Allow showing CRS in QgsMapLayerComboBox

python/core/qgsmaplayermodel.sip

@@ -54,6 +54,20 @@ class QgsMapLayerModel : QAbstractItemModel
      */
     bool allowEmptyLayer() const;
 
+    /**
+     * Sets whether the CRS of layers is also included in the model's display role.
+     * @see showCrs()
+     * @note added in QGIS 3.0
+     */
+    void setShowCrs( bool showCrs );
+
+    /**
+     * Returns true if the model includes layer's CRS in the display role.
+     * @see setShowCrs()
+     * @note added in QGIS 3.0
+     */
+    bool showCrs() const;
+
     /**
      * @brief layersChecked returns the list of layers which are checked (or unchecked)
      */
@@ -75,15 +89,15 @@ class QgsMapLayerModel : QAbstractItemModel
   public:
     QModelIndex index( int row, int column, const QModelIndex &parent = QModelIndex() ) const;
     QModelIndex parent( const QModelIndex &child ) const;
-    int rowCount( const QModelIndex &parent ) const;
+    int rowCount( const QModelIndex &parent = QModelIndex() ) const;
-    int columnCount( const QModelIndex &parent ) const;
+    int columnCount( const QModelIndex &parent = QModelIndex() ) const;
-    QVariant data( const QModelIndex &index, int role ) const;
+    QVariant data( const QModelIndex &index, int role = Qt::DisplayRole ) const;
 
     /**
      * Returns strings for all roles supported by this model.
      */
     QHash<int, QByteArray> roleNames() const;
 
-    bool setData( const QModelIndex &index, const QVariant &value, int role );
+    bool setData( const QModelIndex &index, const QVariant &value, int role = Qt::DisplayRole );
     Qt::ItemFlags flags( const QModelIndex &index ) const;
 };

python/gui/qgsmaplayercombobox.sip

@@ -42,6 +42,20 @@ class QgsMapLayerComboBox : QComboBox
      */
     bool allowEmptyLayer() const;
 
+    /**
+     * Sets whether the CRS of layers is also included in the combo box text.
+     * @see showCrs()
+     * @note added in QGIS 3.0
+     */
+    void setShowCrs( bool showCrs );
+
+    /**
+     * Returns true if the combo box shows the layer's CRS.
+     * @see setShowCrs()
+     * @note added in QGIS 3.0
+     */
+    bool showCrs() const;
+
     /** Returns the current layer selected in the combo box.
      * @see layer
      */

src/core/qgsmaplayermodel.cpp

@@ -27,6 +27,7 @@ QgsMapLayerModel::QgsMapLayerModel( const QList<QgsMapLayer *>& layers, QObject
     , mLayersChecked( QMap<QString, Qt::CheckState>() )
     , mItemCheckable( false )
     , mAllowEmpty( false )
+    , mShowCrs( false )
 {
   connect( QgsMapLayerRegistry::instance(), SIGNAL( layersWillBeRemoved( QStringList ) ), this, SLOT( removeLayers( QStringList ) ) );
   addLayers( layers );
@@ -37,6 +38,7 @@ QgsMapLayerModel::QgsMapLayerModel( QObject *parent )
     , mLayersChecked( QMap<QString, Qt::CheckState>() )
     , mItemCheckable( false )
     , mAllowEmpty( false )
+    , mShowCrs( false )
 {
   connect( QgsMapLayerRegistry::instance(), SIGNAL( layersAdded( QList<QgsMapLayer*> ) ), this, SLOT( addLayers( QList<QgsMapLayer*> ) ) );
   connect( QgsMapLayerRegistry::instance(), SIGNAL( layersWillBeRemoved( QStringList ) ), this, SLOT( removeLayers( QStringList ) ) );
@@ -54,7 +56,7 @@ void QgsMapLayerModel::checkAll( Qt::CheckState checkState )
   {
     mLayersChecked[key] = checkState;
   }
-  emit dataChanged( index( 0, 0 ), index( mLayers.length() - 1, 0 ) );
+  emit dataChanged( index( 0, 0 ), index( rowCount() - 1, 0 ) );
 }
 
 void QgsMapLayerModel::setAllowEmptyLayer( bool allowEmpty )
@@ -76,6 +78,15 @@ void QgsMapLayerModel::setAllowEmptyLayer( bool allowEmpty )
   }
 }
 
+void QgsMapLayerModel::setShowCrs( bool showCrs )
+{
+  if ( mShowCrs == showCrs )
+    return;
+
+  mShowCrs = showCrs;
+  emit dataChanged( index( 0, 0 ), index( rowCount() - 1, 0 ), QVector<int>() << Qt::DisplayRole );
+}
+
 QList<QgsMapLayer *> QgsMapLayerModel::layersChecked( Qt::CheckState checkState )
 {
   QList<QgsMapLayer *> layers;
@@ -183,7 +194,17 @@ QVariant QgsMapLayerModel::data( const QModelIndex &index, int role ) const
       return QVariant();
 
     QgsMapLayer* layer = static_cast<QgsMapLayer*>( index.internalPointer() );
-    return layer ? layer->name() : QVariant();
+    if ( !layer )
+      return QVariant();
+
+    if ( !mShowCrs )
+    {
+      return layer->name();
+    }
+    else
+    {
+      return tr( "%1 [%2]" ).arg( layer->name(), layer->crs().authid() );
+    }
   }
 
   if ( role == LayerIdRole )

src/core/qgsmaplayermodel.h

@@ -32,6 +32,11 @@ class QgsMapLayer;
 class CORE_EXPORT QgsMapLayerModel : public QAbstractItemModel
 {
     Q_OBJECT
+
+    Q_PROPERTY( bool allowEmptyLayer READ allowEmptyLayer WRITE setAllowEmptyLayer )
+    Q_PROPERTY( bool showCrs READ showCrs WRITE setShowCrs )
+    Q_PROPERTY( bool itemsCheckable READ itemsCheckable WRITE setItemsCheckable )
+
   public:
 
     //! Item data roles
@@ -76,6 +81,20 @@ class CORE_EXPORT QgsMapLayerModel : public QAbstractItemModel
      */
     bool allowEmptyLayer() const { return mAllowEmpty; }
 
+    /**
+     * Sets whether the CRS of layers is also included in the model's display role.
+     * @see showCrs()
+     * @note added in QGIS 3.0
+     */
+    void setShowCrs( bool showCrs );
+
+    /**
+     * Returns true if the model includes layer's CRS in the display role.
+     * @see setShowCrs()
+     * @note added in QGIS 3.0
+     */
+    bool showCrs() const { return mShowCrs; }
+
     /**
      * @brief layersChecked returns the list of layers which are checked (or unchecked)
      */
@@ -101,9 +120,9 @@ class CORE_EXPORT QgsMapLayerModel : public QAbstractItemModel
   public:
     QModelIndex index( int row, int column, const QModelIndex &parent = QModelIndex() ) const override;
     QModelIndex parent( const QModelIndex &child ) const override;
-    int rowCount( const QModelIndex &parent ) const override;
+    int rowCount( const QModelIndex &parent = QModelIndex() ) const override;
-    int columnCount( const QModelIndex &parent ) const override;
+    int columnCount( const QModelIndex &parent = QModelIndex() ) const override;
-    QVariant data( const QModelIndex &index, int role ) const override;
+    QVariant data( const QModelIndex &index, int role = Qt::DisplayRole ) const override;
 
     /**
      * Returns strings for all roles supported by this model.
@@ -112,12 +131,13 @@ class CORE_EXPORT QgsMapLayerModel : public QAbstractItemModel
      */
     QHash<int, QByteArray> roleNames() const override;
 
-    bool setData( const QModelIndex &index, const QVariant &value, int role ) override;
+    bool setData( const QModelIndex &index, const QVariant &value, int role = Qt::EditRole ) override;
     Qt::ItemFlags flags( const QModelIndex &index ) const override;
 
   private:
 
     bool mAllowEmpty;
+    bool mShowCrs;
 };
 
 #endif // QGSMAPLAYERMODEL_H

src/gui/qgsmaplayercombobox.cpp

@@ -38,6 +38,16 @@ bool QgsMapLayerComboBox::allowEmptyLayer() const
   return mProxyModel->sourceLayerModel()->allowEmptyLayer();
 }
 
+void QgsMapLayerComboBox::setShowCrs( bool showCrs )
+{
+  mProxyModel->sourceLayerModel()->setShowCrs( showCrs );
+}
+
+bool QgsMapLayerComboBox::showCrs() const
+{
+  return mProxyModel->sourceLayerModel()->showCrs();
+}
+
 void QgsMapLayerComboBox::setLayer( QgsMapLayer *layer )
 {
   if ( !layer )

src/gui/qgsmaplayercombobox.h

@@ -32,6 +32,8 @@ class GUI_EXPORT QgsMapLayerComboBox : public QComboBox
     Q_OBJECT
     Q_FLAGS( QgsMapLayerProxyModel::Filters )
     Q_PROPERTY( QgsMapLayerProxyModel::Filters filters READ filters WRITE setFilters )
+    Q_PROPERTY( bool allowEmptyLayer READ allowEmptyLayer WRITE setAllowEmptyLayer )
+    Q_PROPERTY( bool showCrs READ showCrs WRITE setShowCrs )
 
   public:
 
@@ -67,6 +69,20 @@ class GUI_EXPORT QgsMapLayerComboBox : public QComboBox
      */
     bool allowEmptyLayer() const;
 
+    /**
+     * Sets whether the CRS of layers is also included in the combo box text.
+     * @see showCrs()
+     * @note added in QGIS 3.0
+     */
+    void setShowCrs( bool showCrs );
+
+    /**
+     * Returns true if the combo box shows the layer's CRS.
+     * @see setShowCrs()
+     * @note added in QGIS 3.0
+     */
+    bool showCrs() const;
+
     /** Returns the current layer selected in the combo box.
      * @see layer
      */

tests/src/python/test_qgsmaplayermodel.py

@@ -23,7 +23,7 @@ start_app()
 
 
 def create_layer(name):
-    layer = QgsVectorLayer("Point?field=fldtxt:string&field=fldint:integer",
+    layer = QgsVectorLayer("Point?crs=EPSG:3111&field=fldtxt:string&field=fldint:integer",
                            name, "memory")
     return layer
 
@@ -44,6 +44,11 @@ class TestQgsMapLayerModel(unittest.TestCase):
         m.setAllowEmptyLayer(False)
         self.assertFalse(m.allowEmptyLayer())
 
+        m.setShowCrs(True)
+        self.assertTrue(m.showCrs())
+        m.setShowCrs(False)
+        self.assertFalse(m.showCrs())
+
     def testAddingRemovingLayers(self):
         # test model handles layer addition and removal
         m = QgsMapLayerModel()
@@ -146,6 +151,21 @@ class TestQgsMapLayerModel(unittest.TestCase):
 
         QgsMapLayerRegistry.instance().removeMapLayers([l1.id(), l2.id()])
 
+    def testDisplayRoleShowCrs(self):
+        l1 = create_layer('l1')
+        l2 = create_layer('l2')
+        QgsMapLayerRegistry.instance().addMapLayers([l1, l2])
+        m = QgsMapLayerModel()
+        m.setShowCrs(True)
+        self.assertEqual(m.data(m.index(0, 0), Qt.DisplayRole), 'l1 [EPSG:3111]')
+        self.assertEqual(m.data(m.index(1, 0), Qt.DisplayRole), 'l2 [EPSG:3111]')
+        m.setAllowEmptyLayer(True)
+        self.assertFalse(m.data(m.index(0, 0), Qt.DisplayRole))
+        self.assertEqual(m.data(m.index(1, 0), Qt.DisplayRole), 'l1 [EPSG:3111]')
+        self.assertEqual(m.data(m.index(2, 0), Qt.DisplayRole), 'l2 [EPSG:3111]')
+
+        QgsMapLayerRegistry.instance().removeMapLayers([l1.id(), l2.id()])
+
     def testLayerIdRole(self):
         l1 = create_layer('l1')
         l2 = create_layer('l2')