/**
* Copyright (c) 2014-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.
*/
// NOTE: this file is auto-copied from https://github.com/facebook/css-layout
// @generated SignedSource<<9224a1489ee541a447ede3657538f5bc>>
package com.facebook.csslayout;
import static com.facebook.csslayout.CSSLayout.DIMENSION_HEIGHT;
import static com.facebook.csslayout.CSSLayout.DIMENSION_WIDTH;
import static com.facebook.csslayout.CSSLayout.POSITION_BOTTOM;
import static com.facebook.csslayout.CSSLayout.POSITION_LEFT;
import static com.facebook.csslayout.CSSLayout.POSITION_RIGHT;
import static com.facebook.csslayout.CSSLayout.POSITION_TOP;
/**
* Calculates layouts based on CSS style. See {@link #layoutNode(CSSNode, float, float)}.
*/
public class LayoutEngine {
private static final int CSS_FLEX_DIRECTION_COLUMN =
CSSFlexDirection.COLUMN.ordinal();
private static final int CSS_FLEX_DIRECTION_COLUMN_REVERSE =
CSSFlexDirection.COLUMN_REVERSE.ordinal();
private static final int CSS_FLEX_DIRECTION_ROW =
CSSFlexDirection.ROW.ordinal();
private static final int CSS_FLEX_DIRECTION_ROW_REVERSE =
CSSFlexDirection.ROW_REVERSE.ordinal();
private static final int CSS_POSITION_RELATIVE = CSSPositionType.RELATIVE.ordinal();
private static final int CSS_POSITION_ABSOLUTE = CSSPositionType.ABSOLUTE.ordinal();
private static final int[] leading = {
POSITION_TOP,
POSITION_BOTTOM,
POSITION_LEFT,
POSITION_RIGHT,
};
private static final int[] trailing = {
POSITION_BOTTOM,
POSITION_TOP,
POSITION_RIGHT,
POSITION_LEFT,
};
private static final int[] pos = {
POSITION_TOP,
POSITION_BOTTOM,
POSITION_LEFT,
POSITION_RIGHT,
};
private static final int[] dim = {
DIMENSION_HEIGHT,
DIMENSION_HEIGHT,
DIMENSION_WIDTH,
DIMENSION_WIDTH,
};
private static final int[] leadingSpacing = {
Spacing.TOP,
Spacing.BOTTOM,
Spacing.START,
Spacing.START
};
private static final int[] trailingSpacing = {
Spacing.BOTTOM,
Spacing.TOP,
Spacing.END,
Spacing.END
};
private static float boundAxis(CSSNode node, int axis, float value) {
float min = CSSConstants.UNDEFINED;
float max = CSSConstants.UNDEFINED;
if (axis == CSS_FLEX_DIRECTION_COLUMN ||
axis == CSS_FLEX_DIRECTION_COLUMN_REVERSE) {
min = node.style.minHeight;
max = node.style.maxHeight;
} else if (axis == CSS_FLEX_DIRECTION_ROW ||
axis == CSS_FLEX_DIRECTION_ROW_REVERSE) {
min = node.style.minWidth;
max = node.style.maxWidth;
}
float boundValue = value;
if (!Float.isNaN(max) && max >= 0.0 && boundValue > max) {
boundValue = max;
}
if (!Float.isNaN(min) && min >= 0.0 && boundValue < min) {
boundValue = min;
}
return boundValue;
}
private static void setDimensionFromStyle(CSSNode node, int axis) {
// The parent already computed us a width or height. We just skip it
if (!Float.isNaN(node.layout.dimensions[dim[axis]])) {
return;
}
// We only run if there's a width or height defined
if (Float.isNaN(node.style.dimensions[dim[axis]]) ||
node.style.dimensions[dim[axis]] <= 0.0) {
return;
}
// The dimensions can never be smaller than the padding and border
float maxLayoutDimension = Math.max(
boundAxis(node, axis, node.style.dimensions[dim[axis]]),
node.style.padding.getWithFallback(leadingSpacing[axis], leading[axis]) +
node.style.padding.getWithFallback(trailingSpacing[axis], trailing[axis]) +
node.style.border.getWithFallback(leadingSpacing[axis], leading[axis]) +
node.style.border.getWithFallback(trailingSpacing[axis], trailing[axis]));
node.layout.dimensions[dim[axis]] = maxLayoutDimension;
}
private static float getRelativePosition(CSSNode node, int axis) {
float lead = node.style.position[leading[axis]];
if (!Float.isNaN(lead)) {
return lead;
}
float trailingPos = node.style.position[trailing[axis]];
return Float.isNaN(trailingPos) ? 0 : -trailingPos;
}
private static int resolveAxis(
int axis,
CSSDirection direction) {
if (direction == CSSDirection.RTL) {
if (axis == CSS_FLEX_DIRECTION_ROW) {
return CSS_FLEX_DIRECTION_ROW_REVERSE;
} else if (axis == CSS_FLEX_DIRECTION_ROW_REVERSE) {
return CSS_FLEX_DIRECTION_ROW;
}
}
return axis;
}
private static CSSDirection resolveDirection(CSSNode node, CSSDirection parentDirection) {
CSSDirection direction = node.style.direction;
if (direction == CSSDirection.INHERIT) {
direction = (parentDirection == null ? CSSDirection.LTR : parentDirection);
}
return direction;
}
private static int getFlexDirection(CSSNode node) {
return node.style.flexDirection.ordinal();
}
private static int getCrossFlexDirection(
int axis,
CSSDirection direction) {
if (axis == CSS_FLEX_DIRECTION_COLUMN ||
axis == CSS_FLEX_DIRECTION_COLUMN_REVERSE) {
return resolveAxis(CSS_FLEX_DIRECTION_ROW, direction);
} else {
return CSS_FLEX_DIRECTION_COLUMN;
}
}
private static CSSAlign getAlignItem(CSSNode node, CSSNode child) {
if (child.style.alignSelf != CSSAlign.AUTO) {
return child.style.alignSelf;
}
return node.style.alignItems;
}
private static boolean isMeasureDefined(CSSNode node) {
return node.isMeasureDefined();
}
static boolean needsRelayout(CSSNode node, float parentMaxWidth, float parentMaxHeight) {
return node.isDirty() ||
!FloatUtil.floatsEqual(
node.lastLayout.requestedHeight,
node.layout.dimensions[DIMENSION_HEIGHT]) ||
!FloatUtil.floatsEqual(
node.lastLayout.requestedWidth,
node.layout.dimensions[DIMENSION_WIDTH]) ||
!FloatUtil.floatsEqual(node.lastLayout.parentMaxWidth, parentMaxWidth) ||
!FloatUtil.floatsEqual(node.lastLayout.parentMaxHeight, parentMaxHeight);
}
/*package*/ static void layoutNode(
CSSLayoutContext layoutContext,
CSSNode node,
float parentMaxWidth,
float parentMaxHeight,
CSSDirection parentDirection) {
if (needsRelayout(node, parentMaxWidth, parentMaxHeight)) {
node.lastLayout.requestedWidth = node.layout.dimensions[DIMENSION_WIDTH];
node.lastLayout.requestedHeight = node.layout.dimensions[DIMENSION_HEIGHT];
node.lastLayout.parentMaxWidth = parentMaxWidth;
node.lastLayout.parentMaxHeight = parentMaxHeight;
for (int i = 0, childCount = node.getChildCount(); i < childCount; i++) {
node.getChildAt(i).layout.resetResult();
}
layoutNodeImpl(layoutContext, node, parentMaxWidth, parentMaxHeight, parentDirection);
node.lastLayout.copy(node.layout);
} else {
node.layout.copy(node.lastLayout);
}
node.markHasNewLayout();
}
private static void layoutNodeImpl(
CSSLayoutContext layoutContext,
CSSNode node,
float parentMaxWidth,
float parentMaxHeight,
CSSDirection parentDirection) {
/** START_GENERATED **/
CSSDirection direction = resolveDirection(node, parentDirection);
int mainAxis = resolveAxis(getFlexDirection(node), direction);
int crossAxis = getCrossFlexDirection(mainAxis, direction);
int resolvedRowAxis = resolveAxis(CSS_FLEX_DIRECTION_ROW, direction);
// Handle width and height style attributes
setDimensionFromStyle(node, mainAxis);
setDimensionFromStyle(node, crossAxis);
// Set the resolved resolution in the node's layout
node.layout.direction = direction;
// The position is set by t
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