react-native-0.26.0-rc.zip

/** * 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