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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * This code is free software; you can redistribute it and/or modify it
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 * particular file as subject to the "Classpath" exception as provided
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 *
 * 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).
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package javax.swing.plaf.synth;

import javax.swing.*;
import java.awt.*;
import java.beans.*;
import javax.swing.plaf.*;
import javax.swing.plaf.basic.BasicButtonUI;
import javax.swing.plaf.basic.BasicHTML;
import javax.swing.text.View;


Provides the Synth L&F UI delegate for JButton. 
Author:Scott Violet
Since:1.7
/**
 * Provides the Synth L&F UI delegate for
 * {@link javax.swing.JButton}.
 *
 * @author Scott Violet
 * @since 1.7
 */
public class SynthButtonUI extends BasicButtonUI implements
                                 PropertyChangeListener, SynthUI {
    private SynthStyle style;

    
Creates a new UI object for the given component.

Params:
  • c – component to create UI object for
Returns:the UI object
/**
     * Creates a new UI object for the given component.
     *
     * @param c component to create UI object for
     * @return the UI object
     */
    public static ComponentUI createUI(JComponent c) {
        return new SynthButtonUI();
    }

    
{@inheritDoc}

/**
     * {@inheritDoc}
     */
    @Override
    protected void installDefaults(AbstractButton b) {
        updateStyle(b);

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

    
{@inheritDoc}

/**
     * {@inheritDoc}
     */
    @Override
    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);
            }

        }
    }

    
{@inheritDoc}

/**
     * {@inheritDoc}
     */
    @Override
    protected void uninstallListeners(AbstractButton b) {
        super.uninstallListeners(b);
        b.removePropertyChangeListener(this);
    }

    
{@inheritDoc}

/**
     * {@inheritDoc}
     */
    @Override
    protected void uninstallDefaults(AbstractButton b) {
        SynthContext context = getContext(b, ENABLED);

        style.uninstallDefaults(context);
        style = null;
    }

    
{@inheritDoc}

/**
     * {@inheritDoc}
     */
    @Override
    public SynthContext getContext(JComponent c) {
        return getContext(c, getComponentState(c));
    }

    SynthContext getContext(JComponent c, int state) {
        return SynthContext.getContext(c, style, state);
    }

    
Returns the current state of the passed in AbstractButton.

/**
     * 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.getSelectedUI() == this) {
            return SynthLookAndFeel.getSelectedUIState() | 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;
    }

    
{@inheritDoc}

/**
     * {@inheritDoc}
     */
    @Override
    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();
        }
        return baseline;
    }

    // ********************************
    //          Paint Methods
    // ********************************

    
Notifies this UI delegate to repaint the specified component. This method paints the component background, then calls the paint(SynthContext, Graphics) method. 
In general, this method does not need to be overridden by subclasses. All Look and Feel rendering code should reside in the paint method. 
Params:
  • g – the Graphics object used for painting
  • c – the component being painted
See Also:
/**
     * 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);
        paintBackground(context, g, c);
        paint(context, g);
    }

    
Paints the specified component according to the Look and Feel.

This method is not used by Synth Look and Feel. Painting is handled by the paint(SynthContext, Graphics) method. 
Params:
  • g – the Graphics object used for painting
  • c – the component being painted
See Also:
/**
     * Paints the specified component according to the Look and Feel.
     * <p>This method is not used by Synth Look and Feel.
     * Painting is handled by the {@link #paint(SynthContext,Graphics)} method.
     *
     * @param g the {@code Graphics} object used for painting
     * @param c the component being painted
     * @see #paint(SynthContext,Graphics)
     */
    @Override
    public void paint(Graphics g, JComponent c) {
        SynthContext context = getContext(c);

        paint(context, g);
    }

    
Paints the specified component.

Params:
  • context – context for the component being painted
  • g – the Graphics object used for painting
See Also:
/**
     * 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) {
        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());
        }
    }

    
{@inheritDoc}

/**
     * {@inheritDoc}
     */
    @Override
    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.

Params:
  • b – button the icon is associated with
Returns:default icon
/**
     * Returns the default icon. This should not callback
     * to the JComponent.
     *
     * @param b button the icon is associated with
     * @return default icon
     */
    protected Icon getDefaultIcon(AbstractButton b) {
        SynthContext context = getContext(b);
        Icon icon = context.getStyle().getIcon(context, getPropertyPrefix() + "icon");
        return icon;
    }

    
Returns the Icon to use for painting the button. The icon is chosen with
respect to the current state of the button.

Params:
  • b – button the icon is associated with
Returns:an icon
/**
     * Returns the Icon to use for painting the button. The icon is chosen with
     * respect to the current state of the button.
     *
     * @param b button the icon is associated with
     * @return an icon
     */
    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) or null. 
Params:
  • b – button
  • specificIcon – icon returned from the button for the specific state
  • defaultIcon – fallback icon
  • state – the synth state of the button
/**
     * 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) or {@code null}.
     *
     * @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 == null || 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) {
        return getSpecificIcon(b, b.getRolloverSelectedIcon(), b.getRolloverIcon(),
                               defaultIcon, SynthConstants.MOUSE_OVER);
    }

    private Icon getPressedIcon(AbstractButton b, Icon defaultIcon) {
        return getIcon(b, b.getPressedIcon(), defaultIcon,
                SynthConstants.PRESSED);
    }

    private Icon getSynthDisabledIcon(AbstractButton b, Icon defaultIcon) {
        return getSpecificIcon(b, b.getDisabledSelectedIcon(), b.getDisabledIcon(),
                               defaultIcon, SynthConstants.DISABLED);
    }

    private Icon getSpecificIcon(AbstractButton b, Icon specificSelectedIcon,
                                 Icon specificIcon, Icon defaultIcon,
                                 int state) {
        boolean selected = b.getModel().isSelected();
        Icon icon = null;

        if (selected) {
            icon = specificSelectedIcon;
            if (icon == null) {
                icon = b.getSelectedIcon();
            }
        }

        if (icon == null) {
            icon = specificIcon;
        }

        if (icon != null) {
            return icon;
        }

        if (defaultIcon == null || defaultIcon instanceof UIResource) {
            if (selected) {
                icon = getSynthIcon(b, state | SynthConstants.SELECTED);
                if (icon == null) {
                    icon = getSynthIcon(b, SynthConstants.SELECTED);
                }
            }
            if (icon == null) {
                icon = getSynthIcon(b, state);
            }
        }

        return icon != null ? icon : defaultIcon;
    }

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

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

    
{@inheritDoc}

/**
     * {@inheritDoc}
     */
    @Override
    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());

        return size;
    }

    
{@inheritDoc}

/**
     * {@inheritDoc}
     */
    @Override
    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());

        return size;
    }

    
{@inheritDoc}

/**
     * {@inheritDoc}
     */
    @Override
    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());

        return size;
    }

    
Returns the Icon used in calculating the
preferred/minimum/maximum size.

Params:
  • b – specifies the AbstractButton used when calculating the preferred/minimum/maximum size.
Returns:the Icon used in calculating the
preferred/minimum/maximum size.
/**
     * Returns the Icon used in calculating the
     * preferred/minimum/maximum size.
     *
     * @param b specifies the {@code AbstractButton}
     * used when calculating the preferred/minimum/maximum
     * size.
     *
     * @return the Icon used in calculating the
     * preferred/minimum/maximum size.
     */
    protected Icon getSizingIcon(AbstractButton b) {
        Icon icon = getEnabledIcon(b, b.getIcon());
        if (icon == null) {
            icon = getDefaultIcon(b);
        }
        return icon;
    }

    
{@inheritDoc}

/**
     * {@inheritDoc}
     */
    @Override
    public void propertyChange(PropertyChangeEvent e) {
        if (SynthLookAndFeel.shouldUpdateStyle(e)) {
            updateStyle((AbstractButton)e.getSource());
        }
    }
}