/// <summary>
/// Ensures the nav menu reflects reality when navigation is triggered outside of
/// the nav menu buttons.
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void OnNavigatingToPage(object sender, NavigatingCancelEventArgs e)
{
if (e.NavigationMode == NavigationMode.Back)
{
var item =
(from p in navlistTop.Union(navlistBottom) where p.DestPage == e.SourcePageType select p)
.SingleOrDefault();
if (item == null && AppMyFrame.BackStackDepth > 0)
{
// In cases where a page drills into sub-pages then we'll highlight the most recent
// navigation menu item that appears in the BackStack
foreach (var entry in AppMyFrame.BackStack.Reverse())
{
item =
(from p in navlistTop.Union(navlistBottom) where p.DestPage == entry.SourcePageType select p)
.SingleOrDefault();
if (item != null)
{
break;
}
}
}
var container = (ListViewItem)NavMenuListTop.ContainerFromItem(item);
if (container == null)
{
container = (ListViewItem)NavMenuListBottom.ContainerFromItem(item);
// While updating the selection state of the item prevent it from taking keyboard focus. If a
// user is invoking the back button via the keyboard causing the selected nav menu item to change
// then focus will remain on the back button.
//this is for the bottom section
if (container != null)
{
container.IsTabStop = false;
}
NavMenuListBottom.SetSelectedItem(container);
if (container != null)
{
container.IsTabStop = true;
}
//reset the top section
NavMenuListTop.SetSelectedItem(null);
}
else
{
// and this is for the top section
container.IsTabStop = false;
NavMenuListTop.SetSelectedItem(container);
container.IsTabStop = true;
//reset the bottom section
NavMenuListBottom.SetSelectedItem(null);
}
}
//Change the theme on page navigation; maybe it can be moved somewhere else.
SetColor();
}
/// <summary>
/// Navigate to the Page for the selected <paramref name="listViewItem" />.
/// </summary>
/// <param name="sender"></param>
/// <param name="listViewItem"></param>
private async void NavMenuList_ItemInvoked(object sender, ListViewItem listViewItem)
{
var item = (NavMenuItem)((NavMenuListView)sender).ItemFromContainer(listViewItem);
if (item?.DestPage != null &&
item.DestPage != MyAppFrame.CurrentSourcePageType)
{
if (item.DestViewModel == typeof(AccountListViewModel))
{
await ViewModel.ShowAccountListCommand.ExecuteAsync();
}
else if (item.DestViewModel == typeof(StatisticSelectorViewModel))
{
await ViewModel.ShowStatisticSelectorCommand.ExecuteAsync();
}
else if (item.DestViewModel == typeof(CategoryListViewModel))
{
await ViewModel.ShowCategoryListCommand.ExecuteAsync();
}
else if (item.DestViewModel == typeof(BackupViewModel))
{
await ViewModel.ShowBackupViewCommand.ExecuteAsync();
}
else if (item.DestViewModel == typeof(SettingsViewModel))
{
await ViewModel.ShowSettingsCommand.ExecuteAsync();
}
else if (item.DestViewModel == typeof(AboutViewModel))
{
await ViewModel.ShowAboutCommand.ExecuteAsync();
}
}
//reset the bottom or top section depending on which section the user clicked
if (sender.Equals(NavMenuListTop))
{
NavMenuListBottom.SetSelectedItem(null);
}
else
{
NavMenuListTop.SetSelectedItem(null);
}
}
private void NavMenuList_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
//Show the back button
SystemNavigationManager.GetForCurrentView().AppViewBackButtonVisibility = AppViewBackButtonVisibility.Visible;
//Change the title
var selectedItem = (sender as NavMenuListView).SelectedValue;
PageTitle.Text = (selectedItem as NavMenuItem)?.Label ?? "There should be a title here.";
//Deselect the other item
if (sender.Equals(NavMenuList))
{
NavMenuListBottom.SetSelectedItem(null);
}
else
{
NavMenuList.SetSelectedItem(null);
}
}
/// <summary>
/// Navigate to the Page for the selected <paramref name="listViewItem" />.
/// </summary>
/// <param name="sender"></param>
/// <param name="listViewItem"></param>
private void NavMenuList_ItemInvoked(object sender, ListViewItem listViewItem)
{
var item = (NavMenuItem)((NavMenuListView)sender).ItemFromContainer(listViewItem);
if (item?.DestPage != null &&
item.DestPage != MyAppFrame.CurrentSourcePageType)
{
ViewModel.ShowViewModelByType(item.DestViewModel);
}
//reset the bottom or top section depending on which section the user clicked
if (sender.Equals(NavMenuListTop))
{
NavMenuListBottom.SetSelectedItem(null);
}
else
{
NavMenuListTop.SetSelectedItem(null);
}
}
