public IEnumerable <LayoutItemData> ListLayoutItems()
{
for (int i = 0; i < cells.Length; i++)
{
LayoutItemData item = cells[i];
if (item != null)
{
yield return(item);
}
}
}
public void Occupy(int column, int span, LayoutItemData item)
{
int maxC = column + span;
for (int c = column; c < maxC; c++)
{
cells[c] = item;
}
while (nextAvailableCell < columns && cells[nextAvailableCell] != null)
{
nextAvailableCell++;
}
}
public void LayoutItem(VisualElement visual)
{
int colSpan = Math.Min(Columns, GetColumnSpan(visual));
int rowSpan = GetRowSpan(visual);
if (availableRow == null)
{
availableRow = GetRow(rows.Count);
}
LayoutRow startRow = availableRow;
int startColumn = startRow.NextAvailableColumn;
int?foundCol = null;
int rowUpper = 0;
while (foundCol == null)
{
foundCol = startRow.FindAvailableColumn(startColumn, colSpan);
rowUpper = startRow.RowNo + rowSpan;
if (foundCol == null)
{
startRow = GetRow(startRow.RowNo + 1);
startColumn = startRow.NextAvailableColumn;
continue;
}
for (int r = startRow.RowNo + 1; r < rowUpper; r++)
{
LayoutRow nextRow = GetRow(r);
if (nextRow.IsFull)
{
foundCol = null;
startRow = GetRow(nextRow.RowNo + 1);
startColumn = startRow.NextAvailableColumn;
break;
}
if (GetRow(r).FindAvailableColumn(startColumn, colSpan) == null)
{
foundCol = null;
startColumn++;
break;
}
}
}
var item = new LayoutItemData(visual, startRow.RowNo, startColumn, colSpan);
for (int r = startRow.RowNo; r < rowUpper; r++)
{
rows[r].Occupy(startColumn, colSpan, item);
}
while (availableRow != null && availableRow.IsFull)
{
int nextAvailableRowNo = availableRow.RowNo + 1;
availableRow = nextAvailableRowNo < rows.Count
? rows[nextAvailableRowNo]
: null;
}
}
