/*
* {{{ header & license
* Copyright (c) 2007 Vianney le Clément
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation; either version 2.1
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
* }}}
*/
package org.xhtmlrenderer.swt;
import org.eclipse.swt.events.MouseEvent;
import org.eclipse.swt.events.MouseMoveListener;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.graphics.Rectangle;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.xhtmlrenderer.context.StyleReference;
import org.xhtmlrenderer.layout.LayoutContext;
import org.xhtmlrenderer.layout.PaintingInfo;
import org.xhtmlrenderer.render.Box;
/**
* Listener implementing css :hover class.
*
* @author Vianney le Clément
*
*/
public class HoverListener implements MouseMoveListener {
private final BasicRenderer _parent;
private Box _previousBox = null;
/**
* Construct a HoverListener and add it to the parent.
*
* @param parent
*/
public HoverListener(BasicRenderer parent) {
_parent = parent;
parent.addMouseMoveListener(this);
}
public void mouseMove(MouseEvent e) {
LayoutContext c = _parent.getLayoutContext();
if (c == null) {
return;
}
Box box = _parent.find(e.x, e.y);
Element previous = _parent.getHovered_element();
Element current = getHoveredElement(c.getCss(), box);
if (previous == current) {
return;
}
_parent.setHovered_element(current);
boolean needRepaint = false;
boolean targetedRepaint = true;
Rectangle repaintTarget = null;
if (previous != null) {
needRepaint = true;
_previousBox.restyle(c);
PaintingInfo paintInfo = _previousBox.getPaintingInfo();
if (paintInfo == null) {
targetedRepaint = false;
} else {
java.awt.Rectangle rect = paintInfo.getAggregateBounds();
repaintTarget = new Rectangle(rect.x, rect.y, rect.width,
rect.height);
}
_previousBox = null;
}
if (current != null) {
needRepaint = true;
Box target = box.getRestyleTarget();
target.restyle(c);
if (targetedRepaint) {
PaintingInfo paintInfo = target.getPaintingInfo();
if (paintInfo == null) {
targetedRepaint = false;
} else {
if (repaintTarget == null) {
java.awt.Rectangle rect = paintInfo
.getAggregateBounds();
repaintTarget = new Rectangle(rect.x, rect.y,
rect.width, rect.height);
} else {
java.awt.Rectangle rect = paintInfo
.getAggregateBounds();
repaintTarget.add(new Rectangle(rect.x, rect.y,
rect.width, rect.height));
}
}
}
_previousBox = box;
}
if (needRepaint) {
if (targetedRepaint) {
Point origin = _parent.getOrigin();
repaintTarget.x -= origin.x;
repaintTarget.y -= origin.y;
_parent.invalidate(repaintTarget);
} else {
_parent.invalidate();
}
}
}
private Element getHoveredElement(StyleReference style, Box ib) {
if (ib == null) {
return null;
}
Element element = ib.getElement();
while (element != null && !style.isHoverStyled(element)) {
Node node = element.getParentNode();
if (node.getNodeType() == Node.ELEMENT_NODE) {
element = (Element) node;
} else {
element = null;
}
}
return element;
}
}