Show item size in status bar when creating a new item

python/gui/gui_auto.sip

@@ -46,7 +46,6 @@
 %Include layertree/qgslayertreeembeddedconfigwidget.sip
 %Include layertree/qgslayertreeembeddedwidgetregistry.sip
 %Include layout/qgslayoutviewmouseevent.sip
-%Include layout/qgslayoutviewrubberband.sip
 %Include raster/qgsrasterrendererwidget.sip
 %Include symbology/qgssymbolwidgetcontext.sip
 %Include qgisinterface.sip
@@ -295,6 +294,7 @@
 %Include layout/qgslayoutruler.sip
 %Include layout/qgslayoutunitscombobox.sip
 %Include layout/qgslayoutview.sip
+%Include layout/qgslayoutviewrubberband.sip
 %Include layout/qgslayoutviewtool.sip
 %Include layout/qgslayoutviewtooladditem.sip
 %Include layout/qgslayoutviewtooladdnodeitem.sip

python/gui/layout/qgslayoutviewrubberband.sip

@@ -10,7 +10,7 @@
 
 
 
-class QgsLayoutViewRubberBand
+class QgsLayoutViewRubberBand : QObject
 {
 %Docstring
 QgsLayoutViewRubberBand is an abstract base class for temporary rubber band items
@@ -109,6 +109,16 @@ Sets the ``pen`` used for drawing the rubber band.
 .. seealso:: :py:func:`pen`
 
 .. seealso:: :py:func:`setBrush`
+%End
+
+  signals:
+
+    void sizeChanged( const QString &size );
+%Docstring
+Emitted when the size of the rubber band is changed. The ``size``
+argument gives a translated string describing the new rubber band size,
+with a format which differs per subclass (e.g. rectangles may describe
+a size using width and height, while circles may describe a size by radius).
 %End
 
   protected:

src/gui/CMakeLists.txt

@@ -690,6 +690,7 @@ SET(QGIS_GUI_MOC_HDRS
   layout/qgslayoutruler.h
   layout/qgslayoutunitscombobox.h
   layout/qgslayoutview.h
+  layout/qgslayoutviewrubberband.h
   layout/qgslayoutviewtool.h
   layout/qgslayoutviewtooladditem.h
   layout/qgslayoutviewtooladdnodeitem.h
@@ -804,7 +805,6 @@ SET(QGIS_GUI_HDRS
 
   layout/qgslayoutreportsectionlabel.h
   layout/qgslayoutviewmouseevent.h
-  layout/qgslayoutviewrubberband.h
 
   raster/qgsrasterrendererwidget.h
 

src/gui/layout/qgslayoutviewrubberband.cpp

@@ -169,6 +169,8 @@ void QgsLayoutViewRectangularRubberBand::update( QPointF position, Qt::KeyboardM
   QTransform t;
   t.translate( newRect.x(), newRect.y() );
   mRubberBandItem->setTransform( t );
+
+  emit sizeChanged( tr( "width: %1 %3 height: %2 %3" ).arg( newRect.width() ).arg( newRect.height() ).arg( QgsUnitTypes::toAbbreviatedString( layout()->units() ) ) );
 }
 
 QRectF QgsLayoutViewRectangularRubberBand::finish( QPointF position, Qt::KeyboardModifiers modifiers )
@@ -234,6 +236,8 @@ void QgsLayoutViewEllipticalRubberBand::update( QPointF position, Qt::KeyboardMo
   QTransform t;
   t.translate( newRect.x(), newRect.y() );
   mRubberBandItem->setTransform( t );
+
+  emit sizeChanged( tr( "width: %1 %3 height: %2 %3" ).arg( newRect.width() ).arg( newRect.height() ).arg( QgsUnitTypes::toAbbreviatedString( layout()->units() ) ) );
 }
 
 QRectF QgsLayoutViewEllipticalRubberBand::finish( QPointF position, Qt::KeyboardModifiers modifiers )
@@ -309,6 +313,8 @@ void QgsLayoutViewTriangleRubberBand::update( QPointF position, Qt::KeyboardModi
   QTransform t;
   t.translate( newRect.x(), newRect.y() );
   mRubberBandItem->setTransform( t );
+
+  emit sizeChanged( tr( "width: %1 %3 height: %2 %3" ).arg( newRect.width() ).arg( newRect.height() ).arg( QgsUnitTypes::toAbbreviatedString( layout()->units() ) ) );
 }
 
 QRectF QgsLayoutViewTriangleRubberBand::finish( QPointF position, Qt::KeyboardModifiers modifiers )

src/gui/layout/qgslayoutviewrubberband.h

@@ -22,6 +22,7 @@
 #include "qgis_sip.h"
 #include <QBrush>
 #include <QPen>
+#include <QObject>
 
 class QgsLayoutView;
 class QGraphicsRectItem;
@@ -35,9 +36,11 @@ class QgsLayout;
  * in various shapes, for use within QgsLayoutView widgets.
  * \since QGIS 3.0
  */
-class GUI_EXPORT QgsLayoutViewRubberBand
+class GUI_EXPORT QgsLayoutViewRubberBand : public QObject
 {
 
+    Q_OBJECT
+
 #ifdef SIP_RUN
     SIP_CONVERT_TO_SUBCLASS_CODE
     if ( dynamic_cast<QgsLayoutViewMouseEvent *>( sipCpp ) )
@@ -120,6 +123,16 @@ class GUI_EXPORT QgsLayoutViewRubberBand
      */
     void setPen( const QPen &pen );
 
+  signals:
+
+    /**
+     * Emitted when the size of the rubber band is changed. The \a size
+     * argument gives a translated string describing the new rubber band size,
+     * with a format which differs per subclass (e.g. rectangles may describe
+     * a size using width and height, while circles may describe a size by radius).
+     */
+    void sizeChanged( const QString &size );
+
   protected:
 
     /**

src/gui/layout/qgslayoutviewtooladditem.cpp

@@ -56,6 +56,10 @@ void QgsLayoutViewToolAddItem::layoutPressEvent( QgsLayoutViewMouseEvent *event
   mRubberBand.reset( QgsGui::layoutItemGuiRegistry()->createItemRubberBand( mItemMetadataId, view() ) );
   if ( mRubberBand )
   {
+    connect( mRubberBand.get(), &QgsLayoutViewRubberBand::sizeChanged, this, [ = ]( const QString & size )
+    {
+      view()->pushStatusMessage( size );
+    } );
     mRubberBand->start( event->snappedPoint(), event->modifiers() );
   }
 }