Intellimouse panning 2 (A universal Auto-Panning solution)

This article improves on the code submitted by Umut Alev, Auto-Panning Windows.
This article also uses some code submitted by Lutz Kretzschmar, Intellimouse panning.
This article integrates some code submitted by Russel Freeman, Auto-Panning Windows 2.

How it looks like

Improvements made to original version

  • Modified behavior and look to match IE4.
  • Added continous subpixel scrolling adapted from Lutz.
  • Modified the speed calculation to use a faster acceleration when more than 42 pixel away from start region.
  • Added support for lots of Controls and Views
  • Added style flags to customize behavior
    • MFX_WHEELWNDSTYLE_ONEDIRECTION
      No diagonal panning.
    • MFX_WHEELWNDSTYLE_UPDOWNONLY/MFX_WHEELWNDSTYLE_LEFTRIGHTONLY
      Limit panning to either UP/DOWN or LEFT/RIGHT.
    • MFX_WHEELWNDSTYLE_NOSUBPIXELSCROLLING
      No continous subpixel scrolling.
  • Moved the Resources to a RecourceTemplate for a better handling.
  • Nearly every parameter is customizable through "CAutoPanParameters"-classes.
    • Provide a own Origin-Bitmap
    • Use your own Cursors
    • Directly scroll the window with your own functions
    • Or just replace the width of one scrolling-step...
  • Of course the code does compile without any Level 4 warning.

Currently supportet Views and Controls

  • CEditView
  • CFormView
  • CListView (all modes)
  • CRichEditView
  • CScrollView
  • CTreeView
  • ComboBox (different look&feel)
  • Edit
  • ListBox
  • ListCtrl (all modes)
  • SpinButton (different look&feel)
  • TreeCtrl

Using in a View - with macros


	void CAutoPanView::OnMButtonDown(UINT nFlags, CPoint point) 
	{
		CWheelWnd_OnMButtonDown(CScrollView);
	}
 

Using in a View - without macros


	void CAutoPanView::OnMButtonDown(UINT nFlags, CPoint point) 
	{
		BOOL bCtl = GetKeyState(VK_CONTROL) & 0x8000;
		if(!bCtl && nFlags == MK_MBUTTON)
		{
			MfxTrackAutoPan(this);
		}
		else
		{
			CScrollView::OnMButtonDown(nFlags, point);
		}
	}
 

Using in a CDialog - with macros


	void CAutopanDialog::OnMButtonDown(UINT nFlags, CPoint point) 
	{
		CWheelWnd_OnMButtonDown(CDialog);
	}

	BOOL CAutopanDialog::PreTranslateMessage(MSG* pMsg) 
	{
		CWheelWnd_PreTranslateMessage(CDialog);
	}
 

Using in a CDialog - without macros


	void CAutopanDialog::OnMButtonDown(UINT nFlags, CPoint point) 
	{
		BOOL bCtl = GetKeyState(VK_CONTROL) & 0x8000;
		if(!bCtl && nFlags == MK_MBUTTON)
		{
			CWnd* pWnd = WindowFromPoint(point);
			if (pWnd) MfxTrackAutoPan(pWnd);
			else CDialog::OnMButtonDown(nFlags, point);
		}
		else
		{
			CDialog::OnMButtonDown(nFlags, point);
		}
	}

	BOOL CAutopanDialog::PreTranslateMessage(MSG* pMsg) 
	{
		if (pMsg && pMsg->message==WM_MBUTTONDOWN)
		{
			OnMButtonDown(pMsg->wParam, CPoint(pMsg->pt));
			return TRUE;
		}
		else
		{
	 		return CDialog::PreTranslateMessage(pMsg);
		}
	}
 

Download source - 12KB

Download the three source files mfxWhlPan.h, mfxWhlPan.c and mfxWhlPan.inl and the new cursors in this ZIP file. You must download either Umats demo project - 38KB and replace the two files and the cursors - or use my extended demo project - 84KB. To have a quick look the executable - 63KB is also availible.

Last updated: 6 July 1998



Comments

  • Intellimouse panning 2 (A universal Auto-Panning solution)

    Posted by Legacy on 07/03/1999 12:00am

    Originally posted by: Michael Herstine

    Great code - just one small problem. If you use CAutoPanParametersMessage, it uses the SB_THUMBPOSITION parameter with the WM_HSCROLL/WM_VSCROLL messages. Unfortunately, CScrollView doesn't check for this; it checks for SB_THUMBTRACK (which causes a fall-through in their case statement, and no scrolling). I don't know if this is an oversight or intentional on the part of MFC, but changing lines 21 & 22 of mfxWhlPan.inl from:

    pParentWnd->SendMessage(WM_HSCROLL, MAKELONG(SB_THUMBPOSITION, nScrollToX), NULL);
    pParentWnd->SendMessage(WM_VSCROLL, MAKELONG(SB_THUMBPOSITION, nScrollToY), NULL);

    to

    pParentWnd->SendMessage(WM_HSCROLL, MAKELONG(SB_THUMBTRACK, nScrollToX), NULL);
    pParentWnd->SendMessage(WM_VSCROLL, MAKELONG(SB_THUMBTRACK, nScrollToY), NULL);

    will get things to work. Again, a really nice solution.

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

Top White Papers and Webcasts

  • When individual departments procure cloud service for their own use, they usually don't consider the hazardous organization-wide implications. Read this paper to learn best practices for setting up an internal, IT-based cloud brokerage function that service the entire organization. Find out how this approach enables you to retain top-down visibility and control of network security and manage the impact of cloud traffic on your WAN.

  • U.S. companies are desperately trying to recruit and hire skilled software engineers and developers, but there is simply not enough quality talent to go around. Tiempo Development is a nearshore software development company. Our headquarters are in AZ, but we are a pioneer and leader in outsourcing to Mexico, based on our three software development centers there. We have a proven process and we are experts at providing our customers with powerful solutions. We transform ideas into reality.

Most Popular Programming Stories

More for Developers

RSS Feeds

Thanks for your registration, follow us on our social networks to keep up-to-date