/// <summary>
/// Tell the world when a cell is about to finish being edited.
/// </summary>
protected virtual void OnCellEditFinishing(CellEditEventArgs e) {
if (this.CellEditFinishing != null)
this.CellEditFinishing(this, e);
}
/// <summary>
/// Tell the world when a cell is about to finish being edited.
/// </summary>
protected virtual void OnCellEditorValidating(CellEditEventArgs e) {
// Hack. ListView is an imperfect control container. It does not manage validation
// perfectly. If the ListView is part of a TabControl, and the cell editor loses
// focus by the user clicking on another tab, the TabControl processes the click
// and switches tabs, even if this Validating event cancels. This results in the
// strange situation where the cell editor is active, but isn't visible. When the
// user switches back to the tab with the ListView, composite controls like spin
// controls, DateTimePicker and ComboBoxes do not work properly. Specifically,
// keyboard input still works fine, but the controls do not respond to mouse
// input. SO, if the validation fails, we have to specifically give focus back to
// the cell editor. (this is the Select() call in the code below).
// But (there is always a 'but'), doing that changes the focus so the cell editor
// triggers another Validating event -- which fails again. From the user's point
// of view, they click away from the cell editor, and the validating code
// complains twice. So we only trigger a Validating event if more than 0.1 seconds
// has elapsed since the last validate event.
// I know it's a hack. I'm very open to hear a neater solution.
// Also, this timed response stops us from sending a series of validation events
// if the user clicks and holds on the OLV scroll bar.
if ((Environment.TickCount - lastValidatingEvent) < 500) {
e.Cancel = true;
} else {
lastValidatingEvent = Environment.TickCount;
if (this.CellEditValidating != null)
this.CellEditValidating(this, e);
}
lastValidatingEvent = Environment.TickCount;
}