Interface Redesign to show evaluation results

MathPad/MPDocument.m

@@ -7,7 +7,6 @@
 //
 
 #import "MPDocument.h"
-#import "MPView.h"
 
 @implementation MPDocument
 
@@ -30,6 +29,8 @@
 - (void)windowControllerDidLoadNib:(NSWindowController *)aController
 {
     [super windowControllerDidLoadNib:aController];
+    self.expressionView.target = self;
+    self.expressionView.action = @selector(evaluateExpression:);
     // Add any code here that needs to be executed once the windowController has loaded the document's window.
 }
 
@@ -58,12 +59,11 @@
 }
 
 #pragma mark Actions
-- (IBAction)evaluateExpressiom:(id)sender {
-    NSError *error;
-    NSLog(@"Result: %f", [self.resultExpressionView.expressionStorage evaluateExpression:&error]);
-    if (error) {
-        NSLog(@"Error: %@", error);
-    }
+- (IBAction)evaluateExpression:(id)sender {
+    MPParseError *error;
+    NSDecimalNumber *result = [self.expressionView.expressionStorage evaluateWithError:&error];
+    self.resultLabel.stringValue = result != nil ? result.description : @"Error!";
+    self.errorLabel.stringValue = error != nil ? error.description : @"No Error";
 }
 
 @end