protected override void OnLayout(LayoutEventArgs e)
{
base.OnLayout(e);
var rect = ClientRectangle;
// calculate dimension
var dimension = Dimension;
if (Dimension.Width > Dimension.Height)
{
var minSize = (MinimumCellSize.Width + CellSpace.Width) * Dimension.Width + CellSize.Width;
if (rect.Height > rect.Width && Dimension.Width < minSize)
{
dimension = new Size(Dimension.Height, Dimension.Width);
}
}
else if (Dimension.Width < Dimension.Height)
{
var minSize = (MinimumCellSize.Height + CellSpace.Height) * Dimension.Height + CellSize.Height;
if (rect.Width > rect.Height && Dimension.Height < minSize)
{
dimension = new Size(Dimension.Height, Dimension.Width);
}
}
ActualDimension = dimension;
// calculate cell size
var cellSize = new Size(
(rect.Width - dimension.Width * CellSpace.Width) / dimension.Width,
(rect.Height - dimension.Height * CellSpace.Height) / dimension.Height);
cellSize.Width = Math.Min(CellSize.Width, Math.Max(MinimumCellSize.Width, cellSize.Width));
cellSize.Height = Math.Min(CellSize.Height, Math.Max(MinimumCellSize.Height, cellSize.Height));
ActualCellSize = cellSize;
// calculate start location
var startX = rect.X + (rect.Width - ((cellSize.Width + CellSpace.Width) * dimension.Width)) / 2;
var startY = rect.Y + (rect.Height - ((cellSize.Height + CellSpace.Height) * dimension.Height)) / 2;
startX = Math.Max(rect.X, startX) + CellSpace.Width / 2;
startY = Math.Max(rect.Y, startY) + CellSpace.Height / 2;
StartLocation = new Point(startX, startY);
// calculate cell bounds
int index = 0;
foreach (var item in DisplayItems)
{
int x = index % dimension.Width;
int y = index / dimension.Width;
var cellBounds = new Rectangle(
startX + x * (cellSize.Width + CellSpace.Width),
startY + y * (cellSize.Height + CellSpace.Height),
cellSize.Width,
cellSize.Height);
item.Bounds = PaintHelper.GetRectInBounds(cellBounds, CellSize.Width, CellSize.Height);
index++;
}
}