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Add XP Style Scrollbar to listctrl, listbox and so on (by self-draw)

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8 Mar 2005CPOL 179.3K   1.9K   21   15
Implement XP style scrollbar by self-draw
Sample Image - self-draw_XPScrollbar.jpg

Introduction

One of my recent projects needed to beautify UI, but when the app does not run on WinXP, the intrinsic scrollbar of common controls is too ugly. So I use self-draw CScrollWnd instead.

At present, only VSCROLL is supported. HSCROLL will be added when I have time to do it, and any help will be appreciated (you can add it by yourself).

Trick

The biggest problem to implement a scrollbar is to locate thumb properly. To solve this problem, I have used many ways, but at the end, a very convenient and reliable method was found: step by step approach.

Code

C++
void CScrollWnd::MoveThumb(CPoint ptOffset)

{ if(!IsMouseInRange(WM_VSCROLL))
  return;
 CPoint ptCursor;
 GetCursorPos(&ptCursor);
 ScreenToClient(&ptCursor); 

 CPoint ptCurPos = ptCursor;
 int nMaxTimes=200;

 int nTimes = 0;
 int nStep = 1;//accuracy

 CPoint ptNewPos = ptOffset + GetRect(HT_THUMB).CenterPoint();
 while(abs(ptNewPos.y - ptCurPos.y)>nStep && nTimes++<nMaxTimes)
 {
  BOOL bDirDown = ptCurPos.y>ptNewPos.y;
  NotifyBuddy(WM_VSCROLL,MAKEWPARAM(bDirDown?SB_LINEDOWN:SB_LINEUP,0));
  
  UpdateScrollBar();
  ptNewPos = ptOffset + GetRect(HT_THUMB).CenterPoint();
 }
}

See the attached source code for more details.

Sorry for my poor English. My mother tongue is Chinese. :)

History

  • 8th March, 2005: Initial post

License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)


Written By
xwp
Software Developer www.MayGion.com
China China
This member has not yet provided a Biography. Assume it's interesting and varied, and probably something to do with programming.

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