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// 9 december 2014
struct scrollParams {
intptr_t *pos;
intptr_t pagesize;
intptr_t length;
intptr_t scale;
void (*post)(struct table *);
int *wheelCarry;
};
static void scrollto(struct table *t, int which, struct scrollParams *p, intptr_t pos)
{
RECT scrollArea;
SCROLLINFO si;
intptr_t xamount, yamount;
if (pos < 0)
pos = 0;
if (pos > p->length - p->pagesize)
pos = p->length - p->pagesize;
// TODO this shouldn't have been necessary but alas
// TODO the logic is really intended for the whole y origin thing in the scrollbar series; fix that
if (pos < 0)
pos = 0;
// we don't want to scroll the header
if (GetClientRect(t->hwnd, &scrollArea) == 0)
panic("error getting Table client rect for scrollto()");
scrollArea.top += t->headerHeight;
// negative because ScrollWindowEx() is "backwards"
xamount = -(pos - *(p->pos)) * p->scale;
yamount = 0;
if (which == SB_VERT) {
yamount = xamount;
xamount = 0;
}
if (ScrollWindowEx(t->hwnd, xamount, yamount,
&scrollArea, &scrollArea, NULL, NULL,
SW_ERASE | SW_INVALIDATE) == ERROR)
;// TODO failure case ignored for now; see https://bugs.winehq.org/show_bug.cgi?id=37706
// panic("error scrolling Table");
// TODO call UpdateWindow()?
*(p->pos) = pos;
// now commit our new scrollbar setup...
ZeroMemory(&si, sizeof (SCROLLINFO));
si.cbSize = sizeof (SCROLLINFO);
si.fMask = SIF_PAGE | SIF_POS | SIF_RANGE;
si.nPage = p->pagesize;
si.nMin = 0;
si.nMax = p->length - 1; // endpoint inclusive
si.nPos = *(p->pos);
SetScrollInfo(t->hwnd, which, &si, TRUE);
if (p->post != NULL)
(*(p->post))(t);
// EVENT_OBJECT_CONTENTSCROLLED is Vista and up only
// TODO send state changes for all affected rows/cells?
}
static void scrollby(struct table *t, int which, struct scrollParams *p, intptr_t delta)
{
scrollto(t, which, p, *(p->pos) + delta);
}
static void scroll(struct table *t, int which, struct scrollParams *p, WPARAM wParam, LPARAM lParam)
{
intptr_t pos;
SCROLLINFO si;
pos = *(p->pos);
switch (LOWORD(wParam)) {
case SB_LEFT: // also SB_TOP
pos = 0;
break;
case SB_RIGHT: // also SB_BOTTOM
pos = p->length - p->pagesize;
break;
case SB_LINELEFT: // also SB_LINEUP
pos--;
break;
case SB_LINERIGHT: // also SB_LINEDOWN
pos++;
break;
case SB_PAGELEFT: // also SB_PAGEUP
pos -= p->pagesize;
break;
case SB_PAGERIGHT: // also SB_PAGEDOWN
pos += p->pagesize;
break;
case SB_THUMBPOSITION:
ZeroMemory(&si, sizeof (SCROLLINFO));
si.cbSize = sizeof (SCROLLINFO);
si.fMask = SIF_POS;
if (GetScrollInfo(t->hwnd, which, &si) == 0)
panic("error getting thumb position for scroll() in Table");
pos = si.nPos;
break;
case SB_THUMBTRACK:
ZeroMemory(&si, sizeof (SCROLLINFO));
si.cbSize = sizeof (SCROLLINFO);
si.fMask = SIF_TRACKPOS;
if (GetScrollInfo(t->hwnd, which, &si) == 0)
panic("error getting thumb track position for scroll() in Table");
pos = si.nTrackPos;
break;
}
scrollto(t, which, p, pos);
}
static void wheelscroll(struct table *t, int which, struct scrollParams *p, WPARAM wParam, LPARAM lParam)
{
int delta;
int lines;
UINT scrollAmount;
delta = GET_WHEEL_DELTA_WPARAM(wParam);
// TODO make a note of what the appropriate hscroll constant is
if (SystemParametersInfoW(SPI_GETWHEELSCROLLLINES, 0, &scrollAmount, 0) == 0)
// TODO use scrollAmount == 3 instead?
panic("error getting wheel scroll amount in wheelscroll()");
if (scrollAmount == WHEEL_PAGESCROLL)
scrollAmount = p->pagesize;
if (scrollAmount == 0) // no mouse wheel scrolling (or t->pagesize == 0)
return;
// the rest of this is basically http://blogs.msdn.com/b/oldnewthing/archive/2003/08/07/54615.aspx and http://blogs.msdn.com/b/oldnewthing/archive/2003/08/11/54624.aspx
// see those pages for information on subtleties
delta += *(p->wheelCarry);
lines = delta * ((int) scrollAmount) / WHEEL_DELTA;
*(p->wheelCarry) = delta - lines * WHEEL_DELTA / ((int) scrollAmount);
scrollby(t, which, p, -lines);
}
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