B4i Library SD: ScratchCard


Licensed User
I created a new view / panel that simulates the effect of scratch cards.
Create a panel from code that design and you can hook other views that will be visible after the user has passed the finger on the surface.

It has all the properties of a panel and also returns the native panel.


Author: Star-Dust
Version: 0.01
  • PanelScratchCard
    • Events:
      • Click
      • LongClick
      • Touch (Action As Int, Coordinate As String)
    • Fields:
      • ACTION_DOWN As Int
      • ACTION_MOVE As Int
      • ACTION_UP As Int
      • thickness As Int
    • Functions:
      • AddToParent (Parent As B4IPanelWrapper*, Left As Int, Top As Int, Width As Int, Height As Int) As NSString*
      • AddView (View As B4IViewWrapper*, Left As Int, Top As Int, Width As Int, Height As Int) As NSString*
      • BringToFront As NSString*
      • CalcRelativeKeyboardHeight (KeyboardHeight As Double) As Double
      • Class_Globals As NSString*
      • DesignerCreateView (Base As B4IPanelWrapper*, Lbl As B4ILabelWrapper*, Props As B4IMap*) As NSString*
      • GetView (Index As Int) As B4IViewWrapper*
      • Initialize (ba As B4I*, Callback As NSObject*, EventName As NSString*) As NSString*
      • IsInitialized As BOOL
        Verifica se l'oggetto sia stato inizializzato.
      • LoadLayout (layoutFile As NSString*) As NSString*
      • Panel As B4IPanelWrapper*
      • RemoveAllViews As NSString*
      • RemoveViewFromParent As NSString*
      • RemoViewAt (Index As Int) As NSString*
      • RequestFocus As NSString*
      • ResignFocus As BOOL
      • Scartch (Enabled As BOOL) As NSString*
        Default is Enabled
      • SendToBack As NSString*
      • SetLayoutAnimated (Duration As Int, Left As Int, Top As Int, Width As Int, Height As Int) As NSString*
      • SetParallaxEffect (Vertical As Int, Horizzontal As Int) As NSString*
      • SetShadow (Color As Int, OffsetX As Float, OffsetY As Float, Opacity As Float, StaticRect As BOOL) As NSString*
      • SizeToFit As NSString*
    • Properties:
      • Alfa As Float
      • Color As Int
      • Height As Int
      • IsFocused As BOOL [read only]
      • Left As Int
      • Parent As B4IPanelWrapper* [read only]
      • Tag As NSObject*
      • TintColor As Int [read only]
      • TintiColor
      • Top As Int
      • Visible As BOOL
      • Width As Int

Sub Process_Globals
    'These global variables will be declared once when the application starts.
    'Public variables can be accessed from all modules.
    Public App As Application
    Public NavControl As NavigationController
    Private Page1 As Page

    Private PanelScratchCard1 As PanelScratchCard
End Sub

Private Sub Application_Start (Nav As NavigationController)
    'SetDebugAutoFlushLogs(True) 'Uncomment if program crashes before all logs are printed.
    NavControl = Nav
    Page1.Title = "Page 1"
    Page1.RootPanel.Color = Colors.White
End Sub

Sub PA_Touch (Action As Int, Coordinate As String)
    Dim C() As String = Regex.Split("|",Coordinate)
    Dim X As Int = C(0)
    Dim Y As Int = C(1)
End Sub


Last edited:


Active Member
Licensed User
Does it work with b4a ? is there a equivalent for that? I need to make a lottery like game where it is needed to scratch the card....