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229 lines
10 KiB
Objective-C
Executable File
229 lines
10 KiB
Objective-C
Executable File
//
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// CYRLayoutManager.h
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//
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// Version 0.2.0
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//
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// Created by Illya Busigin on 01/05/2014.
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// Copyright (c) 2014 Cyrillian, Inc.
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//
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// Distributed under MIT license.
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// Get the latest version from here:
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//
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// https://github.com/illyabusigin/CYRTextView
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// Original implementation taken from: https://github.com/alldritt/TextKit_LineNumbers
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//
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// The MIT License (MIT)
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//
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// Copyright (c) 2014 Cyrillian, Inc.
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy of
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// this software and associated documentation files (the "Software"), to deal in
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// the Software without restriction, including without limitation the rights to
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// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
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// the Software, and to permit persons to whom the Software is furnished to do so,
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// subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in all
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// copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
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// FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
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// COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
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// IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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// CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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#import "CYRLayoutManager.h"
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static CGFloat kMinimumGutterWidth = 30.f;
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@interface CYRLayoutManager ()
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@property (nonatomic, assign) CGFloat gutterWidth;
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@property (nonatomic, assign) UIEdgeInsets lineAreaInset;
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@property (nonatomic) NSUInteger lastParaLocation;
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@property (nonatomic) NSUInteger lastParaNumber;
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@end
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@implementation CYRLayoutManager
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#pragma mark - Initialization & Setup
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- (instancetype)init
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{
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self = [super init];
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if (self)
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{
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[self _commonSetup];
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}
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return self;
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}
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- (instancetype)initWithCoder:(NSCoder *)aDecoder
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{
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self = [super initWithCoder:aDecoder];
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if (self)
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{
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[self _commonSetup];
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}
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return self;
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}
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- (void)_commonSetup
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{
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self.gutterWidth = kMinimumGutterWidth;
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self.selectedRange = NSMakeRange(0, 0);
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self.lineAreaInset = UIEdgeInsetsMake(0, 10, 0, 4);
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self.lineNumberColor = [UIColor grayColor];
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self.lineNumberFont = [UIFont systemFontOfSize:10.0f];
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}
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#pragma mark - Convenience
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- (CGRect)paragraphRectForRange:(NSRange)range
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{
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range = [self.textStorage.string paragraphRangeForRange:range];
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range = [self glyphRangeForCharacterRange:range actualCharacterRange:NULL];
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CGRect startRect = [self lineFragmentRectForGlyphAtIndex:range.location effectiveRange:NULL];
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CGRect endRect = [self lineFragmentRectForGlyphAtIndex:range.location + range.length - 1 effectiveRange:NULL];
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CGRect paragraphRectForRange = CGRectUnion(startRect, endRect);
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paragraphRectForRange = CGRectOffset(paragraphRectForRange, _gutterWidth, 8);
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return paragraphRectForRange;
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}
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- (NSUInteger) _paraNumberForRange:(NSRange) charRange
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{
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// NSString does not provide a means of efficiently determining the paragraph number of a range of text. This code
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// attempts to optimize what would normally be a series linear searches by keeping track of the last paragraph number
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// found and uses that as the starting point for next paragraph number search. This works (mostly) because we
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// are generally asked for continguous increasing sequences of paragraph numbers. Also, this code is called in the
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// course of drawing a pagefull of text, and so even when moving back, the number of paragraphs to search for is
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// relativly low, even in really long bodies of text.
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//
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// This all falls down when the user edits the text, and can potentially invalidate the cached paragraph number which
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// causes a (potentially lengthy) search from the beginning of the string.
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if (charRange.location == self.lastParaLocation)
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return self.lastParaNumber;
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else if (charRange.location < self.lastParaLocation)
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{
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// We need to look backwards from the last known paragraph for the new paragraph range. This generally happens
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// when the text in the UITextView scrolls downward, revaling paragraphs before/above the ones previously drawn.
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NSString* s = self.textStorage.string;
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__block NSUInteger paraNumber = self.lastParaNumber;
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[s enumerateSubstringsInRange:NSMakeRange(charRange.location, self.lastParaLocation - charRange.location)
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options:NSStringEnumerationByParagraphs |
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NSStringEnumerationSubstringNotRequired |
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NSStringEnumerationReverse
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usingBlock:^(NSString *substring, NSRange substringRange, NSRange enclosingRange, BOOL *stop){
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if (enclosingRange.location <= charRange.location) {
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*stop = YES;
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}
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--paraNumber;
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}];
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self.lastParaLocation = charRange.location;
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self.lastParaNumber = paraNumber;
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return paraNumber;
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}
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else
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{
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// We need to look forward from the last known paragraph for the new paragraph range. This generally happens
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// when the text in the UITextView scrolls upwards, revealing paragraphs that follow the ones previously drawn.
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NSString* s = self.textStorage.string;
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__block NSUInteger paraNumber = self.lastParaNumber;
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[s enumerateSubstringsInRange:NSMakeRange(self.lastParaLocation, charRange.location - self.lastParaLocation)
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options:NSStringEnumerationByParagraphs | NSStringEnumerationSubstringNotRequired
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usingBlock:^(NSString *substring, NSRange substringRange, NSRange enclosingRange, BOOL *stop){
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if (enclosingRange.location >= charRange.location) {
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*stop = YES;
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}
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++paraNumber;
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}];
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self.lastParaLocation = charRange.location;
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self.lastParaNumber = paraNumber;
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return paraNumber;
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}
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}
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#pragma mark - Layouting
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- (void)processEditingForTextStorage:(NSTextStorage *)textStorage edited:(NSTextStorageEditActions)editMask range:(NSRange)newCharRange changeInLength:(NSInteger)delta invalidatedRange:(NSRange)invalidatedCharRange
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{
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[super processEditingForTextStorage:textStorage edited:editMask range:newCharRange changeInLength:delta invalidatedRange:invalidatedCharRange];
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if (invalidatedCharRange.location < self.lastParaLocation)
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{
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// When the backing store is edited ahead the cached paragraph location, invalidate the cache and force a complete
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// recalculation. We cannot be much smarter than this because we don't know how many paragraphs have been deleted
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// since the text has already been removed from the backing store.
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self.lastParaLocation = 0;
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self.lastParaNumber = 0;
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}
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}
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#pragma mark - Drawing
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- (void) drawBackgroundForGlyphRange:(NSRange)glyphsToShow atPoint:(CGPoint)origin
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{
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if (!self.shouldCompletelyHideGutter)
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{
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[super drawBackgroundForGlyphRange:glyphsToShow atPoint:origin];
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// Draw line numbers. Note that the background for line number gutter is drawn by the LineNumberTextView class.
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NSDictionary* atts = @{NSFontAttributeName : _lineNumberFont ,
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NSForegroundColorAttributeName : _lineNumberColor};
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[self enumerateLineFragmentsForGlyphRange:glyphsToShow
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usingBlock:^(CGRect rect, CGRect usedRect, NSTextContainer *textContainer, NSRange glyphRange, BOOL *stop) {
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NSRange charRange = [self characterRangeForGlyphRange:glyphRange actualGlyphRange:nil];
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NSRange paraRange = [self.textStorage.string paragraphRangeForRange:charRange];
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BOOL showCursorRect = NSLocationInRange(_selectedRange.location, paraRange);
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if (showCursorRect)
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{
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CGContextRef context = UIGraphicsGetCurrentContext();
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CGRect cursorRect = CGRectMake(0, usedRect.origin.y + 8, _gutterWidth, usedRect.size.height);
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CGContextSetFillColorWithColor(context, [UIColor colorWithWhite:0.9 alpha:1].CGColor);
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CGContextFillRect(context, cursorRect);
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}
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// Only draw line numbers for the paragraph's first line fragment. Subsequent fragments are wrapped portions of the paragraph and don't get the line number.
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if (charRange.location == paraRange.location) {
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CGRect gutterRect = CGRectOffset(CGRectMake(0, rect.origin.y, _gutterWidth, rect.size.height), origin.x, origin.y);
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NSUInteger paraNumber = [self _paraNumberForRange:charRange];
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NSString* ln = [NSString stringWithFormat:@"%ld", (unsigned long) paraNumber + 1];
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CGSize size = [ln sizeWithAttributes:atts];
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[ln drawInRect:CGRectOffset(gutterRect, CGRectGetWidth(gutterRect) - _lineAreaInset.right - size.width - _gutterWidth, (CGRectGetHeight(gutterRect) - size.height) / 2.0)
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withAttributes:atts];
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}
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}];
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}
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}
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@end
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