/**
* 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<<9165e7546c964b47cb01be9ff8070aa8>>
package com.facebook.csslayout;
import com.facebook.infer.annotation.Assertions;
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 boolean POSITIVE_FLEX_IS_AUTO = false;
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 boolean isFlexBasisAuto(CSSNode node) {
if (POSITIVE_FLEX_IS_AUTO) {
// All flex values are auto.
return true;
} else {
// A flex value > 0 implies a basis of zero.
return node.style.flex <= 0;
}
}
private static float getFlexGrowFactor(CSSNode node) {
// Flex grow is implied by positive values for flex.
if (node.style.flex > 0) {
return node.style.flex;
}
return 0;
}
private static float getFlexShrinkFactor(CSSNode node) {
if (POSITIVE_FLEX_IS_AUTO) {
// A flex shrink factor of 1 is implied by non-zero values for flex.
if (node.style.flex != 0) {
return 1;
}
} else {
// A flex shrink factor of 1 is implied by negative values for flex.
if (node.style.flex < 0) {
return 1;
}
}
return 0;
}
private static float boundAxisWithinMinAndMax(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 float boundAxis(CSSNode node, int axis, float value) {
float paddingAndBorderAxis =
node.style.padding.getWithFallback(leadingSpacing[axis], leading[axis]) +
node.style.border.getWithFallback(leadingSpacing[axis], leading[axis]) +
node.style.padding.getWithFallback(trailingSpacing[axis], trailing[axis]) +
node.style.border.getWithFallback(trailingSpacing[axis], trailing[axis]);
return Math.max(boundAxisWithinMinAndMax(node, axis, value), paddingAndBorderAxis);
}
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 void setPosition(CSSNode node, CSSDirection direction) {
int mainAxis = resolveAxis(getFlexDirection(node), direction);
int crossAxis = getCrossFlexDirection(mainAxis, direction);
node.layout.position[leading[mainAxis]] = node.style.margin.getWithFallback(leadingSpacing[mainAxis], leading[mainAxis]) +
getRelativePosition(node, mainAxis);
node.layout.position[trailing[mainAxis]] = node.style.margin.getWithFallback(trailingSpacing[mainAxis], trailing[mainAxis]) +
getRelativePosition(node, mainAxis);
node.layout.position[leading[crossAxis]] = node.style.margin.getWithFallback(leadingSpacing[crossAxis], leading[crossAxis]) +
getRelativePosition(node, crossAxis);
node.layout.position[trailing[crossAxis]] = node.style.margin.getWithFallback(trailingSpacing[crossAxis], trailing[crossAxis]) +
getRelativePosition(node, crossAxis);
}
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();
}
/*package*/ static void layoutNode(
CSSLayoutContext layoutContext,
CSSNode node,
float availableWidth,
float availableHeight,
CSSDirection parentDirection) {
// Increment the generation count. This will force the recursive routine to visit
// all dirty nodes at least once. Subsequent visits will be skipped if the input
// parameters don't change.
layoutContext.currentGenerationCount++;
// If the caller didn't specify a height/width, use the dimensions
// specified in the style.
if (Float.isNaN(availableWidth) && node.style.dimensions[DIMENSION_WIDTH] >= 0.0) {
float marginAxisRow = (node.style.margin.getWithFallback(leadingSpacing[CSS_FLEX_DIRECTION_ROW], leading[CSS_FLEX_DIRECTION_ROW]) + node.style.margi
react-native-0.28.0-rc.0.zip （2000个子文件） 
Layout.c 74KB JSCExecutor.cpp 23KB JSCExecutor.cpp 21KB OnLoad.cpp 20KB JSCTracing.cpp 14KB NativeToJsBridge.cpp 12KB Exceptions.cpp 12KB JSCTracing.cpp 12KB ModuleRegistryHolder.cpp 12KB LocalString.cpp 9KB CatalystInstanceImpl.cpp 9KB Bridge.cpp 8KB fbjni.cpp 8KB CxxModuleWrapper.cpp 8KB JSCPerfLogging.cpp 8KB JSCPerfLogging.cpp 8KB jscexecutor.cpp 7KB MethodInvoker.cpp 7KB OnLoad.cpp 6KB jni_helpers.cpp 6KB ReadableNativeMap.cpp 5KB Value.cpp 4KB methodcall.cpp 4KB Value.cpp 4KB OnLoad.cpp 4KB Instance.cpp 4KB JSCWebWorker.cpp 4KB ProxyExecutor.cpp 4KB JSCHelpers.cpp 4KB ModuleRegistry.cpp 3KB ReadableNativeArray.cpp 3KB SampleCxxModule.cpp 3KB JSLoader.cpp 3KB ProxyExecutor.cpp 3KB glog_init.cpp 3KB WritableNativeMap.cpp 3KB JSLoader.cpp 3KB lyra.cpp 3KB WritableNativeArray.cpp 3KB JniJSModulesUnbundle.cpp 2KB JniJSModulesUnbundle.cpp 2KB ByteBuffer.cpp 2KB JSCLegacyProfiler.cpp 2KB JSCLegacyProfiler.cpp 2KB log.cpp 2KB Countable.cpp 2KB Hybrid.cpp 2KB Environment.cpp 2KB MethodCall.cpp 2KB MethodCall.cpp 2KB JSCLegacyTracing.cpp 2KB OnLoad.cpp 2KB JMessageQueueThread.cpp 2KB JSCHelpers.cpp 2KB JSCPerfStats.cpp 2KB JSCPerfStats.cpp 2KB NativeCommon.cpp 2KB JMessageQueueThread.cpp 1KB JSCMemory.cpp 1KB JSCMemory.cpp 1KB WeakReference.cpp 1KB assert.cpp 1KB JSLogging.cpp 1KB JSLogging.cpp 1KB jsclogging.cpp 1KB value.cpp 1KB References.cpp 928B NativeArray.cpp 791B JExecutorToken.cpp 742B onload.cpp 625B NativeMap.cpp 589B Platform.cpp 563B JExecutorToken.cpp 530B OnLoad.cpp 512B Platform.cpp 493B react-native.css 23KB style.css 1KB CoreClasses.h 21KB References.h 20KB CoreClasses-inl.h 19KB Meta-inl.h 17KB References-inl.h 14KB Meta.h 12KB RCTImageLoader.h 10KB log.h 9KB RCTConvert.h 9KB RCTBridgeModule.h 8KB Hybrid.h 8KB RCTShadowView.h 7KB RCTProfile.h 7KB RefPtr.h 7KB Registration-inl.h 7KB FBSnapshotTestController.h 6KB RCTBridge.h 6KB Iterator-inl.h 6KB RCTUtils.h 6KB Layout.h 5KB lyra.h 5KB JSCExecutor.h 5KB RCTRootView.h 5KB共 2000 条
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