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Added wheel scrolling.

This commit is contained in:
Pietro Gagliardi 2014-12-12 22:17:20 -05:00
parent d5b4d06cb4
commit 5080e84398
4 changed files with 46 additions and 5 deletions
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1
wintable/new/hscroll.h
View File

@ -13,6 +13,7 @@ static struct scrollParams hscrollParams(struct table *t)
p.length = t->width;
p.scale = 1;
p.post = repositionHeader;
p.wheelCarry = &(t->hwheelCarry);
return p;
}

2
wintable/new/main.c
View File

@ -62,6 +62,8 @@ struct table {
intptr_t count;
intptr_t vscrollpos; // in rows
intptr_t vpagesize; // in rows
int hwheelCarry;
int vwheelCarry;
};
#include "util.h"

24
wintable/new/scroll.h
View File

@ -6,6 +6,7 @@ struct scrollParams {
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)
@ -104,3 +105,26 @@ static void scroll(struct table *t, int which, struct scrollParams *p, WPARAM wP
}
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);
}

24
wintable/new/vscroll.h
View File

@ -13,6 +13,7 @@ static struct scrollParams vscrollParams(struct table *t)
p.length = t->count;
p.scale = rowht(t);
p.post = NULL;
p.wheelCarry = &(t->vwheelCarry);
return p;
}
@ -40,12 +41,25 @@ static void vscroll(struct table *t, WPARAM wParam, LPARAM lParam)
scroll(t, SB_VERT, &p, wParam, lParam);
}
static void vwheelscroll(struct table *t, WPARAM wParam, LPARAM lParam)
{
struct scrollParams p;
p = vscrollParams(t);
wheelscroll(t, SB_VERT, &p, wParam, lParam);
}
// TODO WM_MOUSEWHEEL
HANDLER(vscrollHandler)
{
if (uMsg != WM_VSCROLL)
return FALSE;
vscroll(t, wParam, lParam);
*lResult = 0;
return TRUE;
switch (uMsg) {
case WM_VSCROLL:
vscroll(t, wParam, lParam);
*lResult = 0;
return TRUE;
case WM_MOUSEWHEEL:
vwheelscroll(t, wParam, lParam);
// TODO what to return?
}
return FALSE;
}