

            icon = getSynthDisabledIcon(b, icon);

        } else if (model.isPressed() && model.isArmed()) {

            icon = getPressedIcon(b, getSelectedIcon(b, icon));

        } else if (b.isRolloverEnabled() && model.isRollover()) {

            icon = getRolloverIcon(b, getSelectedIcon(b, icon));

        } else if (model.isSelected()) {

            icon = getSelectedIcon(b, icon);

        } else {

            icon = getEnabledIcon(b, icon);

        }

        if(icon == null) {

            return getDefaultIcon(b);

        }

        return icon;

    }

    /**

     * This method will return the icon that should be used for a button.  We

     * only want to use the synth icon defined by the style if the specific

     * icon has not been defined for the button state and the backup icon is a

     * UIResource (we set it, not the developer).

     *

     * @param b button

     * @param specificIcon icon returned from the button for the specific state

     * @param defaultIcon fallback icon

     * @param state the synth state of the button

     */

    private Icon getIcon(AbstractButton b, Icon specificIcon, Icon defaultIcon,

            int state) {

        Icon icon = specificIcon;

        if (icon == null) {

            if (defaultIcon instanceof UIResource) {

                icon = getSynthIcon(b, state);

                if (icon == null) {

                    icon = defaultIcon;

                }

            } else {

                icon = defaultIcon;

            }

        }

        return icon;

    }

    private Icon getSynthIcon(AbstractButton b, int synthConstant) {

        return style.getIcon(getContext(b, synthConstant), getPropertyPrefix() + "icon");

    }

    private Icon getEnabledIcon(AbstractButton b, Icon defaultIcon) {

        if (defaultIcon == null) {

            defaultIcon = getSynthIcon(b, SynthConstants.ENABLED);

        }

        return defaultIcon;

    }

    private Icon getSelectedIcon(AbstractButton b, Icon defaultIcon) {

        return getIcon(b, b.getSelectedIcon(), defaultIcon,

                SynthConstants.SELECTED);

    }

    private Icon getRolloverIcon(AbstractButton b, Icon defaultIcon) {

        ButtonModel model = b.getModel();

        Icon icon;

        if (model.isSelected()) {

            icon = getIcon(b, b.getRolloverSelectedIcon(), defaultIcon,

                    SynthConstants.MOUSE_OVER | SynthConstants.SELECTED);

        } else {

            icon = getIcon(b, b.getRolloverIcon(), defaultIcon,

                    SynthConstants.MOUSE_OVER);

        }

        return icon;

    }

    private Icon getPressedIcon(AbstractButton b, Icon defaultIcon) {

        return getIcon(b, b.getPressedIcon(), defaultIcon,

                SynthConstants.PRESSED);

    }

    private Icon getSynthDisabledIcon(AbstractButton b, Icon defaultIcon) {

        ButtonModel model = b.getModel();

        Icon icon;

        if (model.isSelected()) {

            icon = getIcon(b, b.getDisabledSelectedIcon(), defaultIcon,

                    SynthConstants.DISABLED | SynthConstants.SELECTED);

        } else {

            icon = getIcon(b, b.getDisabledIcon(), defaultIcon,

                    SynthConstants.DISABLED);

        }

        return icon;

    }

    /**

     * Returns the amount to shift the text/icon when painting.

     */

    protected int getTextShiftOffset(SynthContext state) {

        AbstractButton button = (AbstractButton)state.getComponent();

        ButtonModel model = button.getModel();

        if (model.isArmed() && model.isPressed() &&

                               button.getPressedIcon() == null) {

            return state.getStyle().getInt(state, getPropertyPrefix() +

                                           "textShiftOffset", 0);

        }

        return 0;

    }

    // ********************************

    //          Layout Methods

    // ********************************

    public Dimension getMinimumSize(JComponent c) {

        if (c.getComponentCount() > 0 && c.getLayout() != null) {

            return null;

        }

        AbstractButton b = (AbstractButton)c;

        SynthContext ss = getContext(c);

        Dimension size = ss.getStyle().getGraphicsUtils(ss).getMinimumSize(

               ss, ss.getStyle().getFont(ss), b.getText(), getSizingIcon(b),

               b.getHorizontalAlignment(), b.getVerticalAlignment(),

               b.getHorizontalTextPosition(),

               b.getVerticalTextPosition(), b.getIconTextGap(),

               b.getDisplayedMnemonicIndex());

        ss.dispose();

        return size;

    }

    public Dimension getPreferredSize(JComponent c) {

        if (c.getComponentCount() > 0 && c.getLayout() != null) {

            return null;

        }

        AbstractButton b = (AbstractButton)c;

        SynthContext ss = getContext(c);

        Dimension size = ss.getStyle().getGraphicsUtils(ss).getPreferredSize(

               ss, ss.getStyle().getFont(ss), b.getText(), getSizingIcon(b),

               b.getHorizontalAlignment(), b.getVerticalAlignment(),

               b.getHorizontalTextPosition(),

               b.getVerticalTextPosition(), b.getIconTextGap(),

               b.getDisplayedMnemonicIndex());

        ss.dispose();

        return size;

    }

    public Dimension getMaximumSize(JComponent c) {

        if (c.getComponentCount() > 0 && c.getLayout() != null) {

            return null;

        }

        AbstractButton b = (AbstractButton)c;

        SynthContext ss = getContext(c);

        Dimension size = ss.getStyle().getGraphicsUtils(ss).getMaximumSize(

               ss, ss.getStyle().getFont(ss), b.getText(), getSizingIcon(b),

               b.getHorizontalAlignment(), b.getVerticalAlignment(),

               b.getHorizontalTextPosition(),

               b.getVerticalTextPosition(), b.getIconTextGap(),

               b.getDisplayedMnemonicIndex());

        ss.dispose();

        return size;

    }

    /**

     * Returns the Icon used in calculating the pref/min/max size.

     */

    protected Icon getSizingIcon(AbstractButton b) {

        // NOTE: this is slightly different than BasicButtonUI, where it

        // would just use getIcon, but this should be ok.

        Icon icon = (b.isEnabled()) ? b.getIcon() : b.getDisabledIcon();

        if (icon == null) {

            icon = getDefaultIcon(b);

        }

        return icon;

    }

    public void propertyChange(PropertyChangeEvent e) {

        if (SynthLookAndFeel.shouldUpdateStyle(e)) {

            updateStyle((AbstractButton)e.getSource());

        }

    }

}