Hide invalid constraints label when it's unused

Fix #15452

Author: m-kuhn

src/gui/qgsattributeform.cpp

@@ -780,12 +780,13 @@ bool QgsAttributeForm::currentFormFeature( QgsFeature &feature )
 
 void QgsAttributeForm::clearInvalidConstraintsMessage()
 {
+  mInvalidConstraintMessage->hide();
   mInvalidConstraintMessage->clear();
   mInvalidConstraintMessage->setStyleSheet( QString() );
 }
 
-void QgsAttributeForm::displayInvalidConstraintMessage( const QStringList &f,
-    const QStringList &d )
+void QgsAttributeForm::displayInvalidConstraintMessage( const QStringList& f,
+    const QStringList& d )
 {
   clearInvalidConstraintsMessage();
 
@@ -801,6 +802,7 @@ void QgsAttributeForm::displayInvalidConstraintMessage( const QStringList &f,
   QString title = QString( "<img src=\"%1\">     <b>%2:" ).arg( icPath ).arg( tr( "Invalid fields" ) );
   QString msg = QString( "%1</b><ul>%2</ul>" ).arg( title ).arg( descriptions ) ;
 
+  mInvalidConstraintMessage->show();
   mInvalidConstraintMessage->setText( msg );
   mInvalidConstraintMessage->setStyleSheet( "QLabel { background-color : #ffc800; }" );
 }
@@ -919,8 +921,8 @@ void QgsAttributeForm::onConstraintStatusChanged( const QString& constraint,
   }
 }
 
-void QgsAttributeForm::constraintDependencies( QgsEditorWidgetWrapper *w,
-    QList<QgsEditorWidgetWrapper*> &wDeps )
+void QgsAttributeForm::constraintDependencies( QgsEditorWidgetWrapper* w,
+    QList<QgsEditorWidgetWrapper*>& wDeps )
 {
   QString name =  w->field().name();
 
@@ -1048,6 +1050,7 @@ void QgsAttributeForm::init()
   vl->addWidget( mMessageBar );
 
   mInvalidConstraintMessage = new QLabel( this );
+  mInvalidConstraintMessage->hide();
   vl->addWidget( mInvalidConstraintMessage );
 
   setLayout( vl );

src/gui/qgsattributeform.h

@@ -321,13 +321,13 @@ class GUI_EXPORT QgsAttributeForm : public QWidget
 
     //! constraints management
     void updateAllConstaints();
-    void updateConstraints( QgsEditorWidgetWrapper *w );
-    bool currentFormFeature( QgsFeature &feature );
-    bool currentFormValidConstraints( QStringList &invalidFields, QStringList &descriptions );
-    void constraintDependencies( QgsEditorWidgetWrapper *w, QList<QgsEditorWidgetWrapper*> &wDeps );
+    void updateConstraints( QgsEditorWidgetWrapper* w );
+    bool currentFormFeature( QgsFeature& feature );
+    bool currentFormValidConstraints( QStringList& invalidFields, QStringList& descriptions );
+    void constraintDependencies( QgsEditorWidgetWrapper* w, QList<QgsEditorWidgetWrapper*>& wDeps );
     void clearInvalidConstraintsMessage();
-    void displayInvalidConstraintMessage( const QStringList &invalidFields,
-                                          const QStringList &description );
+    void displayInvalidConstraintMessage( const QStringList& invalidFields,
+                                          const QStringList& description );
 
     QgsVectorLayer* mLayer;
     QgsFeature mFeature;