public HeaderCellItem GetViewportCell(int row, int column, bool containsSpan)
{
HeaderCellItem cell = null;
HeaderItem presenter = GetRow(row);
if (presenter != null)
{
cell = presenter.GetCell(column);
}
if (containsSpan && cell == null)
{
foreach (HeaderItem item in _rows.Values)
{
if (item != null)
{
foreach (var ci in item.Cells.Values)
{
if (((ci != null) && (ci.CellLayout != null)) && ((ci.CellLayout.Row == row) && (ci.CellLayout.Column == column)))
{
return(ci);
}
}
}
}
}
return(cell);
}
protected override Size ArrangeOverride(Size finalSize)
{
if (Row == -1 || finalSize.Width == 0 || finalSize.Height == 0)
{
if (Children.Count > 0)
{
foreach (UIElement elem in Children)
{
elem.Arrange(_rcEmpty);
}
}
return(finalSize);
}
ColumnLayoutModel colLayoutModel = GetColumnLayoutModel();
RowLayout layout = Owner.GetRowLayoutModel().FindRow(Row);
foreach (ColumnLayout colLayout in colLayoutModel)
{
if (colLayout.Width <= 0.0)
{
continue;
}
HeaderCellItem cell = GetCell(colLayout.Column);
if (cell != null)
{
double x = colLayout.X;
double y = layout.Y;
double width = colLayout.Width;
double height = layout.Height;
int num5 = 0x2710 + colLayout.Column;
CellLayout cellLayout = cell.CellLayout;
if (cellLayout != null)
{
x = cellLayout.X;
y = cellLayout.Y;
width = cellLayout.Width;
height = cellLayout.Height;
num5 = 0x4e20 + colLayout.Column;
}
num5 = num5 % 0x7ffe;
Canvas.SetZIndex(cell, num5);
cell.Arrange(new Rect(x - Location.X, y - Location.Y, width, height));
}
}
if (_recycledCells.Count > 0)
{
foreach (var cell in _recycledCells)
{
cell.Arrange(_rcEmpty);
}
}
return(finalSize);
}
protected override Size MeasureOverride(Size availableSize)
{
if (Row == -1 ||
availableSize.Width == 0.0 ||
availableSize.Height == 0.0)
{
return(new Size());
}
ColumnLayoutModel colLayoutModel = GetColumnLayoutModel();
RowLayout layout = Owner.GetRowLayoutModel().FindRow(Row);
RowWidth = 0.0;
double height = 0.0;
foreach (ColumnLayout colLayout in colLayoutModel)
{
RowWidth += colLayout.Width;
HeaderCellItem cell = GetCell(colLayout.Column);
if (cell == null)
{
continue;
}
CellLayout cellLayout = cell.CellLayout;
if (cellLayout != null)
{
cell.Measure(new Size(cellLayout.Width, cellLayout.Height));
if (cellLayout.Height > height)
{
height = cellLayout.Height;
}
}
else
{
cell.Measure(new Size(colLayout.Width, layout.Height));
if (layout.Height > height)
{
height = layout.Height;
}
}
}
if (_recycledCells.Count > 0)
{
foreach (var cell in _recycledCells)
{
cell.Measure(_szEmpty);
}
}
double width = Math.Min(RowWidth, Owner.GetViewportSize().Width);
return(new Size(width, height));
}
//*** HeaderPanel.Measure -> HeaderItem.UpdateChildren -> 行列改变时 HeaderCellItem.UpdateChildren -> HeaderItem.Measure -> HeaderCellItem.Measure ***//
public void UpdateChildren(bool p_updateAllCell)
{
// 频繁增删Children子元素会出现卡顿现象！
// Children = Cells + _recycledCells
ColumnLayoutModel colLayoutModel = GetColumnLayoutModel();
int less = colLayoutModel.Count - Children.Count;
if (less > 0)
{
for (int i = 0; i < less; i++)
{
var cell = (Owner.Area == SheetArea.ColumnHeader) ?
(HeaderCellItem) new ColHeaderCell(this) : new RowHeaderCell(this);
Children.Add(cell);
_recycledCells.Add(cell);
}
}
// 先回收不可见格
var cols = Cells.Values.ToList();
foreach (var cell in cols)
{
ColumnLayout layout = colLayoutModel.FindColumn(cell.Column);
if (layout == null || layout.Width <= 0.0)
{
PushRecycledCell(cell);
}
}
int updateCells = 0;
ContainsSpanCell = false;
SpanGraph cachedSpanGraph = Owner.CachedSpanGraph;
for (int i = 0; i < colLayoutModel.Count; i++)
{
ColumnLayout colLayout = colLayoutModel[i];
if (colLayout.Width <= 0.0)
{
continue;
}
byte state = cachedSpanGraph.GetState(Row, colLayout.Column);
CellLayout layout = null;
if (state > 0)
{
CellLayoutModel cellLayoutModel = Owner.GetCellLayoutModel();
if (cellLayoutModel != null)
{
layout = cellLayoutModel.FindCell(Row, colLayout.Column);
if (layout != null)
{
ContainsSpanCell = true;
}
}
}
HeaderCellItem cell = GetCell(colLayout.Column);
bool rangeChanged = false;
if (layout != null && layout.Width > 0.0 && layout.Height > 0.0)
{
CellRange range = ClipCellRange(layout.GetCellRange());
rangeChanged = (Row != range.Row) || (range.Column != colLayout.Column);
// 跨多列
if (layout.ColumnCount > 1)
{
// 移除跨度区域内的所有格
int maxCol = (layout.Column + layout.ColumnCount) - 1;
for (int j = i + 1; j < colLayoutModel.Count; j++)
{
int curCol = colLayoutModel[j].Column;
if (curCol > maxCol)
{
break;
}
i = j;
var ci = GetCell(curCol);
if (ci != null)
{
PushRecycledCell(ci);
}
}
}
}
// 跨度不同不显示
if (rangeChanged)
{
if (cell != null)
{
PushRecycledCell(cell);
}
continue;
}
bool updated = false;
if (cell == null)
{
// 重新利用回收的格
cell = _recycledCells[0];
_recycledCells.RemoveAt(0);
cell.Column = colLayout.Column;
Cells.Add(colLayout.Column, cell);
updated = true;
}
cell.CellLayout = layout;
if (p_updateAllCell || updated)
{
cell.UpdateChildren();
updateCells++;
}
}
#if !IOS
// iOS在 MeasureOverride 内部调用子元素的 InvalidateMeasure 会造成死循环！
// 不重新测量会造成如：迷你图忽大忽小的情况
if (updateCells > 0)
{
InvalidateMeasure();
}
#endif
}
void PushRecycledCell(HeaderCellItem cell)
{
_recycledCells.Add(cell);
Cells.Remove(cell.Column);
cell.Column = -1;
}
