fix #20316 not possible to assign mesh crs

src/app/mesh/qgsmeshlayerproperties.cpp

@@ -111,6 +111,7 @@ void QgsMeshLayerProperties::syncToLayer()
    */
   mLayerOrigNameLineEd->setText( mMeshLayer->name() );
   leDisplayName->setText( mMeshLayer->name() );
+  whileBlocking( mCrsSelector )->setCrs( mMeshLayer->crs() );
 
   if ( mMeshLayer && mMeshLayer->dataProvider() )
   {
@@ -186,6 +187,7 @@ void QgsMeshLayerProperties::apply()
 
 void QgsMeshLayerProperties::changeCrs( const QgsCoordinateReferenceSystem &crs )
 {
+  QgisApp::instance()->askUserForDatumTransform( crs, QgsProject::instance()->crs() );
   mMeshLayer->setCrs( crs );
 }
 

src/app/mesh/qgsmeshlayerproperties.h

@@ -65,6 +65,8 @@ class APP_EXPORT QgsMeshLayerProperties : public QgsOptionsDialogBase, private U
 
     //! \brief Pointer to the mesh layer that this property dilog changes the behavior of.
     QgsMeshLayer *mMeshLayer = nullptr;
+
+    friend class TestQgsMeshLayerPropertiesDialog;
 };
 
 

tests/src/app/CMakeLists.txt

@@ -121,3 +121,4 @@ ADD_QGIS_TEST(maptooltrimextendfeaturetest testqgsmaptooltrimextendfeature.cpp)
 ADD_QGIS_TEST(projectproperties testqgsprojectproperties.cpp)
 ADD_QGIS_TEST(layoutvaliditychecks testqgsapplayoutvaliditychecks.cpp)
 ADD_QGIS_TEST(meshcalculator testqgsmeshcalculatordialog.cpp)
+ADD_QGIS_TEST(meshlayerpropertiesdialog testqgsmeshlayerpropertiesdialog.cpp)

tests/src/app/testqgsmeshlayerpropertiesdialog.cpp

@@ -0,0 +1,87 @@
+/***************************************************************************
+     testqgsmeshlayerpropertiesdialog.cpp
+     ------------------------------------
+    Date                 : January 2019
+    Copyright            : (C) 2019 by Peter Petrik
+    Email                : zilolv at gmail dot com
+ ***************************************************************************
+ *                                                                         *
+ *   This program is free software; you can redistribute it and/or modify  *
+ *   it under the terms of the GNU General Public License as published by  *
+ *   the Free Software Foundation; either version 2 of the License, or     *
+ *   (at your option) any later version.                                   *
+ *                                                                         *
+ ***************************************************************************/
+#include "qgstest.h"
+#include "qgisapp.h"
+#include "qgsapplication.h"
+#include "qgsmeshlayer.h"
+#include "qgsmeshdataprovider.h"
+#include "qgsmeshlayerproperties.h"
+#include "qgsfeedback.h"
+#include "qgis.h"
+#include "qgsmapcanvas.h"
+
+#include <QTemporaryFile>
+
+/**
+ * \ingroup UnitTests
+ * This is a unit test for the mesh layer properties dialog
+ */
+class TestQgsMeshLayerPropertiesDialog : public QObject
+{
+    Q_OBJECT
+  public:
+    TestQgsMeshLayerPropertiesDialog();
+
+  private slots:
+    void initTestCase();// will be called before the first testfunction is executed.
+    void cleanupTestCase();// will be called after the last testfunction was executed.
+    void init() {} // will be called before each testfunction is executed.
+    void cleanup() {} // will be called after every testfunction.
+
+    void testCrs();
+
+  private:
+    QgisApp *mQgisApp = nullptr;
+    QgsMeshLayer *mpMeshLayer = nullptr;
+};
+
+TestQgsMeshLayerPropertiesDialog::TestQgsMeshLayerPropertiesDialog() = default;
+
+//runs before all tests
+void TestQgsMeshLayerPropertiesDialog::initTestCase()
+{
+  qDebug() << "TestQgisAppClipboard::initTestCase()";
+  // init QGIS's paths - true means that all path will be inited from prefix
+  QgsApplication::init();
+  QgsApplication::initQgis();
+  mQgisApp = new QgisApp();
+
+  QString testDataDir = QStringLiteral( TEST_DATA_DIR ) + QStringLiteral( "/mesh/" );
+  QString uri( testDataDir + "/quad_and_triangle.2dm" );
+  mpMeshLayer = new QgsMeshLayer( uri, "Triangle and Quad MDAL", "mdal" );
+
+  QgsProject::instance()->addMapLayers(
+    QList<QgsMapLayer *>() << mpMeshLayer );
+}
+
+//runs after all tests
+void TestQgsMeshLayerPropertiesDialog::cleanupTestCase()
+{
+  QgsApplication::exitQgis();
+}
+
+void TestQgsMeshLayerPropertiesDialog::testCrs()
+{
+  std::unique_ptr< QgsMeshLayerProperties > dialog = qgis::make_unique< QgsMeshLayerProperties> ( mpMeshLayer,
+      mQgisApp->mapCanvas()
+                                                                                                );
+  QCOMPARE( dialog->mCrsSelector->crs(), mpMeshLayer->crs() );
+  QgsCoordinateReferenceSystem crs = QgsCoordinateReferenceSystem::fromEpsgId( 27700 );
+  dialog->mCrsSelector->setCrs( crs );
+  QCOMPARE( crs, mpMeshLayer->crs() );
+}
+
+QGSTEST_MAIN( TestQgsMeshLayerPropertiesDialog )
+#include "testqgsmeshlayerpropertiesdialog.moc"