bool
Canvas::IsLayoutContainer ()
{
Types *types = Deployment::GetCurrent ()->GetTypes ();
DeepTreeWalker walker = DeepTreeWalker (this);
while (UIElement *child = walker.Step ()) {
if (!types->IsSubclassOf (child->GetObjectType (), Type::CANVAS) && child->IsLayoutContainer ())
return true;
}
return false;
}
void
Popup::PropagateIsEnabledState (UIElement *child, bool enabled_parent)
{
DeepTreeWalker walker (child);
while (UIElement *e = walker.Step ()) {
if (!e->Is (Type::CONTROL))
continue;
Control *control = (Control *) e;
control->enabled_parent = enabled_parent;
control->UpdateEnabled ();
walker.SkipBranch ();
}
}
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;
}
