Example #1
0
        /// <summary>
        /// Overrides the window's OnClosing method and calls the Viewmodel's
        /// <see cref="MVVMbasics.Viewmodels.BaseViewmodel.CancelNavigatingFrom">CancelNavigatingFrom</see> method,
        /// allowing the actual (derived) window class to cancel the unload operation.
        /// </summary>
        /// <param name="e"></param>
        protected override void OnClosing(System.ComponentModel.CancelEventArgs e)
        {
            InstantiateViewmodel();
            if (Viewmodel != null)
            {
                e.Cancel = Viewmodel.CancelNavigatingFrom(ViewState.Closed);
            }

            base.OnClosing(e);
        }
Example #2
0
        /// <summary>
        /// Overrides the page's OnNavigatingFrom method and calls the Viewmodel's
        /// <see cref="MVVMbasics.Viewmodels.BaseViewmodel.CancelNavigatingFrom">CancelNavigatingFrom</see> method,
        /// allowing the actual (derived) window class to cancel the navigation.
        /// </summary>
        /// <param name="e"></param>
        protected override void OnNavigatingFrom(NavigatingCancelEventArgs e)
        {
            InstantiateViewmodel();
            if (Viewmodel != null)
            {
                ViewState viewState;
                if (e.NavigationMode == NavigationMode.Back || IsMvvmBasicsBackNavigation())
                {
                    viewState = ViewState.Closed;

                    // If parameters for the backward navigation have been stored, pass them on to the previous page!
                    if (BackParameters != null)
                    {
                        if (BackParameters.Count > 0)
                        {
                            var application = Application.Current as BaseApplication;
                            if (application != null)
                            {
                                Frame frame = application.RootFrame;
                                if (frame != null)
                                {
                                    frame.Navigated += (sender, args) =>
                                    {
                                        var previousView = args.Content as BaseView;
                                        if (previousView != null)
                                        {
                                            previousView.Parameters = BackParameters;
                                        }
                                    };
                                }
                            }
                        }
                    }
                }
                else
                {
                    viewState = ViewState.Deactivated;                     // switching to another page inside the App

                    if (NavigatorServiceReference != null)
                    {
                        // Store the current Viewmodel's instance on the back stack
                        NavigatorServiceReference.AddToBackstack(Viewmodel);
                    }
                }
                e.Cancel = Viewmodel.CancelNavigatingFrom(viewState);
            }

            base.OnNavigatingFrom(e);
        }