Announcement

**Keith Waters** · 12 Jul 2001, 11:18 AM

I've just noticed that QHTM does respond to the mouse wheel on my
home machine. I also note that MsWheel is running on this machine
but not, I presume, on my office machine. That must explain the
difference. But I still have the problem of enabling mouse wheel
scrolling in my application when its on a system that does not have
MsWheel running.

Thanks,
Keith

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**Semen Matusovski** · 12 Jul 2001, 12:27 PM

Keith --
Try this. On my PC (Win2000 SP2) I was not able to use PgUp/PgDn also and I used super-class.
Can't understand, why scrolling messages come to first window.
Bug in my code ? Don't see.

BTW, about bugs - see "third party add-ons"...
Unf., not a big choice - similar dll is actually a good idea.

Code:

   #Compile Exe
   #Register None
   #Dim All
   #Include "Win32Api.Inc"
   
   $TestHtm = "Test.htm"

    '----QHTM declares -----------------

   $QHTM_CLASSNAME = "QHTM_Window_Class_001"
   
   ' Zoom constants, minimum, maximum And default.
   %QHTM_ZOOM_MIN     = 0
   %QHTM_ZOOM_MAX     = 4
   %QHTM_ZOOM_DEFAULT = 2

   Type tagNMQHTM
      hdr As NMHDR
      pcszLinkText As Asciiz Ptr
      resReturnValue As Long
   End Type

    ' Sent whenever a link is clicked.
    ' Set resReturnValue to FALSE To prevent QHTM From starting the user agent associated with the link
    ' This would be used if you had encoded some of your own links To internal functions In the HTML
    %QHTMN_HYPERLINK = 1

    ' Load a HTML Page From the resources
    ' SendMessage hwnd, %QHTM_LOAD_FROM_RESOURCE, hInst, Name
    %QHTM_LOAD_FROM_RESOURCE = %WM_USER + 1

    ' Load the HTML From a file on disk.
    ' SendMessage hwnd, %QHTM_LOAD_FROM_FILE, 0, pcszName
    %QHTM_LOAD_FROM_FILE = %WM_USER + 2

    'Sets an Option - see the values QHTM_OPT_* For further information
    ' SendMessage hwnd, %QHTM_SET_OPTION, nOptionIndex, OptionValue
    %QHTM_SET_OPTION = %WM_USER + 3

    ' Gets an Option - see the values QHTM_OPT_* For further information
    ' OptionValue = SendMessage(hwnd, %QHTM_GET_OPTION, nOptionIndex, 0)
    %QHTM_GET_OPTION = %WM_USER + 4

    ' Goto a link with the HTML control. Used when you want to display a HTML document
    ' not from the start but at a named section within the document.
    ' SendMessage hwnd, %QHTM_GOTO_LINK, 0, pcszLinkName
    %QHTM_GOTO_LINK = %WM_USER + 5

    ' Get and set the scroll position of the control.
    %QHTM_GET_SCROLL_POS = %WM_USER + 6
    %QHTM_SET_SCROLL_POS = %WM_USER + 7

    ' Get the title length From the HTML document
    ' SendMessage hwnd, %QHTM_SET_HTML_TITLE, nBufferLength, pszBuffer
    ' returns the number of characters To store the title.
    %QHTM_GET_HTML_TITLE_LENGTH = %WM_USER + 8

    ' Get the title From the HTML document
    ' SendMessage hwnd, %QHTM_SET_HTML_TITLE, nBufferLength, pszBuffer
    ' No return value
    %QHTM_GET_HTML_TITLE = %WM_USER + 9

    ' Set/Get the HTML tooltips state.
    ' SendMessage hwnd, %QHTM_SET_OPTION, %QHTM_OPT_TOOLTIPS, bEnable
    %QHTM_OPT_TOOLTIPS = 1
    ' SendMessage hwnd, %QHTM_SET_OPTION, %QHTM_OPT_ZOOMLEVEL, nLevel
    ' nLevel can be between QHTM_ZOOM_MIN And QHTM_ZOOM_MAX defined above
    %QHTM_OPT_ZOOMLEVEL = 2


    ' Call this to initialise the Quick HTML control.
    Declare Function QHTM_Initialize Lib "qhtmlight.dll" Alias "QHTM_Initialize" _
       (ByVal hInst As Dword) As Long

    ' Enable coolTips in an application that currently uses the Win32 tool tip control.
    Declare Function QHTM_EnableCooltips Lib "qhtmlight.dll" Alias "QHTM_EnableCooltips" _
       () As Long

    ' Call this To Create a New Print context Using a zoom level
    Declare Function QHTM_PrintCreateContext Lib "qhtmlight.dll" Alias "QHTM_PrintCreateContext" _
       (ByVal uZoomLevel As Dword) As Dword

    ' Call this To destroy a Print context
    Declare Function QHTM_PrintDestroyContext Lib "qhtmlight.dll" Alias "QHTM_PrintDestroyContext" _
       (ByVal Dword) As Long

    'Call this To Set the HTML
    Declare Function QHTM_PrintSetText Lib "qhtmlight.dll" Alias "QHTM_PrintSetText" _
       (ByVal ctx As Dword, pcszText As Asciiz) As Long

    ' Call this To Set the HTML ftom a file
    Declare Function QHTM_PrintSetTextFile Lib "qhtmlight.dll" Alias "QHTM_PrintSetTextFile" _
       (ByVal ctx As Dword, pcszFilename As Asciiz) As Long

    ' Call this To Set the HTML ftom a resource
    Declare Function QHTM_PrintSetTextResource Lib "qhtmlight.dll" Alias "QHTM_PrintSetTextResource" _
       (ByVal ctx As Dword, ByVal hInst As Dword, pcszName As Asciiz) As Long

    ' Call this To layout the HTML. Returns the number of pages In nPages
    Declare Function QHTM_PrintLayout Lib "qhtmlight.dll" Alias "QHTM_PrintLayout" _
       (ByVal ctx As Dword, ByVal dc As Dword, pRect As RECT, nPages As Long) As Long

    ' Call To Print a Page of the HTML To a dc
    Declare Function QHTM_PrintPage  Lib "qhtmlight.dll" Alias "QHTM_PrintPage" _
       (ByVal ctx As Dword, hDC As Dword, ByVal nPage As Dword, prDest As RECT) As Long

    ' Using a zoom level
    Declare Function QHTM_PrintGetHTMLHeight Lib "qhtmlight.dll" Alias "QHTM_PrintGetHTMLHeight" _
       (ByVal hDC As Dword, pcszText As Asciiz, ByVal nMaxWidth As Long, ByVal uZoomLevel As Dword) As Long

    ' Set where QHTM gets it's resources for the hand cursor and the "no image" image. Maybe more later.
    Declare Sub QHTM_SetResources Lib "qhtmlight.dll" Alias "QHTM_SetResources" _
       (ByVal hInst As Dword, ByVal uArrowCursorID As Dword, ByVal uNoImageBitmapID As Dword)

    '----End of QHTM declares -------------------------------------------

    Function CreateSuperClass(OldClassName As String, NewClassName As String, lpfnNewWndProc As Long, cbWndExtra As Long) As Long
       Local wc As WNDCLASSEX
       wc.cbSize = SizeOf(wc)
       If GetClassInfoEx(ByVal GetModuleHandle(""), ByVal StrPtr(OldClassName), wc) Then
          CallWindowProc lpfnNewWndProc, 0, 0, wc.lpfnWndProc, wc.cbWndExtra
          wc.hInstance = GetModuleHandle(ByVal 0&)
          wc.lpszClassName = StrPtr(NewClassName)
          wc.lpfnWndProc = lpfnNewWndProc
          wc.cbWndExtra = wc.cbWndExtra + cbWndExtra
          Function = RegisterClassEx(wc)
       End If
   End Function

    CallBack Function QHTML_Proc
       Static OldProc As Long, OffsetWndExtra As Long
       If CbHndl = 0 Then OldProc = CbWparam: OffsetWndExtra = CbLparam: Exit Function
       SetWindowText GetParent(CbHndl), "hWnd = " + Str$(CbHndl)
       Select Case CbMsg
         Case %WM_KEYDOWN
            Select Case CbWparam
               Case %VK_PGDN: PostMessage CbHndl, %WM_VSCROLL, %SB_PAGEDOWN, 0
               Case %VK_PGUP: SendMessage CbHndl, %WM_VSCROLL, %SB_PAGEUP, 0
               Case %VK_DOWN: SendMessage CbHndl, %WM_VSCROLL, %SB_LINEDOWN, 0
               Case %VK_UP  : SendMessage CbHndl, %WM_VSCROLL, %SB_LINEUP, 0
            End Select
            Exit Function
         Case %WM_MOUSEWHEEL
            If GetSystemMetrics(%SM_MOUSEWHEELPRESENT) Then
               Dim j As Integer
               j = HiWrd(CbWparam)
               If (LoWrd(CbWparam) And %MK_MBUTTON) = %MK_MBUTTON Then ' If middle button is pushed - fast scrolling
                  If j > 0 Then SendMessage CbHndl, %WM_VSCROLL, %SB_PAGEDOWN, 0 Else _
                                SendMessage CbHndl, %WM_VSCROLL, %SB_PAGEUP, 0
               Else
                  If j > 0 Then SendMessage CbHndl, %WM_VSCROLL,  %SB_LINEDOWN, 0 Else _
                                SendMessage CbHndl, %WM_VSCROLL,  %SB_LINEUP,   0
               End If
           End If
           Exit Function
      End Select
      Function = CallWindowProc(OldProc, CbHndl, CbMsg, CbWparam, CbLparam)
   End Function

   %ID_QHTM1 = 101
   %ID_QHTM2 = 102

   CallBack Function DlgProc
       Dim txt As Static String, sHtmlFile As String, i As Long
       Select Case CbMsg
          Case %WM_INITDIALOG
             QHTM_Initialize GetModuleHandle("")
             CreateSuperClass $QHTM_CLASSNAME, "QHTML", CodePtr(QHTML_Proc), 4
             
             Control Add "QHTML", CbHndl, %ID_QHTM1, "", 10, 10, 400, 160,%WS_TABSTOP Or %WS_VISIBLE Or %WS_CHILD,%WS_EX_CLIENTEDGE
             Control Add "QHTML", CbHndl, %ID_QHTM2, "", 10, 180, 400, 80, %WS_TABSTOP Or %WS_VISIBLE Or %WS_CHILD,%WS_EX_CLIENTEDGE
             Control Add Button, CbHndl,  %IDOK, "Nothing", 110, 270, 200, 15
             
             txt = "<body bgcolor=#00FF00>"
             For i = 2 To 7
                txt = txt + "<font size=" + Format$(i) + " face=Verdana>Size=" + Format$(i) + "<br>" + $CRLF
             Next
             For i = 10 To 36 Step 2
                txt = txt + "<font size=" + Format$(i) + "pt face=Verdana>Size=" + Format$(i) + "pt<br>" + $CRLF
             Next

             SetWindowText GetDlgItem(CbHndl, %ID_QHTM2), ByVal StrPtr(txt)

             sHtmlFile = $TestHtm
             SendDlgItemMessage CbHndl, %ID_QHTM1,%QHTM_LOAD_FROM_FILE, 0, StrPtr(sHtmlFile)

          Case %WM_NOTIFY
             Dim pNMQHTM As tagNMQHTM Ptr
             If CbCtl= %ID_QHTM1 Then
                pNMQHTM = CbLparam
                If @pNMQHTM.hdr.code =%QHTMN_HYPERLINK Then
                   MsgBox @[email protected]
                   @pNMQHTM.resReturnValue = 0
                End If
             End If
       End Select
    End Function

    Function PbMain
      Dim hDlg As Long, Msg As tagMsg
      Dialog New 0, "QHTM test" ,,, 420, 300,%WS_CAPTION Or %WS_SYSMENU To hDlg
      Dialog Show Modal hDlg Call DlgProc
    End Function

------------------
E-MAIL: [email protected]

[This message has been edited by Semen Matusovski (edited July 13, 2001).]

**Paul Noble** · 12 Jul 2001, 12:27 PM

Hi Keith,

'Fraid the mouse wheel is beyond my ken at the moment, but I tried a quick test using
table widths as percentages, and wasn't able to reproduce the problem (although it's
obviously occurring).

Pending an answer from Russ, the workaround that comes to mind is to just refresh the
QHTM window on receipt of a WM_SYSCOMMAND \ SC_RESTORE. With the page sizes I've used
to date, a refresh is instantaneous/flicker-free.

There's a QHTM_Refresh() procedure in the include file at
http://www.gipsysoft.com/qhtm/using/...sic/PBQHTM.inc .

- Paul

**Keith Waters** · 13 Jul 2001, 11:57 AM

Semen

You never cease to amaze me. Some one posts a problem and you promptly supply code. I will study your code and I am sure it will help me a lot. Many thanks.

Paul

I'd suspected there must be a refresh procedure but I've never been able to find it and I could not find it in the link you gave. Anyway, I appreciate you replying.

Actually, I've got round the problem another way. I need tables in which the content does not wrap. Since QHTM does not support the nowrap attribute I've inserted unbroken strings of the underscore character in one row of the table to forcible impose a limiting minimum column width.

BTW I think I will be purchasing the full QHTM soon. There are problems with it, of course, but it is such an excellent control. I hope Russ can continue to support and develop it.

Keith

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

**Paul Noble** · 13 Jul 2001, 03:28 PM

Keith,

Ooops, sorry for that, I thought I'd put it in there . Anyway, here it is -

Code:

sub QHTM_Refresh( byval hQHTM as long )
 
  'Purpose : Causes the QHTM window to be re-drawn
  '
  'Remarks : If the QHTM window moves from a state where it is using one or more scrollbars to
  '          a state where a scroll bar is unneeded, junk gets displayed in the vacated scroll
  '          bar area. It was noticed that this is always cured by a manual resize of the QHTM 
  '          window, so this procedure just emulates that.
  '
  '          Later : fixed in newer versions of the control
  '
  local uRect  as RECT
  local HiPart as long
  local LoPart as long
 
  GetClientRect hQHTM, uRect
  HiPart = uRect.nBottom - uRect.nTop
  LoPart = uRect.nRight - uRect.nLeft
 
  SendMessage hQHTM, %WM_SIZE, %SIZE_RESTORED, MAKDWD( LoPart, HiPart )
 
  InvalidateRect hQHTM, byval %NULL, %TRUE
  UpdateWindow hQHTM
 
end sub

Just a thought - have you tried 'non-breaking space' characters in place of underscores to prevent wrapping ?
(All attempts to include the character here failed miserably - I must brush up on my UBB code !)

>I hope Russ can continue to support and develop it

From what I can gather, he's working pretty much full-time on it, certainly at the moment. He's
very enthused about it. I've had a good look at the competition over the last couple of years, and
for me as a PowerBASIC developer, QHTM is by far the best option. If by chance you use Delphi or
C++ Builder, there is an excellent (but comparatively weighty) alternative at http://www.pbear.com

Regards,

Paul

[This message has been edited by Paul Noble (edited July 13, 2001).]

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