| // Copyright 2016-present the Material Components for iOS authors. All Rights Reserved. |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| #import <UIKit/UIKit.h> |
| |
| #import "ShadowElevationsPointsLabel.h" |
| |
| #import "MaterialMath.h" |
| #import "MaterialShadowElevations.h" |
| #import "MaterialSlider.h" |
| |
| static NSString *const kDefaultShadowElevationLabelString = @""; |
| |
| static const CGFloat kShadowElevationLabelTopOffset = 0; |
| static const CGFloat kShadowElevationLabelHeight = 70; |
| static const CGFloat kShadowElevationsDefault = 8; |
| static const CGFloat kShadowElevationsMax = 24; |
| static const CGFloat kShadowElevationsSliderFrameHeight = 27; |
| static const CGFloat kShadowElevationsSliderFrameMargin = 20; |
| static const CGFloat kShadowElevationsElementSpace = 20; |
| static const CGFloat kShadowElevationsPaperDimRange = 130; |
| static const CGFloat kShadowElevationsPaperBottomMargin = 20; |
| |
| @interface ShadowElevationsPointsView : UIView <MDCSliderDelegate> |
| |
| @property(nonatomic) ShadowElevationsPointsLabel *paper; |
| @property(nonatomic) UILabel *elevationLabel; |
| @property(nonatomic) MDCSlider *sliderControl; |
| |
| @end |
| |
| @implementation ShadowElevationsPointsView |
| |
| - (id)initWithFrame:(CGRect)frame { |
| self = [super initWithFrame:frame]; |
| if (self) { |
| self.backgroundColor = [UIColor whiteColor]; |
| |
| // Add label |
| _elevationLabel = |
| [[UILabel alloc] initWithFrame:CGRectMake(0, kShadowElevationLabelTopOffset, |
| frame.size.width, kShadowElevationLabelHeight)]; |
| _elevationLabel.textAlignment = NSTextAlignmentCenter; |
| _elevationLabel.text = |
| [[self class] elevationStringForShadowElevationValue:kShadowElevationsDefault]; |
| [self addSubview:_elevationLabel]; |
| |
| // Add slider control |
| self.sliderControl = [[MDCSlider alloc] initWithFrame:CGRectZero]; |
| self.sliderControl.numberOfDiscreteValues = (NSUInteger)kShadowElevationsMax + 1; |
| self.sliderControl.maximumValue = kShadowElevationsMax; |
| self.sliderControl.value = kShadowElevationsDefault; |
| self.sliderControl.delegate = self; |
| self.sliderControl.translatesAutoresizingMaskIntoConstraints = NO; |
| self.sliderControl.accessibilityLabel = @"Displayed shadow elevation"; |
| [self.sliderControl addTarget:self |
| action:@selector(sliderValueChanged:) |
| forControlEvents:UIControlEventValueChanged]; |
| [self addSubview:self.sliderControl]; |
| |
| [NSLayoutConstraint constraintWithItem:self.sliderControl |
| attribute:NSLayoutAttributeTop |
| relatedBy:NSLayoutRelationEqual |
| toItem:_elevationLabel |
| attribute:NSLayoutAttributeBottom |
| multiplier:1.0 |
| constant:kShadowElevationsElementSpace] |
| .active = YES; |
| [NSLayoutConstraint constraintWithItem:self.sliderControl |
| attribute:NSLayoutAttributeHeight |
| relatedBy:NSLayoutRelationEqual |
| toItem:nil |
| attribute:NSLayoutAttributeNotAnAttribute |
| multiplier:1.0 |
| constant:kShadowElevationsSliderFrameHeight] |
| .active = YES; |
| [NSLayoutConstraint constraintWithItem:self.sliderControl |
| attribute:NSLayoutAttributeLeftMargin |
| relatedBy:NSLayoutRelationEqual |
| toItem:self |
| attribute:NSLayoutAttributeLeftMargin |
| multiplier:1.0 |
| constant:kShadowElevationsSliderFrameMargin] |
| .active = YES; |
| [NSLayoutConstraint constraintWithItem:self.sliderControl |
| attribute:NSLayoutAttributeRightMargin |
| relatedBy:NSLayoutRelationEqual |
| toItem:self |
| attribute:NSLayoutAttributeRightMargin |
| multiplier:1.0 |
| constant:-kShadowElevationsSliderFrameMargin] |
| .active = YES; |
| |
| // Add paper |
| _paper = [[ShadowElevationsPointsLabel alloc] initWithFrame:CGRectZero]; |
| _paper.translatesAutoresizingMaskIntoConstraints = NO; |
| _paper.textAlignment = NSTextAlignmentCenter; |
| _paper.text = [NSString stringWithFormat:@"%ld pt", (long)kShadowElevationsDefault]; |
| _paper.elevation = kShadowElevationsDefault; |
| [self addSubview:_paper]; |
| [NSLayoutConstraint constraintWithItem:_paper |
| attribute:NSLayoutAttributeCenterX |
| relatedBy:NSLayoutRelationEqual |
| toItem:self |
| attribute:NSLayoutAttributeCenterX |
| multiplier:1.0 |
| constant:0] |
| .active = YES; |
| [NSLayoutConstraint constraintWithItem:_paper |
| attribute:NSLayoutAttributeTop |
| relatedBy:NSLayoutRelationEqual |
| toItem:self.sliderControl |
| attribute:NSLayoutAttributeBottom |
| multiplier:1.0 |
| constant:kShadowElevationsElementSpace] |
| .active = YES; |
| [NSLayoutConstraint constraintWithItem:_paper |
| attribute:NSLayoutAttributeBottom |
| relatedBy:NSLayoutRelationLessThanOrEqual |
| toItem:self |
| attribute:NSLayoutAttributeBottom |
| multiplier:1.0 |
| constant:kShadowElevationsPaperBottomMargin] |
| .active = YES; |
| [NSLayoutConstraint constraintWithItem:_paper |
| attribute:NSLayoutAttributeWidth |
| relatedBy:NSLayoutRelationEqual |
| toItem:_paper |
| attribute:NSLayoutAttributeHeight |
| multiplier:1.0 |
| constant:0] |
| .active = YES; |
| [NSLayoutConstraint constraintWithItem:_paper |
| attribute:NSLayoutAttributeWidth |
| relatedBy:NSLayoutRelationGreaterThanOrEqual |
| toItem:nil |
| attribute:NSLayoutAttributeNotAnAttribute |
| multiplier:1.0 |
| constant:kShadowElevationsPaperDimRange] |
| .active = YES; |
| } |
| return self; |
| } |
| |
| #pragma mark - MDCSliderDelegate methods |
| |
| - (NSString *)slider:(MDCSlider *)slider displayedStringForValue:(CGFloat)value { |
| NSInteger points = (NSInteger)round(value); |
| return [NSString stringWithFormat:@"%ld pt", (long)points]; |
| } |
| |
| - (void)sliderValueChanged:(MDCSlider *)slider { |
| MDCShadowElevation points = [self shadowElevationFromSliderValue:slider.value]; |
| self.paper.text = [NSString stringWithFormat:@"%ld pt", (long)points]; |
| self.paper.elevation = points; |
| self.elevationLabel.text = [[self class] elevationStringForShadowElevationValue:points]; |
| } |
| |
| - (NSString *)slider:(MDCSlider *)slider accessibilityLabelForValue:(CGFloat)value { |
| MDCShadowElevation points = [self shadowElevationFromSliderValue:slider.value]; |
| NSString *elevationName = [[self class] elevationStringForShadowElevationValue:points]; |
| if (elevationName.length > 0) { |
| return elevationName; |
| } else { |
| return [NSString stringWithFormat:@"Unlabeled elevation of %@", @((NSInteger)points)]; |
| } |
| } |
| |
| #pragma mark - Internal methods |
| |
| - (MDCShadowElevation)shadowElevationFromSliderValue:(CGFloat)sliderValue { |
| return round(sliderValue); |
| } |
| |
| + (NSString *)elevationStringForShadowElevationValue:(MDCShadowElevation)shadowElevationValue { |
| NSString *elevationString = kDefaultShadowElevationLabelString; |
| |
| if (MDCCGFloatEqual(shadowElevationValue, MDCShadowElevationNone)) { |
| elevationString = @"MDCShadowElevationNone"; |
| } else if (MDCCGFloatEqual(shadowElevationValue, MDCShadowElevationSwitch)) { |
| elevationString = @"MDCShadowElevationSwitch"; |
| } else if (MDCCGFloatEqual(shadowElevationValue, MDCShadowElevationRaisedButtonResting)) { |
| elevationString = @"MDCShadowElevationRaisedButtonResting"; |
| } else if (MDCCGFloatEqual(shadowElevationValue, MDCShadowElevationRefresh)) { |
| elevationString = @"MDCShadowElevationRefresh"; |
| } else if (MDCCGFloatEqual(shadowElevationValue, MDCShadowElevationAppBar)) { |
| elevationString = @"MDCShadowElevationAppBar"; |
| } else if (MDCCGFloatEqual(shadowElevationValue, MDCShadowElevationFABResting)) { |
| elevationString = @"MDCShadowElevationFABResting"; |
| } else if (MDCCGFloatEqual(shadowElevationValue, MDCShadowElevationRaisedButtonPressed)) { |
| elevationString = @"MDCShadowElevationRaisedButtonPressed"; |
| } else if (MDCCGFloatEqual(shadowElevationValue, MDCShadowElevationSubMenu)) { |
| elevationString = @"MDCShadowElevationSubMenu"; |
| } else if (MDCCGFloatEqual(shadowElevationValue, MDCShadowElevationFABPressed)) { |
| elevationString = @"MDCShadowElevationFABPressed"; |
| } else if (MDCCGFloatEqual(shadowElevationValue, MDCShadowElevationNavDrawer)) { |
| elevationString = @"MDCShadowElevationNavDrawer"; |
| } else if (MDCCGFloatEqual(shadowElevationValue, MDCShadowElevationDialog)) { |
| elevationString = @"MDCShadowElevationDialog"; |
| } |
| |
| return elevationString; |
| } |
| |
| @end |
| |
| @interface ShadowElevationsTypicalUseViewController : UIViewController |
| @property(nonatomic) ShadowElevationsPointsView *shadowsView; |
| @end |
| |
| @implementation ShadowElevationsTypicalUseViewController |
| |
| - (void)viewDidLoad { |
| [super viewDidLoad]; |
| self.view.backgroundColor = [UIColor whiteColor]; |
| self.title = @"Shadow Elevations"; |
| _shadowsView = [[ShadowElevationsPointsView alloc] initWithFrame:self.view.bounds]; |
| [self.view addSubview:_shadowsView]; |
| |
| self.shadowsView.autoresizingMask = |
| UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight; |
| } |
| |
| - (void)setupShadowsViewConstraints { |
| [NSLayoutConstraint constraintWithItem:self.shadowsView |
| attribute:NSLayoutAttributeTop |
| relatedBy:NSLayoutRelationEqual |
| toItem:self.topLayoutGuide |
| attribute:NSLayoutAttributeBottom |
| multiplier:1.0 |
| constant:0] |
| .active = YES; |
| |
| [NSLayoutConstraint constraintWithItem:self.shadowsView |
| attribute:NSLayoutAttributeLeading |
| relatedBy:NSLayoutRelationEqual |
| toItem:self.view |
| attribute:NSLayoutAttributeLeading |
| multiplier:1.0 |
| constant:0] |
| .active = YES; |
| |
| [NSLayoutConstraint constraintWithItem:self.shadowsView |
| attribute:NSLayoutAttributeWidth |
| relatedBy:NSLayoutRelationEqual |
| toItem:self.view |
| attribute:NSLayoutAttributeWidth |
| multiplier:1.0 |
| constant:0] |
| .active = YES; |
| |
| [NSLayoutConstraint constraintWithItem:self.shadowsView |
| attribute:NSLayoutAttributeBottom |
| relatedBy:NSLayoutRelationEqual |
| toItem:self.bottomLayoutGuide |
| attribute:NSLayoutAttributeTop |
| multiplier:1.0 |
| constant:0] |
| .active = YES; |
| } |
| |
| - (void)viewSafeAreaInsetsDidChange { |
| [super viewSafeAreaInsetsDidChange]; |
| CGRect insetedShadowViewFrame = CGRectMake( |
| self.view.bounds.origin.x, self.view.bounds.origin.y + self.view.safeAreaInsets.top, |
| self.view.bounds.size.width - self.view.safeAreaInsets.left - self.view.safeAreaInsets.right, |
| self.view.bounds.size.height - self.view.safeAreaInsets.top - |
| self.view.safeAreaInsets.bottom); |
| self.shadowsView.frame = insetedShadowViewFrame; |
| } |
| |
| #pragma mark catalog by convention |
| |
| + (NSDictionary *)catalogMetadata { |
| return @{ |
| @"breadcrumbs" : @[ @"Shadow", @"Shadow Elevations" ], |
| @"primaryDemo" : @NO, |
| @"presentable" : @YES, |
| }; |
| } |
| |
| @end |
