//Monitor and handle the scroll viewer
private async void ScrollViewer_ViewChanged(object sender, ScrollViewerViewChangedEventArgs e)
{
try
{
//Get current scroll item
int CurrentOffSetId = EventsScrollViewer.GetCurrentOffsetIndex(ListView_Items);
if (CurrentOffSetId < 0)
{
return;
}
//Update the current item count
AppVariables.CurrentShownItemCount = CurrentOffSetId + 1;
if (stackpanel_Header.Visibility == Visibility.Visible || AppVariables.CurrentTotalItemsCount == 0)
{
textblock_StatusCurrentItem.Text = AppVariables.CurrentShownItemCount.ToString();
}
else
{
textblock_StatusCurrentItem.Text = AppVariables.CurrentShownItemCount + "/" + AppVariables.CurrentTotalItemsCount;
}
//Update the shown item content
await EventsScrollViewer.ScrollViewerUpdateContent(ListView_Items, CurrentOffSetId);
}
catch { }
}
//Monitor and handle the scroll viewer
private async void ScrollViewer_ViewChanged(object sender, ScrollViewerViewChangedEventArgs e)
{
try
{
//Get current scroll item
VirtualizingStackPanel virtualizingStackPanel = AVFunctions.FindVisualChild <VirtualizingStackPanel>(ListView_Items);
Int32 CurrentOffSetId = (virtualizingStackPanel.Orientation == Orientation.Horizontal) ? (Int32)virtualizingStackPanel.HorizontalOffset : (Int32)virtualizingStackPanel.VerticalOffset;
//Update the current item count
textblock_StatusCurrentItem.Tag = (CurrentOffSetId + 1).ToString();
Int32 HeaderTargetSize = Convert.ToInt32(stackpanel_Header.Tag);
Int32 HeaderCurrentSize = Convert.ToInt32(stackpanel_Header.Height);
if (HeaderCurrentSize == HeaderTargetSize || AppVariables.CurrentTotalItemsCount == 0)
{
textblock_StatusCurrentItem.Text = textblock_StatusCurrentItem.Tag.ToString();
}
else
{
textblock_StatusCurrentItem.Text = textblock_StatusCurrentItem.Tag.ToString() + "/" + AppVariables.CurrentTotalItemsCount;
}
//Update the shown item content
await EventsScrollViewer.ScrollViewerUpdateContent(ListView_Items, CurrentOffSetId);
//Check if new items need to be loaded
await EventsScrollViewer.ScrollViewerAddItems(ListView_Items, CurrentOffSetId);
}
catch { }
}
public async Task AdjustItemsScrollingDirection(Int32 Direction)
{
try
{
if (!AdjustingItemsScrollingDirection)
{
if (Direction == 0)
{
Style TargetStyle = (Style)Application.Current.Resources["ListViewVertical"];
if (ListView_Items.Style != TargetStyle)
{
AdjustingItemsScrollingDirection = true;
Double[] CurrentOffset = EventsScrollViewer.GetCurrentOffset(ListView_Items);
ScrollViewer virtualScrollViewer = AVFunctions.FindVisualChild <ScrollViewer>(ListView_Items);
if (virtualScrollViewer != null)
{
ListView_Items.Style = TargetStyle;
ListView_Items.ItemTemplate = (DataTemplate)Application.Current.Resources["ListViewItemsVertical" + Convert.ToInt32(AppVariables.ApplicationSettings["ListViewStyle"])];
ListView_Items.ItemContainerStyle = (Style)Application.Current.Resources["ListViewItemStretchedVertical"];
await Task.Delay(10);
virtualScrollViewer.ChangeView(CurrentOffset[1], (CurrentOffset[0] + 2), null);
//Debug.WriteLine("Scrolling to vertical:" + (CurrentOffset[0] + 2));
}
//Adjust Status Current Item margin
button_StatusCurrentItem.Margin = new Thickness(6, 0, 0, 6);
AdjustingItemsScrollingDirection = false;
}
}
else if (Direction == 1)
{
Style TargetStyle = (Style)Application.Current.Resources["ListViewHorizontal"];
if (ListView_Items.Style != TargetStyle)
{
AdjustingItemsScrollingDirection = true;
Double[] CurrentOffset = EventsScrollViewer.GetCurrentOffset(ListView_Items);
ScrollViewer virtualScrollViewer = AVFunctions.FindVisualChild <ScrollViewer>(ListView_Items);
if (virtualScrollViewer != null)
{
ListView_Items.Style = TargetStyle;
ListView_Items.ItemTemplate = (DataTemplate)Application.Current.Resources["ListViewItemsHorizontal" + Convert.ToInt32(AppVariables.ApplicationSettings["ListViewStyle"])];
ListView_Items.ItemContainerStyle = (Style)Application.Current.Resources["ListViewItemStretchedHorizontal"];
await Task.Delay(10);
virtualScrollViewer.ChangeView((CurrentOffset[1] + 2), CurrentOffset[0], null);
//Debug.WriteLine("Scrolling to horizontal:" + (CurrentOffset[1] + 2));
}
//Adjust Status Current Item margin
if (AVFunctions.DevMobile())
{
button_StatusCurrentItem.Margin = new Thickness(6, 0, 0, 6);
}
else
{
button_StatusCurrentItem.Margin = new Thickness(16, 0, 0, 16);
}
AdjustingItemsScrollingDirection = false;
}
}
else if (Direction == 2)
{
Rect ScreenSize = AVFunctions.AppWindowResolution();
if (ScreenSize.Width > ScreenSize.Height)
{
await AdjustItemsScrollingDirection(1);
}
else
{
await AdjustItemsScrollingDirection(0);
}
}
}
}
catch { AdjustingItemsScrollingDirection = false; }
}
//Adjust the news items scrolling direction
public async Task AdjustItemsScrollingDirection(int Direction)
{
try
{
if (Direction == 0)
{
Style TargetStyle = (Style)Application.Current.Resources["ListViewVertical"];
if (ListView_Items.Style != TargetStyle)
{
ScrollViewer virtualScrollViewer = AVFunctions.FindVisualChild <ScrollViewer>(ListView_Items);
if (virtualScrollViewer != null)
{
object CurrentOffset = EventsScrollViewer.GetCurrentOffsetItem(ListView_Items);
ListView_Items.Style = TargetStyle;
ListView_Items.ItemTemplate = (DataTemplate)Application.Current.Resources["ListViewItemsVertical" + Convert.ToInt32(AppVariables.ApplicationSettings["ListViewStyle"])];
ListView_Items.ItemContainerStyle = (Style)Application.Current.Resources["ListViewItemStretchedVertical"];
await Task.Delay(100);
ListView_Items.ScrollIntoView(CurrentOffset);
System.Diagnostics.Debug.WriteLine("Changed listview to vertical style.");
}
//Adjust Status Current Item margin
button_StatusCurrentItem.Margin = new Thickness(6, 0, 0, 6);
}
}
else if (Direction == 1)
{
Style TargetStyle = (Style)Application.Current.Resources["ListViewHorizontal"];
if (ListView_Items.Style != TargetStyle)
{
ScrollViewer virtualScrollViewer = AVFunctions.FindVisualChild <ScrollViewer>(ListView_Items);
if (virtualScrollViewer != null)
{
object CurrentOffset = EventsScrollViewer.GetCurrentOffsetItem(ListView_Items);
ListView_Items.Style = TargetStyle;
ListView_Items.ItemTemplate = (DataTemplate)Application.Current.Resources["ListViewItemsHorizontal" + Convert.ToInt32(AppVariables.ApplicationSettings["ListViewStyle"])];
ListView_Items.ItemContainerStyle = (Style)Application.Current.Resources["ListViewItemStretchedHorizontal"];
await Task.Delay(100);
ListView_Items.ScrollIntoView(CurrentOffset);
System.Diagnostics.Debug.WriteLine("Changed listview to horizontal style.");
}
//Adjust Status Current Item margin
if (AVFunctions.DevMobile())
{
button_StatusCurrentItem.Margin = new Thickness(6, 0, 0, 6);
}
else
{
button_StatusCurrentItem.Margin = new Thickness(16, 0, 0, 16);
}
}
}
else if (Direction == 2)
{
Rect ScreenSize = AVFunctions.AppWindowResolution();
if (ScreenSize.Width > ScreenSize.Height)
{
await AdjustItemsScrollingDirection(1);
}
else
{
await AdjustItemsScrollingDirection(0);
}
}
}
catch
{
System.Diagnostics.Debug.WriteLine("Failed to adjust item scrolling direction.");
}
}
