Public Types | Public Member Functions

gfxTextRun::PropertyProvider Class Reference

Layout provides PropertyProvider objects. More...

#include <gfxFont.h>

List of all members.

Public Types

typedef gfxFont::Spacing Spacing

Public Member Functions

virtual void GetHyphenationBreaks (PRUint32 aStart, PRUint32 aLength, PRPackedBool *aBreakBefore)=0
virtual gfxFloat GetHyphenWidth ()=0
virtual void GetSpacing (PRUint32 aStart, PRUint32 aLength, Spacing *aSpacing)=0
 Get the spacing around the indicated characters.

Detailed Description

Layout provides PropertyProvider objects.

These allow detection of potential line break points and computation of spacing. We pass the data this way to allow lazy data acquisition; for example BreakAndMeasureText will want to only ask for properties of text it's actually looking at.

NOTE that requested spacing may not actually be applied, if the textrun is unable to apply it in some context. Exception: spacing around a whitespace character MUST always be applied.


Member Typedef Documentation


Member Function Documentation

virtual void gfxTextRun::PropertyProvider::GetHyphenationBreaks ( PRUint32  aStart,
PRUint32  aLength,
PRPackedBool aBreakBefore 
) [pure virtual]
virtual gfxFloat gfxTextRun::PropertyProvider::GetHyphenWidth (  )  [pure virtual]
virtual void gfxTextRun::PropertyProvider::GetSpacing ( PRUint32  aStart,
PRUint32  aLength,
Spacing aSpacing 
) [pure virtual]

Get the spacing around the indicated characters.

Spacing must be zero inside clusters. In other words, if character i is not CLUSTER_START, then character i-1 must have zero after-spacing and character i must have zero before-spacing.


The documentation for this class was generated from the following file: