menu: Add option to change transparency type in View menu

This allows quicker access rather than repeatedly going to the Preferences dialogue.

app/actions/view-actions.c

@@ -588,6 +588,51 @@ static const GimpToggleActionEntry view_padding_color_toggle_actions[] =
     GIMP_HELP_VIEW_PADDING_COLOR }
 };
 
+static const GimpEnumActionEntry view_check_style_actions[] =
+{
+  { "view-check-style-light-checks", NULL,
+    NC_("view-check-style", "_Light checks"), NULL, { NULL },
+    NC_("view-check-style", "Use light check style for transparency"),
+    GIMP_CHECK_TYPE_LIGHT_CHECKS, FALSE,
+    GIMP_HELP_VIEW_CHECK_STYLE },
+
+  { "view-check-style-midtone-checks", NULL,
+    NC_("view-check-style", "_Mid-tone checks"), NULL, { NULL },
+    NC_("view-check-style", "Use mid-tone check style for transparency"),
+    GIMP_CHECK_TYPE_GRAY_CHECKS, FALSE,
+    GIMP_HELP_VIEW_CHECK_STYLE },
+
+  { "view-check-style-dark-checks", NULL,
+    NC_("view-check-style", "_Dark checks"), NULL, { NULL },
+    NC_("view-check-style", "Use dark check style for transparency"),
+    GIMP_CHECK_TYPE_DARK_CHECKS, FALSE,
+    GIMP_HELP_VIEW_CHECK_STYLE },
+
+  { "view-check-style-white-checks", NULL,
+    NC_("view-check-style", "_White only"), NULL, { NULL },
+    NC_("view-check-style", "Use solid white for transparency"),
+    GIMP_CHECK_TYPE_WHITE_ONLY, FALSE,
+    GIMP_HELP_VIEW_CHECK_STYLE },
+
+  { "view-check-style-gray-checks", NULL,
+    NC_("view-check-style", "_Gray only"), NULL, { NULL },
+    NC_("view-check-style", "Use solid gray for transparency"),
+    GIMP_CHECK_TYPE_GRAY_ONLY, FALSE,
+    GIMP_HELP_VIEW_CHECK_STYLE },
+
+  { "view-check-style-black-checks", NULL,
+    NC_("view-check-style", "_Black only"), NULL, { NULL },
+    NC_("view-check-style", "Use solid black for transparency"),
+    GIMP_CHECK_TYPE_BLACK_ONLY, FALSE,
+    GIMP_HELP_VIEW_CHECK_STYLE },
+
+  { "view-check-style-custom-checks", NULL,
+    NC_("view-check-style", "_Custom checks"), NULL, { NULL },
+    NC_("view-check-style", "Use custom check colors for transparency"),
+    GIMP_CHECK_TYPE_CUSTOM_CHECKS, FALSE,
+    GIMP_HELP_VIEW_CHECK_STYLE }
+};
+
 static const GimpEnumActionEntry view_scroll_horizontal_actions[] =
 {
   { "view-scroll-horizontal", NULL,
@@ -716,6 +761,11 @@ view_actions_setup (GimpActionGroup *group)
                                         view_padding_color_toggle_actions,
                                         G_N_ELEMENTS (view_padding_color_toggle_actions));
 
+  gimp_action_group_add_enum_actions (group, "view-check-style",
+                                      view_check_style_actions,
+                                      G_N_ELEMENTS (view_check_style_actions),
+                                      view_check_style_cmd_callback);
+
   gimp_action_group_add_enum_actions (group, "view-action",
                                       view_scroll_horizontal_actions,
                                       G_N_ELEMENTS (view_scroll_horizontal_actions),
@@ -954,6 +1004,14 @@ view_actions_update (GimpActionGroup *group,
   SET_SENSITIVE ("view-padding-color-in-show-all", image);
   SET_ACTIVE    ("view-padding-color-in-show-all", display && options->padding_in_show_all);
 
+  SET_SENSITIVE ("view-check-style-light-checks",   image);
+  SET_SENSITIVE ("view-check-style-midtone-checks", image);
+  SET_SENSITIVE ("view-check-style-dark-checks",    image);
+  SET_SENSITIVE ("view-check-style-white-checks",   image);
+  SET_SENSITIVE ("view-check-style-gray-checks",    image);
+  SET_SENSITIVE ("view-check-style-black-checks",   image);
+  SET_SENSITIVE ("view-check-style-custom-checks",  image);
+
   SET_SENSITIVE ("view-show-menubar",    image);
   SET_ACTIVE    ("view-show-menubar",    display && options->show_menubar);
   SET_SENSITIVE ("view-show-rulers",     image);

app/actions/view-commands.c

@@ -1120,6 +1120,22 @@ view_padding_color_cmd_callback (GimpAction *action,
     }
 }
 
+void
+view_check_style_cmd_callback (GimpAction *action,
+                               GVariant   *value,
+                               gpointer    data)
+{
+  GimpCheckType       check_style;
+  GimpDisplay        *display;
+  return_if_no_display (display, data);
+
+  check_style = (GimpCheckType) g_variant_get_int32 (value);
+
+  g_object_set (display->config,
+                "transparency-type", check_style,
+                NULL);
+}
+
 void
 view_padding_color_in_show_all_cmd_callback (GimpAction *action,
                                              GVariant   *value,

app/actions/view-commands.h

@@ -166,6 +166,9 @@ void   view_snap_to_equidistance_cmd_callback       (GimpAction *action,
 void   view_padding_color_cmd_callback              (GimpAction *action,
                                                      GVariant   *value,
                                                      gpointer    data);
+void   view_check_style_cmd_callback                (GimpAction *action,
+                                                     GVariant   *value,
+                                                     gpointer    data);
 void   view_padding_color_in_show_all_cmd_callback  (GimpAction *action,
                                                      GVariant   *value,
                                                      gpointer    data);

app/widgets/gimphelp-ids.h

@@ -121,6 +121,7 @@
 #define GIMP_HELP_VIEW_SHOW_SCROLLBARS            "gimp-view-show-scrollbars"
 #define GIMP_HELP_VIEW_SHOW_STATUSBAR             "gimp-view-show-statusbar"
 #define GIMP_HELP_VIEW_PADDING_COLOR              "gimp-view-padding-color"
+#define GIMP_HELP_VIEW_CHECK_STYLE                "gimp-view-check-style"
 #define GIMP_HELP_VIEW_SHRINK_WRAP                "gimp-view-shrink-wrap"
 #define GIMP_HELP_VIEW_FULLSCREEN                 "gimp-view-fullscreen"
 #define GIMP_HELP_VIEW_CHANGE_SCREEN              "gimp-view-change-screen"

menus/image-menu.ui.in.in

@@ -295,6 +295,18 @@
             <item><attribute name="action">app.view-padding-color-prefs</attribute></item>
           </section>
         </submenu>
+        <submenu>
+          <attribute name="label" translatable="yes" context="view-action">Check St_yle</attribute>
+          <section>
+            <item><attribute name="action">app.view-check-style-light-checks</attribute></item>
+            <item><attribute name="action">app.view-check-style-midtone-checks</attribute></item>
+            <item><attribute name="action">app.view-check-style-dark-checks</attribute></item>
+            <item><attribute name="action">app.view-check-style-white-checks</attribute></item>
+            <item><attribute name="action">app.view-check-style-gray-checks</attribute></item>
+            <item><attribute name="action">app.view-check-style-black-checks</attribute></item>
+            <item><attribute name="action">app.view-check-style-custom-checks</attribute></item>
+          </section>
+        </submenu>
         <item><attribute name="action">app.view-show-menubar</attribute></item>
         <item><attribute name="action">app.view-show-rulers</attribute></item>
         <item><attribute name="action">app.view-show-scrollbars</attribute></item>