(4);
current = 0;
while (current < length) {
// Skip ws
while (current < length && Character.isWhitespace
(value.charAt(current))) {
current++;
}
last = current;
int inParentheses = 0;
char ch;
while (current < length && (
!Character.isWhitespace(ch = value.charAt(current))
|| inParentheses > 0)) {
if (ch == '(') {
inParentheses++;
} else if (ch == ')') {
inParentheses--;
}
current++;
}
if (last != current) {
temp.addElement(value.substring(last, current));
}
current++;
}
String[] retValue = new String[temp.size()];
temp.copyInto(retValue);
return retValue;
}
/**
* Return the point size, given a size index. Legal HTML index sizes
* are 1-7.
*/
float getPointSize(int index, StyleSheet ss) {
ss = getStyleSheet(ss);
int[] sizeMap = (ss != null) ? ss.getSizeMap() :
StyleSheet.sizeMapDefault;
--index;
if (index < 0)
return sizeMap[0];
else if (index > sizeMap.length - 1)
return sizeMap[sizeMap.length - 1];
else
return sizeMap[index];
}
private void translateEmbeddedAttributes(AttributeSet htmlAttrSet,
MutableAttributeSet cssAttrSet) {
Enumeration keys = htmlAttrSet.getAttributeNames();
if (htmlAttrSet.getAttribute(StyleConstants.NameAttribute) ==
HTML.Tag.HR) {
// HR needs special handling due to us treating it as a leaf.
translateAttributes(HTML.Tag.HR, htmlAttrSet, cssAttrSet);
}
while (keys.hasMoreElements()) {
Object key = keys.nextElement();
if (key instanceof HTML.Tag) {
HTML.Tag tag = (HTML.Tag)key;
Object o = htmlAttrSet.getAttribute(tag);
if (o != null && o instanceof AttributeSet) {
translateAttributes(tag, (AttributeSet)o, cssAttrSet);
}
} else if (key instanceof CSS.Attribute) {
cssAttrSet.addAttribute(key, htmlAttrSet.getAttribute(key));
}
}
}
private void translateAttributes(HTML.Tag tag,
AttributeSet htmlAttrSet,
MutableAttributeSet cssAttrSet) {
Enumeration names = htmlAttrSet.getAttributeNames();
while (names.hasMoreElements()) {
Object name = names.nextElement();
if (name instanceof HTML.Attribute) {
HTML.Attribute key = (HTML.Attribute)name;
/*
* HTML.Attribute.ALIGN needs special processing.
* It can map to 1 of many(3) possible CSS attributes
* depending on the nature of the tag the attribute is
* part off and depending on the value of the attribute.
*/
if (key == HTML.Attribute.ALIGN) {
String htmlAttrValue = (String)htmlAttrSet.getAttribute(HTML.Attribute.ALIGN);
if (htmlAttrValue != null) {
CSS.Attribute cssAttr = getCssAlignAttribute(tag, htmlAttrSet);
if (cssAttr != null) {
Object o = getCssValue(cssAttr, htmlAttrValue);
if (o != null) {
cssAttrSet.addAttribute(cssAttr, o);
}
}
}
} else {
if (key == HTML.Attribute.SIZE && !isHTMLFontTag(tag)) {
/*
* The html size attribute has a mapping in the CSS world only
* if it is par of a font or base font tag.
*/
} else if (tag == HTML.Tag.TABLE && key == HTML.Attribute.BORDER) {
int borderWidth = getTableBorder(htmlAttrSet);
if (borderWidth > 0) {
translateAttribute(HTML.Attribute.BORDER, Integer.toString(borderWidth), cssAttrSet);
}
} else {
translateAttribute(key, (String) htmlAttrSet.getAttribute(key), cssAttrSet);
}
}
} else if (name instanceof CSS.Attribute) {
cssAttrSet.addAttribute(name, htmlAttrSet.getAttribute(name));
}
}
}
private void translateAttribute(HTML.Attribute key,
String htmlAttrValue,
MutableAttributeSet cssAttrSet) {
/*
* In the case of all remaining HTML.Attribute's they
* map to 1 or more CCS.Attribute.
*/
CSS.Attribute[] cssAttrList = getCssAttribute(key);
if (cssAttrList == null || htmlAttrValue == null) {
return;
}
for (Attribute cssAttr : cssAttrList) {
Object o = getCssValue(cssAttr, htmlAttrValue);
if (o != null) {
cssAttrSet.addAttribute(cssAttr , o);
}
}
}
/**
* Given a CSS.Attribute object and its corresponding HTML.Attribute's
* value, this method returns a CssValue object to associate with the
* CSS attribute.
*
* @param cssAttr the CSS.Attribute
* @param htmlAttrValue a String containing the value associated HTML.Attribute.
*/
Object getCssValue(CSS.Attribute cssAttr, String htmlAttrValue) {
CssValue value = (CssValue)valueConvertor.get(cssAttr);
Object o = value.parseHtmlValue(htmlAttrValue);
return o;
}
/**
* Maps an HTML.Attribute object to its appropriate CSS.Attributes.
*
* @param hAttr HTML.Attribute
* @return CSS.Attribute[]
*/
private CSS.Attribute[] getCssAttribute(HTML.Attribute hAttr) {
return htmlAttrToCssAttrMap.get(hAttr);
}
/**
* Maps HTML.Attribute.ALIGN to either:
* CSS.Attribute.TEXT_ALIGN
* CSS.Attribute.FLOAT
* CSS.Attribute.VERTICAL_ALIGN
* based on the tag associated with the attribute and the
* value of the attribute.
*
* @param tag the AttributeSet containing HTML attributes.
* @return CSS.Attribute mapping for HTML.Attribute.ALIGN.
*/
private CSS.Attribute getCssAlignAttribute(HTML.Tag tag,
AttributeSet htmlAttrSet) {
return CSS.Attribute.TEXT_ALIGN;
/*
String htmlAttrValue = (String)htmlAttrSet.getAttribute(HTML.Attribute.ALIGN);
CSS.Attribute cssAttr = CSS.Attribute.TEXT_ALIGN;
if (htmlAttrValue != null && htmlAttrSet instanceof Element) {
Element elem = (Element)htmlAttrSet;
if (!elem.isLeaf() && tag.isBlock() && validTextAlignValue(htmlAttrValue)) {
return CSS.Attribute.TEXT_ALIGN;
} else if (isFloater(htmlAttrValue)) {
return CSS.Attribute.FLOAT;
} else if (elem.isLeaf()) {
return CSS.Attribute.VERTICAL_ALIGN;
}
}
return null;
*/
}
/**
* Fetches the tag associated with the HTML AttributeSet.
*
* @param htmlAttrSet the AttributeSet containing the HTML attributes.
* @return HTML.Tag
*/
private HTML.Tag getHTMLTag(AttributeSet htmlAttrSet) {
Object o = htmlAttrSet.getAttribute(StyleConstants.NameAttribute);
if (o instanceof HTML.Tag) {
HTML.Tag tag = (HTML.Tag) o;
return tag;
}
return null;
}
private boolean isHTMLFontTag(HTML.Tag tag) {
return (tag != null && ((tag == HTML.Tag.FONT) || (tag == HTML.Tag.BASEFONT)));
}
private boolean isFloater(String alignValue) {
return (alignValue.equals("left") || alignValue.equals("right"));
}
private boolean validTextAlignValue(String alignValue) {
return (isFloater(alignValue) || alignValue.equals("center"));
}
/**
* Base class to CSS values in the attribute sets. This
* is intended to act as a convertor to/from other attribute
* formats.
*
* The CSS parser uses the parseCssValue method to convert
* a string to whatever format is appropriate a given key
* (i.e. these convertors are stored in a map using the
* CSS.Attribute as a key and the CssValue as the value).
*
* The HTML to CSS conversion process first converts the
* HTML.Attribute to a CSS.Attribute, and then calls
* the parseHtmlValue method on the value of the HTML
* attribute to produce the corresponding CSS value.
*
* The StyleConstants to CSS conversion process first
* converts the StyleConstants attribute to a
* CSS.Attribute, and then calls the fromStyleConstants
* method to convert the StyleConstants value to a
* CSS value.
*
* The CSS to StyleConstants conversion process first
* converts the StyleConstants attribute to a
* CSS.Attribute, and then calls the toStyleConstants
* method to convert the CSS value to a StyleConstants
* value.
*/
@SuppressWarnings("serial") // Same-version serialization only
static class CssValue implements Serializable {
/**
* Convert a CSS value string to the internal format
* (for fast processing) used in the attribute sets.
* The fallback storage for any value that we don't
* have a special binary format for is a String.
*/
Object parseCssValue(String value) {
return value;
}
/**
* Convert an HTML attribute value to a CSS attribute
* value. If there is no conversion, return null.
* This is implemented to simply forward to the CSS
* parsing by default (since some of the attribute
* values are the same). If the attribute value
* isn't recognized as a CSS value it is generally
* returned as null.
*/
Object parseHtmlValue(String value) {
return parseCssValue(value);
}
/**
* Converts a StyleConstants attribute value to
* a CSS attribute value. If there is no conversion,
* returns null. By default, there is no conversion.
*
* @param key the StyleConstants attribute
* @param value the value of a StyleConstants
* attribute to be converted
* @return the CSS value that represents the
* StyleConstants value
*/
Object fromStyleConstants(StyleConstants key, Object value) {
return null;
}
/**
* Converts a CSS attribute value to a
* StyleConstants
* value. If there is no conversion, returns
* null.
* By default, there is no conversion.
*
* @param key the StyleConstants attribute
* @param v the view containing AttributeSet
* @return the StyleConstants attribute value that
* represents the CSS attribute value
*/
Object toStyleConstants(StyleConstants key, View v) {
return null;
}
/**
* Return the CSS format of the value
*/
public String toString() {
return svalue;
}
/**
* The value as a string... before conversion to a
* binary format.
*/
String svalue;
}
/**
* By default CSS attributes are represented as simple
* strings. They also have no conversion to/from
* StyleConstants by default. This class represents the
* value as a string (via the superclass), but
* provides StyleConstants conversion support for the
* CSS attributes that are held as strings.
*/
@SuppressWarnings("serial") // Same-version serialization only
static class StringValue extends CssValue {
/**
* Convert a CSS value string to the internal format
* (for fast processing) used in the attribute sets.
* This produces a StringValue, so that it can be
* used to convert from CSS to StyleConstants values.
*/
Object parseCssValue(String value) {
StringValue sv = new StringValue();
sv.svalue = value;
return sv;
}
/**
* Converts a StyleConstants attribute value to
* a CSS attribute value. If there is no conversion
* returns null.
*
* @param key the StyleConstants attribute
* @param value the value of a StyleConstants
* attribute to be converted
* @return the CSS value that represents the
* StyleConstants value
*/
Object fromStyleConstants(StyleConstants key, Object value) {
if (key == StyleConstants.Italic) {
if (value.equals(Boolean.TRUE)) {
return parseCssValue("italic");
}
return parseCssValue("");
} else if (key == StyleConstants.Underline) {
if (value.equals(Boolean.TRUE)) {
return parseCssValue("underline");
}
return parseCssValue("");
} else if (key == StyleConstants.Alignment) {
int align = ((Integer)value).intValue();
String ta;
switch(align) {
case StyleConstants.ALIGN_LEFT:
ta = "left";
break;
case StyleConstants.ALIGN_RIGHT:
ta = "right";
break;
case StyleConstants.ALIGN_CENTER:
ta = "center";
break;
case StyleConstants.ALIGN_JUSTIFIED:
ta = "justify";
break;
default:
ta = "left";
}
return parseCssValue(ta);
} else if (key == StyleConstants.StrikeThrough) {
if (value.equals(Boolean.TRUE)) {
return parseCssValue("line-through");
}
return parseCssValue("");
} else if (key == StyleConstants.Superscript) {
if (value.equals(Boolean.TRUE)) {
return parseCssValue("super");
}
return parseCssValue("");
} else if (key == StyleConstants.Subscript) {
if (value.equals(Boolean.TRUE)) {
return parseCssValue("sub");
}
return parseCssValue("");
}
return null;
}
/**
* Converts a CSS attribute value to a
* StyleConstants value.
* If there is no conversion, returns null.
* By default, there is no conversion.
*
* @param key the StyleConstants attribute
* @return the StyleConstants attribute value that
* represents the CSS attribute value
*/
Object toStyleConstants(StyleConstants key, View v) {
if (key == StyleConstants.Italic) {
if (svalue.indexOf("italic") >= 0) {
return Boolean.TRUE;
}
return Boolean.FALSE;
} else if (key == StyleConstants.Underline) {
if (svalue.indexOf("underline") >= 0) {
return Boolean.TRUE;
}
return Boolean.FALSE;
} else if (key == StyleConstants.Alignment) {
if (svalue.equals("right")) {
return StyleConstants.ALIGN_RIGHT;
} else if (svalue.equals("center")) {
return StyleConstants.ALIGN_CENTER;
} else if (svalue.equals("justify")) {
return StyleConstants.ALIGN_JUSTIFIED;
}
return StyleConstants.ALIGN_LEFT;
} else if (key == StyleConstants.StrikeThrough) {
if (svalue.indexOf("line-through") >= 0) {
return Boolean.TRUE;
}
return Boolean.FALSE;
} else if (key == StyleConstants.Superscript) {
if (svalue.indexOf("super") >= 0) {
return Boolean.TRUE;
}
return Boolean.FALSE;
} else if (key == StyleConstants.Subscript) {
if (svalue.indexOf("sub") >= 0) {
return Boolean.TRUE;
}
return Boolean.FALSE;
}
return null;
}
// Used by ViewAttributeSet
boolean isItalic() {
return (svalue.indexOf("italic") != -1);
}
boolean isStrike() {
return (svalue.indexOf("line-through") != -1);
}
boolean isUnderline() {
return (svalue.indexOf("underline") != -1);
}
boolean isSub() {
return (svalue.indexOf("sub") != -1);
}
boolean isSup() {
return (svalue.indexOf("sup") != -1);
}
}
/**
* Represents a value for the CSS.FONT_SIZE attribute.
* The binary format of the value can be one of several
* types. If the type is Float,
* the value is specified in terms of point or
* percentage, depending upon the ending of the
* associated string.
* If the type is Integer, the value is specified
* in terms of a size index.
*/
@SuppressWarnings("serial") // Same-version serialization only
class FontSize extends CssValue {
/**
* Returns the size in points. This is ultimately
* what we need for the purpose of creating/fetching
* a Font object.
*
* @param a the attribute set the value is being
* requested from. We may need to walk up the
* resolve hierarchy if it's relative.
*/
int getValue(AttributeSet a, StyleSheet ss) {
ss = getStyleSheet(ss);
if (index) {
// it's an index, translate from size table
return Math.round(getPointSize((int) value, ss));
}
else if (lu == null) {
return Math.round(value);
}
else {
if (lu.type == 0) {
boolean isW3CLengthUnits = (ss == null) ? false : ss.isW3CLengthUnits();
return Math.round(lu.getValue(isW3CLengthUnits));
}
if (a != null) {
AttributeSet resolveParent = a.getResolveParent();
if (resolveParent != null) {
int pValue = StyleConstants.getFontSize(resolveParent);
float retValue;
if (lu.type == 1 || lu.type == 3) {
retValue = lu.value * (float)pValue;
}
else {
retValue = lu.value + (float)pValue;
}
return Math.round(retValue);
}
}
// a is null, or no resolve parent.
return 12;
}
}
Object parseCssValue(String value) {
FontSize fs = new FontSize();
fs.svalue = value;
try {
if (value.equals("xx-small")) {
fs.value = 1;
fs.index = true;
} else if (value.equals("x-small")) {
fs.value = 2;
fs.index = true;
} else if (value.equals("small")) {
fs.value = 3;
fs.index = true;
} else if (value.equals("medium")) {
fs.value = 4;
fs.index = true;
} else if (value.equals("large")) {
fs.value = 5;
fs.index = true;
} else if (value.equals("x-large")) {
fs.value = 6;
fs.index = true;
} else if (value.equals("xx-large")) {
fs.value = 7;
fs.index = true;
} else {
fs.lu = new LengthUnit(value, (short)1, 1f);
}
// relative sizes, larger | smaller (adjust from parent by
// 1.5 pixels)
// em, ex refer to parent sizes
// lengths: pt, mm, cm, pc, in, px
// em (font height 3em would be 3 times font height)
// ex (height of X)
// lengths are (+/-) followed by a number and two letter
// unit identifier
} catch (NumberFormatException nfe) {
fs = null;
}
return fs;
}
Object parseHtmlValue(String value) {
if ((value == null) || (value.length() == 0)) {
return null;
}
FontSize fs = new FontSize();
fs.svalue = value;
try {
/*
* relative sizes in the size attribute are relative
* to the 's size.
*/
int baseFontSize = getBaseFontSize();
if (value.charAt(0) == '+') {
int relSize = Integer.valueOf(value.substring(1)).intValue();
fs.value = baseFontSize + relSize;
fs.index = true;
} else if (value.charAt(0) == '-') {
int relSize = -Integer.valueOf(value.substring(1)).intValue();
fs.value = baseFontSize + relSize;
fs.index = true;
} else {
fs.value = Integer.parseInt(value);
if (fs.value > 7) {
fs.value = 7;
} else if (fs.value < 0) {
fs.value = 0;
}
fs.index = true;
}
} catch (NumberFormatException nfe) {
fs = null;
}
return fs;
}
/**
* Converts a StyleConstants attribute value to
* a CSS attribute value. If there is no conversion
* returns null. By default, there is no conversion.
*
* @param key the StyleConstants attribute
* @param value the value of a StyleConstants
* attribute to be converted
* @return the CSS value that represents the
* StyleConstants value
*/
Object fromStyleConstants(StyleConstants key, Object value) {
if (value instanceof Number) {
FontSize fs = new FontSize();
fs.value = getIndexOfSize(((Number)value).floatValue(), StyleSheet.sizeMapDefault);
fs.svalue = Integer.toString((int)fs.value);
fs.index = true;
return fs;
}
return parseCssValue(value.toString());
}
/**
* Converts a CSS attribute value to a StyleConstants
* value. If there is no conversion, returns null.
* By default, there is no conversion.
*
* @param key the StyleConstants attribute
* @return the StyleConstants attribute value that
* represents the CSS attribute value
*/
Object toStyleConstants(StyleConstants key, View v) {
if (v != null) {
return Integer.valueOf(getValue(v.getAttributes(), null));
}
return Integer.valueOf(getValue(null, null));
}
float value;
boolean index;
LengthUnit lu;
}
@SuppressWarnings("serial") // Same-version serialization only
static class FontFamily extends CssValue {
/**
* Returns the font family to use.
*/
String getValue() {
return family;
}
Object parseCssValue(String value) {
int cIndex = value.indexOf(',');
FontFamily ff = new FontFamily();
ff.svalue = value;
ff.family = null;
if (cIndex == -1) {
setFontName(ff, value);
}
else {
boolean done = false;
int lastIndex;
int length = value.length();
cIndex = 0;
while (!done) {
// skip ws.
while (cIndex < length &&
Character.isWhitespace(value.charAt(cIndex)))
cIndex++;
// Find next ','
lastIndex = cIndex;
cIndex = value.indexOf(',', cIndex);
if (cIndex == -1) {
cIndex = length;
}
if (lastIndex < length) {
if (lastIndex != cIndex) {
int lastCharIndex = cIndex;
if (cIndex > 0 && value.charAt(cIndex - 1) == ' '){
lastCharIndex--;
}
setFontName(ff, value.substring
(lastIndex, lastCharIndex));
done = (ff.family != null);
}
cIndex++;
}
else {
done = true;
}
}
}
if (ff.family == null) {
ff.family = Font.SANS_SERIF;
}
return ff;
}
private void setFontName(FontFamily ff, String fontName) {
ff.family = fontName;
}
Object parseHtmlValue(String value) {
// TBD
return parseCssValue(value);
}
/**
* Converts a StyleConstants attribute value to
* a CSS attribute value. If there is no conversion
* returns null. By default, there is no conversion.
*
* @param key the StyleConstants attribute
* @param value the value of a StyleConstants
* attribute to be converted
* @return the CSS value that represents the
* StyleConstants value
*/
Object fromStyleConstants(StyleConstants key, Object value) {
return parseCssValue(value.toString());
}
/**
* Converts a CSS attribute value to a StyleConstants
* value. If there is no conversion, returns null.
* By default, there is no conversion.
*
* @param key the StyleConstants attribute
* @return the StyleConstants attribute value that
* represents the CSS attribute value
*/
Object toStyleConstants(StyleConstants key, View v) {
return family;
}
String family;
}
@SuppressWarnings("serial") // Same-version serialization only
static class FontWeight extends CssValue {
int getValue() {
return weight;
}
Object parseCssValue(String value) {
FontWeight fw = new FontWeight();
fw.svalue = value;
if (value.equals("bold")) {
fw.weight = 700;
} else if (value.equals("normal")) {
fw.weight = 400;
} else {
// PENDING(prinz) add support for relative values
try {
fw.weight = Integer.parseInt(value);
} catch (NumberFormatException nfe) {
fw = null;
}
}
return fw;
}
/**
* Converts a StyleConstants attribute value to
* a CSS attribute value. If there is no conversion
* returns null. By default, there is no conversion.
*
* @param key the StyleConstants attribute
* @param value the value of a StyleConstants
* attribute to be converted
* @return the CSS value that represents the
* StyleConstants value
*/
Object fromStyleConstants(StyleConstants key, Object value) {
if (value.equals(Boolean.TRUE)) {
return parseCssValue("bold");
}
return parseCssValue("normal");
}
/**
* Converts a CSS attribute value to a StyleConstants
* value. If there is no conversion, returns null.
* By default, there is no conversion.
*
* @param key the StyleConstants attribute
* @return the StyleConstants attribute value that
* represents the CSS attribute value
*/
Object toStyleConstants(StyleConstants key, View v) {
return (weight > 500) ? Boolean.TRUE : Boolean.FALSE;
}
boolean isBold() {
return (weight > 500);
}
int weight;
}
@SuppressWarnings("serial") // Same-version serialization only
static class ColorValue extends CssValue {
/**
* Returns the color to use.
*/
Color getValue() {
return c;
}
Object parseCssValue(String value) {
Color c = stringToColor(value);
if (c != null) {
ColorValue cv = new ColorValue();
cv.svalue = value;
cv.c = c;
return cv;
}
return null;
}
Object parseHtmlValue(String value) {
return parseCssValue(value);
}
/**
* Converts a StyleConstants attribute value to
* a CSS attribute value. If there is no conversion
* returns null. By default, there is no conversion.
*
* @param key the StyleConstants attribute
* @param value the value of a StyleConstants
* attribute to be converted
* @return the CSS value that represents the
* StyleConstants value
*/
Object fromStyleConstants(StyleConstants key, Object value) {
ColorValue colorValue = new ColorValue();
colorValue.c = (Color)value;
colorValue.svalue = colorToHex(colorValue.c);
return colorValue;
}
/**
* Converts a CSS attribute value to a StyleConstants
* value. If there is no conversion, returns null.
* By default, there is no conversion.
*
* @param key the StyleConstants attribute
* @return the StyleConstants attribute value that
* represents the CSS attribute value
*/
Object toStyleConstants(StyleConstants key, View v) {
return c;
}
Color c;
}
@SuppressWarnings("serial") // Same-version serialization only
static class BorderStyle extends CssValue {
CSS.Value getValue() {
return style;
}
Object parseCssValue(String value) {
CSS.Value cssv = CSS.getValue(value);
if (cssv != null) {
if ((cssv == CSS.Value.INSET) ||
(cssv == CSS.Value.OUTSET) ||
(cssv == CSS.Value.NONE) ||
(cssv == CSS.Value.DOTTED) ||
(cssv == CSS.Value.DASHED) ||
(cssv == CSS.Value.SOLID) ||
(cssv == CSS.Value.DOUBLE) ||
(cssv == CSS.Value.GROOVE) ||
(cssv == CSS.Value.RIDGE)) {
BorderStyle bs = new BorderStyle();
bs.svalue = value;
bs.style = cssv;
return bs;
}
}
return null;
}
private void writeObject(java.io.ObjectOutputStream s)
throws IOException {
s.defaultWriteObject();
if (style == null) {
s.writeObject(null);
}
else {
s.writeObject(style.toString());
}
}
private void readObject(ObjectInputStream s)
throws ClassNotFoundException, IOException {
s.defaultReadObject();
Object value = s.readObject();
if (value != null) {
style = CSS.getValue((String)value);
}
}
// CSS.Values are static, don't archive it.
private transient CSS.Value style;
}
@SuppressWarnings("serial") // Same-version serialization only
static class LengthValue extends CssValue {
/**
* if this length value may be negative.
*/
boolean mayBeNegative;
LengthValue() {
this(false);
}
LengthValue(boolean mayBeNegative) {
this.mayBeNegative = mayBeNegative;
}
/**
* Returns the length (span) to use.
*/
float getValue() {
return getValue(false);
}
float getValue(boolean isW3CLengthUnits) {
return getValue(0, isW3CLengthUnits);
}
/**
* Returns the length (span) to use. If the value represents
* a percentage, it is scaled based on currentValue.
*/
float getValue(float currentValue) {
return getValue(currentValue, false);
}
float getValue(float currentValue, boolean isW3CLengthUnits) {
if (percentage) {
return span * currentValue;
}
return LengthUnit.getValue(span, units, isW3CLengthUnits);
}
/**
* Returns true if the length represents a percentage of the
* containing box.
*/
boolean isPercentage() {
return percentage;
}
Object parseCssValue(String value) {
LengthValue lv;
try {
// Assume pixels
float absolute = Float.valueOf(value).floatValue();
lv = new LengthValue();
lv.span = absolute;
} catch (NumberFormatException nfe) {
// Not pixels, use LengthUnit
LengthUnit lu = new LengthUnit(value,
LengthUnit.UNINITALIZED_LENGTH,
0);
// PENDING: currently, we only support absolute values and
// percentages.
switch (lu.type) {
case 0:
// Absolute
lv = new LengthValue();
lv.span =
(mayBeNegative) ? lu.value : Math.max(0, lu.value);
lv.units = lu.units;
break;
case 1:
// %
lv = new LengthValue();
lv.span = Math.max(0, Math.min(1, lu.value));
lv.percentage = true;
break;
default:
return null;
}
}
lv.svalue = value;
return lv;
}
Object parseHtmlValue(String value) {
if (value.equals(HTML.NULL_ATTRIBUTE_VALUE)) {
value = "1";
}
return parseCssValue(value);
}
/**
* Converts a StyleConstants attribute value to
* a CSS attribute value. If there is no conversion,
* returns null. By default, there is no conversion.
*
* @param key the StyleConstants attribute
* @param value the value of a StyleConstants
* attribute to be converted
* @return the CSS value that represents the
* StyleConstants value
*/
Object fromStyleConstants(StyleConstants key, Object value) {
LengthValue v = new LengthValue();
v.svalue = value.toString();
v.span = ((Float)value).floatValue();
return v;
}
/**
* Converts a CSS attribute value to a StyleConstants
* value. If there is no conversion, returns null.
* By default, there is no conversion.
*
* @param key the StyleConstants attribute
* @return the StyleConstants attribute value that
* represents the CSS attribute value
*/
Object toStyleConstants(StyleConstants key, View v) {
return Float.valueOf(getValue(false));
}
/** If true, span is a percentage value, and that to determine
* the length another value needs to be passed in. */
boolean percentage;
/** Either the absolute value (percentage == false) or
* a percentage value. */
float span;
String units = null;
}
/**
* BorderWidthValue is used to model BORDER_XXX_WIDTH and adds support
* for the thin/medium/thick values.
*/
@SuppressWarnings("serial") // Same-version serialization only
static class BorderWidthValue extends LengthValue {
BorderWidthValue(String svalue, int index) {
this.svalue = svalue;
span = values[index];
percentage = false;
}
Object parseCssValue(String value) {
if (value != null) {
if (value.equals("thick")) {
return new BorderWidthValue(value, 2);
}
else if (value.equals("medium")) {
return new BorderWidthValue(value, 1);
}
else if (value.equals("thin")) {
return new BorderWidthValue(value, 0);
}
}
// Assume its a length.
return super.parseCssValue(value);
}
Object parseHtmlValue(String value) {
if (value == HTML.NULL_ATTRIBUTE_VALUE) {
return parseCssValue("medium");
}
return parseCssValue(value);
}
/** Values used to represent border width. */
private static final float[] values = { 1, 2, 4 };
}
/**
* Handles uniquing of CSS values, like lists, and background image
* repeating.
*/
@SuppressWarnings("serial") // Same-version serialization only
static class CssValueMapper extends CssValue {
Object parseCssValue(String value) {
Object retValue = cssValueToInternalValueMap.get(value);
if (retValue == null) {
retValue = cssValueToInternalValueMap.get(value.toLowerCase());
}
return retValue;
}
Object parseHtmlValue(String value) {
Object retValue = htmlValueToCssValueMap.get(value);
if (retValue == null) {
retValue = htmlValueToCssValueMap.get(value.toLowerCase());
}
return retValue;
}
}
/**
* Used for background images, to represent the position.
*/
@SuppressWarnings("serial") // Same-version serialization only
static class BackgroundPosition extends CssValue {
float horizontalPosition;
float verticalPosition;
// bitmask: bit 0, horizontal relative, bit 1 horizontal relative to
// font size, 2 vertical relative to size, 3 vertical relative to
// font size.
//
short relative;
Object parseCssValue(String value) {
// 'top left' and 'left top' both mean the same as '0% 0%'.
// 'top', 'top center' and 'center top' mean the same as '50% 0%'.
// 'right top' and 'top right' mean the same as '100% 0%'.
// 'left', 'left center' and 'center left' mean the same as
// '0% 50%'.
// 'center' and 'center center' mean the same as '50% 50%'.
// 'right', 'right center' and 'center right' mean the same as
// '100% 50%'.
// 'bottom left' and 'left bottom' mean the same as '0% 100%'.
// 'bottom', 'bottom center' and 'center bottom' mean the same as
// '50% 100%'.
// 'bottom right' and 'right bottom' mean the same as '100% 100%'.
String[] strings = CSS.parseStrings(value);
int count = strings.length;
BackgroundPosition bp = new BackgroundPosition();
bp.relative = 5;
bp.svalue = value;
if (count > 0) {
// bit 0 for vert, 1 hor, 2 for center
short found = 0;
int index = 0;
while (index < count) {
// First, check for keywords
String string = strings[index++];
if (string.equals("center")) {
found |= 4;
continue;
}
else {
if ((found & 1) == 0) {
if (string.equals("top")) {
found |= 1;
}
else if (string.equals("bottom")) {
found |= 1;
bp.verticalPosition = 1;
continue;
}
}
if ((found & 2) == 0) {
if (string.equals("left")) {
found |= 2;
bp.horizontalPosition = 0;
}
else if (string.equals("right")) {
found |= 2;
bp.horizontalPosition = 1;
}
}
}
}
if (found != 0) {
if ((found & 1) == 1) {
if ((found & 2) == 0) {
// vert and no horiz.
bp.horizontalPosition = .5f;
}
}
else if ((found & 2) == 2) {
// horiz and no vert.
bp.verticalPosition = .5f;
}
else {
// no horiz, no vert, but center
bp.horizontalPosition = bp.verticalPosition = .5f;
}
}
else {
// Assume lengths
LengthUnit lu = new LengthUnit(strings[0], (short)0, 0f);
if (lu.type == 0) {
bp.horizontalPosition = lu.value;
bp.relative = (short)(1 ^ bp.relative);
}
else if (lu.type == 1) {
bp.horizontalPosition = lu.value;
}
else if (lu.type == 3) {
bp.horizontalPosition = lu.value;
bp.relative = (short)((1 ^ bp.relative) | 2);
}
if (count > 1) {
lu = new LengthUnit(strings[1], (short)0, 0f);
if (lu.type == 0) {
bp.verticalPosition = lu.value;
bp.relative = (short)(4 ^ bp.relative);
}
else if (lu.type == 1) {
bp.verticalPosition = lu.value;
}
else if (lu.type == 3) {
bp.verticalPosition = lu.value;
bp.relative = (short)((4 ^ bp.relative) | 8);
}
}
else {
bp.verticalPosition = .5f;
}
}
}
return bp;
}
boolean isHorizontalPositionRelativeToSize() {
return ((relative & 1) == 1);
}
boolean isHorizontalPositionRelativeToFontSize() {
return ((relative & 2) == 2);
}
float getHorizontalPosition() {
return horizontalPosition;
}
boolean isVerticalPositionRelativeToSize() {
return ((relative & 4) == 4);
}
boolean isVerticalPositionRelativeToFontSize() {
return ((relative & 8) == 8);
}
float getVerticalPosition() {
return verticalPosition;
}
}
/**
* Used for BackgroundImages.
*/
@SuppressWarnings("serial") // Same-version serialization only
static class BackgroundImage extends CssValue {
private boolean loadedImage;
private ImageIcon image;
Object parseCssValue(String value) {
BackgroundImage retValue = new BackgroundImage();
retValue.svalue = value;
return retValue;
}
Object parseHtmlValue(String value) {
return parseCssValue(value);
}
// PENDING: this base is wrong for linked style sheets.
ImageIcon getImage(URL base) {
if (!loadedImage) {
synchronized(this) {
if (!loadedImage) {
URL url = CSS.getURL(base, svalue);
loadedImage = true;
if (url != null) {
image = new ImageIcon();
Image tmpImg = Toolkit.getDefaultToolkit().createImage(url);
if (tmpImg != null) {
image.setImage(tmpImg);
}
}
}
}
}
return image;
}
}
/**
* Parses a length value, this is used internally, and never added
* to an AttributeSet or returned to the developer.
*/
@SuppressWarnings("serial") // Same-version serialization only
static class LengthUnit implements Serializable {
static Hashtable lengthMapping = new Hashtable(6);
static Hashtable w3cLengthMapping = new Hashtable(6);
static {
lengthMapping.put("pt", Float.valueOf(1f));
// Not sure about 1.3, determined by experiementation.
lengthMapping.put("px", Float.valueOf(1.3f));
lengthMapping.put("mm", Float.valueOf(2.83464f));
lengthMapping.put("cm", Float.valueOf(28.3464f));
lengthMapping.put("pc", Float.valueOf(12f));
lengthMapping.put("in", Float.valueOf(72f));
int res = 72;
try {
res = Toolkit.getDefaultToolkit().getScreenResolution();
} catch (HeadlessException e) {
}
// mapping according to the CSS2 spec
w3cLengthMapping.put("pt", Float.valueOf(res/72f));
w3cLengthMapping.put("px", Float.valueOf(1f));
w3cLengthMapping.put("mm", Float.valueOf(res/25.4f));
w3cLengthMapping.put("cm", Float.valueOf(res/2.54f));
w3cLengthMapping.put("pc", Float.valueOf(res/6f));
w3cLengthMapping.put("in", Float.valueOf((float)res));
}
LengthUnit(String value, short defaultType, float defaultValue) {
parse(value, defaultType, defaultValue);
}
void parse(String value, short defaultType, float defaultValue) {
type = defaultType;
this.value = defaultValue;
int length = value.length();
if (length > 0 && value.charAt(length - 1) == '%') {
try {
this.value = Float.valueOf(value.substring(0, length - 1)).
floatValue() / 100.0f;
type = 1;
}
catch (NumberFormatException nfe) { }
}
if (length >= 2) {
units = value.substring(length - 2, length);
Float scale = lengthMapping.get(units);
if (scale != null) {
try {
this.value = Float.valueOf(value.substring(0,
length - 2)).floatValue();
type = 0;
}
catch (NumberFormatException nfe) { }
}
else if (units.equals("em") ||
units.equals("ex")) {
try {
this.value = Float.valueOf(value.substring(0,
length - 2)).floatValue();
type = 3;
}
catch (NumberFormatException nfe) { }
}
else if (value.equals("larger")) {
this.value = 2f;
type = 2;
}
else if (value.equals("smaller")) {
this.value = -2;
type = 2;
}
else {
// treat like points.
try {
this.value = Float.valueOf(value).floatValue();
type = 0;
} catch (NumberFormatException nfe) {}
}
}
else if (length > 0) {
// treat like points.
try {
this.value = Float.valueOf(value).floatValue();
type = 0;
} catch (NumberFormatException nfe) {}
}
}
float getValue(boolean w3cLengthUnits) {
Hashtable mapping = (w3cLengthUnits) ? w3cLengthMapping : lengthMapping;
float scale = 1;
if (units != null) {
Float scaleFloat = mapping.get(units);
if (scaleFloat != null) {
scale = scaleFloat.floatValue();
}
}
return this.value * scale;
}
static float getValue(float value, String units, Boolean w3cLengthUnits) {
Hashtable mapping = (w3cLengthUnits) ? w3cLengthMapping : lengthMapping;
float scale = 1;
if (units != null) {
Float scaleFloat = mapping.get(units);
if (scaleFloat != null) {
scale = scaleFloat.floatValue();
}
}
return value * scale;
}
public String toString() {
return type + " " + value;
}
// 0 - value indicates real value
// 1 - % value, value relative to depends upon key.
// 50% will have a value = .5
// 2 - add value to parent value.
// 3 - em/ex relative to font size of element (except for
// font-size, which is relative to parent).
short type;
float value;
String units = null;
static final short UNINITALIZED_LENGTH = (short)10;
}
/**
* Class used to parse font property. The font property is shorthand
* for the other font properties. This expands the properties, placing
* them in the attributeset.
*/
static class ShorthandFontParser {
/**
* Parses the shorthand font string value, placing the
* result in attr.
*/
static void parseShorthandFont(CSS css, String value,
MutableAttributeSet attr) {
// font is of the form:
// [ || || ]?
// [ / ]?
String[] strings = CSS.parseStrings(value);
int count = strings.length;
int index = 0;
// bitmask, 1 for style, 2 for variant, 3 for weight
short found = 0;
int maxC = Math.min(3, count);
// Check for font-style font-variant font-weight
while (index < maxC) {
if ((found & 1) == 0 && isFontStyle(strings[index])) {
css.addInternalCSSValue(attr, CSS.Attribute.FONT_STYLE,
strings[index++]);
found |= 1;
}
else if ((found & 2) == 0 && isFontVariant(strings[index])) {
css.addInternalCSSValue(attr, CSS.Attribute.FONT_VARIANT,
strings[index++]);
found |= 2;
}
else if ((found & 4) == 0 && isFontWeight(strings[index])) {
css.addInternalCSSValue(attr, CSS.Attribute.FONT_WEIGHT,
strings[index++]);
found |= 4;
}
else if (strings[index].equals("normal")) {
index++;
}
else {
break;
}
}
if ((found & 1) == 0) {
css.addInternalCSSValue(attr, CSS.Attribute.FONT_STYLE,
"normal");
}
if ((found & 2) == 0) {
css.addInternalCSSValue(attr, CSS.Attribute.FONT_VARIANT,
"normal");
}
if ((found & 4) == 0) {
css.addInternalCSSValue(attr, CSS.Attribute.FONT_WEIGHT,
"normal");
}
// string at index should be the font-size
if (index < count) {
String fontSize = strings[index];
int slashIndex = fontSize.indexOf('/');
if (slashIndex != -1) {
fontSize = fontSize.substring(0, slashIndex);
strings[index] = strings[index].substring(slashIndex);
}
else {
index++;
}
css.addInternalCSSValue(attr, CSS.Attribute.FONT_SIZE,
fontSize);
}
else {
css.addInternalCSSValue(attr, CSS.Attribute.FONT_SIZE,
"medium");
}
// Check for line height
if (index < count && strings[index].startsWith("/")) {
String lineHeight = null;
if (strings[index].equals("/")) {
if (++index < count) {
lineHeight = strings[index++];
}
}
else {
lineHeight = strings[index++].substring(1);
}
// line height
if (lineHeight != null) {
css.addInternalCSSValue(attr, CSS.Attribute.LINE_HEIGHT,
lineHeight);
}
else {
css.addInternalCSSValue(attr, CSS.Attribute.LINE_HEIGHT,
"normal");
}
}
else {
css.addInternalCSSValue(attr, CSS.Attribute.LINE_HEIGHT,
"normal");
}
// remainder of strings are font-family
if (index < count) {
String family = strings[index++];
while (index < count) {
family += " " + strings[index++];
}
css.addInternalCSSValue(attr, CSS.Attribute.FONT_FAMILY,
family);
}
else {
css.addInternalCSSValue(attr, CSS.Attribute.FONT_FAMILY,
Font.SANS_SERIF);
}
}
private static boolean isFontStyle(String string) {
return (string.equals("italic") ||
string.equals("oblique"));
}
private static boolean isFontVariant(String string) {
return (string.equals("small-caps"));
}
private static boolean isFontWeight(String string) {
if (string.equals("bold") || string.equals("bolder") ||
string.equals("italic") || string.equals("lighter")) {
return true;
}
// test for 100-900
return (string.length() == 3 &&
string.charAt(0) >= '1' && string.charAt(0) <= '9' &&
string.charAt(1) == '0' && string.charAt(2) == '0');
}
}
/**
* Parses the background property into its intrinsic values.
*/
static class ShorthandBackgroundParser {
/**
* Parses the shorthand font string value, placing the
* result in attr.
*/
static void parseShorthandBackground(CSS css, String value,
MutableAttributeSet attr) {
String[] strings = parseStrings(value);
int count = strings.length;
int index = 0;
// bitmask: 0 for image, 1 repeat, 2 attachment, 3 position,
// 4 color
short found = 0;
while (index < count) {
String string = strings[index++];
if ((found & 1) == 0 && isImage(string)) {
css.addInternalCSSValue(attr, CSS.Attribute.
BACKGROUND_IMAGE, string);
found |= 1;
}
else if ((found & 2) == 0 && isRepeat(string)) {
css.addInternalCSSValue(attr, CSS.Attribute.
BACKGROUND_REPEAT, string);
found |= 2;
}
else if ((found & 4) == 0 && isAttachment(string)) {
css.addInternalCSSValue(attr, CSS.Attribute.
BACKGROUND_ATTACHMENT, string);
found |= 4;
}
else if ((found & 8) == 0 && isPosition(string)) {
if (index < count && isPosition(strings[index])) {
css.addInternalCSSValue(attr, CSS.Attribute.
BACKGROUND_POSITION,
string + " " +
strings[index++]);
}
else {
css.addInternalCSSValue(attr, CSS.Attribute.
BACKGROUND_POSITION, string);
}
found |= 8;
}
else if ((found & 16) == 0 && isColor(string)) {
css.addInternalCSSValue(attr, CSS.Attribute.
BACKGROUND_COLOR, string);
found |= 16;
}
}
if ((found & 1) == 0) {
css.addInternalCSSValue(attr, CSS.Attribute.BACKGROUND_IMAGE,
null);
}
if ((found & 2) == 0) {
css.addInternalCSSValue(attr, CSS.Attribute.BACKGROUND_REPEAT,
"repeat");
}
if ((found & 4) == 0) {
css.addInternalCSSValue(attr, CSS.Attribute.
BACKGROUND_ATTACHMENT, "scroll");
}
if ((found & 8) == 0) {
css.addInternalCSSValue(attr, CSS.Attribute.
BACKGROUND_POSITION, null);
}
// Currently, there is no good way to express this.
/*
if ((found & 16) == 0) {
css.addInternalCSSValue(attr, CSS.Attribute.BACKGROUND_COLOR,
null);
}
*/
}
static boolean isImage(String string) {
return (string.startsWith("url(") && string.endsWith(")"));
}
static boolean isRepeat(String string) {
return (string.equals("repeat-x") || string.equals("repeat-y") ||
string.equals("repeat") || string.equals("no-repeat"));
}
static boolean isAttachment(String string) {
return (string.equals("fixed") || string.equals("scroll"));
}
static boolean isPosition(String string) {
return (string.equals("top") || string.equals("bottom") ||
string.equals("left") || string.equals("right") ||
string.equals("center") ||
(string.length() > 0 &&
Character.isDigit(string.charAt(0))));
}
static boolean isColor(String string) {
return (CSS.stringToColor(string) != null);
}
}
/**
* Used to parser margin and padding.
*/
static class ShorthandMarginParser {
/**
* Parses the shorthand margin/padding/border string
* value, placing the result in attr.
* names give the 4 instrinsic property names.
*/
static void parseShorthandMargin(CSS css, String value,
MutableAttributeSet attr,
CSS.Attribute[] names) {
String[] strings = parseStrings(value);
int count = strings.length;
int index = 0;
switch (count) {
case 0:
// empty string
return;
case 1:
// Identifies all values.
for (int counter = 0; counter < 4; counter++) {
css.addInternalCSSValue(attr, names[counter], strings[0]);
}
break;
case 2:
// 0 & 2 = strings[0], 1 & 3 = strings[1]
css.addInternalCSSValue(attr, names[0], strings[0]);
css.addInternalCSSValue(attr, names[2], strings[0]);
css.addInternalCSSValue(attr, names[1], strings[1]);
css.addInternalCSSValue(attr, names[3], strings[1]);
break;
case 3:
css.addInternalCSSValue(attr, names[0], strings[0]);
css.addInternalCSSValue(attr, names[1], strings[1]);
css.addInternalCSSValue(attr, names[2], strings[2]);
css.addInternalCSSValue(attr, names[3], strings[1]);
break;
default:
for (int counter = 0; counter < 4; counter++) {
css.addInternalCSSValue(attr, names[counter],
strings[counter]);
}
break;
}
}
}
static class ShorthandBorderParser {
static Attribute[] keys = {
Attribute.BORDER_TOP, Attribute.BORDER_RIGHT,
Attribute.BORDER_BOTTOM, Attribute.BORDER_LEFT,
};
static void parseShorthandBorder(MutableAttributeSet attributes,
CSS.Attribute key, String value) {
Object[] parts = new Object[CSSBorder.PARSERS.length];
String[] strings = parseStrings(value);
for (String s : strings) {
boolean valid = false;
for (int i = 0; i < parts.length; i++) {
Object v = CSSBorder.PARSERS[i].parseCssValue(s);
if (v != null) {
if (parts[i] == null) {
parts[i] = v;
valid = true;
}
break;
}
}
if (!valid) {
// Part is non-parseable or occurred more than once.
return;
}
}
// Unspecified parts get default values.
for (int i = 0; i < parts.length; i++) {
if (parts[i] == null) {
parts[i] = CSSBorder.DEFAULTS[i];
}
}
// Dispatch collected values to individual properties.
for (int i = 0; i < keys.length; i++) {
if ((key == Attribute.BORDER) || (key == keys[i])) {
for (int k = 0; k < parts.length; k++) {
attributes.addAttribute(
CSSBorder.ATTRIBUTES[k][i], parts[k]);
}
}
}
}
}
/**
* Calculate the requirements needed to tile the requirements
* given by the iterator that would be tiled. The calculation
* takes into consideration margin and border spacing.
*/
static SizeRequirements calculateTiledRequirements(LayoutIterator iter, SizeRequirements r) {
long minimum = 0;
long maximum = 0;
long preferred = 0;
int lastMargin = 0;
int totalSpacing = 0;
int n = iter.getCount();
for (int i = 0; i < n; i++) {
iter.setIndex(i);
int margin0 = lastMargin;
int margin1 = (int) iter.getLeadingCollapseSpan();
totalSpacing += Math.max(margin0, margin1);
preferred += (int) iter.getPreferredSpan(0);
minimum += iter.getMinimumSpan(0);
maximum += iter.getMaximumSpan(0);
lastMargin = (int) iter.getTrailingCollapseSpan();
}
totalSpacing += lastMargin;
totalSpacing += 2 * iter.getBorderWidth();
// adjust for the spacing area
minimum += totalSpacing;
preferred += totalSpacing;
maximum += totalSpacing;
// set return value
if (r == null) {
r = new SizeRequirements();
}
r.minimum = (minimum > Integer.MAX_VALUE) ? Integer.MAX_VALUE : (int)minimum;
r.preferred = (preferred > Integer.MAX_VALUE) ? Integer.MAX_VALUE :(int) preferred;
r.maximum = (maximum > Integer.MAX_VALUE) ? Integer.MAX_VALUE :(int) maximum;
return r;
}
/**
* Calculate a tiled layout for the given iterator.
* This should be done collapsing the neighboring
* margins to be a total of the maximum of the two
* neighboring margin areas as described in the CSS spec.
*/
static void calculateTiledLayout(LayoutIterator iter, int targetSpan) {
/*
* first pass, calculate the preferred sizes, adjustments needed because
* of margin collapsing, and the flexibility to adjust the sizes.
*/
long preferred = 0;
long currentPreferred;
int lastMargin = 0;
int totalSpacing = 0;
int n = iter.getCount();
int adjustmentWeightsCount = LayoutIterator.WorstAdjustmentWeight + 1;
//max gain we can get adjusting elements with adjustmentWeight <= i
long[] gain = new long[adjustmentWeightsCount];
//max loss we can get adjusting elements with adjustmentWeight <= i
long[] loss = new long[adjustmentWeightsCount];
for (int i = 0; i < adjustmentWeightsCount; i++) {
gain[i] = loss[i] = 0;
}
for (int i = 0; i < n; i++) {
iter.setIndex(i);
int margin0 = lastMargin;
int margin1 = (int) iter.getLeadingCollapseSpan();
iter.setOffset(Math.max(margin0, margin1));
totalSpacing += iter.getOffset();
currentPreferred = (long)iter.getPreferredSpan(targetSpan);
iter.setSpan((int) currentPreferred);
preferred += currentPreferred;
gain[iter.getAdjustmentWeight()] +=
(long)iter.getMaximumSpan(targetSpan) - currentPreferred;
loss[iter.getAdjustmentWeight()] +=
currentPreferred - (long)iter.getMinimumSpan(targetSpan);
lastMargin = (int) iter.getTrailingCollapseSpan();
}
totalSpacing += lastMargin;
totalSpacing += 2 * iter.getBorderWidth();
for (int i = 1; i < adjustmentWeightsCount; i++) {
gain[i] += gain[i - 1];
loss[i] += loss[i - 1];
}
/*
* Second pass, expand or contract by as much as possible to reach
* the target span. This takes the margin collapsing into account
* prior to adjusting the span.
*/
// determine the adjustment to be made
int allocated = targetSpan - totalSpacing;
long desiredAdjustment = allocated - preferred;
long[] adjustmentsArray = (desiredAdjustment > 0) ? gain : loss;
desiredAdjustment = Math.abs(desiredAdjustment);
int adjustmentLevel = 0;
for (;adjustmentLevel <= LayoutIterator.WorstAdjustmentWeight;
adjustmentLevel++) {
// adjustmentsArray[] is sorted. I do not bother about
// binary search though
if (adjustmentsArray[adjustmentLevel] >= desiredAdjustment) {
break;
}
}
float adjustmentFactor = 0.0f;
if (adjustmentLevel <= LayoutIterator.WorstAdjustmentWeight) {
desiredAdjustment -= (adjustmentLevel > 0) ?
adjustmentsArray[adjustmentLevel - 1] : 0;
if (desiredAdjustment != 0) {
float maximumAdjustment =
adjustmentsArray[adjustmentLevel] -
((adjustmentLevel > 0) ?
adjustmentsArray[adjustmentLevel - 1] : 0
);
adjustmentFactor = desiredAdjustment / maximumAdjustment;
}
}
// make the adjustments
int totalOffset = (int)iter.getBorderWidth();
for (int i = 0; i < n; i++) {
iter.setIndex(i);
iter.setOffset( iter.getOffset() + totalOffset);
if (iter.getAdjustmentWeight() < adjustmentLevel) {
iter.setSpan((int)
((allocated > preferred) ?
Math.floor(iter.getMaximumSpan(targetSpan)) :
Math.ceil(iter.getMinimumSpan(targetSpan))
)
);
} else if (iter.getAdjustmentWeight() == adjustmentLevel) {
int availableSpan = (allocated > preferred) ?
(int) iter.getMaximumSpan(targetSpan) - iter.getSpan() :
iter.getSpan() - (int) iter.getMinimumSpan(targetSpan);
int adj = (int)Math.floor(adjustmentFactor * availableSpan);
iter.setSpan(iter.getSpan() +
((allocated > preferred) ? adj : -adj));
}
totalOffset = (int) Math.min((long) iter.getOffset() +
(long) iter.getSpan(),
Integer.MAX_VALUE);
}
// while rounding we could lose several pixels.
int roundError = targetSpan - totalOffset -
(int)iter.getTrailingCollapseSpan() -
(int)iter.getBorderWidth();
int adj = (roundError > 0) ? 1 : -1;
roundError *= adj;
boolean canAdjust = true;
while (roundError > 0 && canAdjust) {
// check for infinite loop
canAdjust = false;
int offsetAdjust = 0;
// try to distribute roundError. one pixel per cell
for (int i = 0; i < n; i++) {
iter.setIndex(i);
iter.setOffset(iter.getOffset() + offsetAdjust);
int curSpan = iter.getSpan();
if (roundError > 0) {
int boundGap = (adj > 0) ?
(int)Math.floor(iter.getMaximumSpan(targetSpan)) - curSpan :
curSpan - (int)Math.ceil(iter.getMinimumSpan(targetSpan));
if (boundGap >= 1) {
canAdjust = true;
iter.setSpan(curSpan + adj);
offsetAdjust += adj;
roundError--;
}
}
}
}
}
/**
* An iterator to express the requirements to use when computing
* layout.
*/
interface LayoutIterator {
void setOffset(int offs);
int getOffset();
void setSpan(int span);
int getSpan();
int getCount();
void setIndex(int i);
float getMinimumSpan(float parentSpan);
float getPreferredSpan(float parentSpan);
float getMaximumSpan(float parentSpan);
int getAdjustmentWeight(); //0 is the best weight WorstAdjustmentWeight is a worst one
//float getAlignment();
float getBorderWidth();
float getLeadingCollapseSpan();
float getTrailingCollapseSpan();
public static final int WorstAdjustmentWeight = 2;
}
//
// Serialization support
//
private void writeObject(java.io.ObjectOutputStream s)
throws IOException
{
s.defaultWriteObject();
// Determine what values in valueConvertor need to be written out.
Enumeration keys = valueConvertor.keys();
s.writeInt(valueConvertor.size());
if (keys != null) {
while (keys.hasMoreElements()) {
Object key = keys.nextElement();
Object value = valueConvertor.get(key);
if (!(key instanceof Serializable) &&
(key = StyleContext.getStaticAttributeKey(key)) == null) {
// Should we throw an exception here?
key = null;
value = null;
}
else if (!(value instanceof Serializable) &&
(value = StyleContext.getStaticAttributeKey(value)) == null){
// Should we throw an exception here?
key = null;
value = null;
}
s.writeObject(key);
s.writeObject(value);
}
}
}
private void readObject(ObjectInputStream s)
throws ClassNotFoundException, IOException
{
ObjectInputStream.GetField f = s.readFields();
int newBaseFontSize = f.get("baseFontSize", 0);
setBaseFontSize(newBaseFontSize);
// Reconstruct the hashtable.
int numValues = s.readInt();
valueConvertor = new Hashtable<>();
while (numValues-- > 0) {
Object key = s.readObject();
Object value = s.readObject();
Object staticKey = StyleContext.getStaticAttribute(key);
if (staticKey != null) {
key = staticKey;
}
Object staticValue = StyleContext.getStaticAttribute(value);
if (staticValue != null) {
value = staticValue;
}
if (key != null && value != null) {
valueConvertor.put(key, value);
}
}
}
/*
* we need StyleSheet for resolving lenght units. (see
* isW3CLengthUnits)
* we can not pass stylesheet for handling relative sizes. (do not
* think changing public API is necessary)
* CSS is not likely to be accessed from more then one thread.
* Having local storage for StyleSheet for resolving relative
* sizes is safe
*
* idk 08/30/2004
*/
private StyleSheet getStyleSheet(StyleSheet ss) {
if (ss != null) {
styleSheet = ss;
}
return styleSheet;
}
//
// Instance variables
//
/** Maps from CSS key to CssValue. */
private transient Hashtable valueConvertor;
/** Size used for relative units. */
private int baseFontSize;
private transient StyleSheet styleSheet = null;
static int baseFontSizeIndex = 3;
}