Fundamental Redesign of the View and Controller

MathPad/MPDocument.m

@@ -61,7 +61,6 @@
 #pragma mark Actions
 - (IBAction)changeExpression:(id)sender {
     [self.resultExpressionView.expressionStorage insertElement:@"abc" atLocation:6];
-    self.resultExpressionView.needsDisplay = YES;
 }
 
 @end

MathPad/MPExpressionLayout.h

@@ -14,6 +14,6 @@
 
 - (instancetype)initRootLayoutWithExpressionStorage:(MPExpressionStorage *)expressionStorage;
 
-@property (readonly, nonatomic, weak) MPExpression *expression; // Convenience
+@property (readonly, nonatomic, weak) MPExpression *expression;
 
 @end

MathPad/MPExpressionLayout.m

@@ -9,45 +9,38 @@
 #import "MPExpressionLayout.h"
 #import "MPFunctionLayout.h"
 
-@interface MPExpressionLayout (MPPathGeneration)
+@interface MPExpressionLayout (MPLineGeneration)
-
-- (NSBezierPath *)bezierPathForChildAtIndex:(NSUInteger)index;
-- (NSBezierPath *)generateBezierPathForString:(NSString *)aString;
 
+- (CTLineRef)lineForElementAtIndex:(NSUInteger)index;
+- (CTLineRef)createLineForString:(NSString *)aString;
 
 @end
 
-@implementation MPExpressionLayout (MPPathGeneration)
+@implementation MPExpressionLayout (MPLineGeneration)
 
-- (NSBezierPath *)bezierPathForChildAtIndex:(NSUInteger)index
+- (CTLineRef)lineForElementAtIndex:(NSUInteger)index
 {
-    id symbol = [self.expression elementAtIndex:index];
+    id element = [self.expression elementAtIndex:index];
-    if ([symbol isString]) {
+    if (![element isString]) {
-        return [self cachableObjectForIndex:index
+        return NULL;
-                                  generator:^id{
+    }
-            return [self generateBezierPathForString:symbol];
+    NSString *string = element;
+    id lineObject = [self cachableObjectForIndex:index generator:^id{
+        CTLineRef line = [self createLineForString:string];
+        return CFBridgingRelease(line);
     }];
-    } else {
+    return (__bridge CTLineRef)lineObject;
-        MPLayout *layout = [self childLayoutAtIndex:index];
-        return layout.bezierPath;
-    }
 }
 
-- (NSBezierPath *)generateBezierPathForString:(NSString *)aString
+- (CTLineRef)createLineForString:(NSString *)aString
 {
+    
     NSAttributedString *text = [[NSAttributedString alloc] initWithString:aString
                                                                attributes:@{NSFontAttributeName: [NSFont fontWithName:@"Lucida Grande" size:18.0]}];
-    self.textStorage.attributedString = text;
+    CFAttributedStringRef attributedString = CFBridgingRetain(text);
-    NSRange glyphRange = [self.layoutManager glyphRangeForTextContainer:self.textContainer];
+    CTLineRef line = CTLineCreateWithAttributedString(attributedString);
-    NSGlyph glyphs[glyphRange.length+1];
+    CFRelease(attributedString); // TODO: Is this release appropriate?
-    NSUInteger actualGlyphCount = [self.layoutManager getGlyphs:glyphs
+    return line;
-                                                          range:glyphRange];
-    NSBezierPath *path = [NSBezierPath bezierPath];
-    [path moveToPoint:NSZeroPoint];
-    [path appendBezierPathWithGlyphs:glyphs
-                               count:actualGlyphCount
-                              inFont:[NSFont fontWithName:@"Lucida Grande" size:18.0]];
-    return path;
 }
 
 @end
@@ -60,6 +53,18 @@
     self = [super init];
     if (self) {
         _expressionStorage = expressionStorage;
+        _expression = expressionStorage;
+    }
+    return self;
+}
+
+- (instancetype)initWithPath:(NSIndexPath *)path
+                      parent:(MPLayout *)parent
+{
+    self = [super initWithPath:path
+                        parent:parent];
+    if (self) {
+        _expression = [parent.expressionStorage elementAtIndexPath:path];
     }
     return self;
 }
@@ -74,52 +79,92 @@
     return self.parent.expressionStorage;
 }
 
-- (MPExpression *)expression
+//- (MPExpression *)expression
-{
+//{
-    return [self.expressionStorage elementAtIndexPath:self.path];
+//    return [self.expressionStorage elementAtIndexPath:self.path];
-}
+//}
 
 #pragma mark Cache Methods
 - (MPLayout *)childLayoutAtIndex:(NSUInteger)index
 {
     id cachedObject = [self cachableObjectForIndex:index generator:^id{
-        NSIndexPath *indexPath = [self.path indexPathByAddingIndex:index];
+        NSIndexPath *indexPath = [self.expression.indexPath indexPathByAddingIndex:index];
         MPFunctionLayout *layout = [MPFunctionLayout functionLayoutForFunctionAtIndexPath:indexPath
                                                                                    parent:self];
         return layout;
     }];
-    if ([cachedObject isKindOfClass:[NSBezierPath class]]) {
+    if ([cachedObject isKindOfClass:[MPLayout class]]) {
-        return nil;
-    }
         return cachedObject;
     }
+    return nil;
+}
 
-- (NSSize)sizeForChildAtIndex:(NSUInteger)index
+- (NSSize)sizeForElementAtIndex:(NSUInteger)index
 {
     id symbol = [self.expression elementAtIndex:index];
     if ([symbol isString]) {
-        return [self bezierPathForChildAtIndex:index].bounds.size;
+        CTLineRef line = [self lineForElementAtIndex:index];
+        CFRetain(line);
+        CGRect bounds = CTLineGetBoundsWithOptions(line, /*kCTLineBoundsUseOpticalBounds*/ 0);
+        CFRelease(line);
+        return bounds.size;
     } else {
         return [self childLayoutAtIndex:index].size;
     }
 }
 
 #pragma mark Drawing Methods
-- (NSBezierPath *)generateBezierPath
+- (NSSize)generateSize
 {
-    NSBezierPath *fullPath = [NSBezierPath bezierPath];
+    CGFloat width = 0, height = 0;
-    [fullPath moveToPoint:NSZeroPoint];
+    for (NSUInteger index = 0; index < self.expression.numberOfElements; index++) {
-    NSUInteger x = 0;
+        NSSize elementSize = [self sizeForElementAtIndex:index];
-    for (NSInteger index = 0; index < self.expression.numberOfElements; ++index) {
+        width += elementSize.width;
-        NSAffineTransform *transform = [NSAffineTransform transform];
+        height = MAX(height, elementSize.height);
-        // TODO: Translate by the right amount
-        [transform translateXBy:x yBy:0];
-        NSBezierPath *path = [self bezierPathForChildAtIndex:index].copy;
-        [path transformUsingAffineTransform:transform];
-        [fullPath appendBezierPath:path];
-        x += path.bounds.size.width;
     }
-    return fullPath;
+    return NSMakeSize(width, height);
+}
+
+- (void)drawAtPoint:(NSPoint)point
+{
+    // Get the current context
+    CGContextRef context =
+        (CGContextRef)[[NSGraphicsContext currentContext] graphicsPort];
+    CGContextSaveGState(context);
+    
+    // Set the text matrix
+    CGContextSetTextMatrix(context, CGAffineTransformIdentity);
+    
+    // Track the x position
+    CGFloat x = point.x;
+    
+    for (NSUInteger index = 0; index < self.expression.numberOfElements; index++) {
+        // The current element
+        id element = [self.expression elementAtIndex:index];
+        NSSize elementSize = [self sizeForElementAtIndex:index];
+        CGFloat dy = (self.size.height - elementSize.height) / 2;
+        CGFloat y = point.y + dy;
+        
+        if ([element isString]) {
+            // Get the line to draw
+            CTLineRef line = [self lineForElementAtIndex:index];
+            CFRetain(line);
+            
+            // Move to the appropriate position
+            CGContextSetTextPosition(context, x, y);
+                        
+            // Perform the drawing
+            CTLineDraw(line, context);
+
+            CFRelease(line);
+        } else {
+            // Let the child layout draw itself
+            MPLayout *layout = [self childLayoutAtIndex:index];
+            [layout drawAtPoint:NSMakePoint(x, y)];
+        }
+        x += elementSize.width;
+    }
+    CGContextRestoreGState(context);
 }
 
 @end

MathPad/MPExpressionStorage.h

@@ -8,10 +8,14 @@
 
 #import "MPExpression.h"
 
-@class MPExpressionStorage, MPExpressionLayout;
+@class MPExpressionStorage, MPExpressionView, MPExpressionLayout;
 
 @interface MPExpressionStorage : MPExpression
 
+- (instancetype)initWithExpressionView:(MPExpressionView *)expressionView
+                              elements:(NSArray *)elements;
+
+@property (readonly, nonatomic, weak) MPExpressionView *expressionView;
 @property (nonatomic, strong) MPExpressionLayout *rootLayout;
 
 - (NSLayoutManager *)layoutManager;

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

MathPad/MPExpressionView.h

@@ -12,7 +12,7 @@
 
 @class MPExpressionView, MPExpressionStorage, MPExpressionLayout, MPRangePath;
 
-@interface MPExpressionView : NSView <NSUserInterfaceValidations>
+@interface MPExpressionView : NSView
 
 #pragma mark Creation Methods
 
@@ -23,6 +23,7 @@
 @property (readonly, nonatomic, strong) MPExpressionStorage *expressionStorage;
 
 @property (nonatomic, getter = isEditable) BOOL editable;
-@property (nonatomic, strong) MPRangePath *selection;
+//@property (nonatomic, strong) MPRangePath *selection;
+@property (nonatomic, strong) NSIndexPath *caretLocation;
 
 @end

MathPad/MPExpressionView.m

@@ -13,7 +13,7 @@
 #import "MPSumFunction.h"
 
 @interface MPExpressionView (MPCursor)
-@property (nonatomic, strong) NSTimer *cursorTimer;
+
 @end
 
 @implementation MPExpressionView
@@ -49,8 +49,9 @@
 
 - (void)initializeObjects
 {
-    MPExpressionStorage *expressionStorage = [[MPExpressionStorage alloc] initWithElements:@[@"12345", [[MPSumFunction alloc] init], [[MPSumFunction alloc] init]]];
+    MPExpressionStorage *expressionStorage = [[MPExpressionStorage alloc] initWithExpressionView:self elements:@[@"12345", [[MPSumFunction alloc] init], [[MPSumFunction alloc] init]]];
     _expressionStorage = expressionStorage;
+    _caretLocation = [[NSIndexPath alloc] initWithIndex:0];
 }
 
 #pragma mark Properties
@@ -60,9 +61,25 @@
     return NO;
 }
 
-- (void)setExpressionStorage:(MPExpressionStorage *)expressionStorage
+- (BOOL)acceptsFirstResponder
 {
-    _expressionStorage = expressionStorage;
+    return YES;
+}
+
+- (BOOL)canBecomeKeyView
+{
+    return YES;
+}
+
+#pragma mark Event Handling
+- (void)keyDown:(NSEvent *)theEvent
+{
+    [self interpretKeyEvents:@[theEvent]];
+}
+
+- (void)moveRight:(id)sender
+{
+    [self.expressionStorage deleteElementsInRange:NSMakeRange(0, 1)];
 }
 
 #pragma mark Drawing Methods

MathPad/MPFunctionLayout.h

@@ -14,18 +14,24 @@
 + (MPFunctionLayout *)functionLayoutForFunctionAtIndexPath:(NSIndexPath *)path
                                                     parent:(MPExpressionLayout *)parent;
 
-@property (readonly, nonatomic, weak) MPFunction *function; // Convenience
+@property (readonly, nonatomic, weak) MPFunction *function;
 
 @end
 
 @interface MPFunctionLayout (MPSubclassOverride)
 
+#pragma mark Cache Methods
+- (CTLineRef)lineForPrivateCacheIndex:(NSUInteger)index
+                            generator:(CTLineRef (^)())generator;
+
 // Should also implement accessor method for special function type:
 // - (MPCustomFunction *)customFunction
 // {
 //      return (MPCustomFunction *)self.function;
 // }
 
-- (NSBezierPath *)generateBezierPath;
+#pragma mark Size and Drawing Methods
+- (NSSize)generateSize; // To be implemented
+- (void)drawAtPoint:(NSPoint)point; // To be implemented
 
 @end

MathPad/MPFunctionLayout.m

@@ -27,32 +27,63 @@
     return [[self alloc] initWithPath:path parent:parent];
 }
 
-#pragma mark Properties
+- (instancetype)initWithPath:(NSIndexPath *)path
-- (MPFunction *)function
+                      parent:(MPLayout *)parent
 {
-    return [self.expressionStorage elementAtIndexPath:self.path];
+    self = [super initWithPath:path
+                        parent:parent];
+    if (self) {
+        _function = [parent.expressionStorage elementAtIndexPath:path];
+    }
+    return self;
 }
 
+#pragma mark Properties
+//- (MPFunction *)function
+//{
+//    return [self.expressionStorage elementAtIndexPath:self.path];
+//}
+
 #pragma mark Cache Methods
+- (CTLineRef)lineForPrivateCacheIndex:(NSUInteger)index
+                            generator:(CTLineRef (^)())generator
+{
+    NSUInteger actualIndex = self.function.numberOfChildren + index;
+    id (^actualGenerator)() = ^{
+        CTLineRef line = generator();
+        return CFBridgingRelease(line);
+    };
+    id lineObject = [self cachableObjectForIndex:actualIndex
+                                       generator:actualGenerator];
+    return (__bridge CTLineRef)(lineObject);
+}
+
 - (MPLayout *)childLayoutAtIndex:(NSUInteger)index
 {
     return [self cachableObjectForIndex:index generator:^id{
-        NSIndexPath *childPath = [self.path indexPathByAddingIndex:index];
+        NSIndexPath *childPath = [self.function.indexPath indexPathByAddingIndex:index];
         MPExpressionLayout *layout = [[MPExpressionLayout alloc] initWithPath:childPath
                                                                        parent:self];
         return layout;
     }];
 }
 
+#pragma mark Size and Drawing Methods
+
 - (NSSize)sizeForChildAtIndex:(NSUInteger)index
 {
     MPLayout *childLayout = [self childLayoutAtIndex:index];
     return [childLayout size];
 }
 
-- (NSBezierPath *)generateBezierPath
+- (NSSize)generateSize
 {
-    return [NSBezierPath bezierPath];
+    return NSZeroSize;
+}
+
+- (void)drawAtPoint:(NSPoint)point
+{
+    
 }
 
 @end

MathPad/MPLayout.h

@@ -20,13 +20,9 @@
 
 #pragma mark Text System Objects
 @property (readonly, nonatomic, weak) MPExpressionStorage *expressionStorage;
-@property (readonly, nonatomic, weak) NSLayoutManager *layoutManager;
-@property (readonly, nonatomic, weak) NSTextContainer *textContainer;
-@property (readonly, nonatomic, weak) NSTextStorage *textStorage;
 
 #pragma mark Cache Tree
 @property (readonly, nonatomic, weak) MPLayout *parent;
-@property (readonly, nonatomic, strong) NSIndexPath *path;
 
 #pragma mark Cache Methods
 // Querying Caches
@@ -39,18 +35,14 @@
 - (void)invalidate;
 
 #pragma mark Calculation and Drawing Methods
+// TODO: Implement Small Size
 // @property (nonatomic) BOOL usesSmallSize;
 - (NSSize)size;
-
-- (NSBezierPath *)bezierPath;
-- (NSBezierPath *)bezierPathAtOrigin:(NSPoint)point;
-
 - (void)drawAtPoint:(NSPoint)point;
 
 @end
 
 @interface MPLayout (MPSubclassImplement)
 - (MPLayout *)childLayoutAtIndex:(NSUInteger)index; // To be implemented
-- (NSSize)sizeForChildAtIndex:(NSUInteger)index; // To be implemented
+- (NSSize)generateSize; // To be implemented
-- (NSBezierPath *)generateBezierPath; // To be implemented
 @end

MathPad/MPLayout.m

@@ -10,19 +10,15 @@
 
 @interface MPLayout ()
 
-// Querying Caches
+// Querying and Storing Caches
 - (BOOL)hasCacheForElementAtIndex:(NSUInteger)index;
-
-// Storing Caches
-- (void)cacheObject:(id)anObject
-  forElementAtIndex:(NSUInteger)index;
 - (void)ensureCacheSizeForIndex:(NSUInteger)index;
 
 @end
 
 @implementation MPLayout {
     NSMutableArray *_cache;
-    NSBezierPath *_cachedPath;
+    NSSize _cachedSize;
 }
 
 #pragma mark Creation Methods
@@ -31,8 +27,7 @@
     self = [super init];
     if (self) {
         _cache = [[NSMutableArray alloc] init];
-        _cachedPath = nil;
+        _cachedSize = NSZeroSize;
-        _path = [[NSIndexPath alloc] init];
     }
     return self;
 }
@@ -42,7 +37,6 @@
 {
     self = [self init];
     if (self) {
-        _path = path;
         _parent = parent;
     }
     return self;
@@ -54,23 +48,8 @@
     return self.parent.expressionStorage;
 }
 
-- (NSLayoutManager *)layoutManager
-{
-    return self.expressionStorage.layoutManager;
-}
-
-- (NSTextContainer *)textContainer
-{
-    return self.expressionStorage.textContainer;
-}
-
-- (NSTextStorage *)textStorage
-{
-    return self.expressionStorage.textStorage;
-}
-
 #pragma mark Cache Tree
-// Querying Caches
+// Querying and Storing Caches
 - (BOOL)hasCacheForElementAtIndex:(NSUInteger)index
 {
     if (index >= _cache.count) {
@@ -86,17 +65,9 @@
         return _cache[index];
     }
     id object = generator();
-    [self cacheObject:object
-    forElementAtIndex:index];
-    return object;
-}
-
-// Storing Caches
-- (void)cacheObject:(id)anObject
-  forElementAtIndex:(NSUInteger)index
-{
     [self ensureCacheSizeForIndex:index];
-    _cache[index] = anObject;
+    _cache[index] = object;
+    return object;
 }
 
 - (void)ensureCacheSizeForIndex:(NSUInteger)index
@@ -121,39 +92,41 @@
 
 - (void)invalidate
 {
-    _cachedPath = nil;
+    _cachedSize = NSZeroSize;
     [self.parent invalidate];
 }
 
-#pragma mark Calculation Methods
+#pragma mark Calculation and Drawing Methods
 - (NSSize)size
 {
-    return self.bezierPath.bounds.size;
+    if (NSEqualSizes(_cachedSize, NSZeroSize)) {
+        _cachedSize = [self generateSize];
     }
-
+    return _cachedSize;
-- (NSBezierPath *)bezierPath
-{
-    if (!_cachedPath) {
-        _cachedPath = [self generateBezierPath];
-    }
-    return _cachedPath;
-}
-
-- (NSBezierPath *)bezierPathAtOrigin:(NSPoint)point
-{
-    NSAffineTransform *transform = [NSAffineTransform transform];
-    [transform translateXBy:point.x
-                        yBy:point.y];
-    NSBezierPath *path = [NSBezierPath bezierPath];
-    [path appendBezierPath:self.bezierPath];
-    [path transformUsingAffineTransform:transform];
-    return path;
 }
 
 - (void)drawAtPoint:(NSPoint)point
 {
-    NSBezierPath *path = [self bezierPathAtOrigin:point];
+    
-    [path fill];
+}
+
+@end
+
+@implementation MPLayout (MPSubclassImplement)
+
+- (MPLayout *)childLayoutAtIndex:(NSUInteger)index
+{
+    return nil;
+}
+
+- (NSSize)sizeForChildAtIndex:(NSUInteger)index
+{
+    return NSZeroSize;
+}
+
+- (NSSize)generateSize
+{
+    return NSZeroSize;
 }
 
 @end

MathPad/MPSumFunctionLayout.m

@@ -16,21 +16,46 @@
     return (MPSumFunction *)self.function;
 }
 
-- (NSBezierPath *)generateBezierPath
+- (CTLineRef)line
 {
-    NSAttributedString *text = [[NSAttributedString alloc] initWithString:@"∑"
+    CTLineRef line = [self lineForPrivateCacheIndex:0 generator:^CTLineRef{
+        NSAttributedString *text =
+            [[NSAttributedString alloc] initWithString:@"∑"
                                             attributes:@{NSFontAttributeName: [NSFont fontWithName:@"Lucida Grande" size:18.0]}];
-    self.textStorage.attributedString = text;
+        CFAttributedStringRef attributedString = CFBridgingRetain(text);
-    NSRange glyphRange = [self.layoutManager glyphRangeForTextContainer:self.textContainer];
+        CTLineRef line = CTLineCreateWithAttributedString(attributedString);
-    NSGlyph glyphs[glyphRange.length+1];
+        CFRelease(attributedString); // TODO: Is this release appropriate
-    NSUInteger actualGylphCount = [self.layoutManager getGlyphs:glyphs
+        return line;
-                                                          range:glyphRange];
+    }];
-    NSBezierPath *path = [NSBezierPath bezierPath];
+    return line;
-    [path moveToPoint:NSZeroPoint];
+}
-    [path appendBezierPathWithGlyphs:glyphs
+
-                               count:actualGylphCount
+- (NSSize)generateSize
-                              inFont:[NSFont fontWithName:@"Lucida Grande" size:18.0]];
+{
-    return path;
+    CTLineRef line = [self line];
+    CFRetain(line);
+    CGSize size = CTLineGetBoundsWithOptions(line, /*kCTLineBoundsUseOpticalBounds*/0).size;
+    CFRelease(line);
+    return size;
+}
+
+- (void)drawAtPoint:(NSPoint)point
+{
+    // Get the current context
+    CGContextRef context = (CGContextRef)[[NSGraphicsContext currentContext] graphicsPort];
+    
+    // Set the text matrix
+    CGContextSetTextMatrix(context, CGAffineTransformIdentity);
+    
+    // Get the line of text
+    CTLineRef line = [self line];
+    CFRetain(line);
+    
+    // Draw the line
+    CGContextSetTextPosition(context, point.x, point.y);
+    CTLineDraw(line, context);
+    
+    CFRelease(line);
 }
 
 @end