another UI attempt, I guess.

sorry.

src/libui_sdl/libui/windows/combobox.cpp

@@ -0,0 +1,110 @@
+// 20 may 2015
+#include "uipriv_windows.hpp"
+
+// we as Common Controls 6 users don't need to worry about the height of comboboxes; see http://blogs.msdn.com/b/oldnewthing/archive/2006/03/10/548537.aspx
+
+struct uiCombobox {
+	uiWindowsControl c;
+	HWND hwnd;
+	void (*onSelected)(uiCombobox *, void *);
+	void *onSelectedData;
+};
+
+static BOOL onWM_COMMAND(uiControl *cc, HWND hwnd, WORD code, LRESULT *lResult)
+{
+	uiCombobox *c = uiCombobox(cc);
+
+	if (code != CBN_SELCHANGE)
+		return FALSE;
+	(*(c->onSelected))(c, c->onSelectedData);
+	*lResult = 0;
+	return TRUE;
+}
+
+void uiComboboxDestroy(uiControl *cc)
+{
+	uiCombobox *c = uiCombobox(cc);
+
+	uiWindowsUnregisterWM_COMMANDHandler(c->hwnd);
+	uiWindowsEnsureDestroyWindow(c->hwnd);
+	uiFreeControl(uiControl(c));
+}
+
+uiWindowsControlAllDefaultsExceptDestroy(uiCombobox)
+
+// from http://msdn.microsoft.com/en-us/library/windows/desktop/dn742486.aspx#sizingandspacing
+#define comboboxWidth 107	/* this is actually the shorter progress bar width, but Microsoft only indicates as wide as necessary; LONGTERM */
+#define comboboxHeight 14	/* LONGTERM: is this too high? */
+
+static void uiComboboxMinimumSize(uiWindowsControl *cc, int *width, int *height)
+{
+	uiCombobox *c = uiCombobox(cc);
+	uiWindowsSizing sizing;
+	int x, y;
+
+	x = comboboxWidth;
+	y = comboboxHeight;
+	uiWindowsGetSizing(c->hwnd, &sizing);
+	uiWindowsSizingDlgUnitsToPixels(&sizing, &x, &y);
+	*width = x;
+	*height = y;
+}
+
+static void defaultOnSelected(uiCombobox *c, void *data)
+{
+	// do nothing
+}
+
+void uiComboboxAppend(uiCombobox *c, const char *text)
+{
+	WCHAR *wtext;
+	LRESULT res;
+
+	wtext = toUTF16(text);
+	res = SendMessageW(c->hwnd, CB_ADDSTRING, 0, (LPARAM) wtext);
+	if (res == (LRESULT) CB_ERR)
+		logLastError(L"error appending item to uiCombobox");
+	else if (res == (LRESULT) CB_ERRSPACE)
+		logLastError(L"memory exhausted appending item to uiCombobox");
+	uiFree(wtext);
+}
+
+int uiComboboxSelected(uiCombobox *c)
+{
+	LRESULT n;
+
+	n = SendMessage(c->hwnd, CB_GETCURSEL, 0, 0);
+	if (n == (LRESULT) CB_ERR)
+		return -1;
+	return n;
+}
+
+void uiComboboxSetSelected(uiCombobox *c, int n)
+{
+	// TODO error check
+	SendMessageW(c->hwnd, CB_SETCURSEL, (WPARAM) n, 0);
+}
+
+void uiComboboxOnSelected(uiCombobox *c, void (*f)(uiCombobox *c, void *data), void *data)
+{
+	c->onSelected = f;
+	c->onSelectedData = data;
+}
+
+uiCombobox *uiNewCombobox(void)
+{
+	uiCombobox *c;
+
+	uiWindowsNewControl(uiCombobox, c);
+
+	c->hwnd = uiWindowsEnsureCreateControlHWND(WS_EX_CLIENTEDGE,
+		L"combobox", L"",
+		CBS_DROPDOWNLIST | WS_TABSTOP,
+		hInstance, NULL,
+		TRUE);
+
+	uiWindowsRegisterWM_COMMANDHandler(c->hwnd, onWM_COMMAND, uiControl(c));
+	uiComboboxOnSelected(c, defaultOnSelected, NULL);
+
+	return c;
+}