Edit Subclass Question

[Cecil Williams]

Hello to all,

The following post is from my ever ending battle to learn the text handling side of windows:

' -----------------------------------------------------------------------------

FUNCTION editSubclassProc(BYVAL hEdit AS LONG, _
                          BYVAL wMsg AS LONG, _
                          BYVAL wParam AS LONG, _
                          BYVAL lParam AS LONG) AS LONG

  LOCAL  fPassThru   AS LONG

  FUNCTION = %FALSE      'Initialize function to False

  SELECT CASE wMsg
    CASE %WM_LBUTTONUP, %WM_KEYUP
      updCaretPos2Sbar hEdit, ghStatus, 0, 0

    CASE %WM_CHAR
      '/* Pass the character message to default edit control procedure */
      CallWindowProc glpfnDefEditProc, hEdit, wMsg, wParam, lParam
      
      SELECT CASE wParam
        CASE 34                     'User typed a ", send matching "
          IF ISFALSE fPassThru THEN
            fPassThru = %TRUE                              'Prevent closed loop
            CallWindowProc glpfnDefEditProc, hEdit, wMsg, wParam, lParam
            '/* Move the caret back one space */
            'CallWindowProc glpfnDefEditProc, hEdit, %WM_KEYDOWN, %VK_LEFT, 0
          END IF

        CASE 40                     'User typed a (, send matching )
          CallWindowProc glpfnDefEditProc, hEdit, wMsg, 41, lParam
          'CallWindowProc glpfnDefEditProc, hEdit, %WM_KEYDOWN, %VK_LEFT, 0
          'PostMessage hEdit, %WM_KEYDOWN, %VK_LEFT, 0
          'SendMessage GetParent(hEdit), %WM_KEYDOWN, 0, 0
      END SELECT
      EXIT FUNCTION

    CASE %WM_CONTEXTMENU
      'EXIT FUNCTION

    CASE %WM_DESTROY
      SetWindowLong hEdit, %GWL_WNDPROC, glpfnDefEditProc   'Restore procedure

  END SELECT

  FUNCTION = CallWindowProc(glpfnDefEditProc, hEdit, wMsg, wParam, lParam)
END FUNCTION  'editSubclassProc

' -----------------------------------------------------------------------------

My question is, how do I simulate the VK_LEFT key from the soft end to get the same result from the keyboard. I've tried everything I could think of to get the caret to backup one space after the subclass function adds another character (ie "" and ()).

Passing the WM_KEYDOWN message does cause the caret to backup but the trailing character is highlighted.

Using the get/set caret functions also move the caret back but on the next char key down, the caret jumps over the inserted character inserted by the subclass function. Like it moved but the edit control didn't know about it????????

I've read till I'm blue in the face. HELP!!!

Cheers,
Cecil

[Cecil Williams]

Well I finally found what the problem was. One last search of MSDN revealed how to force an edit control to set the caret position. EM_SETSEL was the key.

' -----------------------------------------------------------------------------

FUNCTION editSubclassProc(BYVAL hEdit AS LONG, _
                          BYVAL wMsg AS LONG, _
                          BYVAL wParam AS LONG, _
                          BYVAL lParam AS LONG) AS LONG

  LOCAL  fPassThru   AS LONG, _
         iOffset     AS LONG
         
  FUNCTION = %FALSE      'Initialize function to False

  SELECT CASE wMsg
    CASE %WM_LBUTTONUP, %WM_KEYUP
      updCaretPos2Sbar hEdit, ghStatus, 0, 0

    CASE %WM_CHAR
      '/* Pass the character message to default edit control procedure */
      CallWindowProc glpfnDefEditProc, hEdit, wMsg, wParam, lParam
      '/* Get the caret location relative to last character entered */
      iOffset = HIWRD(Edit_GetSel(hEdit))
      
      SELECT CASE wParam
        CASE 34                     'User typed a ", send matching "
          IF ISFALSE fPassThru THEN
            fPassThru = %TRUE                              'Prevent closed loop
            CallWindowProc glpfnDefEditProc, hEdit, wMsg, wParam, lParam
            '/* Move the caret back one character */
            SendMessage hEdit, %EM_SETSEL, iOffset, iOffset
          END IF

        CASE 40                     'User typed a (, send matching )
          CallWindowProc glpfnDefEditProc, hEdit, wMsg, 41, lParam
          SendMessage hEdit, %EM_SETSEL, iOffset, iOffset
      END SELECT
      EXIT FUNCTION

    CASE %WM_CONTEXTMENU
      'EXIT FUNCTION

    CASE %WM_DESTROY
      SetWindowLong hEdit, %GWL_WNDPROC, glpfnDefEditProc   'Restore procedure

  END SELECT

  FUNCTION = CallWindowProc(glpfnDefEditProc, hEdit, wMsg, wParam, lParam)
END FUNCTION  'editSubclassProc

' -----------------------------------------------------------------------------

Cecil

------------------


[This message has been edited by Cecil Williams (edited March 16, 2000).]

[Semen Matusovski]

Cecil --
You can also imitate by KeyBd_Event
Small sample (based on Lance' code)
If to type the word "LEFT", cursor automatic moves to previous position (at first time only)

#Compile Exe
#Register None
#Include "WIN32API.INC"
Global hDlg&
Global gOldSubClassProc As Dword
Function SubClassProc(ByVal hWnd&, ByVal wMsg&, ByVal wParam&, ByVal lParam&) As Long
    Static Ex&
    Function = CallWindowProc(gOldSubClassProc, hWnd&, wMsg&, wParam&, lParam&)
    Control Get Text hDlg&, 102 To a$
    If UCase$(Right$(a$, 4)) = "LEFT" And Ex& = 0 Then
       KeyBd_Event %VK_LEFT, MapVirtualKey(%VK_LEFT, 0), 0, 0: Sleep 0
       KeyBd_Event %VK_LEFT, MapVirtualKey(%VK_LEFT, 0), %KEYEVENTF_KEYUP, 0: Sleep 0
       Ex& = 1
    End If
End Function
CallBack Function DlgCallBack
    Static hEdit&
    Select Case CbMsg
        Case %WM_INITDIALOG
            Control Handle CbHndl, 102 To hEdit&
            gOldSubClassProc = SetWindowLong(hEdit&, %GWL_WNDPROC, CodePtr(SubClassProc))
        Case %WM_DESTROY
            SetWindowLong hEdit&, %GWL_WNDPROC, gOldSubClassProc
    End Select
End Function
Function PbMain
    Dialog New 0, "Type left",,, 170, 100, %DS_CENTER Or %WS_SYSMENU To hDlg
    Control Add TextBox,  hDlg, 102, "", 10, 10, 150, 50, %ES_MULTILINE _
        Or %ES_WANTRETURN, %WS_EX_CLIENTEDGE
    Dialog Show Modal hDlg Call DlgCallBack
End Function

[This message has been edited by Semen Matusovski (edited March 16, 2000).]