/// <summary>
/// Invoked when this page will no longer be displayed in a Frame.
/// This method calls <see cref="SaveState"/>, where all page specific
/// navigation and process lifetime management logic should be placed.
/// </summary>
/// <param name="e">Event data that describes how this page was reached. The Parameter
/// property provides the group to be displayed.</param>
public void OnNavigatedFrom(NavigationEventArgs e)
{
var frameState = SuspensionManager.SessionStateForFrame(this.Frame);
var pageState = new Dictionary <String, Object>();
if (this.SaveState != null)
{
this.SaveState(this, new SaveStateEventArgs(pageState));
}
frameState[_pageKey] = pageState;
}
/// <summary>
/// Invoked when this page will no longer be displayed in a Frame.
/// </summary>
/// <param name="e">Event data that describes how this page was reached. The Parameter
/// property provides the group to be displayed.</param>
protected override void OnNavigatedFrom(NavigationEventArgs e)
{
try
{
var frameState = SuspensionManager.SessionStateForFrame(this.Frame);
var pageState = new Dictionary <string, object>();
this.SaveState(e, pageState);
frameState[_pageKey] = pageState;
}
catch (Exception ex)
{
}
}
protected override void OnNavigatedFrom(NavigationEventArgs e)
{
base.OnNavigatedFrom(e);
var frameState = SuspensionManager.SessionStateForFrame(this.Frame);
var pageState = new Dictionary <String, Object>();
if (this.SaveState != null)
{
this.SaveState(this, new SaveStateEventArgs(pageState));
}
frameState[_pageKey] = pageState;
currentView.BackRequested -= SystemNavigationManager_BackRequested;
}
private void CurrentGalleryPage_Loaded(object sender, RoutedEventArgs e)
{
var currentState = GetCurrentState("WidthStates");
if (currentState == Width560Height0 || currentState == Width700)
{
// Left
isLeft = true;
}
else
{
// Bottom
isLeft = false;
}
UpdateDetailPanelState(true);
try
{
// Jump to the page item if this is a back button action
if (this.Frame.CanGoForward)
{
var frameState = SuspensionManager.SessionStateForFrame(this.Frame);
var lastPageParameters = frameState["Page-" + (this.Frame.BackStackDepth + 1)] as IDictionary <string, object>;
var index = (int)lastPageParameters["Page"];
// Scroll into the index of last opened page
ItemsWrapPanel.ScrollIntoView((ItemsWrapPanel.ItemsSource as IList)[index], ScrollIntoViewAlignment.Default);
ItemsWrapPanel.UpdateLayout();
// Start the animation
ConnectedAnimation animation = ConnectedAnimationService.GetForCurrentView().GetAnimation("ThumbImage");
if (animation != null)
{
if (ItemsWrapPanel.ContainerFromIndex(index) is ContentControl container)
{
var root = (FrameworkElement)container.ContentTemplateRoot;
var image = (UIElement)root.FindName("ThumbImage");
animation.TryStart(image);
}
}
}
}
catch (Exception ex)
{
}
}
protected override void OnNavigatedTo(Windows.UI.Xaml.Navigation.NavigationEventArgs e)
{
base.OnNavigatedTo(e);
var frameState = SuspensionManager.SessionStateForFrame(this.Frame);
this._pageKey = "Page-" + this.Frame.BackStackDepth;
if (e.NavigationMode == NavigationMode.New)
{
// Clear existing state for forward navigation when adding a new page to the
// navigation stack
var nextPageKey = this._pageKey;
int nextPageIndex = this.Frame.BackStackDepth;
while (frameState.Remove(nextPageKey))
{
nextPageIndex++;
nextPageKey = "Page-" + nextPageIndex;
}
// Pass the navigation parameter to the new page
if (this.LoadState != null)
{
this.LoadState(this, new LoadStateEventArgs(e.Parameter, null));
}
}
else
{
// Pass the navigation parameter and preserved page state to the page, using
// the same strategy for loading suspended state and recreating pages discarded
// from cache
if (this.LoadState != null)
{
this.LoadState(this, new LoadStateEventArgs(e.Parameter, (Dictionary <String, Object>)frameState[this._pageKey]));
}
}
currentView = SystemNavigationManager.GetForCurrentView();
if (!ApiInformation.IsTypePresent("Windows.Phone.UI.Input.HardwareButtons"))
{
currentView.AppViewBackButtonVisibility = this.Frame.CanGoBack ? AppViewBackButtonVisibility.Visible : AppViewBackButtonVisibility.Collapsed;
}
currentView.BackRequested += SystemNavigationManager_BackRequested;
}
/// <summary>
/// Handles the page serializing.
/// </summary>
/// <param name="navigable">The navigator view model.</param>
/// <param name="e">The <see cref="Windows.UI.Xaml.Navigation.NavigationEventArgs" /> instance
/// containing the event data.</param>
private Task HandleSerializing(INavigable navigable)
{
var tombstone = navigable as ITombstone;
if (tombstone != null)
{
var frameState = SuspensionManager.SessionStateForFrame(this.Frame);
var pageState = new Dictionary <String, Object>();
return(tombstone.OnSerializingAsync(pageState).ContinueWith(delegate
{
frameState[this.pageKey] = pageState;
}));
}
return(Task.CompletedTask);
}
protected override async void OnNavigatedFrom(NavigationEventArgs e)
{
base.OnNavigatedFrom(e);
this.IsInView = false;
// User left the app, wire up the resuming event in case they come back and we can restore any custom state necessary
if (e.NavigationMode == NavigationMode.Forward)
{
Windows.UI.Xaml.Application.Current.Resuming += Application_Resuming;
}
try
{
// Remove the view model instance from the frame's datacontext
this.Frame.DataContext = null;
PlatformBase.CurrentCore.Logger.Log(LogLevels.Information, "OnNavigatedFrom: {0}\t Mode: {1}", e.SourcePageType.Name, e.NavigationMode);
// Intialize page state for this page within the current frame
var frameState = SuspensionManager.SessionStateForFrame(this.Frame);
var pageState = new Dictionary <string, object>();
// Wrapper object for all the navigated from event data and session state
var args = new SaveStateEventArgs(e, pageState);
// Pass navigation event data on to the ViewModel
if (this.ViewModel != null)
{
await this.ViewModel.SaveStateAsync(args);
}
// Pass navigation event data back to the page so that it has a chance to do any custom logic with access to the page state dictionary.
await this.OnSaveStateAsync(args);
// Save session state for the page
frameState[_pageKey] = pageState;
this.TeardownInterstitialAds();
}
catch (Exception ex)
{
PlatformBase.CurrentCore.Logger.LogError(ex, "Error during {0}.OnNavigatedFrom: {1} Parameter: {2}", e.SourcePageType.Name, e.NavigationMode, e.Parameter);
throw ex;
}
}
/// <summary>
/// Navigation To
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
void Frame_Navigated(object sender, NavigationEventArgs e)
{
var naviArgs = new NavigationArgs
{
Content = e.Content,
NavigationMode =
(Models.NavigationMode)Enum.Parse(typeof(Models.NavigationMode), e.NavigationMode.ToString()),
Parameter = e.Parameter,
Uri = e.Uri
};
//프레임의 세션 스테이트 값 복구
var frameState = SuspensionManager.SessionStateForFrame(_frame);
var pageKey = PAGE + _frame.BackStackDepth;
if (naviArgs.NavigationMode == Models.NavigationMode.New)
{
// Clear existing state for forward navigation when adding a new page to the
// navigation stack
var nextPageKey = pageKey;
var nextPageIndex = _frame.BackStackDepth;
while (frameState.Remove(nextPageKey))
{
nextPageIndex++;
nextPageKey = PAGE + nextPageIndex;
}
_frameSessionState = new Dictionary <string, object>();
frameState[pageKey] = _frameSessionState;
}
else
{
_frameSessionState = (Dictionary <String, Object>)frameState[pageKey];
}
if (StaticFunctions.BaseContext != null)
{
StaticFunctions.InvokeIfRequiredAsync(StaticFunctions.BaseContext,
para => _eventAggregator.GetEvent <NavigatedEvent>().Publish(naviArgs), null);
}
else
{
_eventAggregator.GetEvent <NavigatedEvent>().Publish(naviArgs);
}
}
/// <summary>
/// Invoked when this page is about to be displayed in a Frame.
/// </summary>
/// <param name="e">Event data that describes how this page was reached. The Parameter
/// property provides the group to be displayed.</param>
protected override void OnNavigatedTo(NavigationEventArgs e)
{
// Returning to a cached page through navigation shouldn't trigger state loading
if (this._pageKey != null)
{
return;
}
var frameState = SuspensionManager.SessionStateForFrame(this.Frame);
this._pageKey = "Page-" + this.Frame.BackStackDepth;
if (e.NavigationMode == NavigationMode.New)
{
// Clear existing state for forward navigation when adding a new page to the
// navigation stack
var nextPageKey = this._pageKey;
int nextPageIndex = this.Frame.BackStackDepth;
while (frameState.Remove(nextPageKey))
{
nextPageIndex++;
nextPageKey = "Page-" + nextPageIndex;
}
// Pass the navigation parameter to the new page
this.LoadState(e.Parameter, null);
}
else
{
// Pass the navigation parameter and preserved page state to the page, using
// the same strategy for loading suspended state and recreating pages discarded
// from cache
this.LoadState(e.Parameter, (Dictionary <String, Object>)frameState[this._pageKey]);
}
// activate...
var model = this.GetModel();
if (model != null)
{
model.Activated();
}
}
/// <summary>
/// 恢复数据
/// </summary>
/// <param name="e"></param>
protected override void OnNavigatedTo(NavigationEventArgs e)
{
base.OnNavigatedTo(e);
if (e.NavigationMode == NavigationMode.New)
{
}
else
{
var frameState = SuspensionManager.SessionStateForFrame(this.Frame);
var _pageKey = "Page-" + this.GetType().ToString();
var data = (Dictionary <String, Object>)frameState[_pageKey];
if (data != null && data.ContainsKey(nameof(txtInput)))
{
txtInput.Text = data[nameof(txtInput)].ToString();
}
}
}
private void Page_Loaded(object sender, RoutedEventArgs e)
{
// Rstore GridView's scroll position.
gridScrollViewer = FindVisualChild <ScrollViewer>(CustomerGridView);
var frameState = SuspensionManager.SessionStateForFrame(this.Frame);
if (frameState.Count > 0)
{
Dictionary <String, Object> pos;
if (frameState.ContainsKey("Page-" + (Frame.BackStackDepth - 2)))
{
pos = frameState["Page-" + (Frame.BackStackDepth - 2)] as Dictionary <String, Object>;
if (pos.ContainsKey("ScrollPosition"))
{
gridScrollViewer.ChangeView(0.0f, (double)pos["ScrollPosition"], 1.0f);
}
}
}
}
/// <summary>
/// Handles the page deserializing.
/// </summary>
/// <param name="navigable">The navigator view model.</param>
private bool HandleDeserializing(INavigable navigable, NavigationEventArgs e, Task navigatedTask)
{
var frameState = SuspensionManager.SessionStateForFrame(this.Frame);
this.pageKey = "Page-" + this.Frame.BackStackDepth;
if (e.NavigationMode == NavigationMode.New)
{
// Clear existing state for forward navigation when adding a new page to the navigation stack
var nextPageKey = this.pageKey;
int nextPageIndex = this.Frame.BackStackDepth;
while (frameState.Remove(nextPageKey))
{
nextPageIndex++;
nextPageKey = "Page-" + nextPageIndex;
}
}
else
{
var tombstone = navigable as ITombstone;
if (tombstone != null)
{
// Pass the navigation parameter and preserved page state to the page, using the same strategy
// for loading suspended state and recreating pages discarded from cache
var state = (Dictionary <string, object>)frameState[this.pageKey];
var hasState = state.Any();
if (hasState)
{
RunAfter(navigatedTask, () => tombstone.OnDeserializingAsync(state));
}
return(hasState);
}
}
// New page, no state, or no support for managing state
return(false);
}
/// <summary>
/// Invoked when this page is about to be displayed in a Frame.
/// This method calls <see cref="LoadState" />, where all page specific
/// navigation and process lifetime management logic should be placed.
/// </summary>
/// <param name="e">
/// Event data that describes how this page was reached. The Parameter
/// property provides the group to be displayed.
/// </param>
public void OnNavigatedTo(NavigationEventArgs e)
{
var frameState = SuspensionManager.SessionStateForFrame(Frame);
_pageKey = "Page-" + Frame.BackStackDepth;
if (e.NavigationMode == NavigationMode.New)
{
// Clear existing state for forward navigation when adding a new page to the
// navigation stack
var nextPageKey = _pageKey;
var nextPageIndex = Frame.BackStackDepth;
while (frameState.Remove(nextPageKey))
{
nextPageIndex++;
nextPageKey = "Page-" + nextPageIndex;
}
// Pass the navigation parameter to the new page
if (LoadState != null)
{
LoadState(this, new LoadStateEventArgs(e.Parameter, null));
}
}
else
{
// Pass the navigation parameter and preserved page state to the page, using
// the same strategy for loading suspended state and recreating pages discarded
// from cache
if (LoadState != null)
{
LoadState(this,
new LoadStateEventArgs(e.Parameter, (Dictionary <string, object>)frameState[_pageKey]));
}
}
}
private void Page_Loaded(object sender, RoutedEventArgs e)
{
try
{
// Jump to the page item if this is a back button action
if (this.Frame.CanGoForward)
{
var frameState = SuspensionManager.SessionStateForFrame(this.Frame);
var lastPageParameters = frameState["Page-" + (this.Frame.BackStackDepth + 1)] as IDictionary <string, object>;
var index = (int)lastPageParameters["Index"];
var postId = (int)lastPageParameters["PostId"];
if (this.HomeViewModel.SelectedViewIndex == 0)
{
// Pre-fall creator has different image loading order
// unable to share same connected animation code without breaking the UI
if (ApiInformation.IsApiContractPresent("Windows.Foundation.UniversalApiContract", 5))
{
var post = FeatureView.FeatureViewModel.TopToday.First(o => o.Id == postId);
if (post != null && FeatureView.FeatureViewModel.TopToday.IndexOf(post) != -1)
{
// Start the animation
ConnectedAnimation animation = ConnectedAnimationService.GetForCurrentView().GetAnimation("PreviewImage");
if (animation != null)
{
FeatureView.UpdateLayout();
animation.TryStart(this.FeatureView.GetTopTodayButton(FeatureView.FeatureViewModel.TopToday.IndexOf(post)));
}
}
}
}
else if (this.HomeViewModel.SelectedViewIndex == 1 || this.HomeViewModel.SelectedViewIndex == 2)
{
JustifiedWrapPanel panel = null;
if (this.HomeViewModel.SelectedViewIndex == 1)
{
// Navigating back from a search result image
panel = BrowsePanel;
}
else if (this.HomeViewModel.SelectedViewIndex == 2)
{
// Navigating back from a favorite image
panel = FavoritePanel;
}
// Scroll into the index of last opened page
panel.ScrollIntoView((panel.ItemsSource as IList)[index], ScrollIntoViewAlignment.Default);
panel.UpdateLayout();
// Pre-fall creator has different image loading order
// unable to share same connected animation code without breaking the UI
if (ApiInformation.IsApiContractPresent("Windows.Foundation.UniversalApiContract", 5))
{
// Start the animation
ConnectedAnimation animation = ConnectedAnimationService.GetForCurrentView().GetAnimation("PreviewImage");
if (animation != null)
{
if (panel.ContainerFromIndex(index) is ContentControl container)
{
var root = (FrameworkElement)container.ContentTemplateRoot;
var image = (UIElement)root.FindName("PreviewImage");
animation.TryStart(image);
}
}
}
}
}
}
catch (Exception ex)
{
}
}
/// <summary>
/// The methods provided in this section are simply used to allow
/// NavigationHelper to respond to the page's navigation methods.
/// <para>
/// Page specific logic should be placed in event handlers for the
/// <see cref="NavigationHelper.LoadState"/>
/// and <see cref="NavigationHelper.SaveState"/>.
/// The navigation parameter is available in the LoadState method
/// in addition to page state preserved during an earlier session.
/// </para>
/// </summary>
/// <param name="e">Event data that describes how this page was reached.</param>
protected override async void OnNavigatedTo(NavigationEventArgs e)
{
base.OnNavigatedTo(e);
this.IsInView = true;
try
{
// Set the datacontext of the frame so that it can appropriately show the busy panel or not when a view model requests it
this.Frame.DataContext = this.ViewModel;
Platform.Current.Logger.Log(LogLevels.Warning, "OnNavigatedTo: {0}\t Mode: {1}\t Parameter: {2}", e.SourcePageType.Name, e.NavigationMode, e.Parameter);
// Chck for data in session state
Dictionary <string, Object> dic = null;
var frameState = SuspensionManager.SessionStateForFrame(this.Frame);
_pageKey = "Page-" + this.Frame.BackStackDepth;
if (e.NavigationMode == NavigationMode.New)
{
// Clear existing state for forward navigation when adding a new page to the
// navigation stack
var nextPageKey = _pageKey;
int nextPageIndex = this.Frame.BackStackDepth;
while (frameState.Remove(nextPageKey))
{
nextPageIndex++;
nextPageKey = "Page-" + nextPageIndex;
}
// Pass the navigation parameter to the new page
dic = new Dictionary <string, object>();
}
else
{
// Pass the navigation parameter and preserved page state to the page, using
// the same strategy for loading suspended state and recreating pages discarded
// from cache
if (frameState.ContainsKey(_pageKey))
{
dic = (Dictionary <string, object>)frameState[_pageKey];
}
else
{
dic = new Dictionary <string, object>();
}
}
// Wrapper object for all the navigated to event data and session state
var args = new LoadStateEventArgs(e, dic, _isInitialized);
// Pass navigation event data back to the page so that it has a chance to do any custom logic with access to the page state dictionary.
await this.OnLoadStateAsync(args);
// Pass navigation event data on to the ViewModel
if (this.ViewModel != null)
{
await this.ViewModel.LoadStateAsync(this, args);
}
}
catch (Exception ex)
{
Platform.Current.Logger.LogError(ex, "Error during {0}.OnNavigatedTo: {1} Parameter: {2}", e.SourcePageType.Name, e.NavigationMode, e.Parameter);
throw ex;
}
finally
{
_isInitialized = true;
}
}
