/// <summary>
/// Inserts the display control for the specified cell.
/// </summary>
/// <param name="cellRef">The cell reference.</param>
private void InsertDisplayControl(CellRef cellRef)
{
var e = this.CreateDisplayControl(cellRef, null, null);
SetElementPosition(e, cellRef);
this.sheetGrid.Children.Insert(this.cellInsertionIndex, e);
this.cellInsertionIndex++;
this.cellMap.Add(cellRef.GetHashCode(), e);
}
/// <summary>
/// Gets the element at the specified cell.
/// </summary>
/// <param name="cellRef">The cell reference.</param>
/// <returns>
/// The element, or <c>null</c> if the cell was not found.
/// </returns>
public UIElement GetCellElement(CellRef cellRef)
{
UIElement e;
return this.cellMap.TryGetValue(cellRef.GetHashCode(), out e) ? e : null;
}
/// <summary>
/// Adds the display control for the specified cell.
/// </summary>
/// <param name="cellRef">The cell reference.</param>
private void AddDisplayControl(CellRef cellRef)
{
var e = this.CreateDisplayControl(cellRef, null, null);
if (e == null)
{
return;
}
SetElementPosition(e, cellRef);
this.sheetGrid.Children.Add(e);
this.cellMap.Add(cellRef.GetHashCode(), e);
}
/// <summary>
/// Updates the content of the specified cell.
/// </summary>
/// <param name="cellRef">The cell reference.</param>
protected void UpdateCellContent(CellRef cellRef)
{
var c = this.GetCellElement(cellRef);
if (c != null)
{
this.sheetGrid.Children.Remove(c);
this.cellInsertionIndex--;
this.cellMap.Remove(cellRef.GetHashCode());
}
this.InsertDisplayControl(cellRef);
}
/// <summary>
/// The insert cell element.
/// </summary>
/// <param name="cellRef">
/// The cell ref.
/// </param>
/// <param name="value">
/// The value.
/// </param>
/// <param name="insert">
/// The insert.
/// </param>
private void InsertCellElement(CellRef cellRef, object value, bool insert)
{
// if (value == null)
// return;
var e = this.CreateElement(cellRef, null);
SetElementPosition(e, cellRef);
if (insert)
{
this.sheetGrid.Children.Insert(this.cellInsertionIndex, e);
this.cellInsertionIndex++;
}
else
{
this.sheetGrid.Children.Add(e);
}
this.cellMap.Add(cellRef.GetHashCode(), e);
}
/// <summary>
/// Virtualizes the UIElements for the visible cells.
/// Adds elements for the visible cells not currently in the logical tree.
/// Removes elements for the nonvisible cells.
/// </summary>
protected void VirtualizeCells()
{
CellRef cell1, cell2;
this.GetVisibleCells(out cell1, out cell2);
if (cell1.Column < 0)
{
return;
}
var delete = this.cellMap.Keys.ToList();
for (int i = cell1.Row; i <= cell2.Row; i++)
{
for (int j = cell1.Column; j <= cell2.Column; j++)
{
var cellRef = new CellRef(i, j);
var c = this.GetCellElement(cellRef);
if (c == null)
{
// The cell is not currently in the collection - add it
this.UpdateCellContent(cellRef);
}
else
{
// the cell is currently in the collection - keep it (remove it from the delete keys)
delete.Remove(cellRef.GetHashCode());
}
}
}
foreach (var hash in delete)
{
var cell = this.cellMap[hash];
this.sheetGrid.Children.Remove(cell);
this.cellInsertionIndex--;
this.cellMap.Remove(hash);
}
}
protected void UpdateCellContent(CellRef cellRef)
{
var c = GetCellElement(cellRef);
var value = GetCellValue(cellRef);
if (c != null)
{
sheetGrid.Children.Remove(c);
cellInsertionIndex--;
cellMap.Remove(cellRef.GetHashCode());
}
InsertCellElement(cellRef, value, true);
}