+ fixes #0001860: Can not open a FreeCAD project in FreeCAD by double-clicking the project file on Macintosh

src/Gui/GuiApplication.cpp

@@ -30,6 +30,7 @@
 # include <QDataStream>
 # include <QDebug>
 # include <QFileInfo>
+# include <QFileOpenEvent>
 # include <QSessionManager>
 # include <QTimer>
 #endif
@@ -47,6 +48,7 @@
 #endif
 
 #include "GuiApplication.h"
+#include "Application.h"
 #include "SpaceballEvent.h"
 #include "MainWindow.h"
 
@@ -144,6 +146,21 @@ void GUIApplication::commitData(QSessionManager &manager)
     }
 }
 
+bool GUIApplication::event(QEvent * ev)
+{
+    if (ev->type() == QEvent::FileOpen) {
+        QString file = static_cast<QFileOpenEvent*>(ev)->file();
+        QFileInfo fi(file);
+        if (fi.suffix().toLower() == QLatin1String("fcstd")) {
+            QByteArray fn = file.toUtf8();
+            Application::Instance->open(fn, "FreeCAD");
+            return true;
+        }
+    }
+
+    return GUIApplicationNativeEventAware::event(ev);
+}
+
 // ----------------------------------------------------------------------------
 
 class GUISingleApplication::Private {

src/Gui/GuiApplication.h

@@ -49,6 +49,9 @@ public:
     bool notify (QObject * receiver, QEvent * event);
     void commitData(QSessionManager &manager);
 
+protected:
+    bool event(QEvent * event);
+
 private:
     int systemExit;
 };

src/MacAppBundle/FreeCAD.app/Contents/Info.plist

@@ -34,5 +34,18 @@
    	<string>NSApplication</string>	
 	<key>NSHighResolutionCapable</key>
 	<string>True</string>
+	<key>CFBundleDocumentTypes</key>
+	<array>
+		<dict>
+			<key>CFBundleTypeRole</key>
+			<string>Editor</string>
+			<key>CFBundleTypeExtensions</key>
+			<array>
+				<string>fcstd</string>
+			</array>
+			<key>LSIsAppleDefaultForType</key>
+			<true/>
+		</dict>
+	</array>
 </dict>
 </plist>