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// The MIT License (MIT)
//
// Copyright (c) 2015-2016 forkingdog ( https://github.com/forkingdog )
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
#import "FDStackView.h"
#import <objc/runtime.h>
#import "FDTransformLayer.h"
#import "FDStackViewAlignmentLayoutArrangement.h"
#import "FDStackViewDistributionLayoutArrangement.h"
@interface FDStackView ()
@property (nonatomic, strong) NSMutableArray *mutableArrangedSubviews;
@property (nonatomic, strong) FDStackViewAlignmentLayoutArrangement *alignmentArrangement;
@property (nonatomic, strong) FDStackViewDistributionLayoutArrangement *distributionArrangement;
@end
@implementation FDStackView
+ (Class)layerClass {
return FDTransformLayer.class;
}
- (id)initWithCoder:(NSCoder *)decoder {
self = [super initWithCoder:decoder];
if (self) {
// Attributes of UIStackView in interface builder that archived.
[self commonInitializationWithArrangedSubviews:[decoder decodeObjectForKey:@"UIStackViewArrangedSubviews"]];
self.axis = [decoder decodeIntegerForKey:@"UIStackViewAxis"];
self.distribution = [decoder decodeIntegerForKey:@"UIStackViewDistribution"];
self.alignment = [decoder decodeIntegerForKey:@"UIStackViewAlignment"];
self.spacing = [decoder decodeDoubleForKey:@"UIStackViewSpacing"];
self.baselineRelativeArrangement = [decoder decodeBoolForKey:@"UIStackViewBaselineRelative"];
self.layoutMarginsRelativeArrangement = [decoder decodeBoolForKey:@"UIStackViewLayoutMarginsRelative"];
}
return self;
}
- (instancetype)initWithArrangedSubviews:(NSArray<__kindof UIView *> *)views {
self = [super initWithFrame:CGRectZero];
if (self) {
[self commonInitializationWithArrangedSubviews:views];
}
return self;
}
- (instancetype)initWithFrame:(CGRect)frame {
self = [super initWithFrame:frame];
if (self) {
[self commonInitializationWithArrangedSubviews:nil];
}
return self;
}
- (void)commonInitializationWithArrangedSubviews:(NSArray<__kindof UIView *> *)arrangedSubviews {
self.mutableArrangedSubviews = (arrangedSubviews ?: @[]).mutableCopy;
for (UIView *view in self.mutableArrangedSubviews) {
[self addHiddenObserverForView:view];
}
self.distributionArrangement = [[FDStackViewDistributionLayoutArrangement alloc] initWithItems:arrangedSubviews onAxis:self.axis];
self.distributionArrangement.canvas = self;
self.alignmentArrangement = [[FDStackViewAlignmentLayoutArrangement alloc] initWithItems:arrangedSubviews onAxis:self.axis];
self.alignmentArrangement.canvas = self;
for (UIView *view in arrangedSubviews) {
view.translatesAutoresizingMaskIntoConstraints = NO;
[self addSubview:view];
}
}
#pragma mark - Public Arranged Subviews Operations
- (NSArray<UIView *> *)arrangedSubviews {
return self.mutableArrangedSubviews.copy;
}
- (void)addArrangedSubview:(UIView *)view {
if (!view || [self.mutableArrangedSubviews containsObject:view]) {
return;
}
[self addSubview:view];
view.translatesAutoresizingMaskIntoConstraints = NO;
[self.mutableArrangedSubviews addObject:view];
[self.alignmentArrangement addItem:view];
[self.distributionArrangement addItem:view];
[self addHiddenObserverForView:view];
[self updateLayoutArrangements];
}
- (void)removeArrangedSubview:(UIView *)view {
if (![self.mutableArrangedSubviews containsObject:view] || ![view isDescendantOfView:self]) {
return;
}
[self removeHiddenObserverForView:view];
[self.mutableArrangedSubviews removeObject:view];
[view removeFromSuperview];
[self.alignmentArrangement removeItem:view];
[self.distributionArrangement removeItem:view];
[self updateLayoutArrangements];
}
- (void)insertArrangedSubview:(UIView *)view atIndex:(NSUInteger)stackIndex {
if (!view || [self.mutableArrangedSubviews containsObject:view]) {
return;
}
view.translatesAutoresizingMaskIntoConstraints = NO;
[self insertSubview:view atIndex:stackIndex];
[self.mutableArrangedSubviews insertObject:view atIndex:stackIndex];
[self.alignmentArrangement insertItem:view atIndex:stackIndex];
[self.distributionArrangement insertItem:view atIndex:stackIndex];
[self addHiddenObserverForView:view];
[self updateLayoutArrangements];
}
#pragma mark - Public Setters
- (void)setAxis:(UILayoutConstraintAxis)axis {
if (_axis != axis) {
_axis = axis;
self.distributionArrangement.axis = axis;
self.alignmentArrangement.axis = axis;
[self updateLayoutArrangements];
}
}
- (void)setDistribution:(UIStackViewDistribution)distribution {
if (_distribution != distribution) {
_distribution = distribution;
self.distributionArrangement.distribution = distribution;
[self updateLayoutArrangements];
}
}
- (void)setAlignment:(UIStackViewAlignment)alignment {
if (_alignment != alignment) {
_alignment = alignment;
self.alignmentArrangement.alignment = alignment;
[self updateLayoutArrangements];
}
}
- (void)setSpacing:(CGFloat)spacing {
if (_spacing != spacing) {
_spacing = spacing;
self.distributionArrangement.spacing = spacing;
[self updateLayoutArrangements];
}
}
#pragma mark - Intrinsic Content Size Invalidation
// Use non-public API in UIView directly is dangerous, so we inject at runtime.
+ (void)load {
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
SEL selector = NSSelectorFromString(@"_intrinsicContentSizeInvalidatedForChildView:");
Method method = class_getInstanceMethod(self, @selector(intrinsicContentSizeInvalidatedForChildView:));
class_addMethod(self, selector, method_getImplementation(method), method_getTypeEncoding(method));
});
}
- (void)intrinsicContentSizeInvalidatedForChildView:(UIView *)childView {
[self.distributionArrangement intrinsicContentSizeInvalidatedForItem:childView];
[self.alignmentArrangement intrinsicContentSizeInvalidatedForItem:childView];
}
#pragma mark - Layout
- (void)updateLayoutArrangements {
[self.distributionArrangement removeDeprecatedConstraints];
[self.alignmentArrangement removeDeprecatedConstraints];
[self.distributionArrangement updateArrangementConstraints];
[self.alignmentArrangement updateArrangementConstraints];
}
- (void)updateConstraints {
[self updateLayoutArrangements];
[super updateConstraints];
}
#pragma mark - Hidden KVO
static void *FDStackViewHiddenObservingContext = &FDStackViewHiddenObservingContext;
- (void)addHiddenObserverForView:(UIView *)view {
[view addObserver:self forKeyPath:@"hidden" options:NSKeyValueObservingOptionOld | NSKeyValueObservingOptionNew context:FDStackViewHiddenObservingContext];
}
- (void)removeHiddenObserverForView:(UIView *)view {
[view removeObserver:self forKeyPath:@"hidden" context:FDStackViewHiddenObservingContext];
}
- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(UIView *)view change:(NSDictionary *)change context:(void *)context {
if (context != FDStackViewHiddenObservingContext) {
return;
}
BOOL oldValue = [change[NSKeyValueChangeOldKey] boolValue];
BOOL newValue = [change[NSKeyValueChangeNewKey] boolValue];
if (newValue == oldValue) {
return;
}
[self.alignmentArrangement updateArrangementConstraints];
[self.distributionArrangement updateArrangementConstraints];
}
- (void)dealloc {
for (UIView *view in _mutableArrangedSubviews) {
[self removeHiddenObserverForView:view];
}
}
@end
// ----------------------------------------------------
// Runtime injection start.
// Assemble codes below are based on:
// https://github.com/0xced/NSUUID/blob/master/NSUUID.m
// ----------------------------------------------------
#pragma mark - Runtime Injection
__asm(
".section __DATA,__objc_classrefs,regular,no_dead_strip\n"
#if TARGET_RT_64_BIT
".align 3\n"
"L_OBJC_CLASS_UIStackView:\n"
".quad _OBJC_CLASS_$_UIStackView\n"
#else
".align 2\n"
"_OBJC_CLASS_UIStackView:\n"
".long _OBJC_CLASS_$_UIStackView\n"
#endif
".weak_reference _OBJC_CLASS_$_UIStackView\n"
);
// Constructors are called after all classes have been loaded.
__attribute__((constructor)) static void FDStackViewPatchEntry(void) {
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
@autoreleasepool {
// >= iOS9.
if (objc_getClass("UIStackView")) {
return;
}
Class *stackViewClassLocation = NULL;
#if TARGET_CPU_ARM
__asm("movw %0, :lower16:(_OBJC_CLASS_UIStackView-(LPC0+4))\n"
"movt %0, :upper16:(_OBJC_CLASS_UIStackView-(LPC0+4))\n"
"LPC0: add %0, pc" : "=r"(stackViewClassLocation));
#elif TARGET_CPU_ARM64
__asm("adrp %0, L_OBJC_CLASS_UIStackView@PAGE\n"
"add %0, %0, L_OBJC_CLASS_UIStackView@PAGEOFF" : "=r"(stackViewClassLocation));
#elif TARGET_CPU_X86_64
__asm("leaq L_OBJC_CLASS_UIStackView(%%rip), %0" : "=r"(stackViewClassLocation));
#elif TARGET_CPU_X86
void *pc = NULL;
__asm("calll L0\n"
"L0: popl %0\n"
"leal _OBJC_CLASS_UIStackView-L0(%0), %1" : "=r"(pc), "=r"(stackViewClassLocation));
#else
#error Unsupported CPU
#endif
if (stackViewClassLocation && !*stackViewClassLocation) {
Class class = objc_allocateClassPair(FDStackView.class, "UIStackView", 0);
if (class) {
objc_registerClassPair(class);
*stackViewClassLocation = class;
}
}
}
});
}
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