QskControl::maybeUnresized() added

src/controls/QskControl.cpp

@@ -210,7 +210,9 @@ class QskControlPrivate final : public QQuickItemPrivate
 
 #if 0
     // can we do something useful with overloading ???
+
     QSGTransformNode* createTransformNode() override;
+    void transformChanged() override;
 #endif
 
     void implicitWidthChanged() override;
@@ -227,12 +229,13 @@ class QskControlPrivate final : public QQuickItemPrivate
             sizeof( QQuickItemPrivate::ExtraData ) -> 184
             sizeof( QQuickItemPrivate ) -> 320
 
+            ( these numbers include pointers to optional extra data, but not
+              the size for the extra data. So the effective memory footprint,
+              is often even worse ).
+
             sizeof( QskControlPrivate ) -> sizeof( QQuickItemPrivate ) + 32
             sizeof( QskSkinnable::PrivateData ) -> 40
 
-            ( these numbers include pointers to optional extra data, that might
-              increase the effective memory footprint, when being accurate ).
-
         It might be possible to save some bytes, but in the end QskControl
         is heavy simply because of deriving from QQuickItem. So without
         patching Qt the only way to limit the memory footprint of an application
@@ -1648,6 +1651,26 @@ void QskControl::componentComplete()
     Inherited::componentComplete();
 }
 
+bool QskControl::maybeUnresized() const
+{
+    Q_D( const QskControl );
+
+    if ( d->width <= 0.0 && d->height <= 0.0 )
+    {
+        /*
+            Unfortunately the list of items to-be-polished is not processed
+            in top/down order and we might run into updatePolish() before
+            having a proper size. But when the parentItem() is waiting
+            for to-be-polished, we assume, that we will be resized then
+            and run into another updatePolish() then.
+         */
+        if ( d->polishOnResize && qskIsPolishScheduled( parentItem() ) )
+            return true;
+    }
+
+    return false;
+}
+
 void QskControl::releaseResources()
 {
     Inherited::releaseResources();
@@ -1847,7 +1870,7 @@ void QskControl::updatePolish()
 
     d->blockedPolish = false;
 
-    if ( d->autoLayoutChildren )
+    if ( d->autoLayoutChildren && !maybeUnresized() )
     {
         const QRectF rect = layoutRect();
 
@@ -1951,6 +1974,16 @@ QskControl* QskControl::owningControl() const
     return const_cast< QskControl* >( this );
 }
 
+QRectF QskControl::layoutRect() const
+{
+    Q_D( const QskControl );
+
+    if ( d->width <= 0.0 && d->height <= 0.0 )
+        return QRectF();
+
+    return layoutRectForSize( size() );
+}
+
 QRectF QskControl::layoutRectForSize( const QSizeF& size ) const
 {
     const QRectF r( 0.0, 0.0, size.width(), size.height() );

src/controls/QskControl.h

@@ -260,6 +260,8 @@ class QSK_EXPORT QskControl : public QQuickItem, public QskSkinnable
     virtual void aboutToShow();  // called in updatePolish
     virtual void updateLayout(); // called in updatePolish
 
+    bool maybeUnresized() const;
+
   private:
     // don't use boundingRect - it seems to be deprecated
     QRectF boundingRect() const override final { return rect(); }
@@ -322,11 +324,6 @@ inline QSizeF QskControl::preferredSize() const
     return explicitSizeHint( Qt::PreferredSize );
 }
 
-inline QRectF QskControl::layoutRect() const
-{
-    return layoutRectForSize( size() );
-}
-
 inline QskControl* qskControlCast( QObject* object )
 {
     return qobject_cast< QskControl* >( object );

src/controls/QskTabView.cpp

@@ -246,6 +246,9 @@ bool QskTabView::event( QEvent* event )
 
 void QskTabView::updateLayout()
 {
+    if ( maybeUnresized() )
+        return; 
+
     m_data->tabBar->setGeometry( subControlRect( TabBar ) );
 
 #if 1

src/layouts/QskGridBox.cpp

@@ -404,6 +404,7 @@ void QskGridBox::invalidate()
 
 void QskGridBox::updateLayout()
 {
+    if ( !maybeUnresized() )
         m_data->engine.setGeometries( layoutRect() );
 }
 

src/layouts/QskLinearBox.cpp

@@ -198,6 +198,7 @@ void QskLinearBox::invalidate()
 
 void QskLinearBox::updateLayout()
 {
+    if ( !maybeUnresized() )
         m_data->engine.setGeometries( layoutRect() );
 }
 
@@ -479,7 +480,6 @@ void QskLinearBox::insertItem(
             item->stackAfter( children.last() );
     }
 
-
     qskSetItemActive( this, item, true );
 
 #if 1

src/layouts/QskStackBox.cpp

@@ -408,6 +408,9 @@ QRectF QskStackBox::geometryForItemAt( int index ) const
 
 void QskStackBox::updateLayout()
 {
+    if ( maybeUnresized() )
+        return;
+
     const auto idx = m_data->currentIndex;
 
     if ( idx >= 0 )