protected override Size MeasureVirRows()
{
// 列头
_colHeader.Measure(new Size(_maxSize.Width - _topLeftWidth, _maxSize.Height));
_topLeft.Measure(new Size(_topLeftWidth, _colHeader.DesiredSize.Height));
double height = _colHeader.DesiredSize.Height;
// 超过宽度时水平滚动
double maxWidth = Math.Max(_maxSize.Width, _owner.Cols.TotalWidth + _topLeftWidth);
// 数据行
if (_dataRows.Count > 0)
{
// 重新测量
Size testSize = new Size(maxWidth, _rowHeight);
// 表格时始终重置宽度，若只在创建时确定列宽，造成调整列宽时不一致！
_finalWidth = 0;
foreach (var row in _dataRows)
{
row.Measure(testSize);
if (row.DesiredSize.Width > _finalWidth)
{
_finalWidth = row.DesiredSize.Width;
}
}
}
height += _rowHeight * _owner.Rows.Count;
// 分组行
Size size = new Size(_finalWidth, _maxSize.Height);
if (_owner.GroupRows != null)
{
double top = 0;
foreach (var grp in _owner.GroupRows)
{
grp.Top = top;
grp.Measure(size);
height += grp.DesiredSize.Height;
top += grp.DesiredSize.Height;
top += grp.Data.Count * _rowHeight;
}
}
// 分组导航头，出现垂直滚动栏时才显示
if (_groupHeader != null && height > _maxSize.Height)
{
_groupHeader.Measure(size);
height += _groupHeader.DesiredSize.Height;
// 增加高度使最底部分组能够滚动到顶部，确保和导航位置同步！
var group = _owner.GroupRows[_owner.GroupRows.Count - 1];
double delta = _maxSize.Height - _colHeader.DesiredSize.Height - _groupHeader.DesiredSize.Height - group.DesiredSize.Height - group.Data.Count * _rowHeight;
// 因uno加1
if (delta > 0)
{
height += delta + 1;
}
}
return(new Size(_finalWidth, height));
}
