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 void BtnStartBringIntoView_Click(object sender, RoutedEventArgs e)
{
try
{
txtInnerStockOffsetsChangeDuration.Text = string.Empty;
txtOuterStockOffsetsChangeDuration.Text = string.Empty;
FrameworkElement targetElement = null;
ItemsRepeater repeater = null;
switch (cmbNestingCombination.SelectedIndex)
{
case 0: //ScrollerInScroller
repeater = repeater1;
break;
case 1: //ScrollerInScrollViewer
repeater = repeater2;
break;
case 2: //ScrollViewerInScroller
repeater = repeater3;
break;
}
Border border = repeater.TryGetElement(Convert.ToInt16(txtTargetElement.Text)) as Border;
if (border != null)
{
targetElement = border.Child as FrameworkElement;
if (targetElement != null)
{
BringIntoViewOptions options = new BringIntoViewOptions();
options.AnimationDesired = cmbAnimationDesired.SelectedIndex == 0;
options.HorizontalAlignmentRatio = Convert.ToDouble(txtHorizontalAlignmentRatio.Text);
options.VerticalAlignmentRatio = Convert.ToDouble(txtVerticalAlignmentRatio.Text);
options.HorizontalOffset = Convert.ToDouble(txtHorizontalOffset.Text);
options.VerticalOffset = Convert.ToDouble(txtVerticalOffset.Text);
if (chkLogBringIntoViewRequestedEvents.IsChecked == true)
{
AppendAsyncEventMessage("Invoking StartBringIntoView on " + targetElement.Name);
}
targetElement.StartBringIntoView(options);
}
}
if (targetElement == null && chkLogBringIntoViewRequestedEvents.IsChecked == true)
{
AppendAsyncEventMessage("TargetElement not found");
}
}
catch (Exception ex)
{
txtExceptionReport.Text = ex.ToString();
lstScrollerEvents.Items.Add(ex.ToString());
}
}
/// <summary>
/// Initiates a request to the XAML framework to bring the element into view within any scrollable regions it is contained within.
/// </summary>
public void StartBringIntoView()
{
var bringIntoViewOptions = new BringIntoViewOptions()
{
AnimationDesired = true,
};
StartBringIntoView(bringIntoViewOptions);
}
/// <summary>
/// Initiates a request to the XAML framework to bring the element into view using the specified options.
/// </summary>
/// <param name="options">Options.</param>
public void StartBringIntoView(BringIntoViewOptions options)
{
if (options is null)
{
throw new ArgumentNullException(nameof(options));
}
if (Visibility == Visibility.Collapsed || this is FrameworkElement {
IsLoaded : false
})
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;
}
}
});
}
private void BtnStartBringIntoView_Click(object sender, RoutedEventArgs e)
{
try
{
txtStockOffsetsChangeDuration.Text = string.Empty;
FrameworkElement targetElement = null;
switch (cmbTargetElement.SelectedIndex)
{
case 0:
targetElement = rectangle;
break;
case 1:
targetElement = scrollView;
break;
}
if (targetElement != null)
{
BringIntoViewOptions options = new BringIntoViewOptions();
options.AnimationDesired = cmbAnimationDesired.SelectedIndex == 0;
options.HorizontalAlignmentRatio = Convert.ToDouble(txtHorizontalAlignmentRatio.Text);
options.VerticalAlignmentRatio = Convert.ToDouble(txtVerticalAlignmentRatio.Text);
options.HorizontalOffset = Convert.ToDouble(txtHorizontalOffset.Text);
options.VerticalOffset = Convert.ToDouble(txtVerticalOffset.Text);
if (chkLogScrollViewMessages.IsChecked == true)
{
AppendAsyncEventMessage("Invoking StartBringIntoView on " + targetElement.Name);
}
targetElement.StartBringIntoView(options);
}
if (targetElement == null && chkLogScrollViewMessages.IsChecked == true)
{
AppendAsyncEventMessage("TargetElement not found");
}
}
catch (Exception ex)
{
txtExceptionReport.Text = ex.ToString();
lstLogs.Items.Add(ex.ToString());
}
}
private void BtnStartBringIntoView_Click(object sender, RoutedEventArgs e)
{
try
{
txtInnerStockOffsetsChangeDuration.Text = string.Empty;
txtOuterStockOffsetsChangeDuration.Text = string.Empty;
FrameworkElement targetElement = null;
ItemsRepeater repeater = null;
switch (cmbNestingCombination.SelectedIndex)
{
case 0: //ScrollPresenterInScrollPresenter (1)
repeater = repeater1;
break;
case 2: //ScrollPresenterInScrollViewer
repeater = repeater2;
break;
case 3: //ScrollViewerInScrollPresenter
repeater = repeater3;
break;
case 4: //ScrollViewerInScrollViewer
repeater = repeater4;
break;
}
Border border = null;
if (repeater != null)
{
border = repeater.TryGetElement(Convert.ToInt16(txtTargetElement.Text)) as Border;
}
else
{
// case ScrollPresenterInScrollPresenter (2)
border = (innerScrollPresenter3.Content as StackPanel).Children[Convert.ToInt16(txtTargetElement.Text)] as Border;
}
if (border != null)
{
targetElement = border.Child as FrameworkElement;
if (targetElement != null)
{
BringIntoViewOptions options = new BringIntoViewOptions();
options.AnimationDesired = cmbAnimationDesired.SelectedIndex == 0;
options.HorizontalAlignmentRatio = Convert.ToDouble(txtHorizontalAlignmentRatio.Text);
options.VerticalAlignmentRatio = Convert.ToDouble(txtVerticalAlignmentRatio.Text);
options.HorizontalOffset = Convert.ToDouble(txtHorizontalOffset.Text);
options.VerticalOffset = Convert.ToDouble(txtVerticalOffset.Text);
if (chkIgnoreSnapPoints.IsChecked == false)
{
ScrollPresenter scrollPresenter1 = null;
ScrollPresenter scrollPresenter2 = null;
switch (cmbNestingCombination.SelectedIndex)
{
case 0: //ScrollPresenterInScrollPresenter (1)
scrollPresenter1 = outerScrollPresenter;
scrollPresenter2 = innerScrollPresenter;
break;
case 1: //ScrollPresenterInScrollPresenter (2)
scrollPresenter1 = outerScrollPresenter3;
scrollPresenter2 = innerScrollPresenter3;
break;
case 2: //ScrollPresenterInScrollViewer
scrollPresenter1 = innerScrollPresenter2;
break;
case 3: //ScrollViewerInScrollPresenter
scrollPresenter1 = outerScrollPresenter2;
break;
}
if (scrollPresenter1 != null)
{
RefreshSnapPoints(scrollPresenter1, scrollPresenter1.Content as StackPanel);
}
if (scrollPresenter2 != null)
{
RefreshSnapPoints(scrollPresenter2, scrollPresenter2.Content as StackPanel);
}
}
if (chkLogBringIntoViewRequestedEvents.IsChecked == true)
{
AppendAsyncEventMessage("Invoking StartBringIntoView on " + targetElement.Name);
}
targetElement.StartBringIntoView(options);
}
}
if (targetElement == null && chkLogBringIntoViewRequestedEvents.IsChecked == true)
{
AppendAsyncEventMessage("TargetElement not found");
}
}
catch (Exception ex)
{
txtExceptionReport.Text = ex.ToString();
lstScrollPresenterEvents.Items.Add(ex.ToString());
}
}
private async void ButtonCardItem_PreviewKeyDown(object sender, KeyRoutedEventArgs e)
{
FlipViewBanner.UpdateLayout();
VerticalRepeater.UpdateLayout();
FindNextElementOptions findNextElementOptions = new FindNextElementOptions
{
SearchRoot = ScrollViewerHome,
XYFocusNavigationStrategyOverride = XYFocusNavigationStrategyOverride.NavigationDirectionDistance
};
//Before move focus
//Get current item data context
var currentItem = (sender as Button).DataContext as ProductItem;
var currentFocusElement = FocusManager.GetFocusedElement() as Button;
try
{
switch (e.OriginalKey)
{
case VirtualKey.Up:
case VirtualKey.GamepadDPadUp:
case VirtualKey.GamepadLeftThumbstickUp:
{
BringIntoViewOptions options = new BringIntoViewOptions
{
VerticalOffset = 50.0,
AnimationDesired = true
};
//var tt = currentFocusElement.TransformToVisual(appWindow.Content);
//Point currentFocusLeftTopPoint = tt.TransformPoint(new Point(appWindow.Bounds.Left, appWindow.Bounds.Top));
//Rect rect = new Rect(124, currentFocusLeftTopPoint.Y - 500, 1920, 500);
//var nextFocus = FocusManager.FindNextFocusableElement(FocusNavigationDirection.Next, rect);
var candidate = FocusManager.FindNextElement(FocusNavigationDirection.Up, findNextElementOptions);
if (candidate != null && candidate is Button)
{
(candidate as Control).StartBringIntoView();
(candidate as Control).Focus(FocusState.Programmatic);
e.Handled = true;
}
else if (candidate != null)
{
var current = FlipViewBanner.SelectedItem;
var currentContainer = FlipViewBanner.ContainerFromItem(current) as FlipViewItem;
var result = await FocusManager.TryFocusAsync(currentContainer, FocusState.Programmatic);
currentContainer.StartBringIntoView();
e.Handled = true;
}
}
break;
case VirtualKey.Down:
case VirtualKey.GamepadDPadDown:
case VirtualKey.GamepadLeftThumbstickDown:
{
//Last river
BringIntoViewOptions options = new BringIntoViewOptions
{
VerticalOffset = -50.0,
AnimationDesired = true
};
var candidate = FocusManager.FindNextElement(FocusNavigationDirection.Down, findNextElementOptions);
if (candidate != null && candidate is Control)
{
(candidate as Control).StartBringIntoView();
(candidate as Control).Focus(FocusState.Programmatic);
e.Handled = true;
}
}
break;
case VirtualKey.Left:
case VirtualKey.GamepadDPadLeft:
case VirtualKey.GamepadLeftThumbstickLeft:
{
var parent = TreeHelper.FindParentByName <ItemsRepeater>(sender as Button, "HorizontalRepeater");
FindNextElementOptions findNextElementOptions1 = new FindNextElementOptions
{
SearchRoot = parent,
XYFocusNavigationStrategyOverride = XYFocusNavigationStrategyOverride.Projection
};
var candidate = FocusManager.FindNextElement(FocusNavigationDirection.Left, findNextElementOptions1);
if (candidate != null && candidate is Control)
{
(candidate as Control).StartBringIntoView();
(candidate as Control).Focus(FocusState.Programmatic);
e.Handled = true;
}
else
{
ShellPage.shellPage.navigationView.IsPaneOpen = true;
e.Handled = true;
}
}
break;
case VirtualKey.Right:
case VirtualKey.GamepadDPadRight:
case VirtualKey.GamepadLeftThumbstickRight:
{
}
break;
case VirtualKey.GamepadA:
case VirtualKey.Enter:
case VirtualKey.Space:
{
}
break;
default:
break;
}
}
catch { }
finally
{
}
}