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/*******************************************************************************
* Copyright (c) 2004, 2008 John Krasnay and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* John Krasnay - initial API and implementation
*******************************************************************************/
package org.eclipse.vex.core.internal.css;
import org.eclipse.vex.core.internal.core.DisplayDevice;
import org.eclipse.vex.core.internal.dom.Element;
import org.w3c.css.sac.LexicalUnit;
/**
* The CSS line-height property.
*/
public class LineHeightProperty extends AbstractProperty {
private static final float LINE_HEIGHT_NORMAL = 1.2f;
/**
* Class constructor.
*/
public LineHeightProperty() {
super(CSS.LINE_HEIGHT);
}
/**
* Calculates the value of the property given a LexicalUnit. Returns a RelativeLength that is relative to the
* current font size.
*/
public Object calculate(final LexicalUnit lu, final Styles parentStyles, final Styles styles, final Element element) {
final int ppi = DisplayDevice.getCurrent().getVerticalPPI();
if (isLength(lu)) {
return RelativeLength.createAbsolute(Math.round(getIntLength(lu, styles.getFontSize(), ppi) / styles.getFontSize()));
} else if (isNumber(lu)) {
if (getNumber(lu) <= 0) {
return RelativeLength.createRelative(LINE_HEIGHT_NORMAL);
} else {
return RelativeLength.createRelative(getNumber(lu));
}
} else if (isPercentage(lu)) {
if (lu.getFloatValue() <= 0) {
return RelativeLength.createRelative(LINE_HEIGHT_NORMAL);
} else {
return RelativeLength.createRelative(lu.getFloatValue() / 100);
}
} else {
// not specified, "inherit", or other unknown value
if (parentStyles == null) {
return RelativeLength.createRelative(LINE_HEIGHT_NORMAL);
} else {
return parentStyles.get(CSS.LINE_HEIGHT);
}
}
}
}
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