Auto Scrolling a Single Line PropertySheet Tab Control

Environment: all versions of windows. VC6, Win32.

When using property sheets with a large number of pages (for whatever reason) and where there is limited space available, it is often useful to use the single line version. This displays a spin control on the tab control to allow the user to scroll the various tabs into view.

The problem: When the user needs to scroll left they must continually go over to the spin control that is normally on the right hand side to scroll the tabs and then return to select the page they need.

A solution: The technique I present below gets around this problem by automatically scrolling the tabs by one when the selected tab is on the edge thus bringing the next tab into view. There may be more elegant ways to solve this but this gives you the gist.

This solution was developed primarily for use on a maximised property sheet whilst using a PocketPC, on these devices it is not possible to use the Ctrl+Tab and Ctrl+Shift+Tab keyboard shortcuts. The solution though applies equally to desktop solutions.

The PostMessage parameters were determined by using Spy++ on the msctls_updown32 window.

HWND hTabCtrl = NULL;
HWND hWndSpin = NULL;

// Call this function whenever a propertsheet page 
// receives a PSN_SETACTIVE notification:

void AutoScroll(HWND hWndMain)
{
   if(hTabCtrl)
   {
      int iItem;
      RECT rItemRect,rWindow;
     
      GetWindowRect(hWndMain,&rWindow);
     
      iItem = TabCtrl_GetCurSel(hTabCtrl);
      TabCtrl_GetItemRect(hTabCtrl,iItem,&rItemRect);

      if(rItemRect.left < 10)
      {
         PostMessage(hWndSpin,WM_LBUTTONDOWN,1,0x9000A);
         PostMessage(hWndSpin,WM_LBUTTONUP,1,0xD000D);
      }
     
      if(rItemRect.right > rWindow.right-40)
      {
         PostMessage(hWndSpin,WM_LBUTTONDOWN,1,0x70016);
         PostMessage(hWndSpin,WM_LBUTTONUP,1,0x6001B);
      }
   }
}

// Add this code snippet to your property sheet initialisation:

   case PSCB_INITIALIZED:
   {
      // Find the hWnd for the spin control on the tab control

      TCHAR classname[100];

      hTabCtrl = PropSheet_GetTabControl(hWndDlg);

      HWND hWndFind = GetWindow(hTabCtrl,GW_HWNDFIRST);

      while(hWndFind)
      {
         GetClassName(hWndFind,classname,100);

         if(lstrcmp(_T("SysTabControl32"),classname) == 0)
            hWndFind = GetWindow(hWndFind,GW_CHILD);
         else if(lstrcmp(_T("msctls_updown32"),classname) == 0)
         {
            hWndSpin = hWndFind;
            break;
         }
         else
            hWndFind = GetWindow(hWndFind,GW_HWNDNEXT);
     };
  }


Comments

  • Do you have a demo project?

    Posted by Legacy on 11/13/2002 12:00am

    Originally posted by: Danielle

    ?

    Please let me know. My email address is brinasas@yahoo.com

    Reply
Leave a Comment
  • Your email address will not be published. All fields are required.

Top White Papers and Webcasts

  • When it comes to desktops – physical or virtual – it's all about the applications. Cloud-hosted virtual desktops are growing fast because you get local data center-class security and 24x7 access with the complete personalization and flexibility of your own desktop. Organizations make five common mistakes when it comes to planning and implementing their application management strategy. This eBook tells you what they are and how to avoid them, and offers real-life case studies on customers who didn't let …

  • The exponential growth of data, along with virtualization, is bringing a disruptive level of complexity to your IT infrastructure. Having multiple point solutions for data protection is not the answer, as it adds to the chaos and impedes on your ability to deliver consistent SLAs. Read this white paper to learn how a more holistic view of the infrastructure can help you to unify the data protection schemas by properly evaluating your business needs in order to gain a thorough understanding of the applications …

Most Popular Programming Stories

More for Developers

Latest Developer Headlines

RSS Feeds