133 lines
2.5 KiB
Objective-C
133 lines
2.5 KiB
Objective-C
//
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// MPLayout.m
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// MathPad
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//
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// Created by Kim Wittenburg on 11.08.14.
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// Copyright (c) 2014 Kim Wittenburg. All rights reserved.
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//
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#import "MPLayout.h"
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@interface MPLayout ()
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// Querying and Storing Caches
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- (BOOL)hasCacheForElementAtIndex:(NSUInteger)index;
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- (void)ensureCacheSizeForIndex:(NSUInteger)index;
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@end
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@implementation MPLayout {
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NSMutableArray *_cache;
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NSSize _cachedSize;
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}
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#pragma mark Creation Methods
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- (id)init
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{
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self = [super init];
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if (self) {
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_cache = [[NSMutableArray alloc] init];
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_cachedSize = NSZeroSize;
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}
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return self;
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}
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- (id)initWithPath:(NSIndexPath *)path
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parent:(MPLayout *)parent
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{
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self = [self init];
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if (self) {
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_parent = parent;
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}
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return self;
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}
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#pragma Text System Objects
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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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#pragma mark Cache Tree
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// Querying and Storing Caches
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- (BOOL)hasCacheForElementAtIndex:(NSUInteger)index
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{
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if (index >= _cache.count) {
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return NO;
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}
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return _cache[index] != MPNull;
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}
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- (id)cachableObjectForIndex:(NSUInteger)index
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generator:(id (^)())generator
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{
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if ([self hasCacheForElementAtIndex:index]) {
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return _cache[index];
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}
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id object = generator();
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[self ensureCacheSizeForIndex:index];
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_cache[index] = object;
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return object;
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}
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- (void)ensureCacheSizeForIndex:(NSUInteger)index
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{
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while (index >= _cache.count) {
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[_cache addObject:MPNull];
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}
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}
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// Clearing Caches
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- (void)clearCacheInRange:(NSRange)range
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replacementLength:(NSUInteger)replacementLength
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{
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NSMutableArray *placeholders = [[NSMutableArray alloc] initWithCapacity:replacementLength];
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while (placeholders.count < replacementLength) {
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[placeholders addObject:MPNull];
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}
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[_cache replaceObjectsInRange:range
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withObjectsFromArray:placeholders];
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[self invalidate];
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}
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- (void)invalidate
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{
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_cachedSize = NSZeroSize;
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[self.parent invalidate];
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}
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#pragma mark Calculation and Drawing Methods
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- (NSSize)size
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{
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if (NSEqualSizes(_cachedSize, NSZeroSize)) {
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_cachedSize = [self generateSize];
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}
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return _cachedSize;
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}
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- (void)drawAtPoint:(NSPoint)point
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{
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}
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@end
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@implementation MPLayout (MPSubclassImplement)
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- (MPLayout *)childLayoutAtIndex:(NSUInteger)index
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{
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return nil;
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}
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- (NSSize)sizeForChildAtIndex:(NSUInteger)index
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{
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return NSZeroSize;
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}
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- (NSSize)generateSize
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{
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return NSZeroSize;
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}
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@end
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