コード例 #1
0
        protected override Size MeasureOverride(Size availableSize)
        {
            BuildSpanGraph();

            // 频繁增删Children子元素会出现卡顿现象!
            // Children = _rows + _recycledRows
            RowLayoutModel rowLayoutModel = GetRowLayoutModel();
            int            less           = rowLayoutModel.Count - Children.Count;

            if (less > 0)
            {
                for (int i = 0; i < less; i++)
                {
                    HeaderItem rowItem = new HeaderItem(this);
                    Children.Add(rowItem);
                    _recycledRows.Add(rowItem);
                }
            }

            // 先回收不可见行
            List <HeaderItem> 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;
                }
            }

            double x        = Location.X;
            double y        = Location.Y;
            double maxWidth = 0.0;

            foreach (RowLayout layout in rowLayoutModel)
            {
                if (layout.Height <= 0.0)
                {
                    continue;
                }

                bool       updateAllCell = false;
                HeaderItem 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.UpdateChildren(updateAllCell);

                int z = rowItem.ContainsSpanCell ? _spanRowZIndexBase + rowItem.Row : _normalZIndexBase + rowItem.Row;
                z = z % 0x7ffe;
                Canvas.SetZIndex(rowItem, z);

                rowItem.Location = new Point(x, y);
                // 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;
                maxWidth = Math.Max(maxWidth, rowItem.DesiredSize.Width);
            }

            // 测量回收的行
            if (_recycledRows.Count > 0)
            {
                foreach (var rowItem in _recycledRows)
                {
                    rowItem.Measure(_szEmpty);
                }
            }
            return(new Size(maxWidth + Location.X, y));
        }
コード例 #2
0
 public RowHeaderCell(HeaderItem p_rowItem)
     : base(p_rowItem)
 {
 }
コード例 #3
0
 public ColHeaderCell(HeaderItem p_rowItem)
     : base(p_rowItem)
 {
 }