Auto-Panning Windows

It implements an MFC extension class that adds IntelliMouse panning to CScrollView or any window with scroll bars. There is already one example of this in circulation (George Shepherd and Scot Wingo at MSJ Dec97) but the implementation is quite weak. Their version caused lots of flickering, incorrect paintings etc. So I wrote my own auto-panning windows extention.

As part of the IntelliMouse specification, a variety of cursors defined to be used in IntelliMouse panning. When a user clicks the mouse wheel / middle mouse button to initiate scrolling or moves the cursor back to the neutral zone (the area around the panning origin), one of three standard cursors appears, telling the user what level of panning support is provided.

Auto-Panning Windows Example imageIndicates when two-dimensional panning is supported.
Auto-Panning Windows Example imageIndicates that vertical-only, one-dimensional panning is available.
Auto-Panning Windows Example imageIndicates that horizontal-only, one-dimensional panning is available.

This is achieved through creating only one addition control named CWheelWnd. The control is very simple. It creates a floating popup window over the scrolling window, and controls the movements of the scrolling window until presses mouse wheel button. To add this functionality to your CScrollView based window or any other scrolling window add the following code to your OnMButtonDown function.
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);
    }
}

Also, given resources must be included to the project with given IDs.

 
Resource	ID
--------------  -------------
autopan.bmp	IDC_AUTOPAN
pan_up.cur	IDC_PAN_UP
pan_down.cur	IDC_PAN_DOWN
pan_left.cur	IDC_PAN_LEFT
pan_right.cur	IDC_PAN_RIGHT
Happy Scrolling :)

Download demo project - 38KB

Download source - 4.9KB

Date Posted: 5/6/98
Posted by: Pat Laplante.



Comments

  • There are no comments yet. Be the first to comment!

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  • Your email address will not be published.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.

  • Traditional approaches to application modernization, either manual rewrite or auto-migration tools, have been proven time and again as inefficient. Rewrite needs scarce dev skills, is slow, risky and costly; auto-migration is what Verccio Dale of Gartner defines as "a pig with a lipstick, is still a pig." Are there alternatives? Find out, download this short practical guide now!

Most Popular Programming Stories

More for Developers

RSS Feeds

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