protected override void LayoutChildren(double x, double y, double width, double height)
{
LayoutData layoutData = GetLayoutData(width, height);
if (layoutData.VisibleChildCount == 0)
{
return;
}
double xChild = x;
double yChild = y;
int row = 0;
int column = 0;
foreach (View child in Children)
{
if (!child.IsVisible)
{
continue;
}
LayoutChildIntoBoundingRegion(child, new Rectangle(new Point(xChild, yChild), layoutData.CellSize));
if (++column == layoutData.Columns)
{
column = 0;
row++;
xChild = x;
yChild += RowSpacing + layoutData.CellSize.Height;
}
else
{
xChild += ColumnSpacing + layoutData.CellSize.Width;
}
}
}
LayoutData GetLayoutData(double width, double height)
{
Size size = new Size(width, height);
// Check if cached information is available.
if (layoutDataCache.ContainsKey(size))
{
return(layoutDataCache[size]);
}
int visibleChildCount = 0;
Size maxChildSize = new Size();
int rows = 0;
int columns = 0;
LayoutData layoutData = new LayoutData();
// Enumerate through all the children.
foreach (View child in Children)
{
// Skip invisible children.
if (!child.IsVisible)
{
continue;
}
// Count the visible children.
visibleChildCount++;
// Get the child's requested size.
SizeRequest childSizeRequest = child.Measure(Double.PositiveInfinity, Double.PositiveInfinity);
// Accumulate the maximum child size.
maxChildSize.Width = Math.Max(maxChildSize.Width, childSizeRequest.Request.Width);
maxChildSize.Height = Math.Max(maxChildSize.Height, childSizeRequest.Request.Height);
}
if (visibleChildCount != 0)
{
// Calculate the number of rows and columns.
if (Double.IsPositiveInfinity(width))
{
columns = visibleChildCount;
rows = 1;
}
else
{
columns = (int)((width + ColumnSpacing) / (maxChildSize.Width + ColumnSpacing));
columns = Math.Max(1, columns);
rows = (visibleChildCount + columns - 1) / columns;
}
// Now maximize the cell size based on the layout size.
Size cellSize = new Size();
if (Double.IsPositiveInfinity(width))
{
cellSize.Width = maxChildSize.Width;
}
else
{
cellSize.Width = (width - ColumnSpacing * (columns - 1)) / columns;
}
if (Double.IsPositiveInfinity(height))
{
cellSize.Height = maxChildSize.Height;
}
else
{
cellSize.Height = (height - RowSpacing * (rows - 1)) / rows;
}
layoutData = new LayoutData(visibleChildCount, cellSize, rows, columns);
}
layoutDataCache.Add(size, layoutData);
return(layoutData);
}
protected override void LayoutChildren(double x, double y, double width, double height)
{
LayoutData layoutData = GetLayoutData(width, height);
if (layoutData.VisibleChildCount == 0)
{
return;
}
double halfWidth = HexagonWidth / 2;
double quarterWidth = halfWidth / 2;
double halfHeight = HexagonHeight / 2;
double quarterHeight = halfHeight / 2;
double xChild = x;
double yChild = y;
if (PointyTop)
{
//Start off with first element placed at 0.5w-1.5w x 0.5h-1.5h
xChild += halfWidth + ColumnSpacing / 2;
if (OriginTopLeft)
{
yChild += halfHeight;
}
else
{
if (IsMenu)
{
xChild = x; //shift menu to far bottom-left corner
yChild = height - halfHeight;
}
else
{
yChild = height - HexagonHeight;
}
}
}
else
{
//Start off with first element placed at 0.75w-1.75w x 0h-1h
xChild += halfWidth + quarterWidth;
}
int row = 0;
int column = 0;
bool even = true;
foreach (View child in Children)
{
if (!child.IsVisible)
{
continue;
}
LayoutChildIntoBoundingRegion(child, new Rectangle(new Point(xChild, yChild), layoutData.CellSize));
if (PointyTop)
{
if (++column == layoutData.Columns)
{
column = 0;
row++;
even = row % 2 == 0;
if (even)
{
//Shift even rows to the right by .5
xChild = x + halfWidth + ColumnSpacing / 2;
}
else
{
xChild = x;
}
if (OriginTopLeft)
{
yChild += RowSpacing + layoutData.CellSize.Height - quarterHeight;
}
else
{
yChild -= (RowSpacing + layoutData.CellSize.Height - quarterHeight);
}
}
else
{
xChild += ColumnSpacing + layoutData.CellSize.Width;
}
}
else
{
//flat-top
if (++column == layoutData.Columns)
{
column = 0;
row++;
xChild = x + halfWidth + quarterWidth;
if (OriginTopLeft)
{
yChild += RowSpacing + layoutData.CellSize.Height;
}
else
{
yChild -= RowSpacing + layoutData.CellSize.Height;
}
}
else
{
xChild += ColumnSpacing + layoutData.CellSize.Width - quarterWidth;
even = column % 2 == 0;
if (even)
{
//if added .5h, remove it for even columns to shift back down
if (column > 0)
{
if (OriginTopLeft)
{
yChild -= halfHeight;
}
else
{
yChild += halfHeight;
}
}
}
else
{
//shift odd-columns up by .5h
if (OriginTopLeft)
{
yChild += halfHeight;
}
else
{
yChild -= halfHeight;
}
}
}
}
}
}
private LayoutData GetLayoutData(double width, double height)
{
Size size = new Size(width, height);
// Check if cached information is available.
if (layoutDataCache.ContainsKey(size))
{
return(layoutDataCache[size]);
}
int visibleChildCount = 0;
Size maxChildSize = new Size();
int rows = 0;
int columns = 0;
LayoutData layoutData = new LayoutData();
/*
* //Enumerate through all the children.
* foreach (View child in Children)
* {
* // Skip invisible children.
* if (!child.IsVisible)
* continue;
*
* // Count the visible children.
* visibleChildCount++;
*
* // Get the child's requested size.
* SizeRequest childSizeRequest = child.Measure(Double.PositiveInfinity, Double.PositiveInfinity);
*
* // Accumulate the maximum child size.
* maxChildSize.Width = Math.Max(maxChildSize.Width, childSizeRequest.Request.Width);
* maxChildSize.Height = Math.Max(maxChildSize.Height, childSizeRequest.Request.Height);
* }
*/
// For now force children into a size determined by Radius property
maxChildSize.Width = HexagonWidth;
maxChildSize.Height = HexagonHeight;
visibleChildCount = Children.Where(c => c.IsVisible).Count();
if (visibleChildCount != 0)
{
// Calculate the number of rows and columns.
if (Double.IsPositiveInfinity(width) ||
IsMenu)
{
columns = visibleChildCount;
rows = 1;
}
else
{
//columns = (int)((width + ColumnSpacing) / (maxChildSize.Width + ColumnSpacing));
columns = (int)((width - (maxChildSize.Width / 2)) / (maxChildSize.Width + ColumnSpacing));
columns = Math.Max(1, columns);
rows = (visibleChildCount + columns - 1) / columns;
}
/*
* // Now maximize the cell size based on the layout size.
* Size cellSize = new Size();
*
* if (Double.IsPositiveInfinity(width))
* cellSize.Width = maxChildSize.Width;
* else
* cellSize.Width = (width - ColumnSpacing * (columns - 1)) / columns;
*
* if (Double.IsPositiveInfinity(height))
* cellSize.Height = maxChildSize.Height;
* else
* cellSize.Height = (height - RowSpacing * (rows - 1)) / rows;
*/
// Keep the cells pre-defined size based off of radius
Size cellSize = new Size(HexagonWidth,
HexagonHeight);
layoutData = new LayoutData(visibleChildCount, cellSize, rows, columns);
}
layoutDataCache.Add(size, layoutData);
return(layoutData);
}