Started splitting the new Windows Table code into more manageable chunks.

1 files changed, 114 insertions, 0 deletions

diff --git a/wintable/hscroll.h b/wintable/hscroll.h
new file mode 100644
index 0000000..6c700a7
--- /dev/null
+++ b/wintable/hscroll.h
@@ -0,0 +1,114 @@
+// 29 november 2014
+
+static void hscrollto(struct table *t, intptr_t newpos)
+{
+	SCROLLINFO si;
+	RECT scrollArea;
+
+	if (newpos < 0)
+		newpos = 0;
+	if (newpos > (t->width - t->hpagesize))
+		newpos = (t->width - t->hpagesize);
+
+	scrollArea = realClientRect(t);
+
+	// negative because ScrollWindowEx() is "backwards"
+	if (ScrollWindowEx(t->hwnd, -(newpos - t->hpos), 0,
+		&scrollArea, &scrollArea, 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);
+
+	// and finally reposition the header
+	repositionHeader(t);
+}
+
+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)
+{
+	HDITEMW item;
+	intptr_t i;
+	int width = 0;
+	RECT r;
+	SCROLLINFO si;
+
+	// TODO count dividers
+	for (i = 0; i < t->nColumns; i++) {
+		ZeroMemory(&item, sizeof (HDITEMW));
+		item.mask = HDI_WIDTH;
+		if (SendMessageW(t->header, HDM_GETITEM, (WPARAM) i, (LPARAM) (&item)) == FALSE)
+			abort();
+		width += item.cxy;
+	}
+	t->width = (intptr_t) width;
+
+	if (GetClientRect(t->hwnd, &r) == 0)
+		abort();
+	t->hpagesize = r.right - r.left;
+
+	ZeroMemory(&si, sizeof (SCROLLINFO));
+	si.cbSize = sizeof (SCROLLINFO);
+	si.fMask = SIF_PAGE | SIF_RANGE;
+	si.nPage = t->hpagesize;
+	si.nMin = 0;
+	si.nMax = t->width - 1;			// - 1 because endpoints inclusive
+	SetScrollInfo(t->hwnd, SB_HORZ, &si, TRUE);
+}