Default implementations of minimumSize() , maximumSize() in Layout and correct implementations of minimumSize() , maximumSize() in Widget to match equivalents in QLayout , QWidget.

svn path=/trunk/KDE/kdebase/workspace/libs/plasma/; revision=703547

widgets/layout.cpp

@@ -18,6 +18,8 @@
 
 #include "layout.h"
 
+#include <math.h>
+
 #include <QtCore/QList>
 
 namespace Plasma
@@ -99,4 +101,13 @@ LayoutItem *Layout::parent() const
 	return d->parent;
 }
 
+QSizeF Layout::minimumSize() const
+{
+    return QSizeF(0,0);
+}
+QSizeF Layout::maximumSize() const
+{
+    return QSizeF(INFINITY,INFINITY);
+}
+
 }

widgets/layout.h

@@ -132,7 +132,17 @@ class PLASMA_EXPORT Layout : public LayoutItem
 
         /** Triggers an update of the layout. */ 
         void update();
-       
+
+        /** 
+         * Returns the minimum size of this layout.
+         * The default implementation allows unlimited resizing.
+         */
+        virtual QSizeF minimumSize() const;
+        /**
+         * Returns the maximum size of this layout.  The default
+         * implementation allows unlimited resizing.
+         */
+        virtual QSizeF maximumSize() const;       
 	private:
 		class Private;
 		Private *const d;

widgets/widget.cpp

@@ -38,7 +38,9 @@ class Widget::Private
 {
     public:
         Private()
-            : parent(0)
+            : minimumSize(0,0)
+            , maximumSize(INFINITY,INFINITY)
+            , parent(0)
             , opacity(1.0)
         { }
         ~Private() { }