List <CellPos> GetCells(CGSize cellSize)
{
int nexpands = 0;
double requiredSize = 0;
double availableSize = cellSize.Width;
var cellFrames = new List <CellPos> (cells.Count);
// Get the natural size of each child
foreach (var cell in cells)
{
if (!cell.Backend.Frontend.Visible)
{
continue;
}
var cellPos = new CellPos {
Cell = (NSView)cell, Frame = CGRect.Empty
};
cellFrames.Add(cellPos);
var size = cellPos.Cell.FittingSize;
cellPos.Frame.Width = size.Width;
requiredSize += size.Width;
if (cell.Backend.Frontend.Expands)
{
nexpands++;
}
}
double remaining = availableSize - requiredSize;
if (remaining > 0)
{
var expandRemaining = new SizeSplitter(remaining, nexpands);
foreach (var cellFrame in cellFrames)
{
if (((ICellRenderer)cellFrame.Cell).Backend.Frontend.Expands)
{
cellFrame.Frame.Width += (nfloat)expandRemaining.NextSizePart();
}
}
}
double x = 0;
foreach (var cellFrame in cellFrames)
{
var width = cellFrame.Frame.Width;
var canvas = cellFrame.Cell as ICanvasCellRenderer;
var height = (canvas != null) ? canvas.GetRequiredSize(SizeConstraint.WithSize(width)).Height : cellFrame.Cell.FittingSize.Height;
// y-align only if the cell has a valid height, otherwise we're just recalculating the required size
var y = cellSize.Height > 0 ? (cellSize.Height - height) / 2 : 0;
cellFrame.Frame = new CGRect(x, y, width, height);
x += width;
}
return(cellFrames);
}
IEnumerable <CellPos> GetCells(CGRect cellFrame)
{
int nexpands = 0;
double requiredSize = 0;
double availableSize = cellFrame.Width;
var visibleCells = VisibleCells.ToArray();
var sizes = new double [visibleCells.Length];
// Get the natural size of each child
for (int i = 0; i < visibleCells.Length; i++)
{
var v = visibleCells[i] as NSView;
var s = v.FittingSize;
if (s.IsEmpty && SizeToFit(v))
{
s = v.Frame.Size;
}
sizes [i] = s.Width;
requiredSize += s.Width;
if (visibleCells [i].Backend.Frontend.Expands)
{
nexpands++;
}
}
double remaining = availableSize - requiredSize;
if (remaining > 0)
{
var expandRemaining = new SizeSplitter(remaining, nexpands);
for (int i = 0; i < visibleCells.Length; i++)
{
if (visibleCells [i].Backend.Frontend.Expands)
{
sizes [i] += (nfloat)expandRemaining.NextSizePart();
}
}
}
double x = cellFrame.X;
for (int i = 0; i < visibleCells.Length; i++)
{
var cell = (NSView)visibleCells [i];
var height = cell.FittingSize.Height;
var y = (cellFrame.Height - height) / 2;
yield return(new CellPos {
Cell = cell, Frame = new CGRect(x, y, sizes [i], height)
});
x += sizes [i];
}
}
/// <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.GetAlignmentForOrientation (orientation);
if (!double.IsNaN (al)) {
double s = sizes[n];
if (s < allocatedSize) {
cellOffset = (allocatedSize - s) * al;
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;
}
}
}
IEnumerable <CellPos> GetCells(CGRect cellFrame)
{
if (direction == Orientation.Horizontal)
{
int nexpands = 0;
double requiredSize = 0;
double availableSize = cellFrame.Width;
var sizes = new Dictionary <ICellRenderer, double> ();
// Get the natural size of each child
foreach (var bp in VisibleCells)
{
var s = ((NSCell)bp).CellSize;
sizes [bp] = s.Width;
requiredSize += s.Width;
if (bp.Backend.Frontend.Expands)
{
nexpands++;
}
}
double remaining = availableSize - requiredSize;
if (remaining > 0)
{
var expandRemaining = new SizeSplitter(remaining, nexpands);
foreach (var bp in VisibleCells)
{
if (bp.Backend.Frontend.Expands)
{
sizes [bp] += (nfloat)expandRemaining.NextSizePart();
}
}
}
double x = cellFrame.X;
foreach (var s in sizes)
{
yield return(new CellPos()
{
Cell = (NSCell)s.Key, Frame = new CGRect(x, cellFrame.Y, s.Value, cellFrame.Height)
});
x += s.Value;
}
}
else
{
nfloat y = cellFrame.Y;
foreach (NSCell c in VisibleCells)
{
var s = c.CellSize;
var f = new CGRect(cellFrame.X, y, s.Width, cellFrame.Height);
y += s.Height;
yield return(new CellPos()
{
Cell = c, Frame = f
});
}
}
}