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515 lines
17 KiB
Plaintext
515 lines
17 KiB
Plaintext
/*
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* CPTypesetter.j
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* AppKit
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*
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* Created by Daniel Boehringer on 27/12/2013.
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* All modifications copyright Daniel Boehringer 2013.
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* Extensive code formatting and review by Andrew Hankinson
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* Based on original work by
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* Emmanuel Maillard on 27/02/2010.
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* Copyright Emmanuel Maillard 2010.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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@import <Foundation/CPObject.j>
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@import "CPParagraphStyle.j"
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@import "CPTextStorage.j"
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@import "CPFont.j"
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// forward declare these classes for type matching
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@class CPLayoutManager
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@class CPTextContainer
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@class CPTextView
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/*
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CPTypesetterControlCharacterAction
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*/
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CPTypesetterZeroAdvancementAction = 1 << 0;
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CPTypesetterWhitespaceAction = 1 << 1;
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CPSTypesetterHorizontalTabAction = 1 << 2;
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CPTypesetterLineBreakAction = 1 << 3;
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CPTypesetterParagraphBreakAction = 1 << 4;
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CPTypesetterContainerBreakAction = 1 << 5;
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var CPSystemTypesetterFactory,
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_sharedSimpleTypesetter;
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@implementation CPTypesetter : CPObject
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#pragma mark -
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#pragma mark Class methods
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+ (void)initialize
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{
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[CPTypesetter _setSystemTypesetterFactory:[CPSimpleTypesetter class]];
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}
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+ (id)sharedSystemTypesetter
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{
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return [CPSystemTypesetterFactory sharedInstance];
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}
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+ (void)_setSystemTypesetterFactory:(Class)aClass
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{
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CPSystemTypesetterFactory = aClass;
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}
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- (CPTypesetterControlCharacterAction)actionForControlCharacterAtIndex:(unsigned)charIndex
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{
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return CPTypesetterZeroAdvancementAction;
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}
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- (CPLayoutManager)layoutManager
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{
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return nil;
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}
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- (CPTextContainer)currentTextContainer
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{
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return nil;
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}
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- (CPArray)textContainers
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{
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return nil;
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}
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- (void)layoutGlyphsInLayoutManager:(CPLayoutManager)layoutManager
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startingAtGlyphIndex:(unsigned)startGlyphIndex
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maxNumberOfLineFragments:(unsigned)maxNumLines
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nextGlyphIndex:(UIntegerReference)nextGlyph
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{
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_CPRaiseInvalidAbstractInvocation(self, _cmd);
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}
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@end
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@implementation CPSimpleTypesetter : CPTypesetter
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{
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CPLayoutManager _layoutManager @accessors(property=layoutManager);
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CPTextContainer _currentTextContainer @accessors(property=currentTextContainer);
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CPTextStorage _textStorage;
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CPRange _attributesRange;
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CPDictionary _currentAttributes;
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CPParagraphStyle _currentParagraph;
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float _lineHeight;
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float _lineBase;
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float _lineWidth;
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unsigned _indexOfCurrentContainer;
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CPArray _lineFragments;
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}
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#pragma mark -
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#pragma mark Class methods
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+ (id)sharedInstance
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{
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if (!_sharedSimpleTypesetter)
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_sharedSimpleTypesetter = [[CPSimpleTypesetter alloc] init];
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return _sharedSimpleTypesetter;
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}
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- (CPArray)textContainers
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{
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return [_layoutManager textContainers];
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}
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// Retrieves correct CPTextTab stop accounting for CPArray properties
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- (CPTextTab)textTabForWidth:(double)aWidth writingDirection:(CPWritingDirection)direction
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{
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var tabStops = [_currentParagraph tabStops];
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if (!tabStops)
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tabStops = [[CPParagraphStyle defaultParagraphStyle] tabStops];
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var l = [tabStops count];
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if (l === 0)
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return nil;
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var lastTab = [tabStops lastObject];
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if (aWidth > [lastTab location])
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return nil;
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for (var i = l - 1; i >= 0; i--)
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{
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var tab = [tabStops objectAtIndex:i];
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if (aWidth > [tab location])
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{
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if (i + 1 < l)
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return [tabStops objectAtIndex:i + 1];
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}
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}
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if (i === -1)
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return [tabStops objectAtIndex:0];
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return nil;
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}
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- (BOOL)_flushRange:(CPRange)lineRange
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lineOrigin:(CGPoint)lineOrigin
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currentContainer:(CPTextContainer)aContainer
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advancements:(CPArray)advancements
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lineCount:(unsigned)lineCount
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sameLine:(BOOL)sameLine
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{
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var myX = 0,
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rect = CGRectMake(lineOrigin.x, lineOrigin.y, _lineWidth, _lineHeight),
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containerSize = aContainer._size;
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[_layoutManager _appendNewLineFragmentInTextContainer:_currentTextContainer forGlyphRange:lineRange];
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var fragment = [_layoutManager._lineFragments lastObject];
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fragment._isLast = !sameLine;
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_lineFragments.push(fragment);
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[_layoutManager setLineFragmentRect:rect forGlyphRange:lineRange usedRect:rect];
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switch ([_currentParagraph alignment])
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{
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case CPLeftTextAlignment:
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myX = 0;
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break;
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case CPCenterTextAlignment:
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myX = (containerSize.width - _lineWidth) / 2;
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break;
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case CPRightTextAlignment:
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myX = containerSize.width - _lineWidth;
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break;
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}
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[_layoutManager setLocation:CGPointMake(myX, _lineBase) forStartOfGlyphRange:lineRange];
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[_layoutManager _setAdvancements:advancements forGlyphRange:lineRange];
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//fix the _lineFragments when fontsizes differ
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var l = _lineFragments.length;
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for (var i = 0 ; i < l ; i++)
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[_lineFragments[i] _adjustForHeight:_lineHeight];
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if (!lineCount) // do not rescue on first line
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return NO;
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if (aContainer._inResizing)
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return NO;
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return ([_layoutManager _rescuingInvalidFragmentsWasPossibleForGlyphRange:lineRange]);
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}
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- (void)layoutGlyphsInLayoutManager:(CPLayoutManager)layoutManager
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startingAtGlyphIndex:(unsigned)glyphIndex
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maxNumberOfLineFragments:(unsigned)maxNumLines
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nextGlyphIndex:(UIntegerReference)nextGlyph
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{
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var textContainers = [layoutManager textContainers],
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textContainersCount = [textContainers count];
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_layoutManager = layoutManager;
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_textStorage = [_layoutManager textStorage];
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_indexOfCurrentContainer = MAX(0, [textContainers
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indexOfObject:[_layoutManager textContainerForGlyphAtIndex:glyphIndex effectiveRange:nil withoutAdditionalLayout:YES]
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inRange:CPMakeRange(0, textContainersCount)]);
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_currentTextContainer = textContainers[_indexOfCurrentContainer];
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_attributesRange = CPMakeRange(0, 0);
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_lineHeight = 0;
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_lineBase = 0;
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_lineWidth = 0;
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var containerSize = [_currentTextContainer containerSize],
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containerSizeWidth = containerSize.width,
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containerSizeHeight = containerSize.height,
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lineRange = CPMakeRange(glyphIndex, 0),
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wrapRange = CPMakeRange(0, 0),
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wrapWidth = 0,
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isNewline = NO,
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isTabStop = NO,
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isAttachment = NO,
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isWordWrapped = NO,
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numberOfGlyphs= [_textStorage length],
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leading,
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numLines = 0,
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theString = [_textStorage string],
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lineOrigin,
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ascent,
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descent,
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advancements = [],
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prevRangeWidth = 0,
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measuringRange = CPMakeRange(glyphIndex, 0),
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currentAnchor = 0,
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currentFont,
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currentFontLineHeight,
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previousFont,
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currentParagraphMinimumLineHeight,
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currentParagraphMaximumLineHeight,
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currentParagraphLineSpacing;
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if (glyphIndex > 0)
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lineOrigin = CGPointCreateCopy([_layoutManager lineFragmentRectForGlyphAtIndex:glyphIndex effectiveRange:nil].origin);
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else if ([_layoutManager extraLineFragmentTextContainer])
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lineOrigin = CGPointMake(0, [_layoutManager extraLineFragmentUsedRect].origin.y);
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else
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lineOrigin = CGPointMake(0, 0);
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[_layoutManager _removeInvalidLineFragments];
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if (![_textStorage length])
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return;
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_lineFragments = [];
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for (; numLines != maxNumLines && glyphIndex < numberOfGlyphs; glyphIndex++)
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{
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// check whether there any change in the attributes from here on
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if (!CPLocationInRange(glyphIndex, _attributesRange))
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{
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_currentAttributes = [_textStorage attributesAtIndex:glyphIndex effectiveRange:_attributesRange];
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currentFont = [_currentAttributes objectForKey:CPFontAttributeName];
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_currentParagraph = [_currentAttributes objectForKey:CPParagraphStyleAttributeName] || [CPParagraphStyle defaultParagraphStyle];
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currentParagraphMinimumLineHeight = [_currentParagraph minimumLineHeight];
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currentParagraphMaximumLineHeight = [_currentParagraph maximumLineHeight];
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currentParagraphLineSpacing = [_currentParagraph lineSpacing];
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if (!currentFont)
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currentFont = [_textStorage font] || [CPFont systemFontOfSize:12.0];
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ascent = [currentFont ascender];
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descent = [currentFont descender];
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leading = (ascent - descent) * 0.2; // FAKE leading
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currentFontLineHeight = ascent - descent + leading;
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if (previousFont !== currentFont)
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{
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measuringRange = CPMakeRange(glyphIndex, 0);
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currentAnchor = prevRangeWidth;
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previousFont = currentFont;
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}
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}
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if (currentFontLineHeight > _lineHeight)
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_lineHeight = currentFontLineHeight;
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if (ascent > _lineBase)
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_lineBase = ascent;
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lineRange.length++;
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measuringRange.length++;
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var currentCharCode = theString.charCodeAt(glyphIndex), // use pure javascript methods for performance reasons
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rangeWidth = [theString.substr(measuringRange.location, measuringRange.length) sizeWithFont:currentFont inWidth:NULL].width + currentAnchor;
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switch (currentCharCode) // faster than sending actionForControlCharacterAtIndex: called for each char.
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{
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case CPAttachmentCharacter:
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{
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var attributes = [_textStorage attributesAtIndex:glyphIndex effectiveRange:nil],
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view = [attributes objectForKey:_CPAttachmentView],
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viewSize = view ? view._frame.size : CGSizeMake(0, 0);
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rangeWidth = prevRangeWidth + viewSize.width; // undo sizing of dummy character
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isAttachment = YES;
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wrapRange = CPMakeRange(lineRange.location, lineRange.length - 1); // wrap before image
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// prevent crash when image is larger than text container
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if (viewSize.width > containerSizeWidth)
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wrapRange.length++;
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wrapWidth = rangeWidth;
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wrapRange._height = _lineHeight;
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wrapRange._base = _lineBase;
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if (viewSize.height > _lineBase)
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_lineBase = viewSize.height;
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if (viewSize.height > _lineHeight)
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_lineHeight = viewSize.height - descent + leading;
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ascent = viewSize.height;
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break;
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}
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case 9: // '\t'
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{
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var nextTab = [self textTabForWidth:rangeWidth + lineOrigin.x writingDirection:0];
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isTabStop = YES;
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if (nextTab)
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{
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// Look-ahead to measure the width of the incoming text segment for alignment
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var nextSegmentWidth = 0.0,
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tempIndex = glyphIndex + 1,
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segmentString = "";
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while (tempIndex < numberOfGlyphs)
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{
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var nextCharCode = theString.charCodeAt(tempIndex);
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if (nextCharCode === 9 || nextCharCode === 10 || nextCharCode === 13)
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break;
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segmentString += theString.charAt(tempIndex);
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tempIndex++;
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}
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if (segmentString.length > 0)
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nextSegmentWidth = [segmentString sizeWithFont:currentFont inWidth:NULL].width;
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var tabLocation = [nextTab location],
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tabAlignment = [nextTab alignment];
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// Mathematically offset the tab character's right boundary
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if (tabAlignment === CPCenterTextAlignment)
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{
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rangeWidth = (tabLocation - nextSegmentWidth / 2.0) - lineOrigin.x;
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}
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else if (tabAlignment === CPRightTextAlignment)
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{
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rangeWidth = (tabLocation - nextSegmentWidth) - lineOrigin.x;
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}
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else // Left align tab stop
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{
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rangeWidth = tabLocation - lineOrigin.x;
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}
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// Enforce a minimum safety spacer width to avoid character overlapping
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var minRangeWidth = prevRangeWidth + 5.0;
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if (rangeWidth < minRangeWidth)
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rangeWidth = minRangeWidth;
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}
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else
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{
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rangeWidth += 28.0; // standard fallback spacer
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}
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} // fallthrough intentional
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case 32: // ' '
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wrapRange = CPMakeRangeCopy(lineRange);
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wrapWidth = rangeWidth;
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wrapRange._height = _lineHeight;
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wrapRange._base = _lineBase;
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// Optimization: Start measuring from the next character to avoid O(n^2)
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// string width calculation within a line since spaces do not carry ligatures or kerning.
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// Only reset the measuring range if the next character is NOT another space.
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// This prevents compounded subpixel rounding errors with contiguous spaces.
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if (theString.charCodeAt(glyphIndex + 1) !== 32)
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{
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currentAnchor = rangeWidth;
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measuringRange = CPMakeRange(glyphIndex + 1, 0);
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}
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break;
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case 10:
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case 13:
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isNewline = YES;
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}
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advancements.push({width: rangeWidth - prevRangeWidth, height: ascent, descent: descent});
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prevRangeWidth = _lineWidth = rangeWidth;
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if (lineOrigin.x + rangeWidth > containerSizeWidth)
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{
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if (wrapWidth)
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{
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lineRange = wrapRange;
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_lineWidth = wrapWidth;
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_lineHeight = wrapRange._height;
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_lineBase = wrapRange._base;
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}
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isNewline = YES;
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isWordWrapped = YES;
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glyphIndex = CPMaxRange(lineRange) - 1; // start the line starts directly at current character
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}
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if (isNewline || isTabStop || isAttachment)
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{
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if ([self _flushRange:lineRange lineOrigin:lineOrigin currentContainer:_currentTextContainer advancements:advancements lineCount:numLines sameLine:!isNewline])
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return;
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if (isTabStop || isAttachment)
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lineOrigin.x += rangeWidth;
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if (isNewline)
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{
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if (currentParagraphMinimumLineHeight && currentParagraphMinimumLineHeight > _lineHeight)
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_lineHeight = currentParagraphMinimumLineHeight;
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if (currentParagraphMaximumLineHeight && currentParagraphMaximumLineHeight < _lineHeight)
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_lineHeight = currentParagraphMaximumLineHeight;
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lineOrigin.y += _lineHeight;
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if (currentParagraphLineSpacing)
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lineOrigin.y += currentParagraphLineSpacing;
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if (lineOrigin.y > containerSizeHeight && _indexOfCurrentContainer < textContainersCount - 1)
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{
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_currentTextContainer = textContainers[++_indexOfCurrentContainer];
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containerSize = [_currentTextContainer containerSize];
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containerSizeWidth = containerSize.width;
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containerSizeHeight = containerSize.height;
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}
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lineOrigin.x = 0;
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numLines++;
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isNewline = NO;
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_lineFragments = [];
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_lineHeight = 0;
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_lineBase = ascent;
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}
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isTabStop = NO;
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isAttachment = NO;
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isWordWrapped = NO;
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_lineWidth = 0;
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advancements = [];
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currentAnchor = 0;
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prevRangeWidth = 0;
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lineRange = CPMakeRange(glyphIndex + 1, 0);
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measuringRange = CPMakeRange(glyphIndex + 1, 0);
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wrapRange = CPMakeRange(0, 0);
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wrapWidth = 0;
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}
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}
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// this is to "flush" the remaining characters
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if (lineRange.length)
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[self _flushRange:lineRange lineOrigin:lineOrigin currentContainer:_currentTextContainer advancements:advancements lineCount:numLines sameLine:NO];
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var rect = CGRectMake(1, lineOrigin.y - descent, containerSizeWidth, currentFontLineHeight);
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[_layoutManager setExtraLineFragmentRect:rect usedRect:rect textContainer:_currentTextContainer];
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var fragment = [_layoutManager._lineFragments lastObject];
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if (fragment)
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fragment._isLast = YES;
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}
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@end
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