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

Best WinAppDriver code snippet using AppUIBasics.Common.RootFrameNavigationHelper.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 System;2using System.Collections.Generic;3using System.IO;4using System.Linq;5using System.Runtime.InteropServices.WindowsRuntime;6using Windows.ApplicationModel;7using Windows.ApplicationModel.Activation;8using Windows.Foundation;9using Windows.Foundation.Collections;10using Windows.UI.Xaml;11using Windows.UI.Xaml.Controls;12using Windows.UI.Xaml.Controls.Primitive;13using Windows.UI.Xaml.Data;14using Windows.UI.Xaml.Input;15using Windows.UI.Xaml.Media;16using Windows.UI.Xaml.Navigation;17{18    {19        private TransitionCollection transitions;20        public App()21        {22            this.InitializeComponent();23            this.Suspending += OnSuspending;24        }25        protected override void OnLaunched(LaunchActivatedEventArgs e)26        {27            if (System.Diagnostics.Debugger.IsAttached)28            {29                this.DebugSettings.EnableFrameRateCounter = true;30            }31            Frame rootFrame = Window.Current.Content as Frame;32            if (rootFrame == null)33            {34                rootFrame = new Frame();

SaveStateEventHandler

Using AI Code Generation

1using AppUIBasics.Common;2using AppUIBasics.Data;3using AppUIBasics.ViewModels;4using Windows.UI.Xaml;5using Windows.UI.Xaml.Controls;6using Windows.UI.Xaml.Navigation;7{8    {9        private static App _instance;10        private Frame _rootFrame;11        private object _currentPage;12        private Type _currentPageType;13        private object _currentPageParam;14        private Dictionary<string, object> _currentPageState;15        private Dictionary<string, object> _currentPageStateCopy;16        private Dictionary<string, object> _currentPageStateCopy2;17        private Dictionary<string, object> _currentPageStateCopy3;18        private Dictionary<string, object> _currentPageStateCopy4;

SaveStateEventHandler

Using AI Code Generation

1using System;2using System.Collections.Generic;3using System.IO;4using System.Linq;5using System.Runtime.InteropServices.WindowsRuntime;6using Windows.Foundation;7using Windows.Foundation.Collections;8using Windows.UI.Xaml;9using Windows.UI.Xaml.Controls;10using Windows.UI.Xaml.Controls.Primitive;11using Windows.UI.Xaml.Data;12using Windows.UI.Xaml.Input;13using Windows.UI.Xaml.Media;14using Windows.UI.Xaml.Navigation;

SaveStateEventHandler

Using AI Code Generation

1private void OnNavigatedTo(NavigationEventArgs e)2{3    var rootFrameNavigationHelper = AppUIBasics.Common.RootFrameNavigationHelper.Current;4    rootFrameNavigationHelper.SaveStateEventHandler += SaveState;5    var rootFrameNavigationHelper = AppUIBasics.Common.RootFrameNavigationHelper.Current;6    rootFrameNavigationHelper.LoadStateEventHandler += LoadState;7}8private void OnNavigatedFrom(NavigationEventArgs e)9{10    var rootFrameNavigationHelper = AppUIBasics.Common.RootFrameNavigationHelper.Current;11    rootFrameNavigationHelper.SaveStateEventHandler -= SaveState;12    var rootFrameNavigationHelper = AppUIBasics.Common.RootFrameNavigationHelper.Current;13    rootFrameNavigationHelper.LoadStateEventHandler -= LoadState;14}15private void SaveState(object sender, SaveStateEventArgs e)16{17}18private void LoadState(object sender, LoadStateEventArgs e)19{20}21protected override void OnNavigatedTo(NavigationEventArgs e)22{23    base.OnNavigatedTo(e);24    var rootFrameNavigationHelper = AppUIBasics.Common.RootFrameNavigationHelper.Current;25    rootFrameNavigationHelper.SaveStateEventHandler += SaveState;26    var rootFrameNavigationHelper = AppUIBasics.Common.RootFrameNavigationHelper.Current;27    rootFrameNavigationHelper.LoadStateEventHandler += LoadState;28}29protected override void OnNavigatedFrom(NavigationEventArgs e)30{31    base.OnNavigatedFrom(e);32    var rootFrameNavigationHelper = AppUIBasics.Common.RootFrameNavigationHelper.Current;

SaveStateEventHandler

Using AI Code Generation

1using System;2using System.Collections.Generic;3using System.IO;4using System.Linq;5using System.Runtime.InteropServices.WindowsRuntime;6using Windows.Foundation;7using Windows.Foundation.Collections;8using Windows.UI.Xaml;9using Windows.UI.Xaml.Controls;10using Windows.UI.Xaml.Controls.Primitives;11using Windows.UI.Xaml.Data;12using Windows.UI.Xaml.Input;13using Windows.UI.Xaml.Media;14using Windows.UI.Xaml.Navigation;15{16    {17        public Page4()18        {19            this.InitializeComponent();20            this.NavigationCacheMode = NavigationCacheMode.Required;21        }22        protected override void OnNavigatedTo(NavigationEventArgs e)23        {

SaveStateEventHandler

Using AI Code Generation

1RootFrameNavigationHelper.SaveStateEventHandler += SaveState;2RootFrameNavigationHelper.SaveStateEventHandler -= SaveState;3RootFrameNavigationHelper.SaveStateEventHandler += SaveState;4RootFrameNavigationHelper.SaveStateEventHandler -= SaveState;5RootFrameNavigationHelper.RestoreStateEventHandler += RestoreState;6RootFrameNavigationHelper.RestoreStateEventHandler -= RestoreState;7RootFrameNavigationHelper.RestoreStateEventHandler += RestoreState;8RootFrameNavigationHelper.RestoreStateEventHandler -= RestoreState;9RootFrameNavigationHelper.SaveStateEventHandler += SaveState;10RootFrameNavigationHelper.SaveStateEventHandler -= SaveState;11RootFrameNavigationHelper.RestoreStateEventHandler += RestoreState;12RootFrameNavigationHelper.RestoreStateEventHandler -= RestoreState;

SaveStateEventHandler

Using AI Code Generation

1using  System;2 using  System.Collections.Generic;3 using  System.IO;4 using  System.Linq;5 using  Windows.Foundation;6 using  Windows.Foundation.Collections;7 using  Windows.UI.Xaml;8 using  Windows.UI.Xaml.Controls;9 using  Windows.UI.Xaml.Controls.Primitives;10 using  Windows.UI.Xaml.Data;11 using  Windows.UI.Xaml.Input;12 using  Windows.UI.Xaml.Media;13 using  Windows.UI.Xaml.Navigation;14 using  AppUIBasics.Common;15 using  AppUIBasics.Data;16{17    {18         public  Scenario4()19        {20            this.InitializeComponent();21        }22         protected   override   void  LoadState(Object navigationParameter, Dictionary< string , Object> pageState)23        {

SaveStateEventHandler

Using AI Code Generation

1using System;2using System.Collections.Generic;3using System.IO;4using System.Linq;5using Windows.Foundation;6using Windows.Foundation.Collections;7using Windows.UI.Xaml;8using Windows.UI.Xaml.Controls;9using Windows.UI.Xaml.Controls.Primitives;10using Windows.UI.Xaml.Data;11using Windows.UI.Xaml.Input;12using Windows.UI.Xaml.Media;13using Windows.UI.Xaml.Navigation;14using AppUIBasics.Common;15{16    {17        public Page4()18        {19            this.InitializeComponent();20        }21        protected override void LoadState(Object navigationParameter, Dictionary<String, Object> pageState)22        {23            if (pageState != null && pageState.ContainsKey("Page4State"))24            {25                string state = pageState["Page4State"].ToString();26                if (state != null)27                {28                    textBlock.Text = state;29                }30            }31        }32        protected override void SaveState(Dictionary<String, Object> pageState)33        {34            pageState["Page4State"] = textBlock.Text;35        }36        private void button_Click(object sender, RoutedEventArgs e)37        {38            textBlock.Text = "This is a sample app to demonstrate the use of the Windows 8.1 XAML Controls";39        }40    }41}

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