PureBasic Forums - English

Posted: **Fri Jan 02, 2026 6:54 pm**

Hello everyone.

The user asks to limit the number of characters in a line, but we only have what the OS offers (#PB_Editor_WordWrap). Unfortunately, this option is not suitable. I wish I could have this in real time ("on the fly"). For this I used the Axolotl code as a basis. But this is not as simple as it may seem at first glance. If anyone has time and desire, could you help me with this ?

This is my most primitive logic, which doesn’t work at all.

Code: Select all

Global col, row, old, lim = 9

Define evMask, i


Procedure Callback(hWnd, uMsg, wParam, lParam)
  Protected result
  Protected *msgf.MSGFILTER
  Protected POINT.POINT
  Protected char
  Protected lineindex
  Protected colindex
  ;Protected col
  ;Protected row
  
  Result = #PB_ProcessPureBasicEvents
  Select uMsg
      
    Case #WM_NOTIFY
      *msgf=lParam
      Select *msgf\NMHDR\code
        Case #EN_MSGFILTER   
          Select *msgf\msg
            Case #WM_LBUTTONUP, #WM_KEYDOWN
              GetCaretPos_(@POINT)
              char = SendMessage_(GadgetID(1), #EM_CHARFROMPOS, 0, @POINT)
              lineindex = SendMessage_(GadgetID(1), #EM_LINEFROMCHAR, char, 0)
              colindex = SendMessage_(GadgetID(1), #EM_LINEINDEX, lineindex, 0)
              col = char-colindex
              row = lineindex + 1

              Debug "(" + Str(col) + ", " + Str(row) + ")"
          EndSelect
      EndSelect
  EndSelect
  ProcedureReturn Result
EndProcedure

Procedure WndProc(hWnd, uMsg, wParam, lParam)
  Protected bs = #False, char = #False
  
  If uMsg = #WM_KEYDOWN
    If wParam >= 32 And wParam <= 125
      char = #True
    EndIf

    If wParam = #VK_BACK
      bs = #True
      If col = 0
        Debug "DEL STR / calculate position"
        col = Len(GetGadgetItemText(1, row-1))
      EndIf
    EndIf
    
    If col >= lim
      Debug "Character limit exceeded"
      If bs = #False And char = #True
        Debug "Set the carriage on a new line"
        AddGadgetItem(1, -1, "")
      EndIf
    EndIf

  EndIf
  
  ProcedureReturn CallWindowProc_(old, hWnd, uMsg, wParam, lParam)
EndProcedure



If OpenWindow(0, 0, 0, 550, 300, "Window", #PB_Window_SystemMenu | #PB_Window_ScreenCentered)
  If LoadFont(0, "consolas", 12)
    SetGadgetFont(#PB_Default, FontID(0))
  EndIf
  
  eWnd = EditorGadget(1, 10, 10, WindowWidth(0)-20, WindowHeight(0)-20);, #PB_Editor_WordWrap)
  SetActiveGadget(1) ;Focus auf den Editor
  
  evMask = SendMessage_(GadgetID(1), #EM_GETEVENTMASK, 0, 0)
  SendMessage_(eWnd, #EM_SETEVENTMASK, 0, evMask | #ENM_KEYEVENTS | #ENM_MOUSEEVENTS )
  SetWindowCallback(@Callback())
  
  old = SetWindowLongPtr_(eWnd, #GWLP_WNDPROC, @WndProc())

  AddWindowTimer(0, 1, 10)     ; Second solution 
  
  Repeat 
    Select WaitWindowEvent()
      Case #PB_Event_CloseWindow
        End
      Case #PB_Event_Timer  
        If EventTimer() = 1 
          If i < 40 
            SetGadgetText(1,GetGadgetText(1)+Str(i)+",")    
            i + 1 
          Else 
            RemoveWindowTimer(0, 1)
            AddGadgetItem(1, -1, "Abcdefghijk12345")
            col = Len(GetGadgetItemText(1, CountGadgetItems(1)-1))
          EndIf 
        EndIf 

    EndSelect
  ForEver
  RemoveWindowTimer(0, 1) 


EndIf

Posted: **Fri Jan 02, 2026 10:46 pm**

Maybe

Code: Select all

Global oldprocedure

Procedure editorGadgetCB(hwnd, uMsg, wParam, lParam)
  If uMsg = #WM_CHAR
    If wParam <> #VK_BACK
      If Len(GetGadgetText(0))%30 = 29
        keybd_event_(#VK_RETURN,0,0,0)
        keybd_event_(#VK_RETURN,0,#KEYEVENTF_KEYUP,0)
      EndIf
    EndIf
 
  EndIf
  ProcedureReturn CallWindowProc_(oldprocedure, hwnd, uMsg, wParam, lParam)
EndProcedure
 
OpenWindow(0, 0, 0, 300, 300, "30 char limit per line", #PB_Window_SystemMenu | #PB_Window_ScreenCentered)
EditorGadget(0, 5, 5, 290, 290, #ES_MULTILINE)
 
oldprocedure = SetWindowLongPtr_(GadgetID(0), #GWL_WNDPROC, @editorGadgetCB())
Repeat
  Select WaitWindowEvent(1)
    Case #PB_Event_CloseWindow
      Quit = 1
  EndSelect
Until Quit = 1

Posted: **Sat Jan 03, 2026 9:16 am**

Hello, RASHAD.

Thank you for your attempt. Unfortunately, this is not handled as a gadget with the #PB_Editor_WordWrap flag. This flag doesn't do the main thing I need, which is to limit the number of characters in a line. Indenting is not the way to go (margins). I added part of Axolotl code to give a visual indication of when it's time for "Line Feed". The user wants this to be automatic.

Select all the text in the editor and format it according to the conditions. Yes, this is an additional action (for user). This is probably the last thing I can do here.

I can't even imagine the logic of how this could be done. Use a dummy invisible gadget ? In my opinion, this will greatly complicate the algorithm. I also look at StringGadget with multiline input support. The problem is that in certain cases I also use coloring of incorrect letters in the editor. StringGadget probably can't do this.

Sorry if I didn't explain the problem well.

In other words, I was originally planning on using EditorGadget, but this extra requirement with the character limit... ruins it.

PureBasic Forums - English

Editor - once again about word wrap

Editor - once again about word wrap

Re: Editor - once again about word wrap

Re: Editor - once again about word wrap