| // Copyright 2018-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 "MDCChipTextFieldScrollView.h" |
| |
| @interface MDCChipTextFieldScrollView () |
| |
| @property(nonatomic, readwrite, strong) UIView *contentView; |
| |
| @property(nonatomic, readwrite, weak) NSLayoutConstraint *trailingConstraint; |
| |
| @end |
| |
| @implementation MDCChipTextFieldScrollView |
| @synthesize delegate = _delegate; |
| |
| - (instancetype)initWithFrame:(CGRect)frame { |
| if ((self = [super initWithFrame:frame])) { |
| [self commonInit]; |
| } |
| return self; |
| } |
| |
| - (instancetype)initWithCoder:(NSCoder *)aDecoder { |
| if ((self = [super initWithCoder:aDecoder])) { |
| [self commonInit]; |
| } |
| return self; |
| } |
| |
| - (void)commonInit { |
| // set up content view |
| UIView *contentView = [[UIView alloc] initWithFrame:self.frame]; |
| contentView.translatesAutoresizingMaskIntoConstraints = NO; |
| [self addSubview:contentView]; |
| self.contentView = contentView; |
| |
| NSLayoutConstraint *contentConstraintTop = |
| [NSLayoutConstraint constraintWithItem:contentView |
| attribute:NSLayoutAttributeTop |
| relatedBy:NSLayoutRelationEqual |
| toItem:self |
| attribute:NSLayoutAttributeTop |
| multiplier:1 |
| constant:0]; |
| NSLayoutConstraint *contentConstraintBottom = |
| [NSLayoutConstraint constraintWithItem:contentView |
| attribute:NSLayoutAttributeBottom |
| relatedBy:NSLayoutRelationEqual |
| toItem:self |
| attribute:NSLayoutAttributeBottom |
| multiplier:1 |
| constant:0]; |
| NSLayoutConstraint *contentConstraintLeading = |
| [NSLayoutConstraint constraintWithItem:contentView |
| attribute:NSLayoutAttributeLeading |
| relatedBy:NSLayoutRelationEqual |
| toItem:self |
| attribute:NSLayoutAttributeLeading |
| multiplier:1 |
| constant:0]; |
| NSLayoutConstraint *contentConstraintTrailing = |
| [NSLayoutConstraint constraintWithItem:contentView |
| attribute:NSLayoutAttributeTrailing |
| relatedBy:NSLayoutRelationEqual |
| toItem:self |
| attribute:NSLayoutAttributeTrailing |
| multiplier:1 |
| constant:0]; |
| contentConstraintTrailing.priority = UILayoutPriorityDefaultLow; |
| NSLayoutConstraint *contentConstraintHeight = |
| [NSLayoutConstraint constraintWithItem:contentView |
| attribute:NSLayoutAttributeHeight |
| relatedBy:NSLayoutRelationEqual |
| toItem:self |
| attribute:NSLayoutAttributeHeight |
| multiplier:1 |
| constant:0]; |
| NSLayoutConstraint *contentConstraintWidth = |
| [NSLayoutConstraint constraintWithItem:contentView |
| attribute:NSLayoutAttributeWidth |
| relatedBy:NSLayoutRelationEqual |
| toItem:self |
| attribute:NSLayoutAttributeWidth |
| multiplier:1 |
| constant:0]; |
| contentConstraintWidth.priority = UILayoutPriorityDefaultLow; |
| [NSLayoutConstraint activateConstraints:@[ |
| contentConstraintTop, contentConstraintBottom, contentConstraintLeading, |
| contentConstraintTrailing, contentConstraintHeight, contentConstraintWidth |
| ]]; |
| |
| NSLayoutConstraint *contentToChipTrailingConstraint = |
| [NSLayoutConstraint constraintWithItem:contentView |
| attribute:NSLayoutAttributeTrailing |
| relatedBy:NSLayoutRelationEqual |
| toItem:contentView |
| attribute:NSLayoutAttributeLeading |
| multiplier:1 |
| constant:0]; |
| contentToChipTrailingConstraint.active = YES; |
| self.trailingConstraint = contentToChipTrailingConstraint; |
| |
| // Set fixed values for this scroll view. |
| [self setShowsVerticalScrollIndicator:NO]; |
| [self setShowsHorizontalScrollIndicator:NO]; |
| self.bounces = NO; |
| self.scrollEnabled = NO; |
| } |
| |
| - (void)appendChipView:(MDCChipView *)chipView { |
| self.trailingConstraint.active = NO; |
| [self.contentView addSubview:chipView]; |
| NSLayoutConstraint *chipViewConstraintTop = |
| [NSLayoutConstraint constraintWithItem:self.contentView |
| attribute:NSLayoutAttributeTop |
| relatedBy:NSLayoutRelationLessThanOrEqual |
| toItem:chipView |
| attribute:NSLayoutAttributeTop |
| multiplier:1 |
| constant:0]; |
| NSLayoutConstraint *chipViewConstraintBottom = |
| [NSLayoutConstraint constraintWithItem:self.contentView |
| attribute:NSLayoutAttributeBottom |
| relatedBy:NSLayoutRelationGreaterThanOrEqual |
| toItem:chipView |
| attribute:NSLayoutAttributeBottom |
| multiplier:1 |
| constant:0]; |
| NSLayoutConstraint *chipViewConstraintCenterY = |
| [NSLayoutConstraint constraintWithItem:self.contentView |
| attribute:NSLayoutAttributeCenterY |
| relatedBy:NSLayoutRelationEqual |
| toItem:chipView |
| attribute:NSLayoutAttributeCenterY |
| multiplier:1 |
| constant:0]; |
| |
| NSLayoutConstraint *chipViewConstraintLeading = nil; |
| NSInteger numberOfChips = [self.dataSource numberOfChipsInScrollView:self]; |
| // The left most chip is always done before all other chips are added right now, |
| // we should remove the assumption when moving to Beta |
| if (numberOfChips == 0) { |
| chipViewConstraintLeading = [NSLayoutConstraint constraintWithItem:self.contentView |
| attribute:NSLayoutAttributeLeading |
| relatedBy:NSLayoutRelationEqual |
| toItem:chipView |
| attribute:NSLayoutAttributeLeading |
| multiplier:1 |
| constant:0]; |
| } else { |
| MDCChipView *lastChipView = [self.dataSource scrollView:self chipForIndex:numberOfChips - 1]; |
| chipViewConstraintLeading = [NSLayoutConstraint constraintWithItem:chipView |
| attribute:NSLayoutAttributeLeading |
| relatedBy:NSLayoutRelationEqual |
| toItem:lastChipView |
| attribute:NSLayoutAttributeTrailing |
| multiplier:1 |
| constant:self.chipSpacing]; |
| } |
| NSLayoutConstraint *chipViewConstraintTrailing = |
| [NSLayoutConstraint constraintWithItem:self.contentView |
| attribute:NSLayoutAttributeTrailing |
| relatedBy:NSLayoutRelationEqual |
| toItem:chipView |
| attribute:NSLayoutAttributeTrailing |
| multiplier:1 |
| constant:0]; |
| [NSLayoutConstraint activateConstraints:@[ |
| chipViewConstraintTop, chipViewConstraintBottom, chipViewConstraintCenterY, |
| chipViewConstraintLeading, chipViewConstraintTrailing |
| ]]; |
| self.trailingConstraint = chipViewConstraintTrailing; |
| |
| // Add touch handler |
| [chipView addTarget:self |
| action:@selector(didTapChipView:) |
| forControlEvents:UIControlEventTouchUpInside]; |
| } |
| |
| - (void)removeChipView:(MDCChipView *)chipView { |
| [chipView removeFromSuperview]; |
| |
| NSInteger numberOfChips = [self.dataSource numberOfChipsInScrollView:self]; |
| if (numberOfChips > 0) { |
| MDCChipView *lastChipView = [self.dataSource scrollView:self chipForIndex:numberOfChips - 1]; |
| NSLayoutConstraint *chipViewConstraintTrailing = |
| [NSLayoutConstraint constraintWithItem:self.contentView |
| attribute:NSLayoutAttributeTrailing |
| relatedBy:NSLayoutRelationEqual |
| toItem:lastChipView |
| attribute:NSLayoutAttributeTrailing |
| multiplier:1 |
| constant:0]; |
| chipViewConstraintTrailing.active = YES; |
| self.trailingConstraint = chipViewConstraintTrailing; |
| } |
| } |
| |
| - (void)scrollToLeft { |
| self.contentOffset = CGPointMake(0.0f, self.contentOffset.y); |
| } |
| |
| - (void)scrollToRight { |
| self.contentOffset = |
| CGPointMake(self.contentSize.width - self.bounds.size.width, self.contentOffset.y); |
| } |
| |
| - (void)layoutSubviews { |
| [super layoutSubviews]; |
| |
| self.contentSize = self.contentView.frame.size; |
| } |
| |
| #pragma mark - Touch Handlers |
| |
| - (void)didTapChipView:(id)sender { |
| MDCChipView *chipView = (MDCChipView *)sender; |
| if ([self.touchDelegate respondsToSelector:@selector(chipTextFieldScrollView:didTapChipView:)]) { |
| [self.touchDelegate chipTextFieldScrollView:self didTapChipView:chipView]; |
| } |
| } |
| |
| @end |
