Support for editable states and alias expressions for fields

app/attributes/attributecontroller.cpp

@@ -232,6 +232,20 @@ void AttributeController::flatten(
         QStringList expressions;
         QString expression = field.constraints().constraintExpression();
 
+        QgsEditFormConfig editFormConfig = layer->editFormConfig();
+        QString fieldName = field.name();
+        QgsPropertyCollection fieldProperties = editFormConfig.dataDefinedFieldProperties( fieldName );
+
+        // Retrieving field name expression
+        QgsProperty nameProperty = fieldProperties.property( QgsEditFormConfig::DataDefinedProperty::Alias );
+        QString nameExpressionString = nameProperty.expressionString();
+        QgsExpression nameExpression( nameExpressionString );
+
+        // Retrieving field editability expression
+        QgsProperty editableProperty = fieldProperties.property( QgsEditFormConfig::DataDefinedProperty::Editable );
+        QString editableExpressionString = editableProperty.expressionString();
+        QgsExpression editableExpression( editableExpressionString );
+
         if ( !expression.isEmpty() )
         {
           expressions << field.constraints().constraintExpression();
@@ -249,8 +263,10 @@ void AttributeController::flatten(
               groupName,
               parentTabRow,
               layer->attributeDisplayName( fieldIndex ),
+              nameExpression,
               editorField->showLabel(),
               !isReadOnly,
+              editableExpression,
               getEditorWidgetSetup( layer, fieldIndex ),
               fieldIndex,
               parentVisibilityExpressions // field doesn't have visibility expression itself
@@ -904,6 +920,64 @@ void AttributeController::recalculateDerivedItems( bool isFormValueChange, bool
     }
   }
 
+  // Evaluate if form items are editable
+  {
+    QMap<QUuid, std::shared_ptr<FormItem>>::iterator formItemsIterator = mFormItems.begin();
+    while ( formItemsIterator != mFormItems.end() )
+    {
+      std::shared_ptr<FormItem> item = formItemsIterator.value();
+      QgsExpression exp = item->editableExpression();
+
+      if ( !exp.expression().isEmpty() && !item->field().defaultValueDefinition().applyOnUpdate() )
+      {
+        bool editable = item->isEditable();
+        exp.prepare( &expressionContext );
+
+        if ( exp.isValid() )
+        {
+          editable = exp.evaluate( &expressionContext ).toBool();
+        }
+
+        if ( item->isEditable() != editable )
+        {
+          item->setIsEditable( editable );
+          changedFormItems << item->id();
+        }
+      }
+
+      ++formItemsIterator;
+    }
+  }
+
+  // Evaluate form items name
+  {
+    QMap<QUuid, std::shared_ptr<FormItem>>::iterator formItemsIterator = mFormItems.begin();
+    while ( formItemsIterator != mFormItems.end() )
+    {
+      std::shared_ptr<FormItem> item = formItemsIterator.value();
+      QgsExpression exp = item->nameExpression();
+
+      if ( !exp.expression().isEmpty() )
+      {
+        QString name = item->name();
+        exp.prepare( &expressionContext );
+
+        if ( exp.isValid() )
+        {
+          name = exp.evaluate( &expressionContext ).toString();
+        }
+
+        if ( item->name() != name )
+        {
+          item->setName( name );
+          changedFormItems << item->id();
+        }
+      }
+
+      ++formItemsIterator;
+    }
+  }
+
   // Evaluate form items value state - hard/soft constraints, value validity
   {
     bool containsValidationError = false;

app/attributes/attributedata.cpp

@@ -22,8 +22,10 @@ FormItem::FormItem( const QUuid &id,
                     const int parentTabId,
                     FormItem::FormItemType type,
                     const QString &name,
+                    const QgsExpression &nameExpression,
                     bool showName,
                     bool isEditable,
+                    const QgsExpression &editableExpression,
                     const QgsEditorWidgetSetup &editorWidgetSetup,
                     int fieldIndex,
                     const QgsExpression &visibilityExpression,
@@ -35,8 +37,10 @@ FormItem::FormItem( const QUuid &id,
   , mParentTabId( parentTabId )
   , mType( type )
   , mName( name )
+  , mNameExpression( nameExpression )
   , mShowName( showName )
   , mIsEditable( isEditable )
+  , mEditableExpression( editableExpression )
   , mEditorWidgetSetup( editorWidgetSetup )
   , mFieldIndex( fieldIndex )
   , mVisibilityExpression( visibilityExpression )
@@ -48,8 +52,8 @@ FormItem *FormItem::createFieldItem( const QUuid &id,
                                      const QgsField &field,
                                      const QString &groupName,
                                      int parentTabId,
-                                     const QString &name, bool showName,
-                                     bool isEditable,
+                                     const QString &name, const QgsExpression &nameExpression, bool showName,
+                                     bool isEditable, const QgsExpression &editableExpression,
                                      const QgsEditorWidgetSetup
                                      &editorWidgetSetup,
                                      int fieldIndex,
@@ -63,8 +67,10 @@ FormItem *FormItem::createFieldItem( const QUuid &id,
            parentTabId,
            FormItem::Field,
            name,
+           nameExpression,
            showName,
            isEditable,
+           editableExpression,
            editorWidgetSetup,
            fieldIndex,
            visibilityExpression,
@@ -88,8 +94,10 @@ FormItem *FormItem::createRelationItem( const QUuid &id,
     parentTabId,
     FormItem::Relation,
     name,
+    QgsExpression(),
     showName,
     true,
+    QgsExpression(),
     QgsEditorWidgetSetup(),
     -1,
     visibilityExpression,
@@ -119,8 +127,10 @@ FormItem *FormItem::createSpacerItem(
            parentTabId,
            FormItem::Spacer,
            name,
+           QgsExpression(),
            false, // label is never shown for spacer
            false,
+           QgsExpression(),
            config,
            -1,
            visibilityExpression,
@@ -153,8 +163,10 @@ FormItem *FormItem::createRichTextItem(
     parentTabId,
     FormItem::RichText,
     name,
+    QgsExpression(),
     showName,
     false,
+    QgsExpression(),
     config,
     -1,
     visibilityExpression,
@@ -175,6 +187,11 @@ QString FormItem::name() const
   return mName;
 }
 
+void FormItem::setName( QString name )
+{
+  mName = name;
+}
+
 bool FormItem::isEditable() const
 {
   return mIsEditable;
@@ -228,6 +245,11 @@ void FormItem::setVisible( bool visible )
   mVisible = visible;
 }
 
+void FormItem::setIsEditable( bool editable )
+{
+  mIsEditable = editable;
+}
+
 QUuid FormItem::id() const
 {
   return mId;
@@ -243,6 +265,16 @@ QgsExpression FormItem::visibilityExpression() const
   return mVisibilityExpression;
 }
 
+QgsExpression FormItem::nameExpression() const
+{
+  return mNameExpression;
+}
+
+QgsExpression FormItem::editableExpression() const
+{
+  return mEditableExpression;
+}
+
 bool FormItem::visible() const
 {
   return mVisible;

app/attributes/attributedata.h

@@ -57,8 +57,10 @@ class FormItem
       int parentTabId,
       FormItem::FormItemType type,
       const QString &name,
+      const QgsExpression &nameExpression,
       bool showName,
       bool isEditable,
+      const QgsExpression &editableExpression,
       const QgsEditorWidgetSetup &editorWidgetSetup,
       int fieldIndex,
       const QgsExpression &visibilityExpression,
@@ -71,8 +73,10 @@ class FormItem
       const QString &groupName,
       int parentTabId,
       const QString &name,
+      const QgsExpression &nameExpression,
       bool showName,
       bool isEditable,
+      const QgsExpression &editableExpression,
       const QgsEditorWidgetSetup &editorWidgetSetup,
       int fieldIndex,
       const QgsExpression &visibilityExpression
@@ -109,8 +113,10 @@ class FormItem
     );
 
     FormItem::FormItemType type() const;
+
     QString name() const;
-    bool isEditable() const;
+    void setName( QString name );
+
     QString editorWidgetType() const;
     QVariantMap editorWidgetConfig() const;
     int fieldIndex() const;
@@ -121,6 +127,9 @@ class FormItem
     FieldValidator::ValidationStatus validationStatus() const;
     void setValidationStatus( FieldValidator::ValidationStatus status );
 
+    bool isEditable() const;
+    void setIsEditable( bool editable );
+
     bool isVisible() const;
     void setVisible( bool visible );
 
@@ -129,6 +138,8 @@ class FormItem
     int parentTabId() const;
 
     QgsExpression visibilityExpression() const;
+    QgsExpression nameExpression() const;
+    QgsExpression editableExpression() const;
 
     bool visible() const;
 
@@ -154,15 +165,17 @@ class FormItem
     const QString mGroupName; //empty for no group, group/tab name if widget is in container
     const int mParentTabId;
     const FormItem::FormItemType mType;
-    const QString mName;
     const bool mShowName = true; // "Show label" in Widget Display group in QGIS widget settings
-    const bool mIsEditable;
     const QgsEditorWidgetSetup mEditorWidgetSetup;
     const int mFieldIndex;
     const QgsExpression mVisibilityExpression;
+    const QgsExpression mNameExpression; // Expression to define field’s display name (alias)
+    const QgsExpression mEditableExpression; // Expression to determine whether the field is editable
 
+    QString mName;
     QString mValidationMessage;
     FieldValidator::ValidationStatus mValidationStatus = FieldValidator::Valid;
+    bool mIsEditable = true;
     bool mVisible = false;
     QVariant mOriginalValue; // original unmodified value
     QVariant mRawValue;