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| Original file line number | Diff line number | Diff line change |
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| /** | ||
| * Copyright (c) 2015-present, Alec Larson | ||
| * 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. | ||
| * | ||
| * @providesModule Gradient | ||
| * @noflow | ||
| */ | ||
| 'use strict'; | ||
|
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| const React = require('react'); | ||
| const requireNativeComponent = require('requireNativeComponent'); | ||
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| const RCTGradient = requireNativeComponent('RCTGradient'); | ||
|
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| const Gradient = React.forwardRef((props, ref) => ( | ||
| <RCTGradient ref={ref} {...props} /> | ||
| )); | ||
|
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| Gradient.displayName = 'Gradient'; | ||
|
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| module.exports = Gradient; |
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,47 @@ | ||
| // The MIT License (MIT) | ||
| // | ||
| // Copyright (c) 2014 Jernej Strasner | ||
| // | ||
| // 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. | ||
|
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| #import <React/RCTView.h> | ||
|
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| @interface RCTGradient : RCTView | ||
|
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| /// The starting color of the gradient. | ||
| @property (nonatomic, nonnull) NSColor *startColor; | ||
|
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| /// The ending color of the gradient. | ||
| @property (nonatomic, nonnull) NSColor *endColor; | ||
|
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| /// The interpolation factor of the gradient. This defines how smooth the color transition is. | ||
| @property (nonatomic) CGFloat slopeFactor; | ||
|
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| /// If YES the gradient is drawn before the start point. | ||
| @property (nonatomic) BOOL drawsBeforeStart; | ||
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| /// If YES the gradient is drawn past the end point. | ||
| @property (nonatomic) BOOL drawsAfterEnd; | ||
|
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| /// The location of the gradient drawing start relative to the view's coordinate space (0.0 - 1.0). | ||
| @property (nonatomic) CGPoint startPoint; | ||
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| /// The location of the gradient drawing end relative to the view's coordinate space (0.0 - 1.0). | ||
| @property (nonatomic) CGPoint endPoint; | ||
|
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| @end |
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| // The MIT License (MIT) | ||
| // | ||
| // Copyright (c) 2014 Jernej Strasner | ||
| // | ||
| // 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. | ||
|
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| #import "RCTGradient.h" | ||
|
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| #import "RCTLog.h" | ||
| #import "RCTUtils.h" | ||
| #import "UIImageUtils.h" | ||
|
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| // Info struct to pass to shading function | ||
| struct _JSTFunctionInfo { | ||
| CGFloat startColor[4]; | ||
| CGFloat endColor[4]; | ||
| CGFloat slopeFactor; | ||
| }; | ||
| typedef struct _JSTFunctionInfo JSTFunctionInfo; | ||
| typedef struct _JSTFunctionInfo* JSTFunctionInfoRef; | ||
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| static JSTFunctionInfoRef JSTFunctionInfoCreate() { | ||
| return (JSTFunctionInfoRef)malloc(sizeof(JSTFunctionInfo)); | ||
| } | ||
|
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| static void JSTFunctionInfoRelease(JSTFunctionInfoRef info) { | ||
| if (info != NULL) { | ||
| free(info); | ||
| } | ||
| } | ||
|
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| // Distributes values on a slope aka. ease-in ease-out | ||
| static float JSTSlope(float x, float A) | ||
| { | ||
| float p = powf(x, A); | ||
| return p/(p + powf(1.0f-x, A)); | ||
| } | ||
|
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| // This is the callback of our shading function. | ||
| // info: color and slope information | ||
| // inData: contains a single float that gives is the current position within the gradient | ||
| // outData: we fill this with the color to display at the given position | ||
| static void JSTShadingFunction(void *infoPtr, const CGFloat *inData, CGFloat *outData) | ||
| { | ||
| JSTFunctionInfo info = *(JSTFunctionInfo*)infoPtr; // Info struct with colors and parameters | ||
| float p = inData[0]; // Position in gradient | ||
| float q = JSTSlope(p, info.slopeFactor); // Slope value | ||
| outData[0] = info.startColor[0] + (info.endColor[0] - info.startColor[0])*q; | ||
| outData[1] = info.startColor[1] + (info.endColor[1] - info.startColor[1])*q; | ||
| outData[2] = info.startColor[2] + (info.endColor[2] - info.startColor[2])*q; | ||
| outData[3] = info.startColor[3] + (info.endColor[3] - info.startColor[3])*q; | ||
| } | ||
|
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| @implementation RCTGradient | ||
| { | ||
| CGColorSpaceRef _colorSpace; | ||
| CGFloat _startColorComps[4]; | ||
| CGFloat _endColorComps[4]; | ||
| CGFunctionRef _function; | ||
| JSTFunctionInfoRef _functionInfo; | ||
| BOOL _opaque; | ||
| } | ||
|
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| - (instancetype)init | ||
| { | ||
| return [self initWithFrame:CGRectZero]; | ||
| } | ||
|
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| - (instancetype)initWithFrame:(CGRect)frame | ||
| { | ||
| if (self = [super initWithFrame:frame]) { | ||
| _colorSpace = CGColorSpaceCreateDeviceRGB(); | ||
| _startColor = [NSColor clearColor]; | ||
| _endColor = [NSColor clearColor]; | ||
| _startPoint = CGPointMake(0, 0.5); | ||
| _endPoint = CGPointMake(1, 0.5); | ||
| _slopeFactor = 1; | ||
| } | ||
| return self; | ||
| } | ||
|
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| RCT_NOT_IMPLEMENTED(- (instancetype)initWithCoder:unused) | ||
|
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| - (void)dealloc | ||
| { | ||
| JSTFunctionInfoRelease(_functionInfo); | ||
| CGFunctionRelease(_function); | ||
| CGColorSpaceRelease(_colorSpace); | ||
| } | ||
|
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| - (void)setStartColor:(NSColor *)startColor | ||
| { | ||
| if (_startColor == startColor) return; | ||
| _startColor = startColor; | ||
|
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| [startColor getRed:_startColorComps green:_startColorComps+1 blue:_startColorComps+2 alpha:_startColorComps+3]; | ||
| } | ||
|
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| - (void)setEndColor:(NSColor *)endColor | ||
| { | ||
| if (_endColor == endColor) return; | ||
| _endColor = endColor; | ||
|
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| [endColor getRed:_endColorComps green:_endColorComps+1 blue:_endColorComps+2 alpha:_endColorComps+3]; | ||
| } | ||
|
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| - (void)didSetProps:(NSArray<NSString *> *)changedProps | ||
| { | ||
| for (NSString *prop in changedProps) { | ||
| if ([prop isEqualToString:@"startColor"] || | ||
| [prop isEqualToString:@"endColor"] || | ||
| [prop isEqualToString:@"slopeFactor"]) { | ||
| [self _createShadingFunction]; | ||
| break; | ||
| } | ||
| } | ||
| [self setNeedsDisplay:YES]; | ||
| } | ||
|
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| - (BOOL)isOpaque | ||
| { | ||
| return _endColorComps[3] == 1 && _startColorComps[3] == 1; | ||
| } | ||
|
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| - (void)_createShadingFunction | ||
| { | ||
| // Shading function info | ||
| JSTFunctionInfoRelease(_functionInfo); | ||
| _functionInfo = JSTFunctionInfoCreate(); | ||
| memcpy(_functionInfo->startColor, _startColorComps, sizeof(CGFloat)*4); | ||
| memcpy(_functionInfo->endColor, _endColorComps, sizeof(CGFloat)*4); | ||
| _functionInfo->slopeFactor = _slopeFactor; | ||
|
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| // Define the shading callbacks | ||
| CGFunctionCallbacks callbacks = {0, JSTShadingFunction, NULL}; | ||
|
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| // As input to our function we want 1 value in the range [0.0, 1.0]. | ||
| // This is our position within the gradient. | ||
| size_t domainDimension = 1; | ||
| CGFloat domain[2] = {0.0f, 1.0f}; | ||
|
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| // The output of our shading function are 4 values, each in the range [0.0, 1.0]. | ||
| // By specifying 4 ranges here, we limit each color component to that range. Values outside of the range get clipped. | ||
| size_t rangeDimension = 4; | ||
| CGFloat range[8] = { | ||
| 0.0f, 1.0f, // R | ||
| 0.0f, 1.0f, // G | ||
| 0.0f, 1.0f, // B | ||
| 0.0f, 1.0f // A | ||
| }; | ||
|
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| // Create the shading function | ||
| CGFunctionRelease(_function); | ||
| _function = CGFunctionCreate(_functionInfo, domainDimension, domain, rangeDimension, range, &callbacks); | ||
| } | ||
|
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| - (void)displayLayer:(CALayer *)layer | ||
| { | ||
| [super displayLayer:layer]; | ||
|
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| const CGSize size = self.bounds.size; | ||
| UIGraphicsBeginImageContextWithOptions(size, self.isOpaque, 0.0); | ||
|
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| // Preserve contents from super call. | ||
| NSImage *contents = layer.contents; | ||
| [contents drawInRect:self.bounds]; | ||
|
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| // Draw the gradient. | ||
| [self drawRect:self.bounds]; | ||
|
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| // Fetch the drawing bitmap. | ||
| contents = UIGraphicsGetImageFromCurrentImageContext(); | ||
| UIGraphicsEndImageContext(); | ||
|
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| layer.contents = contents; | ||
| layer.magnificationFilter = kCAFilterNearest; | ||
| layer.needsDisplayOnBoundsChange = YES; | ||
| } | ||
|
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| - (void)drawRect:(CGRect)rect | ||
| { | ||
| // Prepare general variables | ||
| CGContextRef context = UIGraphicsGetCurrentContext(); | ||
|
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| // Create the shading object | ||
| CGPoint startPoint = CGPointMake(_startPoint.x * rect.size.width, _startPoint.y * rect.size.height); | ||
| CGPoint endPoint = CGPointMake(_endPoint.x * rect.size.width, _endPoint.y * rect.size.height); | ||
| CGShadingRef shading = CGShadingCreateAxial(_colorSpace, startPoint, endPoint, _function, _drawsBeforeStart, _drawsAfterEnd); | ||
|
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| // Draw the shading | ||
| CGContextDrawShading(context, shading); | ||
|
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| // Clean up | ||
| CGShadingRelease(shading); | ||
| } | ||
|
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| @end |
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