//
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// MASConstraint.m
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// Masonry
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//
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// Created by Jonas Budelmann on 20/07/13.
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// Copyright (c) 2013 cloudling. All rights reserved.
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//
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#import "MASViewConstraint.h"
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#import "MASConstraint+Private.h"
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#import "MASCompositeConstraint.h"
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#import "MASLayoutConstraint.h"
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#import "View+MASAdditions.h"
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#import <objc/runtime.h>
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@interface MAS_VIEW (MASConstraints)
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@property (nonatomic, readonly) NSMutableSet *mas_installedConstraints;
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@end
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@implementation MAS_VIEW (MASConstraints)
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static char kInstalledConstraintsKey;
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- (NSMutableSet *)mas_installedConstraints {
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NSMutableSet *constraints = objc_getAssociatedObject(self, &kInstalledConstraintsKey);
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if (!constraints) {
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constraints = [NSMutableSet set];
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objc_setAssociatedObject(self, &kInstalledConstraintsKey, constraints, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
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}
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return constraints;
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}
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@end
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@interface MASViewConstraint ()
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@property (nonatomic, strong, readwrite) MASViewAttribute *secondViewAttribute;
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@property (nonatomic, weak) MAS_VIEW *installedView;
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@property (nonatomic, weak) MASLayoutConstraint *layoutConstraint;
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@property (nonatomic, assign) NSLayoutRelation layoutRelation;
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@property (nonatomic, assign) MASLayoutPriority layoutPriority;
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@property (nonatomic, assign) CGFloat layoutMultiplier;
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@property (nonatomic, assign) CGFloat layoutConstant;
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@property (nonatomic, assign) BOOL hasLayoutRelation;
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@property (nonatomic, strong) id mas_key;
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@property (nonatomic, assign) BOOL useAnimator;
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@end
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@implementation MASViewConstraint
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- (id)initWithFirstViewAttribute:(MASViewAttribute *)firstViewAttribute {
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self = [super init];
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if (!self) return nil;
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_firstViewAttribute = firstViewAttribute;
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self.layoutPriority = MASLayoutPriorityRequired;
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self.layoutMultiplier = 1;
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return self;
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}
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#pragma mark - NSCoping
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- (id)copyWithZone:(NSZone __unused *)zone {
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MASViewConstraint *constraint = [[MASViewConstraint alloc] initWithFirstViewAttribute:self.firstViewAttribute];
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constraint.layoutConstant = self.layoutConstant;
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constraint.layoutRelation = self.layoutRelation;
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constraint.layoutPriority = self.layoutPriority;
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constraint.layoutMultiplier = self.layoutMultiplier;
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constraint.delegate = self.delegate;
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return constraint;
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}
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#pragma mark - Public
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+ (NSArray *)installedConstraintsForView:(MAS_VIEW *)view {
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return [view.mas_installedConstraints allObjects];
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}
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#pragma mark - Private
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- (void)setLayoutConstant:(CGFloat)layoutConstant {
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_layoutConstant = layoutConstant;
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#if TARGET_OS_MAC && !(TARGET_OS_IPHONE || TARGET_OS_TV)
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if (self.useAnimator) {
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[self.layoutConstraint.animator setConstant:layoutConstant];
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} else {
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self.layoutConstraint.constant = layoutConstant;
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}
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#else
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self.layoutConstraint.constant = layoutConstant;
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#endif
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}
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- (void)setLayoutRelation:(NSLayoutRelation)layoutRelation {
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_layoutRelation = layoutRelation;
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self.hasLayoutRelation = YES;
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}
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- (BOOL)supportsActiveProperty {
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return [self.layoutConstraint respondsToSelector:@selector(isActive)];
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}
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- (BOOL)isActive {
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BOOL active = YES;
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if ([self supportsActiveProperty]) {
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active = [self.layoutConstraint isActive];
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}
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return active;
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}
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- (BOOL)hasBeenInstalled {
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return (self.layoutConstraint != nil) && [self isActive];
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}
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- (void)setSecondViewAttribute:(id)secondViewAttribute {
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if ([secondViewAttribute isKindOfClass:NSValue.class]) {
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[self setLayoutConstantWithValue:secondViewAttribute];
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} else if ([secondViewAttribute isKindOfClass:MAS_VIEW.class]) {
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_secondViewAttribute = [[MASViewAttribute alloc] initWithView:secondViewAttribute layoutAttribute:self.firstViewAttribute.layoutAttribute];
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} else if ([secondViewAttribute isKindOfClass:MASViewAttribute.class]) {
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_secondViewAttribute = secondViewAttribute;
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} else {
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NSAssert(NO, @"attempting to add unsupported attribute: %@", secondViewAttribute);
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}
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}
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#pragma mark - NSLayoutConstraint multiplier proxies
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- (MASConstraint * (^)(CGFloat))multipliedBy {
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return ^id(CGFloat multiplier) {
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NSAssert(!self.hasBeenInstalled,
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@"Cannot modify constraint multiplier after it has been installed");
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self.layoutMultiplier = multiplier;
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return self;
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};
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}
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- (MASConstraint * (^)(CGFloat))dividedBy {
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return ^id(CGFloat divider) {
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NSAssert(!self.hasBeenInstalled,
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@"Cannot modify constraint multiplier after it has been installed");
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self.layoutMultiplier = 1.0/divider;
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return self;
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};
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}
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#pragma mark - MASLayoutPriority proxy
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- (MASConstraint * (^)(MASLayoutPriority))priority {
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return ^id(MASLayoutPriority priority) {
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NSAssert(!self.hasBeenInstalled,
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@"Cannot modify constraint priority after it has been installed");
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self.layoutPriority = priority;
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return self;
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};
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}
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#pragma mark - NSLayoutRelation proxy
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- (MASConstraint * (^)(id, NSLayoutRelation))equalToWithRelation {
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return ^id(id attribute, NSLayoutRelation relation) {
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if ([attribute isKindOfClass:NSArray.class]) {
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NSAssert(!self.hasLayoutRelation, @"Redefinition of constraint relation");
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NSMutableArray *children = NSMutableArray.new;
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for (id attr in attribute) {
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MASViewConstraint *viewConstraint = [self copy];
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viewConstraint.layoutRelation = relation;
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viewConstraint.secondViewAttribute = attr;
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[children addObject:viewConstraint];
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}
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MASCompositeConstraint *compositeConstraint = [[MASCompositeConstraint alloc] initWithChildren:children];
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compositeConstraint.delegate = self.delegate;
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[self.delegate constraint:self shouldBeReplacedWithConstraint:compositeConstraint];
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return compositeConstraint;
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} else {
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NSAssert(!self.hasLayoutRelation || self.layoutRelation == relation && [attribute isKindOfClass:NSValue.class], @"Redefinition of constraint relation");
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self.layoutRelation = relation;
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self.secondViewAttribute = attribute;
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return self;
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}
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};
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}
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#pragma mark - Semantic properties
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- (MASConstraint *)with {
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return self;
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}
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- (MASConstraint *)and {
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return self;
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}
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#pragma mark - attribute chaining
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- (MASConstraint *)addConstraintWithLayoutAttribute:(NSLayoutAttribute)layoutAttribute {
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NSAssert(!self.hasLayoutRelation, @"Attributes should be chained before defining the constraint relation");
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return [self.delegate constraint:self addConstraintWithLayoutAttribute:layoutAttribute];
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}
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#pragma mark - Animator proxy
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#if TARGET_OS_MAC && !(TARGET_OS_IPHONE || TARGET_OS_TV)
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- (MASConstraint *)animator {
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self.useAnimator = YES;
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return self;
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}
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#endif
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#pragma mark - debug helpers
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- (MASConstraint * (^)(id))key {
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return ^id(id key) {
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self.mas_key = key;
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return self;
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};
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}
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#pragma mark - NSLayoutConstraint constant setters
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- (void)setInsets:(MASEdgeInsets)insets {
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NSLayoutAttribute layoutAttribute = self.firstViewAttribute.layoutAttribute;
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switch (layoutAttribute) {
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case NSLayoutAttributeLeft:
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case NSLayoutAttributeLeading:
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self.layoutConstant = insets.left;
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break;
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case NSLayoutAttributeTop:
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self.layoutConstant = insets.top;
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break;
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case NSLayoutAttributeBottom:
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self.layoutConstant = -insets.bottom;
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break;
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case NSLayoutAttributeRight:
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case NSLayoutAttributeTrailing:
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self.layoutConstant = -insets.right;
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break;
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default:
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break;
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}
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}
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- (void)setOffset:(CGFloat)offset {
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self.layoutConstant = offset;
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}
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- (void)setSizeOffset:(CGSize)sizeOffset {
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NSLayoutAttribute layoutAttribute = self.firstViewAttribute.layoutAttribute;
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switch (layoutAttribute) {
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case NSLayoutAttributeWidth:
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self.layoutConstant = sizeOffset.width;
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break;
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case NSLayoutAttributeHeight:
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self.layoutConstant = sizeOffset.height;
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break;
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default:
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break;
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}
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}
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- (void)setCenterOffset:(CGPoint)centerOffset {
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NSLayoutAttribute layoutAttribute = self.firstViewAttribute.layoutAttribute;
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switch (layoutAttribute) {
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case NSLayoutAttributeCenterX:
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self.layoutConstant = centerOffset.x;
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break;
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case NSLayoutAttributeCenterY:
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self.layoutConstant = centerOffset.y;
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break;
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default:
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break;
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}
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}
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#pragma mark - MASConstraint
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- (void)activate {
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[self install];
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}
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- (void)deactivate {
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[self uninstall];
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}
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- (void)install {
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if (self.hasBeenInstalled) {
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return;
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}
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if ([self supportsActiveProperty] && self.layoutConstraint) {
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self.layoutConstraint.active = YES;
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[self.firstViewAttribute.view.mas_installedConstraints addObject:self];
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return;
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}
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MAS_VIEW *firstLayoutItem = self.firstViewAttribute.item;
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NSLayoutAttribute firstLayoutAttribute = self.firstViewAttribute.layoutAttribute;
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MAS_VIEW *secondLayoutItem = self.secondViewAttribute.item;
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NSLayoutAttribute secondLayoutAttribute = self.secondViewAttribute.layoutAttribute;
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// alignment attributes must have a secondViewAttribute
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// therefore we assume that is refering to superview
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// eg make.left.equalTo(@10)
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if (!self.firstViewAttribute.isSizeAttribute && !self.secondViewAttribute) {
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secondLayoutItem = self.firstViewAttribute.view.superview;
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secondLayoutAttribute = firstLayoutAttribute;
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}
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MASLayoutConstraint *layoutConstraint
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= [MASLayoutConstraint constraintWithItem:firstLayoutItem
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attribute:firstLayoutAttribute
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relatedBy:self.layoutRelation
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toItem:secondLayoutItem
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attribute:secondLayoutAttribute
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multiplier:self.layoutMultiplier
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constant:self.layoutConstant];
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layoutConstraint.priority = self.layoutPriority;
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layoutConstraint.mas_key = self.mas_key;
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if (self.secondViewAttribute.view) {
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MAS_VIEW *closestCommonSuperview = [self.firstViewAttribute.view mas_closestCommonSuperview:self.secondViewAttribute.view];
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NSAssert(closestCommonSuperview,
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@"couldn't find a common superview for %@ and %@",
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self.firstViewAttribute.view, self.secondViewAttribute.view);
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self.installedView = closestCommonSuperview;
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} else if (self.firstViewAttribute.isSizeAttribute) {
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self.installedView = self.firstViewAttribute.view;
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} else {
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self.installedView = self.firstViewAttribute.view.superview;
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}
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MASLayoutConstraint *existingConstraint = nil;
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if (self.updateExisting) {
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existingConstraint = [self layoutConstraintSimilarTo:layoutConstraint];
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}
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if (existingConstraint) {
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// just update the constant
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existingConstraint.constant = layoutConstraint.constant;
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self.layoutConstraint = existingConstraint;
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} else {
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[self.installedView addConstraint:layoutConstraint];
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self.layoutConstraint = layoutConstraint;
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[firstLayoutItem.mas_installedConstraints addObject:self];
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}
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}
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- (MASLayoutConstraint *)layoutConstraintSimilarTo:(MASLayoutConstraint *)layoutConstraint {
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// check if any constraints are the same apart from the only mutable property constant
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// go through constraints in reverse as we do not want to match auto-resizing or interface builder constraints
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// and they are likely to be added first.
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for (NSLayoutConstraint *existingConstraint in self.installedView.constraints.reverseObjectEnumerator) {
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if (![existingConstraint isKindOfClass:MASLayoutConstraint.class]) continue;
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if (existingConstraint.firstItem != layoutConstraint.firstItem) continue;
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if (existingConstraint.secondItem != layoutConstraint.secondItem) continue;
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if (existingConstraint.firstAttribute != layoutConstraint.firstAttribute) continue;
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if (existingConstraint.secondAttribute != layoutConstraint.secondAttribute) continue;
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if (existingConstraint.relation != layoutConstraint.relation) continue;
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if (existingConstraint.multiplier != layoutConstraint.multiplier) continue;
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if (existingConstraint.priority != layoutConstraint.priority) continue;
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return (id)existingConstraint;
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}
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return nil;
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}
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- (void)uninstall {
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if ([self supportsActiveProperty]) {
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self.layoutConstraint.active = NO;
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[self.firstViewAttribute.view.mas_installedConstraints removeObject:self];
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return;
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}
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[self.installedView removeConstraint:self.layoutConstraint];
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self.layoutConstraint = nil;
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self.installedView = nil;
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[self.firstViewAttribute.view.mas_installedConstraints removeObject:self];
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}
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@end
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