protected virtual void OnSelectedIndexChanging(TabPageIndexEventArgs e)
{
if (SelectedIndexChanging != null)
{
SelectedIndexChanging(this, e);
}
}
protected override void OnKeyDown(KeyEventArgs e)
{
// Raise the SelectedIndexChanging event when the user changes tabs using the keyboard. This is
// implemented in the base TabControl.OnKeyDown() method (it doesn't use the native Tab Control
// functionality), so we have to handle it here as well.
bool processed = false;
if (e.KeyCode == Keys.Tab && (e.Modifiers & Keys.Control) == Keys.Control)
{
bool shift = ((e.Modifiers & Keys.Shift) == Keys.Shift);
int newIndex = (shift ? (SelectedIndex + TabCount - 1) % TabCount : (SelectedIndex + 1) % TabCount);
TabPageIndexEventArgs args = new TabPageIndexEventArgs(newIndex);
OnSelectedIndexChanging(args);
if (args.Cancel)
{
e.Handled = true;
processed = true;
}
}
if (!processed)
{
base.OnKeyDown(e);
}
}
private bool WmSelChanging(ref Message m)
{
// When the TCN_SELCHANGING notification is received raise an event that allows user code to
// cancel the selection change.
int newIndex = HitTest(PointToClient(Control.MousePosition));
if (newIndex == -1)
{
return(false);
}
TabPageIndexEventArgs args = new TabPageIndexEventArgs(newIndex);
OnSelectedIndexChanging(args);
m.Result = (args.Cancel ? new IntPtr(1) : IntPtr.Zero);
return(args.Cancel);
}