react-native/React/Base/Surface/SurfaceHostingView/RCTSurfaceSizeMeasureMode.h

/**
 * 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 <UIKit/UIKit.h>

#import <React/RCTDefines.h>

/**
 * Bitmask defines how size constrains from `-[UIView sizeThatFits:]`
 * are translated to `-[RCTSurface sizeThatFitsMinimumSize:maximumSize:]`.
 */
typedef NS_OPTIONS(NSInteger, RCTSurfaceSizeMeasureMode) {
  RCTSurfaceSizeMeasureModeWidthUndefined    = 0 << 0,
  RCTSurfaceSizeMeasureModeWidthExact        = 1 << 0,
  RCTSurfaceSizeMeasureModeWidthAtMost       = 2 << 0,
  RCTSurfaceSizeMeasureModeHeightUndefined   = 0 << 2,
  RCTSurfaceSizeMeasureModeHeightExact       = 1 << 2,
  RCTSurfaceSizeMeasureModeHeightAtMost      = 2 << 2,
};

/**
 * Returns size constraints based on `size` and `sizeMeasureMode`.
 */
RCT_EXTERN void RCTSurfaceMinimumSizeAndMaximumSizeFromSizeAndSizeMeasureMode(
  CGSize size,
  RCTSurfaceSizeMeasureMode sizeMeasureMode,
  CGSize *minimumSize,
  CGSize *maximumSize
);