GridLayout.h

#pragma once
 
#include "LayoutHost.h"
#include "List.h"
 
namespace sw
{
    struct GridLayoutTag {
        uint16_t row;
 
        uint16_t column;
 
        uint16_t rowSpan;
 
        uint16_t columnSpan;
 
        GridLayoutTag();
 
        GridLayoutTag(uint16_t row, uint16_t column, uint16_t rowSpan, uint16_t columnSpan);
 
        GridLayoutTag(uint16_t row, uint16_t column);
 
        GridLayoutTag(uint64_t layoutTag);
 
        operator uint64_t() const;
    };
 
    enum class GridRCType {
        FixSize,    // 固定大小
        AutoSize,   // 自动大小
        FillRemain, // 填充剩余空间
    };
 
    struct GridRow {
        GridRCType type;
 
        double height;
 
        GridRow();
 
        GridRow(GridRCType type, double height);
 
        GridRow(double height);
    };
 
    struct FixSizeGridRow : public GridRow {
        FixSizeGridRow(double height);
    };
 
    struct AutoSizeGridRow : public GridRow {
        AutoSizeGridRow();
    };
 
    struct FillRemainGridRow : public GridRow {
        FillRemainGridRow(double proportion = 1);
    };
 
    struct GridColumn {
        GridRCType type;
 
        double width;
 
        GridColumn();
 
        GridColumn(GridRCType type, double width);
 
        GridColumn(double width);
    };
 
    struct FixSizeGridColumn : public GridColumn {
        FixSizeGridColumn(double width);
    };
 
    struct AutoSizeGridColumn : public GridColumn {
        AutoSizeGridColumn();
    };
 
    struct FillRemainGridColumn : public GridColumn {
        FillRemainGridColumn(double proportion = 1);
    };
 
    class GridLayout : public LayoutHost
    {
    private:
        struct _ChildInfo {
            ILayout *instance;         // 子元素对象
            GridLayoutTag layoutTag;   // 布局标记
            GridRCType rowMeasureType; // 元素measure行时的类型
            GridRCType colMeasureType; // 元素measure列时的类型
        };
 
        struct _RowInfo {
            GridRow row;           // 行
            double size       = 0; // 所需空间大小
            double proportion = 0; // 类型为FillRemain时该字段保存该行的高度占比，范围为0~1
        };
 
        struct _ColInfo {
            GridColumn col;        // 列
            double size       = 0; // 所需空间大小
            double proportion = 0; // 类型为FillRemain时该字段保存该列的宽度占比，范围为0~1
        };
 
        struct {
            std::vector<_RowInfo> rowsInfo;       // 行信息
            std::vector<_ColInfo> colsInfo;       // 列信息
            std::vector<_ChildInfo> childrenInfo; // 子元素信息
            std::vector<Rect> cells;              // 保存格信息
        } _internalData;
 
    public:
        List<GridRow> rows;
 
        List<GridColumn> columns;
 
        virtual Size MeasureOverride(const Size &availableSize) override;
 
        virtual void ArrangeOverride(const Size &finalSize) override;
 
    private:
        void _UpdateInternalData();
 
        Rect &_GetCell(int row, int col);
    };
}