B4J Question scrollpane headache.

gruizelgruis · Jan 5, 2016

Hello all.

After finishing my B4a app. I am looking into B4J to create a new application.

I like to create a hospitality table reservation program. It should have the same layout as google calander. With names on the Y-ax and time on the x-ax. And be able to scroll in both directions.

I have been trying to get my head around this scrollpane, but i'm pulling my hair out at this point.

I like to add an object (button / label or "pane with a layout") to the scrollpane.
This object has a fixed hight and a variable width. At a fixed starting point.

The scrollpane must be able to scroll in both directions.

Is there an example i can use ?
is there a better way/object to use ?

Here is a bit off code i'm strugeling with. It should add a button at the clicked position.

B4X:

Sub Process_Globals
    Private fx As JFX
    Private MainForm As Form
   
    Dim Sp As ScrollPane
    Dim pnl As Pane
   
End Sub

Sub AppStart (Form1 As Form, Args() As String)
   
    MainForm = Form1
    MainForm.SetFormStyle("UNIFIED")
    MainForm.RootPane.LoadLayout("LT1") 'Load the layout file.
    MainForm.Show
      
    Sp.Initialize("Sp") '// the scrollpanel as created on the layout "LT1"
   
    pnl = Sp.InnerNode  '// A pane as an innernode ? ( i assume its a panel inside a scrollpanel)
    pnl.Initialize("Pnl")
   
End Sub


Sub pn_MouseClicked (EventData As MouseEvent)

    Dim CmdReservering As Button 
   
    CmdReservering.Initialize("CmdReservering")

    pnl.AddNode(CmdReservering,EventData.X,EventData.y,100dip,100dip)

End Sub

Please advice.

eurojam · Jan 5, 2016

Hi,
usually you will load a layout into your scrollpane, something like this:

B4X:

    sp.LoadLayout("myLayout", -1, 800)
    'and set the scroll visibility
    sp.SetVScrollVisibility("AS_NEEDED")
    sp.SetHScrollVisibility("NEVER")

in this case a layout (with buttons, webviews and whatever...) will be loaded into the scrollpane with a width which will fit (=-1) and a hight of let's say 800.
Then the scroll visibility will be set to horizontal never - because it fits - and verticaly as needed.

hope this helps a bit...if not, may be aspirin will help

gruizelgruis · Jan 5, 2016

Thank you for your quick responce.
I sure will try this to get a better feel for scrollpane.
But I do need to be able to add/remove items. I dont think that can be done with a "layout"

eurojam · Jan 5, 2016

May be this goes more in that direction:

B4X:

Sub Process_Globals
    Private fx As JFX
    Private MainForm As Form
End Sub

Sub AppStart (Form1 As Form, Args() As String)
    MainForm = Form1
    MainForm.SetFormStyle("UNIFIED")
    'MainForm.RootPane.LoadLayout("Layout1") 'Load the layout file.
   
    Dim sp As ScrollPane
    sp.Initialize("Scrollpane")
    MainForm.RootPane.AddNode( sp,0,0,MainForm.Width,MainForm.Height)

    sp.SetVScrollVisibility("ALWAYS")
    sp.SetHScrollVisibility("ALWAYS")   
    Dim p As Pane
    p.Initialize("p")
  
    sp.InnerNode = p
    sp.InnerNode.SetSize(1000,1000)
   

    For i = 0 To 5
      Dim b As Button
      b.Initialize("b")
      p.AddNode(b,100*i,100*i,100,100)
    Next
   
    MainForm.Show
End Sub

gruizelgruis · Jan 5, 2016

Super!.. thanks.
For some reason it does not allow this with a pre-defined scrollpane on a layout.
And i feel it has to do with the

B4X:

sp.Initialize("Scrollpane")

When using a layout, the initialization is not needed.
But this

B4X:

Dim p AsPane
 p.Initialize("p")
 
 sp.InnerNode = p

Bit needs the scrollpane to be initialization first.

So when initializing a scrollpane that exists on a layout seems to lose its connection to the code.
And the whole thing does not work.

Just my 2 cents

Thanks again.

B4J Question scrollpane headache.

gruizelgruis

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eurojam

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gruizelgruis

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eurojam

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