Move QgsNative instance from app->QgsGui singleton

This allows gui widgets to utilise native platform interfaces.
Additionally attaching the instance to QgsGui allows QgsNative
to become a QObject in future if required and for use
of signals/slots in the native interfaces.

python/gui/qgsgui.sip

@@ -31,6 +31,7 @@ class QgsGui
  :rtype: QgsGui
 %End
 
+
     static QgsEditorWidgetRegistry *editorWidgetRegistry();
 %Docstring
  Returns the global editor widget registry, used for managing all known edit widget factories.

src/app/qgisapp.cpp

@@ -206,6 +206,7 @@ Q_GUI_EXPORT extern int qt_defaultDpiX();
 #include "qgsmimedatautils.h"
 #include "qgsmessagelog.h"
 #include "qgsmultibandcolorrenderer.h"
+#include "qgsnative.h"
 #include "qgsnewvectorlayerdialog.h"
 #include "qgsnewmemorylayerdialog.h"
 #include "qgsoptions.h"
@@ -1200,12 +1201,6 @@ QgisApp::QgisApp( QSplashScreen *splash, bool restorePlugins, bool skipVersionCh
   }
 #endif
 
-#ifdef Q_OS_MAC
-  mNative = new QgsMacNative();
-#else
-  mNative = new QgsNative();
-#endif
-
 } // QgisApp ctor
 
 QgisApp::QgisApp()
@@ -6125,7 +6120,7 @@ void QgisApp::activate()
 
 void QgisApp::bringAllToFront()
 {
-  mNative->currentAppActivateIgnoringOtherApps();
+  QgsGui::nativePlatformInterface()->currentAppActivateIgnoringOtherApps();
 }
 
 void QgisApp::addWindow( QAction *action )

src/app/qgisapp.h

@@ -139,8 +139,6 @@ class QgsDiagramProperties;
 #include "ui_qgisapp.h"
 #include "qgis_app.h"
 
-#include "qgsnative.h"
-
 #include <QGestureEvent>
 #include <QTapAndHoldGesture>
 
@@ -1969,8 +1967,6 @@ class APP_EXPORT QgisApp : public QMainWindow, private Ui::MainWindow
 
     QHash< QgsComposition *, QgsMapLayerAction * > mAtlasFeatureActions;
 
-    QgsNative *mNative = nullptr;
-
     int mProjOpen;
 
     bool gestureEvent( QGestureEvent *event );

src/gui/CMakeLists.txt

@@ -744,6 +744,7 @@ INCLUDE_DIRECTORIES(
   ${CMAKE_CURRENT_SOURCE_DIR}/effects
   ${CMAKE_BINARY_DIR}/src/core
   ${CMAKE_BINARY_DIR}/src/gui
+  ${CMAKE_BINARY_DIR}/src/native
   ../core
   ../core/annotations
   ../core/auth
@@ -758,6 +759,7 @@ INCLUDE_DIRECTORIES(
   ../core/symbology-ng
   ../core/effects
   ../core/metadata
+  ../native
   ${CMAKE_CURRENT_BINARY_DIR}
   ${CMAKE_CURRENT_BINARY_DIR}/../ui
 )
@@ -804,6 +806,7 @@ SET(QGIS_GUI_HDRS ${QGIS_GUI_HDRS} ${CMAKE_CURRENT_BINARY_DIR}/qgis_gui.h)
 IF(NOT APPLE)
   INSTALL(FILES ${QGIS_GUI_HDRS} ${QGIS_GUI_MOC_HDRS} DESTINATION ${QGIS_INCLUDE_DIR})
 ELSE(NOT APPLE)
+  INCLUDE_DIRECTORIES(${CMAKE_SOURCE_DIR}/src/native/mac)
   SET_TARGET_PROPERTIES(qgis_gui PROPERTIES
     CLEAN_DIRECT_OUTPUT 1
     FRAMEWORK 1
@@ -838,6 +841,7 @@ ADD_DEPENDENCIES(qgis_gui ui)
 
 TARGET_LINK_LIBRARIES(qgis_gui
   qgis_core
+  qgis_native
   ${QT_QTUITOOLS_LIBRARY}
   ${QWT_LIBRARY}
   ${QSCINTILLA_LIBRARY}

src/gui/qgsgui.cpp

@@ -19,6 +19,7 @@
 #include "qgseditorwidgetregistry.h"
 #include "qgslayertreeembeddedwidgetregistry.h"
 #include "qgsmaplayeractionregistry.h"
+#include "qgsnative.h"
 #include "qgsshortcutsmanager.h"
 
 QgsGui *QgsGui::instance()
@@ -27,6 +28,11 @@ QgsGui *QgsGui::instance()
   return sInstance;
 }
 
+QgsNative *QgsGui::nativePlatformInterface()
+{
+  return instance()->mNative;
+}
+
 QgsEditorWidgetRegistry *QgsGui::editorWidgetRegistry()
 {
   return instance()->mEditorWidgetRegistry;
@@ -53,10 +59,17 @@ QgsGui::~QgsGui()
   delete mEditorWidgetRegistry;
   delete mMapLayerActionRegistry;
   delete mShortcutsManager;
+  delete mNative;
 }
 
 QgsGui::QgsGui()
 {
+#ifdef Q_OS_MAC
+  mNative = new QgsMacNative();
+#else
+  mNative = new QgsNative();
+#endif
+
   mEditorWidgetRegistry = new QgsEditorWidgetRegistry();
   mShortcutsManager = new QgsShortcutsManager();
   mLayerTreeEmbeddedWidgetRegistry = new QgsLayerTreeEmbeddedWidgetRegistry();

src/gui/qgsgui.h

@@ -19,11 +19,13 @@
 #define QGSGUI_H
 
 #include "qgis_gui.h"
+#include "qgis_sip.h"
 
 class QgsEditorWidgetRegistry;
 class QgsShortcutsManager;
 class QgsLayerTreeEmbeddedWidgetRegistry;
 class QgsMapLayerActionRegistry;
+class QgsNative;
 
 /**
  * \ingroup gui
@@ -46,6 +48,13 @@ class GUI_EXPORT QgsGui
      */
     static QgsGui *instance();
 
+    /**
+     * Returns the global native interface, which offers abstraction to the host OS's underlying public
+     * interfaces.
+     * \note Not available in Python bindings
+     */
+    SIP_SKIP static QgsNative *nativePlatformInterface();
+
     /**
      * Returns the global editor widget registry, used for managing all known edit widget factories.
      */
@@ -72,6 +81,7 @@ class GUI_EXPORT QgsGui
 
     QgsGui();
 
+    QgsNative *mNative = nullptr;
     QgsEditorWidgetRegistry *mEditorWidgetRegistry = nullptr;
     QgsShortcutsManager *mShortcutsManager = nullptr;
     QgsLayerTreeEmbeddedWidgetRegistry *mLayerTreeEmbeddedWidgetRegistry = nullptr;

src/native/qgsnative.cpp

@@ -17,10 +17,6 @@
 
 #include "qgsnative.h"
 
-QgsNative::QgsNative()
-{
-}
-
 void QgsNative::currentAppActivateIgnoringOtherApps()
 {
 }

src/native/qgsnative.h

@@ -21,18 +21,20 @@
 #include "qgis_native.h"
 
 /**
+ * \class QgsNative
+ * \ingroup native
  * Base class for implementing methods for native system calls that
  * are implemented in subclasses to provide platform abstraction.
+ * \since QGIS 3.0
  */
 class NATIVE_EXPORT QgsNative
 {
   public:
-    QgsNative();
+
+    virtual ~QgsNative() = default;
 
     /**
-     * Bring QGIS to front. Default implementation does nothing.
-     *
-     * @note Added in QGIS 3.0
+     * Brings the QGIS app to front. The default implementation does nothing.
      */
     virtual void currentAppActivateIgnoringOtherApps();
 };

tests/src/app/CMakeLists.txt

@@ -22,8 +22,6 @@ INCLUDE_DIRECTORIES(${CMAKE_CURRENT_SOURCE_DIR}
   ${CMAKE_CURRENT_SOURCE_DIR}/../../../src/app
   ${CMAKE_CURRENT_SOURCE_DIR}/../../../src/app/pluginmanager
   ${CMAKE_CURRENT_SOURCE_DIR}/../../../src/test
-  ${CMAKE_SOURCE_DIR}/src/native
-  ${CMAKE_BINARY_DIR}/src/native
   ${CMAKE_BINARY_DIR}/src/core
   ${CMAKE_BINARY_DIR}/src/gui
   ${CMAKE_BINARY_DIR}/src/python
@@ -79,8 +77,6 @@ MACRO (ADD_QGIS_TEST testname testsrc)
     TARGET_LINK_LIBRARIES(qgis_${testname} ${APP_SERVICES_LIBRARY} )
   ENDIF(APPLE)
   ADD_TEST(qgis_${testname} ${CMAKE_CURRENT_BINARY_DIR}/../../../output/bin/qgis_${testname} -maxwarnings 10000)
-  TARGET_LINK_LIBRARIES(qgis_${testname} qgis_native)
-  ADD_TEST(qgis_${testname} ${CMAKE_CURRENT_BINARY_DIR}/../../../output/bin/qgis_${testname})
   #SET_TARGET_PROPERTIES(qgis_${testname} PROPERTIES
   #  INSTALL_RPATH ${CMAKE_INSTALL_PREFIX}/${QGIS_LIB_DIR}
   #  INSTALL_RPATH_USE_LINK_PATH true )

tests/src/gui/CMakeLists.txt

@@ -21,6 +21,8 @@ INCLUDE_DIRECTORIES(${CMAKE_CURRENT_SOURCE_DIR}
   ${CMAKE_CURRENT_SOURCE_DIR}/../../../src/core/raster
   ${CMAKE_CURRENT_SOURCE_DIR}/../../../src/core/symbology-ng
   ${CMAKE_CURRENT_SOURCE_DIR}/../../../src/test
+  ${CMAKE_SOURCE_DIR}/src/native
+  ${CMAKE_BINARY_DIR}/src/native
   ${CMAKE_BINARY_DIR}/src/core
   ${CMAKE_BINARY_DIR}/src/gui
 )
@@ -87,6 +89,8 @@ MACRO (ADD_QGIS_TEST testname testsrc)
     qgis_core
     qgis_gui)
   ADD_TEST(qgis_${testname} ${CMAKE_CURRENT_BINARY_DIR}/../../../output/bin/qgis_${testname} -maxwarnings 10000)
+  TARGET_LINK_LIBRARIES(qgis_${testname} qgis_native)
+  ADD_TEST(qgis_${testname} ${CMAKE_CURRENT_BINARY_DIR}/../../../output/bin/qgis_${testname})
   #SET_TARGET_PROPERTIES(qgis_${testname} PROPERTIES
   #  INSTALL_RPATH ${CMAKE_INSTALL_PREFIX}/${QGIS_LIB_DIR}
   #  INSTALL_RPATH_USE_LINK_PATH true )

tests/src/native/CMakeLists.txt

@@ -65,7 +65,7 @@ MACRO (ADD_QGIS_TEST testname testsrc)
   TARGET_LINK_LIBRARIES(qgis_${testname}
     ${QT_QTCORE_LIBRARY}
     ${QT_QTTEST_LIBRARY}
-    qgis_app
+    qgis_gui
     qgis_native
   )
   ADD_TEST(qgis_${testname} ${CMAKE_CURRENT_BINARY_DIR}/../../../output/bin/qgis_${testname} -maxwarnings 10000)