react-native/Libraries/ART/ARTNode.m

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/**
* 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 "ARTNode.h"
#import "ARTContainer.h"
@implementation ARTNode
- (void)insertReactSubview:(UIView *)subview atIndex:(NSInteger)atIndex
{
[super insertReactSubview:subview atIndex:atIndex];
[self insertSubview:subview atIndex:atIndex];
[self invalidate];
}
- (void)removeReactSubview:(UIView *)subview
{
[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
{
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