protected override void OnNavigatingFrom(NavigatingCancelEventArgs e)
{
// Before we navigate away from the page, we want to generate a new _persistedPosition string. This string contains the key of the item at the top of the
// viewing window (generated by the function GetKey) and the offset of that item.
RestoreScrollPositionSample._persistedPosition = ListViewPersistenceHelper.GetRelativeScrollPosition(this.ItemsListView, this.GetKey);
base.OnNavigatingFrom(e);
}
protected override void OnNavigatingFrom(NavigatingCancelEventArgs e)
{
_persistedPosition = ListViewPersistenceHelper.GetRelativeScrollPosition(itemGridView, GetKey);
base.OnNavigatingFrom(e);
if (e.Cancel)
{
return;
}
if (e.NavigationMode == NavigationMode.Back)
{
_persistedPosition = null;
var animation = ConnectedAnimationService.GetForCurrentView()
.PrepareToAnimate(CONNECTED_ANIMATION_HOSTED_CONFIG_NAME, hostedConfigNameTextBlock);
if (ApiInformation.IsTypePresent("Windows.UI.Xaml.Media.Animation.DirectConnectedAnimationConfiguration"))
{
animation.Configuration = new DirectConnectedAnimationConfiguration();
}
}
}
private void PersistControlsState()
{
try
{
TempSettingsUtils.Set(Constants.TEMP_PIVOT_STATE, MainPivot.SelectedIndex);
if (this.SurahListView.ItemsPanelRoot != null)
{
TempSettingsUtils.Set(Constants.TEMP_SURAH_LIST_STATE, ListViewPersistenceHelper.GetRelativeScrollPosition(this.SurahListView, this.GetKeyFromListView));
}
if (this.JuzListView.ItemsPanelRoot != null)
{
TempSettingsUtils.Set(Constants.TEMP_JUZ_LIST_STATE, ListViewPersistenceHelper.GetRelativeScrollPosition(this.JuzListView, this.GetKeyFromListView));
}
}
catch (Exception ex)
{
telemetry.TrackException(ex, new Dictionary <string, string> {
{ "Scenario", "PersistControlsState" }
});
}
}
public String GetState(Func <Object, String> itemToKeyFunction)
{
var itemToKeyHandler = (ListViewItemToKeyHandler)((item) => itemToKeyFunction.Invoke(item));
return(ListViewPersistenceHelper.GetRelativeScrollPosition(this, itemToKeyHandler));
}
private void SaveScrollPosition()
{
// We let the item be its own key. In a more general program, the item would have
// a unique ID that identifies it in the list.
this.savedScrollPosition = ListViewPersistenceHelper.GetRelativeScrollPosition(BottomUpList, (o) => o.ToString());
}
protected override void OnNavigatingFrom(NavigatingCancelEventArgs e)
{
_persistedPosition = ListViewPersistenceHelper.GetRelativeScrollPosition(DuanListView, GetKey);
base.OnNavigatingFrom(e);
}