add application file icon for macos

src/qtviewer/CMakeLists.txt

@@ -41,6 +41,16 @@ set(RESOURCE_FILES
     resources/qt_res.rc
 )
 
+# The MACOSX_BUNDLE_ICON_FILE variable is added to the Info.plist
+# generated by CMake. This variable contains the .icns file name,
+# without the path.
+set(MACOSX_BUNDLE_ICON_FILE ifcosLogo.icns)
+
+# The following tells CMake where to find and install the file itself.
+set(app_icon_macos "resources/ifcosLogo.icns")
+set_source_files_properties(${app_icon_macos} PROPERTIES
+        MACOSX_PACKAGE_LOCATION "Resources")
+
 add_executable(${targetName}
     IfcViewerWidget.h
     IfcViewerWidget.cpp
@@ -50,6 +60,7 @@ add_executable(${targetName}
     MainWindow.cpp
     main.cpp
     ${RESOURCE_FILES}
+    ${app_icon_macos}
 )
 
 set_target_properties(${targetName} PROPERTIES

src/qtviewer/main.cpp

@@ -6,11 +6,14 @@ int main(int argc, char *argv[])
 {
   QApplication app(argc, argv);
 
-  // Set the icon in the window title-bar
+  // Set the icon in the window title-bar on mswindows
+  // and dock icon on macos.
   // "icon" alias defined in .qrc file
-  // (.rc file sets the file icon on mswindows)
   QIcon appIcon(":/icon");
   app.setWindowIcon(appIcon);
+  // File icon set with:
+  // mswindows - .rc file
+  // macos - .icns file (using CMake)
 
   MainWindow window;