// Opens the endless viewing mode and initializes all settings
private void OpenEndlessView()
{
if (!_isEndless)
{
startingImage = _displayedItemIndex;
InfiScrollViewer.Visibility = Visibility.Visible;
InitializeInfiniteScroller();
InfiScrollViewer.ScrollToVerticalOffset(0);
foreach (Control item in ViewMenu.Items)
{
if (item is MenuItem && item.Name != "ShowSortEndless" && item.Name != "ZoomInMenu" &&
item.Name != "ZoomOutMenu" && item.Name != "FullscreenMenu" &&
item.Name != "IncludeSpecialMenu" && item.Name != "IncludeOtherFilesMenu" &&
item.Name != "IncludeSubMenu" && item.Name != "IncludePrefixMenu")
{
item.IsEnabled = false;
}
}
ShowSortEndless.IsChecked = true;
EditMenu.IsEnabled = false;
OpenMenu.IsEnabled = false;
MakeTypeVisible("");
}
else
{
_displayedItemIndex = startingImage;
startingImage = 0;
InfiScrollViewer.Visibility = Visibility.Hidden;
InfiScroll.Children.RemoveRange(0, InfiScroll.Children.Count);
InfiScrollViewer.ScrollToVerticalOffset(400);
foreach (Control item in ViewMenu.Items)
{
if (item is MenuItem)
{
item.IsEnabled = true;
}
}
ShowSortEndless.IsChecked = false;
EditMenu.IsEnabled = true;
OpenMenu.IsEnabled = true;
UpdateContent();
}
_isEndless = !_isEndless;
}
// Dynamically loads new images as you scroll down
private void InfiScrollViewer_PreviewMouseWheel(object sender, System.Windows.Input.MouseWheelEventArgs e)
{
if (InfiScrollViewer.VerticalOffset / InfiScrollViewer.ScrollableHeight > 0.95 || Math.Abs(InfiScrollViewer.VerticalOffset - InfiScrollViewer.ScrollableHeight) < 5)
{
if (_displayedItemIndex + _loadedOffset + _preloadedScrollAhead >= _displayItems.Count - 1)
{
return;
}
double lastPos = InfiScrollViewer.VerticalOffset;
double originalSize = InfiScrollViewer.ScrollableHeight;
//InfiScroll.Children.RemoveAt(0);
InfiScroll.UpdateLayout();
double lostSize = originalSize - InfiScrollViewer.ScrollableHeight;
double scrollTo = lastPos - lostSize;
InfiScrollViewer.ScrollToVerticalOffset(scrollTo);
AddNewRow(true);
int selection = _displayedItemIndex + _loadedOffset + _preloadedScrollAhead + 1;
// All scrolled to content will remain in memory
_displayItems[selection].PreloadContent();
((Image)InfiScroll.Children[InfiScroll.Children.Count - 1]).Source =
_displayItems[selection].GetTypeOfFile() == "image"
? ((ImageItem)_displayItems[selection]).GetImage()
: _displayItems[selection].GetThumbnail();
_loadedOffset++;
}
// Buggy implementation of support for scrolling up
/*else if (InfiScrollViewer.VerticalOffset / InfiScrollViewer.ScrollableHeight < 0.05)
* {
* if (_displayedItemIndex + loadedOffset - preloadedScrollAhead <= 0) return;
*
* double lastPos = InfiScrollViewer.VerticalOffset;
* double originalSize = InfiScrollViewer.ScrollableHeight;
*
* InfiScroll.Children.RemoveAt(InfiScroll.Children.Count - 1);
* InfiScroll.UpdateLayout();
*
* double lostSize = originalSize - InfiScrollViewer.ScrollableHeight;
* double scrollTo = lastPos + lostSize;
*
* InfiScrollViewer.ScrollToVerticalOffset(scrollTo);
*
* AddNewRow(false);
*
* int selection = _displayedItemIndex + loadedOffset - preloadedScrollAhead - 1;
*
* ((Image)InfiScroll.Children[0]).Source =
* _displayItems[selection].GetTypeOfFile() == "image"
* ? ((ImageItem)_displayItems[selection]).GetImage()
* : _displayItems[selection].GetThumbnail();
*
* loadedOffset--;
* }*/
}