Add About window

Gtkmm3_Mac/res/menubar.xml

@@ -4,6 +4,7 @@
         <section>
             <item>
                 <attribute name="label">About My GtkUI Mac version</attribute>
+                <attribute name="action">win.about</attribute>
             </item>
             <item>
                 <attribute name="label">Software Update...</attribute>

Gtkmm3_Mac/src/core/MyWin.cc

@@ -18,6 +18,7 @@ MyWin::MyWin()
     // Add Action for menus
     add_action("logout", sigc::mem_fun(*this, &MyWin::logout_activated));
     add_action("quit", sigc::mem_fun(*this, &MyWin::quit_activated));
+    add_action("about",sigc::mem_fun(*this,&MyWin::about_activated));
 
     // Add Stack
     m_overlay.add_overlay(*(main_stack.stack));
@@ -38,16 +39,61 @@ MyWin::MyWin()
     show_all_children();
 }
 
-void MyWin::press(int n_press,double x,double y){
+void MyWin::press(int n_press, double x, double y)
+{
     // Show Menu
     context_menu.set_pointing_to(Gdk::Rectangle((int)x, (int)y, 1, 1));
     context_menu.popup();
 }
 
-void MyWin::logout_activated(){
+void MyWin::logout_activated()
+{
     main_stack.logout();
 }
 
-void MyWin::quit_activated(){
+void MyWin::about_activated()
+{
+    // Authors information
+    const char *authors[] = {
+        "Dale Clack",
+        "GCR_CMake on github https://github.com/Makman2/GCR_CMake",
+        NULL};
+
+    //Version information
+    char *version;
+    version = g_strdup_printf("5.0\nRunning Against: Gtkmm %d.%d.%d",
+                              GTKMM_MAJOR_VERSION,
+                              GTKMM_MINOR_VERSION,
+                              GTKMM_MICRO_VERSION);
+
+    // Get Year information
+    time_t t;
+    t=time(NULL);
+    struct tm * local;
+    local = localtime(&t);
+
+    //Copyright
+    char * copyright;
+    copyright = g_strdup_printf("© 2019—%04d The Xe Project",local->tm_year+1900);
+
+    //Show the about dialog
+    gtk_show_about_dialog(GTK_WINDOW(gobj()),
+                          "program-name", "My_GtkUI",
+                          "version", version,
+                          "copyright", copyright,
+                          "comments", "A program that simulates desktop (Mac Version)",
+                          "authors", authors,
+                          "license-type", GTK_LICENSE_GPL_3_0,
+                          "logo-icon-name", "My_GtkUI",
+                          "title", "About My GtkUI Mac Version",
+                          NULL);
+    
+    //Free Memory
+    g_free(version);
+    g_free(copyright);
+}
+
+void MyWin::quit_activated()
+{
     hide();
 }

Gtkmm3_Mac/src/core/MyWin.hh

@@ -23,5 +23,6 @@ private:
     //Signal Handlers
     void logout_activated();
     void quit_activated();
+    void about_activated();
 
 };