[FEATURE] add uuid generator widget

python/core/qgsvectorlayer.sip

@@ -68,6 +68,7 @@ public:
     Calendar,      /* calendar widget @added in 1.5 */
     DialRange,     /* dial range @added in 1.5 */
     ValueRelation, /* value map from an table @added in 1.8 */
+    UuidGenerator, /* uuid generator - readonly and automatically intialized @added in 1.9 */
   };
    
   struct RangeData {

src/app/qgsattributetypedialog.cpp

@@ -279,6 +279,10 @@ void QgsAttributeTypeDialog::setPageForEditType( QgsVectorLayer::EditType editTy
     case QgsVectorLayer::ValueRelation:
       setPage( 12 );
       break;
+
+    case QgsVectorLayer::UuidGenerator:
+      setPage( 13 );
+      break;
   }
 }
 
@@ -419,7 +423,7 @@ void QgsAttributeTypeDialog::setIndex( int index, QgsVectorLayer::EditType editT
     break;
 
     case QgsVectorLayer::UniqueValuesEditable:
-      editableUniqueValues->setChecked( editType == QgsVectorLayer::UniqueValuesEditable );
+      editableUniqueValues->setChecked( true );
       break;
 
     case QgsVectorLayer::ValueRelation:
@@ -440,6 +444,7 @@ void QgsAttributeTypeDialog::setIndex( int index, QgsVectorLayer::EditType editT
     case QgsVectorLayer::Hidden:
     case QgsVectorLayer::TextEdit:
     case QgsVectorLayer::Calendar:
+    case QgsVectorLayer::UuidGenerator:
       break;
   }
 }
@@ -600,6 +605,9 @@ void QgsAttributeTypeDialog::accept()
       mValueRelationData.mAllowNull = valueRelationAllowNull->isChecked();
       mValueRelationData.mOrderByValue = valueRelationOrderByValue->isChecked();
       break;
+    case 13:
+      mEditType = QgsVectorLayer::UuidGenerator;
+      break;
   }
 
   QDialog::accept();

src/app/qgsvectorlayerproperties.cpp

@@ -310,6 +310,7 @@ void QgsVectorLayerProperties::attributeTypeDialog( )
     case QgsVectorLayer::Immutable:
     case QgsVectorLayer::Hidden:
     case QgsVectorLayer::Calendar:
+    case QgsVectorLayer::UuidGenerator:
       break;
   }
 
@@ -583,6 +584,7 @@ void QgsVectorLayerProperties::setupEditTypes()
   editTypeMap.insert( QgsVectorLayer::TextEdit, tr( "Text edit" ) );
   editTypeMap.insert( QgsVectorLayer::Calendar, tr( "Calendar" ) );
   editTypeMap.insert( QgsVectorLayer::ValueRelation, tr( "Value relation" ) );
+  editTypeMap.insert( QgsVectorLayer::UuidGenerator, tr( "UUID generator" ) );
 }
 
 QString QgsVectorLayerProperties::editTypeButtonText( QgsVectorLayer::EditType type )
@@ -690,6 +692,7 @@ void QgsVectorLayerProperties::apply()
       case QgsVectorLayer::Hidden:
       case QgsVectorLayer::TextEdit:
       case QgsVectorLayer::Calendar:
+      case QgsVectorLayer::UuidGenerator:
         break;
     }
   }

src/core/qgsvectorlayer.cpp

@@ -3048,37 +3048,61 @@ bool QgsVectorLayer::readSymbology( const QDomNode& node, QString& errorMessage
       EditType editType = ( EditType ) editTypeElement.attribute( "type" ).toInt();
       mEditTypes.insert( name, editType );
 
-      if ( editType == ValueMap && editTypeNode.hasChildNodes() )
+      switch ( editType )
       {
-        mValueMaps.insert( name, QMap<QString, QVariant>() );
+        case ValueMap:
+          if ( editTypeNode.hasChildNodes() )
+          {
+            mValueMaps.insert( name, QMap<QString, QVariant>() );
 
-        QDomNodeList valueMapNodes = editTypeNode.childNodes();
+            QDomNodeList valueMapNodes = editTypeNode.childNodes();
-        for ( int j = 0; j < valueMapNodes.size(); j++ )
+            for ( int j = 0; j < valueMapNodes.size(); j++ )
+            {
+              QDomElement value = valueMapNodes.at( j ).toElement();
+              mValueMaps[ name ].insert( value.attribute( "key" ), value.attribute( "value" ) );
+            }
+          }
+          break;
+
+        case EditRange:
+        case SliderRange:
+        case DialRange:
         {
-          QDomElement value = valueMapNodes.at( j ).toElement();
+          QVariant min = editTypeElement.attribute( "min" );
-          mValueMaps[ name ].insert( value.attribute( "key" ), value.attribute( "value" ) );
+          QVariant max = editTypeElement.attribute( "max" );
-        }
+          QVariant step = editTypeElement.attribute( "step" );
-      }
-      else if ( editType == EditRange || editType == SliderRange )
-      {
-        QVariant min = editTypeElement.attribute( "min" );
-        QVariant max = editTypeElement.attribute( "max" );
-        QVariant step = editTypeElement.attribute( "step" );
 
-        mRanges[ name ] = RangeData( min, max, step );
+          mRanges[ name ] = RangeData( min, max, step );
-      }
+        }
-      else if ( editType == CheckBox )
+        break;
-      {
+
-        mCheckedStates[ name ] = QPair<QString, QString>( editTypeElement.attribute( "checked" ), editTypeElement.attribute( "unchecked" ) );
+        case CheckBox:
-      }
+          mCheckedStates[ name ] = QPair<QString, QString>( editTypeElement.attribute( "checked" ), editTypeElement.attribute( "unchecked" ) );
-      else if ( editType == ValueRelation )
+          break;
-      {
+
-        QString id = editTypeElement.attribute( "layer" );
+        case ValueRelation:
-        QString key = editTypeElement.attribute( "key" );
+        {
-        QString value = editTypeElement.attribute( "value" );
+          QString id = editTypeElement.attribute( "layer" );
-        bool allowNull = editTypeElement.attribute( "allowNull" ) == "true";
+          QString key = editTypeElement.attribute( "key" );
-        bool orderByValue = editTypeElement.attribute( "orderByValue" ) == "true";
+          QString value = editTypeElement.attribute( "value" );
-        mValueRelations[ name ] = ValueRelationData( id, key, value, allowNull, orderByValue );
+          bool allowNull = editTypeElement.attribute( "allowNull" ) == "true";
+          bool orderByValue = editTypeElement.attribute( "orderByValue" ) == "true";
+          mValueRelations[ name ] = ValueRelationData( id, key, value, allowNull, orderByValue );
+        }
+        break;
+
+        case Classification:
+        case FileName:
+        case Immutable:
+        case Hidden:
+        case LineEdit:
+        case TextEdit:
+        case Calendar:
+        case Enumeration:
+        case UniqueValues:
+        case UniqueValuesEditable:
+        case UuidGenerator:
+          break;
       }
     }
   }
@@ -3297,6 +3321,7 @@ bool QgsVectorLayer::writeSymbology( QDomNode& node, QDomDocument& doc, QString&
         case Calendar:
         case Enumeration:
         case Immutable:
+        case UuidGenerator:
           break;
       }
 

src/core/qgsvectorlayer.h

@@ -105,6 +105,7 @@ class CORE_EXPORT QgsVectorLayer : public QgsMapLayer
       Calendar,      /* calendar widget @added in 1.5 */
       DialRange,     /* dial range @added in 1.5 */
       ValueRelation, /* value map from an table @added in 1.8 */
+      UuidGenerator, /* uuid generator - readonly and automatically intialized @added in 1.9 */
     };
 
     struct RangeData

src/gui/qgsattributeeditor.cpp

@@ -24,6 +24,7 @@
 #include <qgslonglongvalidator.h>
 #include <qgsfieldvalidator.h>
 #include <qgsmaplayerregistry.h>
+#include <qgslogger.h>
 
 #include <QPushButton>
 #include <QLineEdit>
@@ -40,6 +41,7 @@
 #include <QDialogButtonBox>
 #include <QSettings>
 #include <QDir>
+#include <QUuid>
 
 void QgsAttributeEditor::selectFileName()
 {
@@ -268,7 +270,6 @@ QWidget *QgsAttributeEditor::createAttributeEditor( QWidget *parent, QWidget *ed
     }
     break;
 
-
     case QgsVectorLayer::DialRange:
     case QgsVectorLayer::SliderRange:
     case QgsVectorLayer::EditRange:
@@ -365,6 +366,7 @@ QWidget *QgsAttributeEditor::createAttributeEditor( QWidget *parent, QWidget *ed
 
     case QgsVectorLayer::LineEdit:
     case QgsVectorLayer::TextEdit:
+    case QgsVectorLayer::UuidGenerator:
     case QgsVectorLayer::UniqueValuesEditable:
     case QgsVectorLayer::Immutable:
     {
@@ -404,6 +406,11 @@ QWidget *QgsAttributeEditor::createAttributeEditor( QWidget *parent, QWidget *ed
           le->setCompleter( c );
         }
 
+        if ( editType == QgsVectorLayer::UuidGenerator )
+        {
+          le->setReadOnly( true );
+        }
+
         le->setValidator( new QgsFieldValidator( le, field ) );
         myWidget = le;
       }
@@ -735,6 +742,7 @@ bool QgsAttributeEditor::setValue( QWidget *editor, QgsVectorLayer *vl, int idx,
     case QgsVectorLayer::LineEdit:
     case QgsVectorLayer::UniqueValuesEditable:
     case QgsVectorLayer::Immutable:
+    case QgsVectorLayer::UuidGenerator:
     default:
     {
       QLineEdit *le = qobject_cast<QLineEdit *>( editor );
@@ -745,12 +753,18 @@ bool QgsAttributeEditor::setValue( QWidget *editor, QgsVectorLayer *vl, int idx,
 
       QString text;
       if ( value.isNull() )
+      {
         if ( myFieldType == QVariant::Int || myFieldType == QVariant::Double || myFieldType == QVariant::LongLong )
           text = "";
+        else if ( editType == QgsVectorLayer::UuidGenerator )
+          text = QUuid::createUuid().toString();
         else
           text = nullValue;
+      }
       else
+      {
         text = value.toString();
+      }
 
       if ( le )
         le->setText( text );

src/providers/postgres/qgspostgresprovider.cpp

@@ -1736,6 +1736,7 @@ bool QgsPostgresProvider::loadFields()
                 fieldTypeName == "geometry" ||
                 fieldTypeName == "money" ||
                 fieldTypeName == "ltree" ||
+                fieldTypeName == "uuid" ||
                 fieldTypeName.startsWith( "time" ) ||
                 fieldTypeName.startsWith( "date" ) )
       {

src/ui/qgsattributetypeedit.ui

@@ -81,6 +81,11 @@
        <string>Value relation</string>
       </property>
      </item>
+     <item>
+      <property name="text">
+       <string>UUID generator</string>
+      </property>
+     </item>
     </widget>
    </item>
    <item>
@@ -92,7 +97,7 @@
       </sizepolicy>
      </property>
      <property name="currentIndex">
-      <number>12</number>
+      <number>0</number>
      </property>
      <widget class="QWidget" name="lineEditPage">
       <layout class="QVBoxLayout" name="verticalLayout_1">
@@ -596,7 +601,7 @@
        </item>
       </layout>
      </widget>
-     <widget class="QWidget" name="page">
+     <widget class="QWidget" name="valueRelationPage">
       <layout class="QGridLayout" name="gridLayout_3">
        <item row="1" column="0">
         <widget class="QLabel" name="label_5">
@@ -679,6 +684,30 @@
        </item>
       </layout>
      </widget>
+     <widget class="QWidget" name="uuidGenPage">
+      <layout class="QVBoxLayout" name="verticalLayout_14">
+       <item>
+        <widget class="QLabel" name="label_9">
+         <property name="text">
+          <string>Read-only field that generates a UUID if empty.</string>
+         </property>
+        </widget>
+       </item>
+       <item>
+        <spacer name="verticalSpacer_11">
+         <property name="orientation">
+          <enum>Qt::Vertical</enum>
+         </property>
+         <property name="sizeHint" stdset="0">
+          <size>
+           <width>20</width>
+           <height>294</height>
+          </size>
+         </property>
+        </spacer>
+       </item>
+      </layout>
+     </widget>
     </widget>
    </item>
    <item>