fa499d299c
Added MPDisplayExtension Category to MPExpression and MPFunction Added Methods to Invalidate the Cache to MPExpressionLayout and MPFunctionLayout
131 lines
2.8 KiB
Objective-C
131 lines
2.8 KiB
Objective-C
//
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// MPFunctionLayout.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 "MPFunctionLayout.h"
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#import "MPExpressionLayout.h"
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#import "MPExpressionStorage.h"
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#import "MPFunction.h"
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#import "MPSumFunction.h"
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#import "MPSumFunctionLayout.h"
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@implementation MPFunctionLayout
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#pragma mark Creation Methods
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+ (instancetype)functionLayoutForFunctionAtIndexPath:(NSIndexPath *)functionPath
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parent:(MPExpressionLayout *)parent
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{
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MPFunction *function = [parent.expressionStorage symbolAtIndexPath:functionPath];
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Class class = [function class];
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if (class == [MPSumFunction class]) {
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return [[MPSumFunctionLayout alloc] initWithFunctionPath:functionPath parent:parent];
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}
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return nil;
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}
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- (id)initWithFunctionPath:(NSIndexPath *)functionPath
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parent:(MPExpressionLayout *)parent
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{
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self = [super init];
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if (self) {
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_functionPath = functionPath;
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_parent = parent;
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_childCache = [[NSMutableArray alloc] init];
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}
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return self;
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}
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#pragma mark Properties
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- (MPExpressionStorage *)expressionStorage
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{
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return self.parent.expressionStorage;
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}
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- (MPFunction *)function
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{
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return [self.expressionStorage symbolAtIndexPath:self.functionPath];
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}
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- (NSLayoutManager *)layoutManager
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{
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return self.expressionStorage.layoutManager;
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}
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- (NSTextContainer *)textContainer
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{
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return self.expressionStorage.textContainer;
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}
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- (NSTextStorage *)textStorage
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{
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return self.expressionStorage.textStorage;
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}
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#pragma mark Cache Methods
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- (void)invalidate
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{
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_valid = NO;
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[self.parent invalidate];
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}
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- (void)editedChildAtIndex:(NSUInteger)index
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{
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if ([self hasCacheForChildAtIndex:index]) {
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_childCache[index] = [NSNull null];
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}
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[self invalidate];
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}
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- (BOOL)hasCacheForChildAtIndex:(NSUInteger)index
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{
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if (index >= _childCache.count) {
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return NO;
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}
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return _childCache[index] != [NSNull null];
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}
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- (MPExpressionLayout *)expressionLayoutForChildAtIndex:(NSUInteger)index
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{
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if ([self hasCacheForChildAtIndex:index]) {
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return _childCache[index];
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}
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while (index >= _childCache.count) {
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[_childCache addObject:[NSNull null]];
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}
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MPExpressionLayout *expressionLayout = [[MPExpressionLayout alloc] initWithExpressionPath:[self.functionPath indexPathByAddingIndex:index] parent:self];
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_childCache[index] = expressionLayout;
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return expressionLayout;
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}
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#pragma mark Size Calculation Methods
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- (NSSize)sizeOfFunction
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{
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if (!_valid) {
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_cachedSize = [self calculateSize];
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_valid = YES;
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}
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return _cachedSize;
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}
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- (NSSize)calculateSize
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{
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return NSMakeSize(0, 0);
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}
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#pragma mark Drawing Methods
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- (void)drawFunctionAtPoint:(NSPoint)point
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{
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}
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@end
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