public void OnScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount)
{
if (OnScrollListener != null)
OnScrollListener.OnScroll(view, firstVisibleItem, visibleItemCount, totalItemCount);
if (totalItemCount == 0)
return;
if (IsSameRow(firstVisibleItem))
{
var newScrollY = TopItemScrollY;
var isSignificantDelta = Math.Abs(lastScrollY - newScrollY) > ScrollThreshold;
if (isSignificantDelta)
{
if (lastScrollY > newScrollY)
OnScrollUp();
else
OnScrollDown();
}
lastScrollY = newScrollY;
}
else
{
if (firstVisibleItem > previousVisibleItem)
OnScrollUp();
else
OnScrollDown();
lastScrollY = TopItemScrollY;
previousVisibleItem = firstVisibleItem;
}
}
void AbsListView.IOnScrollListener.OnScrollStateChanged(AbsListView view, ScrollState scrollState)
{
////switch (scrollState)
////{
//// case ScrollState.Idle:// 是当屏幕停止滚动时
//// scrollFlag = false;
//// var lastPostion = view.LastVisiblePosition;
//// var viewCount = view.Count;
//// if (lastPostion==viewCount-1)
//// {
//// }
//// break;
//// case ScrollState.TouchScroll:// 滚动时
//// scrollFlag = true;
//// break;
//// case ScrollState.Fling:// 是当用户由于之前划动屏幕并抬起手指，屏幕产生惯性滑动时
//// scrollFlag = false;
//// break;
////}
////listview滚动时会执行这个方法，这儿调用加载数据的方法。
//_adapter.NotifyDataSetChanged();//提醒adapter更新
//_listView.SetSelection(_lastItem - 1); ;//设置listview的当前位置，如果不设置每次加载完后都会返回到list的第一项。
}
public void OnScroll (AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) {
Console.WriteLine ("on scrolll event");
if (psl.mDelegateOnScrollListener != null) { // delegate
psl.mDelegateOnScrollListener.OnScroll(view, firstVisibleItem, visibleItemCount, totalItemCount);
}
// get expected adapter or fail fast
IListAdapter adapter = psl.Adapter;
if (adapter == null || visibleItemCount == 0) return; // nothing to do
Boolean isFirstVisibleItemSection =
isItemViewTypePinned(adapter, adapter.GetItemViewType(firstVisibleItem));
if (isFirstVisibleItemSection) {
View sectionView = psl.GetChildAt(0);
if (sectionView.Top == psl.PaddingTop) { // view sticks to the top, no need for pinned shadow
psl.destroyPinnedShadow();
} else { // section doesn't stick to the top, make sure we have a pinned shadow
psl.ensureShadowForPosition(firstVisibleItem, firstVisibleItem, visibleItemCount);
}
} else { // section is not at the first visible position
int sectionPosition = psl.findCurrentSectionPosition(firstVisibleItem);
if (sectionPosition > -1) { // we have section position
psl.ensureShadowForPosition(sectionPosition, firstVisibleItem, visibleItemCount);
} else { // there is no section for the first visible item, destroy shadow
psl.destroyPinnedShadow();
}
}
}
void AbsListView.IOnScrollListener.OnScrollStateChanged(AbsListView view, ScrollState scrollState)
{
if (OnScrollStateChanged != null)
{
OnScrollStateChanged(view, scrollState);
}
}
void list_Scroll(object sender, AbsListView.ScrollEventArgs e)
{
for (int i = e.FirstVisibleItem - adapter.HeadersCount; i < e.FirstVisibleItem + e.VisibleItemCount - adapter.FootersCount; i++)
{
(ViewModel as SearchQuestionsResultsViewModel).Questions[i].OnShowing();
}
}
void OnScrollStateChanged (object sender, AbsListView.ScrollStateChangedEventArgs e)
{
var view = (AbsListView)sender;
switch (e.ScrollState) {
case ScrollState.Idle:
mBusy = false;
int first = view.FirstVisiblePosition;
int count = view.ChildCount;
for (int i = 0; i < count; i++) {
TextView t = (TextView)view.GetChildAt (i);
if (t.Tag != null) {
t.Text = (Cheeses.CheeseStrings[first + i]);
t.Tag = null;
}
}
mStatus.Text = "Idle";
break;
case ScrollState.TouchScroll:
mBusy = true;
mStatus.Text = "Touch scroll";
break;
case ScrollState.Fling:
mBusy = true;
mStatus.Text = "Fling";
break;
}
}
void HandleListRecycling (object sender, AbsListView.RecyclerEventArgs e)
{
var favView = e.View as FavoriteView;
if (favView == null)
return;
favView.ClearMap ();
}
void AbsListView.IOnScrollListener.OnScroll(AbsListView view, int firstVisibleItem, int visibleItemCount,
int totalItemCount)
{
if (OnScroll != null)
{
OnScroll(view, firstVisibleItem, visibleItemCount, totalItemCount);
}
}
void HandleScroll (object sender, AbsListView.ScrollEventArgs e)
{
if (loading
|| e.FirstVisibleItem + e.VisibleItemCount + 1 < e.TotalItemCount
|| !hasNextPage)
return;
loading = true;
DoFetch ();
}
void list_Scroll(object sender, AbsListView.ScrollEventArgs e)
{
var tournaments = (ViewModel as LastAddedTournamentsViewModel).Tournaments;
for (int i = e.FirstVisibleItem - listView.HeaderViewsCount;
i < e.FirstVisibleItem + e.VisibleItemCount - listView.FooterViewsCount && i < tournaments.Count; i++)
{
tournaments[i].OnShowing();
}
}
/**
* Returns the position within the adapter's dataset for the view, where view is an adapter item or a descendant of an adapter item.
* Unlike {@link AdapterView#getPositionForView(android.view.View)}, returned position will reflect the position of the item given view is representing,
* by subtracting the header views count.
*
* @param absListView the ListView containing the view.
* @param view an adapter item or a descendant of an adapter item. This must be visible in given AdapterView at the time of the call.
*
* @return the position of the item in the AdapterView represented by given view, or {@link AdapterView#INVALID_POSITION} if the view does not
* correspond to a list item (or it is not visible).
*/
public static int getPositionForView(AbsListView absListView, View view)
{
int position = absListView.GetPositionForView(view);
if (absListView is ListView)
{
position -= ((ListView)absListView).HeaderViewsCount;
}
return position;
}
void list_Scroll(object sender, AbsListView.ScrollEventArgs e)
{
if (e.FirstVisibleItem + e.VisibleItemCount == e.TotalItemCount)
{
if (ViewModel.IsMoreAvailable && !ViewModel.IsBusy)
{
ViewModel.LoadMoreCommand.Execute(null);
}
}
}
void Android.Widget.AbsListView.IOnScrollListener.OnScrollStateChanged(Android.Widget.AbsListView view, Android.Widget.ScrollState scrollState)
{
if (scrollState == Android.Widget.ScrollState.Idle)
{
if (mPostsListView.LastVisiblePosition >= mPostsListView.Count - 1)
{
CatalogNewsViewModel.MoreNewsCommand.Execute(null);
}
}
}
public void OnScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount)
{
bool loadMore = firstVisibleItem + visibleItemCount >= totalItemCount && totalItemCount > 0;
if (loadMore && adapter.Adding == false)
{
adapter.AppendMoreData();
//adapter.NotifyDataSetChanged();
}
}
public void OnScrollStateChanged(AbsListView view, ScrollState scrollState)
{
if (hideToolbar && ActionBar.IsShowing)
{
ActionBar.Hide();
}
else if (!hideToolbar && !ActionBar.IsShowing)
{
ActionBar.Show();
}
}
void nativeListView_Scroll(object sender, AbsListView.ScrollEventArgs e)
{
int visblepos = nativeListView.FirstVisiblePosition;
if( formsListView != null && formsListView.Scroll != null )
{
formsListView.Scroll(visblepos - 1);
}
System.Diagnostics.Debug.WriteLine( "Current visible : " + visblepos.ToString() );
}
public void OnScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount)
{
lock (this.Lock)
{
var loadMore = firstVisibleItem + visibleItemCount >= (totalItemCount - 3);
if (loadMore && this.ViewModel.CanLoadMore && !this.ViewModel.IsBusy)
{
this.ViewModel.LoadMoreCommand.Execute(null);
}
}
}
public void OnScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount)
{
if (firstVisibleItem > Math.Max(previousFirstVisvibleItem, 3))
{
//User scrolls down by at least one item
previousFirstVisvibleItem = firstVisibleItem;
hideToolbar = true;
}
else if (firstVisibleItem +1 < previousFirstVisvibleItem)
{
//User scrolls up by at least one item
hideToolbar = false;
}
}
public static void SetListViewHeightBasedOnChildren(AbsListView listView, float marginBetweenItems)
{
var listAdapter = listView.Adapter;
if (listView == null || listAdapter == null || listAdapter.Count == 0)
return;
int desiredWidth = View.MeasureSpec.MakeMeasureSpec(listView.Width, MeasureSpecMode.Unspecified);
int totalHeight = 0;
View view = null;
for (int i = 0; i < listAdapter.Count; i++)
{
view = listAdapter.GetView(i, view, listView);
if (i == 0)
view.LayoutParameters = new ViewGroup.LayoutParams(desiredWidth, WindowManagerLayoutParams.WrapContent);
//view.Measure(desiredWidth, MeasureSpecMode.Unspecified);
view.Measure(desiredWidth, 0);
totalHeight += view.MeasuredHeight;
}
// Add margin
totalHeight += Convert.ToInt32((float)(listAdapter.Count - 1) * marginBetweenItems);
if (listView is ListView)
{
// Add divider
totalHeight += (((ListView)listView).DividerHeight * (listAdapter.Count - 1));
}
if (listView is GridView)
{
// Consider multiple columns
var columns = ((GridView)listView).NumColumns;
var denominator = listAdapter.Count / columns;
var singleItemHeight = totalHeight / listAdapter.Count;
totalHeight = totalHeight / columns;
if (listAdapter.Count % denominator != 0)
totalHeight += singleItemHeight / 2;
}
ViewGroup.LayoutParams p = listView.LayoutParameters;
p.Height = totalHeight;
listView.LayoutParameters = p;
}
async public void OnScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount)
{
if (Master.SwipeRefreshLayout != null)
{
int topRowVerticalPosition = (Master.ListView == null || Master.ListView.ChildCount == 0) ? 0 : Master.ListView.GetChildAt(0).Top;
Master.SwipeRefreshLayout.Enabled = (firstVisibleItem == 0 && topRowVerticalPosition >= 0);
}
if (firstVisibleItem + visibleItemCount == Master.GetTableItemCount() && Master.GetTableItemCount() != 0)
{
if (!Master.Fetching)
{
Master.Fetching = true;
Master.ToggleProgressBarInFooter(true);
Master.Offset = Master.GetTableItemCount();
await Master.FetchTableData();
}
}
}
public void OnScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount)
{
System.Diagnostics.Debug.WriteLine(firstVisibleItem);
if (firstVisibleItem + visibleItemCount == totalItemCount) { // Clear items, add from current half way to chunk size after last item, scroll back to old last item
var firstItem = adapter.GetItem(chunksize);
adapter.Clear ();
for (int i = 0; i < chunksize*2; i++) {
adapter.Add(firstItem.AddDays (i));
}
adapter.NotifyDataSetChanged ();
view.SetSelection (chunksize-visibleItemCount-1);
}
else if (firstVisibleItem == 0) { // Clear items, add from chunk size before first item, scroll back to old first item
var lastItem = adapter.GetItem(chunksize);
adapter.Clear ();
for (int i = chunksize*2-1; i >= 0; i--) {
adapter.Add(lastItem.AddDays (-i));
}
adapter.NotifyDataSetChanged ();
view.SetSelection (chunksize-1);
}
}
void Android.Widget.AbsListView.IOnScrollListener.OnScroll(Android.Widget.AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount)
{
//throw new System.NotImplementedException ();
}
public void OnScroll (AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount)
{
if (isBtnAllSelected) {
iCurrentPosAll = firstVisibleItem;
} else {
iCurrentPosCompleted = firstVisibleItem;
}
}
public void OnScrollStateChanged (AbsListView view, ScrollState scrollState)
{
Enabled = scrollState != ScrollState.TouchScroll;
}
public void OnScroll (AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount)
{
}
void AbsListView.IOnScrollListener.OnScrollStateChanged (AbsListView view, ScrollState scrollState)
{
if (scrollState == ScrollState.Idle) {
UpdateChildrenControlPoints(0);
}
}
void AbsListView.IOnScrollListener.OnScroll (AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount)
{ }
static void n_SetAdapter_Landroid_widget_ListAdapter_(IntPtr jnienv, IntPtr native__this, IntPtr native_adapter)
{
AbsListView __this = Java.Lang.Object.GetObject <Android.Widget.AbsListView> (jnienv, native__this, JniHandleOwnership.DoNotTransfer);
__this.Adapter = Java.Interop.JavaConvert.FromJniHandle <IListAdapter> (native_adapter, JniHandleOwnership.DoNotTransfer);
}
public void OnScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount)
{
if (OverScrollCanceled != null)
OverScrollCanceled ();
}
public void OnScrollStateChanged(AbsListView view, int scrollState)
{
ScrollStateChanged.Invoke(view, new ScrollStateChangedEventArgs((ScrollState)scrollState));
}
public void OnScrollStateChanged(AbsListView view, ScrollState scrollState)
{
mCurrentScrollState = scrollState;
if (mCurrentScrollState == ScrollState.Idle)
{
mBounceHack = false;
}
if (mOnScrollListener != null)
{
mOnScrollListener.OnScrollStateChanged(view, scrollState);
}
}
public void OnScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount)
{
Scroll.Invoke(view, new ScrollEventArgs(firstVisibleItem, visibleItemCount, totalItemCount));
}
private bool CanScrollUp(Android.Views.View view)
{
if (!RefreshView.IsPullToRefreshEnabled)
{
return(true);
}
else
{
ViewGroup viewGroup = view as ViewGroup;
if (viewGroup == null)
{
return(base.CanChildScrollUp());
}
int sdk = (int)global::Android.OS.Build.VERSION.SdkInt;
if (sdk >= 16)
{
//
//is a scroll container such as listview, scroll view, gridview
//
if (viewGroup.IsScrollContainer)
{
return(base.CanChildScrollUp());
}
}
//
//if you have something custom and you can't scroll up you might need to enable this
//for instance on a custom recycler view where the code above isn't working!
//
for (int i = 0; i < viewGroup.ChildCount; i++)
{
var child = viewGroup.GetChildAt(i);
if (child is Android.Widget.AbsListView)
{
Android.Widget.AbsListView list = child as Android.Widget.AbsListView;
if (list != null)
{
if (list.FirstVisiblePosition == 0)
{
Android.Views.View subChild = list.GetChildAt(0);
return(subChild != null && subChild.Top != 0);
}
//
//if children are in list and we are scrolled a bit... sure you can scroll up
//
return(true);
}
}
else if (child is Android.Widget.ScrollView)
{
Android.Widget.ScrollView scrollview = child as Android.Widget.ScrollView;
return(scrollview.ScrollY <= 0.0);
}
else if (child is Android.Webkit.WebView)
{
Android.Webkit.WebView webView = child as Android.Webkit.WebView;
return(webView.ScrollY > 0.0);
}
else if (child is Android.Support.V4.Widget.SwipeRefreshLayout)
{
return(CanScrollUp(child as ViewGroup));
}
//
//else if something else like a recycler view?
//
}
return(false);
}
}
public void OnScrollStateChanged(AbsListView view, ScrollState scrollState)
{
}
public void setAbsListView(AbsListView absListView)
{
setListViewWrapper(new AbsListViewWrapper(absListView));
}
public void OnScrollStateChanged(AbsListView view, ScrollState scrollState)
{
if (OverScrollCanceled != null
&& (scrollState == ScrollState.Idle || scrollState == ScrollState.Fling))
OverScrollCanceled ();
}
