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Implemented horizontal scrolling. Horizontally scrolled drawing not yet implemented.

This commit is contained in:
Pietro Gagliardi 2014-11-07 10:12:06 -05:00
parent bc5955bc35
commit 3cb5017b35
1 changed files with 82 additions and 3 deletions
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85
wintable/main.c
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@ -46,7 +46,7 @@ struct table {
HIMAGELIST imagelist; HIMAGELIST imagelist;
int imagelistHeight; int imagelistHeight;
intptr_t width; intptr_t width;
intptr_t hpageSize; intptr_t hpagesize;
intptr_t hpos; intptr_t hpos;
}; };
@ -94,6 +94,82 @@ static RECT realClientRect(struct table *t)
return r; return r;
} }
static void hscrollto(struct table *t, intptr_t newpos)
{
SCROLLINFO si;
if (newpos < 0)
newpos = 0;
if (newpos > (t->width - t->hpagesize))
newpos = (t->width - t->hpagesize);
// negative because ScrollWindowEx() is "backwards"
if (ScrollWindowEx(t->hwnd, -(newpos - t->hpos), 0,
NULL, NULL, NULL, NULL,
SW_ERASE | SW_INVALIDATE) == ERROR)
abort();
t->hpos = newpos;
// TODO text in header controls doesn't redraw?
// TODO put this in a separate function? same for vscroll?
ZeroMemory(&si, sizeof (SCROLLINFO));
si.cbSize = sizeof (SCROLLINFO);
si.fMask = SIF_PAGE | SIF_POS | SIF_RANGE;
si.nPage = t->hpagesize;
si.nMin = 0;
si.nMax = t->width - 1; // nMax is inclusive
si.nPos = t->hpos;
SetScrollInfo(t->hwnd, SB_HORZ, &si, TRUE);
}
static void hscrollby(struct table *t, intptr_t n)
{
hscrollto(t, t->hpos + n);
}
// unfortunately horizontal wheel scrolling was only added in Vista
static void hscroll(struct table *t, WPARAM wParam)
{
SCROLLINFO si;
intptr_t newpos;
ZeroMemory(&si, sizeof (SCROLLINFO));
si.cbSize = sizeof (SCROLLINFO);
si.fMask = SIF_POS | SIF_TRACKPOS;
if (GetScrollInfo(t->hwnd, SB_HORZ, &si) == 0)
abort();
newpos = t->hpos;
switch (LOWORD(wParam)) {
case SB_LEFT:
newpos = 0;
break;
case SB_RIGHT:
newpos = t->width - t->hpagesize;
break;
case SB_LINELEFT:
newpos--;
break;
case SB_LINERIGHT:
newpos++;
break;
case SB_PAGELEFT:
newpos -= t->hpagesize;
break;
case SB_PAGERIGHT:
newpos += t->hpagesize;
break;
case SB_THUMBPOSITION:
newpos = (intptr_t) (si.nPos);
break;
case SB_THUMBTRACK:
newpos = (intptr_t) (si.nTrackPos);
}
hscrollto(t, newpos);
}
static void recomputeHScroll(struct table *t) static void recomputeHScroll(struct table *t)
{ {
HDITEMW item; HDITEMW item;
@ -114,12 +190,12 @@ static void recomputeHScroll(struct table *t)
if (GetClientRect(t->hwnd, &r) == 0) if (GetClientRect(t->hwnd, &r) == 0)
abort(); abort();
t->hpageSize = r.right - r.left; t->hpagesize = r.right - r.left;
ZeroMemory(&si, sizeof (SCROLLINFO)); ZeroMemory(&si, sizeof (SCROLLINFO));
si.cbSize = sizeof (SCROLLINFO); si.cbSize = sizeof (SCROLLINFO);
si.fMask = SIF_PAGE | SIF_RANGE; si.fMask = SIF_PAGE | SIF_RANGE;
si.nPage = t->hpageSize; si.nPage = t->hpagesize;
si.nMin = 0; si.nMin = 0;
si.nMax = t->width - 1; // - 1 because endpoints inclusive si.nMax = t->width - 1; // - 1 because endpoints inclusive
SetScrollInfo(t->hwnd, SB_HORZ, &si, TRUE); SetScrollInfo(t->hwnd, SB_HORZ, &si, TRUE);
@ -533,6 +609,9 @@ if (ImageList_GetIconSize(t->imagelist, &unused, &(t->imagelistHeight)) == 0)abo
case WM_MOUSEWHEEL: case WM_MOUSEWHEEL:
wheelscroll(t, wParam); wheelscroll(t, wParam);
return 0; return 0;
case WM_HSCROLL:
hscroll(t, wParam);
return 0;
case WM_SIZE: case WM_SIZE:
resize(t); resize(t);
return 0; return 0;