Fundamental Redesign of the View and Controller

MathPad/MPExpressionStorage.m

@@ -7,6 +7,7 @@
 //
 
 #import "MPExpressionStorage.h"
+#import "MPExpressionView.h"
 #import "MPExpressionLayout.h"
 #import "MPFunctionLayout.h"
 #import "MPRangePath.h"
@@ -19,6 +20,15 @@
 
 @implementation MPExpressionStorage
 
+- (instancetype)initWithExpressionView:(MPExpressionView *)expressionView elements:(NSArray *)elements
+{
+    self = [self initWithElements:elements];
+    if (self) {
+        _expressionView = expressionView;
+    }
+    return self;
+}
+
 - (instancetype)initWithElements:(NSArray *)elements
 {
     self = [super initWithElements:elements];
@@ -69,7 +79,9 @@
     for (NSUInteger index = 1; index < rangePath.location.length-1; index++) {
         current = [current childLayoutAtIndex:index];
     }
-    [current clearCacheInRange:rangePath.rangeAtLastIndex replacementLength:replacementLength];
+    [current clearCacheInRange:rangePath.rangeAtLastIndex
+             replacementLength:replacementLength];
+    self.expressionView.needsDisplay = YES;
 }
 
 @end