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FriendFeedPageCounter Object for ScrollViews
When scrolling in a document that consists of quite a lot pages it might
be helpful for the user to get an information which page of the document would be
displayed if he/she >would release to slider of the scrollbar at a certain position.
Microsoft Word has such a feature. It's a tooltip-like window that displays
the page number that corresponds to the current position of the slider
during scrolling.
I implemented a class named CScrollViewPageCounter that displays such a page number in a window that looks like a tooltip-window. If you have a look at the source code you'll find out that it was quite easy to implement. The code itself is self-explanatory...
HOW TO USE
To use the ScrollViewPageCounter-Object you have to perform the following steps:1. Add the files ScrollViewPageCounter.h and ScrollViewPageCounter.cpp to your project.
2. Add a new member m_pScrollViewPageCounter to your scroll view class.
CScrollViewPageCounter* m_pScrollViewPageCounter;Of course your have to include the corresponding header file here as well:
#include "ScrollViewPageCounter.h"
3. Create the page counter object in CYourScrollView::OnInitialUpdate()
BOOL CYourScrollView::PreCreateWindow(CREATESTRUCT& cs)
{
CScrollView::OnInitialUpdate();
// Instantiate the counter object
m_pScrollViewPageCounter = new CScrollViewPageCounter( this );
}
4. Add a command handler for the message WM_VSCROLL:
void CYourScrollView::OnVScroll(UINT SBCode, UINT nPos, CScrollBar* pScrollBar)
{
if ( nSBCode == SB_THUMBTRACK )
{
// calculate page number (insert your algorithm here)
UINT uiPageNumber = (UINT) (nPos / 10) + 1;
// display page number
m_pScrollViewPageCounter->DisplayPageNumber( uiPageNumber );
}
// when scrolling is finished we have to hide the page counter
if ( nSBCode == SB_ENDSCROLL )
m_pScrollViewPageCounter->Reset();
CScrollView::OnVScroll(nSBCode, nPos, pScrollBar);
}
That's it.Now compile and enjoy...
Date Last Updated: April 16, 1999
Comments
nPos only goes up to 32K
Posted by wadigzon on 03/04/2004 10:00pmyou've gotta use something like these in order to handle positions beyond 32K at ::OnVScroll(...) function. SCROLLINFO si; ZeroMemory(&si, sizeof(SCROLLINFO)); si.cbSize = sizeof(SCROLLINFO); // Call GetScrollInfo to get current tracking // position in si.nTrackPos if (!GetScrollInfo(SB_VERT, &si) ) { return ; // GetScrollInfo failed } // this is the Page number UINT uiPageNumber = (UINT)(si.nTrackPos/10)+1;ReplyThank you.
Posted by Legacy on 12/08/2003 12:00amOriginally posted by: NANA
Great. This is exactly I was looking for. I had to integrate this to CListCtrl and it works great. Thank you.
Reply
It looks nicer like this:
Posted by Legacy on 06/21/1999 12:00amOriginally posted by: Bruno Vais
I think it looks nicer if the yellow thing moves aside the mouse. So delete the "s_bFirstCallDuringScrolling" member.
ReplyAlso, during scrolling the main view loses focus (of course). To avoid showing that dumb grey caption, at the end of your "DisplayPageNumber" function call
"AfxGetMainWnd()->SendMessage(WM_NCACTIVATE,TRUE,0);".