//This function handles MainPage.Loaded event.
//This event fires, when navigate to MainPage with NavigationService.GoBake()
//or NavigationService.Navigate(). Such navigation appear when the user navigates
//from EditItemPage, SettingsPage, SkyDrive etc.
//The most important navigation is - MainPage <- SettingsPage, because there user select
//Pivot display mode or Filter list mode.
//In this case it's necessary to update layout if it is not valid.
private void MainPage_Loaded(object sender, RoutedEventArgs e)
{
//To choose what layout to display (Pivot control or Filtered list)
//at first check application settings and check current layout.
//If current layout is invalid - change layout with deleting old
//displaying control and inserting new control for corresponding settings.
if (LayoutRoot.Children.Count == 1)
{
if ((bool)App.Settings.FiltersSettings)
{
//Using Pivot layout for the MainPage
Control elem = new CustomFilterListControl();
LayoutRoot.Children.Insert(0, elem);
}
else
{
//Using Filtered list layout
Control elem = new CustomPivotControl();
LayoutRoot.Children.Insert(0, elem);
}
}
else if (LayoutRoot.Children.Count == 2)
{
Control currentControl = LayoutRoot.Children[0] as Control;
Type type = currentControl.GetType();
//Displaying Pivot control
if ((bool)App.Settings.FiltersSettings && type == typeof(CustomPivotControl))
{
LayoutRoot.Children.RemoveAt(0);
Control newControl = new CustomFilterListControl();
LayoutRoot.Children.Insert(0, newControl);
}
//Displaying Filtered list
else if (!(bool)App.Settings.FiltersSettings && type == typeof(CustomFilterListControl))
{
LayoutRoot.Children.RemoveAt(0);
Control newControl = new CustomPivotControl();
LayoutRoot.Children.Insert(0, newControl);
}
else
{
//Nothing to do, because MainPage layout is valid
}
}
//If 'LayoutRoot' grid contain more than 2 children, than we have an exception
//with current layout
else
{
throw new Exception("There is an exception in the page's layout");
}
//Close splash screen
splashScreenPopup.IsOpen = false;
PopupSplashScreen screen = splashScreenPopup.Child as PopupSplashScreen;
screen.loadingProgress.IsIndeterminate = false;
}
// Constructor
public MainPage()
{
InitializeComponent();
splashScreenPopup = new Popup();
splashScreenPopup.Child = new PopupSplashScreen();
splashScreenPopup.IsOpen = true;
//Set the MainPage.Loaded handler
this.Loaded += new RoutedEventHandler(MainPage_Loaded);
//Checking loading data from database
if (!App.ViewModel.IsDataLoaded)
{
//If data is not loaded from database than - Load
App.ViewModel.LoadData();
}
// Set the data context of the listbox control to the sample data
DataContext = App.ViewModel;
//If there is an empty database (first start of application?)?
if (App.ViewModel.ShoppingLists.Count == 0)
//Than add new empty list with "my new list" name
App.ViewModel.AddNewList(new ShoppingList() { ListName = "my new list" });
//Choosing what layout to display on the MainPage of application - Pivot or Filtered list.
//For Pivot layout using CustomPivotControl, for Filtered list - CustomFilteredListControl.
//All this controls have specific layout to display Lists and list items in corresponding way
//
//With the start of application 'LaytouRoot' grid has one child
// - it's a grid, that contain 'Add' button and TaxtBox to input new item's name.
//Thus, for display the shopping lists from database it's necessary to add the control
//with corresponding layout.
if ((bool)App.Settings.FiltersSettings)
{
//Using Pivot layout for the MainPage
Control elem = new CustomFilterListControl();
LayoutRoot.Children.Insert(0, elem);
}
else
{
//Using Filtered list layout
Control elem = new CustomPivotControl();
LayoutRoot.Children.Insert(0, elem);
}
}