Android Code Snippet [B4X] TextInputBox

I needed a simple cross platform dialog (B4A, B4X, B4i) for entering alphabetic text.
I don't know if I wasted time and there is already something ready it's simpler than the one I'm about to publish (which could be written much better).

Depends on XUI Views.

V. 1.0.1 - Added a parameter, DefaultText.

' CaseType - Pass: "L" for Lower only, "U" for Upper only, "B" for Both.
' ExtraChars example: @$!%*?
'<code>
'    Wait For (TextInputBox("Name", "Erel" 3, 10, "B", "")) Complete(Name As String)
'    If Name.Length > 0 Then
'       Log("Name: " & Name)
'    Else
'       Log("Canceled")
'    End If
'</code>
Private Sub TextInputBox(Prompt As String, DefaultText As String, MinLength As Int, MaxLength As Int, CaseType As String, ExtraChars As String) As ResumableSub
    Dim ReturnedValue As String = ""

    Dim Dialog As B4XDialog
    Dialog.Initialize(Root)

    Dim InputTemplate As B4XInputTemplate
    InputTemplate.Initialize

    InputTemplate.lblTitle.Text = Prompt
    InputTemplate.Text = DefaultText

    Dim RegexPattern As String

    CaseType = CaseType.ToUpperCase
    Dim PatternLetterCase As String
    Select CaseType
        Case "L"
            PatternLetterCase = "a-z"
        Case "U"
            PatternLetterCase = "A-Z"
        Case "B"
            PatternLetterCase = "a-zA-Z"
    End Select

    If ExtraChars.Length > 0 Then
        ExtraChars = Regex.Replace("([a-zA-Z0-9])", ExtraChars, "")
        If ExtraChars.Length > 0 Then
            If Not(ExtraChars.StartsWith("\")) Then
                ExtraChars = "\" & ExtraChars
            End If
            PatternLetterCase = PatternLetterCase & ExtraChars
        End If
    End If

    RegexPattern = $"[${PatternLetterCase}]{${MinLength},${MaxLength}}"$

    InputTemplate.RegexPattern = RegexPattern

    Wait For (Dialog.ShowTemplate(InputTemplate, "OK", "", "CANCEL")) Complete (Result As Int)

    If Result = xui.DialogResponse_Positive Then
        ReturnedValue = InputTemplate.Text
    End If

    Return ReturnedValue
End Sub

Usage:

Private Sub Button1_Click
    Wait For (TextInputBox("Name", "Erel", 3, 10, "B", "")) Complete(Name As String)
    If Name.Length > 0 Then
        Log("Name: " & Name)
    Else
        Log("Canceled")
    End If
End Sub

 

[LucaMs]

I have to solve a problem: it does not accept accented letters.

EDIT: and to allow all "special" characters, like Cyrillic, Arabic, Chinese, ...? I don't know.