Reorganized File Structure

Added Documentation

MathKit/MPExpressionStorage.m

@@ -0,0 +1,58 @@
+//
+//  MPExpressionStorage.m
+//  MathPad
+//
+//  Created by Kim Wittenburg on 22.04.14.
+//  Copyright (c) 2014 Kim Wittenburg. All rights reserved.
+//
+
+#import "MPExpressionStorage.h"
+
+#import "MPExpressionView.h"
+#import "MPLayout.h"
+#import "MPExpressionLayout.h"
+
+#import "MPRangePath.h"
+
+@interface MPExpressionStorage ()
+@property (nonatomic, strong) NSLayoutManager *layoutManager;
+@property (nonatomic, strong) NSTextContainer *textContainer;
+@property (nonatomic, strong) NSTextStorage *textStorage;
+@end
+
+@implementation MPExpressionStorage
+
+- (instancetype)initWithElements:(NSArray *)elements
+{
+    self = [super initWithElements:elements];
+    if (self) {
+        _rootLayout = [[MPExpressionLayout alloc] initWithExpression:self parent:nil];
+    }
+    return self;
+}
+
+- (void)setExpressionView:(MPExpressionView *)expressionView
+{
+    _expressionView = expressionView;
+    self.rootLayout = [[MPExpressionLayout alloc] initWithExpression:self parent:nil];
+    self.rootLayout.flipped = expressionView.flipped;
+}
+
+- (void)changedElementsInRangePath:(MPRangePath *)rangePath
+                   replacementLength:(NSUInteger)replacementLength
+{
+    if (rangePath.location.length == 0) {
+        return;
+    }
+    MPLayout *current = self.rootLayout;
+    for (NSUInteger position = 0; position < rangePath.location.length-1; position++) {
+        NSUInteger index = [rangePath.location indexAtPosition:position];
+        current = [current childLayoutAtIndex:index];
+    }
+    [current clearCacheInRange:rangePath.rangeAtLastIndex
+             replacementLength:replacementLength];
+    [self.expressionView invalidateIntrinsicContentSize];
+    self.expressionView.needsDisplay = YES;
+}
+
+@end