private async void GridViewPages_Loaded(object sender, RoutedEventArgs e)
{
await RunOnUIThreadAsync(CoreDispatcherPriority.High, () =>
{
if (GridViewPages.Items.Count >= 1)
{
int index = ViewModel.SelectedPageIndex;
// fix GridView initially fails to select item by binding
GridViewPages.SelectedIndex = index;
// try scroll to selected item
try
{
GridViewItem item = (GridViewItem)GridViewPages.ContainerFromIndex(index);
Guard.IsNotNull(item, nameof(item));
BringIntoViewOptions options = new BringIntoViewOptions
{
AnimationDesired = false,
};
item.StartBringIntoView(options);
}
catch (Exception exc)
{
ViewModel.AppCenterService.TrackError(exc);
}
}
});
}
private async void GridViewPages_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
await RunOnUIThreadAsync(CoreDispatcherPriority.Normal, () =>
{
if (GridViewPages.SelectionMode == ListViewSelectionMode.Single &&
e.AddedItems != null & e.AddedItems.Count != 0)
{
// select page in view model
ViewModel.SelectedPageIndex = GridViewPages.SelectedIndex;
// scroll to newly selected item
try
{
GridViewItem item = (GridViewItem)GridViewPages.ContainerFromItem(e.AddedItems[0]);
BringIntoViewOptions options = new BringIntoViewOptions
{
AnimationDesired = true,
};
item.StartBringIntoView(options);
}
catch (Exception)
{
}
}
else if (GridViewPages.SelectionMode == ListViewSelectionMode.Single)
{
try
{
GridViewPages.SelectedIndex = ViewModel.SelectedPageIndex;
}
catch (Exception) { }
}
else if (GridViewPages.SelectionMode != ListViewSelectionMode.Single)
{
// connect items to view model
if (GridViewPages.SelectedRanges.Count == 0)
{
ViewModel.SelectedRanges = null;
}
else
{
ViewModel.SelectedRanges = GridViewPages.SelectedRanges;
}
// select last selected item in view model
if (e.AddedItems != null && e.AddedItems.Count != 0)
{
int index = GridViewPages.Items.IndexOf(e.AddedItems[e.AddedItems.Count - 1]);
ViewModel.SelectedPageIndex = index;
}
}
});
}
public void LlenarGridPaginas(IList <Pagina> paginas)
{
GridViewPages.DataSource = paginas;
GridViewPages.DataBind();
}
