static DWORD FASTCALL
IntScrollHitTest(PSCROLLBARINFO ScrollBarInfo, BOOL Vertical, POINT Pt, BOOL Dragging)
{
INT ArrowSize, ThumbSize, ThumbPos;
if ((Dragging && ! IntScrollPtInRectEx(&ScrollBarInfo->rcScrollBar, Pt, Vertical)) ||
! PtInRect(&ScrollBarInfo->rcScrollBar, Pt)) return SCROLL_NOWHERE;
ThumbPos = ScrollBarInfo->xyThumbTop;
ThumbSize = ScrollBarInfo->xyThumbBottom - ThumbPos;
ArrowSize = ScrollBarInfo->dxyLineButton;
if (Vertical)
{
if (Pt.y < ScrollBarInfo->rcScrollBar.top + ArrowSize) return SCROLL_TOP_ARROW;
if (Pt.y >= ScrollBarInfo->rcScrollBar.bottom - ArrowSize) return SCROLL_BOTTOM_ARROW;
if (!ThumbPos) return SCROLL_TOP_RECT;
Pt.y -= ScrollBarInfo->rcScrollBar.top;
if (Pt.y < ThumbPos) return SCROLL_TOP_RECT;
if (Pt.y >= ThumbPos + ThumbSize) return SCROLL_BOTTOM_RECT;
}
else
{
if (Pt.x < ScrollBarInfo->rcScrollBar.left + ArrowSize) return SCROLL_TOP_ARROW;
if (Pt.x >= ScrollBarInfo->rcScrollBar.right - ArrowSize) return SCROLL_BOTTOM_ARROW;
if (!ThumbPos) return SCROLL_TOP_RECT;
Pt.x -= ScrollBarInfo->rcScrollBar.left;
if (Pt.x < ThumbPos) return SCROLL_TOP_RECT;
if (Pt.x >= ThumbPos + ThumbSize) return SCROLL_BOTTOM_RECT;
}
return SCROLL_THUMB;
}
/***********************************************************************
* IntScrollHandleScrollEvent
*
* Handle a mouse or timer event for the scrollbar.
* 'Pt' is the location of the mouse event in drawing coordinates
*/
static VOID FASTCALL
IntScrollHandleScrollEvent(HWND Wnd, INT SBType, UINT Msg, POINT Pt)
{
static POINT PrevPt; /* Previous mouse position for timer events */
static UINT TrackThumbPos; /* Thumb position when tracking started. */
static INT LastClickPos; /* Position in the scroll-bar of the last
button-down event. */
static INT LastMousePos; /* Position in the scroll-bar of the last
mouse event. */
DWORD HitTest;
HWND WndOwner, WndCtl;
BOOL Vertical;
HDC Dc;
SCROLLBARINFO ScrollBarInfo;
SETSCROLLBARINFO NewInfo;
if (! IntGetScrollBarInfo(Wnd, SBType, &ScrollBarInfo))
{
return;
}
if (SCROLL_NOWHERE == ScrollTrackHitTest && WM_LBUTTONDOWN != Msg)
{
return;
}
NewInfo.nTrackPos = ScrollTrackingVal;
NewInfo.reserved = ScrollBarInfo.reserved;
memcpy(NewInfo.rgstate, ScrollBarInfo.rgstate, (CCHILDREN_SCROLLBAR + 1) * sizeof(DWORD));
if (SB_CTL == SBType
&& 0 != (GetWindowLongPtrW(Wnd, GWL_STYLE) & (SBS_SIZEGRIP | SBS_SIZEBOX)))
{
switch(Msg)
{
case WM_LBUTTONDOWN: /* Initialise mouse tracking */
HideCaret(Wnd); /* hide caret while holding down LBUTTON */
SetCapture(Wnd);
PrevPt = Pt;
ScrollTrackHitTest = HitTest = SCROLL_THUMB;
break;
case WM_MOUSEMOVE:
GetClientRect(GetParent(GetParent(Wnd)), &ScrollBarInfo.rcScrollBar);
PrevPt = Pt;
break;
case WM_LBUTTONUP:
ReleaseCapture();
ScrollTrackHitTest = HitTest = SCROLL_NOWHERE;
if (Wnd == GetFocus())
{
ShowCaret(Wnd);
}
break;
case WM_SYSTIMER:
Pt = PrevPt;
break;
}
return;
}
Dc = GetDCEx(Wnd, 0, DCX_CACHE | ((SB_CTL == SBType) ? 0 : DCX_WINDOW));
if (SB_VERT == SBType)
{
Vertical = TRUE;
}
else if (SB_HORZ == SBType)
{
Vertical = FALSE;
}
else
{
Vertical = (0 != (GetWindowLongPtrW(Wnd, GWL_STYLE) & SBS_VERT));
}
WndOwner = (SB_CTL == SBType) ? GetParent(Wnd) : Wnd;
WndCtl = (SB_CTL == SBType) ? Wnd : NULL;
switch (Msg)
{
case WM_LBUTTONDOWN: /* Initialise mouse tracking */
HideCaret(Wnd); /* hide caret while holding down LBUTTON */
ScrollTrackVertical = Vertical;
ScrollTrackHitTest = HitTest = IntScrollHitTest(&ScrollBarInfo, Vertical, Pt, FALSE );
LastClickPos = Vertical ? (Pt.y - ScrollBarInfo.rcScrollBar.top)
: (Pt.x - ScrollBarInfo.rcScrollBar.left);
LastMousePos = LastClickPos;
TrackThumbPos = ScrollBarInfo.xyThumbTop;
PrevPt = Pt;
if (SB_CTL == SBType && 0 != (GetWindowLongPtrW(Wnd, GWL_STYLE) & WS_TABSTOP))
{
SetFocus(Wnd);
}
SetCapture(Wnd);
ScrollBarInfo.rgstate[ScrollTrackHitTest] |= STATE_SYSTEM_PRESSED;
NewInfo.rgstate[ScrollTrackHitTest] = ScrollBarInfo.rgstate[ScrollTrackHitTest];
NtUserSetScrollBarInfo(Wnd, IntScrollGetObjectId(SBType), &NewInfo);
break;
case WM_MOUSEMOVE:
HitTest = IntScrollHitTest(&ScrollBarInfo, Vertical, Pt, TRUE);
PrevPt = Pt;
break;
case WM_LBUTTONUP:
HitTest = SCROLL_NOWHERE;
ReleaseCapture();
/* if scrollbar has focus, show back caret */
if (Wnd == GetFocus())
{
ShowCaret(Wnd);
}
ScrollBarInfo.rgstate[ScrollTrackHitTest] &= ~STATE_SYSTEM_PRESSED;
NewInfo.rgstate[ScrollTrackHitTest] = ScrollBarInfo.rgstate[ScrollTrackHitTest];
NtUserSetScrollBarInfo(Wnd, IntScrollGetObjectId(SBType), &NewInfo);
break;
case WM_SYSTIMER:
Pt = PrevPt;
HitTest = IntScrollHitTest(&ScrollBarInfo, Vertical, Pt, FALSE);
break;
default:
return; /* Should never happen */
}
switch (ScrollTrackHitTest)
{
case SCROLL_NOWHERE: /* No tracking in progress */
break;
case SCROLL_TOP_ARROW:
if (HitTest == ScrollTrackHitTest)
{
if ((WM_LBUTTONDOWN == Msg) || (WM_SYSTIMER == Msg))
{
SendMessageW(WndOwner, Vertical ? WM_VSCROLL : WM_HSCROLL,
SB_LINEUP, (LPARAM) WndCtl);
}
SetSystemTimer(Wnd, SCROLL_TIMER, (WM_LBUTTONDOWN == Msg) ?
SCROLL_FIRST_DELAY : SCROLL_REPEAT_DELAY,
(TIMERPROC) NULL);
}
else
{
KillSystemTimer(Wnd, SCROLL_TIMER);
}
break;
case SCROLL_TOP_RECT:
if (HitTest == ScrollTrackHitTest)
{
if ((WM_LBUTTONDOWN == Msg) || (WM_SYSTIMER == Msg))
{
SendMessageW(WndOwner, Vertical ? WM_VSCROLL : WM_HSCROLL,
SB_PAGEUP, (LPARAM) WndCtl);
}
SetSystemTimer(Wnd, SCROLL_TIMER, (WM_LBUTTONDOWN == Msg) ?
SCROLL_FIRST_DELAY : SCROLL_REPEAT_DELAY,
(TIMERPROC) NULL);
}
else
{
KillSystemTimer(Wnd, SCROLL_TIMER);
}
break;
case SCROLL_THUMB:
if (WM_LBUTTONDOWN == Msg)
{
ScrollTrackingWin = Wnd;
ScrollTrackingBar = SBType;
ScrollTrackingPos = TrackThumbPos + LastMousePos - LastClickPos;
ScrollTrackingVal = IntScrollGetThumbVal(Wnd, SBType, &ScrollBarInfo,
Vertical, ScrollTrackingPos);
NewInfo.nTrackPos = ScrollTrackingVal;
NtUserSetScrollBarInfo(Wnd, IntScrollGetObjectId(SBType), &NewInfo);
IntScrollDrawMovingThumb(Dc, &ScrollBarInfo, Vertical);
}
else if (WM_LBUTTONUP == Msg)
{
ScrollTrackingWin = 0;
ScrollTrackingVal = 0;
IntDrawScrollInterior(Wnd, Dc, SBType, Vertical, &ScrollBarInfo);
}
else /* WM_MOUSEMOVE */
{
UINT Pos;
if (! IntScrollPtInRectEx(&ScrollBarInfo.rcScrollBar, Pt, Vertical))
{
Pos = LastClickPos;
}
else
{
Pt = IntScrollClipPos(&ScrollBarInfo.rcScrollBar, Pt);
Pos = Vertical ? (Pt.y - ScrollBarInfo.rcScrollBar.top)
: (Pt.x - ScrollBarInfo.rcScrollBar.left);
}
if (Pos != LastMousePos || ! ScrollMovingThumb)
{
LastMousePos = Pos;
ScrollTrackingPos = TrackThumbPos + Pos - LastClickPos;
ScrollTrackingVal = IntScrollGetThumbVal(Wnd, SBType, &ScrollBarInfo,
Vertical, ScrollTrackingPos);
NewInfo.nTrackPos = ScrollTrackingVal;
NtUserSetScrollBarInfo(Wnd, IntScrollGetObjectId(SBType), &NewInfo);
IntScrollDrawMovingThumb(Dc, &ScrollBarInfo, Vertical);
SendMessageW(WndOwner, Vertical ? WM_VSCROLL : WM_HSCROLL,
MAKEWPARAM(SB_THUMBTRACK, ScrollTrackingVal),
(LPARAM) WndCtl);
}
}
break;
case SCROLL_BOTTOM_RECT:
if (HitTest == ScrollTrackHitTest)
{
if ((WM_LBUTTONDOWN == Msg) || (WM_SYSTIMER == Msg))
{
SendMessageW(WndOwner, Vertical ? WM_VSCROLL : WM_HSCROLL,
SB_PAGEDOWN, (LPARAM) WndCtl);
}
SetSystemTimer(Wnd, SCROLL_TIMER, (WM_LBUTTONDOWN == Msg) ?
SCROLL_FIRST_DELAY : SCROLL_REPEAT_DELAY,
(TIMERPROC) NULL);
}
else
{
KillSystemTimer(Wnd, SCROLL_TIMER);
}
break;
case SCROLL_BOTTOM_ARROW:
if (HitTest == ScrollTrackHitTest)
{
if ((WM_LBUTTONDOWN == Msg) || (WM_SYSTIMER == Msg))
{
SendMessageW(WndOwner, Vertical ? WM_VSCROLL : WM_HSCROLL,
SB_LINEDOWN, (LPARAM) WndCtl);
}
SetSystemTimer(Wnd, SCROLL_TIMER, (WM_LBUTTONDOWN == Msg) ?
SCROLL_FIRST_DELAY : SCROLL_REPEAT_DELAY,
(TIMERPROC) NULL);
}
else
{
KillSystemTimer(Wnd, SCROLL_TIMER);
}
break;
}
if (WM_LBUTTONDOWN == Msg)
{
if (SCROLL_THUMB == HitTest)
{
UINT Val = IntScrollGetThumbVal(Wnd, SBType, &ScrollBarInfo, Vertical,
TrackThumbPos + LastMousePos - LastClickPos);
SendMessageW(WndOwner, Vertical ? WM_VSCROLL : WM_HSCROLL,
MAKEWPARAM(SB_THUMBTRACK, Val), (LPARAM) WndCtl);
}
}
if (WM_LBUTTONUP == Msg)
{
HitTest = ScrollTrackHitTest;
ScrollTrackHitTest = SCROLL_NOWHERE; /* Terminate tracking */
if (SCROLL_THUMB == HitTest)
{
UINT Val = IntScrollGetThumbVal(Wnd, SBType, &ScrollBarInfo, Vertical,
TrackThumbPos + LastMousePos - LastClickPos);
SendMessageW(WndOwner, Vertical ? WM_VSCROLL : WM_HSCROLL,
MAKEWPARAM(SB_THUMBPOSITION, Val), (LPARAM) WndCtl);
}
SendMessageW(WndOwner, Vertical ? WM_VSCROLL : WM_HSCROLL,
SB_ENDSCROLL, (LPARAM) WndCtl);
}
ReleaseDC(Wnd, Dc);
}
