136 lines
3.9 KiB
Objective-C
136 lines
3.9 KiB
Objective-C
/**
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* Copyright (c) 2015-present, Facebook, Inc.
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* All rights reserved.
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*
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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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#import "RCTShadowView+Layout.h"
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#import <yoga/Yoga.h>
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/**
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* Yoga and CoreGraphics have different opinions about how "infinity" value
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* should be represented.
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* Yoga uses `NAN` which requires additional effort to compare all those values,
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* whereas GoreGraphics uses `GFLOAT_MAX` which can be easyly compared with
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* standard `==` operator.
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*/
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float RCTYogaFloatFromCoreGraphicsFloat(CGFloat value)
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{
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if (value == CGFLOAT_MAX || isnan(value) || isinf(value)) {
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return YGUndefined;
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}
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return value;
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}
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CGFloat RCTCoreGraphicsFloatFromYogaFloat(float value)
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{
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if (value == YGUndefined || isnan(value) || isinf(value)) {
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return CGFLOAT_MAX;
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}
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return value;
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}
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@implementation RCTShadowView (Layout)
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#pragma mark - Computed Layout-Inferred Metrics
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- (UIEdgeInsets)paddingAsInsets
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{
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YGNodeRef yogaNode = self.yogaNode;
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return (UIEdgeInsets){
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RCTCoreGraphicsFloatFromYogaFloat(YGNodeLayoutGetPadding(yogaNode, YGEdgeTop)),
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RCTCoreGraphicsFloatFromYogaFloat(YGNodeLayoutGetPadding(yogaNode, YGEdgeLeft)),
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RCTCoreGraphicsFloatFromYogaFloat(YGNodeLayoutGetPadding(yogaNode, YGEdgeBottom)),
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RCTCoreGraphicsFloatFromYogaFloat(YGNodeLayoutGetPadding(yogaNode, YGEdgeRight))
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};
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}
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- (UIEdgeInsets)borderAsInsets
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{
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YGNodeRef yogaNode = self.yogaNode;
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return (UIEdgeInsets){
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RCTCoreGraphicsFloatFromYogaFloat(YGNodeLayoutGetBorder(yogaNode, YGEdgeTop)),
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RCTCoreGraphicsFloatFromYogaFloat(YGNodeLayoutGetBorder(yogaNode, YGEdgeLeft)),
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RCTCoreGraphicsFloatFromYogaFloat(YGNodeLayoutGetBorder(yogaNode, YGEdgeBottom)),
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RCTCoreGraphicsFloatFromYogaFloat(YGNodeLayoutGetBorder(yogaNode, YGEdgeRight))
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};
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}
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- (UIEdgeInsets)compoundInsets
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{
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UIEdgeInsets borderAsInsets = self.borderAsInsets;
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UIEdgeInsets paddingAsInsets = self.paddingAsInsets;
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return (UIEdgeInsets){
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borderAsInsets.top + paddingAsInsets.top,
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borderAsInsets.left + paddingAsInsets.left,
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borderAsInsets.bottom + paddingAsInsets.bottom,
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borderAsInsets.right + paddingAsInsets.right
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};
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}
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- (CGSize)availableSize
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{
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return UIEdgeInsetsInsetRect((CGRect){CGPointZero, self.frame.size}, self.compoundInsets).size;
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}
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- (CGRect)contentFrame
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{
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CGRect bounds = (CGRect){CGPointZero, self.frame.size};
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return UIEdgeInsetsInsetRect(bounds, self.compoundInsets);
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}
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#pragma mark - Measuring
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- (CGSize)sizeThatFitsMinimumSize:(CGSize)minimumSize maximumSize:(CGSize)maximumSize
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{
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YGNodeRef clonnedYogaNode = YGNodeClone(self.yogaNode);
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YGNodeRef constraintYogaNode = YGNodeNewWithConfig([[self class] yogaConfig]);
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YGNodeInsertChild(constraintYogaNode, clonnedYogaNode, 0);
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YGNodeStyleSetMinWidth(constraintYogaNode, RCTYogaFloatFromCoreGraphicsFloat(minimumSize.width));
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YGNodeStyleSetMinHeight(constraintYogaNode, RCTYogaFloatFromCoreGraphicsFloat(minimumSize.height));
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YGNodeStyleSetMaxWidth(constraintYogaNode, RCTYogaFloatFromCoreGraphicsFloat(maximumSize.width));
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YGNodeStyleSetMaxHeight(constraintYogaNode, RCTYogaFloatFromCoreGraphicsFloat(maximumSize.height));
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YGNodeCalculateLayout(
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constraintYogaNode,
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YGUndefined,
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YGUndefined,
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self.layoutDirection
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);
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CGSize measuredSize = (CGSize){
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RCTCoreGraphicsFloatFromYogaFloat(YGNodeLayoutGetWidth(constraintYogaNode)),
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RCTCoreGraphicsFloatFromYogaFloat(YGNodeLayoutGetHeight(constraintYogaNode)),
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};
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YGNodeRemoveChild(constraintYogaNode, clonnedYogaNode);
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YGNodeFree(constraintYogaNode);
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YGNodeFree(clonnedYogaNode);
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return measuredSize;
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}
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#pragma mark - Dirty Propagation Control
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- (void)dirtyLayout
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{
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// The default implementaion does nothing.
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}
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- (void)clearLayout
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{
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// The default implementaion does nothing.
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}
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@end
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