synthgraphicsutils.java

Mobile 应用程序使用 Java Micro Edition (Java ME) 平台

        FontMetrics fm = context.getComponent().getFontMetrics(
            context.getStyle().getFont(context));
        return (fm.getAscent() + fm.getDescent());
    }

    /**
     * Returns the preferred size needed to properly render an icon and text.
     *
     * @param ss SynthContext
     * @param font Font to use
     * @param text Text to layout
     * @param icon Icon to layout
     * @param hAlign horizontal alignment
     * @param vAlign vertical alignment
     * @param hTextPosition horizontal text position
     * @param vTextPosition vertical text position
     * @param iconTextGap gap between icon and text
     * @param mnemonicIndex Index into text to render the mnemonic at, -1
     *        indicates no mnemonic.
     */
    public Dimension getPreferredSize(SynthContext ss, Font font, String text,
                      Icon icon, int hAlign, int vAlign, int hTextPosition,
                      int vTextPosition, int iconTextGap, int mnemonicIndex) {
        JComponent c = ss.getComponent();
        Insets insets = c.getInsets(viewSizingInsets);
        int dx = insets.left + insets.right;
        int dy = insets.top + insets.bottom;

        if (icon == null && (text == null || font == null)) {
            return new Dimension(dx, dy);
        }
        else if ((text == null) || ((icon != null) && (font == null))) {
            return new Dimension(SynthIcon.getIconWidth(icon, ss) + dx, 
                                 SynthIcon.getIconHeight(icon, ss) + dy);
        }
        else {
            FontMetrics fm = c.getFontMetrics(font);

            iconR.x = iconR.y = iconR.width = iconR.height = 0;
            textR.x = textR.y = textR.width = textR.height = 0;
            viewR.x = dx;
            viewR.y = dy;
            viewR.width = viewR.height = Short.MAX_VALUE;

            layoutText(ss, fm, text, icon, hAlign, vAlign,
                   hTextPosition, vTextPosition, viewR, iconR, textR,
                   iconTextGap);
            int x1 = Math.min(iconR.x, textR.x);
            int x2 = Math.max(iconR.x + iconR.width, textR.x + textR.width);
            int y1 = Math.min(iconR.y, textR.y);
            int y2 = Math.max(iconR.y + iconR.height, textR.y + textR.height);
            Dimension rv = new Dimension(x2 - x1, y2 - y1);

            rv.width += dx;
            rv.height += dy;
            return rv;
        }
    }

    /**
     * Paints text at the specified location. This will not attempt to
     * render the text as html nor will it offset by the insets of the
     * component.
     *
     * @param ss SynthContext
     * @param g Graphics used to render string in.
     * @param text Text to render
     * @param bounds Bounds of the text to be drawn.
     * @param mnemonicIndex Index to draw string at.
     */
    public void paintText(SynthContext ss, Graphics g, String text,
                          Rectangle bounds, int mnemonicIndex) {
        paintText(ss, g, text, bounds.x, bounds.y, mnemonicIndex);
    }

    /**
     * Paints text at the specified location. This will not attempt to
     * render the text as html nor will it offset by the insets of the
     * component.
     *
     * @param ss SynthContext
     * @param g Graphics used to render string in.
     * @param text Text to render
     * @param x X location to draw text at.
     * @param y Upper left corner to draw text at.
     * @param mnemonicIndex Index to draw string at.
     */
    public void paintText(SynthContext ss, Graphics g, String text,
                          int x, int y, int mnemonicIndex) {
        if (text != null) {
            JComponent c = ss.getComponent();
            SynthStyle style = ss.getStyle();
            FontMetrics fm = SwingUtilities2.getFontMetrics(c, g);

            y += fm.getAscent();
            SwingUtilities2.drawString(c, g, text, x, y);
            if (mnemonicIndex >= 0 && mnemonicIndex < text.length()) {
                int underlineX = x + SwingUtilities2.stringWidth(
                             c, fm, text.substring(0, mnemonicIndex));
                int underlineY = y;
                int underlineWidth = fm.charWidth(text.charAt(mnemonicIndex));
                int underlineHeight = 1;

                g.fillRect(underlineX, underlineY + fm.getDescent() - 1,
                           underlineWidth, underlineHeight);
            }
        }
    }

    /**
     * Paints an icon and text. This will render the text as html, if
     * necessary, and offset the location by the insets of the component.
     *
     * @param ss SynthContext
     * @param g Graphics to render string and icon into
     * @param text Text to layout
     * @param icon Icon to layout
     * @param hAlign horizontal alignment
     * @param vAlign vertical alignment
     * @param hTextPosition horizontal text position
     * @param vTextPosition vertical text position
     * @param iconTextGap gap between icon and text
     * @param mnemonicIndex Index into text to render the mnemonic at, -1
     *        indicates no mnemonic.
     * @param textOffset Amount to offset the text when painting
     */
    public void paintText(SynthContext ss, Graphics g, String text,
                      Icon icon, int hAlign, int vAlign, int hTextPosition,
                      int vTextPosition, int iconTextGap, int mnemonicIndex,
                      int textOffset) {
        if ((icon == null) && (text == null)) {
            return;
        }
        JComponent c = ss.getComponent();
        FontMetrics fm = SwingUtilities2.getFontMetrics(c, g);
        Insets insets = SynthLookAndFeel.getPaintingInsets(ss, paintInsets);

        paintViewR.x = insets.left;
        paintViewR.y = insets.top;
        paintViewR.width = c.getWidth() - (insets.left + insets.right);
        paintViewR.height = c.getHeight() - (insets.top + insets.bottom);

        paintIconR.x = paintIconR.y = paintIconR.width = paintIconR.height = 0;
        paintTextR.x = paintTextR.y = paintTextR.width = paintTextR.height = 0;

        String clippedText = 
            layoutText(ss, fm, text, icon, hAlign, vAlign,
                   hTextPosition, vTextPosition, paintViewR, paintIconR,
                   paintTextR, iconTextGap);

        if (icon != null) {
            Color color = g.getColor();
            paintIconR.x += textOffset;
            paintIconR.y += textOffset;
            SynthIcon.paintIcon(icon, ss, g, paintIconR.x, paintIconR.y,
                                paintIconR.width, paintIconR.height);
            g.setColor(color);
        }

        if (text != null) {
	    View v = (View) c.getClientProperty(BasicHTML.propertyKey);

	    if (v != null) {
		v.paint(g, paintTextR);
	    } else {
                paintTextR.x += textOffset;
                paintTextR.y += textOffset;

                paintText(ss, g, clippedText, paintTextR, mnemonicIndex);
	    }
        }
    }


    /**
     * Wraps a SynthIcon around the Icon interface, forwarding calls to
     * the SynthIcon with a given SynthContext.
     */
    private static class SynthIconWrapper implements Icon {
        private static final java.util.List CACHE = new java.util.ArrayList(1);

        private SynthIcon synthIcon;
        private SynthContext context;

        static SynthIconWrapper get(SynthIcon icon, SynthContext context) {
            synchronized(CACHE) {
                int size = CACHE.size();
                if (size > 0) {
                    SynthIconWrapper wrapper = (SynthIconWrapper)CACHE.remove(
                                               size - 1);
                    wrapper.reset(icon, context);
                    return wrapper;
                }
            }
            return new SynthIconWrapper(icon, context);
        }

        static void release(SynthIconWrapper wrapper) {
            wrapper.reset(null, null);
            synchronized(CACHE) {
                CACHE.add(wrapper);
            }
        }

        SynthIconWrapper(SynthIcon icon, SynthContext context) {
            reset(icon, context);
        }

        void reset(SynthIcon icon, SynthContext context) {
            synthIcon = icon;
            this.context = context;
        }

        public void paintIcon(Component c, Graphics g, int x, int y) {
            // This is a noop as this should only be for sizing calls.
        }

        public int getIconWidth() {
            return synthIcon.getIconWidth(context);
        }

        public int getIconHeight() {
            return synthIcon.getIconHeight(context);
        }
    }
}