1 files changed, 136 insertions, 0 deletions
diff --git a/wintable/util.h b/wintable/util.h
new file mode 100644
index 0000000..c12435f
--- /dev/null
+++ b/wintable/util.h
@@ -0,0 +1,136 @@
+// 29 november 2014
+
+static LONG rowHeight(struct table *t)
+{
+	HFONT thisfont, prevfont;
+	TEXTMETRICW tm;
+	HDC dc;
+	LONG ret;
+
+	dc = GetDC(t->hwnd);
+	if (dc == NULL)
+		abort();
+	thisfont = t->font;		// in case WM_SETFONT happens before we return
+	prevfont = (HFONT) SelectObject(dc, thisfont);
+	if (prevfont == NULL)
+		abort();
+	if (GetTextMetricsW(dc, &tm) == 0)
+		abort();
+	if (SelectObject(dc, prevfont) != (HGDIOBJ) (thisfont))
+		abort();
+	if (ReleaseDC(t->hwnd, dc) == 0)
+		abort();
+	ret = tm.tmHeight;
+	if (ret < t->imagelistHeight)
+		ret = t->imagelistHeight;
+	if (ret < t->checkboxHeight)
+		ret = t->checkboxHeight;
+	return ret;
+}
+
+static void redrawAll(struct table *t)
+{
+	if (InvalidateRect(t->hwnd, NULL, TRUE) == 0)
+		abort();
+	if (UpdateWindow(t->hwnd) == 0)
+		abort();
+}
+
+static RECT realClientRect(struct table *t)
+{
+	RECT r;
+
+	if (GetClientRect(t->hwnd, &r) == 0)
+		abort();
+	r.top += t->headerHeight;
+	return r;
+}
+
+static void repositionHeader(struct table *t)
+{
+	RECT r;
+	HDLAYOUT headerlayout;
+	WINDOWPOS headerpos;
+
+	if (GetClientRect(t->hwnd, &r) == 0)		// use the whole client rect
+		abort();
+	// grow the rectangle to the left to fake scrolling
+	r.left -= t->hpos;
+	headerlayout.prc = &r;
+	headerlayout.pwpos = &headerpos;
+	if (SendMessageW(t->header, HDM_LAYOUT, 0, (LPARAM) (&headerlayout)) == FALSE)
+		abort();
+	if (SetWindowPos(t->header, headerpos.hwndInsertAfter, headerpos.x, headerpos.y, headerpos.cx, headerpos.cy, headerpos.flags | SWP_SHOWWINDOW) == 0)
+		abort();
+	t->headerHeight = headerpos.cy;
+}
+
+// this counts partially visible rows
+// for all fully visible rows use t->pagesize
+// cliprect and rowHeight must be specified here to avoid recomputing things multiple times
+static intptr_t lastVisible(struct table *t, RECT cliprect, LONG rowHeight)
+{
+	intptr_t last;
+
+	last = ((cliprect.bottom + rowHeight - 1) / rowHeight) + t->firstVisible;
+	if (last >= t->count)
+		last = t->count;
+	return last;
+}
+
+static void redrawRow(struct table *t, intptr_t row)
+{
+	RECT r;
+	intptr_t height;
+
+	r = realClientRect(t);
+	height = rowHeight(t);
+	if (row < t->firstVisible || row > lastVisible(t, r, height))		// not visible; don't bother
+		return;
+	r.top = (row - t->firstVisible) * height + t->headerHeight;
+	r.bottom = r.top + height;
+	// keep the width and height the same; it spans the client area anyway
+	if (InvalidateRect(t->hwnd, &r, TRUE) == 0)
+		abort();
+	if (UpdateWindow(t->hwnd) == 0)
+		abort();
+}
+
+static intptr_t hitTestColumn(struct table *t, int x)
+{
+	HDITEMW item;
+	intptr_t i;
+
+	// 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();
+		if (x < item.cxy)
+			return i;
+		x -= item.cxy;		// not yet
+	}
+	// no column
+	return -1;
+}
+
+static void lParamToRowColumn(struct table *t, LPARAM lParam, intptr_t *row, intptr_t *column)
+{
+	int x, y;
+	LONG h;
+
+	x = GET_X_LPARAM(lParam);
+	y = GET_Y_LPARAM(lParam);
+	h = rowHeight(t);
+	y += t->firstVisible * h;
+	y -= t->headerHeight;
+	y /= h;
+	if (row != NULL) {
+		*row = y;
+		if (*row >= t->count)
+			*row = -1;
+	}
+	if (column != NULL)
+		*column = hitTestColumn(t, x);
+}