private async Task OnRowMouseDownAsync(MouseEventArgs args, TItem item)
{
if (SelectionMode != TableSelectionMode.None)
{
var key = KeyField !(item)?.ToString();
if (key != null)
{
var alreadySelected = Selection.Contains(key);
// begin edit mode?
if (AllowEdit && !IsEditing && Selection.Count == 1 && alreadySelected && !args.CtrlKey && args.Button == 0)
{
_editTimer?.Change(500, Timeout.Infinite);
}
else
{
if (SelectionMode == TableSelectionMode.Single)
{
if (!alreadySelected)
{
Selection.Clear();
Selection.Add(key);
await SelectionChanged.InvokeAsync(null).ConfigureAwait(true);
}
}
else if (SelectionMode == TableSelectionMode.Multiple)
{
if (args.ShiftKey && Selection.Count > 0) // range selection (from last selected to row clicked on)
{
Selection.RemoveRange(0, Selection.Count - 1);
var idxFrom = ItemsToDisplay.FindIndex(x => KeyField !(x)?.ToString() == Selection[0]);
var idxTo = ItemsToDisplay.FindIndex(x => KeyField !(x)?.ToString() == key);
if (idxFrom > -1 && idxTo > -1)
{
Selection.Clear();
Selection.AddRange(ItemsToDisplay
.GetRange(Math.Min(idxFrom, idxTo), (Math.Max(idxFrom, idxTo) - Math.Min(idxFrom, idxTo)) + 1)
.Select(x => KeyField !(x).ToString()));
await SelectionChanged.InvokeAsync(null).ConfigureAwait(true);
}
}
else if (args.CtrlKey) // toggle selection
{
if (alreadySelected)
{
Selection.Remove(key);
}
else
{
Selection.Add(key);
}
await SelectionChanged.InvokeAsync(null).ConfigureAwait(true);
}
else if (!alreadySelected) // single selection
{
Selection.Clear();
Selection.Add(key);
await SelectionChanged.InvokeAsync(null).ConfigureAwait(true);
}
}
}
}
}
}
