bool
Control::Focus (bool recurse)
{
if (!IsAttached ())
return false;
/* according to msdn, these three things must be true for an element to be focusable:
*
* 1. the element must be visible
* 2. the element must have IsTabStop = true
* 3. the element must be part of the plugin's visual tree, and must have had its Loaded event fired.
*/
/*
* If the current control is not focusable, we walk the visual tree and stop as soon
* as we find the first focusable child. That then becomes focused
*/
Types *types = GetDeployment ()->GetTypes ();
Surface *surface = GetDeployment ()->GetSurface ();
DeepTreeWalker walker (this);
while (UIElement *e = walker.Step ()) {
if (!types->IsSubclassOf (e->GetObjectType (), Type::CONTROL))
continue;
Control *c = (Control *)e;
if (!c->GetIsEnabled ()) {
if (!recurse)
return false;
walker.SkipBranch ();
continue;
}
// A control is focusable if it is attached to a visual tree whose root
// element has been loaded
bool loaded = false;
for (UIElement *check = this; !loaded && check != NULL; check = check->GetVisualParent ())
loaded |= check->IsLoaded ();
if (loaded && c->GetRenderVisible () && c->GetIsTabStop ())
return surface->FocusElement (c);
if (!recurse)
return false;
}
return false;
}
void
Control::OnPropertyChanged (PropertyChangedEventArgs *args, MoonError *error)
{
if (args->GetProperty ()->GetOwnerType() != Type::CONTROL) {
FrameworkElement::OnPropertyChanged (args, error);
return;
}
if (args->GetId () == Control::TemplateProperty) {
if (GetSubtreeObject ())
ElementRemoved ((UIElement *) GetSubtreeObject ());
InvalidateMeasure ();
}
else if (args->GetId () == Control::PaddingProperty
|| args->GetId () == Control::BorderThicknessProperty) {
InvalidateMeasure ();
} else if (args->GetId () == Control::IsEnabledProperty) {
if (!args->GetNewValue ()->AsBool ()) {
Surface *surface = Deployment::GetCurrent ()->GetSurface ();
if (surface && surface->GetFocusedElement () == this) {
// Ensure this element loses focus, then try to focus the next suitable element
surface->FocusElement (NULL);
TabNavigationWalker::Focus (this, true);
}
ReleaseMouseCapture ();
}
PropertyChangedEventArgs *pargs = new PropertyChangedEventArgs (args->GetProperty(),
args->GetId (),
args->GetOldValue(),
args->GetNewValue());
EmitAsync (IsEnabledChangedEvent, pargs);
} else if (args->GetId () == Control::HorizontalContentAlignmentProperty
|| args->GetId () == Control::VerticalContentAlignmentProperty) {
InvalidateArrange ();
}
NotifyListenersOfPropertyChange (args, error);
}
