108 lines
3.0 KiB
C#
108 lines
3.0 KiB
C#
using UnityEngine;
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namespace XericUI.XTable.Rendering
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{
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/// <summary>
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/// 左上角坐标系的视图矩形。
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/// Unity 的 Rect 是左下角原点(Y-up)，表格数据索引是左上角原点(Y-down)。
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/// 此类负责坐标转换和可见单元格范围计算。
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/// </summary>
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public struct XTableViewRect
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{
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/// <summary>左上角 X 坐标</summary>
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public float X;
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/// <summary>左上角 Y 坐标（从上到下递增）</summary>
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public float Y;
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/// <summary>视图宽度</summary>
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public float Width;
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/// <summary>视图高度</summary>
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public float Height;
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/// <summary>右边界</summary>
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public float XMax => X + Width;
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/// <summary>下边界</summary>
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public float YMax => Y + Height;
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/// <summary>
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/// 从 Unity Rect（左下角原点）转换为 TableViewRect（左上角原点）
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/// </summary>
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/// <param name="unityRect">Unity 坐标系下的矩形</param>
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/// <param name="containerHeight">容器总高度（用于 Y 轴翻转）</param>
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public static XTableViewRect FromUnityRect(Rect unityRect, float containerHeight)
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{
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return new XTableViewRect
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{
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X = unityRect.xMin,
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Y = containerHeight - unityRect.yMax,
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Width = unityRect.width,
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Height = unityRect.height
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};
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}
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/// <summary>
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/// 转换为 Unity Rect（左下角原点）
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/// </summary>
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public Rect ToUnityRect(float containerHeight)
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{
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return new Rect(X, containerHeight - Y - Height, Width, Height);
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}
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/// <summary>
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/// 通过行列尺寸计算可见单元格范围。
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/// 累加行高/列宽直到超出视图范围。
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/// </summary>
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/// <param name="rowHeights">每行高度数组</param>
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/// <param name="colWidths">每列宽度数组</param>
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/// <param name="startRow">可见起始行（包含）</param>
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/// <param name="endRow">可见结束行（不包含）</param>
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/// <param name="startCol">可见起始列（包含）</param>
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/// <param name="endCol">可见结束列（不包含）</param>
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public void GetVisibleCellRange(
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float[] rowHeights, float[] colWidths,
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out int startRow, out int endRow,
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out int startCol, out int endCol)
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{
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startRow = 0;
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endRow = 0;
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startCol = 0;
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endCol = 0;
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if (rowHeights == null || colWidths == null) return;
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// 计算行范围（Y 方向，从上到下）
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float accumulatedY = 0f;
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for (int r = 0; r < rowHeights.Length; r++)
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{
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float rowBottom = accumulatedY + rowHeights[r];
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if (rowBottom > Y && accumulatedY < YMax)
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{
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if (startRow == 0 && accumulatedY < YMax)
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startRow = r;
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endRow = r + 1;
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}
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accumulatedY = rowBottom;
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if (accumulatedY > YMax) break;
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}
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// 计算列范围（X 方向，从左到右）
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float accumulatedX = 0f;
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for (int c = 0; c < colWidths.Length; c++)
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{
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float colRight = accumulatedX + colWidths[c];
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if (colRight > X && accumulatedX < XMax)
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{
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if (startCol == 0 && accumulatedX < XMax)
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startCol = c;
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endCol = c + 1;
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}
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accumulatedX = colRight;
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if (accumulatedX > XMax) break;
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}
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}
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}
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}
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