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[Slider] Move private MDCDiscreteDotView class into its own header an…
…d implementation files. PiperOrigin-RevId: 318375981
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37 changes: 37 additions & 0 deletions
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components/private/ThumbTrack/src/private/MDCDiscreteDotView.h
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| // Copyright 2020-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. | ||
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| #import <UIKit/UIKit.h> | ||
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| // Credit to the Beacon Tools iOS team for the idea for this implementations | ||
| @interface MDCDiscreteDotView : UIView | ||
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| @property(nonatomic, assign) NSUInteger numDiscreteDots; | ||
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| /** The color of dots within the @c activeDotsSegment bounds. Defaults to black. */ | ||
| @property(nonatomic, strong, nonnull) UIColor *activeDotColor; | ||
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| /** The color of dots outside the @c activeDotsSegment bounds. Defaults to black. */ | ||
| @property(nonatomic, strong, nonnull) UIColor *inactiveDotColor; | ||
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| /** | ||
| The segment of the track that uses @c activeDotColor. The horizontal dimension should be bound | ||
| to [0..1]. The vertical dimension is ignored. | ||
| @note Only the @c origin.x and @c size.width are used to determine whether a dot is in the active | ||
| segment. | ||
| */ | ||
| @property(nonatomic, assign) CGRect activeDotsSegment; | ||
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| @end |
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components/private/ThumbTrack/src/private/MDCDiscreteDotView.m
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| // Copyright 2020-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. | ||
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| #import "MDCDiscreteDotView.h" | ||
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| @implementation MDCDiscreteDotView | ||
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| - (instancetype)init { | ||
| self = [super init]; | ||
| if (self) { | ||
| self.backgroundColor = [UIColor clearColor]; | ||
| _inactiveDotColor = UIColor.blackColor; | ||
| _activeDotColor = UIColor.blackColor; | ||
| _activeDotsSegment = CGRectMake(CGFLOAT_MIN, 0, 0, 0); | ||
| } | ||
| return self; | ||
| } | ||
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| - (void)setFrame:(CGRect)frame { | ||
| [super setFrame:frame]; | ||
| [self setNeedsDisplay]; | ||
| } | ||
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| - (void)setActiveDotColor:(UIColor *)activeDotColor { | ||
| _activeDotColor = activeDotColor; | ||
| [self setNeedsDisplay]; | ||
| } | ||
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| - (void)setInactiveDotColor:(UIColor *)inactiveDotColor { | ||
| _inactiveDotColor = inactiveDotColor; | ||
| [self setNeedsDisplay]; | ||
| } | ||
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| - (void)setActiveDotsSegment:(CGRect)activeDotsSegment { | ||
| CGFloat newMinX = MAX(0, MIN(1, CGRectGetMinX(activeDotsSegment))); | ||
| CGFloat newMaxX = MIN(1, MAX(0, CGRectGetMaxX(activeDotsSegment))); | ||
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| _activeDotsSegment = CGRectMake(newMinX, 0, (newMaxX - newMinX), 0); | ||
| [self setNeedsDisplay]; | ||
| } | ||
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| - (void)drawRect:(CGRect)rect { | ||
| [super drawRect:rect]; | ||
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| if (_numDiscreteDots >= 2) { | ||
| CGContextRef contextRef = UIGraphicsGetCurrentContext(); | ||
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| // The "dot" is a circle that gradually transforms into a rounded rectangle. | ||
| // * At 1- and 2-point track heights, use a circle filling the height. | ||
| // * At 3- and 4-point track heights, use a vertically-centered circle 2 points tall. | ||
| // * At greater track heights, create a vertically-centered rounded rectangle 2-points wide | ||
| // and half the track height. | ||
| CGFloat trackHeight = CGRectGetHeight(self.bounds); | ||
| CGFloat dotHeight = MIN(2, trackHeight); | ||
| CGFloat dotWidth = MIN(2, trackHeight); | ||
| CGFloat circleOriginY = (trackHeight - dotHeight) / 2; | ||
| if (trackHeight > 4) { | ||
| dotHeight = trackHeight / 2; | ||
| circleOriginY = (trackHeight - dotHeight) / 2; | ||
| } | ||
| CGRect dotRect = CGRectMake(0, (trackHeight - dotHeight) / 2, dotWidth, dotHeight); | ||
| // Increment within the bounds | ||
| CGFloat absoluteIncrement = (CGRectGetWidth(self.bounds) - dotWidth) / (_numDiscreteDots - 1); | ||
| // Increment within 0..1 | ||
| CGFloat relativeIncrement = (CGFloat)1.0 / (_numDiscreteDots - 1); | ||
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| // Allow an extra 10% of the increment to guard against rounding errors excluding dots that | ||
| // should genuinely be within the active segment. | ||
| CGFloat minActiveX = CGRectGetMinX(self.activeDotsSegment) - relativeIncrement * (CGFloat)0.1; | ||
| CGFloat maxActiveX = CGRectGetMaxX(self.activeDotsSegment) + relativeIncrement * (CGFloat)0.1; | ||
| for (NSUInteger i = 0; i < _numDiscreteDots; i++) { | ||
| CGFloat relativePosition = i * relativeIncrement; | ||
| if (minActiveX <= relativePosition && maxActiveX >= relativePosition) { | ||
| [self.activeDotColor setFill]; | ||
| } else { | ||
| [self.inactiveDotColor setFill]; | ||
| } | ||
| dotRect.origin.x = (i * absoluteIncrement); | ||
| // Clear any previous paths from the context | ||
| CGContextBeginPath(contextRef); | ||
| CGPathRef rectPathRef = | ||
| CGPathCreateWithRoundedRect(dotRect, dotWidth / 2, dotWidth / 2, NULL); | ||
| CGContextAddPath(contextRef, rectPathRef); | ||
| CGContextFillPath(contextRef); | ||
| CGPathRelease(rectPathRef); | ||
| } | ||
| } | ||
| } | ||
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| - (void)setNumDiscreteDots:(NSUInteger)numDiscreteDots { | ||
| _numDiscreteDots = numDiscreteDots; | ||
| [self setNeedsDisplay]; | ||
| } | ||
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| @end |
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