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

  • Hurricane Sandy was one of the most destructive natural disasters that the United States has ever experienced. Read this success story to learn how Datto protected its partners and their customers with proactive business continuity planning, heroic employee efforts, and the right mix of technology and support. With storm surges over 12 feet, winds that exceeded 90 mph, and a diameter spanning more than 900 miles, Sandy resulted in power outages to approximately 7.5 million people, and caused an estimated $50 …

  • The impact of a data loss event can be significant. Real-time data is essential to remaining competitive. Many companies can no longer afford to rely on a truck arriving each day to take backup tapes offsite. For most companies, a cloud backup and recovery solution will eliminate, or significantly reduce, IT resources related to the mundane task of backup and allow your resources to be redeployed to more strategic projects. The cloud - can now be comfortable for you – with 100% recovery from anywhere all …

Most Popular Programming Stories

More for Developers

Latest Developer Headlines

RSS Feeds