Merge e5e3b9a44a8bb26da7cdacc3fb545b090d991836 into 74549aad26c3358101e88477d9dfa1caae013d72

superfluous centerOn

python/PyQt6/gui/auto_generated/processing/models/qgsmodelgraphicsscene.sip.in

@@ -173,6 +173,16 @@ full details (``longMessage``).
 %Docstring
 Requests a complete rebuild of a model by emitting the according signal
 
+.. versionadded:: 3.44
+%End
+
+    void updateBounds();
+%Docstring
+Updates the scene rect based on the bounds of the model.
+
+The bounding rectangle of the model is calculated off all components of
+the model, with an additional margin arounds items.
+
 .. versionadded:: 3.44
 %End
 

python/PyQt6/gui/auto_generated/processing/models/qgsmodelgraphicsview.sip.in

@@ -57,6 +57,15 @@ widget.
     void setModelScene( QgsModelGraphicsScene *scene );
 %Docstring
 Sets the related ``scene``.
+%End
+
+    void friendlySetSceneRect();
+%Docstring
+Sets the scene rect used for scrollbar without disturbing the user i.e:
+- We growth the scene rect as the model growth - We shrink only if the
+model scene rect is outside the current viewed viewport
+
+Called each time the view viewport moved or the model scene changed
 %End
 
     QgsModelGraphicsScene *modelScene() const;
@@ -134,12 +143,10 @@ Pastes items from clipboard, using the specified ``mode``.
 %End
 
   public slots:
-
     void snapSelected();
 %Docstring
 Snaps the selected items to the grid.
 %End
-
   signals:
 
     void algorithmDropped( const QString &algorithmId, const QPointF &pos );

python/gui/auto_generated/processing/models/qgsmodelgraphicsscene.sip.in

@@ -173,6 +173,16 @@ full details (``longMessage``).
 %Docstring
 Requests a complete rebuild of a model by emitting the according signal
 
+.. versionadded:: 3.44
+%End
+
+    void updateBounds();
+%Docstring
+Updates the scene rect based on the bounds of the model.
+
+The bounding rectangle of the model is calculated off all components of
+the model, with an additional margin arounds items.
+
 .. versionadded:: 3.44
 %End
 

python/gui/auto_generated/processing/models/qgsmodelgraphicsview.sip.in

@@ -57,6 +57,15 @@ widget.
     void setModelScene( QgsModelGraphicsScene *scene );
 %Docstring
 Sets the related ``scene``.
+%End
+
+    void friendlySetSceneRect();
+%Docstring
+Sets the scene rect used for scrollbar without disturbing the user i.e:
+- We growth the scene rect as the model growth - We shrink only if the
+model scene rect is outside the current viewed viewport
+
+Called each time the view viewport moved or the model scene changed
 %End
 
     QgsModelGraphicsScene *modelScene() const;
@@ -134,12 +143,10 @@ Pastes items from clipboard, using the specified ``mode``.
 %End
 
   public slots:
-
     void snapSelected();
 %Docstring
 Snaps the selected items to the grid.
 %End
-
   signals:
 
     void algorithmDropped( const QString &algorithmId, const QPointF &pos );

python/plugins/processing/modeler/ModelerDialog.py

@@ -71,7 +71,6 @@ pluginPath = os.path.split(os.path.dirname(__file__))[0]
 
 
 class ModelerDialog(QgsModelDesignerDialog):
-    CANVAS_SIZE = 4000
 
     update_model = pyqtSignal()
 
@@ -97,7 +96,6 @@ class ModelerDialog(QgsModelDesignerDialog):
             self.setStyleSheet(iface.mainWindow().styleSheet())
 
         scene = ModelerScene(self)
-        scene.setSceneRect(QRectF(0, 0, self.CANVAS_SIZE, self.CANVAS_SIZE))
         self.setModelScene(scene)
 
         self.view().ensureVisible(0, 0, 10, 10)
@@ -244,8 +242,6 @@ class ModelerDialog(QgsModelDesignerDialog):
 
     def repaintModel(self, showControls=True):
         scene = ModelerScene(self)
-        scene.setSceneRect(QRectF(0, 0, self.CANVAS_SIZE, self.CANVAS_SIZE))
-
         if not showControls:
             scene.setFlag(QgsModelGraphicsScene.Flag.FlagHideControls)
 
@@ -259,6 +255,7 @@ class ModelerDialog(QgsModelDesignerDialog):
         self.setModelScene(scene)
         # create items later that setModelScene to setup link to messageBar to the scene
         scene.createItems(self.model(), context)
+        scene.updateBounds()
 
     def create_widget_context(self):
         """
@@ -347,7 +344,7 @@ class ModelerDialog(QgsModelDesignerDialog):
                     for i in list(self.model().parameterComponents().values())
                 ]
             )
-            newX = min(MARGIN + BOX_WIDTH + maxX, self.CANVAS_SIZE - BOX_WIDTH)
+            newX = MARGIN + BOX_WIDTH + maxX
         else:
             newX = MARGIN + BOX_WIDTH / 2
         return QPointF(newX, MARGIN + BOX_HEIGHT / 2)
@@ -415,8 +412,8 @@ class ModelerDialog(QgsModelDesignerDialog):
                     for alg in list(self.model().childAlgorithms().values())
                 ]
             )
-            newX = min(MARGIN + BOX_WIDTH + maxX, self.CANVAS_SIZE - BOX_WIDTH)
-            newY = min(MARGIN + BOX_HEIGHT + maxY, self.CANVAS_SIZE - BOX_HEIGHT)
+            newX = MARGIN + BOX_WIDTH + maxX
+            newY = MARGIN + BOX_HEIGHT + maxY
         else:
             newX = MARGIN + BOX_WIDTH / 2
             newY = MARGIN * 2 + BOX_HEIGHT + BOX_HEIGHT / 2

src/gui/processing/models/qgsmodeldesignerdialog.cpp

@@ -440,7 +440,7 @@ void QgsModelDesignerDialog::setModel( QgsProcessingModelAlgorithm *model )
 
   mGroupEdit->setText( mModel->group() );
   mNameEdit->setText( mModel->displayName() );
-  repaintModel();
+  repaintModel( true );
   updateVariablesGui();
 
   mView->centerOn( 0, 0 );
@@ -480,7 +480,6 @@ void QgsModelDesignerDialog::setModelScene( QgsModelGraphicsScene *scene )
   mScene->setModel( mModel.get() );
   mScene->setMessageBar( mMessageBar );
 
-  const QPointF center = mView->mapToScene( mView->viewport()->rect().center() );
   mView->setModelScene( mScene );
 
   mSelectTool->resetCache();
@@ -499,8 +498,6 @@ void QgsModelDesignerDialog::setModelScene( QgsModelGraphicsScene *scene )
   connect( mScene, &QgsModelGraphicsScene::showChildAlgorithmOutputs, this, &QgsModelDesignerDialog::showChildAlgorithmOutputs );
   connect( mScene, &QgsModelGraphicsScene::showChildAlgorithmLog, this, &QgsModelDesignerDialog::showChildAlgorithmLog );
 
-  mView->centerOn( center );
-
   if ( oldScene )
     oldScene->deleteLater();
 }

src/gui/processing/models/qgsmodelgraphicsscene.cpp

@@ -33,6 +33,8 @@ QgsModelGraphicsScene::QgsModelGraphicsScene( QObject *parent )
   : QGraphicsScene( parent )
 {
   setItemIndexMethod( QGraphicsScene::NoIndex );
+
+  connect( this, &QgsModelGraphicsScene::componentChanged, this, &QgsModelGraphicsScene::updateBounds );
 }
 
 QgsProcessingModelAlgorithm *QgsModelGraphicsScene::model()
@@ -60,6 +62,28 @@ void QgsModelGraphicsScene::mousePressEvent( QGraphicsSceneMouseEvent *event )
   QGraphicsScene::mousePressEvent( event );
 }
 
+void QgsModelGraphicsScene::updateBounds()
+{
+  //start with an empty rectangle
+  QRectF bounds;
+
+  //add all  items
+  const QList<QGraphicsItem *> constItems = items();
+  for ( QGraphicsItem *item : constItems )
+  {
+    QgsModelComponentGraphicItem *componentItem = dynamic_cast<QgsModelComponentGraphicItem *>( item );
+    if ( componentItem )
+      bounds = bounds.united( componentItem->sceneBoundingRect() );
+  }
+
+  if ( bounds.isValid() )
+  {
+    bounds.adjust( -SCENE_COMPONENT_MARGIN, -SCENE_COMPONENT_MARGIN, SCENE_COMPONENT_MARGIN, SCENE_COMPONENT_MARGIN );
+  }
+
+  setSceneRect( bounds );
+}
+
 QgsModelComponentGraphicItem *QgsModelGraphicsScene::createParameterGraphicItem( QgsProcessingModelAlgorithm *model, QgsProcessingModelParameter *param ) const
 {
   return new QgsModelParameterGraphicItem( param, model, nullptr );

src/gui/processing/models/qgsmodelgraphicsscene.h

@@ -181,6 +181,15 @@ class GUI_EXPORT QgsModelGraphicsScene : public QGraphicsScene
      */
     void requestRebuildRequired();
 
+    /**
+     * Updates the scene rect based on the bounds of the model.
+
+     * The bounding rectangle of the model is calculated off all components of the model, with an additional margin arounds items.
+     *  
+     * \since QGIS 3.44
+     */
+    void updateBounds();
+
   signals:
 
     /**
@@ -282,6 +291,8 @@ class GUI_EXPORT QgsModelGraphicsScene : public QGraphicsScene
     QMap<QString, QgsModelComponentGraphicItem *> mGroupBoxItems;
     QgsProcessingModelResult mLastResult;
 
+    static constexpr int SCENE_COMPONENT_MARGIN = 50;
+
     QgsMessageBar *mMessageBar = nullptr;
 };
 

src/gui/processing/models/qgsmodelgraphicsview.cpp

@@ -52,6 +52,9 @@ QgsModelGraphicsView::QgsModelGraphicsView( QWidget *parent )
   mMidMouseButtonPanTool = new QgsModelViewToolTemporaryMousePan( this );
   mSpaceZoomTool = new QgsModelViewToolTemporaryKeyZoom( this );
 
+  connect( horizontalScrollBar(), &QScrollBar::sliderReleased, this, [=] { friendlySetSceneRect(); } );
+  connect( verticalScrollBar(), &QScrollBar::sliderReleased, this, [=] { friendlySetSceneRect(); } );
+
   mSnapper.setSnapToGrid( true );
 }
 
@@ -397,6 +400,8 @@ void QgsModelGraphicsView::setModelScene( QgsModelGraphicsScene *scene )
 {
   setScene( scene );
 
+  connect( scene, &QgsModelGraphicsScene::sceneRectChanged, this, [=] { friendlySetSceneRect(); } );
+
   // IMPORTANT!
   // previous snap markers, snap lines are owned by previous layout - so don't delete them here!
   mSnapMarker = new QgsModelViewSnapMarker();
@@ -468,7 +473,6 @@ void QgsModelGraphicsView::endCommand()
   emit commandEnded();
 }
 
-
 void QgsModelGraphicsView::snapSelected()
 {
   QgsModelGraphicsScene *s = modelScene();
@@ -492,6 +496,21 @@ void QgsModelGraphicsView::snapSelected()
   endMacroCommand();
 }
 
+void QgsModelGraphicsView::friendlySetSceneRect()
+{
+  QRectF modelSceneRect = modelScene()->sceneRect();
+  QRectF viewSceneRect = sceneRect();
+
+  QRectF visibleRect = mapToScene( viewport()->rect() ).boundingRect();
+
+  viewSceneRect.setLeft( std::min( modelSceneRect.left(), visibleRect.left() ) );
+  viewSceneRect.setRight( std::max( modelSceneRect.right(), visibleRect.right() ) );
+  viewSceneRect.setTop( std::min( modelSceneRect.top(), visibleRect.top() ) );
+  viewSceneRect.setBottom( std::max( modelSceneRect.bottom(), visibleRect.bottom() ) );
+
+  setSceneRect( viewSceneRect );
+}
+
 void QgsModelGraphicsView::copySelectedItems( QgsModelGraphicsView::ClipboardOperation operation )
 {
   copyItems( modelScene()->selectedComponentItems(), operation );

src/gui/processing/models/qgsmodelgraphicsview.h

@@ -66,6 +66,16 @@ class GUI_EXPORT QgsModelGraphicsView : public QGraphicsView
      */
     void setModelScene( QgsModelGraphicsScene *scene );
 
+    /**
+     * Sets the scene rect used for scrollbar without disturbing the user
+     * i.e:
+     *  - We growth the scene rect as the model growth
+     *  - We shrink only if the model scene rect is outside the current viewed viewport
+     * 
+     * Called each time the view viewport moved or the model scene changed
+     */
+    void friendlySetSceneRect();
+
     /**
      * Returns the scene associated with the tool.
      * \see view()
@@ -158,12 +168,10 @@ class GUI_EXPORT QgsModelGraphicsView : public QGraphicsView
     void pasteItems( PasteMode mode );
 
   public slots:
-
     /**
      * Snaps the selected items to the grid.
      */
     void snapSelected();
-
   signals:
 
     /**

src/gui/processing/models/qgsmodelviewtoolpan.cpp

@@ -81,6 +81,7 @@ void QgsModelViewToolPan::modelReleaseEvent( QgsModelViewMouseEvent *event )
 
   mIsPanning = false;
   view()->viewport()->setCursor( Qt::OpenHandCursor );
+  view()->friendlySetSceneRect();
 }
 
 void QgsModelViewToolPan::deactivate()

src/gui/processing/models/qgsmodelviewtooltemporarykeypan.cpp

@@ -37,6 +37,7 @@ void QgsModelViewToolTemporaryKeyPan::keyReleaseEvent( QKeyEvent *event )
   if ( event->key() == Qt::Key_Space && !event->isAutoRepeat() )
   {
     view()->setTool( mPreviousViewTool );
+    view()->friendlySetSceneRect();
   }
 }
 

src/gui/processing/models/qgsmodelviewtooltemporarymousepan.cpp

@@ -37,6 +37,7 @@ void QgsModelViewToolTemporaryMousePan::modelReleaseEvent( QgsModelViewMouseEven
   if ( event->button() == Qt::MiddleButton )
   {
     view()->setTool( mPreviousViewTool );
+    view()->friendlySetSceneRect();
   }
 }
 

tests/src/gui/testprocessinggui.cpp

@@ -11455,6 +11455,42 @@ void TestProcessingGui::testModelGraphicsView()
   // should not exist
   QVERIFY( !layerCommentItem );
 
+  //check model bounds
+  scene2.updateBounds();
+  QRectF modelRect = scene2.sceneRect();
+  QGSCOMPARENEAR( modelRect.height(), 624.4, 3 ); // Sligtly higher threeshold because of various font size can marginally change the bounding rect
+  QGSCOMPARENEAR( modelRect.width(), 655.00, 0.01 );
+  QGSCOMPARENEAR( modelRect.left(), -252.0, 0.01 );
+  QGSCOMPARENEAR( modelRect.top(), -232.0, 0.01 );
+
+
+  // test model large modelRect
+  QgsProcessingModelAlgorithm model2;
+
+  QgsProcessingModelChildAlgorithm algc2;
+  algc2.setChildId( "buffer" );
+  algc2.setAlgorithmId( "native:buffer" );
+  algc2.setPosition( QPointF( 4250, 4250 ) );
+  QgsProcessingModelParameter param1;
+  param1.setParameterName( QStringLiteral( "LAYER" ) );
+  param1.setSize( QSizeF( 500, 400 ) );
+  param1.setPosition( QPointF( -250, -250 ) );
+  model2.addModelParameter( new QgsProcessingParameterMapLayer( QStringLiteral( "LAYER" ) ), param );
+  algc2.addParameterSources( QStringLiteral( "INPUT" ), QList<QgsProcessingModelChildParameterSource>() << QgsProcessingModelChildParameterSource::fromModelParameter( QStringLiteral( "LAYER" ) ) );
+
+  model2.addChildAlgorithm( algc2 );
+
+  QgsModelGraphicsScene scene3;
+  scene3.setModel( &model2 );
+  scene3.createItems( &model2, context );
+
+  scene3.updateBounds();
+  QRectF modelRect2 = scene3.sceneRect();
+  QGSCOMPARENEAR( modelRect2.height(), 4505.4, 3 ); // Sligtly higher threeshold because of various font size can marginally change the bounding rect
+  QGSCOMPARENEAR( modelRect2.width(), 4603.0, 0.01 );
+  QGSCOMPARENEAR( modelRect2.left(), -201.0, 0.01 );
+  QGSCOMPARENEAR( modelRect2.top(), -150.0, 0.01 );
+
 
   QgsModelGraphicsScene scene;
   QVERIFY( !scene.model() );