org.w3c.css.properties.css1.CssLineHeight Maven / Gradle / Ivy
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//
// $Id: CssLineHeight.java,v 1.5 2010-01-05 13:49:43 ylafon Exp $
// From Philippe Le Hegaret ([email protected])
//
// (c) COPYRIGHT MIT and INRIA, 1997.
// Please first read the full copyright statement in file COPYRIGHT.html
package org.w3c.css.properties.css1;
import org.w3c.css.parser.CssStyle;
import org.w3c.css.properties.css.CssProperty;
import org.w3c.css.util.ApplContext;
import org.w3c.css.util.InvalidParamException;
import org.w3c.css.values.CssExpression;
import org.w3c.css.values.CssIdent;
import org.w3c.css.values.CssLength;
import org.w3c.css.values.CssNumber;
import org.w3c.css.values.CssPercentage;
import org.w3c.css.values.CssValue;
/**
*
* 'line-height'
*
*
* Value: normal | <number> | <length> |
* <percentage>
* Initial: normal
* Applies to: all elements
* Inherited: yes
* Percentage values: relative to the font size of the element itself
*
* The property sets the distance between two adjacent lines' baselines.
*
When a numerical value is specified, the line height is given by the
* font size of the current element multiplied with the numerical value. This
* differs from a percentage value in the way it inherits: when a numerical
* value is specified, child elements will inherit the factor itself, not the
* resultant value (as is the case with percentage and other units).
*
* Negative values are not allowed.
*
* The three rules in the example below have the same resultant line height:
*
* DIV { line-height: 1.2; font-size: 10pt } /* number * /
* DIV { line-height: 1.2em; font-size: 10pt } /* length * /
* DIV { line-height: 120%; font-size: 10pt } /* percentage * /
*
*
* @version $Revision: 1.5 $
*/
public class CssLineHeight extends CssProperty {
private CssValue value;
private static CssIdent normal = new CssIdent("normal");
private static CssIdent number = new CssIdent("number");
private static CssIdent none = new CssIdent("none");
private static CssIdent initial = new CssIdent("initial");
/**
* Create a new CssLineHeight
*/
public CssLineHeight() {
value = normal;
}
/**
* Creates a new CssLineHeight
*
* @param expression The expression for this property
* @exception InvalidParamException The expression is incorrect
*/
public CssLineHeight(ApplContext ac, CssExpression expression,
boolean check) throws InvalidParamException {
if(check && expression.getCount() > 1) {
throw new InvalidParamException("unrecognize", ac);
}
CssValue val = expression.getValue();
setByUser();
if (val instanceof CssNumber || val instanceof CssLength ||
val instanceof CssPercentage) {
float v = ((Number) val.get()).floatValue();
if (v >= 0) {
value = val;
expression.next();
return;
} else {
throw new InvalidParamException("negative-value",
Float.toString(v), ac);
}
} else if (inherit.equals(val)) {
value = inherit;
expression.next();
return;
} else if (normal.equals(val)) {
value = normal;
expression.next();
return;
} else if (number.equals(val)) {
value = number;
expression.next();
return;
} else if (none.equals(val)) {
value = none;
expression.next();
return;
} else if (initial.equals(val)) {
value = initial;
expression.next();
return;
}
throw new InvalidParamException("value", expression.getValue(),
getPropertyName(), ac);
}
public CssLineHeight(ApplContext ac, CssExpression expression)
throws InvalidParamException {
this(ac, expression, false);
}
/**
* Returns the value of this property
*/
public Object get() {
if (value == null)
return normal;
return value;
}
/**
* Returns the name of this property
*/
public String getPropertyName() {
return "line-height";
}
/**
* Returns true if this property is "softly" inherited
* e.g. his value equals inherit
*/
public boolean isSoftlyInherited() {
return value == inherit;
}
/**
* Returns a string representation of the object.
*/
public String toString() {
return value.toString();
}
/**
* Add this property to the CssStyle.
*
* @param style The CssStyle
*/
public void addToStyle(ApplContext ac, CssStyle style) {
CssFont cssFont = ((Css1Style) style).cssFont;
if (cssFont.lineHeight != null)
style.addRedefinitionWarning(ac, this);
cssFont.lineHeight = 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).getLineHeight();
} else {
return ((Css1Style) style).cssFont.lineHeight;
}
}
/**
* Compares two properties for equality.
*
* @param value The other property.
*/
public boolean equals(CssProperty property) {
return (property instanceof CssLineHeight &&
((CssLineHeight) property).value == value);
}
/**
* Is the value of this property is a default value.
* It is used by all macro for the function print
*/
public boolean isDefault() {
return value == normal;
}
}