/// <summary>
/// Event handler registered on each MenuItem to allow the TopMenu to manage which items
/// are selected and to bubble the event up to the NavigationMenu.
/// </summary>
/// <param name="menuItem">The MenuItem that evoked the event being handled.</param>
public void MenuItemEventListener(MenuItem menuItem)
{
// De-select the old item
this._selectedItem.IsSelected = false;
// Set the new item as the selected item
this._selectedItem = menuItem;
// Set the newly selected item to selected
this._selectedItem.IsSelected = true;
// Bubble the event up
this._topMenuEvent(this, TopMenuEventType.MENUITEM_SELECTED);
}
/// <summary>
/// Add another MenuItem to this TopMenu
/// </summary>
/// <param name="menuItem">The new MenuItem to be added.</param>
public void AddMenuItem(MenuItem menuItem)
{
// Get an Enumerator for the collection of MenuItems
IEnumerator<MenuItem> menuItemsEnum = this._menuItems.GetEnumerator();
// Determine if an item already exists with the new item's ID
while (menuItemsEnum.MoveNext())
{
// If it does, throw an exception and quit
if (menuItemsEnum.Current.Id.Equals(menuItem.Id))
{
menuItemsEnum.Dispose();
throw new ApplicationException("Attempting to add MenuItem with non-unique ID.");
}
}
// Attach this TopMenu's MenuItemEvent handler to the MenuItem's event so the TopMenu
// may respond to it.
menuItem.AddMenuItemEventListener(this.MenuItemEventListener);
// If no matches are found, add the new item
this._menuItems.Add(menuItem);
// If this was the first item, set it as the selected item
if (this._menuItems.Count == 1)
{
// Set the MenuItem as selected
menuItem.IsSelected = true;
// Store a reference to the selected item for this TopMenu
this._selectedItem = menuItem;
}
// Trigger a TopMenuEvent
if (this._topMenuEvent != null)
{
this._topMenuEvent(this, TopMenuEventType.MENU_MODIFIED);
}
}
