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ARTNode.m
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ARTNode.m
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/*
* Copyright (c) Facebook, Inc. and its affiliates.
*
* This source code is licensed under the MIT license found in the
* LICENSE file in the root directory of this source tree.
*/
#import <React/ARTNode.h>
#import <React/ARTContainer.h>
@implementation ARTNode
- (void)insertReactSubview:(RCTUIView *)subview atIndex:(NSInteger)atIndex // TODO(macOS ISS#3536887)
{
[super insertReactSubview:subview atIndex:atIndex];
[self insertSubview:subview atIndex:atIndex];
[self invalidate];
}
- (void)removeReactSubview:(RCTUIView *)subview // TODO(macOS ISS#3536887)
{
[super removeReactSubview:subview];
[self invalidate];
}
- (void)didUpdateReactSubviews
{
// Do nothing, as subviews are inserted by insertReactSubview:
}
- (void)setOpacity:(CGFloat)opacity
{
[self invalidate];
_opacity = opacity;
}
- (void)setTransform:(CGAffineTransform)transform
{
[self invalidate];
super.transform = transform;
}
- (void)invalidate
{
if ([self.superview respondsToSelector:@selector(invalidate)]) {
id<ARTContainer> container = (id<ARTContainer>)self.superview;
[container invalidate];
}
}
- (void)renderTo:(CGContextRef)context
{
if (self.opacity <= 0) {
// Nothing to paint
return;
}
if (self.opacity >= 1) {
// Just paint at full opacity
CGContextSaveGState(context);
CGContextConcatCTM(context, self.transform);
CGContextSetAlpha(context, 1);
[self renderLayerTo:context];
CGContextRestoreGState(context);
return;
}
// This needs to be painted on a layer before being composited.
CGContextSaveGState(context);
CGContextConcatCTM(context, self.transform);
CGContextSetAlpha(context, self.opacity);
CGContextBeginTransparencyLayer(context, NULL);
[self renderLayerTo:context];
CGContextEndTransparencyLayer(context);
CGContextRestoreGState(context);
}
- (void)renderLayerTo:(CGContextRef)context
{
// abstract
}
@end