How to use SaveStateEventHandler method of AppUIBasics.Common.NavigationHelper class

Best WinAppDriver code snippet using AppUIBasics.Common.NavigationHelper.SaveStateEventHandler

NavigationHelper.cs

Source:NavigationHelper.cs

...86        /// the LoadState event handler. Save the state in case87        /// the application is suspended or the page is discarded88        /// from the navigation cache.89        /// </summary>90        public event SaveStateEventHandler SaveState;91        /// <summary>92        /// Invoked when this page is about to be displayed in a Frame.93        /// This method calls <see cref="LoadState"/>, where all page specific94        /// navigation and process lifetime management logic should be placed.95        /// </summary>96        /// <param name="e">Event data that describes how this page was reached.  The Parameter97        /// property provides the group to be displayed.</param>98        public void OnNavigatedTo(NavigationEventArgs e)99        {100            var frameState = SuspensionManager.SessionStateForFrame(this.Frame);101            this._pageKey = "Page-" + this.Frame.BackStackDepth;102            if (e.NavigationMode == NavigationMode.New)103            {104                // Clear existing state for forward navigation when adding a new page to the105                // navigation stack106                var nextPageKey = this._pageKey;107                int nextPageIndex = this.Frame.BackStackDepth;108                while (frameState.Remove(nextPageKey))109                {110                    nextPageIndex++;111                    nextPageKey = "Page-" + nextPageIndex;112                }113                // Pass the navigation parameter to the new page114                this.LoadState?.Invoke(this, new LoadStateEventArgs(e.Parameter, null));115            }116            else117            {118                // Pass the navigation parameter and preserved page state to the page, using119                // the same strategy for loading suspended state and recreating pages discarded120                // from cache121                this.LoadState?.Invoke(this, new LoadStateEventArgs(e.Parameter, (Dictionary<string, object>)frameState[this._pageKey]));122            }123        }124        /// <summary>125        /// Invoked when this page will no longer be displayed in a Frame.126        /// This method calls <see cref="SaveState"/>, where all page specific127        /// navigation and process lifetime management logic should be placed.128        /// </summary>129        /// <param name="e">Event data that describes how this page was reached.  The Parameter130        /// property provides the group to be displayed.</param>131        public void OnNavigatedFrom(NavigationEventArgs e)132        {133            var frameState = SuspensionManager.SessionStateForFrame(this.Frame);134            var pageState = new Dictionary<string, object>();135            this.SaveState?.Invoke(this, new SaveStateEventArgs(pageState));136            frameState[_pageKey] = pageState;137        }138        #endregion139    }140    /// <summary>141    /// RootFrameNavigationHelper registers for standard mouse and keyboard142    /// shortcuts used to go back and forward. There should be only one143    /// RootFrameNavigationHelper per view, and it should be associated with the144    /// root frame.145    /// </summary>146    /// <example>147    /// To make use of RootFrameNavigationHelper, create an instance of the148    /// RootNavigationHelper such as in the constructor of your root page.149    /// <code>150    ///     public MyRootPage()151    ///     {152    ///         this.InitializeComponent();153    ///         this.rootNavigationHelper = new RootNavigationHelper(MyFrame);154    ///     }155    /// </code>156    /// </example>157    [Windows.Foundation.Metadata.WebHostHidden]158    public class RootFrameNavigationHelper159    {160        private Frame Frame { get; set; }161        SystemNavigationManager systemNavigationManager;162        private Microsoft.UI.Xaml.Controls.NavigationView CurrentNavView { get; set; }163        /// <summary>164        /// Initializes a new instance of the <see cref="RootNavigationHelper"/> class.165        /// </summary>166        /// <param name="rootFrame">A reference to the top-level frame.167        /// This reference allows for frame manipulation and to register navigation handlers.</param>168        public RootFrameNavigationHelper(Frame rootFrame, Microsoft.UI.Xaml.Controls.NavigationView currentNavView)169        {170            this.Frame = rootFrame;171            this.Frame.Navigated += (s, e) =>172            {173                // Update the Back button whenever a navigation occurs.174                UpdateBackButton();175            };176            this.CurrentNavView = currentNavView;177            // Handle keyboard and mouse navigation requests178            this.systemNavigationManager = SystemNavigationManager.GetForCurrentView();179            systemNavigationManager.BackRequested += SystemNavigationManager_BackRequested;180            // must register back requested on navview181            if (ApiInformation.IsApiContractPresent("Windows.Foundation.UniversalApiContract", 6))182            {183                CurrentNavView.BackRequested += NavView_BackRequested;184            }185            // Listen to the window directly so we will respond to hotkeys regardless186            // of which element has focus.187            Window.Current.CoreWindow.Dispatcher.AcceleratorKeyActivated +=188                CoreDispatcher_AcceleratorKeyActivated;189            Window.Current.CoreWindow.PointerPressed +=190                this.CoreWindow_PointerPressed;191        }192        private void NavView_BackRequested(Microsoft.UI.Xaml.Controls.NavigationView sender, Microsoft.UI.Xaml.Controls.NavigationViewBackRequestedEventArgs args)193        {194            TryGoBack();195        }196        private bool TryGoBack()197        {198            // don't go back if the nav pane is overlayed199            if (this.CurrentNavView.IsPaneOpen && (this.CurrentNavView.DisplayMode == Microsoft.UI.Xaml.Controls.NavigationViewDisplayMode.Compact || this.CurrentNavView.DisplayMode == Microsoft.UI.Xaml.Controls.NavigationViewDisplayMode.Minimal))200            {201                return false;202            }203            bool navigated = false;204            if (this.Frame.CanGoBack)205            {206                this.Frame.GoBack();207                navigated = true;208            }209            210            return navigated;211        }212        private bool TryGoForward()213        {214            bool navigated = false;215            if (this.Frame.CanGoForward)216            {217                this.Frame.GoForward();218                navigated = true;219            }220            return navigated;221        }222        private void SystemNavigationManager_BackRequested(object sender, BackRequestedEventArgs e)223        {224            if (!e.Handled)225            {226                e.Handled = TryGoBack();227            }228        }229        private void UpdateBackButton()230        {231            if (ApiInformation.IsApiContractPresent("Windows.Foundation.UniversalApiContract", 6))232            {233                this.CurrentNavView.IsBackEnabled = this.Frame.CanGoBack ? true : false;234            } else235            {236                systemNavigationManager.AppViewBackButtonVisibility = this.Frame.CanGoBack ? AppViewBackButtonVisibility.Visible : AppViewBackButtonVisibility.Collapsed;237            }238            239        }240        /// <summary>241        /// Invoked on every keystroke, including system keys such as Alt key combinations.242        /// Used to detect keyboard navigation between pages even when the page itself243        /// doesn't have focus.244        /// </summary>245        /// <param name="sender">Instance that triggered the event.</param>246        /// <param name="e">Event data describing the conditions that led to the event.</param>247        private void CoreDispatcher_AcceleratorKeyActivated(CoreDispatcher sender,248            AcceleratorKeyEventArgs e)249        {250            var virtualKey = e.VirtualKey;251            // Only investigate further when Left, Right, or the dedicated Previous or Next keys252            // are pressed253            if ((e.EventType == CoreAcceleratorKeyEventType.SystemKeyDown ||254                e.EventType == CoreAcceleratorKeyEventType.KeyDown) &&255                (virtualKey == VirtualKey.Left || virtualKey == VirtualKey.Right ||256                (int)virtualKey == 166 || (int)virtualKey == 167))257            {258                var coreWindow = Window.Current.CoreWindow;259                var downState = CoreVirtualKeyStates.Down;260                bool menuKey = (coreWindow.GetKeyState(VirtualKey.Menu) & downState) == downState;261                bool controlKey = (coreWindow.GetKeyState(VirtualKey.Control) & downState) == downState;262                bool shiftKey = (coreWindow.GetKeyState(VirtualKey.Shift) & downState) == downState;263                bool noModifiers = !menuKey && !controlKey && !shiftKey;264                bool onlyAlt = menuKey && !controlKey && !shiftKey;265                if (((int)virtualKey == 166 && noModifiers) ||266                    (virtualKey == VirtualKey.Left && onlyAlt))267                {268                    // When the previous key or Alt+Left are pressed navigate back269                    e.Handled = TryGoBack();270                }271                else if (((int)virtualKey == 167 && noModifiers) ||272                    (virtualKey == VirtualKey.Right && onlyAlt))273                {274                    // When the next key or Alt+Right are pressed navigate forward275                    e.Handled = TryGoForward();276                }277            }278        }279        /// <summary>280        /// Invoked on every mouse click, touch screen tap, or equivalent interaction.281        /// Used to detect browser-style next and previous mouse button clicks282        /// to navigate between pages.283        /// </summary>284        /// <param name="sender">Instance that triggered the event.</param>285        /// <param name="e">Event data describing the conditions that led to the event.</param>286        private void CoreWindow_PointerPressed(CoreWindow sender,287            PointerEventArgs e)288        {289            var properties = e.CurrentPoint.Properties;290            // Ignore button chords with the left, right, and middle buttons291            if (properties.IsLeftButtonPressed || properties.IsRightButtonPressed ||292                properties.IsMiddleButtonPressed)293                return;294            // If back or forward are pressed (but not both) navigate appropriately295            bool backPressed = properties.IsXButton1Pressed;296            bool forwardPressed = properties.IsXButton2Pressed;297            if (backPressed ^ forwardPressed)298            {299                e.Handled = true;300                if (backPressed) this.TryGoBack();301                if (forwardPressed) this.TryGoForward();302            }303        }304    }305    /// <summary>306    /// Represents the method that will handle the <see cref="NavigationHelper.LoadState"/>event307    /// </summary>308    public delegate void LoadStateEventHandler(object sender, LoadStateEventArgs e);309    /// <summary>310    /// Represents the method that will handle the <see cref="NavigationHelper.SaveState"/>event311    /// </summary>312    public delegate void SaveStateEventHandler(object sender, SaveStateEventArgs e);313    /// <summary>314    /// Class used to hold the event data required when a page attempts to load state.315    /// </summary>316    public class LoadStateEventArgs : EventArgs317    {318        /// <summary>319        /// The parameter value passed to <see cref="Frame.Navigate(Type, object)"/>320        /// when this page was initially requested.321        /// </summary>322        public object NavigationParameter { get; private set; }323        /// <summary>324        /// A dictionary of state preserved by this page during an earlier325        /// session.  This will be null the first time a page is visited.326        /// </summary>...

SaveStateEventHandler

Using AI Code Generation

1using AppUIBasics.Common;2using Windows.UI.Xaml.Controls;3using Windows.UI.Xaml.Navigation;4{5    {6        private NavigationHelper navigationHelper;7        public Scenario4()8        {9            this.InitializeComponent();10            navigationHelper = new NavigationHelper(this);11            navigationHelper.SaveState += navigationHelper_SaveState;12        }13        void navigationHelper_SaveState(object sender, SaveStateEventArgs e)14        {

SaveStateEventHandler

Using AI Code Generation

1{2    private NavigationHelper navigationHelper;3    public MainPage()4    {5        this.InitializeComponent();6        this.navigationHelper = new NavigationHelper(this);7        this.navigationHelper.LoadState += this.NavigationHelper_LoadState;8        this.navigationHelper.SaveState += this.NavigationHelper_SaveState;9    }10    private void NavigationHelper_LoadState(object sender, LoadStateEventArgs e)11    {

SaveStateEventHandler

Using AI Code Generation

1protected override void OnNavigatedFrom(NavigationEventArgs e)2{3    navigationHelper.OnNavigatedFrom(e);4}5protected override void OnNavigatedTo(NavigationEventArgs e)6{7    navigationHelper.OnNavigatedTo(e);8}9private void NavigationHelper_SaveState(object sender, SaveStateEventArgs e)10{11}12private void NavigationHelper_LoadState(object sender, LoadStateEventArgs e)13{14}15private void BackButton_Click(object sender, RoutedEventArgs e)16{17    if (navigationHelper.CanGoBack())18    {19        navigationHelper.GoBack();20    }21}22private void ForwardButton_Click(object sender, RoutedEventArgs e)23{24    if (navigationHelper.CanGoForward())25    {26        navigationHelper.GoForward();27    }28}29private void NavigationHelper_LoadState(object sender, LoadStateEventArgs e)30{

SaveStateEventHandler

Using AI Code Generation

1protected override void OnNavigatedTo(NavigationEventArgs e)2{3    navigationHelper.OnNavigatedTo(e);4}5protected override void OnNavigatedFrom(NavigationEventArgs e)6{7    navigationHelper.OnNavigatedFrom(e);8}9private void navigationHelper_LoadState(object sender, LoadStateEventArgs e)10{11    if (e.PageState != null && e.PageState.ContainsKey("SelectedItem"))12    {13        var selectedItem = (SampleDataItem)e.PageState["SelectedItem"];14        navigationHelper.GoBackCommand.RaiseCanExecuteChanged();15    }16}17private void navigationHelper_SaveState(object sender, SaveStateEventArgs e)18{19    e.PageState["SelectedItem"] = 0;20}21private void navigationHelper_LoadState(object sender, LoadStateEventArgs e)22{23    if (e.PageState != null && e.PageState.ContainsKey("SelectedItem"))24    {25        var selectedItem = (SampleDataItem)e.PageState["SelectedItem"];26        navigationHelper.GoBackCommand.RaiseCanExecuteChanged();27    }28}29private void navigationHelper_SaveState(object sender, SaveStateEventArgs e)30{31    e.PageState["SelectedItem"] = 0;32}33private void navigationHelper_LoadState(object sender, LoadStateEventArgs e)34{35    if (e.PageState != null && e.PageState.ContainsKey("SelectedItem"))36    {37        var selectedItem = (SampleDataItem)e.PageState["SelectedItem"];38        navigationHelper.GoBackCommand.RaiseCanExecuteChanged();39    }40}

SaveStateEventHandler

Using AI Code Generation

1{2    private readonly NavigationHelper navigationHelper;3    private readonly ObservableDictionary defaultViewModel = new ObservableDictionary();4    public SplitPage()5    {6        this.InitializeComponent();7        this.navigationHelper = new NavigationHelper(this);8        this.navigationHelper.LoadState += navigationHelper_LoadState;9        this.navigationHelper.SaveState += navigationHelper_SaveState;10    }11    {12        get { return this.navigationHelper; }13    }14    {15        get { return this.defaultViewModel; }16    }17    private void navigationHelper_LoadState(object sender, LoadStateEventArgs e)18    {

SaveStateEventHandler

Using AI Code Generation

1protected override void OnNavigatedFrom(NavigationEventArgs e)2{3    base.OnNavigatedFrom(e);4    navigationHelper.OnNavigatedFrom(e);5}6protected override void OnNavigatedTo(NavigationEventArgs e)7{8    base.OnNavigatedTo(e);9    navigationHelper.OnNavigatedTo(e);10}11protected override void OnNavigatedFrom(NavigationEventArgs e)12{13    base.OnNavigatedFrom(e);14    navigationHelper.OnNavigatedFrom(e);15}16protected override void OnNavigatedTo(NavigationEventArgs e)17{18    base.OnNavigatedTo(e);19    navigationHelper.OnNavigatedTo(e);20}21protected override void OnNavigatedFrom(NavigationEventArgs e)22{23    base.OnNavigatedFrom(e);24    navigationHelper.OnNavigatedFrom(e);25}26protected override void OnNavigatedTo(NavigationEventArgs e)27{28    base.OnNavigatedTo(e);29    navigationHelper.OnNavigatedTo(e);30}31protected override void OnNavigatedFrom(NavigationEventArgs e)32{33    base.OnNavigatedFrom(e);34    navigationHelper.OnNavigatedFrom(e);35}36protected override void OnNavigatedTo(NavigationEventArgs e)37{38    base.OnNavigatedTo(e);39    navigationHelper.OnNavigatedTo(e);40}41protected override void OnNavigatedFrom(NavigationEventArgs e)42{43    base.OnNavigatedFrom(e);44    navigationHelper.OnNavigatedFrom(e);45}46protected override void OnNavigatedTo(NavigationEventArgs e)47{48    base.OnNavigatedTo(e);49    navigationHelper.OnNavigatedTo(e);50}

SaveStateEventHandler

Using AI Code Generation

1using AppUIBasics.Common;2using AppUIBasics.Data;3using AppUIBasics.ViewModels;4using Windows.UI.Xaml.Controls;5using Windows.UI.Xaml.Navigation;6{7    {8        private NavigationHelper navigationHelper;9        private ObservableDictionary defaultViewModel = new ObservableDictionary();10        public ItemPage()11        {12            this.InitializeComponent();13            this.navigationHelper = new NavigationHelper(this);14            this.navigationHelper.LoadState += navigationHelper_LoadState;15            this.navigationHelper.SaveState += navigationHelper_SaveState;16        }17        {18            get { return this.defaultViewModel; }19        }20        {21            get { return this.navigationHelper; }22        }23        private void navigationHelper_LoadState(object sender, LoadStateEventArgs e)24        {

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