react-native/React/Views/RCTSlider.m

/**
 * Copyright (c) 2015-present, Facebook, Inc.
 * All rights reserved.
 *
 * This source code is licensed under the BSD-style license found in the
 * LICENSE file in the root directory of this source tree. An additional grant
 * of patent rights can be found in the PATENTS file in the same directory.
 */

#import "RCTSlider.h"

#import <tgmath.h>

@implementation RCTSlider
{
  float _unclippedValue;
}

- (void)setValue:(float)value
{
  _unclippedValue = value;
  super.value = value;
}

- (void)setMinimumValue:(float)minimumValue
{
  super.minimumValue = minimumValue;
  super.value = _unclippedValue;
}

- (void)setMaximumValue:(float)maximumValue
{
  super.maximumValue = maximumValue;
  super.value = _unclippedValue;
}

- (void)setTrackImage:(UIImage *)trackImage
{
  if (trackImage != _trackImage) {
    _trackImage = trackImage;
    CGFloat width = trackImage.size.width / 2;
    UIImage *minimumTrackImage = [trackImage resizableImageWithCapInsets:(UIEdgeInsets){
      0, width, 0, width
    } resizingMode:UIImageResizingModeStretch];
    UIImage *maximumTrackImage = [trackImage resizableImageWithCapInsets:(UIEdgeInsets){
      0, width, 0, width
    } resizingMode:UIImageResizingModeStretch];
    [self setMinimumTrackImage:minimumTrackImage forState:UIControlStateNormal];
    [self setMaximumTrackImage:maximumTrackImage forState:UIControlStateNormal];
  }
}

- (void)setMinimumTrackImage:(UIImage *)minimumTrackImage
{
  _trackImage = nil;
  minimumTrackImage = [minimumTrackImage resizableImageWithCapInsets:(UIEdgeInsets){
    0, minimumTrackImage.size.width, 0, 0
  } resizingMode:UIImageResizingModeStretch];
  [self setMinimumTrackImage:minimumTrackImage forState:UIControlStateNormal];
}

- (UIImage *)minimumTrackImage
{
  return [self thumbImageForState:UIControlStateNormal];
}

- (void)setMaximumTrackImage:(UIImage *)maximumTrackImage
{
  _trackImage = nil;
  maximumTrackImage = [maximumTrackImage resizableImageWithCapInsets:(UIEdgeInsets){
    0, 0, 0, maximumTrackImage.size.width
  } resizingMode:UIImageResizingModeStretch];
  [self setMaximumTrackImage:maximumTrackImage forState:UIControlStateNormal];
}

- (UIImage *)maximumTrackImage
{
  return [self thumbImageForState:UIControlStateNormal];
}

- (void)setThumbImage:(UIImage *)thumbImage
{
  [self setThumbImage:thumbImage forState:UIControlStateNormal];
}

- (UIImage *)thumbImage
{
  return [self thumbImageForState:UIControlStateNormal];
}

@end