B4A Library [B4X] [XUI] AS ViewPager based on xCustomListView

Hey,
thanks to @KZero for his good zPager class, i was able to extract a few things from it to make this cross platform view.

I spend a lot of time in creating views, some views i need by my self, but some views not and to create a high quality view cost a lot of time. If you want to support me, then you can do it here by Paypal or with a coffee. :)

This library is compatible and tested with B4A,B4I and B4J!
If you have bugs or a wish then tell me it in the comments.

On B4J use the LEFT and RIGHT keys on your keyboard to change the page.
On B4I you need the GestureRecognizer class. Download it down below.
B4j: jXUI,JavaObject,xCustomListView,jReflection
B4a: XUi,Reflection,xCustomListView
B4i: iXUI,xCustomListView
Features
  • cross-platform compatible
  • based on a cross-platform ListView
  • add and remove pages
  • scroll to pages
  • a good swipe feeling
  • NEW - Vertical
  • NEW - Carousel
  • NEW - Lazy Loading
Horizontal and Vertical
20-04-22-20-36-012.gif
20-08-15-11-33-40.gif

B4A Carousel and B4I Carousel
B4A Carousel.gif
B4I Carousel.gif

ASViewPager
Author: Alexander Stolte
Version: 1.32

  • ASViewPager
    • Events:
      • LazyLoadingAddContent (Parent As B4XView, Value As Object)
      • PageChange (Index As Int)
      • PageChanged (Index As Int)
      • PageClick (Index As Int, Value As Object)
      • ReachEnd
      • ScrollChanged (Offset As Int)
      • TouchBegin
      • TouchEnd
    • Fields:
      • Tag As Object
    • Functions:
      • AddPage (xpnl_layout As B4XView, value As Object) As String
      • AddPageAt (index As Int, xpnl_layout As B4XView, value As Object) As String
        Adds an page at a special position
      • Base_Resize (Width As Double, Height As Double) As String
      • Class_Globals As String
      • Clear As String
      • DesignerCreateView (Base As Object, Lbl As Label, Props As Map) As String
        Base type must be Object
      • getBase As B4XView
      • getCurrentIndex As Int
      • getCustomListView As b4a.example3.customlistview
      • getisScrollEnabled As Boolean
        Checks if the swipe/scroll is enabled or disabled
      • getSize As Int
      • Initialize (Callback As Object, EventName As String) As String
      • IsInitialized As Boolean
        Tests whether the object has been initialized.
      • NextPage As String
      • NextPage2 As String
        Jump to next page
      • PreviousPage As String
      • PreviousPage2 As String
        jump to previous page
      • RemovePage (index As Int) As String
      • Scroll2Value (Value As String) As String
        sets the current index by the value - smooth scrolls to the item
      • Scroll2Value2 (Value As String) As String
        sets the current index by the value - jumps to the item
      • setCurrentIndex (index As Int) As String
      • setCurrentIndex2 (index As Int) As String
        sets the current index - jumps to the item
      • setIgnorePageChangedEvent (ignore As Boolean) As String
      • setIgnorePageChangeEvent (ignore As Boolean) As String
      • setScroll (enabled As Boolean) As String
        B4I and B4A only
        enabled - False the scroll is deactivated
    • Properties:
      • Base As B4XView [read only]
      • CurrentIndex As Int
      • CurrentIndex2
        sets the current index - jumps to the item
      • CustomListView As b4a.example3.customlistview [read only]
      • IgnorePageChangedEvent
      • IgnorePageChangeEvent
      • isScrollEnabled As Boolean [read only]
        Checks if the swipe/scroll is enabled or disabled
      • Scroll
        B4I and B4A only
        enabled - False the scroll is deactivated
      • Size As Int [read only]
Changelog
  • 1.00
    • Release
  • 1.01
    • Base_Resize is now public
    • NextPage and PreviousPage Bug Fix
    • setCurrentIndex Bug Fix
    • PageChangeEvent Bug Fix
  • 1.02
    • B4I Bug Fixes
    • NextPage and PreviousPage Bug Fix
  • 1.03
    • Resize BugFix
  • 1.04
    • B4I Page-Height BugFix
    • B4I Page-Swipe BugFix
  • 1.05
    • BugFix
  • 1.06
    • Add Designer Property "Orientation" - Vertical is now supported
  • 1.07
    • BugFix getCurrentIndex
    • BugFix PageChanged event is now only firing if the index is changed
    • Add setIgnorePageChangedEvent Property
    • Add TouchBegin Event
    • Add TouchEnd Event
    • BugFix PageChanged is now firing if you press on a emulator, for example the arrow up or down keys on yor keyboard
  • 1.08
  • 1.09
    • B4I BugFixes for Release Mode - swiping is now better
  • 1.10
    • Add AddPageAt (experimental it works for my need, if you have issuses, then tell me) - Adds an page at a special position
    • Add set CurrentIndex2 - sets the current index - jumps to the item
    • Better resize handling
  • 1.11
    • RemovePage Bugfixes
    • B4J ScrollPane under the hood is now Transparent
    • Add NextPage2 -Jump to next page
    • Add PrevoiusPage2 - Jump to previous page
  • 1.12
    • [BETA] Add DesignerProperty Carousel - infinite swipe
      • On B4I Bounce Effect is disabled
    • B4I ScrollView Paging is now activated, this can improve the handling
  • 1.13
    • Add PageClick Event
  • 1.14 - read more about this update here
    • [B4I only] Add Scroll - enable or disable scroll with finger
      • ASViewPager1.Scroll(False)'disable scroll with finger
  • 1.15
    • Intern Function IIF renamed to iif2
  • 1.16
    • set Scroll is now B4X - disable the swipe/scroll
      • In B4J the arrow keys (Left/Right/Up/Down) are disabled if you deactivate the swipe/scroll
    • New property isScrollEnabled - checks if the swipe/scroll is enabled or disabled
    • Intern Function iif2 removed and the core iif is now used
      • B4A V11+ - B4J V9.10+ - B4I V7.50+
  • 1.18
    • PageChanged Event is now firing in some cases with a delay, because of a scroll animation
    • BugFix B4A setScroll - Events from other views are now no longer blocked
  • 1.19
    • BugFix on NextPage and PreviousPage
  • 1.20 (read more about this update)
    • Add Event PageChange - This event is triggered immediately after the page is changed, no delay because of animations
    • Add setIgnorePageChangeEvent - prevents the PageChange event from being triggered
  • 1.21
    • BugFixes
  • 1.22
    • B4I Scroll = False BugFix
  • 1.24
    • BugFix AddPageAt is now working better on B4A
  • 1.25
    • Add Scroll2Value - sets the current index by the value - smooth scrolls to the item
      • from the AddPage and AddPageAt function the "Value" property
      • must be a string to be found
    • Add Scroll2Value2 - sets the current index by the value - jump to the item
  • 1.26 (read more about this update)
    • Add Designer Property LazyLoading - activates lazy loading
      • Default: False
    • Add Designer Property LazyLoadingExtraSize - How many pages to load in advance
      • Default: 5
    • Add Event LazyLoadingAddContent - Add here your layout or views
  • 1.27
    • Add get and set LazyLoadingExtraSize
  • 1.28
    • Important LazyLoading improvments
  • 1.29
    • Add Commit - Triggers the LazyLoadingAddContent event
      • Call this after you have filled the list
    • LazyLoading BugFixes
  • 1.30
    • Add ResetLazyloadingIndex - when you call "commit" afterwards, it is guaranteed to check if there are empty panels in the lazy loading range, if so, the LazyLoading event is triggered
  • 1.31
    • important resize improvments
    • Add Loading Panel if Base_Resize is calling
    • Add Designer Property LoadingPanelColor
    • Add set IgnoreLazyLoading - If True, the Lazy Loading event is not triggered
    • Add ResetLazyLoadingPanels - Removes all child views from all visible pages
    • LazyLoading Improvments
  • 1.32
    • Carousel works now in Vertical mode
  • 1.33
    • B4I Native paging is now used
      • The paging feels smoother now
      • In debug mode, the swiping should now also run better
  • 1.34
    • B4I The GestureRecognizer is no longer needed
Have Fun :)
 

Attachments

  • B4X Example.zip
    9.9 KB · Views: 740
  • GestureRecognizer.bas
    11.2 KB · Views: 463
  • 1.30 Backup ASViewPager.b4xlib
    5.7 KB · Views: 108
  • ASViewPager.b4xlib
    7.5 KB · Views: 181
Last edited:

Alexander Stolte

Expert
Licensed User
but between Last and First Page and vice versa its a instant screenjump instead of scrolling, is this correct?
Thats correct, because its not possible to get to the first page from the last page, without scroll back to the other pages. And if I used smooth scroll, you would always see that you are thrown back.

it does not work in vertical mode.
i'll check
 

Alexander Stolte

Expert
Licensed User
Update
  • 1.33
    • B4I Native paging is now used
      • The paging feels smoother now
      • In debug mode, the swiping should now also run better
Swiping feels much better now in B4I :)

I have tested the changes in ASScheduler and ASCalendarAdvanced and have not seen any bugs related to the new paging.
 
Last edited:

Alexander Stolte

Expert
Licensed User
does this mean that GestureRecognizer is not needed anymore?
Haha, no :p

I was looking forward to it, but then I saw that I have 2 events (TouchDown and TouchUp) and 1 function (Carousel) that only work with gestures...
But maybe I'll manage to put the functions I need into the class of GestureRecognizer. I had tried that before, but it never worked.
 

Alessandro71

Active Member
Licensed User
Update
  • 1.31
    • Add Designer Property LoadingPanelColor
how do I revert to the old behavior?
while on B4A, I get a nice fade-in effect, from black to the actual layout, on B4i the effect is not so pleasant: the full layout appears immediately and the goes black and fades in again
as a workaround I set LoadingPanelColor to Transparent
 

Alexander Stolte

Expert
Licensed User
The loading panel is shown when the Base_Resize event is triggered, when the ViewPager is loaded the panel is shown until the Base_Resize event is triggered the 1st time.

In B4A this will happen only 1 time automatically, because there is no B4XPage_Resize event where the page is resized, unless you resize the view in the code.

Since I don't know how you integrated the ASViewPager into your project it's hard to say, I would guess that the Base_Resize event is triggered several times.
 

Alessandro71

Active Member
Licensed User
Same code in B4A and B4i: no explicit calls to Base_Resize
I think it’s called by the system after LoadLayout
 

angel_

Well-Known Member
Licensed User
I have updated to the latest version (was v1.24 before) and loading the views shows a black screen for a short time, it happens in B4A and B4i.
 
Last edited:

Alexander Stolte

Expert
Licensed User
I have updated to the latest version (was v1.24 before) and loading the views shows a black screen for a short time, it happens in B4A and B4i.
10 versions. Thats hard :D
Yes this is a deliberate behavior, the black should be smooth when disappearing. If you want it to hide completely, just set the "LoadingPanelColor" property in the designer to transparent.
 
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