private void RecalculateColumns(TablePanelRow requestor)
{
if (this.columnsWidthsPerRow.Count != 0)
{
int NumberOfColumns = this.columnsWidthsPerRow.Max(entry => entry.Value.Length);
double[] ColumnWidths = new double[NumberOfColumns];
for (int Index = 0; Index < NumberOfColumns; Index++)
{
// ReSharper disable AccessToModifiedClosure
ColumnWidths[Index] = this.columnsWidthsPerRow.Max(entry => Index < entry.Value.Length ? entry.Value[Index] : 0);
// ReSharper restore AccessToModifiedClosure
}
if (ColumnWidths.HasEqualValue(this.columnWidths, (v1, v2) => Math.Abs(v1 - v2) < 0.0001) == false)
{
this.columnWidths = ColumnWidths;
this.rowsToLayout.Clear();
this.rowsToLayout.AddRange(this.columnsWidthsPerRow.Keys);
}
//Row will already be layouted with current values -> remove from re-layout list
this.rowsToLayout.Remove(requestor);
}
else
{
this.columnWidths = new double[0];
}
}
internal void Remove(TablePanelRow tablePanelRow)
{
if (this.columnsWidthsPerRow.ContainsKey(tablePanelRow))
{
this.columnsWidthsPerRow.Remove(tablePanelRow);
}
this.RecalculateColumns(null);
}
internal void UpdateColumnWidths(TablePanelRow tablePanelRow, ref double[] columnWidths)
{
if (this.columnsWidthsPerRow.ContainsKey(tablePanelRow))
{
this.columnsWidthsPerRow.Remove(tablePanelRow);
}
this.columnsWidthsPerRow.Add(tablePanelRow, (double[])columnWidths.Clone()); //Clone!! Arrays are per-ref!
this.RecalculateColumns(tablePanelRow);
Array.Copy(this.columnWidths, columnWidths, columnWidths.Length);
}
/// <summary>
/// When overridden in a derived class, positions child elements and determines a size for a <see cref="T:System.Windows.FrameworkElement"/> derived class.
/// </summary>
/// <returns>
/// The actual size used.
/// </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)
{
foreach (UIElement Child in this.Children)
{
int Column = TablePanelRow.GetColumn(Child);
Rect ChildRect = new Rect(
Math.Min(this.columnOffsets[Column], finalSize.Width), 0,
Math.Min(this.columnWidths[Column], finalSize.Width - this.columnOffsets[Column]), finalSize.Height);
Child.Arrange(ChildRect);
}
return(finalSize);
}
/// <summary>
/// When overridden in a derived class, measures the size in layout required for child elements and determines a size for the <see cref="T:System.Windows.FrameworkElement"/>-derived class.
/// </summary>
/// <returns>
/// The size that this element determines it needs during layout, based on its calculations of child element sizes.
/// </returns>
/// <param name="availableSize">The available size that this element can give to child elements. Infinity can be specified as a value to indicate that the element will size to whatever content is available.</param>
protected override Size MeasureOverride(Size availableSize)
{
this.UpdateTablePanelRoot();
this.UpdateMargin();
int LastColumnIndex = 0;
foreach (UIElement Child in this.Children)
{
int Column = TablePanelRow.GetColumn(Child);
LastColumnIndex = Math.Max(LastColumnIndex, Column);
Child.Measure(availableSize);
}
double[] ColumnWidths = new double[LastColumnIndex + 1];
this.measuredHeight = 0;
foreach (UIElement Child in this.Children)
{
int Column = TablePanelRow.GetColumn(Child);
Size DesiredSize = Child.DesiredSize;
this.measuredHeight = Math.Max(this.measuredHeight, DesiredSize.Height);
ColumnWidths[Column] = Math.Max(ColumnWidths[Column], DesiredSize.Width);
}
//Add the offset to the first cell
ColumnWidths[0] += this.margin;
// Update Column Widths and retrieve the accumulated ones
this.panelRoot.UpdateColumnWidths(this, ref ColumnWidths);
//Subtract the offset again to have the layout values
ColumnWidths[0] -= this.margin;
//Remember for arrange
this.columnWidths = ColumnWidths;
//Calculate cell offsets from widths for arrange
this.columnOffsets = new double[ColumnWidths.Length];
double ColumnOffset = 0;
for (int Index = 0; Index < ColumnWidths.Length; Index++)
{
this.columnOffsets[Index] = ColumnOffset;
ColumnOffset += ColumnWidths[Index];
}
Size NeededSize = new Size(ColumnWidths.Sum(), this.measuredHeight);
return(NeededSize);
}
