Any example of changing menus and supporting closing for an 'AllActive' tabbed application? - tabcontrol

Question

I'm a CM newbie and trying to get my head around CM. I am building an application where each tab allows the user different functionality for accessing a server where the active work in all tabs (if any is active) could be running async to each other so the shell is an "Conductor.Collection.AllActive" which I hope was the correct choice. I am looking for suggestions or an sample in two areas -
I would like to have the main shell own the application menu and the tab control, and to change the application menuitems depending on the tab selected and then have the menuitem clicks routed to the respective VM for the tab.
Since all tabs could potentially be doing active work simultaneously, I am hoping for an example of how the VM on each tab can participate in helping to decide (via dialogs to the user) if the application can be closed if the close menuitem or the application X icon is clicked. Or if the close should be cancelled per the user response (e.g. they say 'no' since there are unsaved files).
Any examples and suggestions much appreciated.

Answer 1

I created a sample of a possible way to do this. Using a SharedViewModel that contains a collection of MenuItems. The SharedViewModel is injected into the ShellViewModel and each TabViewModel. The Menu control binds to the collection of MenuItems.
When a tab's OnActivate fires the Menu items can be updated by the TabViewModel.
<HierarchicalDataTemplate DataType="{x:Type viewModels:MenuItemViewModel}"
ItemsSource="{Binding Path=MenuItems}">
<ContentControl cal:View.Model="{Binding}" />
</HierarchicalDataTemplate>
<Menu IsMainMenu="True"
ItemsSource="{Binding SharedViewModel.MenuItems}" />
SharedViewModel:
public class SharedViewModel : PropertyChangedBase
{
private List<MenuItemViewModel> _menuItems;
public List<MenuItemViewModel> MenuItems
{
get { return _menuItems; }
set
{
_menuItems = value;
NotifyOfPropertyChange(() => MenuItems);
}
}
}
Example of a TabViewModel updating the Menu:
protected override void OnActivate()
{
base.OnActivate();
SharedViewModel.MenuItems = new List<MenuItemViewModel>
{
new MenuItemViewModel
{
Header = "MainMenuItem1",
MenuItems =
new List<MenuItemViewModel>
{
new MenuItemViewModel {Header = "SubMenuItem1"},
new MenuItemViewModel {Header = "SubMenuItem2"},
}
},
new MenuItemViewModel
{
Header = "MainMenuItem2",
MenuItems =
new List<MenuItemViewModel>
{
new MenuItemViewModel {Header = "SubMenuItem1"},
new MenuItemViewModel {Header = "SubMenuItem2"},
}
}
};
}