88 lines
2.5 KiB
Objective-C
88 lines
2.5 KiB
Objective-C
//
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// MPFractionFunctionLayout.m
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// MathPad
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//
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// Created by Kim Wittenburg on 07.10.14.
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// Copyright (c) 2014 Kim Wittenburg. All rights reserved.
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//
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#import "MPFractionFunctionLayout.h"
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#import "MPExpressionLayout.h"
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#define kFractionFunctionLineWidth 1.0
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#define kFractionFunctionHorizontalInset 2.0
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#define kFractionFunctionNominatorOffset 0
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#define kFractionFunctionDenominatorOffset 0
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#define MPFractionMiddle (CTFontGetCapHeight((CTFontRef)self.font) / 2)
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@implementation MPFractionFunctionLayout
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- (MPFractionFunction *)fractionFunction
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{
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return (MPFractionFunction *)self.function;
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}
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- (NSUInteger)indexOfChildBelowChildAtIndex:(NSUInteger)index
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{
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return 1;
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}
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- (NSUInteger)indexOfChildAboveChildAtIndex:(NSUInteger)index
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{
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return 0;
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}
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- (NSIndexSet *)indexesOfRemainingChildren
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{
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return [NSIndexSet indexSetWithIndexesInRange:NSMakeRange(0, 1)];
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}
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- (NSPoint)offsetOfChildLayoutAtIndex:(NSUInteger)index
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{
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if (index == 0) {
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NSRect nominatorBounds = [self childLayoutAtIndex:0].bounds;
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CGFloat y = MPFractionMiddle + kFractionFunctionLineWidth / 2 - nominatorBounds.origin.y;
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return NSMakePoint(kFractionFunctionHorizontalInset, y);
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} else {
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NSRect denominatorBounds = [self childLayoutAtIndex:1].bounds;
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CGFloat y = MPFractionMiddle - kFractionFunctionLineWidth / 2;
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y -= denominatorBounds.size.height + denominatorBounds.origin.y;
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return NSMakePoint(kFractionFunctionHorizontalInset, y);
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}
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}
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- (BOOL)childAtIndexUsesSmallSize:(NSUInteger)index
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{
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return YES;
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}
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- (NSIndexPath *)indexPathForLocalMousePoint:(NSPoint)point
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{
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if (point.x < self.bounds.size.width / 2) {
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return [NSIndexPath indexPathWithIndex:0];
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} else {
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return [NSIndexPath indexPathWithIndex:1];
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}
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}
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- (NSRect)generateBounds
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{
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NSRect nominatorBounds = [self childLayoutAtIndex:0].bounds;
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NSRect denominatorBounds = [self childLayoutAtIndex:1].bounds;
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NSRect bounds;
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bounds.origin.x = 0;
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bounds.origin.y = MPFractionMiddle - kFractionFunctionLineWidth / 2 - denominatorBounds.size.height;
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bounds.size.width = MAX(nominatorBounds.size.width, denominatorBounds.size.width) + 2 * kFractionFunctionHorizontalInset;
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bounds.size.height = nominatorBounds.size.height + denominatorBounds.size.height + kFractionFunctionLineWidth;
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return bounds;
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}
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- (void)draw
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{
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CGFloat y = MPFractionMiddle - kFractionFunctionLineWidth / 2;
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NSRectFill(NSMakeRect(0, y, self.bounds.size.width, kFractionFunctionLineWidth));
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}
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@end
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