protected override Size MeasureOverride(Size availableSize)
{
availableSize = EnsureMinMaxWidthHeight(availableSize);
foreach (var item in Children)
{
item.Measure(availableSize);
}
var rows = this.RowDefinitions as IList <ISizeDefinition>;
var columns = this.ColumnDefinitions as IList <ISizeDefinition>;
if (rows.Count == 0)
{
rows = new ISizeDefinition[] { new RelativSizeDefinition()
{
Size = 1
} }
}
;
if (columns.Count == 0)
{
columns = new ISizeDefinition[] { new RelativSizeDefinition()
{
Size = 1
} }
}
;
int[] columnWidth = new int[columns.Count];
int[] rowHeight = new int[rows.Count];
// calculate singelspan items.
for (int i = 0; i < columnWidth.Length; i++)
{
if (columns[i] is FixSizeDefinition f)
{
columnWidth[i] = f.Size;
}
else
{
var singelSpanElements = Children
.Where(x => Grid.ColumnSpan[x].Value == 1 && Grid.Column[x].Value == i);
columnWidth[i] = (int)(singelSpanElements.Any() ? singelSpanElements.Max(x => x.MarginAndDesiredSize.Width) : 0);
}
}
for (int i = 0; i < rowHeight.Length; i++)
{
if (rows[i] is FixSizeDefinition f)
{
rowHeight[i] = f.Size;
}
else
{
var singelSpanElements = Children
.Where(x => Grid.RowSpan[x].Value == 1 && Grid.Row[x].Value == i);
rowHeight[i] = (int)(singelSpanElements.Any() ? singelSpanElements.Max(x => x.MarginAndDesiredSize.Height) : 0);
}
}
// calculate multispan items
foreach (var item in Children)
{
var row = Grid.Row[item].Value;
var column = Grid.Column[item].Value;
var rowSpan = Grid.RowSpan[item].Value;
var columnSpan = Grid.ColumnSpan[item].Value;
if (rowSpan == 1 && columnSpan == 1)
{
continue; // Nothing to do here. First step should be enough
}
var xFrom = Math.Min(columns.Count - 1, column);
var xTo = Math.Min(columns.Count - 1, column + columnSpan);
var yFrom = Math.Min(rows.Count - 1, row);
var yTo = Math.Min(rows.Count - 1, row + rowSpan);
var usedWidth = columnWidth.Skip(xFrom).Take(columnSpan).Sum();
var usedHeight = rowHeight.Skip(yFrom).Take(rowSpan).Sum();
if (usedWidth > item.MarginAndDesiredSize.Width && columnSpan != 1) // we need more space from relativ Size Elements
{
var totalRelativSizeColumns = columns.Skip(xFrom).Take(columnSpan).OfType <RelativSizeDefinition>().Sum(x => x.Size);
if (totalRelativSizeColumns > 0)
{
var missingWidth = item.MarginAndDesiredSize.Width - usedWidth;
for (int x = xFrom; x < xTo; x++)
{
if (columns[x] is RelativSizeDefinition r)
{
columnWidth[x] += (int)Math.Ceiling(missingWidth * r.Size / totalRelativSizeColumns);
}
}
}
}
if (usedHeight > item.MarginAndDesiredSize.Height && rowSpan != 1) // we need more space from relativ Size Elements
{
var totalRelativSizeColumns = rows.Skip(yFrom).Take(rowSpan).OfType <RelativSizeDefinition>().Sum(x => x.Size);
if (totalRelativSizeColumns > 0)
{
var missingHeight = item.MarginAndDesiredSize.Height - usedHeight;
for (int y = yFrom; y < yTo; y++)
{
if (rows[y] is RelativSizeDefinition r)
{
rowHeight[y] += (int)Math.Ceiling(missingHeight * r.Size / totalRelativSizeColumns);
}
}
}
}
}
// Ensure ratio between colums and rows
var relativeWidthRatio = columns.Zip(columnWidth, (c, w) =>
{
if (c is RelativSizeDefinition r)
{
return(r.Size != 0.0 ? w / r.Size : 0.0);
}
return(0.0);
}).Max();
var relativeHeightRatio = rows.Zip(rowHeight, (c, h) =>
{
if (c is RelativSizeDefinition r)
{
return(r.Size != 0.0 ? h / r.Size : 0);
}
return(0.0);
}).Max();
for (int i = 0; i < columns.Count; i++)
{
if (columns[i] is RelativSizeDefinition r)
{
columnWidth[i] = (int)Math.Round(r.Size * relativeWidthRatio);
}
}
for (int i = 0; i < rows.Count; i++)
{
if (rows[i] is RelativSizeDefinition r)
{
rowHeight[i] = (int)Math.Round(r.Size * relativeHeightRatio);
}
}
// Ensure min max on columns and rows
for (int i = 0; i < columns.Count; i++)
{
if (columns[i].Min.HasValue)
{
columnWidth[i] = Math.Max(columns[i].Min.Value, columnWidth[i]);
}
if (columns[i].Max.HasValue)
{
columnWidth[i] = Math.Min(columns[i].Max.Value, columnWidth[i]);
}
}
for (int i = 0; i < rows.Count; i++)
{
if (rows[i].Min.HasValue)
{
rowHeight[i] = Math.Max(rows[i].Min.Value, rowHeight[i]);
}
if (rows[i].Max.HasValue)
{
rowHeight[i] = Math.Min(rows[i].Max.Value, rowHeight[i]);
}
}
return(new Size(columnWidth.Sum(), rowHeight.Sum()));
}
protected override void ArrangeOverride(Size finalSize)
{
//base.ArrangeOverride(finalSize);
var rows = this.RowDefinitions as IList <ISizeDefinition>;
var columns = this.ColumnDefinitions as IList <ISizeDefinition>;
if (rows.Count == 0)
{
rows = new ISizeDefinition[] { new RelativSizeDefinition()
{
Size = 1
} }
}
;
if (columns.Count == 0)
{
columns = new ISizeDefinition[] { new RelativSizeDefinition()
{
Size = 1
} }
}
;
int[] columnWidth = new int[columns.Count];
int[] rowHeight = new int[rows.Count];
var availableWidth = finalSize.Width;
for (int i = 0; i < columnWidth.Length; i++)
{
if (columns[i] is FixSizeDefinition f)
{
if (availableWidth > f.Size)
{
columnWidth[i] = f.Size;
availableWidth -= f.Size;
}
else
{
columnWidth[i] = (int)availableWidth;
availableWidth = 0;
}
}
}
for (int i = 0; i < columnWidth.Length; i++)
{
if (columns[i] is AutoSizeDefinition a)
{
var viableElements = Children.Where(x => Column[x].Value == i && ColumnSpan[x].Value == 1);
var desiredWidth = viableElements.Any() ? viableElements.Max(x => x.MarginAndDesiredSize.Width) : 0;
if (availableWidth > desiredWidth)
{
columnWidth[i] = (int)desiredWidth;
availableWidth -= desiredWidth;
}
else
{
columnWidth[i] = (int)availableWidth;
availableWidth = 0;
}
}
}
var totalRelativeSize = columns.OfType <RelativSizeDefinition>().Sum(x => x.Size);
if (totalRelativeSize > 0)
{
var widthRatio = availableWidth / totalRelativeSize;
for (int i = 0; i < columnWidth.Length; i++)
{
if (columns[i] is RelativSizeDefinition r)
{
var desiredWidth = (int)Math.Ceiling(r.Size * widthRatio);
if (availableWidth > desiredWidth)
{
columnWidth[i] = desiredWidth;
availableWidth -= desiredWidth;
}
else
{
columnWidth[i] = (int)availableWidth;
availableWidth = 0;
}
}
}
}
/////////////////
var availableHeight = finalSize.Height;
for (int i = 0; i < rowHeight.Length; i++)
{
if (rows[i] is FixSizeDefinition f)
{
if (availableHeight > f.Size)
{
rowHeight[i] = f.Size;
availableHeight -= f.Size;
}
else
{
rowHeight[i] = (int)availableHeight;
availableHeight = 0;
}
}
}
for (int i = 0; i < rowHeight.Length; i++)
{
if (rows[i] is AutoSizeDefinition a)
{
var validElements = Children.Where(x => Row[x].Value == i && RowSpan[x].Value == 1);
var desiredHeight = validElements.Any() ? validElements.Max(x => x.MarginAndDesiredSize.Height) : 0;
if (availableHeight > desiredHeight)
{
rowHeight[i] = (int)desiredHeight;
availableHeight -= desiredHeight;
}
else
{
rowHeight[i] = (int)availableHeight;
availableHeight = 0;
}
}
}
totalRelativeSize = rows.OfType <RelativSizeDefinition>().Sum(x => x.Size);
if (totalRelativeSize > 0)
{
var heightRatio = availableHeight / totalRelativeSize;
for (int i = 0; i < rowHeight.Length; i++)
{
if (rows[i] is RelativSizeDefinition r)
{
var desiredheight = (int)Math.Ceiling(r.Size * heightRatio);
if (availableHeight > desiredheight)
{
rowHeight[i] = desiredheight;
availableHeight -= desiredheight;
}
else
{
rowHeight[i] = (int)availableHeight;
availableHeight = 0;
}
}
}
}
///////////////////////////
foreach (var item in Children)
{
var row = Grid.Row[item].Value;
var column = Grid.Column[item].Value;
var rowSpan = Grid.RowSpan[item].Value;
var columnSpan = Grid.ColumnSpan[item].Value;
var xFrom = Math.Min(columns.Count - 1, column);
var xTo = Math.Min(columns.Count, column + columnSpan);
var yFrom = Math.Min(rows.Count - 1, row);
var yTo = Math.Min(rows.Count, row + rowSpan);
int width = 0;
int height = 0;
for (int i = xFrom; i < xTo; i++)
{
width += columnWidth[i];
}
for (int i = yFrom; i < yTo; i++)
{
height += rowHeight[i];
}
int x = 0;
int y = 0;
for (int i = 0; i < xFrom; i++)
{
x += columnWidth[i];
}
for (int i = 0; i < yFrom; i++)
{
y += rowHeight[i];
}
if (item.MarginAndDesiredSize.Width < width)
{
int diff = width - (int)item.MarginAndDesiredSize.Width;
switch (item.HorizontalAlignment)
{
case HorizontalAlignment.Left:
width -= diff;
break;
case HorizontalAlignment.Right:
x += diff;
break;
case HorizontalAlignment.Center:
x += (int)Math.Floor(diff / 2.0);
width -= (int)Math.Ceiling(diff / 2.0);
break;
case HorizontalAlignment.Strech:
default:
break;
}
}
if (item.MarginAndDesiredSize.Height < height)
{
int diff = height - (int)item.MarginAndDesiredSize.Height;
switch (item.VerticalAlignment)
{
case VerticalAlignment.Top:
height -= diff;
break;
case VerticalAlignment.Bottom:
y += diff;
break;
case VerticalAlignment.Center:
y += (int)Math.Floor(diff / 2.0);
height -= (int)Math.Ceiling(diff / 2.0);
break;
case VerticalAlignment.Strech:
default:
break;
}
}
if (height > item.DesiredSize.Height)
{
y += item.Margin.Top;
height -= (item.Margin.Bottom + item.Margin.Top);
}
if (width > item.DesiredSize.Width)
{
x += item.Margin.Left;
width -= (item.Margin.Left + item.Margin.Right);
}
width = Math.Max(0, width);
height = Math.Max(0, height);
item.Arrange(new Rect(x, y, width, height));
}
}