Show feedback message when using Select by Expression, to match

Select by Form behaviour

Author: nyalldawson

src/gui/qgsexpressionselectiondialog.cpp

@@ -104,30 +104,52 @@ void QgsExpressionSelectionDialog::mActionSelect_triggered()
 {
   mLayer->selectByExpression( mExpressionBuilder->expressionText(),
                               QgsVectorLayer::SetSelection );
+  pushSelectedFeaturesMessage();
   saveRecent();
 }
 
 void QgsExpressionSelectionDialog::mActionAddToSelection_triggered()
 {
   mLayer->selectByExpression( mExpressionBuilder->expressionText(),
                               QgsVectorLayer::AddToSelection );
+  pushSelectedFeaturesMessage();
   saveRecent();
 }
 
 void QgsExpressionSelectionDialog::mActionSelectIntersect_triggered()
 {
   mLayer->selectByExpression( mExpressionBuilder->expressionText(),
                               QgsVectorLayer::IntersectSelection );
+  pushSelectedFeaturesMessage();
   saveRecent();
 }
 
 void QgsExpressionSelectionDialog::mActionRemoveFromSelection_triggered()
 {
   mLayer->selectByExpression( mExpressionBuilder->expressionText(),
                               QgsVectorLayer::RemoveFromSelection );
+  pushSelectedFeaturesMessage();
   saveRecent();
 }
 
+void QgsExpressionSelectionDialog::pushSelectedFeaturesMessage()
+{
+  int count = mLayer->selectedFeatureCount();
+  if ( count > 0 )
+  {
+    mMessageBar->pushMessage( QString(),
+                              tr( "%1 matching %2 selected" ).arg( count )
+                              .arg( count == 1 ? tr( "feature" ) : tr( "features" ) ),
+                              Qgis::Info );
+  }
+  else
+  {
+    mMessageBar->pushMessage( QString(),
+                              tr( "No matching features found" ),
+                              Qgis::Warning );
+  }
+}
+
 void QgsExpressionSelectionDialog::mButtonZoomToFeatures_clicked()
 {
   if ( mExpressionBuilder->expressionText().isEmpty() || !mMapCanvas )

src/gui/qgsexpressionselectiondialog.h

@@ -111,9 +111,11 @@ class GUI_EXPORT QgsExpressionSelectionDialog : public QDialog, private Ui::QgsE
 
   private:
     void saveRecent();
+    void pushSelectedFeaturesMessage();
     QgsVectorLayer *mLayer = nullptr;
     QgsMessageBar *mMessageBar = nullptr;
     QgsMapCanvas *mMapCanvas = nullptr;
+
 };
 
 #endif