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use full 32 bit range when dragging a scrollbar (fixes bug 414986)

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git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_2_4_BRANCH@17280 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
This commit is contained in:
Vadim Zeitlin
2002-09-19 20:07:13 +00:00
parent 8f37ed893c
commit 72d490511c
1 changed files with 42 additions and 11 deletions
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53
src/msw/scrolbar.cpp
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@@ -122,9 +122,40 @@ wxScrollBar::~wxScrollBar(void)
bool wxScrollBar::MSWOnScroll(int WXUNUSED(orientation), WXWORD wParam,
WXWORD pos, WXHWND control)
{
int position = ::GetScrollPos((HWND) control, SB_CTL);
int minPos, maxPos;
::GetScrollRange((HWND) control, SB_CTL, &minPos, &maxPos);
// current and max positions
int position,
maxPos;
#ifdef __WIN32__
// when we're dragging the scrollbar we can't use pos parameter because it
// is limited to 16 bits
if ( wParam == SB_THUMBPOSITION || wParam == SB_THUMBTRACK )
{
SCROLLINFO scrollInfo;
wxZeroMemory(scrollInfo);
scrollInfo.cbSize = sizeof(SCROLLINFO);
// also get the range if we call GetScrollInfo() anyhow -- this is less
// expensive than call it once here and then call GetScrollRange()
// below
scrollInfo.fMask = SIF_RANGE | SIF_POS | SIF_TRACKPOS;
if ( !::GetScrollInfo(GetHwnd(), SB_CTL, &scrollInfo) )
{
wxLogLastError(_T("GetScrollInfo"));
}
pos = scrollInfo.nTrackPos;
position = scrollInfo.nPos;
maxPos = scrollInfo.nMax;
}
else
#endif // Win32
{
position = ::GetScrollPos((HWND) control, SB_CTL);
int minPos;
::GetScrollRange((HWND) control, SB_CTL, &minPos, &maxPos);
}
#if defined(__WIN95__)
// A page size greater than one has the effect of reducing the effective
@@ -217,16 +248,16 @@ bool wxScrollBar::MSWOnScroll(int WXUNUSED(orientation), WXWORD wParam,
void wxScrollBar::SetThumbPosition(int viewStart)
{
#if defined(__WIN95__)
SCROLLINFO info;
info.cbSize = sizeof(SCROLLINFO);
info.nPage = 0;
info.nMin = 0;
info.nPos = viewStart;
info.fMask = SIF_POS ;
SCROLLINFO info;
info.cbSize = sizeof(SCROLLINFO);
info.nPage = 0;
info.nMin = 0;
info.nPos = viewStart;
info.fMask = SIF_POS ;
::SetScrollInfo((HWND) GetHWND(), SB_CTL, &info, TRUE);
::SetScrollInfo((HWND) GetHWND(), SB_CTL, &info, TRUE);
#else
::SetScrollPos((HWND) GetHWND(), SB_CTL, viewStart, TRUE);
::SetScrollPos((HWND) GetHWND(), SB_CTL, viewStart, TRUE);
#endif
}