Improved Model

Added Keyboard Selection Support
Added Mouse Selection Support
Added Keyboard Editing Support
Corrected Some Bugs
Abstracted the Layout System further
Added Functions Button (test)

MathPad/MPLayout.h

@@ -15,11 +15,17 @@
 
 #pragma mark Creation Methods
 - (instancetype)init;
-- (instancetype)initWithPath:(NSIndexPath *)path
-                      parent:(MPLayout *)parent;
+- (instancetype)initWithElementAtPath:(NSIndexPath *)path
+                     inRootExpression:(MPExpression *)rootExpression
+                               parent:(MPLayout *)parent;
 
-#pragma mark Text System Objects
-@property (readonly, nonatomic, weak) MPExpressionStorage *expressionStorage;
+#pragma mark Properties
+- (NSFont *)font;
+- (CGFloat)fontSize;
+- (NSFont *)normalFont;
+- (CGFloat)normalFontSize;
+- (NSFont *)smallFont;
+- (CGFloat)smallFontSize;
 
 #pragma mark Cache Tree
 @property (readonly, nonatomic, weak) MPLayout *parent;
@@ -35,14 +41,21 @@
 - (void)invalidate;
 
 #pragma mark Calculation and Drawing Methods
-// TODO: Implement Small Size
-// @property (nonatomic) BOOL usesSmallSize;
-- (NSSize)size;
+@property (nonatomic, getter = isFlipped) BOOL flipped;
+@property (nonatomic) BOOL usesSmallSize;
+- (NSRect)bounds;
+
+- (NSRect)boundingRectForRangePath:(MPRangePath *)rangePath; /* if rangePath.length is 0 the returned rect will have a width of 0 */
+
 - (void)drawAtPoint:(NSPoint)point;
 
 @end
 
 @interface MPLayout (MPSubclassImplement)
 - (MPLayout *)childLayoutAtIndex:(NSUInteger)index; // To be implemented
-- (NSSize)generateSize; // To be implemented
+- (NSRect)generateBounds; // To be implemented
+- (NSRect)boundingRectForRange:(NSRange)range; // To be implemented, use rangePath instead, this one has wrong origin
+- (NSPoint)offsetOfChildLayoutAtIndex:(NSUInteger)index;
+- (NSIndexPath *)indexPathForMousePoint:(NSPoint)point;
+- (void)draw; // To be implemented
 @end