void CalcDefaultSizes(double width, double height)
{
bool vertical = direction == Orientation.Vertical;
int nexpands = 0;
double requiredSize = 0;
double availableSize = vertical ? height : width;
var widthConstraint = vertical ? SizeConstraint.WithSize(width) : SizeConstraint.Unconstrained;
var heightConstraint = vertical ? SizeConstraint.Unconstrained : SizeConstraint.WithSize(height);
var visibleChildren = children.Where(b => b.Child.Visible).ToArray();
var sizes = new Dictionary <BoxPlacement, double> ();
// Get the natural size of each child
foreach (var bp in visibleChildren)
{
Size s;
s = bp.Child.Surface.GetPreferredSize(widthConstraint, heightConstraint, true);
bp.NextSize = vertical ? s.Height : s.Width;
sizes [bp] = bp.NextSize;
requiredSize += bp.NextSize;
if (bp.Child.ExpandsForOrientation(direction))
{
nexpands++;
}
}
double remaining = availableSize - requiredSize - (spacing * (double)(visibleChildren.Length - 1));
if (remaining < 0)
{
// The box is not big enough to fit the widgets using its natural size.
// We have to shrink the widgets.
// The total amount we have to shrink
double shrinkSize = -remaining;
var sizePart = new SizeSplitter(shrinkSize, visibleChildren.Length);
foreach (var bp in visibleChildren)
{
bp.NextSize -= sizePart.NextSizePart();
}
}
else
{
var expandRemaining = new SizeSplitter(remaining, nexpands);
foreach (var bp in visibleChildren)
{
if (bp.Child.ExpandsForOrientation(direction))
{
bp.NextSize += expandRemaining.NextSizePart();
}
}
}
}
void CalcDefaultSizes(SizeRequestMode mode, double totalSize, double lengthConstraint)
{
bool calcHeights = direction == Orientation.Vertical;
bool useLengthConstraint = mode == SizeRequestMode.HeightForWidth && calcHeights || mode == SizeRequestMode.WidthForHeight && !calcHeights;
int nexpands = 0;
double naturalSize = 0;
var visibleChildren = children.Where(b => b.Child.Visible).ToArray();
var sizes = new Dictionary <BoxPlacement, WidgetSize> ();
// Get the natural size of each child
foreach (var bp in visibleChildren)
{
WidgetSize s;
if (useLengthConstraint)
{
s = GetPreferredLengthForSize(mode, bp.Child, lengthConstraint);
}
else
{
s = GetPreferredSize(calcHeights, bp.Child);
}
sizes [bp] = s;
naturalSize += s.NaturalSize;
bp.NextSize = s.NaturalSize;
if ((bp.BoxMode & BoxMode.Expand) != 0)
{
nexpands++;
}
}
double remaining = totalSize - naturalSize - (spacing * (double)(visibleChildren.Length - 1));
if (remaining < 0)
{
// The box is not big enough to fit the widgets using its natural size.
// We have to shrink the widgets.
// List of widgets that we have to shrink
var toShrink = new List <BoxPlacement> (visibleChildren);
// The total amount we have to shrink
double shrinkSize = -remaining;
while (toShrink.Count > 0 && shrinkSize > 0)
{
SizeSplitter sizePart = new SizeSplitter(shrinkSize, toShrink.Count);
shrinkSize = 0;
for (int i = 0; i < toShrink.Count; i++)
{
var bp = toShrink[i];
bp.NextSize -= sizePart.NextSizePart();
WidgetSize size = sizes [bp];
if (bp.NextSize < size.MinSize)
{
// If the widget can't be shrinked anymore, we remove it from the shrink list
// and increment the remaining shrink size. We'll loop again and this size will be
// substracted from the cells which can still be reduced
shrinkSize += (size.MinSize - bp.NextSize);
bp.NextSize = size.MinSize;
toShrink.RemoveAt(i);
i--;
}
}
}
}
else
{
var expandRemaining = new SizeSplitter(remaining, nexpands);
foreach (var bp in visibleChildren)
{
if ((bp.BoxMode & BoxMode.Expand) != 0)
{
bp.NextSize += expandRemaining.NextSizePart();
}
}
}
}
void CalcDefaultSizes(SizeRequestMode mode, double totalSize, double lengthConstraint)
{
bool calcHeights = direction == Orientation.Vertical;
bool useLengthConstraint = mode == SizeRequestMode.HeightForWidth && calcHeights || mode == SizeRequestMode.WidthForHeight && !calcHeights;
int nexpands = 0;
double naturalSize = 0;
var visibleChildren = children.Where(b => b.Child.Visible);
int childrenCount = 0;
// Get the natural size of each child
foreach (var bp in visibleChildren)
{
childrenCount++;
WidgetSize s;
if (useLengthConstraint)
{
s = GetPreferredLengthForSize(mode, bp.Child, lengthConstraint);
}
else
{
s = GetPreferredSize(calcHeights, bp.Child);
}
naturalSize += s.NaturalSize;
bp.NextSize = s.NaturalSize;
if ((bp.BoxMode & BoxMode.Expand) != 0)
{
nexpands++;
}
}
double remaining = totalSize - naturalSize - (spacing * (double)(childrenCount - 1));
if (remaining < 0)
{
// The box is not big enough to fit the widgets using its natural size.
// We have to shrink the widgets.
var sizePart = new SizeSplitter(-remaining, childrenCount);
var toAdjust = new List <BoxPlacement> ();
double adjustSize = 0;
foreach (var bp in visibleChildren)
{
WidgetSize s;
if (useLengthConstraint)
{
s = GetPreferredLengthForSize(mode, bp.Child, lengthConstraint);
}
else
{
s = GetPreferredSize(calcHeights, bp.Child);
}
bp.NextSize = s.NaturalSize - sizePart.NextSizePart();
if (bp.NextSize < s.MinSize)
{
adjustSize += (s.MinSize - bp.NextSize);
bp.NextSize = s.MinSize;
}
else
{
toAdjust.Add(bp);
}
}
sizePart = new SizeSplitter(adjustSize, toAdjust.Count);
foreach (var bp in toAdjust)
{
bp.NextSize += sizePart.NextSizePart();
}
}
else
{
var expandRemaining = new SizeSplitter(remaining, nexpands);
foreach (var bp in visibleChildren)
{
if ((bp.BoxMode & BoxMode.Expand) != 0)
{
bp.NextSize += expandRemaining.NextSizePart();
}
}
}
}
void CalcDefaultSizes(SizeRequestMode mode, double totalSize, bool calcHeights, bool calcOffsets)
{
TablePlacement[] visibleChildren;
Dictionary <int, WidgetSize> fixedSizesByCell;
HashSet <int> cellsWithExpand;
WidgetSize[] sizes;
double spacing;
CalcDefaultSizes(mode, calcHeights, out visibleChildren, out fixedSizesByCell, out cellsWithExpand, out sizes, out spacing);
double naturalSize = 0;
// Get the total natural size
foreach (var ws in fixedSizesByCell.Values)
{
naturalSize += ws.NaturalSize;
}
double remaining = totalSize - naturalSize - spacing;
if (remaining < 0)
{
// The box is not big enough to fit the widgets using its natural size.
// We have to shrink the cells
// List of cell indexes that we have to shrink
var toShrink = new List <int> (fixedSizesByCell.Keys);
// The total amount we have to shrink
double shrinkSize = -remaining;
while (toShrink.Count > 0 && shrinkSize > 0)
{
SizeSplitter sizePart = new SizeSplitter(shrinkSize, toShrink.Count);
shrinkSize = 0;
for (int i = 0; i < toShrink.Count; i++)
{
int n = toShrink[i];
double reduction = sizePart.NextSizePart();
WidgetSize size;
fixedSizesByCell.TryGetValue(n, out size);
size.NaturalSize -= reduction;
if (size.NaturalSize < size.MinSize)
{
// If the widget can't be shrinked anymore, we remove it from the shrink list
// and increment the remaining shrink size. We'll loop again and this size will be
// substracted from the cells which can still be reduced
shrinkSize += (size.MinSize - size.NaturalSize);
size.NaturalSize = size.MinSize;
toShrink.RemoveAt(i);
i--;
}
fixedSizesByCell [n] = size;
}
}
}
else
{
int nexpands = cellsWithExpand.Count;
var expandRemaining = new SizeSplitter(remaining, nexpands);
foreach (var c in cellsWithExpand)
{
WidgetSize ws;
fixedSizesByCell.TryGetValue(c, out ws);
ws.NaturalSize += expandRemaining.NextSizePart();
fixedSizesByCell [c] = ws;
}
}
for (int n = 0; n < visibleChildren.Length; n++)
{
var bp = visibleChildren[n];
double allocatedSize = 0;
double cellOffset = 0;
AttachOptions ops = calcHeights ? bp.YOptions : bp.XOptions;
int start = GetStartAttach(bp, calcHeights);
int end = GetEndAttach(bp, calcHeights);
for (int i = start; i < end; i++)
{
WidgetSize ws;
fixedSizesByCell.TryGetValue(i, out ws);
allocatedSize += ws.NaturalSize;
if (i != start)
{
allocatedSize += GetSpacing(i, calcHeights);
}
}
if ((ops & AttachOptions.Fill) == 0)
{
double s = sizes[n].NaturalSize;
if (s < allocatedSize)
{
cellOffset = (allocatedSize - s) / 2;
allocatedSize = s;
}
}
// cellOffset is the offset of the widget inside the cell. We store it in NextX/Y, and
// will be used below to calculate the total offset of the widget
if (calcHeights)
{
bp.NextHeight = allocatedSize;
bp.NextY = cellOffset;
}
else
{
bp.NextWidth = allocatedSize;
bp.NextX = cellOffset;
}
}
if (calcOffsets)
{
var sortedChildren = visibleChildren.OrderBy(c => GetStartAttach(c, calcHeights)).ToArray();
var cells = fixedSizesByCell.OrderBy(c => c.Key);
double offset = 0;
int n = 0;
foreach (var c in cells)
{
if (c.Key > 0)
{
offset += GetSpacing(c.Key, calcHeights);
}
while (n < sortedChildren.Length && GetStartAttach(sortedChildren[n], calcHeights) == c.Key)
{
// In the loop above we store the offset of the widget inside the cell in the NextX/Y field
// so now we have to add (not just assign) the offset of the cell to NextX/Y
if (calcHeights)
{
sortedChildren[n].NextY += offset;
}
else
{
sortedChildren[n].NextX += offset;
}
n++;
}
offset += c.Value.NaturalSize;
}
}
}
/// <summary>
/// Calculates size of each cell, taking into account their preferred size, expansion/fill requests, and the available space.
/// Calculation is done only for the provided orientation (either height or width).
/// </summary>
/// <param name="mode">Mode.</param>
/// <param name="availableSize">Total size available</param>
/// <param name="calcOffsets"></param>
void CalcCellSizes(CellSizeVector cellSizes, double availableSize, bool calcOffsets)
{
TablePlacement[] visibleChildren = cellSizes.visibleChildren;
Dictionary <int, double> fixedSizesByCell = cellSizes.fixedSizesByCell;
double[] sizes = cellSizes.sizes;
double spacing = cellSizes.spacing;
Orientation orientation = cellSizes.orientation;
// Get the total natural size
double naturalSize = fixedSizesByCell.Values.Sum();
double remaining = availableSize - naturalSize - spacing;
if (availableSize - spacing <= 0)
{
foreach (var i in fixedSizesByCell.Keys.ToArray())
{
fixedSizesByCell [i] = 0;
}
}
else if (remaining < 0)
{
// The box is not big enough to fit the widgets using its natural size.
// We have to shrink the cells. We do a proportional reduction
// List of cell indexes that we have to shrink
var toShrink = new List <int> (fixedSizesByCell.Keys);
// The total amount we have to shrink
double splitSize = (availableSize - spacing) / toShrink.Count;
// We have to reduce all cells proportionally, but if a cell is much bigger that
// its proportionally allocated space, then we reduce this one before the others
var smallCells = fixedSizesByCell.Where(c => c.Value < splitSize);
var belowSplitSize = smallCells.Sum(c => splitSize - c.Value);
var bigCells = fixedSizesByCell.Where(c => c.Value > splitSize);
var overSplitSize = bigCells.Sum(c => c.Value - splitSize);
ReduceProportional(fixedSizesByCell, bigCells.Select(c => c.Key), overSplitSize - belowSplitSize);
var newNatural = fixedSizesByCell.Sum(c => c.Value);
ReduceProportional(fixedSizesByCell, fixedSizesByCell.Keys, (availableSize - spacing) - newNatural);
RoundSizes(fixedSizesByCell);
}
else
{
// Distribute remaining space among the extensible widgets
HashSet <int> cellsWithExpand = cellSizes.cellsWithExpand;
int nexpands = cellsWithExpand.Count;
var expandRemaining = new SizeSplitter(remaining, nexpands);
foreach (var c in cellsWithExpand)
{
double ws;
fixedSizesByCell.TryGetValue(c, out ws);
ws += expandRemaining.NextSizePart();
fixedSizesByCell [c] = ws;
}
}
// Calculate the offset of each widget, relative to the cell (so 0 means at the left/top of the cell).
for (int n = 0; n < visibleChildren.Length; n++)
{
var bp = visibleChildren[n];
double allocatedSize = 0;
double cellOffset = 0;
int start = GetStartAttach(bp, orientation);
int end = GetEndAttach(bp, orientation);
for (int i = start; i < end; i++)
{
double ws;
fixedSizesByCell.TryGetValue(i, out ws);
allocatedSize += ws;
if (i != start)
{
allocatedSize += GetSpacing(i, orientation);
}
}
var al = bp.Child.AlignmentForOrientation(orientation);
if (al != WidgetPlacement.Fill)
{
double s = sizes[n];
if (s < allocatedSize)
{
cellOffset = (allocatedSize - s) * al.GetValue();
allocatedSize = s;
}
}
// cellOffset is the offset of the widget inside the cell. We store it in NextX/Y, and
// will be used below to calculate the total offset of the widget
if (orientation == Orientation.Vertical)
{
bp.NextHeight = allocatedSize;
bp.NextY = cellOffset;
}
else
{
bp.NextWidth = allocatedSize;
bp.NextX = cellOffset;
}
}
if (calcOffsets)
{
// Calculate the final offset of each widget, relative to the table origin
var sortedChildren = visibleChildren.OrderBy(c => GetStartAttach(c, orientation)).ToArray();
var cells = fixedSizesByCell.OrderBy(c => c.Key);
double offset = 0;
int n = 0;
foreach (var c in cells)
{
if (c.Key > 0)
{
offset += GetSpacing(c.Key, orientation);
}
while (n < sortedChildren.Length && GetStartAttach(sortedChildren[n], orientation) == c.Key)
{
// In the loop above we store the offset of the widget inside the cell in the NextX/Y field
// so now we have to add (not just assign) the offset of the cell to NextX/Y
if (orientation == Orientation.Vertical)
{
sortedChildren[n].NextY += offset;
}
else
{
sortedChildren[n].NextX += offset;
}
n++;
}
offset += c.Value;
}
}
}
