void SelectNextViewRow(bool next)
{
var increment = next ? 1 : -1;
int?modelRowToSelect = null; // If there are no selected rows, this is the default
var rows = SelectedRows.ToArray();
if (DataStoreView != null && rows.Length > 0)
{
// Get the last (or first, if moving back) selected view row.
// This handles multiselection.
int?currentRowViewIndex = null;
foreach (var x in rows)
{
var temp = DataStoreView.ModelToView(x);
if (temp != null &&
(currentRowViewIndex == null || Math.Sign(temp.Value - currentRowViewIndex.Value) == Math.Sign(increment)))
{
currentRowViewIndex = temp;
}
}
if (currentRowViewIndex != null)
{
var newRow = currentRowViewIndex.Value + increment; // view index
if (newRow >= 0 &&
DataStore.Count > newRow)
{
modelRowToSelect = DataStoreView.ViewToModel(newRow);
}
}
}
if (modelRowToSelect == null)
{
var viewRows = ViewRows.ToArray();
if (viewRows.Length > 0)
{
modelRowToSelect = next ? viewRows.First() : viewRows.Last();
}
}
if (modelRowToSelect != null)
{
UnselectAll();
SelectRow(modelRowToSelect.Value);
}
}
public void UnselectRow(int row)
{
ChangeSelection(() => {
areAllObjectsSelected = false;
if (selectedRows.Contains(row))
{
selectedRows.Remove(row);
}
var viewIndex = DataStoreView.ModelToView(row);
if (viewIndex != null) // can be null if the row is not in the view because it is filtered out
{
Handler.UnselectRow(viewIndex.Value);
}
});
}
/// <summary>
/// Programmatically selects a row.
/// </summary>
public void SelectRow(int row)
{
ChangeSelection(() => {
if (!AllowMultipleSelection)
{
selectedRows.Clear();
}
selectedRows.Add(row);
var viewIndex = DataStoreView.ModelToView(row);
if (viewIndex != null)
{
if (!AllowMultipleSelection)
{
Handler.UnselectAll();
}
Handler.SelectRow(viewIndex.Value);
}
});
}