New member function Fl_Menu_Bar::play_menu(const char *title)

CHANGES.txt

@@ -105,6 +105,8 @@ Changes in FLTK 1.4.0                            Released: Feb ?? 2024
     hardware support is present (a backup mechanism is available in absence
     of this support). Thus, all text drawable in Fl_Window's can be drawn
     in Fl_Gl_Window's (STR#3450).
+  - New member function Fl_Menu_Bar::play_menu(const char *title) to
+    programmatically open a menu of a menubar.
   - New member functions Fl::program_should_quit(void),
     and Fl::program_should_quit(int) to support detection by the library
     of a request to terminate cleanly the program.

FL/Fl_Menu_Bar.H

@@ -61,18 +61,7 @@
 
   Typing the shortcut() of any of the menu items will cause
   callbacks exactly the same as when you pick the item with the mouse.
- 
+ */
-  This code can be used to programmatically open a menu ("Edit" in the example) of a menubar :
-  \code
-  Fl_Menu_Bar *bar = ……;
-  const Fl_Menu_Item *v = bar->find_item("Edit");
-  if (v) {
-    v = bar->menu()->pulldown(bar->x(), bar->y(), bar->w(), bar->h(), v, bar, 0, 1);
-    bar->picked(v);
-  }
- \endcode
-  This code currently should be avoided with an Fl_Sys_Menu_Bar object on the macOS platform.
-*/
 class FL_EXPORT Fl_Menu_Bar : public Fl_Menu_ {
   friend class Fl_Sys_Menu_Bar_Driver;
 protected:
@@ -102,6 +91,10 @@ public:
    This is useful when the menu bar can be an Fl_Sys_Menu_Bar object.
    */
   virtual void update() {}
+  /**
+   Opens the menu named \c title of the menubar.
+   */
+  virtual void play_menu(const char *title);
 };
 
 #endif

FL/Fl_Sys_Menu_Bar.H

@@ -111,6 +111,7 @@ public:
   const Fl_Menu_Item *menu() const {return Fl_Menu_::menu();}
   void menu(const Fl_Menu_Item *m);
   void update() FL_OVERRIDE;
+  void play_menu(const char *title) FL_OVERRIDE;
   int add(const char* label, int shortcut, Fl_Callback*, void *user_data=0, int flags=0);
   /** Adds a new menu item.
    \see Fl_Menu_::add(const char* label, int shortcut, Fl_Callback*, void *user_data=0, int flags=0)

src/Fl_MacOS_Sys_Menu_Bar.mm

@@ -726,4 +726,36 @@ void fl_mac_set_about(Fl_Callback *cb, void *user_data, int shortcut) {
   Fl_Sys_Menu_Bar::about(cb, user_data);
 }
 
+
+void Fl_MacOS_Sys_Menu_Bar_Driver::play_menu(const char *menu_name) {
+  // Use the accessibility interface to programmatically open a menu of the system menubar
+  char *ts = remove_ampersand(menu_name);
+  NSString *mac_name = [NSString stringWithUTF8String:ts];
+  free(ts);
+  AXUIElementRef appElement = AXUIElementCreateApplication(getpid());
+  AXUIElementRef menuBar;
+  AXError error = AXUIElementCopyAttributeValue(appElement, kAXMenuBarAttribute, (CFTypeRef *)&menuBar);
+  if (error) return;
+  CFIndex count = -1;
+  error = AXUIElementGetAttributeValueCount(menuBar, kAXChildrenAttribute, &count);
+  if (error) { CFRelease(menuBar); return; }
+  NSArray *children = nil;
+  error = AXUIElementCopyAttributeValues(menuBar, kAXChildrenAttribute, 0, count, (CFArrayRef *)&children);
+  if (error) { CFRelease(menuBar); return; }
+  for (id child in children) {
+    AXUIElementRef element = (AXUIElementRef)child;
+    id title;
+    AXError error = AXUIElementCopyAttributeValue(element, kAXTitleAttribute, (CFTypeRef *)&title);
+    if (!error && [title isEqualToString:mac_name]) {
+      AXUIElementPerformAction(element, kAXPressAction);
+      CFRelease(title);
+      break;
+    }
+    CFRelease(title);
+  }
+  CFRelease(menuBar);
+  [children release];
+  CFRelease(appElement);
+}
+
 #endif /* __APPLE__ */

src/Fl_Menu_Bar.cxx

@@ -67,3 +67,12 @@ Fl_Menu_Bar::Fl_Menu_Bar(int X, int Y, int W, int H,const char *l)
 : Fl_Menu_(X,Y,W,H,l)
 {
 }
+
+
+void Fl_Menu_Bar::play_menu(const char *title) {
+  const Fl_Menu_Item *v = find_item(title);
+  if (v) {
+    v = menu()->pulldown(x(), y(), w(), h(), v, this, 0, 1);
+    picked(v);
+  }
+}

src/Fl_Sys_Menu_Bar.cxx

@@ -242,6 +242,11 @@ void Fl_Sys_Menu_Bar::create_window_menu() {
   }
 }
 
+void Fl_Sys_Menu_Bar::play_menu(const char *title) {
+  if (driver()) fl_sys_menu_bar->driver()->play_menu(title);
+  else Fl_Menu_Bar::play_menu(title);
+}
+
 #if !defined(FL_DOXYGEN)
 Fl_Sys_Menu_Bar_Driver *Fl_Sys_Menu_Bar::driver() {
   return Fl::system_driver()->sys_menu_bar_driver();

src/Fl_Sys_Menu_Bar_Driver.H

@@ -48,6 +48,7 @@ public:
   virtual void replace(int index, const char *name) { bar->Fl_Menu_Bar::replace(index, name); }
   virtual void mode(int i, int fl) { bar->Fl_Menu_Bar::mode(i, fl); }
   virtual void create_window_menu() {}
+  virtual void play_menu(const char *title) {}
   static Fl_Sys_Menu_Bar::window_menu_style_enum window_menu_style() { return window_menu_style_; }
   static void window_menu_style(Fl_Sys_Menu_Bar::window_menu_style_enum style) { window_menu_style_ = style; }
 };

src/drivers/Cocoa/Fl_MacOS_Sys_Menu_Bar_Driver.H

@@ -44,6 +44,7 @@ public:
   void remove_window(Fl_Window *win);
   void rename_window(Fl_Window *win);
   static Fl_MacOS_Sys_Menu_Bar_Driver* driver();
+  void play_menu(const char *menu_name) FL_OVERRIDE;
 };