/// <summary>
/// Arranges the content of the <see cref="T:System.Windows.Controls.Primitives.DataGridCellsPresenter"/>.
/// </summary>
/// <returns>
/// The actual size used by the <see cref="T:System.Windows.Controls.Primitives.DataGridCellsPresenter"/>.
/// </returns>
/// <param name="finalSize">
/// The final area within the parent that this element should use to arrange itself and its children.
/// </param>
protected override Size ArrangeOverride(Size finalSize)
{
if (this.OwningGrid == null)
{
return(base.ArrangeOverride(finalSize));
}
if (this.OwningGrid.AutoSizingColumns)
{
// When we initially load an auto-column, we have to wait for all the rows to be measured
// before we know its final desired size. We need to trigger a new round of measures now
// that the final sizes have been calculated.
this.OwningGrid.AutoSizingColumns = false;
return(base.ArrangeOverride(finalSize));
}
double frozenLeftEdge = 0;
double scrollingLeftEdge = -this.OwningGrid.HorizontalOffset;
double cellLeftEdge;
foreach (DataGridColumn column in this.OwningGrid.ColumnsInternal.GetVisibleColumns())
{
DataGridCell cell = this.OwningRow.Cells[column.Index];
Debug.Assert(cell.OwningColumn == column, "Expected column owner.");
Debug.Assert(column.IsVisible, "Expected visible column.");
if (column.IsFrozen)
{
cellLeftEdge = frozenLeftEdge;
// This can happen before or after clipping because frozen cells aren't clipped
frozenLeftEdge += column.ActualWidth;
}
else
{
cellLeftEdge = scrollingLeftEdge;
}
if (cell.Visibility == Visibility.Visible)
{
cell.Arrange(new Rect(cellLeftEdge, 0, column.LayoutRoundedWidth, finalSize.Height));
EnsureCellClip(cell, column.ActualWidth, finalSize.Height, frozenLeftEdge, scrollingLeftEdge);
}
scrollingLeftEdge += column.ActualWidth;
column.IsInitialDesiredWidthDetermined = true;
}
_fillerLeftEdge = scrollingLeftEdge;
// FillerColumn.Width == 0 when the filler column is not active
this.OwningRow.FillerCell.Arrange(new Rect(_fillerLeftEdge, 0, this.OwningGrid.ColumnsInternal.FillerColumn.FillerWidth, finalSize.Height));
return(finalSize);
}
protected override Size ArrangeOverride(Size finalSize)
{
if (this.OwningGrid != null)
{
double frozenLeftEdge = 0;
double scrollingLeftEdge = -this.OwningGrid.HorizontalOffset;
double cellLeftEdge;
DataGridColumn column = this.OwningGrid.ColumnsInternal.FirstVisibleColumn;
Debug.Assert(column == null || column.DisplayIndex >= 0);
while (column != null)
{
DataGridCell cell = this.OwningRow.Cells[column.Index];
Debug.Assert(cell.OwningColumn == column);
Debug.Assert(column.Visibility == Visibility.Visible);
if (column.IsFrozen)
{
cellLeftEdge = frozenLeftEdge;
// This can happen before or after clipping because frozen cells aren't clipped
frozenLeftEdge += column.ActualWidth;
}
else
{
cellLeftEdge = scrollingLeftEdge;
}
if (cell.Visibility == Visibility.Visible)
{
cell.Arrange(new Rect(cellLeftEdge, 0, column.ActualWidth, finalSize.Height));
EnsureCellClip(cell, column.ActualWidth, finalSize.Height, frozenLeftEdge, scrollingLeftEdge);
}
scrollingLeftEdge += column.ActualWidth;
column = this.OwningGrid.ColumnsInternal.GetNextVisibleColumn(column);
}
_fillerLeftEdge = scrollingLeftEdge;
// FillerColumn.Width == 0 when the filler column is not active
this.OwningRow.FillerCell.Arrange(new Rect(_fillerLeftEdge, 0, this.OwningGrid.ColumnsInternal.FillerColumn.Width, finalSize.Height));
return(finalSize);
}
return(base.ArrangeOverride(finalSize));
}