/// <summary>
/// Measures the grid.
/// </summary>
/// <param name="constraint">The available size.</param>
/// <returns>The desired size of the control.</returns>
protected override Size MeasureOverride(Size constraint)
{
Size totalSize = constraint;
int colCount = ColumnDefinitions.Count;
int rowCount = RowDefinitions.Count;
double totalStarsX = 0;
double totalStarsY = 0;
bool emptyRows = rowCount == 0;
bool emptyCols = colCount == 0;
bool hasChildren = Children.Count > 0;
if (emptyRows)
{
rowCount = 1;
}
if (emptyCols)
{
colCount = 1;
}
CreateMatrices(rowCount, colCount);
if (emptyRows)
{
_rowMatrix[0, 0] = new Segment(0, 0, double.PositiveInfinity, GridUnitType.Star);
_rowMatrix[0, 0].Stars = 1.0;
totalStarsY += 1.0;
}
else
{
for (int i = 0; i < rowCount; i++)
{
RowDefinition rowdef = RowDefinitions[i];
GridLength height = rowdef.Height;
rowdef.ActualHeight = double.PositiveInfinity;
_rowMatrix[i, i] = new Segment(0, rowdef.MinHeight, rowdef.MaxHeight, height.GridUnitType);
if (height.GridUnitType == GridUnitType.Pixel)
{
_rowMatrix[i, i].OfferedSize = Clamp(height.Value, _rowMatrix[i, i].Min, _rowMatrix[i, i].Max);
_rowMatrix[i, i].DesiredSize = _rowMatrix[i, i].OfferedSize;
rowdef.ActualHeight = _rowMatrix[i, i].OfferedSize;
}
else if (height.GridUnitType == GridUnitType.Star)
{
_rowMatrix[i, i].OfferedSize = Clamp(0, _rowMatrix[i, i].Min, _rowMatrix[i, i].Max);
_rowMatrix[i, i].DesiredSize = _rowMatrix[i, i].OfferedSize;
_rowMatrix[i, i].Stars = height.Value;
totalStarsY += height.Value;
}
else if (height.GridUnitType == GridUnitType.Auto)
{
_rowMatrix[i, i].OfferedSize = Clamp(0, _rowMatrix[i, i].Min, _rowMatrix[i, i].Max);
_rowMatrix[i, i].DesiredSize = _rowMatrix[i, i].OfferedSize;
}
}
}
if (emptyCols)
{
_colMatrix[0, 0] = new Segment(0, 0, double.PositiveInfinity, GridUnitType.Star);
_colMatrix[0, 0].Stars = 1.0;
totalStarsX += 1.0;
}
else
{
for (int i = 0; i < colCount; i++)
{
ColumnDefinition coldef = ColumnDefinitions[i];
GridLength width = coldef.Width;
coldef.ActualWidth = double.PositiveInfinity;
_colMatrix[i, i] = new Segment(0, coldef.MinWidth, coldef.MaxWidth, width.GridUnitType);
if (width.GridUnitType == GridUnitType.Pixel)
{
_colMatrix[i, i].OfferedSize = Clamp(width.Value, _colMatrix[i, i].Min, _colMatrix[i, i].Max);
_colMatrix[i, i].DesiredSize = _colMatrix[i, i].OfferedSize;
coldef.ActualWidth = _colMatrix[i, i].OfferedSize;
}
else if (width.GridUnitType == GridUnitType.Star)
{
_colMatrix[i, i].OfferedSize = Clamp(0, _colMatrix[i, i].Min, _colMatrix[i, i].Max);
_colMatrix[i, i].DesiredSize = _colMatrix[i, i].OfferedSize;
_colMatrix[i, i].Stars = width.Value;
totalStarsX += width.Value;
}
else if (width.GridUnitType == GridUnitType.Auto)
{
_colMatrix[i, i].OfferedSize = Clamp(0, _colMatrix[i, i].Min, _colMatrix[i, i].Max);
_colMatrix[i, i].DesiredSize = _colMatrix[i, i].OfferedSize;
}
}
}
List <GridNode> sizes = new List <GridNode>();
GridNode node;
GridNode separator = new GridNode(null, 0, 0, 0);
int separatorIndex;
sizes.Add(separator);
// Pre-process the grid children so that we know what types of elements we have so
// we can apply our special measuring rules.
GridWalker gridWalker = new GridWalker(this, _rowMatrix, _colMatrix);
for (int i = 0; i < 6; i++)
{
// These bools tell us which grid element type we should be measuring. i.e.
// 'star/auto' means we should measure elements with a star row and auto col
bool autoAuto = i == 0;
bool starAuto = i == 1;
bool autoStar = i == 2;
bool starAutoAgain = i == 3;
bool nonStar = i == 4;
bool remainingStar = i == 5;
if (hasChildren)
{
ExpandStarCols(totalSize);
ExpandStarRows(totalSize);
}
foreach (Control child in Children)
{
int col, row;
int colspan, rowspan;
double childSizeX = 0;
double childSizeY = 0;
bool starCol = false;
bool starRow = false;
bool autoCol = false;
bool autoRow = false;
col = Math.Min(GetColumn(child), colCount - 1);
row = Math.Min(GetRow(child), rowCount - 1);
colspan = Math.Min(GetColumnSpan(child), colCount - col);
rowspan = Math.Min(GetRowSpan(child), rowCount - row);
for (int r = row; r < row + rowspan; r++)
{
starRow |= _rowMatrix[r, r].Type == GridUnitType.Star;
autoRow |= _rowMatrix[r, r].Type == GridUnitType.Auto;
}
for (int c = col; c < col + colspan; c++)
{
starCol |= _colMatrix[c, c].Type == GridUnitType.Star;
autoCol |= _colMatrix[c, c].Type == GridUnitType.Auto;
}
// This series of if statements checks whether or not we should measure
// the current element and also if we need to override the sizes
// passed to the Measure call.
// If the element has Auto rows and Auto columns and does not span Star
// rows/cols it should only be measured in the auto_auto phase.
// There are similar rules governing auto/star and star/auto elements.
// NOTE: star/auto elements are measured twice. The first time with
// an override for height, the second time without it.
if (autoRow && autoCol && !starRow && !starCol)
{
if (!autoAuto)
{
continue;
}
childSizeX = double.PositiveInfinity;
childSizeY = double.PositiveInfinity;
}
else if (starRow && autoCol && !starCol)
{
if (!(starAuto || starAutoAgain))
{
continue;
}
if (starAuto && gridWalker.HasAutoStar)
{
childSizeY = double.PositiveInfinity;
}
childSizeX = double.PositiveInfinity;
}
else if (autoRow && starCol && !starRow)
{
if (!autoStar)
{
continue;
}
childSizeY = double.PositiveInfinity;
}
else if ((autoRow || autoCol) && !(starRow || starCol))
{
if (!nonStar)
{
continue;
}
if (autoRow)
{
childSizeY = double.PositiveInfinity;
}
if (autoCol)
{
childSizeX = double.PositiveInfinity;
}
}
else if (!(starRow || starCol))
{
if (!nonStar)
{
continue;
}
}
else
{
if (!remainingStar)
{
continue;
}
}
for (int r = row; r < row + rowspan; r++)
{
childSizeY += _rowMatrix[r, r].OfferedSize;
}
for (int c = col; c < col + colspan; c++)
{
childSizeX += _colMatrix[c, c].OfferedSize;
}
child.Measure(new Size(childSizeX, childSizeY));
Size desired = child.DesiredSize;
// Elements distribute their height based on two rules:
// 1) Elements with rowspan/colspan == 1 distribute their height first
// 2) Everything else distributes in a LIFO manner.
// As such, add all UIElements with rowspan/colspan == 1 after the separator in
// the list and everything else before it. Then to process, just keep popping
// elements off the end of the list.
if (!starAuto)
{
node = new GridNode(_rowMatrix, row + rowspan - 1, row, desired.Height);
separatorIndex = sizes.IndexOf(separator);
sizes.Insert(node.Row == node.Column ? separatorIndex + 1 : separatorIndex, node);
}
node = new GridNode(_colMatrix, col + colspan - 1, col, desired.Width);
separatorIndex = sizes.IndexOf(separator);
sizes.Insert(node.Row == node.Column ? separatorIndex + 1 : separatorIndex, node);
}
sizes.Remove(separator);
while (sizes.Count > 0)
{
node = sizes.Last();
node.Matrix[node.Row, node.Column].DesiredSize = Math.Max(node.Matrix[node.Row, node.Column].DesiredSize, node.Size);
AllocateDesiredSize(rowCount, colCount);
sizes.Remove(node);
}
sizes.Add(separator);
}
// Once we have measured and distributed all sizes, we have to store
// the results. Every time we want to expand the rows/cols, this will
// be used as the baseline.
SaveMeasureResults();
sizes.Remove(separator);
double gridSizeX = 0;
double gridSizeY = 0;
for (int c = 0; c < colCount; c++)
{
gridSizeX += _colMatrix[c, c].DesiredSize;
}
for (int r = 0; r < rowCount; r++)
{
gridSizeY += _rowMatrix[r, r].DesiredSize;
}
return(new Size(gridSizeX, gridSizeY));
}
/// <summary>
/// Measures the grid.
/// </summary>
/// <param name="constraint">The available size.</param>
/// <returns>The desired size of the control.</returns>
protected override Size MeasureOverride(Size constraint)
{
Size totalSize = constraint;
int colCount = ColumnDefinitions.Count;
int rowCount = RowDefinitions.Count;
double totalStarsX = 0;
double totalStarsY = 0;
bool emptyRows = rowCount == 0;
bool emptyCols = colCount == 0;
bool hasChildren = Children.Count > 0;
if (emptyRows)
{
rowCount = 1;
}
if (emptyCols)
{
colCount = 1;
}
CreateMatrices(rowCount, colCount);
if (emptyRows)
{
_rowMatrix[0, 0] = new Segment(0, 0, double.PositiveInfinity, GridUnitType.Star);
_rowMatrix[0, 0].Stars = 1.0;
totalStarsY += 1.0;
}
else
{
for (int i = 0; i < rowCount; i++)
{
RowDefinition rowdef = RowDefinitions[i];
GridLength height = rowdef.Height;
rowdef.ActualHeight = double.PositiveInfinity;
_rowMatrix[i, i] = new Segment(0, rowdef.MinHeight, rowdef.MaxHeight, height.GridUnitType);
if (height.GridUnitType == GridUnitType.Pixel)
{
_rowMatrix[i, i].OfferedSize = Clamp(height.Value, _rowMatrix[i, i].Min, _rowMatrix[i, i].Max);
_rowMatrix[i, i].DesiredSize = _rowMatrix[i, i].OfferedSize;
rowdef.ActualHeight = _rowMatrix[i, i].OfferedSize;
}
else if (height.GridUnitType == GridUnitType.Star)
{
_rowMatrix[i, i].Stars = height.Value;
totalStarsY += height.Value;
}
else if (height.GridUnitType == GridUnitType.Auto)
{
_rowMatrix[i, i].OfferedSize = Clamp(0, _rowMatrix[i, i].Min, _rowMatrix[i, i].Max);
_rowMatrix[i, i].DesiredSize = _rowMatrix[i, i].OfferedSize;
}
}
}
if (emptyCols)
{
_colMatrix[0, 0] = new Segment(0, 0, double.PositiveInfinity, GridUnitType.Star);
_colMatrix[0, 0].Stars = 1.0;
totalStarsX += 1.0;
}
else
{
for (int i = 0; i < colCount; i++)
{
ColumnDefinition coldef = ColumnDefinitions[i];
GridLength width = coldef.Width;
coldef.ActualWidth = double.PositiveInfinity;
_colMatrix[i, i] = new Segment(0, coldef.MinWidth, coldef.MaxWidth, width.GridUnitType);
if (width.GridUnitType == GridUnitType.Pixel)
{
_colMatrix[i, i].OfferedSize = Clamp(width.Value, _colMatrix[i, i].Min, _colMatrix[i, i].Max);
_colMatrix[i, i].DesiredSize = _colMatrix[i, i].OfferedSize;
coldef.ActualWidth = _colMatrix[i, i].OfferedSize;
}
else if (width.GridUnitType == GridUnitType.Star)
{
_colMatrix[i, i].Stars = width.Value;
totalStarsX += width.Value;
}
else if (width.GridUnitType == GridUnitType.Auto)
{
_colMatrix[i, i].OfferedSize = Clamp(0, _colMatrix[i, i].Min, _colMatrix[i, i].Max);
_colMatrix[i, i].DesiredSize = _colMatrix[i, i].OfferedSize;
}
}
}
List<GridNode> sizes = new List<GridNode>();
GridNode node;
GridNode separator = new GridNode(null, 0, 0, 0);
int separatorIndex;
sizes.Add(separator);
// Pre-process the grid children so that we know what types of elements we have so
// we can apply our special measuring rules.
GridWalker gridWalker = new GridWalker(this, _rowMatrix, _colMatrix);
for (int i = 0; i < 6; i++)
{
// These bools tell us which grid element type we should be measuring. i.e.
// 'star/auto' means we should measure elements with a star row and auto col
bool autoAuto = i == 0;
bool starAuto = i == 1;
bool autoStar = i == 2;
bool starAutoAgain = i == 3;
bool nonStar = i == 4;
bool remainingStar = i == 5;
if (hasChildren)
{
ExpandStarCols(totalSize);
ExpandStarRows(totalSize);
}
foreach (Control child in Children)
{
int col, row;
int colspan, rowspan;
double childSizeX = 0;
double childSizeY = 0;
bool starCol = false;
bool starRow = false;
bool autoCol = false;
bool autoRow = false;
col = Math.Min(GetColumn(child), colCount - 1);
row = Math.Min(GetRow(child), rowCount - 1);
colspan = Math.Min(GetColumnSpan(child), colCount - col);
rowspan = Math.Min(GetRowSpan(child), rowCount - row);
for (int r = row; r < row + rowspan; r++)
{
starRow |= _rowMatrix[r, r].Type == GridUnitType.Star;
autoRow |= _rowMatrix[r, r].Type == GridUnitType.Auto;
}
for (int c = col; c < col + colspan; c++)
{
starCol |= _colMatrix[c, c].Type == GridUnitType.Star;
autoCol |= _colMatrix[c, c].Type == GridUnitType.Auto;
}
// This series of if statements checks whether or not we should measure
// the current element and also if we need to override the sizes
// passed to the Measure call.
// If the element has Auto rows and Auto columns and does not span Star
// rows/cols it should only be measured in the auto_auto phase.
// There are similar rules governing auto/star and star/auto elements.
// NOTE: star/auto elements are measured twice. The first time with
// an override for height, the second time without it.
if (autoRow && autoCol && !starRow && !starCol)
{
if (!autoAuto)
{
continue;
}
childSizeX = double.PositiveInfinity;
childSizeY = double.PositiveInfinity;
}
else if (starRow && autoCol && !starCol)
{
if (!(starAuto || starAutoAgain))
{
continue;
}
if (starAuto && gridWalker.HasAutoStar)
{
childSizeY = double.PositiveInfinity;
}
childSizeX = double.PositiveInfinity;
}
else if (autoRow && starCol && !starRow)
{
if (!autoStar)
{
continue;
}
childSizeY = double.PositiveInfinity;
}
else if ((autoRow || autoCol) && !(starRow || starCol))
{
if (!nonStar)
{
continue;
}
if (autoRow)
{
childSizeY = double.PositiveInfinity;
}
if (autoCol)
{
childSizeX = double.PositiveInfinity;
}
}
else if (!(starRow || starCol))
{
if (!nonStar)
{
continue;
}
}
else
{
if (!remainingStar)
{
continue;
}
}
for (int r = row; r < row + rowspan; r++)
{
childSizeY += _rowMatrix[r, r].OfferedSize;
}
for (int c = col; c < col + colspan; c++)
{
childSizeX += _colMatrix[c, c].OfferedSize;
}
child.Measure(new Size(childSizeX, childSizeY));
Size desired = child.DesiredSize;
// Elements distribute their height based on two rules:
// 1) Elements with rowspan/colspan == 1 distribute their height first
// 2) Everything else distributes in a LIFO manner.
// As such, add all UIElements with rowspan/colspan == 1 after the separator in
// the list and everything else before it. Then to process, just keep popping
// elements off the end of the list.
if (!starAuto)
{
node = new GridNode(_rowMatrix, row + rowspan - 1, row, desired.Height);
separatorIndex = sizes.IndexOf(separator);
sizes.Insert(node.Row == node.Column ? separatorIndex + 1 : separatorIndex, node);
}
node = new GridNode(_colMatrix, col + colspan - 1, col, desired.Width);
separatorIndex = sizes.IndexOf(separator);
sizes.Insert(node.Row == node.Column ? separatorIndex + 1 : separatorIndex, node);
}
sizes.Remove(separator);
while (sizes.Count > 0)
{
node = sizes.Last();
node.Matrix[node.Row, node.Column].DesiredSize = Math.Max(node.Matrix[node.Row, node.Column].DesiredSize, node.Size);
AllocateDesiredSize(rowCount, colCount);
sizes.Remove(node);
}
sizes.Add(separator);
}
// Once we have measured and distributed all sizes, we have to store
// the results. Every time we want to expand the rows/cols, this will
// be used as the baseline.
SaveMeasureResults();
sizes.Remove(separator);
double gridSizeX = 0;
double gridSizeY = 0;
for (int c = 0; c < colCount; c++)
{
gridSizeX += _colMatrix[c, c].DesiredSize;
}
for (int r = 0; r < rowCount; r++)
{
gridSizeY += _rowMatrix[r, r].DesiredSize;
}
return new Size(gridSizeX, gridSizeY);
}
