protected override Size MeasureOverride(Size availableSize)
{
int count = Children.Count;
var requiredSize = new Size(
Padding.Left + Padding.Right,
Padding.Top + Padding.Bottom);
if (count == 0)
{
Cells = null;
return(requiredSize);
}
int row, col;
double itemWidth;
double itemHeight;
#region cal item size and row col
var clientSize = new Size(
availableSize.Width - Padding.Left - Padding.Right,
availableSize.Height - Padding.Top - Padding.Bottom);
if (Orientation == Orientation.Horizontal)
{
col = MaximumRowsOrColumns;
row = (int)Math.Ceiling((double)count / col);
}
else
{
row = MaximumRowsOrColumns;
col = (int)Math.Ceiling((double)count / row);
}
if (double.IsNaN(FixedEdge) || FixedEdge == 0)
{
if (Orientation == Orientation.Horizontal)
{
if (double.IsInfinity(clientSize.Width))
{
itemWidth = GetChildrenMaxSize(clientSize).Width;
}
else
{
itemWidth = (clientSize.Width - (col - 1) * HorizontalSpacing) / (3 * col + 1) * 4;
}
itemHeight = GetHeightFromWidth(itemWidth);
}
else
{
if (double.IsInfinity(clientSize.Height))
{
itemHeight = GetChildrenMaxSize(clientSize).Height;
}
else
{
itemHeight = (clientSize.Height - (row - 1) * Spacing - VerticalSpacing) / (row + 0.5);
}
itemWidth = GetWidthFromHeight(itemHeight);
}
}
else
{
itemWidth = GetWidthFromEdge(FixedEdge);
itemHeight = GetHeightFromEdge(FixedEdge);
if (Orientation == Orientation.Horizontal)
{
if (!double.IsInfinity(clientSize.Width))
{
var needCol = (int)Math.Floor(
(clientSize.Width - itemWidth / 4 + HorizontalSpacing)
/ (3 * itemWidth / 4 + HorizontalSpacing));
col = Math.Min(needCol, MaximumRowsOrColumns);
row = (int)Math.Ceiling((double)count / col);
}
}
else
{
if (!double.IsInfinity(clientSize.Height))
{
var needRow = (int)Math.Floor(
(clientSize.Height - itemHeight * 0.5 + Spacing - VerticalSpacing)
/ (itemHeight + 1));
row = Math.Min(needRow, MaximumRowsOrColumns);
col = (int)Math.Ceiling((double)count / row);
}
}
}
#endregion
Cells = new SimpleMatrix <Rect>(row, col);
initCells(itemWidth, itemHeight);
var itemSize = new Size(itemWidth, itemHeight);
foreach (var item in Children)
{
item.Measure(itemSize);
}
var bounds = Cells.GetOutBounds();
requiredSize.Width += bounds.Width;
requiredSize.Height += bounds.Height;
return(requiredSize);
}
protected override Size MeasureOverride(Size availableSize)
{
//Debug.WriteLine(requestMeasure + " " + measureId);
int count = Children.Count;
var requiredSize = new Size(
Padding.Left + Padding.Right,
Padding.Top + Padding.Bottom);
if (count == 0 || ColumnCount == 0 || RowCount == 0)
{
return(requiredSize);
}
try
{
measureInProgress = true;
measureId = requestMeasure;
Cells = new SimpleMatrix <Rect>(RowCount, ColumnCount);
double itemWidth;
double itemHeight;
#region cal itemWidth and itemHeight
if (double.IsNaN(FixedEdge) || FixedEdge == 0)
{
var clientSize = new Size(
availableSize.Width - Padding.Left - Padding.Right,
availableSize.Height - Padding.Top - Padding.Bottom);
if (ColumnCount == 1)
{
var heightFromClient = (clientSize.Height - (RowCount - 1) * Spacing) / RowCount;
var heightFromClientWidth = GetHeightFromWidth(clientSize.Width);
itemHeight = Math.Min(heightFromClient, heightFromClientWidth);
itemWidth = GetWidthFromHeight(itemHeight);
}
else
{
if (double.IsInfinity(clientSize.Width) &&
double.IsInfinity(clientSize.Height))
{
var size = GetChildrenMaxSize(clientSize);
itemWidth = size.Width;
itemHeight = size.Height;
}
else if (double.IsInfinity(clientSize.Width))
{
itemHeight = (clientSize.Height - (RowCount - 1) * Spacing - VerticalSpacing) / (RowCount + 0.5);
itemWidth = GetWidthFromHeight(itemHeight);
}
else if (double.IsInfinity(clientSize.Height))
{
itemWidth = (clientSize.Width - (ColumnCount - 1) * HorizontalSpacing) / (3 * ColumnCount + 1) * 4;
itemHeight = GetHeightFromWidth(itemWidth);
}
else
{
var bestWidth = (clientSize.Width - (ColumnCount - 1) * HorizontalSpacing) / (3 * ColumnCount + 1) * 4;
var bestHeight = (clientSize.Height - (RowCount - 1) * Spacing - VerticalSpacing) / (RowCount + 0.5);
var widthFromBestHeight = GetWidthFromHeight(bestHeight);
itemWidth = Math.Min(bestWidth, widthFromBestHeight);
itemHeight = GetHeightFromWidth(itemWidth);
}
}
}
else
{
itemWidth = GetWidthFromEdge(FixedEdge);
itemHeight = GetHeightFromEdge(FixedEdge);
}
#endregion
initCells(itemWidth, itemHeight);
var itemSize = new Size(itemWidth, itemHeight);
foreach (var item in Children)
{
item.Measure(itemSize);
}
var bounds = Cells.GetOutBounds();
requiredSize.Width += bounds.Width;
requiredSize.Height += bounds.Height;
return(requiredSize);
}
finally
{
measureInProgress = false;
if (isDirty())
{
InvalidateMeasure();
}
else
{
measureId = 0;
requestMeasure = 0;
}
}
}
