* Value: [<percentage> | <length>]{1,2} | [top | center
* | bottom] || [left | center | right]
* Initial: 0% 0%
* Applies to: block-level and replaced elements
* Inherited: no
* Percentage values: refer to the size of the element itself
*
If a background image has been specified, the value of * 'background-position' specifies its initial position. *
With a value pair of '0% 0%', the upper left corner of the image is * placed in the upper left corner of the box that surrounds the content of * the element (i.e., not the box that surrounds the padding, border or * margin). A value pair of '100% 100%' places the lower right corner of the * image in the lower right corner of the element. With a value pair of '14% * 84%', the point 14% across and 84% down the image is to be placed at the * point 14% across and 84% down the element. *
With a value pair of '2cm 2cm', the upper left corner of the image is * placed 2cm to the right and 2cm below the upper left corner of the element. *
If only one percentage or length value is given, it sets the horizontal * position only, the vertical position will be 50%. If two values are given, * the horizontal position comes first. Combinations of length and percentage * values are allowed, e.g. '50% 2cm'. Negative positions are allowed. *
One can also use keyword values to indicate the position of the * background image. Keywords cannot be combined with percentage values, or * length values. The possible combinations of keywords and their * interpretations are as follows: *
* examples: *
* BODY { background: url(banner.jpeg) right top } / * 100% 0% * /
* BODY { background: url(banner.jpeg) top center } / * 50% 0% * /
* BODY { background: url(banner.jpeg) center } / * 50% 50% * /
* BODY { background: url(banner.jpeg) bottom } / * 50% 100% * /
*
* * If the background image is fixed with regard to the canvas (see the * 'background-attachment' property above), the image is placed relative to * the canvas instead of the element. E.g.: *
* BODY {
* background-image: url(logo.png);
* background-attachment: fixed;
* background-position: 100% 100%;
* }
*
*
* In the example above, the image is placed in the lower right corner of the
* canvas.
* @version $Revision: 1.3 $
* @see CssBackgroundAttachment
*/
public class CssBackgroundPositionMob extends CssProperty
implements CssBackgroundConstants, CssOperator {
CssValue horizontal;
CssValue vertical;
/**
* Create a new CssBackgroundPositionMob
*/
public CssBackgroundPositionMob() {
horizontal = DefaultValue0;
vertical = DefaultValue0;
}
/**
* Creates a new CssBackgroundPositionMob
*
* @param expression The expression for this property
* @exception InvalidParamException Values are incorrect
*/
public CssBackgroundPositionMob(ApplContext ac, CssExpression expression,
boolean check) throws InvalidParamException {
if(check && expression.getCount() > 2) {
throw new InvalidParamException("unrecognize", ac);
}
setByUser();
CssValue val = expression.getValue();
char op = expression.getOperator();
int index;
if (op != SPACE)
throw new InvalidParamException("operator",
((new Character(op)).toString()),
ac);
if (val.equals(inherit)) {
if(expression.getCount() > 1) {
throw new InvalidParamException("unrecognize", ac);
}
horizontal = inherit;
vertical = inherit;
expression.next();
return;
} else if (val instanceof CssIdent
&& (index=IndexOfIdent((String) val.get())) != INVALID) {
CssValue next = expression.getNextValue();
if(next.equals(inherit)) {
throw new InvalidParamException("unrecognize", ac);
}
expression.next();
if (next == null) {
getPercentageFromIdent(index, INVALID);
} else if (next instanceof CssIdent) {
int index2 = IndexOfIdent((String) next.get());
if (index2 != INVALID) {
getPercentageFromIdent(index, index2);
expression.next();
} else {
getPercentageFromIdent(index, INVALID);
}
}
} else if (val instanceof CssLength ||
val instanceof CssPercentage || val instanceof CssNumber) {
if (val instanceof CssNumber) {
val = ((CssNumber) val).getLength();
}
horizontal = val;
expression.next();
val = expression.getValue();
if(val.equals(inherit)) {
throw new InvalidParamException("unrecognize", ac);
}
if (val instanceof CssLength ||
val instanceof CssPercentage || val instanceof CssNumber) {
if (val instanceof CssNumber) {
val = ((CssNumber) val).getLength();
}
vertical = val;
expression.next();
} else if(val != null) {
throw new InvalidParamException("value", expression.getValue(),
getPropertyName(), ac);
}
} else {
throw new InvalidParamException("value", expression.getValue(),
getPropertyName(), ac);
}
}
public CssBackgroundPositionMob(ApplContext ac, CssExpression expression)
throws InvalidParamException {
this(ac, expression, false);
}
/**
* Returns the value of this property
*/
public Object get() {
return horizontal;
}
/**
* Returns the name of this property
*/
public String getPropertyName() {
return "background-position";
}
/**
* Returns the horizontal value of the position
*/
public CssValue getHorizontalPosition() {
return horizontal;
}
/**
* Returns the vertical value of the position
*/
public CssValue getVerticalPosition() {
return vertical;
}
/**
* Returns true if this property is "softly" inherited
* e.g. his value equals inherit
*/
public boolean isSoftlyInherited() {
return horizontal == inherit;
}
/**
* Returns a string representation of the object.
*/
public String toString() {
if (horizontal == inherit) {
return inherit.toString();
} else {
String ret = "";
if (horizontal != null) {
ret += horizontal;
}
if (vertical != null) {
if (!ret.equals("")) {
ret += " ";
}
ret += vertical;
}
return ret;
}
}
private void getPercentageFromIdent(int first, int second) {
horizontal = DefaultValue50;
vertical = DefaultValue50;
if (first == POSITION_LEFT || second == POSITION_LEFT)
horizontal = DefaultValue0;
if (first == POSITION_RIGHT || second == POSITION_RIGHT)
horizontal = DefaultValue100;
if (first == POSITION_TOP || second == POSITION_TOP)
vertical = DefaultValue0;
if (first == POSITION_BOTTOM || second == POSITION_BOTTOM)
vertical = DefaultValue100;
}
/**
* Add this property to the CssStyle.
*
* @param style The CssStyle
*/
public void addToStyle(ApplContext ac, CssStyle style) {
CssBackgroundMob cssBackground = ((Css1Style) style).cssBackgroundMob;
if (cssBackground.position != null)
style.addRedefinitionWarning(ac, this);
cssBackground.position = this;
}
/**
* Get this property in the style.
*
* @param style The style where the property is
* @param resolve if true, resolve the style to find this property
*/
public CssProperty getPropertyInStyle(CssStyle style, boolean resolve) {
if (resolve) {
return ((Css1Style) style).getBackgroundPositionMob();
} else {
return ((Css1Style) style).cssBackgroundMob.position;
}
}
/**
* Compares two properties for equality.
*
* @param value The other property.
*/
public boolean equals(CssProperty property) {
return (property instanceof CssBackgroundPositionMob &&
horizontal.equals(((CssBackgroundPositionMob) property).horizontal)
&& vertical.equals(((CssBackgroundPositionMob) property).vertical));
}
/**
* Is the value of this property is a default value.
* It is used by all macro for the function print
*/
public boolean isDefault() {
return horizontal != null && vertical != null &&
horizontal.equals(DefaultValue0) && vertical.equals(DefaultValue0);
}
private int IndexOfIdent(String ident) throws InvalidParamException {
int hash = ident.hashCode();
for (int i = 0; i < POSITION.length; i++)
if (hash_values[i] == hash)
return i;
return -1;
}
private static int[] hash_values;
private static int INVALID = -1;
private static CssPercentage DefaultValue0 = new CssPercentage(0);
private static CssPercentage DefaultValue50 = new CssPercentage(50);
private static CssPercentage DefaultValue100 = new CssPercentage(100);
static {
hash_values = new int[POSITION.length];
for (int i = 0; i < POSITION.length; i++)
hash_values[i] = POSITION[i].hashCode();
}
}