B4J Code Snippet [B4X][DSE] Designer Script Extensions - Scaling Preserving Aspect Ratio

I have been experimenting with DSE.

Just a small change in @Erel 's Numpad example can preserve aspect ratio.

https://www.b4x.com/android/forum/threads/b4x-dse-designer-script-extensions.141312/post-895879

(I also put lower and upper limits on text scaling)

Sub Class_Globals
    Private Root As B4XView
    Private xui As XUI
    Private PresetValues As Map
    Private dd As DDD
   
    Private fillProp As Float
End Sub

Public Sub Initialize
End Sub

Private Sub B4XPage_Created (Root1 As B4XView)
    Root = Root1
    xui.RegisterDesignerClass(Me)
    dd.Initialize
    xui.RegisterDesignerClass(dd)

    fillProp = .5
    PresetValues.Initialize
    Root.LoadLayout("Numpad")
End Sub

Private Sub ScaleNumpad(DesignerArgs As DesignerArgs)
    If DesignerArgs.FirstRun Then
        For Each view As B4XView In DesignerArgs.Views
            PresetValues.Put(view, Array As Int(view.Left, view.Top, view.Width, view.Height, IIf(view Is Button, view.TextSize, 0)))
        Next
    End If
    Dim MainParent As B4XView = dd.GetViewByName(DesignerArgs.Parent, "Pane1")
    Dim MainPreset() As Int = PresetValues.Get(MainParent)
    If DesignerArgs.ParentWidth < 5 Or DesignerArgs.ParentHeight < 5 Then Return
    Dim ScaleX As Float = DesignerArgs.ParentWidth / MainPreset(2)
    Dim ScaleY As Float = DesignerArgs.ParentHeight / MainPreset(3)
    Dim Scale As Float = Min(ScaleX, ScaleY) * fillProp
    'If Scale > 1.5 Then Scale = 1.5         'Can also set upper limit on upscaling - really big buttons look ugly
    Dim w As Float = MainPreset(2) * Scale
    Dim h As Float = MainPreset(3) * Scale
   
    MainParent.SetLayoutAnimated(0, Root.Width / 2 - w /2, Root.Height / 2 - h / 2, w, h)
    For i = 0 To MainParent.NumberOfViews - 1
        Dim btn As B4XView = MainParent.GetView(i)
        Dim preset() As Int = PresetValues.Get(btn)
        btn.SetLayoutAnimated(0, preset(0) * Scale, preset(1) * Scale, preset(2) * Scale, preset(3) * Scale)
        btn.TextSize = Max(12, Min(30, preset(4) * Scale))        'prevent text from getting too small or too big
    Next

End Sub