Port item id and uuid code

python/core/layout/qgslayoutitem.sip

@@ -55,6 +55,35 @@ class QgsLayoutItem : QgsLayoutObject, QGraphicsRectItem
  :rtype: str
 %End
 
+    QString uuid() const;
+%Docstring
+ Returns the item identification string. This is a unique random string set for the item
+ upon creation.
+.. note::
+
+   There is no corresponding setter for the uuid - it's created automatically.
+.. seealso:: id()
+.. seealso:: setId()
+ :rtype: str
+%End
+
+    QString id() const;
+%Docstring
+ Returns the item's ID name. This is not necessarily unique, and duplicate ID names may exist
+ for a layout.
+.. seealso:: setId()
+.. seealso:: uuid()
+ :rtype: str
+%End
+
+    virtual void setId( const QString &id );
+%Docstring
+ Set the item's ``id`` name. This is not necessarily unique, and duplicate ID names may exist
+ for a layout.
+.. seealso:: id()
+.. seealso:: uuid()
+%End
+
     virtual void paint( QPainter *painter, const QStyleOptionGraphicsItem *itemStyle, QWidget *pWidget );
 
 %Docstring

src/core/layout/qgslayoutitem.cpp

@@ -19,12 +19,14 @@
 #include "qgslayoututils.h"
 #include <QPainter>
 #include <QStyleOptionGraphicsItem>
+#include <QUuid>
 
 #define CACHE_SIZE_LIMIT 5000
 
 QgsLayoutItem::QgsLayoutItem( QgsLayout *layout )
   : QgsLayoutObject( layout )
   , QGraphicsRectItem( 0 )
+  , mUuid( QUuid::createUuid().toString() )
 {
   // needed to access current view transform during paint operations
   setFlags( flags() | QGraphicsItem::ItemUsesExtendedStyleOption );
@@ -38,6 +40,28 @@ QgsLayoutItem::QgsLayoutItem( QgsLayout *layout )
   initConnectionsToLayout();
 }
 
+void QgsLayoutItem::setId( const QString &id )
+{
+  if ( id == mId )
+  {
+    return;
+  }
+
+  mId = id;
+  setToolTip( id );
+
+  //TODO
+#if 0
+  //inform model that id data has changed
+  if ( mComposition )
+  {
+    mComposition->itemsModel()->updateItemDisplayName( this );
+  }
+
+  emit itemChanged();
+#endif
+}
+
 void QgsLayoutItem::paint( QPainter *painter, const QStyleOptionGraphicsItem *itemStyle, QWidget * )
 {
   if ( !painter || !painter->device() )
@@ -410,8 +434,8 @@ QPointF QgsLayoutItem::positionAtReferencePoint( const QgsLayoutItem::ReferenceP
 
 bool QgsLayoutItem::writePropertiesToElement( QDomElement &element, QDomDocument &document, const QgsReadWriteContext &context ) const
 {
-// element.setAttribute( "uuid", mUuid );
-// element.setAttribute( "id", mId );
+  element.setAttribute( QStringLiteral( "uuid" ), mUuid );
+  element.setAttribute( QStringLiteral( "id" ), mId );
   element.setAttribute( QStringLiteral( "referencePoint" ), QString::number( static_cast< int >( mReferencePoint ) ) );
   element.setAttribute( QStringLiteral( "position" ), mItemPosition.encodePoint() );
   element.setAttribute( QStringLiteral( "size" ), mItemSize.encodeSize() );
@@ -448,8 +472,8 @@ bool QgsLayoutItem::readPropertiesFromElement( const QDomElement &element, const
 {
   readObjectPropertiesFromElement( element, document, context );
 
-// mUuid = element.attribute( "uuid", QUuid::createUuid().toString() );
-// setId( element.attribute( "id" ) );
+  mUuid = element.attribute( QStringLiteral( "uuid" ), QUuid::createUuid().toString() );
+  setId( element.attribute( QStringLiteral( "id" ) ) );
   mReferencePoint = static_cast< ReferencePoint >( element.attribute( QStringLiteral( "referencePoint" ) ).toInt() );
   attemptMove( QgsLayoutPoint::decodePoint( element.attribute( QStringLiteral( "position" ) ) ) );
   attemptResize( QgsLayoutSize::decodeSize( element.attribute( QStringLiteral( "size" ) ) ) );

src/core/layout/qgslayoutitem.h

@@ -73,6 +73,31 @@ class CORE_EXPORT QgsLayoutItem : public QgsLayoutObject, public QGraphicsRectIt
      */
     virtual QString stringType() const = 0;
 
+    /**
+     * Returns the item identification string. This is a unique random string set for the item
+     * upon creation.
+     * \note There is no corresponding setter for the uuid - it's created automatically.
+     * \see id()
+     * \see setId()
+    */
+    QString uuid() const { return mUuid; }
+
+    /**
+     * Returns the item's ID name. This is not necessarily unique, and duplicate ID names may exist
+     * for a layout.
+     * \see setId()
+     * \see uuid()
+     */
+    QString id() const { return mId; }
+
+    /**
+     * Set the item's \a id name. This is not necessarily unique, and duplicate ID names may exist
+     * for a layout.
+     * \see id()
+     * \see uuid()
+     */
+    virtual void setId( const QString &id );
+
     /**
      * Handles preparing a paint surface for the layout item and painting the item's
      * content. Derived classes must not override this method, but instead implement
@@ -300,6 +325,12 @@ class CORE_EXPORT QgsLayoutItem : public QgsLayoutObject, public QGraphicsRectIt
 
   private:
 
+    //! id (not necessarily unique)
+    QString mId;
+
+    //! Unique id
+    QString mUuid;
+
     ReferencePoint mReferencePoint = UpperLeft;
     QgsLayoutSize mFixedSize;
     QgsLayoutSize mMinimumSize;

src/core/layout/qgslayoutobject.cpp

@@ -131,7 +131,7 @@ bool QgsLayoutObject::writeObjectPropertiesToElement( QDomElement &parentElement
   }
 
   //create object element
-  QDomElement objectElement = document.createElement( "LayoutObject" );
+  QDomElement objectElement = document.createElement( QStringLiteral( "LayoutObject" ) );
 
   QDomElement ddPropsElement = document.createElement( QStringLiteral( "dataDefinedProperties" ) );
   mDataDefinedProperties.writeXml( ddPropsElement, sPropertyDefinitions );
@@ -152,7 +152,7 @@ bool QgsLayoutObject::readObjectPropertiesFromElement( const QDomElement &parent
     return false;
   }
 
-  QDomNodeList objectNodeList = parentElement.elementsByTagName( "LayoutObject" );
+  QDomNodeList objectNodeList = parentElement.elementsByTagName( QStringLiteral( "LayoutObject" ) );
   if ( objectNodeList.size() < 1 )
   {
     return false;

tests/src/core/testqgslayoutitem.cpp

@@ -37,6 +37,8 @@ class TestQgsLayoutItem: public QObject
     void init();// will be called before each testfunction is executed.
     void cleanup();// will be called after every testfunction.
     void creation(); //test creation of QgsLayoutItem
+    void uuid();
+    void id();
     void registry();
     void shouldDrawDebug();
     void shouldDrawAntialiased();
@@ -180,6 +182,26 @@ void TestQgsLayoutItem::creation()
   delete layout;
 }
 
+void TestQgsLayoutItem::uuid()
+{
+  QgsProject p;
+  QgsLayout l( &p );
+
+  //basic test of uuid
+  TestItem item( &l );
+  TestItem item2( &l );
+  QVERIFY( item.uuid() != item2.uuid() );
+}
+
+void TestQgsLayoutItem::id()
+{
+  QgsProject p;
+  QgsLayout l( &p );
+  TestItem item( &l );
+  item.setId( QStringLiteral( "test" ) );
+  QCOMPARE( item.id(), QStringLiteral( "test" ) );
+}
+
 void TestQgsLayoutItem::registry()
 {
   // test QgsLayoutItemRegistry
@@ -1229,12 +1251,12 @@ void TestQgsLayoutItem::writeReadXmlProperties()
   original->attemptResize( QgsLayoutSize( 6, 8, QgsUnitTypes::LayoutCentimeters ) );
   original->attemptMove( QgsLayoutPoint( 0.05, 0.09, QgsUnitTypes::LayoutMeters ) );
   original->setItemRotation( 45.0 );
-  //original->setId( QString( "test" ) );
+  original->setId( QStringLiteral( "test" ) );
 
   QgsLayoutItem *copy = createCopyViaXml( &l, original );
 
-  //QCOMPARE( copy->uuid(), original->uuid() );
-  //QCOMPARE( copy->id(), original->id() );
+  QCOMPARE( copy->uuid(), original->uuid() );
+  QCOMPARE( copy->id(), original->id() );
   QgsProperty dd = copy->dataDefinedProperties().property( QgsLayoutObject::TestProperty );
   QVERIFY( dd );
   QVERIFY( dd.isActive() );