* Value: < alphavalue> || inherit
* Initial:1
* Applies to:all elements
* Inherited:no
* Percentages:no
* Media::visual
*
* This property sets the opacity of an element. *
* H1 { opacity: 0}
*
*/
public class CssOpacity extends CssProperty implements CssOperator {
String opaclevel;
ApplContext ac;
/**
* Create a new CssOpacity
*/
public CssOpacity() {
CssNumber cssnum = new CssNumber((float) 1.0);
opaclevel = cssnum.toString();
}
/**
* Create a new CssOpacity
*
* @param expression The expression for this property
* @exception InvalidParamException Values are incorrect
*/
public CssOpacity(ApplContext ac, CssExpression expression) throws InvalidParamException {
this.ac = ac;
setByUser(); // tell this property is set by the user
CssValue val = expression.getValue();
if (val instanceof CssNumber) {
CssNumber cssnum = new CssNumber(clampedValue(ac, ((CssNumber) val).getValue()));
opaclevel = cssnum.toString();
expression.next();
}
else if (val instanceof CssIdent) {
if (val.equals(inherit)) {
opaclevel = "inherit";
expression.next();
} else {
throw new InvalidParamException("value", val.toString(), getPropertyName(), ac);
}
}
else {
throw new InvalidParamException("value", val.toString(), getPropertyName(), ac);
}
}
/**
* Brings all values back between 0 and 1
*
* @param opac The value to be modified if necessary
*/
private float clampedValue(ApplContext ac, float opac) {
if (opac < 0 || opac > 1) {
ac.getFrame().addWarning("out-of-range", Util.displayFloat(opac));
return ((opac<0)?0:1);
}
else return(opac);
}
/**
* Add this property to the CssStyle.
*
* @param style The CssStyle
*/
public void addToStyle(ApplContext ac, CssStyle style) {
if (((Css3Style) style).cssOpacity != null)
style.addRedefinitionWarning(ac, this);
((Css3Style) style).cssOpacity = 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 ((Css3Style) style).getOpacity();
} else {
return ((Css3Style) style).cssOpacity;
}
}
/**
* Compares two properties for equality.
*
* @param value The other property.
*/
public boolean equals(CssProperty property) {
return (property instanceof CssOpacity &&
opaclevel.equals( ((CssOpacity) property).opaclevel));
}
/**
* Returns the name of this property
*/
public String getPropertyName() {
return "opacity";
}
/**
* Returns the value of this property
*/
public Object get() {
return opaclevel;
}
/**
* Returns true if this property is "softly" inherited
*/
public boolean isSoftlyInherited() {
return opaclevel.equals("inherit");
}
/**
* Returns a string representation of the object
*/
public String toString() {
return opaclevel;
}
/**
* Is the value of this property a default value
* It is used by all macro for the function print
*/
public boolean isDefault() {
CssNumber cssnum = new CssNumber(ac, (float) 1.0);
return opaclevel == cssnum.toString();
}
}