/// <summary>
/// Invoke <cref="Change" /> event.
/// </summary>
/// <param name="e">The <cref="ChangeOccurredEventArgs" /> type event arguments.</param>
protected virtual void OnChange(ChangeOccurredEventArgs e)
{
if (Change != null)
{
Change(this, e);
}
}
/// <summary>
/// Check whether form should be closed.
/// </summary>
/// <param name="sender">The form or dialog to close.</param>
/// <returns>Returns true if <cref="sender" /> should be closed, false otherwise.</returns>
public bool CancelFormClosing(object sender)
{
ChangeDetectingEventArgs e = new ChangeDetectingEventArgs(sender, false);
OnChangeDetecting(e);
if (!e.Cancel)
{
ChangeOccurredEventArgs changedOccurredEvent = new ChangeOccurredEventArgs(sender, false);
OnChange(changedOccurredEvent);
if (changedOccurredEvent.ChangedOccurred)
{
DialogResult result = MessageBox.Show(this.InformationMessage, this.InformationCaption, MessageBoxButtons.YesNoCancel, MessageBoxIcon.Warning);
if (!result.Equals(BoxCancel))
{
OnChangeDetected(new ConfirmationActionEventArgs(sender, result));
return(false);
}
return(true);
}
}
return(e.Cancel);
}