com.itextpdf.layout.renderer.BlockFormattingContextUtil Maven / Gradle / Ivy
/*
This file is part of the iText (R) project.
Copyright (c) 1998-2020 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
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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.
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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
* @see https://developer.mozilla.org/en-US/docs/Web/Guide/CSS/Block_formatting_context
*/
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)
|| isCaption(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.