After a undo/redo action occurs, select the affected items

python/core/layout/qgslayoutundostack.sip

@@ -10,7 +10,8 @@
 
 
 
-class QgsLayoutUndoStack
+
+class QgsLayoutUndoStack : QObject
 {
 %Docstring
  An undo stack for QgsLayouts.
@@ -86,6 +87,19 @@ class QgsLayoutUndoStack
  :rtype: QUndoStack
 %End
 
+    void notifyUndoRedoOccurred( QgsLayoutItem *item );
+%Docstring
+ Notifies the stack that an undo or redo action occurred for a specified ``item``.
+%End
+
+  signals:
+
+    void undoRedoOccurredForItems( const QSet< QString > itemUuids );
+%Docstring
+ Emitted when an undo or redo action has occurred, which affected a
+ set of layout ``itemUuids``.
+%End
+
   private:
     QgsLayoutUndoStack( const QgsLayoutUndoStack &other );
 };

src/app/layout/qgslayoutdesignerdialog.cpp

@@ -581,6 +581,7 @@ void QgsLayoutDesignerDialog::setCurrentLayout( QgsLayout *layout )
   mLayoutToolbar->addAction( mUndoAction );
   mLayoutToolbar->addAction( mRedoAction );
 
+  connect( mLayout->undoStack(), &QgsLayoutUndoStack::undoRedoOccurredForItems, this, &QgsLayoutDesignerDialog::undoRedoOccurredForItems );
   connect( mActionClearGuides, &QAction::triggered, &mLayout->guides(), [ = ]
   {
     mLayout->guides().clear();
@@ -620,6 +621,9 @@ void QgsLayoutDesignerDialog::setIconSizes( int size )
 
 void QgsLayoutDesignerDialog::showItemOptions( QgsLayoutItem *item, bool bringPanelToFront )
 {
+  if ( mBlockItemOptions )
+    return;
+
   if ( !item )
   {
     delete mItemPropertiesStack->takeMainPanel();
@@ -1073,6 +1077,27 @@ void QgsLayoutDesignerDialog::dockVisibilityChanged( bool visible )
   }
 }
 
+void QgsLayoutDesignerDialog::undoRedoOccurredForItems( const QSet<QString> itemUuids )
+{
+  mBlockItemOptions = true;
+
+  mLayout->deselectAll();
+  QgsLayoutItem *focusItem = nullptr;
+  for ( const QString &uuid : itemUuids )
+  {
+    QgsLayoutItem *item = mLayout->itemByUuid( uuid );
+    if ( !item )
+      continue;
+
+    item->setSelected( true );
+    focusItem = item;
+  }
+  mBlockItemOptions = false;
+
+  if ( focusItem )
+    showItemOptions( focusItem );
+}
+
 QgsLayoutView *QgsLayoutDesignerDialog::view()
 {
   return mView;

src/app/layout/qgslayoutdesignerdialog.h

@@ -245,6 +245,7 @@ class QgsLayoutDesignerDialog: public QMainWindow, private Ui::QgsLayoutDesigner
     void addPages();
     void statusMessageReceived( const QString &message );
     void dockVisibilityChanged( bool visible );
+    void undoRedoOccurredForItems( const QSet< QString > itemUuids );
 
   private:
 
@@ -312,6 +313,8 @@ class QgsLayoutDesignerDialog: public QMainWindow, private Ui::QgsLayoutDesigner
     };
     QMap< QString, PanelStatus > mPanelStatus;
 
+    bool mBlockItemOptions = false;
+
     //! Save window state
     void saveWindowState();
 

src/core/CMakeLists.txt

@@ -742,6 +742,7 @@ SET(QGIS_CORE_MOC_HDRS
   layout/qgslayoutmodel.h
   layout/qgslayoutpagecollection.h
   layout/qgslayoutobject.h
+  layout/qgslayoutundostack.h
 
   symbology/qgscptcityarchive.h
   symbology/qgssvgcache.h
@@ -1001,7 +1002,6 @@ SET(QGIS_CORE_HDRS
   layout/qgslayoutsize.h
   layout/qgslayoutsnapper.h
   layout/qgslayoutundocommand.h
-  layout/qgslayoutundostack.h
   layout/qgslayoututils.h
 
   metadata/qgslayermetadata.h

src/core/layout/qgslayoutitempicture.cpp

@@ -682,7 +682,7 @@ QString QgsLayoutItemPicture::picturePath() const
   return mSourcePath;
 }
 
-bool QgsLayoutItemPicture::writePropertiesToElement( QDomElement &elem, QDomDocument &doc, const QgsReadWriteContext &context ) const
+bool QgsLayoutItemPicture::writePropertiesToElement( QDomElement &elem, QDomDocument &, const QgsReadWriteContext &context ) const
 {
   QString imagePath = mSourcePath;
 

src/core/layout/qgslayoutitemundocommand.cpp

@@ -72,6 +72,7 @@ void QgsLayoutItemUndoCommand::restoreState( QDomDocument &stateDoc )
 
   item->readXml( stateDoc.documentElement().firstChild().toElement(), stateDoc, QgsReadWriteContext() );
   mLayout->project()->setDirty( true );
+  mLayout->undoStack()->notifyUndoRedoOccurred( item );
 }
 
 QgsLayoutItem *QgsLayoutItemUndoCommand::recreateItem( int itemType, QgsLayout *layout )

src/core/layout/qgslayoutundostack.cpp

@@ -21,10 +21,11 @@
 #include <QUndoStack>
 
 QgsLayoutUndoStack::QgsLayoutUndoStack( QgsLayout *layout )
-  : mLayout( layout )
+  : QObject()
+  , mLayout( layout )
   , mUndoStack( new QUndoStack( layout ) )
 {
-
+  connect( mUndoStack.get(), &QUndoStack::indexChanged, this, &QgsLayoutUndoStack::indexChanged );
 }
 
 void QgsLayoutUndoStack::beginMacro( const QString &commandText )
@@ -76,3 +77,17 @@ QUndoStack *QgsLayoutUndoStack::stack()
   return mUndoStack.get();
 
 }
+
+void QgsLayoutUndoStack::notifyUndoRedoOccurred( QgsLayoutItem *item )
+{
+  mUndoRedoOccurredItemUuids.insert( item->uuid() );
+}
+
+void QgsLayoutUndoStack::indexChanged()
+{
+  if ( mUndoRedoOccurredItemUuids.empty() )
+    return;
+
+  emit undoRedoOccurredForItems( mUndoRedoOccurredItemUuids );
+  mUndoRedoOccurredItemUuids.clear();
+}

src/core/layout/qgslayoutundostack.h

@@ -21,6 +21,8 @@
 #include "qgis.h"
 #include "qgis_core.h"
 #include "qgslayoutundocommand.h"
+#include "qgslayoutitem.h"
+
 #include <memory>
 
 class QgsLayout;
@@ -31,8 +33,10 @@ class QUndoStack;
  * An undo stack for QgsLayouts.
  * \since QGIS 3.0
 */
-class CORE_EXPORT QgsLayoutUndoStack
+class CORE_EXPORT QgsLayoutUndoStack : public QObject
 {
+    Q_OBJECT
+
   public:
 
     /**
@@ -98,6 +102,23 @@ class CORE_EXPORT QgsLayoutUndoStack
      */
     QUndoStack *stack();
 
+    /**
+     * Notifies the stack that an undo or redo action occurred for a specified \a item.
+     */
+    void notifyUndoRedoOccurred( QgsLayoutItem *item );
+
+  signals:
+
+    /**
+     * Emitted when an undo or redo action has occurred, which affected a
+     * set of layout \a itemUuids.
+     */
+    void undoRedoOccurredForItems( const QSet< QString > itemUuids );
+
+  private slots:
+
+    void indexChanged();
+
   private:
 
     QgsLayout *mLayout = nullptr;
@@ -106,6 +127,8 @@ class CORE_EXPORT QgsLayoutUndoStack
 
     std::vector< std::unique_ptr< QgsAbstractLayoutUndoCommand > > mActiveCommands;
 
+    QSet< QString > mUndoRedoOccurredItemUuids;
+
 #ifdef SIP_RUN
     QgsLayoutUndoStack( const QgsLayoutUndoStack &other );
 #endif

tests/src/core/testqgslayout.cpp

@@ -41,6 +41,7 @@ class TestQgsLayout: public QObject
     void addItem();
     void layoutItems();
     void layoutItemByUuid();
+    void undoRedoOccurred();
 
   private:
     QString mReport;
@@ -419,6 +420,55 @@ void TestQgsLayout::layoutItemByUuid()
   QCOMPARE( l.itemByUuid( map1->uuid() ), map1 );
 }
 
+void TestQgsLayout::undoRedoOccurred()
+{
+  // test emitting undo/redo occurred signal
+  QgsProject proj;
+  QgsLayout l( &proj );
+
+  QSignalSpy spyOccurred( l.undoStack(), &QgsLayoutUndoStack::undoRedoOccurredForItems );
+
+  QgsLayoutItemShape *item = new QgsLayoutItemShape( &l );
+  l.addLayoutItem( item );
+
+  QCOMPARE( spyOccurred.count(), 0 );
+  //adds a new undo command
+  item->setId( "test" );
+  QCOMPARE( spyOccurred.count(), 0 );
+
+  QgsLayoutItemShape *item2 = new QgsLayoutItemShape( &l );
+  l.addLayoutItem( item2 );
+  item2->setId( "test2" );
+  QCOMPARE( spyOccurred.count(), 0 );
+
+  l.undoStack()->stack()->undo();
+  QCOMPARE( spyOccurred.count(), 1 );
+  QSet< QString > items = qvariant_cast< QSet< QString > >( spyOccurred.at( 0 ).at( 0 ) );
+  QCOMPARE( items, QSet< QString >() << item2->uuid() );
+
+  l.undoStack()->stack()->redo();
+  QCOMPARE( spyOccurred.count(), 2 );
+  items = qvariant_cast< QSet< QString> >( spyOccurred.at( 1 ).at( 0 ) );
+  QCOMPARE( items, QSet< QString >() << item2->uuid() );
+
+  // macro undo
+  l.undoStack()->beginMacro( QString() );
+  item->setId( "new id" );
+  item2->setId( "new id2" );
+  l.undoStack()->endMacro();
+  QCOMPARE( spyOccurred.count(), 2 );
+
+  l.undoStack()->stack()->undo();
+  QCOMPARE( spyOccurred.count(), 3 );
+  items = qvariant_cast< QSet< QString > >( spyOccurred.at( 2 ).at( 0 ) );
+  QCOMPARE( items, QSet< QString >() << item->uuid() << item2->uuid() );
+  l.undoStack()->stack()->redo();
+  QCOMPARE( spyOccurred.count(), 4 );
+  items = qvariant_cast< QSet< QString > >( spyOccurred.at( 3 ).at( 0 ) );
+  QCOMPARE( items, QSet< QString >() << item->uuid() << item2->uuid() );
+
+}
+
 
 QGSTEST_MAIN( TestQgsLayout )
 #include "testqgslayout.moc"