/// <summary>
/// Gets the constraints from the given placement or an automatic constraints in case
/// the placement has not table constraints.
/// </summary>
/// <param name="placement"></param>
/// <param name="lastConstraints"></param>
/// <returns></returns>
private TableLayoutConstraints GetConstrains(VCItemPlacement placement, TableLayoutConstraints lastConstraints)
{
TableLayoutConstraints constraints = placement.Constraints as TableLayoutConstraints;
if (constraints != null)
{
return(constraints);
}
// Auto generate constraints
if (lastConstraints == null)
{
return(new TableLayoutConstraints(0, 0));
}
else
{
int col = lastConstraints.ColumnIndex + lastConstraints.ColumnSpan;
// Next col ok?
if (col < colFills.Length)
{
return(new TableLayoutConstraints(col, lastConstraints.RowIndex));
}
// Next row ok?
int row = lastConstraints.RowIndex + lastConstraints.RowSpan;
if (row < rowsFills.Length)
{
return(new TableLayoutConstraints(0, row));
}
// Overflow, restart
return(new TableLayoutConstraints(0, 0));
}
}
/// <summary>
/// Set the locations of the given placements.
/// </summary>
/// <param name="placements">All placements that must be layed out.</param>
/// <param name="controlSize">The size of the control (in virtual units)</param>
public virtual void Layout(ICollection <VCItemPlacement> placements, SizeF controlSize)
{
if (placements.Count > 0)
{
// Calculate maximum width and total height
int[] maxColWidth = new int[colFills.Length];
int[] maxRowHeight = new int[rowsFills.Length];
TableLayoutConstraints lastConstraints = null;
foreach (VCItemPlacement placement in placements)
{
TableLayoutConstraints constraints = GetConstrains(placement, lastConstraints);
lastConstraints = constraints;
Size itemSz = placement.Item.PreferredSize + constraints.CellPadding.Size;
DistributeSize(itemSz.Width, constraints.ColumnIndex, constraints.ColumnSpan, colFills, maxColWidth);
DistributeSize(itemSz.Height, constraints.RowIndex, constraints.RowSpan, rowsFills, maxRowHeight);
}
// Calculate preferred size
this.preferredSize = this.size = new Size(MathUtil.Sum(maxColWidth) + padding.Horizontal, MathUtil.Sum(maxRowHeight) + padding.Vertical);
// Calculate full size (expand applicable columns and rows)
if (size.Width < controlSize.Width)
{
float extra = controlSize.Width - size.Width;
for (int i = 0; i < maxColWidth.Length; i++)
{
maxColWidth[i] += (int)(colFills[i] * extra);
}
}
if (size.Height < controlSize.Height)
{
float extra = controlSize.Height - size.Height;
for (int i = 0; i < maxRowHeight.Length; i++)
{
maxRowHeight[i] += (int)(rowsFills[i] * extra);
}
}
this.size = new Size(MathUtil.Sum(maxColWidth) + padding.Horizontal, MathUtil.Sum(maxRowHeight) + padding.Vertical);
// Calculate distance for dealing with table alignment (not cell alignment!)
int dx = padding.Left;
switch (hAlignment)
{
case HorizontalAlignment.Center:
dx += (controlSize.Width > size.Width) ? (int)((controlSize.Width - size.Width) / 2) : 0;
break;
case HorizontalAlignment.Right:
dx += (controlSize.Width > size.Width) ? (int)(controlSize.Width - size.Width) : 0;
break;
}
int dy = padding.Top;
switch (vAlignment)
{
case VerticalAlignment.Middle:
dy += (controlSize.Height > size.Height) ? (int)((controlSize.Height - size.Height) / 2) : 0;
break;
case VerticalAlignment.Bottom:
dy += (controlSize.Height > size.Height) ? (int)(controlSize.Height - size.Height) : 0;
break;
}
// Calculate item bounds
lastConstraints = null;
foreach (VCItemPlacement placement in placements)
{
TableLayoutConstraints constraints = GetConstrains(placement, lastConstraints);
lastConstraints = constraints;
Padding cellPadding = constraints.CellPadding;
Size maxItemSize = new Size(
MathUtil.Sum(maxColWidth, constraints.ColumnIndex, constraints.ColumnSpan) - cellPadding.Horizontal,
MathUtil.Sum(maxRowHeight, constraints.RowIndex, constraints.RowSpan) - cellPadding.Vertical);
Size itemSize = placement.Item.PreferredSize;
if ((constraints.Fill & FillDirection.Horizontal) != 0)
{
itemSize.Width = maxItemSize.Width;
}
if ((constraints.Fill & FillDirection.Vertical) != 0)
{
itemSize.Height = maxItemSize.Height;
}
int x = dx + MathUtil.Sum(maxColWidth, 0, constraints.ColumnIndex) + cellPadding.Left;
int y = dy + MathUtil.Sum(maxRowHeight, 0, constraints.RowIndex) + cellPadding.Top;
switch (constraints.ItemAlignment)
{
case ContentAlignment.TopCenter:
case ContentAlignment.MiddleCenter:
case ContentAlignment.BottomCenter:
x += (maxItemSize.Width - itemSize.Width) / 2;
break;
case ContentAlignment.TopRight:
case ContentAlignment.MiddleRight:
case ContentAlignment.BottomRight:
x += maxItemSize.Width - itemSize.Width;
break;
}
switch (constraints.ItemAlignment)
{
case ContentAlignment.MiddleLeft:
case ContentAlignment.MiddleCenter:
case ContentAlignment.MiddleRight:
y += (maxItemSize.Height - itemSize.Height) / 2;
break;
case ContentAlignment.BottomLeft:
case ContentAlignment.BottomCenter:
case ContentAlignment.BottomRight:
y += maxItemSize.Height - itemSize.Height;
break;
}
Rectangle bounds = new Rectangle(new Point(x, y), itemSize);
placement.Bounds = bounds;
}
}
else
{
this.preferredSize = Size.Empty;
this.size = Size.Empty;
}
}
