Added Function Chooser as a Popover

Improved Evaluation
Added Parenthesis Function

MathPad/MPFunctionLayout.h

@@ -26,6 +26,8 @@
 #pragma mark Cache Methods
 - (CTLineRef)lineForPrivateCacheIndex:(NSUInteger)index
                             generator:(CTLineRef (^)())generator;
+- (id)objectForPrivateCacheIndex:(NSUInteger)index
+                       generator:(id (^)())generator;
 
 // Should also implement accessor method for special function type:
 // - (MPCustomFunction *)customFunction
@@ -34,10 +36,12 @@
 // }
 
 #pragma mark Size and Drawing Methods
+- (BOOL)childAtIndexUsesSmallSize:(NSUInteger)index; // May be implemented
 - (NSPoint)offsetOfChildLayoutAtIndex:(NSUInteger)index; // To be implemented
-- (NSIndexPath *)indexPathForMousePoint:(NSPoint)point; // To be implemented
+- (NSIndexPath *)indexPathForMousePoint:(NSPoint)point;
+- (NSIndexPath *)indexPathForLocalMousePoint:(NSPoint)point; // To be implemented
 - (NSRect)generateBounds; // To be implemented
-- (void)drawAtPoint:(NSPoint)point; // To be implemented
+- (void)draw; // To be implemented
 
 // Specify the child that is used when the cursor enters the function from the left or right respectively
 - (NSUInteger)indexOfLeadingChild; // To be implemented
@@ -46,5 +50,8 @@
 // The index of the child before (left) or after (right) the child at @c index. return NSNotFound if there is no child before or after @c index.
 - (NSUInteger)indexOfChildBeforeChildAtIndex:(NSUInteger)index; // May be implemented
 - (NSUInteger)indexOfChildAfterChildAtIndex:(NSUInteger)index; // May be implemented
+- (NSUInteger)indexOfChildBelowChildAtIndex:(NSUInteger)index; // May be implemented
+- (NSUInteger)indexOfChildAboveChildAtIndex:(NSUInteger)index; // May be implemented
+- (NSIndexSet *)indexesOfRemainingChildren; // May be implemented
 
 @end