segmented bar: Allow for subclasses to override segment size

... e.g. when adding another text label to a segment, e.g. a unit size.

src/controls/QskSegmentedBarSkinlet.cpp

@@ -212,23 +212,11 @@ QSizeF QskSegmentedBarSkinlet::segmentSizeHint(
 {
     using Q = QskSegmentedBar;
 
-    const QSizeF sizeSymbol =
-        bar->symbolHint( Q::Icon | Q::Selected ).defaultSize();
-
     QSizeF segmentSize;
 
     for ( int i = 0; i < bar->count(); i++ )
     {
-        const auto option = bar->optionAt( i );
-
-        auto iconSize = option.icon().graphic().defaultSize();
-        iconSize = iconSize.expandedTo( sizeSymbol );
-
-        LayoutEngine layoutEngine( bar, i );
-        layoutEngine.setGraphicTextElements( bar,
-            Q::Text, option.text(), Q::Icon, iconSize );
-
-        const auto size = layoutEngine.sizeHint( which, QSizeF() );
+        const auto size = sampleSizeHint( bar, which, QSizeF(), Q::Segment, i );
         segmentSize = segmentSize.expandedTo( size );
     }
 
@@ -338,6 +326,30 @@ QskAspect::States QskSegmentedBarSkinlet::sampleStates(
     return states;
 }
 
+QSizeF QskSegmentedBarSkinlet::sampleSizeHint( const QskSkinnable* skinnable,
+    Qt::SizeHint which, const QSizeF& constraint, QskAspect::Subcontrol, int index ) const
+{
+    if ( which != Qt::PreferredSize )
+        return QSizeF();
+
+    using Q = QskSegmentedBar;
+    auto bar = static_cast< const QskSegmentedBar* >( skinnable );
+    const auto option = bar->optionAt( index );
+
+    const QSizeF sizeSymbol =
+        bar->symbolHint( Q::Icon | Q::Selected ).defaultSize();
+
+    auto iconSize = option.icon().graphic().defaultSize();
+    iconSize = iconSize.expandedTo( sizeSymbol );
+
+    LayoutEngine layoutEngine( bar, index );
+    layoutEngine.setGraphicTextElements( bar,
+        Q::Text, option.text(), Q::Icon, iconSize );
+
+    const auto size = layoutEngine.sizeHint( which, constraint );
+    return size;
+}
+
 QSGNode* QskSegmentedBarSkinlet::updateSampleNode( const QskSkinnable* skinnable,
     QskAspect::Subcontrol subControl, int index, QSGNode* node ) const
 {

src/controls/QskSegmentedBarSkinlet.h

@@ -47,6 +47,9 @@ class QSK_EXPORT QskSegmentedBarSkinlet : public QskSkinlet
     QskAspect::States sampleStates( const QskSkinnable*,
         QskAspect::Subcontrol, int index ) const override;
 
+    QSizeF sampleSizeHint( const QskSkinnable*, Qt::SizeHint, const QSizeF&,
+        QskAspect::Subcontrol, int ) const override;
+
   protected:
     QSGNode* updateSubNode( const QskSkinnable*,
         quint8 nodeRole, QSGNode* ) const override;

src/controls/QskSkinlet.cpp

@@ -867,6 +867,12 @@ QVariant QskSkinlet::sampleAt( const QskSkinnable*,
     return QVariant();
 }
 
+QSizeF QskSkinlet::sampleSizeHint( const QskSkinnable*,
+    Qt::SizeHint, const QSizeF&, QskAspect::Subcontrol, int ) const
+{
+    return QSizeF();
+}
+
 QSizeF QskSkinlet::hintWithoutConstraint(
     const QSizeF& hint, const QSizeF& constraint ) const
 {

src/controls/QskSkinlet.h

@@ -66,6 +66,9 @@ class QSK_EXPORT QskSkinlet
     virtual QVariant sampleAt( const QskSkinnable*,
         QskAspect::Subcontrol, int index ) const;
 
+    virtual QSizeF sampleSizeHint( const QskSkinnable*,
+        Qt::SizeHint, const QSizeF&, QskAspect::Subcontrol, int ) const;
+
     const QVector< quint8 >& nodeRoles() const;
 
     void setOwnedBySkinnable( bool on );