/// <summary>
/// Sets focus to the default control of a dialog
/// </summary>
private void FocusDefaultControl()
{
// Check for a default control in this dialog
foreach(Control c in controlList)
{
if (c.isDefault)
{
// Remove focus from the current control
ClearFocus();
// Give focus to the default control
controlFocus = c;
controlFocus.OnFocusIn();
return;
}
}
}
/// <summary>
/// Cycles focus to the next available control
/// </summary>
private void OnCycleFocus(bool forward)
{
// This should only be handled by the dialog which owns the focused control, and
// only if a control currently has focus
if (controlFocus == null || controlFocus.Parent != this )
return;
Control control = controlFocus;
// Go through a bunch of controls
for (int i = 0; i < 0xffff; i++)
{
control = (forward) ? GetNextControl(control) : GetPreviousControl(control);
// If we've gone in a full circle, focus won't change
if (control == controlFocus)
return;
// If the dialog accepts keybord input and the control can have focus then
// move focus
if (control.Parent.IsUsingKeyboardInput && control.CanHaveFocus)
{
controlFocus.OnFocusOut();
controlFocus = control;
controlFocus.OnFocusIn();
return;
}
}
throw new InvalidOperationException("Multiple dialogs are improperly chained together.");
}
/// <summary>
/// Request that this control has focus
/// </summary>
public static void RequestFocus(Control control)
{
if (controlFocus == control)
return; // Already does
if (!control.CanHaveFocus)
return; // Can't have focus
if (controlFocus != null)
controlFocus.OnFocusOut();
// Set the control focus now
control.OnFocusIn();
controlFocus = control;
}
