//+---------------------------------------------------------------------------
//
// Member: CScrollbar::GetPart
//
// Synopsis: Return the scroll bar part hit by the given test point.
//
// Arguments: direction 0 for horizontal scroll bar, 1 for vertical
// rcScrollbar scroll bar bounds
// ptHit test point
// contentSize size of content controlled by scroll bar
// containerSize size of container
// scrollAmount current scroll amount
// buttonWidth width of scroll bar buttons
// fRightToLeft The text flow is RTL...0,0 is at top right
//
// Returns: The scroll bar part hit, or SBP_NONE if nothing was hit.
//
// Notes:
//
//----------------------------------------------------------------------------
CScrollbar::SCROLLBARPART CScrollbar::GetPart(
int direction,
const CRect& rcScrollbar,
const CPoint& ptHit,
long contentSize,
long containerSize,
long scrollAmount,
long buttonWidth,
CDrawInfo* pDI,
BOOL fRightToLeft)
{
if(!rcScrollbar.Contains(ptHit))
{
return SBP_NONE;
}
// adjust button width if there isn't room for both buttons at full size
long scaledButtonWidth = GetScaledButtonWidth(direction, rcScrollbar, buttonWidth);
// now test just the axis that matters
long x = ptHit[direction];
if(x < rcScrollbar.TopLeft()[direction]+scaledButtonWidth)
{
return SBP_PREVBUTTON;
}
if(x >= rcScrollbar.BottomRight()[direction]-scaledButtonWidth)
{
return SBP_NEXTBUTTON;
}
// NOTE: if there is no thumb, return SBP_TRACK
CRect rcThumb;
GetPartRect(
&rcThumb,
SBP_THUMB,
direction,
rcScrollbar,
contentSize,
containerSize,
scrollAmount,
buttonWidth,
pDI,
fRightToLeft);
if(rcThumb.IsEmpty())
{
return SBP_TRACK;
}
if(x < rcThumb.TopLeft()[direction])
{
return SBP_PREVTRACK;
}
if(x >= rcThumb.BottomRight()[direction])
{
return SBP_NEXTTRACK;
}
return SBP_THUMB;
}
