108 lines
2.6 KiB
C
108 lines
2.6 KiB
C
// 9 december 2014
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// forward declaration needed here
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static void repositionHeader(struct table *);
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static void hscrollto(struct table *t, intptr_t pos)
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{
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RECT scrollArea;
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SCROLLINFO si;
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if (pos < 0)
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pos = 0;
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if (pos > t->width - t->hpagesize)
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pos = t->width - t->hpagesize;
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// we don't want to scroll the header
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if (GetClientRect(t->hwnd, &scrollArea) == 0)
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panic("error getting Table client rect for hscrollto()");
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scrollArea.top += t->headerHeight;
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// negative because ScrollWindowEx() is "backwards"
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if (ScrollWindowEx(t->hwnd, -(pos - t->hscrollpos), 0,
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&scrollArea, &scrollArea, NULL, NULL,
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SW_ERASE | SW_INVALIDATE) == ERROR)
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;// TODO failure case ignored for now; see https://bugs.winehq.org/show_bug.cgi?id=37706
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// panic("error horizontally scrolling Table");
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// TODO call UpdateWindow()?
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t->hscrollpos = pos;
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// now commit our new scrollbar setup...
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ZeroMemory(&si, sizeof (SCROLLINFO));
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si.cbSize = sizeof (SCROLLINFO);
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si.fMask = SIF_PAGE | SIF_POS | SIF_RANGE;
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// the width of scrollArea is unchanged here; use it
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t->hpagesize = scrollArea.right - scrollArea.left;
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si.nPage = t->hpagesize;
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si.nMin = 0;
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si.nMax = t->width - 1; // endpoint inclusive
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si.nPos = t->hscrollpos;
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SetScrollInfo(t->hwnd, SB_HORZ, &si, TRUE);
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// and finally move the header
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repositionHeader(t);
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}
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static void hscrollby(struct table *t, intptr_t delta)
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{
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hscrollto(t, t->hscrollpos + delta);
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}
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static void hscroll(struct table *t, WPARAM wParam, LPARAM lParam)
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{
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intptr_t pos;
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SCROLLINFO si;
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pos = t->hscrollpos;
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switch (LOWORD(wParam)) {
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case SB_LEFT:
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pos = 0;
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break;
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case SB_RIGHT:
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pos = t->width - t->hpagesize;
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break;
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case SB_LINELEFT:
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pos--;
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break;
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case SB_LINERIGHT:
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pos++;
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break;
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case SB_PAGELEFT:
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pos -= t->hpagesize;
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break;
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case SB_PAGERIGHT:
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pos += t->hpagesize;
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break;
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case SB_THUMBPOSITION:
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ZeroMemory(&si, sizeof (SCROLLINFO));
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si.cbSize = sizeof (SCROLLINFO);
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si.fMask = SIF_POS;
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if (GetScrollInfo(t->hwnd, SB_HORZ, &si) == 0)
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panic("error getting thumb position for WM_HSCROLL in Table");
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pos = si.nPos;
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break;
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case SB_THUMBTRACK:
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ZeroMemory(&si, sizeof (SCROLLINFO));
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si.cbSize = sizeof (SCROLLINFO);
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si.fMask = SIF_TRACKPOS;
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if (GetScrollInfo(t->hwnd, SB_HORZ, &si) == 0)
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panic("error getting thumb track position for WM_HSCROLL in Table");
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pos = si.nTrackPos;
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break;
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}
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hscrollto(t, pos);
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}
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// TODO find out if we can indicriminately check for WM_WHEELHSCROLL
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HANDLER(hscrollHandler)
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{
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if (uMsg != WM_HSCROLL)
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return FALSE;
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hscroll(t, wParam, lParam);
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*lResult = 0;
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return TRUE;
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}
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// TODO when we write vscroll.h, see just /what/ is common so we can isolate it
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