Error Scroll Panel class

[Eoeo]

I made a test

static oPanel
Function Main()
Local oPanel,oBrush,oWnd
DEFINE BRUSH oBrush FILENAME "mare.bmp"
DEFINE WINDOW oWnd
oPanel:= TScrollPanel():New(40,2,400,400,oWnd)
oPanel:SetBrush(oBrush)
oWnd:oclient:=oPanel
ACTIVATE WINDOW oWnd maximized

Return nil



let me give this error

Code: Select all  Expand view

Application
===========
   Path and name: C:\Work\Errori\ScrollPanel\test.Exe (32 bits)
   Size: 1,816,576 bytes
   Compiler version: xHarbour build 1.2.1 Intl. (SimpLex) (Rev. 6715)
   FiveWin  Version: FWHX 12.03
   Windows version: 6.1, Build 7600

   Time from start: 0 hours 0 mins 1 secs
   Error occurred at: 08/02/12, 15:26:16
   Error description: Error BASE/1004  Class: 'NIL' has no exported method: NTOP
   Args:
     [   1] = U  

Stack Calls
===========
   Called from:  => NTOP( 0 )
   Called from: .\source\classes\SCRLPANL.PRG => (b)TSCROLLPANEL:TSCROLLPANEL( 46 )
   Called from:  => TSCROLLPANEL:GOTOP( 0 )
   Called from: .\source\classes\SCRLPANL.PRG => TSCROLLPANEL:VSCROLL( 295 )
   Called from:  => TWINDOW:HANDLEEVENT( 0 )
   Called from: .\source\classes\CONTROL.PRG => TSCROLLPANEL:HANDLEEVENT( 1700 )
   Called from: .\source\classes\WINDOW.PRG => _FWH( 3153 )
   Called from:  => DIALOGBOXINDIRECT( 0 )
   Called from: .\source\classes\DIALOG.PRG => TDIALOG:ACTIVATE( 270 )
   Called from: .\source\function\ERRSYSW.PRG => ERRORDIALOG( 426 )
   Called from: .\source\function\ERRSYSW.PRG => (b)ERRORSYS( 31 )
   Called from:  => NTOP( 0 )
   Called from: .\source\classes\SCRLPANL.PRG => TSCROLLPANEL:VSETPOS( 190 )
   Called from: .\source\classes\SCRLPANL.PRG => TSCROLLPANEL:RESIZE( 119 )
   Called from:  => TWINDOW:HANDLEEVENT( 0 )
   Called from: .\source\classes\CONTROL.PRG => TSCROLLPANEL:HANDLEEVENT( 1700 )
   Called from: .\source\classes\WINDOW.PRG => _FWH( 3153 )
   Called from:  => WNDHEIGHT( 0 )
   Called from: .\source\classes\CONTROL.PRG => (b)TCONTROL:TCONTROL( 192 )
   Called from:  => TSCROLLPANEL:_NHEIGHT( 0 )
   Called from: .\source\classes\SCRLPANL.PRG => TSCROLLPANEL:CHECKRESIZE( 140 )
   Called from: .\source\classes\SCRLPANL.PRG => (b)TSCROLLPANEL:NEW( 110 )
   Called from: .\source\classes\WINDOW.PRG => TWINDOW:RESIZE( 2134 )
   Called from:  => TWINDOW:HANDLEEVENT( 0 )
   Called from: .\source\classes\WINDOW.PRG => _FWH( 3153 )
   Called from:  => SHOWWINDOW( 0 )
   Called from: .\source\classes\WINDOW.PRG => TWINDOW:ACTIVATE( 963 )
   Called from: test.prg => MAIN( 21 )

[Eoeo]

Any solution ?

[James Bott]

Eoeo,

You can't use the oWnd object until it is actually initialized in ACTIVATE WINDOW. Try the code below:

James

Code: Select all  Expand view

#include "fivewin.ch"


Function Main()
   Local oPanel,oBrush,oWnd
   DEFINE BRUSH oBrush FILENAME "mare.bmp"
   DEFINE WINDOW oWnd
   ACTIVATE WINDOW oWnd maximized on init(oBrush,oPanel)
Return nil

function createPanel(oBrush,oPanel)
   oPanel:= TScrollPanel():New(40,2,400,400,WndMain())
   oPanel:SetBrush(oBrush)
   WndMain():oClient:=oPanel
return nil
 

[nageswaragunupudi]

The scroll panel should have atleast one control.
Real use of scroll panel is when the controls in the panel exceed the height of the panel/window.

After creating the scroll panel, you should create atleast one control in the panel and after creating all controls it is necessary that you should call oPanel:SetRange().

Your program modified looks like this:

Code: Select all  Expand view

static oPanel

Function Main()

Local oPanel,oBrush,oWnd, C := 'HELLO'

   DEFINE BRUSH oBrush FILENAME "clouds1.bmp"
   DEFINE WINDOW oWnd
   oPanel:= TScrollPanel():New(40,2,400,400,oWnd)
   oPanel:SetBrush(oBrush)
   @ 10,10 GET C OF oPanel SIZE 100,20 PIXEL
   oPanel:SetRange()

//   oWnd:oclient:=oPanel
   ACTIVATE WINDOW oWnd maximized

Return nil
 

Real use of scroll panel is only when you have many controls exceeding the height of the scroll panel.