com.itextpdf.layout.renderer.BlockFormattingContextUtil Maven / Gradle / Ivy
/*
This file is part of the iText (R) project.
Copyright (c) 1998-2018 iText Group NV
Authors: iText Software.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License version 3
as published by the Free Software Foundation with the addition of the
following permission added to Section 15 as permitted in Section 7(a):
FOR ANY PART OF THE COVERED WORK IN WHICH THE COPYRIGHT IS OWNED BY
ITEXT GROUP. ITEXT GROUP DISCLAIMS THE WARRANTY OF NON INFRINGEMENT
OF THIRD PARTY RIGHTS
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 Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program; if not, see http://www.gnu.org/licenses or write to
the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA, 02110-1301 USA, or download the license from the following URL:
http://itextpdf.com/terms-of-use/
The interactive user interfaces in modified source and object code versions
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Section 5 of the GNU Affero General Public License.
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a covered work must retain the producer line in every PDF that is created
or manipulated using iText.
You can be released from the requirements of the license by purchasing
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*/
package com.itextpdf.layout.renderer;
import com.itextpdf.io.util.NumberUtil;
import com.itextpdf.layout.layout.LayoutPosition;
import com.itextpdf.layout.property.OverflowPropertyValue;
import com.itextpdf.layout.property.Property;
/**
* This class helps to identify whether we are dealing with a renderer that creates
* a new "Block formatting context" in terms of CSS. Such renderers adhere to
* specific rules of floating elements and margins collapse handling.
*
* See
* https://www.w3.org/TR/CSS21/visuren.html#block-formatting
* and
* https://developer.mozilla.org/en-US/docs/Web/Guide/CSS/Block_formatting_context
* for more info.
*/
public class BlockFormattingContextUtil {
/**
* Defines whether a renderer creates a new "Block formatting context" in terms of CSS.
*
* See {@link BlockFormattingContextUtil} class description for more info.
* @param renderer an {@link IRenderer} to be checked.
* @return true if given renderer creates a new "Block formatting context" in terms of CSS, false otherwise.
*/
public static boolean isRendererCreateBfc(IRenderer renderer) {
return (renderer instanceof RootRenderer)
|| (renderer instanceof CellRenderer)
|| isInlineBlock(renderer)
|| FloatingHelper.isRendererFloating(renderer)
|| isAbsolutePosition(renderer)
|| isFixedPosition(renderer)
|| AbstractRenderer.isOverflowProperty(OverflowPropertyValue.HIDDEN, renderer, Property.OVERFLOW_X)
|| AbstractRenderer.isOverflowProperty(OverflowPropertyValue.HIDDEN, renderer, Property.OVERFLOW_Y);
}
private static boolean isInlineBlock(IRenderer renderer) {
return renderer.getParent() instanceof LineRenderer
&& (renderer instanceof BlockRenderer || renderer instanceof TableRenderer);
}
private static boolean isAbsolutePosition(IRenderer renderer) {
Integer positioning = NumberUtil.asInteger(renderer.