/**
* 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.
*/
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(CSSNodeDEPRECATED, 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 boolean isFlexBasisAuto(CSSNodeDEPRECATED node) {
return CSSConstants.isUndefined(node.style.flexBasis);
}
private static float getFlexGrowFactor(CSSNodeDEPRECATED node) {
return node.style.flexGrow;
}
private static float getFlexShrinkFactor(CSSNodeDEPRECATED node) {
return node.style.flexShrink;
}
private static float boundAxisWithinMinAndMax(CSSNodeDEPRECATED 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(CSSNodeDEPRECATED 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(CSSNodeDEPRECATED node, int axis) {
float lead = node.style.position.getWithFallback(leadingSpacing[axis], leading[axis]);
if (!Float.isNaN(lead)) {
return lead;
}
float trailingPos = node.style.position.getWithFallback(trailingSpacing[axis], trailing[axis]);
return Float.isNaN(trailingPos) ? 0 : -trailingPos;
}
private static void setPosition(CSSNodeDEPRECATED 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(CSSNodeDEPRECATED node, CSSDirection parentDirection) {
CSSDirection direction = node.style.direction;
if (direction == CSSDirection.INHERIT) {
direction = (parentDirection == null ? CSSDirection.LTR : parentDirection);
}
return direction;
}
private static int getFlexDirection(CSSNodeDEPRECATED 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(CSSNodeDEPRECATED node, CSSNodeDEPRECATED child) {
if (child.style.alignSelf != CSSAlign.AUTO) {
return child.style.alignSelf;
}
return node.style.alignItems;
}
private static boolean isMeasureDefined(CSSNodeDEPRECATED node) {
return node.isMeasureDefined();
}
/*package*/ static void layoutNode(
CSSLayoutContext layoutContext,
CSSNodeDEPRECATED 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++;
CSSMeasureMode widthMeasureMode = CSSMeasureMode.UNDEFINED;
CSSMeasureMode heightMeasureMode = CSSMeasureMode.UNDEFINED;
if (!Float.isNaN(availableWidth)) {
widthMeasureMode = CSSMeasureMode.EXACTLY;
} else if (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.margin.getWithFallback(trailingSpacing[CSS_FLEX_DIRECTION_ROW], trailing[CSS_FLEX_DIRECTION_ROW]));
availableWidth = node.style.dimensions[DIMENSION_WIDTH] + marginAxisRow;
widthMeasureMode = CSSMeasureMode.EXACTLY;
} else if (node.style.maxWidth >= 0.0) {
availableWidth = node.style.maxWidth;
widthMeasureMode = CSSMeasureMode.AT_MOST;
}
if (!Float.isNaN(availableHeight)) {
heightMeasureMode = CSSMeasureMode.EXAC
react-native-0.38.0-rc.0.zip （2000个子文件） 
CSSLayout.c 99KB CSSNodeList.c 2KB JSCExecutor.cpp 25KB NativeToJsBridge.cpp 13KB JSCTracing.cpp 12KB CatalystInstanceImpl.cpp 10KB LocalString.cpp 9KB jscexecutor.cpp 9KB CxxModuleWrapper.cpp 9KB fbjni.cpp 8KB Value.cpp 8KB Exceptions.cpp 8KB JSCPerfLogging.cpp 8KB ModuleRegistryHolder.cpp 8KB CxxMessageQueue.cpp 7KB JSCHelpers.cpp 7KB OnLoad.cpp 7KB MicroProfiler.cpp 7KB MethodInvoker.cpp 7KB CxxNativeModule.cpp 6KB OnLoad.cpp 6KB jni_helpers.cpp 6KB Instance.cpp 6KB InspectorController.cpp 5KB methodcall.cpp 5KB ReadableNativeMap.cpp 5KB ConsoleAgent.cpp 5KB Inspector.cpp 5KB JSDispatcher.cpp 4KB JSCWebWorker.cpp 4KB jsarg_helpers.cpp 4KB ProxyExecutor.cpp 4KB ModuleRegistry.cpp 4KB SampleCxxModule.cpp 4KB Environment.cpp 3KB ReadableNativeArray.cpp 3KB JSLoader.cpp 3KB CxxMessageQueueTest.cpp 3KB lyra.cpp 3KB glog_init.cpp 3KB value.cpp 3KB WritableNativeMap.cpp 3KB JMessageQueueThread.cpp 3KB JInspector.cpp 3KB Unicode.cpp 3KB WritableNativeArray.cpp 3KB JniJSModulesUnbundle.cpp 2KB LegacyRuntimeAgent.cpp 2KB JSCLegacyProfiler.cpp 2KB ByteBuffer.cpp 2KB log.cpp 2KB Countable.cpp 2KB MethodCall.cpp 2KB Executor.cpp 2KB Protocol.cpp 2KB Hybrid.cpp 2KB JSCLegacyTracing.cpp 2KB JSCNativeModules.cpp 2KB JSCPerfStats.cpp 2KB NativeCommon.cpp 2KB LegacyDispatcher.cpp 2KB LegacyScriptDebugServer.cpp 2KB LegacyDebuggerAgent.cpp 1KB Agent.cpp 1KB JSCMemory.cpp 1KB WeakReference.cpp 1KB assert.cpp 1KB JSLogging.cpp 1KB LegacyAgents.cpp 1KB jsclogging.cpp 1KB References.cpp 928B LegacyInspectorEnvironment.cpp 902B PageAgent.cpp 810B JSCSamplingProfiler.cpp 809B NativeArray.cpp 791B onload.cpp 751B JExecutorToken.cpp 742B OnLoad.cpp 603B NativeMap.cpp 589B Error.cpp 519B Platform.cpp 493B InspectorAgent.cpp 449B JSCUtils.cpp 334B Dummy.cpp 143B Util.cpp 121B Dispatcher.cpp 82B react-native.css 30KB 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 9KB log.h 9KB RCTConvert.h 9KB RCTShadowView.h 9KB CSSLayout.h 8KB RCTBridgeModule.h 8KB共 2000 条
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