improvments in widgets initialization

src/framework/util/color.h

@@ -30,7 +30,7 @@
 class Color
 {
 public:
-    Color() : m_rgba(0) { }
+    Color() : m_rgba(0xFFFFFFFF) { }
     Color(uint8 r, uint8 g, uint8 b, uint8 a = 0xFF) : m_r(r), m_g(g), m_b(b), m_a(a) { }
     Color(const Color& other) : m_rgba(other.m_rgba) { }
     Color(uint32 rgba) : m_rgba(rgba) { }

src/framework/util/types.h

@@ -42,8 +42,15 @@ typedef int8_t int8;
 typedef std::function<void()> SimpleCallback;
 typedef std::function<bool()> BooleanCallback;
 
-#ifndef nullptr
-#define nullptr NULL
-#endif
+// boolean with default value initializer
+template<bool def>
+struct boolean {
+    boolean() : v(def) { }
+    operator bool &() { return v; }
+    operator bool const &() const { return v; }
+    bool& operator=(const bool& o) { v = o; return v; }
+private:
+    bool v;
+};
 
 #endif