menu/background: backgrounds get to know the parent component

Backgrounds now know the parent control, they are painted in, to query
the size.

Backgrounds are not allowed to use glClear anymore, should only draw
something during the extend of the parent control and should take care
to do not modify the opengl cursor position.

1 files changed, 10 insertions, 3 deletions

diff --git a/src/menu/background.hpp b/src/menu/background.hpp
index 4f997700..050b7d6c 100644
--- a/src/menu/background.hpp
+++ b/src/menu/background.hpp
@@ -31,19 +31,26 @@
 
 namespace usdx
 {
+	class DrawableControl;
+
 	// Background - abstract class for Backgrounds
 	class Background : public Drawable
 	{
-	public:
-		virtual ~Background() {};
+	private:
+		const DrawableControl& parent;
 
 	protected:
 		// abstract base class
-		Background() {};
+		Background(const DrawableControl&);
 
 		// no copy and no assignment
 		Background(const Background&);
 		Background& operator=(const Background&);
+
+	public:
+		virtual ~Background();
+
+		const DrawableControl& get_parent(void) const;
 	};
 };