1 files changed, 80 insertions, 0 deletions

diff --git a/prev/wintable/header.h b/prev/wintable/header.h
new file mode 100644
index 0000000..b87f7c6
--- /dev/null
+++ b/prev/wintable/header.h
@@ -0,0 +1,80 @@
+// 7 december 2014
+
+// TODO verify header events (double-clicking on a divider, for example)
+
+static void makeHeader(struct table *t, HINSTANCE hInstance)
+{
+	t->header = CreateWindowExW(0,
+		WC_HEADERW, L"",
+		// don't set WS_VISIBLE; according to MSDN we create the header hidden as part of setting the initial position (http://msdn.microsoft.com/en-us/library/windows/desktop/ff485935%28v=vs.85%29.aspx)
+		// TODO WS_BORDER?
+		// TODO is HDS_HOTTRACK needed?
+		WS_CHILD | HDS_FULLDRAG | HDS_HORZ | HDS_HOTTRACK,
+		0, 0, 0, 0,		// no initial size
+		t->hwnd, (HMENU) 100, hInstance, NULL);
+	if (t->header == NULL)
+		panic("error creating Table header");
+}
+
+static void destroyHeader(struct table *t)
+{
+	if (DestroyWindow(t->header) == 0)
+		panic("error destroying Table header");
+}
+
+// to avoid weird bugs, the only functions allowed to call this one are the horizontal scroll functions
+// when we need to reposition the header in a situation other than a user-initiated scroll, we use a dummy scroll (hscrollby(t, 0))
+// see update() in update.h
+static void repositionHeader(struct table *t)
+{
+	RECT r;
+	WINDOWPOS wp;
+	HDLAYOUT l;
+
+	if (GetClientRect(t->hwnd, &r) == 0)
+		panic("error getting client rect for Table header repositioning");
+	// we fake horizontal scrolling here by extending the client rect to the left by the scroll position
+	r.left -= t->hscrollpos;
+	l.prc = &r;
+	l.pwpos = ℘
+	if (SendMessageW(t->header, HDM_LAYOUT, 0, (LPARAM) (&l)) == FALSE)
+		panic("error getting new Table header position");
+	if (SetWindowPos(t->header, wp.hwndInsertAfter,
+		wp.x, wp.y, wp.cx, wp.cy,
+		// see above on showing the header here instead of in the CreateWindowExW() call
+		wp.flags | SWP_SHOWWINDOW) == 0)
+		panic("error repositioning Table header");
+	t->headerHeight = wp.cy;
+}
+
+static void headerAddColumn(struct table *t, WCHAR *name)
+{
+	HDITEMW item;
+
+	ZeroMemory(&item, sizeof (HDITEMW));
+	item.mask = HDI_WIDTH | HDI_TEXT | HDI_FORMAT;
+	item.cxy = 200;		// TODO
+	item.pszText = name;
+	item.fmt = HDF_LEFT | HDF_STRING;
+	// TODO replace 100 with (t->nColumns - 1)
+	if (SendMessage(t->header, HDM_INSERTITEM, (WPARAM) (100), (LPARAM) (&item)) == (LRESULT) (-1))
+		panic("error adding column to Table header");
+}
+
+// TODO is this triggered if we programmatically move headers (for autosizing)?
+HANDLER(headerNotifyHandler)
+{
+	NMHDR *nmhdr = (NMHDR *) lParam;
+
+	if (nmhdr->hwndFrom != t->header)
+		return FALSE;
+	if (nmhdr->code != HDN_ITEMCHANGED)
+		return FALSE;
+	update(t, TRUE);
+	// TODO make more intelligent
+	// to do this, we have to redraw the column to the left of the divider that was dragged and scroll everything to the right normally (leaving the hole that was scrolled invalidated as well)
+	// of course, this implies that dragging a divider only resizes the column of which it is the right side of and moves all others
+	InvalidateRect(t->hwnd, NULL, TRUE);
+	*lResult = 0;
+	return TRUE;
+}