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More Windows uiArea scrolling work.

This commit is contained in:
Pietro Gagliardi 2015-09-08 21:53:20 -04:00
parent 8c14cfefd1
commit b2faa68bf0
1 changed files with 64 additions and 9 deletions
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73
winarea/area.c
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@ -43,6 +43,7 @@ struct scrollParams {
intmax_t pagesize;
intmax_t length;
int *wheelCarry;
UINT wheelSPIAction;
};
void scrollto(uiArea *a, int which, struct scrollParams *p, intmax_t pos)
@ -137,27 +138,70 @@ void scroll(uiArea *a, int which, struct scrollParams *p, WPARAM wParam, LPARAM
static void wheelscroll(uiArea *a, int which, struct scrollParams *p, WPARAM wParam, LPARAM lParam)
{
/*TODO
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?
return logLastError("error getting wheel scroll amount in wheelscroll()");
if (SystemParametersInfoW(p->wheelSPIAction, 0, &scrollAmount, 0) == 0)
// TODO use scrollAmount == 3 (for both v and h) instead?
logLastError("error getting area wheel scroll amount in wheelscroll()");
if (scrollAmount == WHEEL_PAGESCROLL)
scrollAmount = p->pagesize;
if (scrollAmount == 0) // no mouse wheel scrolling (or t->pagesize == 0)
return S_OK;
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);
return scrollby(t, which, p, -lines);
*/
return scrollby(a, which, p, -lines);
}
static void hscrollParams(uiArea *a, struct scrollParams *p)
{
RECT r;
ZeroMemory(p, sizeof (struct scrollParams));
p->pos = &(a->hscrollpos);
if (GetClientRect(a->hwnd, &r) == 0)
logLastError("error getting area client rect in hscrollParams()");
p->pagesize = r.right - r.left;
p->length = (*(a->ah->HScrollMax))(a->ah, a);
p->wheelCarry = &(a->hwheelCarry);
p->wheelSPIAction = SPI_GETWHEELSCROLLCHARS;
}
static void hscrollto(uiArea *a, intmax_t pos)
{
struct scrollParams p;
hscrollParams(a, &p);
scrollto(a, SB_HORZ, &p, pos);
}
static void hscrollby(uiArea *a, intmax_t delta)
{
struct scrollParams p;
hscrollParams(a, &p);
scrollby(a, SB_HORZ, &p, delta);
}
static void hscroll(uiArea *a, WPARAM wParam, LPARAM lParam)
{
struct scrollParams p;
hscrollParams(a, &p);
scroll(a, SB_HORZ, &p, wParam, lParam);
}
static void hwheelscroll(uiArea *a, WPARAM wParam, LPARAM lParam)
{
struct scrollParams p;
hscrollParams(a, &p);
wheelscroll(a, SB_HORZ, &p, wParam, lParam);
}
static void vscrollParams(uiArea *a, struct scrollParams *p)
@ -171,6 +215,7 @@ static void vscrollParams(uiArea *a, struct scrollParams *p)
p->pagesize = r.bottom - r.top;
p->length = (*(a->ah->VScrollMax))(a->ah, a);
p->wheelCarry = &(a->vwheelCarry);
p->wheelSPIAction = SPI_GETWHEELSCROLLLINES;
}
static void vscrollto(uiArea *a, intmax_t pos)
@ -236,12 +281,22 @@ static LRESULT CALLBACK areaWndProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM
logLastError("error getting client rect in WM_PRINTCLIENT in areaWndProc()");
doPaint(a, (HDC) wParam, &client, &client);
return 0;
case WM_HSCROLL:
hscroll(a, wParam, lParam);
return 0;
case WM_MOUSEHWHEEL:
hwheelscroll(a, wParam, lParam);
return 0;
case WM_VSCROLL:
vscroll(a, wParam, lParam);
return 0;
case WM_MOUSEWHEEL:
vwheelscroll(a, wParam, lParam);
return 0;
case WM_LBUTTONDOWN:
// TODO
SetFocus(a->hwnd);
break;
}
return DefWindowProc(hwnd, uMsg, wParam, lParam);
}
@ -291,6 +346,6 @@ void areaUpdateScroll(HWND area)
a = (uiArea *) GetWindowLongPtrW(area, GWLP_USERDATA);
// use a no-op scroll to simulate scrolling
// hscrollby(a, 0);
hscrollby(a, 0);
vscrollby(a, 0);
}