css.java

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

	private String name;

	static final Value[] allValues = {
	    INHERITED, NONE, DOTTED, DASHED, SOLID, DOUBLE, GROOVE,
	    RIDGE, INSET, OUTSET, DISC, CIRCLE, SQUARE, DECIMAL,
	    LOWER_ROMAN, UPPER_ROMAN, LOWER_ALPHA, UPPER_ALPHA,
	    BLANK_LIST_ITEM, BACKGROUND_NO_REPEAT, BACKGROUND_REPEAT,
	    BACKGROUND_REPEAT_X, BACKGROUND_REPEAT_Y,
	    BACKGROUND_FIXED, BACKGROUND_FIXED
	};
    }

    public CSS() {
	baseFontSize = baseFontSizeIndex + 1;
	// setup the css conversion table
	valueConvertor = new Hashtable();
	valueConvertor.put(CSS.Attribute.FONT_SIZE, new FontSize());
	valueConvertor.put(CSS.Attribute.FONT_FAMILY, new FontFamily());
	valueConvertor.put(CSS.Attribute.FONT_WEIGHT, new FontWeight());
	valueConvertor.put(CSS.Attribute.BORDER_STYLE, new BorderStyle());
	Object cv = new ColorValue();
	valueConvertor.put(CSS.Attribute.COLOR, cv);
	valueConvertor.put(CSS.Attribute.BACKGROUND_COLOR, cv);
	valueConvertor.put(CSS.Attribute.BORDER_COLOR, cv);
	Object lv = new LengthValue();
	valueConvertor.put(CSS.Attribute.MARGIN_TOP, lv);
	valueConvertor.put(CSS.Attribute.MARGIN_BOTTOM, lv);
	valueConvertor.put(CSS.Attribute.MARGIN_LEFT, lv);
	valueConvertor.put(CSS.Attribute.MARGIN_LEFT_LTR, lv);
	valueConvertor.put(CSS.Attribute.MARGIN_LEFT_RTL, lv);
	valueConvertor.put(CSS.Attribute.MARGIN_RIGHT, lv);
	valueConvertor.put(CSS.Attribute.MARGIN_RIGHT_LTR, lv);
	valueConvertor.put(CSS.Attribute.MARGIN_RIGHT_RTL, lv);
	valueConvertor.put(CSS.Attribute.PADDING_TOP, lv);
	valueConvertor.put(CSS.Attribute.PADDING_BOTTOM, lv);
	valueConvertor.put(CSS.Attribute.PADDING_LEFT, lv);
	valueConvertor.put(CSS.Attribute.PADDING_RIGHT, lv);
	Object bv = new BorderWidthValue(null, 0);
	valueConvertor.put(CSS.Attribute.BORDER_WIDTH, lv);
	valueConvertor.put(CSS.Attribute.BORDER_TOP_WIDTH, bv);
	valueConvertor.put(CSS.Attribute.BORDER_BOTTOM_WIDTH, bv);
	valueConvertor.put(CSS.Attribute.BORDER_LEFT_WIDTH, bv);
	valueConvertor.put(CSS.Attribute.BORDER_RIGHT_WIDTH, bv);
	Object nlv = new LengthValue(true);
	valueConvertor.put(CSS.Attribute.TEXT_INDENT, nlv);
	valueConvertor.put(CSS.Attribute.WIDTH, lv);
	valueConvertor.put(CSS.Attribute.HEIGHT, lv);
	valueConvertor.put(CSS.Attribute.BORDER_SPACING, lv);
	Object sv = new StringValue();
	valueConvertor.put(CSS.Attribute.FONT_STYLE, sv);
	valueConvertor.put(CSS.Attribute.TEXT_DECORATION, sv);
	valueConvertor.put(CSS.Attribute.TEXT_ALIGN, sv);
	valueConvertor.put(CSS.Attribute.VERTICAL_ALIGN, sv);
	Object valueMapper = new CssValueMapper();
	valueConvertor.put(CSS.Attribute.LIST_STYLE_TYPE,
			   valueMapper);
	valueConvertor.put(CSS.Attribute.BACKGROUND_IMAGE,
			   new BackgroundImage());
	valueConvertor.put(CSS.Attribute.BACKGROUND_POSITION,
			   new BackgroundPosition());
	valueConvertor.put(CSS.Attribute.BACKGROUND_REPEAT,
			   valueMapper);
	valueConvertor.put(CSS.Attribute.BACKGROUND_ATTACHMENT,
			   valueMapper);
	Object generic = new CssValue();
	int n = CSS.Attribute.allAttributes.length;
	for (int i = 0; i < n; i++) {
	    CSS.Attribute key = CSS.Attribute.allAttributes[i];
	    if (valueConvertor.get(key) == null) {
		valueConvertor.put(key, generic);
	    }
	}
    }

    /**
     * Sets the base font size. <code>sz</code> is a CSS value, and is
     * not necessarily the point size. Use getPointSize to determine the
     * point size corresponding to <code>sz</code>.
     */
    void setBaseFontSize(int sz) {
	if (sz < 1)
	  baseFontSize = 0;
	else if (sz > 7)
	  baseFontSize = 7;
	else
	  baseFontSize = sz;
    }

    /**
     * Sets the base font size from the passed in string.
     */
    void setBaseFontSize(String size) {
	int relSize, absSize, diff;

	if (size != null) {
	    if (size.startsWith("+")) {
		relSize = Integer.valueOf(size.substring(1)).intValue();
		setBaseFontSize(baseFontSize + relSize);
	    } else if (size.startsWith("-")) {
		relSize = -Integer.valueOf(size.substring(1)).intValue();
		setBaseFontSize(baseFontSize + relSize);
	    } else {
		setBaseFontSize(Integer.valueOf(size).intValue());
	    }
	}
    }

    /**
     * Returns the base font size.
     */
    int getBaseFontSize() {
	return baseFontSize;
    }

    /**
     * Parses the CSS property <code>key</code> with value
     * <code>value</code> placing the result in <code>att</code>.
     */
    void addInternalCSSValue(MutableAttributeSet attr,
			     CSS.Attribute key, String value) {
	if (key == CSS.Attribute.FONT) {
	    ShorthandFontParser.parseShorthandFont(this, value, attr);
	}
	else if (key == CSS.Attribute.BACKGROUND) {
	    ShorthandBackgroundParser.parseShorthandBackground
		               (this, value, attr);
	}
	else if (key == CSS.Attribute.MARGIN) {
	    ShorthandMarginParser.parseShorthandMargin(this, value, attr,
					   CSS.Attribute.ALL_MARGINS);
	}
	else if (key == CSS.Attribute.PADDING) {
	    ShorthandMarginParser.parseShorthandMargin(this, value, attr,
					   CSS.Attribute.ALL_PADDING);
	}
	else if (key == CSS.Attribute.BORDER_WIDTH) {
	    ShorthandMarginParser.parseShorthandMargin(this, value, attr,
					   CSS.Attribute.ALL_BORDER_WIDTHS);
	}
	else {
	    Object iValue = getInternalCSSValue(key, value);
	    if (iValue != null) {
		attr.addAttribute(key, iValue);
	    }
	}
    }

    /**
     * Gets the internal CSS representation of <code>value</code> which is
     * a CSS value of the CSS attribute named <code>key</code>. The receiver
     * should not modify <code>value</code>, and the first <code>count</code>
     * strings are valid.
     */
    Object getInternalCSSValue(CSS.Attribute key, String value) {
	CssValue conv = (CssValue) valueConvertor.get(key);
        Object r = conv.parseCssValue(value);
        return r != null ? r : conv.parseCssValue(key.getDefaultValue());
    }

    /**
     * Maps from a StyleConstants to a CSS Attribute.
     */
    Attribute styleConstantsKeyToCSSKey(StyleConstants sc) {
	return (Attribute)styleConstantToCssMap.get(sc);
    }

    /**
     * Maps from a StyleConstants value to a CSS value.
     */
    Object styleConstantsValueToCSSValue(StyleConstants sc,
					 Object styleValue) {
	Object cssKey = styleConstantsKeyToCSSKey(sc);
	if (cssKey != null) {
	    CssValue conv = (CssValue)valueConvertor.get(cssKey);
	    return conv.fromStyleConstants(sc, styleValue);
	}
	return null;
    }

    /**
     * Converts the passed in CSS value to a StyleConstants value.
     * <code>key</code> identifies the CSS attribute being mapped.
     */
    Object cssValueToStyleConstantsValue(StyleConstants key, Object value) {
	if (value instanceof CssValue) {
	    return ((CssValue)value).toStyleConstants((StyleConstants)key,
						      null);
	}
	return null;
    }

    /**
     * Returns the font for the values in the passed in AttributeSet.
     * It is assumed the keys will be CSS.Attribute keys.
     * <code>sc</code> is the StyleContext that will be messaged to get
     * the font once the size, name and style have been determined.
     */
    Font getFont(StyleContext sc, AttributeSet a, int defaultSize, StyleSheet ss) {
        ss = getStyleSheet(ss);
	int size = getFontSize(a, defaultSize, ss);

	/*
	 * If the vertical alignment is set to either superscirpt or
	 * subscript we reduce the font size by 2 points.
	 */
	StringValue vAlignV = (StringValue)a.getAttribute
	                      (CSS.Attribute.VERTICAL_ALIGN);
	if ((vAlignV != null)) {
	    String vAlign = vAlignV.toString();
	    if ((vAlign.indexOf("sup") >= 0) ||
		(vAlign.indexOf("sub") >= 0)) {
		size -= 2;
	    }
	}
	
	FontFamily familyValue = (FontFamily)a.getAttribute
	                                    (CSS.Attribute.FONT_FAMILY);
	String family = (familyValue != null) ? familyValue.getValue() :
	                          Font.SANS_SERIF;
	int style = Font.PLAIN;
	FontWeight weightValue = (FontWeight) a.getAttribute
	                          (CSS.Attribute.FONT_WEIGHT);
	if ((weightValue != null) && (weightValue.getValue() > 400)) {
	    style |= Font.BOLD;
	}
	Object fs = a.getAttribute(CSS.Attribute.FONT_STYLE);
	if ((fs != null) && (fs.toString().indexOf("italic") >= 0)) {
	    style |= Font.ITALIC;
	}
        if (family.equalsIgnoreCase("monospace")) {
            family = Font.MONOSPACED;
        }
	Font f = sc.getFont(family, style, size);
        if (f == null 
            || (f.getFamily().equals(Font.DIALOG)
                && ! family.equalsIgnoreCase(Font.DIALOG))) {
            family = Font.SANS_SERIF;
            f = sc.getFont(family, style, size);
        }
	return f;
    }

    static int getFontSize(AttributeSet attr, int defaultSize, StyleSheet ss) {
	// PENDING(prinz) this is a 1.1 based implementation, need to also
	// have a 1.2 version.
	FontSize sizeValue = (FontSize)attr.getAttribute(CSS.Attribute.
							 FONT_SIZE);

	return (sizeValue != null) ? sizeValue.getValue(attr, ss)
                                   : defaultSize;
    }

    /**
     * Takes a set of attributes and turn it into a color
     * specification.  This might be used to specify things
     * like brighter, more hue, etc.
     * This will return null if there is no value for <code>key</code>.
     *
     * @param key CSS.Attribute identifying where color is stored.
     * @param a the set of attributes
     * @return the color
     */
    Color getColor(AttributeSet a, CSS.Attribute key) {
	ColorValue cv = (ColorValue) a.getAttribute(key);
	if (cv != null) {
	    return cv.getValue();
	}
	return null;
    }

    /**
     * Returns the size of a font from the passed in string.
     *
     * @param size CSS string describing font size
     * @param baseFontSize size to use for relative units.
     */
    float getPointSize(String size, StyleSheet ss) {
	int relSize, absSize, diff, index;
        ss = getStyleSheet(ss);
	if (size != null) {
	    if (size.startsWith("+")) {
		relSize = Integer.valueOf(size.substring(1)).intValue();
		return getPointSize(baseFontSize + relSize, ss);
	    } else if (size.startsWith("-")) {
		relSize = -Integer.valueOf(size.substring(1)).intValue();
		return getPointSize(baseFontSize + relSize, ss);
	    } else {
		absSize = Integer.valueOf(size).intValue();
		return getPointSize(absSize, ss);
	    }
	}
	return 0;
    }

    /**
     * Returns the length of the attribute in <code>a</code> with
     * key <code>key</code>.
     */
    float getLength(AttributeSet a, CSS.Attribute key, StyleSheet ss) {
        ss = getStyleSheet(ss);
	LengthValue lv = (LengthValue) a.getAttribute(key);
        boolean isW3CLengthUnits = (ss == null) ? false : ss.isW3CLengthUnits();
        float len = (lv != null) ? lv.getValue(isW3CLengthUnits) : 0;
	return len;
    }

    /**
     * Convert a set of HTML attributes to an equivalent
     * set of CSS attributes.
     *
     * @param AttributeSet containing the HTML attributes.
     * @return AttributeSet containing the corresponding CSS attributes.
     *        The AttributeSet will be empty if there are no mapping
     *        CSS attributes.
     */
    AttributeSet translateHTMLToCSS(AttributeSet htmlAttrSet) {
	MutableAttributeSet cssAttrSet = new SimpleAttributeSet();
	Element elem = (Element)htmlAttrSet;
	HTML.Tag tag = getHTMLTag(htmlAttrSet);
	if ((tag == HTML.Tag.TD) || (tag == HTML.Tag.TH)) {
	    // translate border width into the cells
	    AttributeSet tableAttr = elem.getParentElement().
		                     getParentElement().getAttributes();
	    translateAttribute(HTML.Attribute.BORDER, tableAttr, cssAttrSet);
	    String pad = (String)tableAttr.getAttribute(HTML.Attribute.CELLPADDING);
	    if (pad != null) {
		LengthValue v = 
		    (LengthValue)getInternalCSSValue(CSS.Attribute.PADDING_TOP, pad);
		v.span = (v.span < 0) ? 0 : v.span;
		cssAttrSet.addAttribute(CSS.Attribute.PADDING_TOP, v);
		cssAttrSet.addAttribute(CSS.Attribute.PADDING_BOTTOM, v);
		cssAttrSet.addAttribute(CSS.Attribute.PADDING_LEFT, v);
		cssAttrSet.addAttribute(CSS.Attribute.PADDING_RIGHT, v);
	    }
	}
	if (elem.isLeaf()) {
	    translateEmbeddedAttributes(htmlAttrSet, cssAttrSet);
	} else {
	    translateAttributes(tag, htmlAttrSet, cssAttrSet);
	}
	if (tag == HTML.Tag.CAPTION) {
	    /* 
	     * Navigator uses ALIGN for caption placement and IE uses VALIGN.
	     */
	    Object v = htmlAttrSet.getAttribute(HTML.Attribute.ALIGN);
	    if ((v != null) && (v.equals("top") || v.equals("bottom"))) {
		cssAttrSet.addAttribute(CSS.Attribute.CAPTION_SIDE, v);
		cssAttrSet.removeAttribute(CSS.Attribute.TEXT_ALIGN);
	    } else {
		v = htmlAttrSet.getAttribute(HTML.Attribute.VALIGN);
		if (v != null) {
		    cssAttrSet.addAttribute(CSS.Attribute.CAPTION_SIDE, v);
		}
	    }
	}
	return cssAttrSet;
    }

    private static final Hashtable attributeMap = new Hashtable();
    private static final Hashtable valueMap = new Hashtable();

    /**
     * The hashtable and the static initalization block below,
     * set up a mapping from well-known HTML attributes to
     * CSS attributes.  For the most part, there is a 1-1 mapping
     * between the two.  However in the case of certain HTML
     * attributes for example HTML.Attribute.VSPACE or
     * HTML.Attribute.HSPACE, end up mapping to two CSS.Attribute's.
     * Therefore, the value associated with each HTML.Attribute.
     * key ends up being an array of CSS.Attribute.* objects.
     */
    private static final Hashtable htmlAttrToCssAttrMap = new Hashtable(20);

    /**
     * The hashtable and static initialization that follows sets
     * up a translation from StyleConstants (i.e. the <em>well known</em>
     * attributes) to the associated CSS attributes.
     */
    private static final Hashtable styleConstantToCssMap = new Hashtable(17);
    /** Maps from HTML value to a CSS value. Used in internal mapping. */
    private static final Hashtable htmlValueToCssValueMap = new Hashtable(8);
    /** Maps from CSS value (string) to internal value. */
    private static final Hashtable cssValueToInternalValueMap = new Hashtable(13);

    static {
	// load the attribute map
	for (int i = 0; i < Attribute.allAttributes.length; i++ ) {
	    attributeMap.put(Attribute.allAttributes[i].toString(),
			     Attribute.allAttributes[i]);
	}
	// load the value map
	for (int i = 0; i < Value.allValues.length; i++ ) {
	    valueMap.put(Value.allValues[i].toString(), 
			     Value.allValues[i]);
	}

	htmlAttrToCssAttrMap.put(HTML.Attribute.COLOR,
				 new CSS.Attribute[]{CSS.Attribute.COLOR});
	htmlAttrToCssAttrMap.put(HTML.Attribute.TEXT,
				 new CSS.Attribute[]{CSS.Attribute.COLOR});
	htmlAttrToCssAttrMap.put(HTML.Attribute.CLEAR,
				 new CSS.Attribute[]{CSS.Attribute.CLEAR});