Also override MinSize() and PreferredSize().

git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@21464 a95241bf-73f2-0310-859d-f6bbb57e9c96

headers/os/interface/MenuBar.h

@@ -81,7 +81,9 @@ public:
 
 
 			// layout related
+	virtual	BSize			MinSize();
 	virtual	BSize			MaxSize();
+	virtual	BSize			PreferredSize();
 
 /*----- Private or reserved -----------------------------------------*/
 	virtual status_t		Perform(perform_code d, void *arg);

src/kits/interface/MenuBar.cpp

@@ -327,15 +327,26 @@ BMenuBar::Perform(perform_code d, void *arg)
 }
 
 
+BSize
+BMenuBar::MinSize()
+{
+	return BMenu::MinSize();
+}
+
+
 BSize
 BMenuBar::MaxSize()
 {
-	// TODO: cache the result
-	float width, height;
-	GetPreferredSize(&width, &height);
-
+	BSize size = BMenu::MaxSize();
 	return BLayoutUtils::ComposeSize(ExplicitMaxSize(),
-		BSize(B_SIZE_UNLIMITED, height));
+		BSize(B_SIZE_UNLIMITED, size.height));
+}
+
+
+BSize
+BMenuBar::PreferredSize()
+{
+	return BMenu::PreferredSize();
 }