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xCustomListView v1.50 adds an important new event named VisibleRangeChanged. This event is fired whenever the visible range of items changes. We can use this event to defer the items creation. This can significantly improve the performance of lists with complex items. As an example, if we try to c
link: Hi All, I have an issue with this example, it works great with several items, but after a second reload with just one item result, it shows nothing an
link: lang.reflect.Method.invoke(Method.java:515) at anywheresoftware.b4a.BA.raiseEvent2(BA.java:186) at anywheresoftware.b4a.BA$1.run(BA.java:325)

Step #1: Add the items with PCLV.AddItem. You need to pass the item size (height for vertical lists and width for horizontal lists), background color and value. Value can be any object you like including complex custom types that hold all the data needed to later build the layout. Step #2: Call PCL
link: No. The relevant line is this one: For Each i As Int In PCLV.VisibleRangeChanged(FirstIndex, LastIndex) PCLV.VisibleRangeChanged returns the indices
link: I have a little concern about VisibleRangeChange event if we have 10 visible items (0..9) and user scrolled 1 item down now the visible range will be
link: Sub (FirstIndex As Int, LastIndex As Int) 'Log("Now") For Each i As Int In PCLV.VisibleRangeChanged(FirstIndex, LastIndex) Dim item A

This class extends xCustomListView library and adds more selection modes: MODE_SINGLE_ITEM_TEMP - The same as the default behavior. MODE_SINGLE_ITEM_PERMANENT - Single item is selected and the selection remains. MODE_MULTIPLE_ITEMS- Multiple items can be selected. There is also a helper method tha

Non si può sfruttare l'evento: _VisibleRangeChanged (FirstIndex As Int, LastIndex As Int) ? (Non ho scaricato quell'esempio né quello di Erel).

- V1.50 - Large update. VisibleRangeChanged event. With this event it is possible to show longer lists with complex items: https://www.b4x.com/android/forum/threads/b4x-xui-customlistview-lazy-loading-virtualization.87930/ FindIndexFromOffset - quickly finds the index of the item in the specified i
link: is it possible to use VisibleRangeChanged event to reuse the views in runtime instead of creating and removing these? ( similar to the way recycle vie
link: When panel becomes in visible range I would want to resize height, but now it produces error. Sub CLV1_VisibleRangeChanged (FirstIndex As Int, LastIn

SMM was built to work with B4XPages. You will lose functionality in non-B4XPages projects. I've added a note about it in the tutorial. See SMM_Example2. There is a call for MediaManager.TrimMediaCache. It also explains why it is required. If it doesn't solve this issue then please create a B4XPages
link: Hi @Erel thank you for your reply. Unfortunately, even if you insert MediaManager.TrimMediaCache or replicate the example on B4Xpages, the effect do
link: I was doing some tests on SSM, I entered the load of a hundred items using VisibleRangeChanged. I have this code: Sub clv_VisibleRangeChanged (First

- A custom type is used to store all of the relevant information for each item. - The important code is in the VisibleRangeChanged event: Sub (FirstIndex As Int, LastIndex As Int) For i = 0 To CustomListView1.Size - 1 Dim cd As CellData = CustomListView1.GetValue(i) Dim pnl As B4X

ASGallery Author: Alexander Stolte Version: 1.03 ASGallery Events: PreviewClick (path As String, isImage As Boolean) Functions: Class_Globals As String CreateFileAndTime (Name As String, Time As Long, dir As String) As FileAndTime CreateMyImageData (IndexOfFirstImage As Int, lst_image_filename

Works if I implement lazy loading in this way, just as it is in the tutorial: Sub (FirstIndex As Int, LastIndex As Int) Dim ExtraSize As Int = 20 For i = 0 To ServicesLV.Size - 1 Dim p As B4XView = ServicesLV.GetPanel(i) If i > FirstIndex - ExtraSize And i < LastIndex + Extr
link: Hi Alex, Have you tried the project? i add more items on ReachEnd, the problem is not there, is when scrolling some visible items disappear and reapp
link: Text="Item 2" PubImg2.Bitmap=LoadBitmapResize(File.DirAssets, "sample2.webp",200dip,200dip,True) Catch

GetBase.Tag For Each i As Int In PCLVs(j).VisibleRangeChanged(FirstIndex, LastIndex) Dim item As CLVItem = clv.GetRawListItem(i) Dim pnl As B4XView = xui.CreatePanel("") item.Panel.AddView(pnl, 0, 0, item.Panel.Width, item.Panel.Height) pnl.LoadLayout("Item"

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