[gimp] tests: implement gimp_test_utils_synthesize_key_event on OSX/QUARTZ

[Alex Samorukov <asamorukov src gnome org>]

commit 7921b24a89630c00558d6812cd897549e594b93c
Author: Oleksii Samorukov <samm os2 kiev ua>
Date:   Fri Nov 23 23:06:12 2018 +0100

    tests: implement gimp_test_utils_synthesize_key_event on OSX/QUARTZ
    
    (cherry picked from commit 9ae19eb8ec04adc28cdbe4045068a4f446ffa708)

 app/tests/Makefile.am           |  7 ++++
 app/tests/gimp-app-test-utils.c | 77 ++++++++++++++++++++++++++++++++++++++++-
 2 files changed, 83 insertions(+), 1 deletion(-)
---
diff --git a/app/tests/Makefile.am b/app/tests/Makefile.am
index 81e1f5608d..f0d16c608a 100644
--- a/app/tests/Makefile.am
+++ b/app/tests/Makefile.am
@@ -2,6 +2,12 @@
 # The tests must not be run in parallel or in a different order as specified
 .NOTPARALLEL: check
 
+if PLATFORM_OSX
+xobjective_c = "-xobjective-c"
+xobjective_cxx = "-xobjective-c++"
+xnone = "-xnone"
+endif
+
 SUBDIRS = \
        files           \
        gimpdir         \
@@ -69,6 +75,7 @@ AM_CPPFLAGS = \
        $(GTK_CFLAGS)           \
        $(DBUS_GLIB_CFLAGS)     \
        $(GEGL_CFLAGS)          \
+       $(xobjective_c)         \
        -I$(includedir)
 
 # We need this due to circular dependencies
diff --git a/app/tests/gimp-app-test-utils.c b/app/tests/gimp-app-test-utils.c
index 8182728804..6ea13f3718 100644
--- a/app/tests/gimp-app-test-utils.c
+++ b/app/tests/gimp-app-test-utils.c
@@ -49,6 +49,12 @@
 #include <windows.h>
 #endif /* G_OS_WIN32 */
 
+#ifdef GDK_WINDOWING_QUARTZ
+// only to get keycode definitions from HIToolbox/Events.h
+#include <Carbon/Carbon.h>
+#include <Cocoa/Cocoa.h>
+#endif /* GDK_WINDOWING_QUARTZ */
+
 void
 gimp_test_utils_set_env_to_subdir (const gchar *root_env_var,
                                    const gchar *subdir,
@@ -279,7 +285,76 @@ gimp_test_utils_synthesize_key_event (GtkWidget *widget,
     {
       g_warning ("%s: no win32 key mapping found for keyval %d.", G_STRFUNC, keyval);
     }
-#else /* G_OS_WIN32  && ! GTK_CHECK_VERSION (2, 24, 25) */
+#elif defined(GDK_WINDOWING_QUARTZ)
+
+GdkKeymapKey *keys   = NULL;
+gint          n_keys = 0;
+gint          i;
+CGEventRef    keyUp, keyDown;
+
+if (gdk_keymap_get_entries_for_keyval (gdk_keymap_get_for_display (gdk_display_get_default ()), keyval, 
&keys, &n_keys))
+  {
+    /* XXX not in use yet */
+    CGEventRef commandDown     =       CGEventCreateKeyboardEvent (NULL, (CGKeyCode)kVK_Command, true);
+    CGEventRef commandUp       =       CGEventCreateKeyboardEvent (NULL, (CGKeyCode)kVK_Command, false);
+
+    CGEventRef shiftDown       =       CGEventCreateKeyboardEvent (NULL, (CGKeyCode)kVK_Shift, true);
+    CGEventRef shiftUp         =       CGEventCreateKeyboardEvent (NULL, (CGKeyCode)kVK_Shift, false);
+
+    CGEventRef optionDown      =       CGEventCreateKeyboardEvent (NULL, (CGKeyCode)kVK_Option, true);
+    CGEventRef optionUp                =       CGEventCreateKeyboardEvent (NULL, (CGKeyCode)kVK_Option, 
false);
+
+    for (i = 0; i < n_keys; i++)
+      {
+        /* Option press. */
+        if (keys[i].group)
+          {
+            CGEventPost (kCGHIDEventTap, optionDown);
+          }
+        /* Shift press. */
+        if (keys[i].level)
+          {
+            CGEventPost(kCGHIDEventTap, shiftDown);
+          }
+        keyDown = CGEventCreateKeyboardEvent (NULL, (CGKeyCode)keys[i].keycode, true);
+        keyUp = CGEventCreateKeyboardEvent (NULL, (CGKeyCode)keys[i].keycode, false);
+        /* Key pressed. */
+        CGEventPost (kCGHIDEventTap, keyDown);
+        CFRelease (keyDown);
+        usleep (100);
+        /* key released */
+        CGEventPost (kCGHIDEventTap, keyUp);
+        CFRelease (keyUp);
+
+        /* Shift release. */
+        if (keys[i].level)
+          {
+            CGEventPost (kCGHIDEventTap, shiftDown);
+          }
+
+        /* Option release. */
+        if (keys[i].group)
+          {
+            CGEventPost (kCGHIDEventTap, optionUp);
+          }
+        /* No need to loop for alternative keycodes. We want only one
+         * key generated. */
+        break;
+      }
+    CFRelease (commandDown);
+    CFRelease (commandUp);
+    CFRelease (shiftDown);
+    CFRelease (shiftUp);
+    CFRelease (optionDown);
+    CFRelease (optionUp);
+    g_free (keys);
+  }
+else
+  {
+    g_warning ("%s: no macOS key mapping found for keyval %d.", G_STRFUNC, keyval);
+  }
+
+#else /* G_OS_WIN32  && ! GTK_CHECK_VERSION (2, 24, 25) && ! GDK_WINDOWING_QUARTZ */
   gdk_test_simulate_key (gtk_widget_get_window (widget),
                          -1, -1, /*x, y*/
                          keyval,