private void rdf_OnCellUpdate(object sender, CellUpdateEventArgs e)
{
if (this.InvokeRequired)
{
this.Invoke(new UpdateEventHandler(this.rdf_OnCellUpdate), new object[] { sender, e });
return;
}
CellUpdate(e);
}
/// <summary>
/// Handles changes to an individual cell within the grid
/// </summary>
/// <param name="e"></param>
private void CellUpdate(CellUpdateEventArgs e)
{
lock (syncRoot)
{
try
{
// There are three options for locating the cell we wish to update.
// OPTION 1
// In this simulation, the data-feed generates a random cell based on
// column-index and row-index. This makes life very easy when locating
// the cell we need to update but it's not very realistic in a real-world
// application.
//
// SKACERO.ActiveRow.ActiveCell cell = this.lvBalances[e.Row, e.Column];
// OPTION 2
// In the real world it's unlikely that we'll know the cell indices;
// we're more likely to know the row key and the column-header key values which
// means that we have to actually find the cell instead of going straight
// to it.
// string keyRow = currencies[e.Row];
// string keyColumn = currencies[e.Column-1];
// SKACERO.ActiveRow.ActiveCell cell = this.lvBalances.FindCell(keyRow, keyColumn);
// OPTION 3
// If every cell is assigned a unique name then we can use it to locate
// the cell within the grid. In this example, the unique key was simply generated
// as a composite of the row name and column name but it could just as well have
// been an integer or a guid.
string keyCell = String.Format("{0}_{1}", currencies[e.Row], currencies[e.Column - 1]);
SKACERO.ActiveRow.ActiveCell cell = this.lvBalances.FindCell(keyCell);
if (cell != null)
{
// Create a new value for the cell.
decimal newValue = Decimal.Add(cell.DecimalValue, e.Increment);
// Has the value been reduced, increased, or left unchanged?
if (newValue < cell.DecimalValue)
{
// Reduced
cell.FlashBackColor = this.cbColourful.Checked ? Color.LightGreen : Color.Yellow;
cell.FlashPreTextForeColor = Color.Red;
cell.FlashPostTextForeColor = Color.Red;
cell.FlashPreText = "▼";
cell.FlashPostText = String.Empty;
}
else if (newValue > cell.DecimalValue)
{
// Increased
cell.FlashBackColor = this.cbColourful.Checked ? Color.PowderBlue : Color.Yellow;
cell.FlashPreTextForeColor = Color.Blue;
cell.FlashPostTextForeColor = Color.Blue;
cell.FlashPreText = "▲";
cell.FlashPostText = String.Empty;
}
else
{
// Unchanged
cell.FlashBackColor = Color.Yellow;
cell.FlashPreText = String.Empty;
cell.FlashPostText = String.Empty;
}
cell.DecimalValue = newValue;
}
}
catch (IndexOutOfRangeException exc)
{
MessageBox.Show(exc.Message);
}
}
}
