internal CellItem GetViewportCell(int row, int column, bool containsSpan)
{
CellItem cell = null;
RowItem presenter = _rowsLayer.GetRow(row);
if (presenter != null)
{
cell = presenter.GetCell(column);
}
if (containsSpan && (cell == null))
{
foreach (RowItem presenter2 in _rowsLayer.Rows)
{
if (presenter2 != null)
{
foreach (CellItem base3 in presenter2.Cells.Values)
{
if (((base3 != null) && (base3.CellLayout != null)) && ((base3.CellLayout.Row == row) && (base3.CellLayout.Column == column)))
{
return(base3);
}
}
}
}
}
return(cell);
}
public CellItem(RowItem p_rowItem)
{
OwnRow = p_rowItem;
Column = -1;
_tb = new TextBlock {
VerticalAlignment = VerticalAlignment.Center, TextTrimming = TextTrimming.CharacterEllipsis
};
Children.Add(_tb);
}
protected override Size MeasureOverride(Size availableSize)
{
if (_owner.Excel.CanCellOverflow)
{
int viewportLeftColumn = _owner.Excel.GetViewportLeftColumn(_owner.ColumnViewportIndex);
_owner.CellOverflowLayoutBuildEngine.ViewportLeftColumn = viewportLeftColumn;
int viewportRightColumn = _owner.Excel.GetViewportRightColumn(_owner.ColumnViewportIndex);
_owner.CellOverflowLayoutBuildEngine.ViewportRightColumn = viewportRightColumn;
}
// 频繁增删Children子元素会出现卡顿现象！
// Children = _rows + _recycledRows
RowLayoutModel rowLayoutModel = _owner.GetRowLayoutModel();
int less = rowLayoutModel.Count - Children.Count;
if (less > 0)
{
for (int i = 0; i < less; i++)
{
RowItem rowItem = new RowItem(_owner);
Children.Add(rowItem);
_recycledRows.Add(rowItem);
}
}
// 先回收不可见行
List <RowItem> rows = _rows.Values.ToList();
foreach (var rowItem in rows)
{
RowLayout layout = rowLayoutModel.FindRow(rowItem.Row);
if (layout == null || layout.Height <= 0.0)
{
_recycledRows.Add(rowItem);
_rows.Remove(rowItem.Row);
rowItem.Row = -1;
rowItem.CleanUpBeforeDiscard();
}
}
double y = _owner.Location.Y;
double left = 0.0;
foreach (RowLayout layout in rowLayoutModel)
{
if (layout.Height <= 0.0)
{
continue;
}
bool updateAllCell = false;
RowItem rowItem = null;
if (!_rows.TryGetValue(layout.Row, out rowItem))
{
// 重新利用回收的行
rowItem = _recycledRows[0];
_recycledRows.RemoveAt(0);
rowItem.Row = layout.Row;
_rows.Add(layout.Row, rowItem);
updateAllCell = true;
}
rowItem.Location = new Point(_owner.Location.X, y);
rowItem.UpdateChildren(updateAllCell);
int z = rowItem.ContainsSpanCell ? _spanRowZIndexBase + rowItem.Row : _normalZIndexBase + rowItem.Row;
z = z % 0x7ffe;
Canvas.SetZIndex(rowItem, z);
// 测量尺寸足够大，否则当单元格占多行时在uno上只绘一行！
rowItem.Measure(availableSize);
y += layout.Height;
left = Math.Max(left, rowItem.DesiredSize.Width);
}
// 测量回收的行
if (_recycledRows.Count > 0)
{
foreach (var rowItem in _recycledRows)
{
rowItem.Measure(_szEmpty);
}
}
return(new Size(left + _owner.Location.X, y));
}