Add IGUIElement::bringToBack (patch written by DtD, although I'm to blame for the function-name)

git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@3356 dfc29bdd-3216-0410-991c-e03cc46cb475

changes.txt

+ - Add IGUIElement::bringToBack (patch written by DtD, although I'm to blame for the function-name)
+
 -----------------------------
-Changes in 1.7.1 (05.07.2010) TA 
+Changes in 1.7.1 (05.07.2010) TA (eh... why 1.7.1? Trunk is for 1.8)
 	- BurningVideo 
 		- add Normalmap Rendering ( one light only), pushed Burningvideo to 0.46
 		- add Stencil Shadow Rendering (one color only and 32 bit only), pushed Burningvideo to 0.47

include/IGUIElement.h

@@ -538,6 +538,27 @@ public:
 	}
 
 
+	//! Moves a child to the back, so it's siblings are drawn on top of it
+	/** \return True if successful, false if not. */
+	virtual bool bringToBack(IGUIElement* child)
+	{
+		core::list<IGUIElement*>::Iterator it = Children.begin();
+		if (child == (*it))	// already there
+			return true;
+		for (; it != Children.end(); ++it)
+		{
+			if (child == (*it))
+			{
+				Children.erase(it);
+				Children.push_front(child);
+				return true;
+			}
+		}
+
+		_IRR_IMPLEMENT_MANAGED_MARSHALLING_BUGFIX;
+		return false;
+	}
+
 	//! Returns list with children of this element
 	virtual const core::list<IGUIElement*>& getChildren() const
 	{