mirror of
https://github.com/Swiftgram/Telegram-iOS.git
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61dade6bda
https://github.com/TextureGroup/Texture/pull/743 Manually merged since I forgot to retarget that diff onto master before merge
107 lines
3.7 KiB
Objective-C
107 lines
3.7 KiB
Objective-C
//
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// RandomCoreGraphicsNode.m
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// Sample
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//
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// Created by Scott Goodson on 9/5/15.
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//
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// Copyright (c) 2014-present, Facebook, Inc. All rights reserved.
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// This source code is licensed under the BSD-style license found in the
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// LICENSE file in the root directory of this source tree. An additional grant
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// of patent rights can be found in the PATENTS file in the same directory.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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// FACEBOOK BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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// ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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// CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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//
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#import "RandomCoreGraphicsNode.h"
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#import <AsyncDisplayKit/ASDisplayNode+Subclasses.h>
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@implementation RandomCoreGraphicsNode
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+ (UIColor *)randomColor
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{
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CGFloat hue = ( arc4random() % 256 / 256.0 ); // 0.0 to 1.0
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CGFloat saturation = ( arc4random() % 128 / 256.0 ) + 0.5; // 0.5 to 1.0, away from white
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CGFloat brightness = ( arc4random() % 128 / 256.0 ) + 0.5; // 0.5 to 1.0, away from black
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return [UIColor colorWithHue:hue saturation:saturation brightness:brightness alpha:1];
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}
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+ (void)drawRect:(CGRect)bounds withParameters:(id<NSObject>)parameters isCancelled:(asdisplaynode_iscancelled_block_t)isCancelledBlock isRasterizing:(BOOL)isRasterizing
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{
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CGFloat locations[3];
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NSMutableArray *colors = [NSMutableArray arrayWithCapacity:3];
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[colors addObject:(id)[[RandomCoreGraphicsNode randomColor] CGColor]];
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locations[0] = 0.0;
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[colors addObject:(id)[[RandomCoreGraphicsNode randomColor] CGColor]];
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locations[1] = 1.0;
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[colors addObject:(id)[[RandomCoreGraphicsNode randomColor] CGColor]];
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locations[2] = ( arc4random() % 256 / 256.0 );
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CGContextRef ctx = UIGraphicsGetCurrentContext();
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CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
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CGGradientRef gradient = CGGradientCreateWithColors(colorSpace, (CFArrayRef)colors, locations);
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CGGradientDrawingOptions drawingOptions;
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CGContextDrawLinearGradient(ctx, gradient, CGPointZero, CGPointMake(bounds.size.width, bounds.size.height), drawingOptions);
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CGColorSpaceRelease(colorSpace);
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}
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- (NSObject *)drawParametersForAsyncLayer:(_ASDisplayLayer *)layer
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{
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return [self description];
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}
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- (NSDictionary *)textStyle
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{
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UIFont *font = [UIFont fontWithName:@"HelveticaNeue" size:36.0f];
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NSMutableParagraphStyle *style = [[NSParagraphStyle defaultParagraphStyle] mutableCopy];
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style.paragraphSpacing = 0.5 * font.lineHeight;
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style.hyphenationFactor = 1.0;
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return @{ NSFontAttributeName: font,
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NSParagraphStyleAttributeName: style };
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}
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- (instancetype)init
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{
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if (!(self = [super init])) {
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return nil;
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}
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_textNode = [[ASTextNode alloc] init];
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_textNode.placeholderEnabled = NO;
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_textNode.attributedText = [[NSAttributedString alloc] initWithString:@"Hello, ASDK!"
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attributes:[self textStyle]];
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[self addSubnode:_textNode];
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return self;
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}
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- (CGSize)calculateSizeThatFits:(CGSize)constrainedSize
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{
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[_textNode layoutThatFits:ASSizeRangeMake(CGSizeZero, constrainedSize)];
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return CGSizeMake(constrainedSize.width, 100);
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}
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- (void)layout
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{
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[super layout];
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CGSize boundsSize = self.bounds.size;
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CGSize textSize = _textNode.calculatedSize;
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CGRect textRect = CGRectMake(roundf((boundsSize.width - textSize.width) / 2.0),
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roundf((boundsSize.height - textSize.height) / 2.0),
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textSize.width,
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textSize.height);
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_textNode.frame = textRect;
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}
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@end
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