//
//  MPFunctionLayout.h
//  MathPad
//
//  Created by Kim Wittenburg on 22.04.14.
//  Copyright (c) 2014 Kim Wittenburg. All rights reserved.
//

#import <Foundation/Foundation.h>

@class MPFunctionLayout, MPExpressionLayout, MPExpressionStorage, MPFunction;

@interface MPFunctionLayout : NSObject {
    @protected
    BOOL _valid;
    NSSize _cachedSize;
    NSMutableArray *_childCache;
}

#pragma mark Creation Methods

+ (instancetype)functionLayoutForFunctionAtIndexPath:(NSIndexPath *)functionPath
                                              parent:(MPExpressionLayout *)parent;

- (id)initWithFunctionPath:(NSIndexPath *)functionPath
                    parent:(MPExpressionLayout *)parent;

#pragma mark Properties

@property (readonly, nonatomic, weak) MPExpressionLayout *parent;

@property (readonly, nonatomic, strong) NSIndexPath *functionPath;

- (MPExpressionStorage *)expressionStorage;
- (MPFunction *)function; // Convenience
- (NSLayoutManager *)layoutManager;
- (NSTextContainer *)textContainer;
- (NSTextStorage *)textStorage;

#pragma mark Cache Methods

- (void)invalidate;
- (void)editedChildAtIndex:(NSUInteger)index;

- (BOOL)hasCacheForChildAtIndex:(NSUInteger)index;
- (MPExpressionLayout *)expressionLayoutForChildAtIndex:(NSUInteger)index;

#pragma mark Size Calculation Methods

- (NSSize)sizeOfFunction;
- (NSSize)calculateSize;

#pragma mark Drawing Methods

- (void)drawFunctionAtPoint:(NSPoint)point;

@end