org.jfree.layouting.renderer.process

Class ParagraphLineBreakStep

public class ParagraphLineBreakStep extends IterateStructuralProcessStep

This static computation step performs manual linebreaks on all paragraphs. This transforms the pool-collection into the lines-collection.

For now, we follow a very simple path: A paragraph cannot be validated, if it is not yet closed. The linebreaking, be it the static one here or the dynamic one later, must be redone when the paragraph changes.

Splitting for linebreaks happens only between inline-boxes. BlockBoxes that are contained in inline-boxes (like 'inline-block' elements or 'inline-tables') are considered unbreakable according to the CSS specs. Linebreaking can be suspended in these cases.

As paragraphs itself are block elements, the linebreaks can be done iterative, using a simple stack to store the context of possibly nested paragraphs. The paragraph's pool contains the elements that should be processed, and the line-container will receive the pool's content (contained in an artificial inline element, as the linecontainer is a block-level element).

Change-tracking should take place on the paragraph's pool element instead of the paragraph itself. This way, only structural changes are taken into account.

Author: Thomas Morgner

Constructor Summary
ParagraphLineBreakStep()
Method Summary
voidcompute(LogicalPageBox root)
protected voidfinishBlockBox(BlockRenderBox box)
protected voidfinishInlineBox(InlineRenderBox box)
protected voidfinishOtherBox(RenderBox box)
protected booleanstartBlockBox(BlockRenderBox box)
protected booleanstartInlineBox(InlineRenderBox box)
protected booleanstartOtherBox(RenderBox box)
protected voidstartOtherNode(RenderNode node)

Constructor Detail

ParagraphLineBreakStep

public ParagraphLineBreakStep()

Method Detail

compute

public void compute(LogicalPageBox root)

finishBlockBox

protected void finishBlockBox(BlockRenderBox box)

finishInlineBox

protected void finishInlineBox(InlineRenderBox box)

finishOtherBox

protected void finishOtherBox(RenderBox box)

startBlockBox

protected boolean startBlockBox(BlockRenderBox box)

startInlineBox

protected boolean startInlineBox(InlineRenderBox box)

startOtherBox

protected boolean startOtherBox(RenderBox box)

startOtherNode

protected void startOtherNode(RenderNode node)