yoga/tests/YGMeasureCacheTest.cpp

/**
 * 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.
 */
#include <gtest/gtest.h>
#include <yoga/YGNode.h>
#include <yoga/Yoga.h>

static YGSize _measureMax(YGNodeRef node,
                          float width,
                          YGMeasureMode widthMode,
                          float height,
                          YGMeasureMode heightMode) {
  int* measureCount = (int*)node->getContext();
  (*measureCount)++;

  return YGSize{
      .width = widthMode == YGMeasureModeUndefined ? 10 : width,
      .height = heightMode == YGMeasureModeUndefined ? 10 : height,
  };
}

static YGSize _measureMin(YGNodeRef node,
                          float width,
                          YGMeasureMode widthMode,
                          float height,
                          YGMeasureMode heightMode) {
  int* measureCount = (int*)node->getContext();
  *measureCount = *measureCount + 1;
  return YGSize{
      .width =
          widthMode == YGMeasureModeUndefined || (widthMode == YGMeasureModeAtMost && width > 10)
              ? 10
              : width,
      .height =
          heightMode == YGMeasureModeUndefined || (heightMode == YGMeasureModeAtMost && height > 10)
              ? 10
              : height,
  };
}

static YGSize _measure_84_49(YGNodeRef node,
                             float width,
                             YGMeasureMode widthMode,
                             float height,
                             YGMeasureMode heightMode) {
  int* measureCount = (int*)node->getContext();
  if (measureCount) {
    (*measureCount)++;
  }

  return YGSize{
      .width = 84.f, .height = 49.f,
  };
}

TEST(YogaTest, measure_once_single_flexible_child) {
  const YGNodeRef root = YGNodeNew();
  YGNodeStyleSetFlexDirection(root, YGFlexDirectionRow);
  YGNodeStyleSetAlignItems(root, YGAlignFlexStart);
  YGNodeStyleSetWidth(root, 100);
  YGNodeStyleSetHeight(root, 100);

  const YGNodeRef root_child0 = YGNodeNew();
  int measureCount = 0;
  root_child0->setContext(&measureCount);
  root_child0->setMeasureFunc(_measureMax);
  YGNodeStyleSetFlexGrow(root_child0, 1);
  YGNodeInsertChild(root, root_child0, 0);

  YGNodeCalculateLayout(root, YGUndefined, YGUndefined, YGDirectionLTR);

  ASSERT_EQ(1, measureCount);

  YGNodeFreeRecursive(root);
}

TEST(YogaTest, remeasure_with_same_exact_width_larger_than_needed_height) {
  const YGNodeRef root = YGNodeNew();

  const YGNodeRef root_child0 = YGNodeNew();
  int measureCount = 0;
  root_child0->setContext(&measureCount);
  root_child0->setMeasureFunc(_measureMin);
  YGNodeInsertChild(root, root_child0, 0);

  YGNodeCalculateLayout(root, 100, 100, YGDirectionLTR);
  YGNodeCalculateLayout(root, 100, 50, YGDirectionLTR);

  ASSERT_EQ(1, measureCount);

  YGNodeFreeRecursive(root);
}

TEST(YogaTest, remeasure_with_same_atmost_width_larger_than_needed_height) {
  const YGNodeRef root = YGNodeNew();
  YGNodeStyleSetAlignItems(root, YGAlignFlexStart);

  const YGNodeRef root_child0 = YGNodeNew();
  int measureCount = 0;
  root_child0->setContext(&measureCount);
  root_child0->setMeasureFunc(_measureMin);
  YGNodeInsertChild(root, root_child0, 0);

  YGNodeCalculateLayout(root, 100, 100, YGDirectionLTR);
  YGNodeCalculateLayout(root, 100, 50, YGDirectionLTR);

  ASSERT_EQ(1, measureCount);

  YGNodeFreeRecursive(root);
}

TEST(YogaTest, remeasure_with_computed_width_larger_than_needed_height) {
  const YGNodeRef root = YGNodeNew();
  YGNodeStyleSetAlignItems(root, YGAlignFlexStart);

  const YGNodeRef root_child0 = YGNodeNew();
  int measureCount = 0;
  root_child0->setContext(&measureCount);
  root_child0->setMeasureFunc(_measureMin);
  YGNodeInsertChild(root, root_child0, 0);

  YGNodeCalculateLayout(root, 100, 100, YGDirectionLTR);
  YGNodeStyleSetAlignItems(root, YGAlignStretch);
  YGNodeCalculateLayout(root, 10, 50, YGDirectionLTR);

  ASSERT_EQ(1, measureCount);

  YGNodeFreeRecursive(root);
}

TEST(YogaTest, remeasure_with_atmost_computed_width_undefined_height) {
  const YGNodeRef root = YGNodeNew();
  YGNodeStyleSetAlignItems(root, YGAlignFlexStart);

  const YGNodeRef root_child0 = YGNodeNew();
  int measureCount = 0;
  root_child0->setContext(&measureCount);
  root_child0->setMeasureFunc(_measureMin);
  YGNodeInsertChild(root, root_child0, 0);

  YGNodeCalculateLayout(root, 100, YGUndefined, YGDirectionLTR);
  YGNodeCalculateLayout(root, 10, YGUndefined, YGDirectionLTR);

  ASSERT_EQ(1, measureCount);

  YGNodeFreeRecursive(root);
}

TEST(YogaTest, remeasure_with_already_measured_value_smaller_but_still_float_equal) {
  int measureCount = 0;

  const YGNodeRef root = YGNodeNew();
  YGNodeStyleSetWidth(root, 288.f);
  YGNodeStyleSetHeight(root, 288.f);
  YGNodeStyleSetFlexDirection(root, YGFlexDirectionRow);

  const YGNodeRef root_child0 = YGNodeNew();
  YGNodeStyleSetPadding(root_child0, YGEdgeAll, 2.88f);
  YGNodeStyleSetFlexDirection(root_child0, YGFlexDirectionRow);
  YGNodeInsertChild(root, root_child0, 0);

  const YGNodeRef root_child0_child0 = YGNodeNew();
  root_child0_child0->setContext(&measureCount);
  root_child0_child0->setMeasureFunc(_measure_84_49);
  YGNodeInsertChild(root_child0, root_child0_child0, 0);

  YGNodeCalculateLayout(root, YGUndefined, YGUndefined, YGDirectionLTR);

  YGNodeFreeRecursive(root);

  ASSERT_EQ(1, measureCount);
}