Added MPExpressionLayout, MPFunctionLayout and MPExpressionStorage as Rendering System for Expressions

MathPad/MPExpressionLayout.h

@@ -0,0 +1,63 @@
+//
+//  MPExpressionLayout.h
+//  MathPad
+//
+//  Created by Kim Wittenburg on 22.04.14.
+//  Copyright (c) 2014 Kim Wittenburg. All rights reserved.
+//
+
+#import <Foundation/Foundation.h>
+
+@class MPExpressionLayout, MPFunctionLayout, MPExpressionStorage, MPExpression;
+
+@interface MPExpressionLayout : NSObject {
+    BOOL _valid;
+    NSSize _cachedSize;
+    NSMutableArray *_symbolCache;
+}
+
+#pragma mark Creation Methods
+
+// -init not supported
+- (id)initRootLayoutWithExpressionStorage:(MPExpressionStorage *)expressionStorage;
+- (id)initWithExpressionPath:(NSIndexPath *)expressionPath
+                      parent:(MPFunctionLayout *)parent;
+
+#pragma mark Properties
+
+@property (readonly, nonatomic, weak) MPFunctionLayout *parent;
+
+@property (readonly, nonatomic, weak) MPExpressionStorage *expressionStorage;
+@property (readonly, nonatomic, strong) NSIndexPath *expressionPath;
+
+- (MPExpression *)expression; // Convenience
+- (NSLayoutManager *)layoutManager;
+- (NSTextContainer *)textContainer;
+- (NSTextStorage *)textStorage;
+
+#pragma mark Cache Methods
+
+- (void)invalidate;
+- (void)expressionEditedInRange:(NSRange)range
+              replacementLength:(NSUInteger)length;
+
+- (BOOL)hasCacheForSymbolAtIndex:(NSUInteger)index;
+- (MPFunctionLayout *)functionLayoutForFunctionAtIndex:(NSUInteger)index;
+- (NSSize)cachedSizeForSymbolAtIndex:(NSUInteger)index;
+- (void)cacheSize:(NSSize)size forSymbolAtIndex:(NSUInteger)index;
+
+#pragma mark Sizes Calculation Methods
+
+- (NSSize)sizeForAllSymbols;
+- (NSSize)sizeForSymbolAtIndex:(NSUInteger)index;
+- (NSSize)sizeForSymbolsInRange:(NSRange)range;
+
+#pragma mark Drawing Methods
+
+- (void)drawSymbolAtIndex:(NSUInteger)index
+                  atPoint:(NSPoint)point;
+- (void)drawSymbolsInRange:(NSRange)range
+                   atPoint:(NSPoint)point;
+- (void)drawAllSymbolsAtPoint:(NSPoint)point;
+
+@end