Android Code Snippet [B4X] RaiseEventIfSubExists

When you create a custom view, you often add some events to it.
For example, the custom view I am preparing now has 3 events:

#Event: ElapsedTimeChanged(ElapsedTime As Long)
#Event: StateChanged(Paused As Boolean, ElapsedTime As Long)
#Event: Click(ElapsedTime As Long)

Writing code for each one would mean duplicating lines of code. This snippet (Sub) is useful in these cases.

Note that the mEventName variable is already declared in the custom views class model.

Private Sub RaiseEventIfSubExists(EventName As String, params As List)
    Dim FullSubName As String
    FullSubName = mEventName & "_" & EventName
    If xui.SubExists(mCallBack, FullSubName, params.Size) Then
        Select params.Size
            Case 0
                CallSub(mCallBack, FullSubName)
            Case 1
                CallSub2(mCallBack, FullSubName, params.Get(0))
            Case 2
                CallSub3(mCallBack, FullSubName, params.Get(0), params.Get(1))
        End Select
    End If
End Sub

Usage examples:

'Note the 2 parameters.
RaiseEventIfSubExists("StateChanged", Array(mPaused, getElapsedTime))
'1 parameter.
RaiseEventIfSubExists("Click", Array(getElapsedTime))

 

[Erel]

Change this line to:

If xui.SubExists(mCallBack, FullSubName, params.Size) Then

This way it will work with B4i as well.

 

[Mashiane]

Hey Fam!

My b4a app was crashing due to SubExists, so I went back to

[B4X] [XUI] Cross platform & native UI library

Update: The designer was updated since the tutorial was written. It is now possible to declare views as B4XView from the designer and it is also possible to copy and paste views between the three platforms. Video tutorial: The purpose of XUI library is to make it easier to share code between...

www.b4x.com

There is a quote from Erel that says...

For example SubExists in B4i expects another parameter (the number of arguments). XUI.SubExists adds this parameter. The parameter is not used in B4J and B4A.
It includes a DefaultFolder property as well as other useful methods.

THE PARAMETER IS NOT USED IN B4J and B4A...

#Food For Thought...

BackToDebuging.