Create barebones example

examples/helloworld/main.c

@@ -0,0 +1,57 @@
+#include <stdio.h>
+#include <string.h>
+#include "../../ui.h"
+
+static uiWindow *mainwin;
+
+static int onClosing(uiWindow *w, void *data)
+{
+	uiControlDestroy(uiControl(mainwin));
+	uiQuit();
+	return 0;
+}
+
+static int shouldQuit(void *data)
+{
+	uiControlDestroy(uiControl(mainwin));
+	return 1;
+}
+
+int main(void)
+{
+	uiInitOptions o;
+	const char *err;
+	uiMenu *menu;
+	uiMenuItem *item;
+	uiBox *box;
+    uiLabel *label;
+
+	memset(&o, 0, sizeof (uiInitOptions));
+	err = uiInit(&o);
+	if (err != NULL) {
+		fprintf(stderr, "error initializing ui: %s\n", err);
+		uiFreeInitError(err);
+		return 1;
+	}
+
+	menu = uiNewMenu("File");
+    item = uiMenuAppendItem(menu, "Item");
+	item = uiMenuAppendQuitItem(menu);
+	uiOnShouldQuit(shouldQuit, NULL);
+
+	mainwin = uiNewWindow("Window", 640, 480, 1);
+	uiWindowSetMargined(mainwin, 1);
+	uiWindowOnClosing(mainwin, onClosing, NULL);
+
+	box = uiNewVerticalBox();
+	uiBoxSetPadded(box, 1);
+	uiWindowSetChild(mainwin, uiControl(box));
+
+    label = uiNewLabel("Hello, World!");
+    uiBoxAppend(box, uiControl(label), 0);
+
+	uiControlShow(uiControl(mainwin));
+	uiMain();
+	uiUninit();
+	return 0;
+}