public ScrollListViewModel(ObservableCollection <MovieShort> moviesList, LoadMore loadMethod, IPageService pageService) : this()
{
_loadMore = loadMethod;
_pageService = pageService;
try
{
Movie = new InfiniteScrollCollection <MovieShort>(moviesList)
{
OnLoadMore = async() =>
{
IsBusy = true;
await _pageService.PushAsync(new PopupLoading());
var movies = LoadMoreMovies();
await _pageService.PopAsync();
IsBusy = false;
return(movies);
},
OnCanLoadMore = () => !_isEnded
};
}
catch (Exception) { }
}
private void situationView_DoubleClick(object sender, EventArgs e)
{
string[] item = fastSituationView.SelectedObject.ToString().Split(' ');
bool flag = false;
int messageID = SituationIndex.Index[item[0]][Int32.Parse(item[1])][0];
//tagTable.EnsureVisible(tagTable.GetItemCount() - 1);
while (!flag)
{
if (chatTable.Items.Count > messageID)
{
chatTable.EnsureVisible(messageID);
flag = true;
}
else
{
//DialogResult res = MessageBox.Show("This will load additional messages. Proceed?");
//if (res == DialogResult.OK)
//{
LoadMore?.Invoke(this, EventArgs.Empty);
//}
}
}
}
// This happens many times a second during a scroll, so be wary of the code you place here.
// We are given a few useful parameters to help us work out if we need to load some more data,
// but first we check if we are waiting for the previous load to finish.
public override void OnScrolled(RecyclerView view, int dx, int dy)
{
if (dy == 0)
{
return;
}
_startScrollPosition += dy;
_gridView.RaiseOnScroll(dy / _density, _recyclerView.GetHorizontalScrollOffset() / _density, _startScrollPosition / _density, ScrollActionType.Finger);
if (!EnableLoadMore)
{
return;
}
var lastVisibleItemPosition = 0;
var totalItemCount = _layoutManager.ItemCount;
if (_layoutManager is StaggeredGridLayoutManager manager)
{
var lastVisibleItemPositions = manager.FindLastVisibleItemPositions(null);
// get maximum element within the list
lastVisibleItemPosition = GetLastVisibleItem(lastVisibleItemPositions);
}
else if (_layoutManager is LinearLayoutManager)
{
lastVisibleItemPosition = ((LinearLayoutManager)_layoutManager).FindLastVisibleItemPosition();
}
// If the total item count is zero and the previous isn't, assume the
// list is invalidated and should be reset back to initial state
if (totalItemCount < _previousTotalItemCount)
{
_previousTotalItemCount = totalItemCount;
if (totalItemCount == 0)
{
_loading = true;
}
}
// If it’s still loading, we check to see if the dataset count has
// changed, if so we conclude it has finished loading and update the current page
// number and total item count.
if (_loading && (totalItemCount > _previousTotalItemCount))
{
_loading = false;
_previousTotalItemCount = totalItemCount;
}
// If it isn’t currently loading, we check to see if we have breached
// the visibleThreshold and need to reload more data.
// If we do need to reload some more data, we execute onLoadMore to fetch the data.
// threshold should reflect how many total columns there are too
if (_loading || (lastVisibleItemPosition + _visibleThreshold) <= totalItemCount)
{
return;
}
LoadMore?.Invoke();
_loading = true;
}
private void ScrollViewer_ViewChanged(object sender, ScrollViewerViewChangedEventArgs e)
{
if (_scrollViewer.VerticalOffset == 0)
{
LoadMore?.Invoke(this, new EventArgs());
_isLoadMore = true;
}
}
public void GetContentList <T> (T context) where T : IMovieEnumeration
{
var contextMovies = context.GetMovieEnumeration();
_loadMore = new LoadMore(context.GetMovieEnumeration);
FullDescription = new ObservableCollection <MovieShort>(contextMovies);
ShortDescription = new ObservableCollection <MovieShort>(FullDescription.Take(_numbOfMovies));
}
void InfiniteListView_ItemAppearing(object sender, ItemVisibilityEventArgs e)
{
var items = ItemsSource as IList;
if (items != null && e.Item == items[items.Count - 1] && !IsRefreshing)
{
LoadMore?.Invoke(this, new EventArgs());
LoadMoreCommand?.Execute(null);
}
}
private void chatTable_Scroll(object sender, ScrollEventArgs e)
{
scrollCount = e.NewValue;
Console.WriteLine(scrollCount);
if ((scrollCount - 988) % 100 == 0 || ((scrollCount - 984) % 100 == 0) && scrollCount != 0) //i promise i will learn what wndproc is one day...
{
LoadMore?.Invoke(this, EventArgs.Empty);
}
}
private void ScrollViewer_ViewChanged(object sender, ScrollViewerViewChangedEventArgs e)
{
var scrollViewer = sender as ScrollViewer;
var verticalOffsetValue = scrollViewer.VerticalOffset;
var maxVerticalOffsetValue = scrollViewer.ExtentHeight - scrollViewer.ViewportHeight;
if (maxVerticalOffsetValue < 0 || verticalOffsetValue == maxVerticalOffsetValue)
{
LoadMore?.Invoke(this, new EventArgs());
}
}
// This happens many times a second during a scroll, so be wary of the code you place here.
// We are given a few useful parameters to help us work out if we need to load some more data,
// but first we check if we are waiting for the previous load to finish.
public override void OnScrolled(RecyclerView recyclerView, int dx, int dy)
{
var lastVisibleItemPosition = mLayoutManager.FindFirstVisibleItemPosition();
if (lastVisibleItemPosition < visibleThreshold)
{
LoadMore?.Invoke(this, new LoadMoreEventArgs {
Page = lastVisibleItemPosition, TotalItemsCount = 0
});
}
}
public void Initialize(INavigationParameters parameters)
{
if (parameters.ContainsKey("ListJobs"))
{
var ListJobs = parameters["ListJobs"] as ParametersSearch;
Keyword = ListJobs.EntryKeyWord;
IsRemote = ListJobs.IsRemote;
Pagenumber = 0;
LoadMore.Execute(null);
}
}
public override void OnScrolled(RecyclerView view, int dx, int dy)
{
if (dy == 0)
{
return;
}
_startScrollPosition += dy;
_fastGridView.RaiseOnScroll(dy / _density, _recyclerView.GetHorizontalScrollOffset() / _density,
_startScrollPosition / _density, ScrollActionType.Finger);
if (!EnableLoadMore)
{
return;
}
var lastVisibleItemPosition = 0;
var totalItemCount = _layoutManager.ItemCount;
switch (_layoutManager)
{
case StaggeredGridLayoutManager manager:
var lastVisibleItemPositions = manager.FindLastVisibleItemPositions(null);
lastVisibleItemPosition = GetLastVisibleItem(lastVisibleItemPositions);
break;
case LinearLayoutManager _:
lastVisibleItemPosition = ((LinearLayoutManager)_layoutManager).FindLastVisibleItemPosition();
break;
}
if (totalItemCount < _previousTotalItemCount)
{
_previousTotalItemCount = totalItemCount;
if (totalItemCount == 0)
{
_loading = true;
}
}
if (_loading && (totalItemCount > _previousTotalItemCount))
{
_loading = false;
_previousTotalItemCount = totalItemCount;
}
if (_loading || (lastVisibleItemPosition + _visibleThreshold) <= totalItemCount)
{
return;
}
LoadMore?.Invoke();
_loading = true;
}
public void GetContentHeap <T> (T context) where T : IMovieHeap
{
var contextMovies = context.GetMovieHeap();
_loadMore = new LoadMore(context.GetMovieEnumeration);
FullDescription = new ObservableCollection <MovieShort>(contextMovies.Results);
LatestStartDate = contextMovies.Dates.From;
LatestEndsDate = contextMovies.Dates.UntilTo;
ShortDescription = new ObservableCollection <MovieShort>(FullDescription.Take(_numbOfMovies));
}
void InfiniteListView_ItemAppearing(object sender, ItemVisibilityEventArgs e)
{
var items = ItemsSource as IList;
if (items != null && e.Item == items[items.Count - 1])
{
if (LoadMoreCommand != null && LoadMoreCommand.CanExecute(null))
{
LoadMoreCommand.Execute(null);
}
LoadMore?.Invoke(this, null);
}
}
public override void OnScrolled(int dx, int dy)
{
base.OnScrolled(dx, dy);
Scroll?.Invoke(this, new ScrollEventArgs(dx, dy));
if (dy <= 0)
{
return;
}
var visibleItemCount = ViewLayoutManager.ChildCount;
var totalItemCount = ViewLayoutManager.ItemCount;
var pastVisiblesItems = (ViewLayoutManager is LinearLayoutManager ? ViewLayoutManager as LinearLayoutManager : ViewLayoutManager is GridLayoutManager ? ViewLayoutManager as GridLayoutManager : null).FindFirstVisibleItemPosition();
if ((visibleItemCount + pastVisiblesItems) >= totalItemCount - 3)
{
LoadMore?.Invoke(this, new EventArgs());
}
}
public void EnsureMessageIsVisible(int id)
{
bool flag = false;
while (!flag)
{
if (chatTable.Items.Count > id)
{
chatTable.EnsureVisible(id);
//chatTable.SelectedObjects.Add(chatTable.GetModelObject(id));
flag = true;
}
else
{
//DialogResult res = MessageBox.Show("This will load additional messages. Proceed?");
//if (res == DialogResult.OK)
//{
LoadMore?.Invoke(this, EventArgs.Empty);
//}
}
}
}
// This happens many times a second during a scroll, so be wary of the code you place here.
// We are given a few useful parameters to help us work out if we need to load some more data,
// but first we check if we are waiting for the previous load to finish.
public override void OnScrolled(RecyclerView recyclerView, int dx, int dy)
{
int lastVisibleItemPosition = 0;
int totalItemCount = mLayoutManager.ItemCount;
if (mLayoutManager is StaggeredGridLayoutManager staggeredGridLayoutManager)
{
int[] lastVisibleItemPositions = staggeredGridLayoutManager.FindLastVisibleItemPositions(null);
// get maximum element within the list
lastVisibleItemPosition = GetLastVisibleItem(lastVisibleItemPositions);
}
else if (mLayoutManager is GridLayoutManager gridLayoutManager)
{
lastVisibleItemPosition = gridLayoutManager.FindLastVisibleItemPosition();
}
else if (mLayoutManager is LinearLayoutManager linearLayoutManager)
{
lastVisibleItemPosition = linearLayoutManager.FindLastVisibleItemPosition();
}
// If the total item count is zero and the previous isn't, assume the
// list is invalidated and should be reset back to initial state
if (totalItemCount < previousTotalItemCount)
{
this.currentPage = this.startingPageIndex;
this.previousTotalItemCount = totalItemCount;
if (totalItemCount == 0)
{
this.loading = true;
}
}
// If it’s still loading, we check to see if the dataset count has
// changed, if so we conclude it has finished loading and update the current page
// number and total item count.
if (loading && (totalItemCount > previousTotalItemCount))
{
loading = false;
previousTotalItemCount = totalItemCount;
}
// If it isn’t currently loading, we check to see if we have breached
// the visibleThreshold and need to reload more data.
// If we do need to reload some more data, we execute onLoadMore to fetch the data.
// threshold should reflect how many total columns there are too
if (!loading && (lastVisibleItemPosition + visibleThreshold) > totalItemCount)
{
currentPage++;
LoadMore?.Invoke(this, new LoadMoreEventArgs {
Page = currentPage, TotalItemsCount = totalItemCount
});
loading = true;
}
if (lastVisibleItemPosition == totalItemCount - 1)
{
LastItemVisibleEvent?.Invoke(this, new LastItemVisibleEventArgs {
IsLastItemVisible = true
});
}
else
{
LastItemVisibleEvent?.Invoke(this, new LastItemVisibleEventArgs {
IsLastItemVisible = false
});
}
}
private void Button_Click(object sender, RoutedEventArgs e)
{
LoadMore?.Invoke(this, new EventArgs());
_isLoadMore = true;
}
public void SendLoadMore()
{
LoadMore?.Invoke(this, new EventArgs());
}
