public int CompareTo(object obj)
{
TabStopControl t = (TabStopControl)obj;
if (t != null)
{
return(this._c.TabIndex - t._c.TabIndex);
}
return(0);
}
public void HandleTab(KeyEventArgs e)
{
// Build list of TabStop controls in the form.
if (tabStops == null)
{
tabStops = new List <TabStopControl>();
FindTabStops(_owner.Controls, tabStops);
tabStops.Sort();
}
// Find the current focussed control.
int i = 0;
for (int len = tabStops.Count - 1; i < len; i++)
{
TabStopControl t = tabStops[i];
if (t.Control.Focused)
{
break;
}
}
// Find the next in the specified direction, skipping currently invisible controls
bool forward = (e.Modifiers & Keys.Shift) == 0;
int dir = forward ? 1 : -1;
i += dir;
Control next = null;
bool wrapped = false;
while (next == null)
{
if (i < 0)
{
if (wrapped)
{
break;
}
i = tabStops.Count - 1;
wrapped = true;
}
if (i >= tabStops.Count)
{
if (wrapped)
{
break;
}
i = 0;
wrapped = true;
}
TabStopControl t = tabStops[i];
if (t.Control.Visible)
{
next = t.Control;
break;
}
i += dir;
}
// Now focus the next control.
if (next != null)
{
next.Focus();
e.Handled = true;
}
}