More header control stuff: resize handling/header control repositioning.

wintable/new/header.h

@@ -4,6 +4,7 @@ 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,
@@ -21,5 +22,19 @@ static void destroyHeader(struct table *t)
 
 static void repositionHeader(struct table *t)
 {
-	// TODO http://msdn.microsoft.com/en-us/library/windows/desktop/hh298357%28v=vs.85%29.aspx
+	RECT r;
+	WINDOWPOS wp;
+	HDLAYOUT l;
+
+	if (GetClientRect(t->hwnd, &r) == 0)
+		panic("error getting client rect for Table header repositioning");
+	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");
 }

wintable/new/main.c

@@ -56,10 +56,12 @@ struct table {
 #include "events.h"
 #include "header.h"
 #include "children.h"
+#include "resize.h"
 
 static const handlerfunc handlers[] = {
 	eventHandlers,
 	childrenHandlers,
+	resizeHandler,
 	NULL,
 };
 

wintable/new/resize.h

@@ -0,0 +1,17 @@
+// 7 december 2014
+
+// TODO why doesn't this trigger on first show?
+
+HANDLER(resizeHandler)
+{
+	WINDOWPOS *wp;
+
+	if (uMsg != WM_WINDOWPOSCHANGED)
+		return FALSE;
+	wp = (WINDOWPOS *) lParam;
+	if ((wp->flags & SWP_NOSIZE) != 0)
+		return FALSE;
+	repositionHeader(t);
+	*lResult = 0;
+	return TRUE;
+}