/*
* {{{ header & license
* Copyright (c) 2004, 2005 Joshua Marinacci, Torbjoern Gannholm
* Copyright (c) 2005 Wisconsin Court System
*
* 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.layout;
import java.util.List;
import org.xhtmlrenderer.css.constants.CSSName;
import org.xhtmlrenderer.render.BlockBox;
import org.xhtmlrenderer.render.LineBox;
import org.xhtmlrenderer.render.MarkerData;
/**
* Contains utility methods to layout floated and absolute content.
*
* XXX Could/should be folded into BlockBox
*/
public class LayoutUtil {
public static void layoutAbsolute(
LayoutContext c, LineBox currentLine, BlockBox box) {
MarkerData markerData = c.getCurrentMarkerData();
c.setCurrentMarkerData(null);
if (box.getStyle().isFixed()) {
box.setContainingBlock(c.getRootLayer().getMaster().getContainingBlock());
} else {
box.setContainingBlock(c.getLayer().getMaster());
}
box.setStaticEquivalent(currentLine);
// If printing, don't layout until we know where its going
if (! c.isPrint()) {
box.layout(c);
} else {
c.pushLayer(box);
c.getLayer().setRequiresLayout(true);
c.popLayer();
}
c.setCurrentMarkerData(markerData);
}
public static FloatLayoutResult layoutFloated(
final LayoutContext c, LineBox currentLine, BlockBox block,
int avail, List pendingFloats) {
FloatLayoutResult result = new FloatLayoutResult();
MarkerData markerData = c.getCurrentMarkerData();
c.setCurrentMarkerData(null);
block.setContainingBlock(currentLine.getParent());
block.setContainingLayer(currentLine.getContainingLayer());
block.setStaticEquivalent(currentLine);
if (pendingFloats != null) {
block.setY(currentLine.getY() + block.getFloatedBoxData().getMarginFromSibling());
} else {
block.setY(currentLine.getY() + currentLine.getHeight());
}
block.calcInitialFloatedCanvasLocation(c);
int initialY = block.getY();
block.layout(c);
c.getBlockFormattingContext().floatBox(c, block);
if (pendingFloats != null &&
(pendingFloats.size() > 0 || block.getWidth() > avail) &&
currentLine.isContainsContent()) {
block.reset(c);
result.setPending(true);
} else {
if (c.isPrint()) {
positionFloatOnPage(c, currentLine, block, initialY != block.getY());
c.getRootLayer().ensureHasPage(c, block);
}
}
result.setBlock(block);
c.setCurrentMarkerData(markerData);
return result;
}
private static void positionFloatOnPage(
final LayoutContext c, LineBox currentLine, BlockBox block,
boolean movedVertically) {
boolean clearedPage = false;
int clearDelta = 0;
if (block.getStyle().isForcePageBreakBefore() ||
(block.getStyle().isAvoidPageBreakInside() &&
block.crossesPageBreak(c))) {
clearDelta = block.forcePageBreakBefore(c, block.getStyle().getIdent(CSSName.PAGE_BREAK_BEFORE), false);
clearedPage = true;
block.calcCanvasLocation();
block.reset(c);
block.setContainingLayer(currentLine.getContainingLayer());
block.layout(c);
c.getBlockFormattingContext().floatBox(c, block);
}
if ((movedVertically ||
(block.getStyle().isAvoidPageBreakInside() && block.crossesPageBreak(c))) &&
! block.getStyle().isForcePageBreakBefore()) {
if (clearedPage) {
block.setY(block.getY() - clearDelta);
block.calcCanvasLocation();
}
block.reset(c);
block.setContainingLayer(currentLine.getContainingLayer());
block.layout(c);
c.getBlockFormattingContext().floatBox(c, block);
}
}
}