Added MPExpressionLayout, MPFunctionLayout and MPExpressionStorage as Rendering System for Expressions

MathPad/MPFunctionLayout.h

@@ -0,0 +1,56 @@
+//
+//  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;
+
+- (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