//TODO: optimise performance for single slot case
private Size CalculateLayout(Size areaSize, Rect[] slotPositions)
{
int[] columnSizes = new int[currentLayout.ColumnCount];
int[] rowSizes = new int[currentLayout.RowCount];
bool[] stretchableRows = new bool[currentLayout.RowCount];
TableLayoutPosition[] pss = new TableLayoutPosition[WaveChildren.Count];
bool relayoutNeeded = false;
// all rows are stretchable by default
for (int i = 0; i < stretchableRows.Length; i++)
{
stretchableRows[i] = true;
}
// retrieve all stored slot position data and discover all stretchable rows
for (int i = 0; i < WaveChildren.Count; i++)
{
pss[i] = TableLayout.GetSlotPosition(WaveChildren[i]);
if ((((RendererBase)WaveChildren[i]).Crop & CropStrategy.Stretch) != CropStrategy.Stretch)
{
stretchableRows[pss[i].Row] = false;
}
}
// size fixed-size columns based on single-column slots
for (int i = 0; i < WaveChildren.Count; i++)
{
if ((pss[i].ColumnSpan == 0) && (currentLayout.RelativeSizes[pss[i].Column] == 0))
{
WaveChildren[i].Measure(new Size(Double.PositiveInfinity, Double.PositiveInfinity));
if ((int)WaveChildren[i].DesiredSize.Width > columnSizes[pss[i].Column])
{
if (columnSizes[pss[i].Column] > 0)
{
relayoutNeeded = true;
}
columnSizes[pss[i].Column] = (int)WaveChildren[i].DesiredSize.Width;
}
}
}
// if width is undefined, we do not calculate relative columns - only absolute ones
if (!Double.IsInfinity(areaSize.Width))
{
// calculate total remaining width for relative columns
int remainingWidthForRelativeColumns = (int)areaSize.Width;
foreach (int columnSize in columnSizes)
{
remainingWidthForRelativeColumns -= columnSize;
}
// allocate remaining width to relative columns
if (remainingWidthForRelativeColumns > 0)
{
int totalFractions = 0;
for (int i = 0; i < currentLayout.RelativeSizes.Length; i++)
{
if (currentLayout.RelativeSizes[i] > 0)
{
totalFractions += currentLayout.RelativeSizes[i];
}
}
if (totalFractions > 0)
{
int fraction = remainingWidthForRelativeColumns / totalFractions;
if (fraction > 0)
{
for (int i = 0; i < currentLayout.RelativeSizes.Length; i++)
{
if (currentLayout.RelativeSizes[i] > 0)
{
columnSizes[i] = fraction * currentLayout.RelativeSizes[i];
}
}
}
}
}
// add remaining width to last relative column
remainingWidthForRelativeColumns = (int)areaSize.Width;
for (int i = 0; i < columnSizes.Length; i++)
{
remainingWidthForRelativeColumns -= columnSizes[i];
}
if (remainingWidthForRelativeColumns > 0)
{
for (int i = currentLayout.RelativeSizes.Length - 1; i == 0; i--)
{
if (currentLayout.RelativeSizes[i] > 0)
{
columnSizes[i] += remainingWidthForRelativeColumns;
remainingWidthForRelativeColumns = 0;
break;
}
}
}
// if there are no relative columns, update the block width to match the combined fixed-size column widths
if (remainingWidthForRelativeColumns > 0)
{
//TODO: update the block width to match the combined fixed-size column widths
}
}
// layout single-cell slots (both width and height)
for (int i = 0; i < WaveChildren.Count; i++)
{
if ((pss[i].ColumnSpan == 0) && (pss[i].RowSpan == 0))
{
if (columnSizes[pss[i].Column] > 0)
{
WaveChildren[i].Measure(new Size(columnSizes[pss[i].Column], Double.PositiveInfinity));
if (WaveChildren[i].DesiredSize.Height > rowSizes[pss[i].Row])
{
rowSizes[pss[i].Row] = (int)WaveChildren[i].DesiredSize.Height;
}
}
}
}
// layout single row multi column slots
for (int i = 0; i < WaveChildren.Count; i++)
{
if ((pss[i].ColumnSpan > 0) && (pss[i].RowSpan == 0))
{
int startColumnIndex = pss[i].Column;
int endColumnIndex = startColumnIndex + pss[i].ColumnSpan;
int childWidth = 0;
for (int j = startColumnIndex; j <= endColumnIndex; j++)
{
childWidth += columnSizes[j];
}
childWidth += pss[i].ColumnSpan * currentLayout.Spacing;
if (childWidth > 0)
{
WaveChildren[i].Measure(new Size(childWidth, Double.PositiveInfinity));
if ((int)WaveChildren[i].DesiredSize.Height > rowSizes[pss[i].Row])
{
if (rowSizes[pss[i].Row] > 0)
{
relayoutNeeded = true;
}
rowSizes[pss[i].Row] = (int)WaveChildren[i].DesiredSize.Height;
}
}
}
}
// layout multi row slots
for (int i = 0; i < WaveChildren.Count; i++)
{
if (pss[i].RowSpan > 0)
{
// calculate width for the slot
int slotWidth = 0;
if (pss[i].ColumnSpan > 0)
{
int startColumnIndex = pss[i].Column;
int endColumnIndex = startColumnIndex + pss[i].ColumnSpan;
for (int j = startColumnIndex; j <= endColumnIndex; j++)
{
slotWidth += columnSizes[j];
}
slotWidth += pss[i].ColumnSpan * currentLayout.Spacing;
}
else
{
slotWidth = columnSizes[pss[i].Column];
}
// calculate space available for the slot
int startRowIndex = pss[i].Row;
int endRowIndex = startRowIndex + pss[i].RowSpan;
int availableHeightForSlot = 0;
for (int j = startRowIndex; j <= endRowIndex; j++)
{
availableHeightForSlot += rowSizes[j];
}
// get slot's preferred height
WaveChildren[i].Measure(new Size(slotWidth, Double.PositiveInfinity));
// make adjustments
if (WaveChildren[i].DesiredSize.Height > availableHeightForSlot)
{
relayoutNeeded = true;
int numberOfStretchableRows = 0;
for (int j = startRowIndex; j <= endRowIndex; j++)
{
if (stretchableRows[j])
{
numberOfStretchableRows++;
}
}
if (numberOfStretchableRows > 0)
{
int[] stretchableRowIndices = new int[numberOfStretchableRows];
int[] stretchableRowWeights = new int[numberOfStretchableRows];
int stretchableWeightsSum = 0;
for (int j = startRowIndex; j <= endRowIndex; j++)
{
if (stretchableRows[j])
{
stretchableRowIndices[j - startRowIndex] = j;
stretchableRowWeights[j - startRowIndex] = (currentLayout.StretchWeights != null) ? currentLayout.StretchWeights[j] : 1;
stretchableWeightsSum += stretchableRowWeights[j - startRowIndex];
}
}
if ((WaveChildren[i].DesiredSize.Height - availableHeightForSlot) >= 1)
{
int sizeToRedistribute = (int)(WaveChildren[i].DesiredSize.Height - availableHeightForSlot);
int singleAddonUnit = 0;
if (stretchableWeightsSum == 0)
{
singleAddonUnit = sizeToRedistribute / numberOfStretchableRows;
if (singleAddonUnit > 0)
{
for (int k = 0; k < stretchableRowIndices.Length; k++)
{
rowSizes[stretchableRowIndices[k]] += singleAddonUnit;
}
}
}
else
{
singleAddonUnit = sizeToRedistribute / stretchableWeightsSum;
if (singleAddonUnit > 0)
{
for (int k = 0; k < stretchableRowIndices.Length; k++)
{
if (stretchableRowWeights[k] > 0)
{
rowSizes[stretchableRowIndices[k]] += stretchableRowWeights[k] * singleAddonUnit;
}
}
}
}
}
}
}
}
}
//TODO: if in any of the previous 3 steps stretch happened - relayout all slots
if (relayoutNeeded)
{
/////////////
}
// prepare slot positions if requested
if (slotPositions != null)
{
int x = Padding.Left, y = Padding.Top;
int[] columnXs = new int[currentLayout.ColumnCount];
int[] rowYs = new int[currentLayout.RowCount];
// calculate column X coordinates
for (int i = 0; i < columnXs.Length; i++)
{
columnXs[i] = x;
x += columnSizes[i];
x += currentLayout.Spacing;
}
// calculate row Y coordinates
for (int i = 0; i < rowYs.Length; i++)
{
rowYs[i] = y;
y += rowSizes[i];
y += currentLayout.Spacing;
}
// calculate actual slot positions
for (int i = 0; i < WaveChildren.Count; i++)
{
double slotWidth = 0, slotHeight = 0;
if (pss[i].ColumnSpan > 0)
{
int startColumnIndex = pss[i].Column;
int endColumnIndex = startColumnIndex + pss[i].ColumnSpan;
for (int j = startColumnIndex; j <= endColumnIndex; j++)
{
slotWidth += columnSizes[j];
}
slotWidth += pss[i].ColumnSpan * currentLayout.Spacing;
}
else
{
slotWidth = columnSizes[pss[i].Column];
}
if (pss[i].RowSpan > 0)
{
int startRowIndex = pss[i].Row;
int endRowIndex = startRowIndex + pss[i].RowSpan;
for (int j = startRowIndex; j <= endRowIndex; j++)
{
slotHeight += rowSizes[j];
}
slotHeight += pss[i].RowSpan * currentLayout.Spacing;
}
else
{
slotHeight = rowSizes[pss[i].Row];
}
slotPositions[i] = new Rect(
columnXs[pss[i].Column], rowYs[pss[i].Row],
slotWidth, slotHeight);
}
}
// calculate final control size
double finalWidth = 0, finalHeight = 0;
foreach (int columnSize in columnSizes)
{
finalWidth += columnSize;
}
finalWidth += (columnSizes.Length - 1) * currentLayout.Spacing;
finalWidth += Padding.Left;
finalWidth += Padding.Right;
foreach (int rowSize in rowSizes)
{
finalHeight += rowSize;
}
finalHeight += (rowSizes.Length - 1) * currentLayout.Spacing;
finalHeight += Padding.Top;
finalHeight += Padding.Bottom;
if (!Double.IsInfinity(areaSize.Width) && (finalWidth > areaSize.Width))
{
finalWidth = areaSize.Width;
}
if (!Double.IsInfinity(areaSize.Height) && (finalHeight > areaSize.Height))
{
finalHeight = areaSize.Height;
}
return(new Size(finalWidth, finalHeight));
}
public static void SetSlotPosition(UIElement element, TableLayoutPosition value)
{
element.SetValue(SlotPositionProperty, value);
}