/*
* {{{ header & license
* Copyright (c) 2007 xhtmlrenderer.dev.java.net
*
* 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.swing;
import java.awt.Rectangle;
import java.awt.event.MouseEvent;
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;
public class HoverListener implements FSMouseListener {
private Box _previouslyHovered;
public HoverListener() {
}
public void onMouseOut(BasicPanel panel, Box box) {
// Since we keep track of the most recently hovered element, we do not
// need to explicitly handle mouseout events. This way we only try to
// restyle elements that were actually hoverable to begin with.
}
public void onMouseOver(BasicPanel panel, Box box) {
LayoutContext c = panel.getLayoutContext();
if (c == null) {
return;
}
boolean needRepaint = false;
Element currentlyHovered = getHoveredElement(c.getCss(), box);
if (currentlyHovered == panel.hovered_element) {
return;
}
panel.hovered_element = currentlyHovered;
boolean targetedRepaint = true;
Rectangle repaintRegion = null;
// If we moved out of the old block then unstyle it
if (_previouslyHovered != null) {
needRepaint = true;
_previouslyHovered.restyle(c);
PaintingInfo paintInfo = _previouslyHovered.getPaintingInfo();
if (paintInfo == null) {
targetedRepaint = false;
} else {
repaintRegion = new Rectangle(paintInfo.getAggregateBounds());
}
_previouslyHovered = null;
}
if (currentlyHovered != null) {
needRepaint = true;
Box target = box.getRestyleTarget();
target.restyle(c);
if (targetedRepaint) {
PaintingInfo paintInfo = target.getPaintingInfo();
if (paintInfo == null) {
targetedRepaint = false;
} else {
if (repaintRegion == null) {
repaintRegion = new Rectangle(paintInfo.getAggregateBounds());
} else {
repaintRegion.add(paintInfo.getAggregateBounds());
}
}
}
_previouslyHovered = target;
}
if (needRepaint) {
if (targetedRepaint) {
panel.repaint(repaintRegion);
} else {
panel.repaint();
}
}
}
public void onMouseUp(BasicPanel panel, Box box) {
}
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;
}
public void reset() {
_previouslyHovered = null;
}
public void onMouseDragged(BasicPanel panel, MouseEvent e) {
}
public void onMousePressed(BasicPanel panel, MouseEvent e) {
}
}