/**
* 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(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 boolean isFlexBasisAuto(CSSNode node) {
return CSSConstants.isUndefined(node.style.flexBasis);
}
private static float getFlexGrowFactor(CSSNode node) {
return node.style.flexGrow;
}
private static float getFlexShrinkFactor(CSSNode node) {
return node.style.flexShrink;
}
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.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(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++;
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.EXACTLY;
} else if (node.style.dimensions[DIMENSION_HEIGHT] >= 0.0) {
float marginAxisColumn = (node.style.margin.getWithFallback(lead
react-native-0.34.0-rc.1.zip （2000个子文件） 
CSSLayout.c 91KB CSSNodeList.c 2KB JSCExecutor.cpp 23KB 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 MicroProfiler.cpp 7KB OnLoad.cpp 7KB MethodInvoker.cpp 7KB OnLoad.cpp 6KB jni_helpers.cpp 6KB CxxNativeModule.cpp 5KB ReadableNativeMap.cpp 5KB Instance.cpp 5KB JSCHelpers.cpp 5KB methodcall.cpp 5KB JSCWebWorker.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 WritableNativeMap.cpp 3KB JMessageQueueThread.cpp 3KB Unicode.cpp 3KB WritableNativeArray.cpp 3KB JniJSModulesUnbundle.cpp 2KB MethodCall.cpp 2KB ByteBuffer.cpp 2KB JSCLegacyProfiler.cpp 2KB log.cpp 2KB Countable.cpp 2KB Executor.cpp 2KB Hybrid.cpp 2KB JSCLegacyTracing.cpp 2KB JSCPerfStats.cpp 2KB NativeCommon.cpp 2KB JSCMemory.cpp 1KB WeakReference.cpp 1KB assert.cpp 1KB value.cpp 1KB JSLogging.cpp 1KB jsclogging.cpp 1KB References.cpp 928B NativeArray.cpp 791B JSCSamplingProfiler.cpp 788B onload.cpp 751B JExecutorToken.cpp 742B OnLoad.cpp 603B NativeMap.cpp 589B Platform.cpp 493B Dummy.cpp 143B react-native.css 27KB style.css 1KB CoreClasses.h 21KB References.h 20KB CoreClasses-inl.h 19KB Meta-inl.h 17KB References-inl.h 14KB Meta.h 12KB log.h 9KB RCTImageLoader.h 9KB RCTShadowView.h 9KB RCTConvert.h 8KB RCTBridgeModule.h 8KB Hybrid.h 8KB Value.h 7KB RCTProfile.h 7KB RefPtr.h 7KB Registration-inl.h 7KB RCTBridge.h 7KB Executor.h 7KB CSSLayout.h 6KB FBSnapshotTestController.h 6KB RCTUtils.h 6KB Iterator-inl.h 6KB JSCExecutor.h 5KB lyra.h 5KB NativeToJsBridge.h 5KB RCTRootView.h 5KB RCTAssert.h 5KB RCTTestRunner.h 5KB CxxModule.h 5KB config.h 5KB RCTViewManager.h 5KB TypeTraits.h 5KB FBSnapshotTestCase.h 5KB共 2000 条
- 1
- 2
- 3
- 4
- 5
- 6
- 20
资源评论
