Layout.h

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#pragma once
 
#include "ui/UIHost.h"
 
#include <vector>
 
namespace eve::ui {
 
struct FlexItemSpec {
    float basisMain = 0.f;        // measured content size on main axis
    float basisCross = 0.f;       // measured content size on cross axis
    float marginBefore = 0.f;     // leading main-axis margin
    float marginAfter = 0.f;      // trailing main-axis margin
    float marginCrossBefore = 0.f;
    float marginCrossAfter = 0.f;
    float flexGrow = 0.f;
    bool isSpacer = false;        // default grow = 1
    bool absolute = false;        // excluded from flex flow
    float anchorMain = 0.f;       // 0..1 anchor point inside content box
    float anchorCross = 0.f;
    float posMain = 0.f;          // offset from the anchored edge
    float posCross = 0.f;
    float percentMain = 0.f;      // 0..1 of available main size; overrides basis
    float percentCross = 0.f;
    float minMain = 0.f;
    float maxMain = 0.f;
    float minCross = 0.f;
    float maxCross = 0.f;
    float explicitMain = 0.f;     // >0 overrides basisMain (fixed size)
    float explicitCross = 0.f;    // >0 overrides basisCross
    int alignSelf = -1;
};
 
struct FlexRect {
    float x = 0.f;
    float y = 0.f;
    float w = 0.f;
    float h = 0.f;
};
 
struct FlexResult {
    std::vector<FlexRect> items;  // one per non-absolute item, same order
    float contentW = 0.f;         // total outer extent on X
    float contentH = 0.f;         // total outer extent on Y
};
 
FlexResult flexArrange(bool row, float gap, float availMain, float availCross,
                       FlexAlign containerAlign, FlexJustify justify,
                       const std::vector<FlexItemSpec> &items);
 
void measureNode(UIHost::Tree &tree, int index);
 
void measureTree(UIHost::Tree &tree);
 
void measureFlowChildren(UIHost::Tree &tree, int firstChild, float *outW, float *outH);
 
}  // namespace eve::ui