60760b8b3d
- Combined MPExpression and MPMutableExpression - Abstracted children of MPExpression into MPExpressionElement protocol - Abstracted most of MPExpressionLayout and MPFunctionLayout into common superclass MPLayout
76 lines
2.1 KiB
Objective-C
76 lines
2.1 KiB
Objective-C
//
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// MPExpressionStorage.m
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// MathPad
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//
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// Created by Kim Wittenburg on 22.04.14.
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// Copyright (c) 2014 Kim Wittenburg. All rights reserved.
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//
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#import "MPExpressionStorage.h"
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#import "MPExpressionLayout.h"
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#import "MPFunctionLayout.h"
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#import "MPRangePath.h"
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@interface MPExpressionStorage ()
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@property (nonatomic, strong) NSLayoutManager *layoutManager;
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@property (nonatomic, strong) NSTextContainer *textContainer;
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@property (nonatomic, strong) NSTextStorage *textStorage;
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@end
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@implementation MPExpressionStorage
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- (instancetype)initWithElements:(NSArray *)elements
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{
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self = [super initWithElements:elements];
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if (self) {
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_rootLayout = [[MPExpressionLayout alloc] initRootLayoutWithExpressionStorage:self];
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}
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return self;
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}
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- (NSLayoutManager *)layoutManager
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{
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[self ensureTextSystemObjects];
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return _layoutManager;
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}
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- (NSTextContainer *)textContainer
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{
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[self ensureTextSystemObjects];
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return _textContainer;
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}
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- (NSTextStorage *)textStorage
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{
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[self ensureTextSystemObjects];
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return _textStorage;
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}
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- (void)ensureTextSystemObjects
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{
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if (_layoutManager == nil || _textContainer == nil || _textStorage == nil) {
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_textStorage = [[NSTextStorage alloc] init];
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NSTextContainer *textContainer = [[NSTextContainer alloc] initWithContainerSize:NSMakeSize(CGFLOAT_MAX, CGFLOAT_MAX)];
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NSLayoutManager *layoutManager = [[NSLayoutManager alloc] init];
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[layoutManager addTextContainer:textContainer];
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[_textStorage addLayoutManager:layoutManager];
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_textContainer = textContainer;
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_layoutManager = layoutManager;
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}
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}
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- (void)didChangeElementsInRangePath:(MPRangePath *)rangePath
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replacementLength:(NSUInteger)replacementLength
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{
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if (rangePath.location.length == 0) {
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return;
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}
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MPLayout *current = self.rootLayout;
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for (NSUInteger index = 1; index < rangePath.location.length-1; index++) {
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current = [current childLayoutAtIndex:index];
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}
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[current clearCacheInRange:rangePath.rangeAtLastIndex replacementLength:replacementLength];
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}
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@end
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