[symbology] resurrect symbol levels dialog (fixes #16996)

python/gui/symbology/qgssymbollevelsdialog.sip

@@ -8,13 +8,18 @@
 
 
 
+
 class QgsSymbolLevelsDialog : QDialog
 {
 
 %TypeHeaderCode
 #include "qgssymbollevelsdialog.h"
 %End
   public:
+    QgsSymbolLevelsDialog( QgsFeatureRenderer *renderer, bool usingSymbolLevels, QWidget *parent = 0 );
+%Docstring
+Constructor for QgsSymbolLevelsDialog
+%End
 
     ~QgsSymbolLevelsDialog();
 
@@ -33,8 +38,11 @@ class QgsSymbolLevelsDialog : QDialog
   protected:
 
 
+
+
   private:
     QgsSymbolLevelsDialog();
+
 };
 
 

src/gui/symbology/qgsrendererwidget.cpp

@@ -251,11 +251,9 @@ void QgsRendererWidget::changeSymbolAngle()
 
 void QgsRendererWidget::showSymbolLevelsDialog( QgsFeatureRenderer *r )
 {
-  QgsSymbolLevelsDialog dlg( r->legendSymbolItems(), r->usingSymbolLevels(), this );
-
+  QgsSymbolLevelsDialog dlg( r, r->usingSymbolLevels(), this );
   if ( dlg.exec() )
   {
-    r->setUsingSymbolLevels( dlg.usingLevels() );
     emit widgetChanged();
   }
 }

src/gui/symbology/qgsrulebasedrendererwidget.cpp

@@ -396,10 +396,12 @@ void QgsRuleBasedRendererWidget::keyPressEvent( QKeyEvent *event )
 
 void QgsRuleBasedRendererWidget::setRenderingOrder()
 {
-  QgsSymbolLevelsDialog dlg( mRenderer->legendSymbolItems(), true, this );
+  QgsSymbolLevelsDialog dlg( mRenderer, true, this );
   dlg.setForceOrderingEnabled( true );
-
-  dlg.exec();
+  if ( dlg.exec() )
+  {
+    emit widgetChanged();
+  }
 }
 
 void QgsRuleBasedRendererWidget::saveSectionWidth( int section, int oldSize, int newSize )

src/gui/symbology/qgssymbollevelsdialog.cpp

@@ -28,8 +28,9 @@
 
 ////////////////
 
-QgsSymbolLevelsDialog::QgsSymbolLevelsDialog( const QgsLegendSymbolList &list, bool usingSymbolLevels, QWidget *parent )
+QgsSymbolLevelsDialog::QgsSymbolLevelsDialog( QgsFeatureRenderer *renderer, bool usingSymbolLevels, QWidget *parent )
   : QDialog( parent )
+  , mRenderer( renderer )
   , mForceOrderingEnabled( false )
 {
   setupUi( this );
@@ -42,13 +43,17 @@ QgsSymbolLevelsDialog::QgsSymbolLevelsDialog( const QgsLegendSymbolList &list, b
   chkEnable->setChecked( usingSymbolLevels );
 
   connect( chkEnable, &QAbstractButton::clicked, this, &QgsSymbolLevelsDialog::updateUi );
+  connect( buttonBox, &QDialogButtonBox::accepted, this, &QgsSymbolLevelsDialog::apply );
   connect( buttonBox, &QDialogButtonBox::helpRequested, this, &QgsSymbolLevelsDialog::showHelp );
 
-  // only consider entries with symbols
-  Q_FOREACH ( const QgsLegendSymbolItem &item, list )
+  if ( mRenderer )
   {
-    if ( item.symbol() )
-      mList << item;
+    // only consider entries with symbols
+    Q_FOREACH ( const QgsLegendSymbolItem &item, mRenderer->legendSymbolItems() )
+    {
+      if ( item.symbol() )
+        mList << item;
+    }
   }
 
   int maxLayers = 0;
@@ -128,6 +133,20 @@ void QgsSymbolLevelsDialog::updateUi()
   tableLevels->setEnabled( chkEnable->isChecked() );
 }
 
+void QgsSymbolLevelsDialog::apply()
+{
+  for ( int i = 0; i < mList.count(); i++ )
+  {
+    QgsSymbol *sym = mList.at( i ).symbol();
+    for ( int layer = 0; layer < sym->symbolLayerCount(); layer++ )
+    {
+      mRenderer->setLegendSymbolItem( mList.at( i ).ruleKey(), sym->clone() );
+    }
+  }
+
+  mRenderer->setUsingSymbolLevels( usingLevels() );
+}
+
 void QgsSymbolLevelsDialog::setDefaultLevels()
 {
   for ( int i = 0; i < mList.count(); i++ )

src/gui/symbology/qgssymbollevelsdialog.h

@@ -20,8 +20,9 @@
 #include <QList>
 #include <QItemDelegate>
 
-#include "qgsrenderer.h"
 #include "qgshelp.h"
+#include "qgsrenderer.h"
+
 #include "ui_qgssymbollevelsdialogbase.h"
 #include "qgis_gui.h"
 
@@ -32,8 +33,8 @@ class GUI_EXPORT QgsSymbolLevelsDialog : public QDialog, private Ui::QgsSymbolLe
 {
     Q_OBJECT
   public:
-    //! \note not available in Python bindings
-    QgsSymbolLevelsDialog( const QgsLegendSymbolList &list, bool usingSymbolLevels, QWidget *parent = nullptr ) SIP_SKIP;
+    //! Constructor for QgsSymbolLevelsDialog
+    QgsSymbolLevelsDialog( QgsFeatureRenderer *renderer, bool usingSymbolLevels, QWidget *parent = nullptr );
 
     ~QgsSymbolLevelsDialog();
 
@@ -48,6 +49,9 @@ class GUI_EXPORT QgsSymbolLevelsDialog : public QDialog, private Ui::QgsSymbolLe
     void renderingPassChanged( int row, int column );
 
   private slots:
+    //! Apply button
+    void apply();
+
     void showHelp();
 
   protected:
@@ -58,13 +62,17 @@ class GUI_EXPORT QgsSymbolLevelsDialog : public QDialog, private Ui::QgsSymbolLe
 
     //! maximal number of layers from all symbols
     int mMaxLayers;
+
+    QgsFeatureRenderer *mRenderer;
     QgsLegendSymbolList mList;
+
     //! whether symbol layers always should be used (default false)
     bool mForceOrderingEnabled;
 
   private:
 #ifdef SIP_RUN
     QgsSymbolLevelsDialog();
+
 #endif
 };