Class MarginsCollapseHandler

java.lang.Object

com.itextpdf.layout.margincollapse.MarginsCollapseHandler

public class MarginsCollapseHandler
extends Object

Rules of the margins collapsing are taken from Mozilla Developer Network: https://developer.mozilla.org/en-US/docs/Web/CSS/CSS_Box_Model/Mastering_margin_collapsing See also: https://www.w3.org/TR/CSS2/box.html#collapsing-margins

Field Summary

Fields

Modifier and Type	Field	Description
private MarginsCollapseInfo	backupCollapseInfo
private Rectangle	backupLayoutBox
private MarginsCollapseInfo	childMarginInfo
private MarginsCollapseInfo	collapseInfo
private int	firstNotEmptyKidIndex
private boolean	lastKidCollapsedAfterHasClearanceApplied
private MarginsCollapseInfo	prevChildMarginInfo
private int	processedChildrenNum
private IRenderer	renderer
private List<IRenderer>	rendererChildren

Constructor Summary

Constructors

Constructor	Description
MarginsCollapseHandler(IRenderer renderer, MarginsCollapseInfo marginsCollapseInfo)

Method Summary

Modifier and Type	Method	Description
private void	addNotYetAppliedTopMargin(Rectangle layoutBox)
private void	applyBottomMargin(Rectangle box, float bottomIndent)
void	applyClearance(float clearHeightCorrection)
private void	applySelfCollapsedKidMarginWithClearance(Rectangle layoutBox)
private void	applyTopMargin(Rectangle box, float topIndent)
private MarginsCollapseInfo	createMarginsInfoForBlockChild(int childIndex)
private static float	defineBottomMarginValueForCollapse(IRenderer renderer)
private static float	defineMarginValueForCollapse(IRenderer renderer, int property)
private static float	defineTopMarginValueForCollapse(IRenderer renderer)
void	endChildMarginsHandling(Rectangle layoutBox)	This method shall be called after child occupied area is included into parent occupied area.
void	endMarginsCollapse(Rectangle layoutBox)
private static boolean	firstChildMarginAdjoinedToParent(IRenderer parent)
private void	fixPrevChildOccupiedArea(int childIndex)
private IRenderer	getRendererChild(int index)
private void	getRidOfCollapseArtifactsAtopOccupiedArea()
private static boolean	hasBottomBorders(IRenderer renderer)
private static boolean	hasBottomPadding(IRenderer renderer)
private static boolean	hasHeightProp(IRenderer renderer)
private static boolean	hasPadding(IRenderer renderer, int property)
private static boolean	hasPositiveHeight(IRenderer renderer)
private static boolean	hasTopBorders(IRenderer renderer)
private static boolean	hasTopPadding(IRenderer renderer)
private static void	ignoreModelBottomMargin(IRenderer renderer)
private static void	ignoreModelTopMargin(IRenderer renderer)
private static boolean	isBlockElement(IRenderer renderer)
private static boolean	lastChildMarginAdjoinedToParent(IRenderer parent)
private static boolean	marginsCouldBeSelfCollapsing(IRenderer renderer)
private static void	overrideModelBottomMargin(IRenderer renderer, float collapsedMargins)
private static void	overrideModelMargin(IRenderer renderer, int property, float collapsedMargins)
private static void	overrideModelTopMargin(IRenderer renderer, float collapsedMargins)
private void	prepareBoxForLayoutAttempt(Rectangle layoutBox, int childIndex, boolean childIsBlockElement)
void	processFixedHeightAdjustment(float heightDelta)
private void	processUsedChildBufferSpaceOnTop(Rectangle layoutBox)
private IRenderer	removeRendererChild(int index)
private static boolean	rendererIsFloated(IRenderer renderer)
private void	restoreLayoutBoxAfterFailedLayoutAttempt(Rectangle layoutBox)
MarginsCollapseInfo	startChildMarginsHandling(IRenderer child, Rectangle layoutBox)
void	startMarginsCollapse(Rectangle parentBBox)
private void	subtractUsedTopBufferFromBottomBuffer(float usedTopBuffer)
private void	updateCollapseBeforeIfPrevKidIsFirstAndSelfCollapsed(MarginsCollapse collapseAfter)

Methods inherited from class Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

renderer

private IRenderer renderer

collapseInfo

private MarginsCollapseInfo collapseInfo

childMarginInfo

private MarginsCollapseInfo childMarginInfo

prevChildMarginInfo

private MarginsCollapseInfo prevChildMarginInfo

firstNotEmptyKidIndex

private int firstNotEmptyKidIndex

processedChildrenNum

private int processedChildrenNum

rendererChildren

private List<IRenderer> rendererChildren

backupLayoutBox

private Rectangle backupLayoutBox

backupCollapseInfo

private MarginsCollapseInfo backupCollapseInfo

lastKidCollapsedAfterHasClearanceApplied

private boolean lastKidCollapsedAfterHasClearanceApplied

Constructor Details

MarginsCollapseHandler

public MarginsCollapseHandler(IRenderer renderer,
 MarginsCollapseInfo marginsCollapseInfo)

Method Details

processFixedHeightAdjustment

public void processFixedHeightAdjustment(float heightDelta)

startChildMarginsHandling

public MarginsCollapseInfo startChildMarginsHandling(IRenderer child,
 Rectangle layoutBox)

applyClearance

public void applyClearance(float clearHeightCorrection)

createMarginsInfoForBlockChild

private MarginsCollapseInfo createMarginsInfoForBlockChild(int childIndex)

endChildMarginsHandling

public void endChildMarginsHandling(Rectangle layoutBox)

This method shall be called after child occupied area is included into parent occupied area.

Parameters:

layoutBox - available area for child and its siblings layout. It might be adjusted inside the method

startMarginsCollapse

public void startMarginsCollapse(Rectangle parentBBox)

endMarginsCollapse

public void endMarginsCollapse(Rectangle layoutBox)

updateCollapseBeforeIfPrevKidIsFirstAndSelfCollapsed

private void updateCollapseBeforeIfPrevKidIsFirstAndSelfCollapsed(MarginsCollapse collapseAfter)

prepareBoxForLayoutAttempt

private void prepareBoxForLayoutAttempt(Rectangle layoutBox,
 int childIndex,
 boolean childIsBlockElement)

restoreLayoutBoxAfterFailedLayoutAttempt

private void restoreLayoutBoxAfterFailedLayoutAttempt(Rectangle layoutBox)

applyTopMargin

private void applyTopMargin(Rectangle box,
 float topIndent)

applyBottomMargin

private void applyBottomMargin(Rectangle box,
 float bottomIndent)

processUsedChildBufferSpaceOnTop

private void processUsedChildBufferSpaceOnTop(Rectangle layoutBox)

subtractUsedTopBufferFromBottomBuffer

private void subtractUsedTopBufferFromBottomBuffer(float usedTopBuffer)

fixPrevChildOccupiedArea

private void fixPrevChildOccupiedArea(int childIndex)

addNotYetAppliedTopMargin

private void addNotYetAppliedTopMargin(Rectangle layoutBox)

applySelfCollapsedKidMarginWithClearance

private void applySelfCollapsedKidMarginWithClearance(Rectangle layoutBox)

getRendererChild

private IRenderer getRendererChild(int index)

removeRendererChild

private IRenderer removeRendererChild(int index)

getRidOfCollapseArtifactsAtopOccupiedArea

private void getRidOfCollapseArtifactsAtopOccupiedArea()

marginsCouldBeSelfCollapsing

private static boolean marginsCouldBeSelfCollapsing(IRenderer renderer)

firstChildMarginAdjoinedToParent

private static boolean firstChildMarginAdjoinedToParent(IRenderer parent)

lastChildMarginAdjoinedToParent

private static boolean lastChildMarginAdjoinedToParent(IRenderer parent)

isBlockElement

private static boolean isBlockElement(IRenderer renderer)

hasHeightProp

private static boolean hasHeightProp(IRenderer renderer)

hasPositiveHeight

private static boolean hasPositiveHeight(IRenderer renderer)

hasTopPadding

private static boolean hasTopPadding(IRenderer renderer)

hasBottomPadding

private static boolean hasBottomPadding(IRenderer renderer)

hasTopBorders

private static boolean hasTopBorders(IRenderer renderer)

hasBottomBorders

private static boolean hasBottomBorders(IRenderer renderer)

rendererIsFloated

private static boolean rendererIsFloated(IRenderer renderer)

defineTopMarginValueForCollapse

private static float defineTopMarginValueForCollapse(IRenderer renderer)

ignoreModelTopMargin

private static void ignoreModelTopMargin(IRenderer renderer)

overrideModelTopMargin

private static void overrideModelTopMargin(IRenderer renderer,
 float collapsedMargins)

defineBottomMarginValueForCollapse

private static float defineBottomMarginValueForCollapse(IRenderer renderer)

ignoreModelBottomMargin

private static void ignoreModelBottomMargin(IRenderer renderer)

overrideModelBottomMargin

private static void overrideModelBottomMargin(IRenderer renderer,
 float collapsedMargins)

defineMarginValueForCollapse

private static float defineMarginValueForCollapse(IRenderer renderer,
 int property)

overrideModelMargin

private static void overrideModelMargin(IRenderer renderer,
 int property,
 float collapsedMargins)

hasPadding

private static boolean hasPadding(IRenderer renderer,
 int property)