dynamic constraints for QskStackBox added

src/layouts/QskStackBox.cpp

@@ -7,6 +7,8 @@
 #include "QskStackBoxAnimator.h"
 #include "QskLayoutItem.h"
 #include "QskLayoutEngine.h"
+#include "QskLayoutConstraint.h"
+
 #include <QPointer>
 
 class QskStackBox::PrivateData
@@ -237,6 +239,36 @@ QSizeF QskStackBox::contentsSizeHint() const
     return QSizeF( width, height );
 }
 
+qreal QskStackBox::heightForWidth( qreal width ) const
+{
+    qreal height = -1;
+
+    const QskLayoutEngine& engine = this->engine();
+    for ( int i = 0; i < engine.itemCount(); i++ )
+    {
+        const QskLayoutItem* layoutItem = engine.layoutItemAt( i );
+        if ( const auto item = layoutItem->item() )
+            height = qMax( height, QskLayoutConstraint::heightForWidth( item, width ) );
+    }
+
+    return height;
+}
+
+qreal QskStackBox::widthForHeight( qreal height ) const
+{
+    qreal width = -1;
+
+    const QskLayoutEngine& engine = this->engine();
+    for ( int i = 0; i < engine.itemCount(); i++ )
+    {
+        const QskLayoutItem* layoutItem = engine.layoutItemAt( i );
+        if ( const auto item = layoutItem->item() )
+            width = qMax( width, QskLayoutConstraint::widthForHeight( item, height ) );
+    }
+
+    return width;
+}
+
 void QskStackBox::layoutItemInserted( QskLayoutItem* layoutItem, int index )
 {
     Q_UNUSED( index )

src/layouts/QskStackBox.h

@@ -34,6 +34,9 @@ public:
 
     virtual QSizeF contentsSizeHint() const override;
 
+    virtual qreal heightForWidth( qreal width ) const override;
+    virtual qreal widthForHeight( qreal height ) const override;
+
     void setAnimator( QskStackBoxAnimator* );
     const QskStackBoxAnimator* animator() const;
     QskStackBoxAnimator* animator();