106 lines
2.5 KiB
C
106 lines
2.5 KiB
C
/**
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* Copyright (c) 2014-present, Facebook, Inc.
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* All rights reserved.
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*
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* This source code is licensed under the BSD-style license found in the
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* LICENSE file in the root directory of this source tree. An additional grant
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* of patent rights can be found in the PATENTS file in the same directory.
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*/
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#ifndef __CSS_LAYOUT_INTERNAL_H
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#define __CSS_LAYOUT_INTERNAL_H
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#include <stdio.h>
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#include <stdlib.h>
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#include "CSSLayout.h"
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#include "CSSNodeList.h"
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CSS_EXTERN_C_BEGIN
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typedef struct CSSCachedMeasurement {
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float availableWidth;
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float availableHeight;
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CSSMeasureMode widthMeasureMode;
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CSSMeasureMode heightMeasureMode;
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float computedWidth;
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float computedHeight;
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} CSSCachedMeasurement;
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// This value was chosen based on empiracle data. Even the most complicated
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// layouts should not require more than 16 entries to fit within the cache.
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enum {
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CSS_MAX_CACHED_RESULT_COUNT = 16
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};
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typedef struct CSSLayout {
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float position[4];
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float dimensions[2];
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CSSDirection direction;
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float flexBasis;
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// Instead of recomputing the entire layout every single time, we
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// cache some information to break early when nothing changed
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int generationCount;
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CSSDirection lastParentDirection;
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int nextCachedMeasurementsIndex;
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CSSCachedMeasurement cachedMeasurements[CSS_MAX_CACHED_RESULT_COUNT];
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float measuredDimensions[2];
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CSSCachedMeasurement cached_layout;
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} CSSLayout;
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typedef struct CSSStyle {
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CSSDirection direction;
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CSSFlexDirection flexDirection;
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CSSJustify justifyContent;
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CSSAlign alignContent;
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CSSAlign alignItems;
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CSSAlign alignSelf;
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CSSPositionType positionType;
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CSSWrapType flexWrap;
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CSSOverflow overflow;
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float flex;
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float margin[6];
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float position[4];
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/**
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* You should skip all the rules that contain negative values for the
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* following attributes. For example:
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* {padding: 10, paddingLeft: -5}
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* should output:
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* {left: 10 ...}
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* the following two are incorrect:
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* {left: -5 ...}
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* {left: 0 ...}
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*/
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float padding[6];
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float border[6];
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float dimensions[2];
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float minDimensions[2];
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float maxDimensions[2];
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} CSSStyle;
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typedef struct CSSNode {
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CSSStyle style;
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CSSLayout layout;
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int lineIndex;
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bool shouldUpdate;
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bool isTextNode;
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CSSNodeRef parent;
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CSSNodeListRef children;
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bool isDirty;
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struct CSSNode* nextChild;
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CSSSize (*measure)(void *context, float width, CSSMeasureMode widthMode, float height, CSSMeasureMode heightMode);
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void (*print)(void *context);
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void *context;
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} CSSNode;
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CSS_EXTERN_C_END
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#endif
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