BOOL CScrollWnd::OnScrollBy(CSize sizeScroll, BOOL bDoScroll)
{
int xOrig, x;
int yOrig, y;
// don't scroll if there is no valid scroll range (ie. no scroll bar)
CScrollBar* pBar;
DWORD dwStyle = GetStyle();
pBar = GetScrollBarCtrl(SB_VERT);
if ((pBar != NULL && !pBar->IsWindowEnabled()) ||
(pBar == NULL && !(dwStyle & WS_VSCROLL)))
{
// vertical scroll bar not enabled
sizeScroll.cy = 0;
}
pBar = GetScrollBarCtrl(SB_HORZ);
if ((pBar != NULL && !pBar->IsWindowEnabled()) ||
(pBar == NULL && !(dwStyle & WS_HSCROLL)))
{
// horizontal scroll bar not enabled
sizeScroll.cx = 0;
}
// adjust current x position
xOrig = x = GetScrollPos(SB_HORZ);
int xMax = GetScrollLimit(SB_HORZ);
x += sizeScroll.cx;
if (x < 0)
x = 0;
else if (x > xMax)
x = xMax;
// adjust current y position
yOrig = y = GetScrollPos(SB_VERT);
int yMax = GetScrollLimit(SB_VERT);
y += sizeScroll.cy;
if (y < 0)
y = 0;
else if (y > yMax)
y = yMax;
// did anything change?
if (x == xOrig && y == yOrig)
return FALSE;
if (bDoScroll)
{
// do scroll and update scroll positions
ScrollWindow(-(x-xOrig), -(y-yOrig));
//Invalidate();
if (x != xOrig)
SetScrollPos(SB_HORZ, x);
if (y != yOrig)
SetScrollPos(SB_VERT, y);
}
return TRUE;
}
BOOL CXTPPropertyPage::DoMouseWheel(UINT fFlags, short zDelta, CPoint point)
{
UNUSED_ALWAYS(point);
UNUSED_ALWAYS(fFlags);
// if we have a vertical scroll bar, the wheel scrolls that
// if we have _only_ a horizontal scroll bar, the wheel scrolls that
// otherwise, don't do any work at all
DWORD dwStyle = GetStyle();
CScrollBar* pBar = GetScrollBarCtrl(SB_VERT);
BOOL bHasVertBar = ((pBar != NULL) && pBar->IsWindowEnabled()) ||
(dwStyle & WS_VSCROLL);
pBar = GetScrollBarCtrl(SB_HORZ);
BOOL bHasHorzBar = ((pBar != NULL) && pBar->IsWindowEnabled()) ||
(dwStyle & WS_HSCROLL);
if (!bHasVertBar && !bHasHorzBar)
return FALSE;
BOOL bResult = FALSE;
UINT uWheelScrollLines = 3;
if (bHasVertBar)
{
bResult = OnScrollBy(CSize(0, (zDelta < 0 ? 1 : -1) * m_lineDev.cy * uWheelScrollLines), TRUE);
}
else if (bHasHorzBar)
{
bResult = OnScrollBy(CSize((zDelta < 0 ? 1 : -1) * m_lineDev.cy * uWheelScrollLines, 0), TRUE);
}
if (bResult)
UpdateWindow();
return bResult;
}
bool CAutoPanParameters::NoHorzScroll(CWnd* pParentWnd) const
{
DWORD dwStyle = pParentWnd->GetStyle();
CScrollBar* pSBar = pParentWnd->GetScrollBarCtrl(SB_HORZ);
INT MinPos, MaxPos;
pParentWnd->GetScrollRange(SB_HORZ, &MinPos, &MaxPos);
if (pParentWnd->GetScrollLimit(SB_HORZ) == 0) return true;
if (MinPos == MaxPos) return true;
if (pSBar != NULL && !pSBar->IsWindowEnabled()) return true;
return false;
}
BOOL CScrollWnd::DoMouseWheel(UINT fFlags, short zDelta, CPoint point)
{
UNUSED_ALWAYS(point);
UNUSED_ALWAYS(fFlags);
// if we have a vertical scroll bar, the wheel scrolls that
// if we have _only_ a horizontal scroll bar, the wheel scrolls that
// otherwise, don't do any work at all
DWORD dwStyle = GetStyle();
CScrollBar* pBar = GetScrollBarCtrl(SB_VERT);
BOOL bHasVertBar = ((pBar != NULL) && pBar->IsWindowEnabled()) ||
(dwStyle & WS_VSCROLL);
pBar = GetScrollBarCtrl(SB_HORZ);
BOOL bHasHorzBar = ((pBar != NULL) && pBar->IsWindowEnabled()) ||
(dwStyle & WS_HSCROLL);
if (!bHasVertBar && !bHasHorzBar)
return FALSE;
BOOL bResult = FALSE;
UINT uWheelScrollLines = 10;//_AfxGetMouseScrollLines();
int nToScroll;
int nDisplacement;
if (bHasVertBar)
{
nToScroll = ::MulDiv(-zDelta, uWheelScrollLines, WHEEL_DELTA);
if (nToScroll == -1 || uWheelScrollLines == WHEEL_PAGESCROLL)
{
nDisplacement = m_pageDev.cy;
if (zDelta > 0)
nDisplacement = -nDisplacement;
}
else
{
nDisplacement = nToScroll * m_lineDev.cy;
nDisplacement = min(nDisplacement, m_pageDev.cy);
}
bResult = OnScrollBy(CSize(0, nDisplacement), TRUE);
}
else if (bHasHorzBar)
{
nToScroll = ::MulDiv(-zDelta, uWheelScrollLines, WHEEL_DELTA);
if (nToScroll == -1 || uWheelScrollLines == WHEEL_PAGESCROLL)
{
nDisplacement = m_pageDev.cx;
if (zDelta > 0)
nDisplacement = -nDisplacement;
}
else
{
nDisplacement = nToScroll * m_lineDev.cx;
nDisplacement = min(nDisplacement, m_pageDev.cx);
}
bResult = OnScrollBy(CSize(nDisplacement, 0), TRUE);
}
if (bResult)
UpdateWindow();
return bResult;
}
