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libs-gui/Headers/Additions/GNUstepGUI/GSLayoutManager.h
Eric Wasylishen 5d897881e4 * Source/GSLayoutManager.m: 
* Source/GSHorizontalTypesetter.m:
* Headers/Additions/GNUstepGUI/GSLayoutManager_internal.h:
* Headers/Additions/GNUstepGUI/GSLayoutManager.h: Store
glyph advances in the runs in GSLayoutManager. Extend the
NSGlyphStorage protocol to support a case where the glyph
generator provides the glyph advances.

I'm hoping to use this in the future to implement (optional)
glyph generators which are wrappers around HarfBuzz or the ICU
OpenType layout engine.


git-svn-id: svn+ssh://svn.gna.org/svn/gnustep/libs/gui/trunk@33684 72102866-910b-0410-8b05-ffd578937521
2011-08-02 23:34:06 +00:00

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/*
GSLayoutManager.h
Copyright (C) 2002, 2003 Free Software Foundation, Inc.
Author: Alexander Malmberg <alexander@malmberg.org>
Date: November 2002 - February 2003
This file is part of the GNUstep GUI Library.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; see the file COPYING.LIB.
If not, see <http://www.gnu.org/licenses/> or write to the
Free Software Foundation, 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA.
*/
#ifndef _GNUstep_H_GSLayoutManager
#define _GNUstep_H_GSLayoutManager
#import <Foundation/NSObject.h>
#import <Foundation/NSGeometry.h>
#import <AppKit/NSFont.h>
#import <AppKit/NSGlyphGenerator.h>
@class GSTypesetter;
@class NSTextStorage,NSTextContainer;
typedef enum
{
NSGlyphInscribeBase = 0,
NSGlyphInscribeBelow = 1,
NSGlyphInscribeAbove = 2,
NSGlyphInscribeOverstrike = 3,
NSGlyphInscribeOverBelow = 4
} NSGlyphInscription;
enum {
NSGlyphAttributeSoft = 0,
NSGlyphAttributeElastic = 1,
#if OS_API_VERSION(MAC_OS_X_VERSION_10_2, GS_API_LATEST)
NSGlyphAttributeBidiLevel = 2,
#endif
NSGlyphAttributeInscribe = 5
};
#if OS_API_VERSION(MAC_OS_X_VERSION_10_3, GS_API_LATEST)
@interface GSLayoutManager : NSObject <NSGlyphStorage, NSCoding>
#else
@interface GSLayoutManager : NSObject
#endif
{
@protected
NSTextStorage *_textStorage;
NSGlyphGenerator *_glyphGenerator;
id _delegate;
BOOL usesScreenFonts;
BOOL backgroundLayoutEnabled;
BOOL showsInvisibleCharacters;
BOOL showsControlCharacters;
GSTypesetter *typesetter;
/* Glyph storage */
/* Skip list of runs */
struct GSLayoutManager_glyph_run_head_s *glyphs;
/* number of runs created from existing text (ie. not as a result of
stuff being invalidated) */
int glyph_num_end_runs;
/* Layout storage */
/* OPT: This is just a simple implementation that should let me figure out
how it's supposed to work. It's functional and correct, but it isn't fast. */
unsigned int layout_glyph, layout_char;
struct GSLayoutManager_textcontainer_s *textcontainers;
int num_textcontainers;
NSRect extra_rect, extra_used_rect;
NSTextContainer *extra_textcontainer;
/* For -rectArrayForGlyphRange:... */
NSRect *rect_array;
int rect_array_size;
/*
Cached run. GSHorizontalTypesetter (and other typesetters, presumably)
often walk linearly through the glyphs. Thus, for many methods, we cache
the last run so we can quickly get more information for the next glyph.
*/
struct GSLayoutManager_glyph_run_s *cached_run;
unsigned int cached_pos, cached_cpos;
}
- (NSTextStorage *) textStorage;
- (void) setTextStorage: (NSTextStorage *)aTextStorage;
- (void) replaceTextStorage: (NSTextStorage *)newTextStorage;
- (NSGlyphGenerator *) glyphGenerator;
- (void) setGlyphGenerator: (NSGlyphGenerator *)glyphGenerator;
- (id) delegate;
- (void) setDelegate: (id)aDelegate;
-(GSTypesetter *) typesetter;
-(void) setTypesetter: (GSTypesetter *)typesetter;
- (void) setBackgroundLayoutEnabled: (BOOL)flag;
- (BOOL) backgroundLayoutEnabled;
- (void) setShowsInvisibleCharacters: (BOOL)flag;
- (BOOL) showsInvisibleCharacters;
- (void) setShowsControlCharacters: (BOOL)flag;
- (BOOL) showsControlCharacters;
/** Font handling **/
- (BOOL) usesScreenFonts;
- (void) setUsesScreenFonts: (BOOL)flag;
- (NSFont *) substituteFontForFont: (NSFont *)originalFont;
/*
(?)
Sent by the NSTextStorage. mask tells us if attributes or characters (or
both) have been changed. range is the range of directly modified
characters. invalidatedRange is the range of characters affected by the
changes (contains range but may be larger due to eg. attribute fixing).
If characters have been edited, lengthChange has the text length delta.
*/
- (void) textStorage: (NSTextStorage *)aTextStorage
edited: (unsigned int)mask
range: (NSRange)range
changeInLength: (int)lengthChange
invalidatedRange: (NSRange)invalidatedRange;
/**
* GNUstep extension
*/
- (void) insertGlyphs: (const NSGlyph*)glyph_list
withAdvancements: (const NSSize*)advancements
length: (NSUInteger)length
forStartingGlyphAtIndex: (NSUInteger)glyph
characterIndex: (NSUInteger)index;
@end
@interface GSLayoutManager (glyphs)
/** Glyph handling **/
/*
Mark the glyphs for the characters in aRange as invalid. lengthChange
is the text length delta. If not NULL, the range of characters actually
affected (_after_ the change) will be returned in actualRange.
This method is used internally and should _not_ be called. (It interacts
in complex ways with layout invalidation.)
*/
- (void) invalidateGlyphsForCharacterRange: (NSRange)aRange
changeInLength: (int)lengthChange
actualCharacterRange: (NSRange *)actualRange;
/*
These are internal methods and should _not_ be called.
*/
- (void) insertGlyph: (NSGlyph)aGlyph
atGlyphIndex: (unsigned int)glyphIndex
characterIndex: (unsigned int)charIndex;
- (void) replaceGlyphAtIndex: (unsigned int)glyphIndex
withGlyph: (NSGlyph)newGlyph;
- (void) deleteGlyphsInRange: (NSRange)aRange;
- (void) setCharacterIndex: (unsigned int)charIndex
forGlyphAtIndex: (unsigned int)glyphIndex;
/* Returns total number of glyphs. */
- (unsigned int) numberOfGlyphs;
/* Returns the glyph at glyphIndex or raises an NSRangeException if the
index is invalid (past the end of the glyphs). */
- (NSGlyph) glyphAtIndex: (unsigned int)glyphIndex;
/* Returns the glyph at glyphIndex and sets isValidIndex to YES if the index
is valid. Otherwise, the return value is arbitrary and isValidIndex is set
to NO. */
- (NSGlyph) glyphAtIndex: (unsigned int)glyphIndex
isValidIndex: (BOOL *)isValidIndex;
/* Returns if the glyph at glyphIndex is valid or not */
- (BOOL) isValidGlyphIndex: (unsigned int)glyphIndex;
/* Copies displayed glyphs to glyphArray for glyphRange. Returns the number
of glyphs actually copied to the array. NSRangeException of the range is
invalid (extends beyond the end of glyphs). */
- (unsigned int) getGlyphs: (NSGlyph *)glyphArray
range: (NSRange)glyphRange;
/* Return the first character for the glyph at glyphIndex.
(NSRangeException?) */
- (unsigned int) characterIndexForGlyphAtIndex: (unsigned int)glyphIndex;
/**
* GNUstep extension
*/
- (NSSize) advancementForGlyphAtIndex: (unsigned int)glyphIndex;
/* Returns the range of glyphs for the characters in charRange. If
actualRange isn't NULL, the exact range of characters for the glyphs in the
returned range is returned there. */
- (NSRange) glyphRangeForCharacterRange: (NSRange)charRange
actualCharacterRange: (NSRange *)actualCharRange;
/* Returns the range of characters for the glyphs in glyphRange. Returns
the actual glyphs for the characters in the range in actualGlyphRange, if
it isn't NULL. */
- (NSRange) characterRangeForGlyphRange: (NSRange)glyphRange
actualGlyphRange: (NSRange *)actualGlyphRange;
/* These can be used to set arbitrary tags on individual glyphs.
Non-negative tags are reserved. You must provide storage yourself (by
subclassing). */
#if !OS_API_VERSION(MAC_OS_X_VERSION_10_3, GS_API_LATEST)
- (void) setIntAttribute: (int)attributeTag
value: (int)anInt
forGlyphAtIndex: (unsigned int)glyphIndex;
#endif
- (int) intAttribute: (int)attributeTag
forGlyphAtIndex: (unsigned int)glyphIndex;
/* Returns the font actually used for a range of glyphs. This isn't
necessarily the font specified by NSFontAttributeName; both the typesetter
and the layout manager can substitute a different font (the typesetter might
eg. substitute a smaller font for sub-/super-scripted text, and the layout
manager might be substituting screen fonts. */
- (NSFont *) effectiveFontForGlyphAtIndex: (unsigned int)glyphIndex
range: (NSRange *)range; /* GNUstep extension */
- (void) setDrawsOutsideLineFragment: (BOOL)flag
forGlyphAtIndex: (unsigned int)glyphIndex;
- (BOOL) drawsOutsideLineFragmentForGlyphAtIndex: (unsigned int) glyphIndex;
- (void) setNotShownAttribute: (BOOL)flag
forGlyphAtIndex: (unsigned int)glyphIndex;
- (BOOL) notShownAttributeForGlyphAtIndex: (unsigned int) glyphIndex;
@end
@interface GSLayoutManager (layout)
/** Text containers **/
- (NSArray *) textContainers;
- (void) addTextContainer: (NSTextContainer *)container;
- (void) insertTextContainer: (NSTextContainer*)aTextContainer
atIndex: (unsigned int)index;
- (void) removeTextContainerAtIndex: (unsigned int)index;
- (void) textContainerChangedGeometry: (NSTextContainer *)aContainer;
/** Layout **/
/*
This method is used internally and should _not_ be called. (It interacts
in complex ways with glyph invalidation, and with itself when doing soft
invalidation.)
*/
- (void) invalidateLayoutForCharacterRange: (NSRange)aRange
isSoft: (BOOL)flag
actualCharacterRange: (NSRange *)actualRange;
- (void) setTextContainer: (NSTextContainer *)aTextContainer
forGlyphRange: (NSRange)glyphRange;
- (void) setLineFragmentRect: (NSRect)fragmentRect
forGlyphRange: (NSRange)glyphRange
usedRect: (NSRect)usedRect;
- (void) setLocation: (NSPoint)location
forStartOfGlyphRange: (NSRange)glyphRange;
- (void) setAttachmentSize: (NSSize)attachmentSize
forGlyphRange: (NSRange)glyphRange; /* not OPENSTEP */
- (NSTextContainer *) textContainerForGlyphAtIndex: (NSUInteger)glyphIndex
effectiveRange: (NSRange *)effectiveRange;
- (NSRect) lineFragmentRectForGlyphAtIndex: (NSUInteger)glyphIndex
effectiveRange: (NSRange *)effectiveGlyphRange;
- (NSRect) lineFragmentUsedRectForGlyphAtIndex: (NSUInteger)glyphIndex
effectiveRange: (NSRange *)effectiveGlyphRange;
#if OS_API_VERSION(MAC_OS_X_VERSION_10_5, GS_API_LATEST)
- (NSTextContainer *) textContainerForGlyphAtIndex: (NSUInteger)glyphIndex
effectiveRange: (NSRange *)effectiveRange
withoutAdditionalLayout: (BOOL)flag;
- (NSRect) lineFragmentRectForGlyphAtIndex: (NSUInteger)glyphIndex
effectiveRange: (NSRange *)effectiveGlyphRange
withoutAdditionalLayout: (BOOL)flag;
- (NSRect) lineFragmentUsedRectForGlyphAtIndex: (NSUInteger)glyphIndex
effectiveRange: (NSRange *)effectiveGlyphRange
withoutAdditionalLayout: (BOOL)flag;
#endif
/*
The typesetter may set this to mark where the rectangle the insertion point
is to be placed if the insertion point is beyond the last character of the
text. The extra text container is reset to nil any time layout is
invalidated.
*/
-(void) setExtraLineFragmentRect: (NSRect)linefrag
usedRect: (NSRect)used
textContainer: (NSTextContainer *)tc;
-(NSRect) extraLineFragmentRect;
-(NSRect) extraLineFragmentUsedRect;
-(NSTextContainer *) extraLineFragmentTextContainer;
/* Extension, but without this, there's no way to get the starting locations
of the nominally spaced glyphs. */
- (NSRange) rangeOfNominallySpacedGlyphsContainingIndex:(unsigned int)glyphIndex
startLocation: (NSPoint *)p;
- (NSRange) rangeOfNominallySpacedGlyphsContainingIndex:(unsigned int)glyphIndex;
/* The union of all line frag rects' used rects. (TODO: shouldn't this be
just the union of all the line frag rects?) */
- (NSRect) usedRectForTextContainer: (NSTextContainer *)container;
- (NSRange) glyphRangeForTextContainer: (NSTextContainer *)container;
- (unsigned int) firstUnlaidCharacterIndex;
- (unsigned int) firstUnlaidGlyphIndex;
- (void) getFirstUnlaidCharacterIndex: (unsigned int *)charIndex
glyphIndex: (unsigned int *)glyphIndex;
/*
Basic (and experimental) methods that let the typesetter use soft-invalidated
layout information.
*/
-(void) _softInvalidateUseLineFrags: (int)num
withShift: (NSSize)shift
inTextContainer: (NSTextContainer *)textContainer;
-(NSRect) _softInvalidateLineFragRect: (int)index
firstGlyph: (unsigned int *)first_glyph
nextGlyph: (unsigned int *)next_glyph
inTextContainer: (NSTextContainer *)textContainer;
-(unsigned int) _softInvalidateFirstGlyphInTextContainer: (NSTextContainer *)textContainer;
-(unsigned int) _softInvalidateNumberOfLineFragsInTextContainer: (NSTextContainer *)textContainer;
@end
@interface NSObject (GSLayoutManagerDelegate)
-(void) layoutManager: (GSLayoutManager *)layoutManager
didCompleteLayoutForTextContainer: (NSTextContainer *)textContainer
atEnd: (BOOL)atEnd;
@end
#endif
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