[mutter] keybindings: Add a switch-monitor builtin keybinding

[Rui Matos <rtcm src gnome org>]

commit 7e330bd65f9ce38744dbaf2084825c1420af892c
Author: Rui Matos <tiagomatos gmail com>
Date:   Wed Jun 7 19:07:26 2017 +0200

    keybindings: Add a switch-monitor builtin keybinding
    
    Moved from g-s-d's media keys plugin, where it was called "video-out",
    since it requires changing the current monitor configuration and we
    want to remove the old DBus API.
    
    This implementation is intentionally simple and not really meant for
    more than debugging and validating the various configurations. A
    better user experience will be introduced in gnome-shell with a custom
    keybinding handler.
    
    The default value includes <Super>P in addition to the standard keysym
    for historical reasons.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=781906

 data/org.gnome.mutter.gschema.xml.in |    5 +++++
 src/core/keybindings.c               |   28 ++++++++++++++++++++++++++++
 src/meta/prefs.h                     |    1 +
 3 files changed, 34 insertions(+), 0 deletions(-)
---
diff --git a/data/org.gnome.mutter.gschema.xml.in b/data/org.gnome.mutter.gschema.xml.in
index 7038178..4ced07f 100644
--- a/data/org.gnome.mutter.gschema.xml.in
+++ b/data/org.gnome.mutter.gschema.xml.in
@@ -156,6 +156,11 @@
       <summary>Cancel tab popup</summary>
     </key>
 
+    <key name="switch-monitor" type="as">
+      <default><![CDATA[['<Super>p','XF86Display']]]></default>
+      <summary>Switch monitor configurations</summary>
+    </key>
+
     <key name="rotate-monitor" type="as">
       <default><![CDATA[['XF86RotateWindows']]]></default>
       <summary>Rotates the built-in monitor configuration</summary>
diff --git a/src/core/keybindings.c b/src/core/keybindings.c
index c7e3c88..518416c 100644
--- a/src/core/keybindings.c
+++ b/src/core/keybindings.c
@@ -3329,6 +3329,27 @@ handle_switch_vt (MetaDisplay     *display,
 #endif /* HAVE_NATIVE_BACKEND */
 
 static void
+handle_switch_monitor (MetaDisplay    *display,
+                       MetaScreen     *screen,
+                       MetaWindow     *window,
+                       ClutterKeyEvent *event,
+                       MetaKeyBinding *binding,
+                       gpointer        dummy)
+{
+  MetaBackend *backend = meta_get_backend ();
+  MetaMonitorManager *monitor_manager =
+    meta_backend_get_monitor_manager (backend);
+  MetaMonitorSwitchConfigType config_type =
+    meta_monitor_manager_get_switch_config (monitor_manager);
+
+  if (!meta_monitor_manager_can_switch_config (monitor_manager))
+    return;
+
+  config_type = (config_type + 1) % (META_MONITOR_SWITCH_CONFIG_UNKNOWN);
+  meta_monitor_manager_switch_config (monitor_manager, config_type);
+}
+
+static void
 handle_rotate_monitor (MetaDisplay    *display,
                        MetaScreen     *screen,
                        MetaWindow     *window,
@@ -3633,6 +3654,13 @@ init_builtin_key_bindings (MetaDisplay *display)
                           handle_set_spew_mark, 0);
 
   add_builtin_keybinding (display,
+                          "switch-monitor",
+                          mutter_keybindings,
+                          META_KEY_BINDING_NONE,
+                          META_KEYBINDING_ACTION_SWITCH_MONITOR,
+                          handle_switch_monitor, 0);
+
+  add_builtin_keybinding (display,
                           "rotate-monitor",
                           mutter_keybindings,
                           META_KEY_BINDING_NONE,
diff --git a/src/meta/prefs.h b/src/meta/prefs.h
index 961d5ab..a0175ae 100644
--- a/src/meta/prefs.h
+++ b/src/meta/prefs.h
@@ -357,6 +357,7 @@ typedef enum _MetaKeyBindingAction
   META_KEYBINDING_ACTION_OVERLAY_KEY,
   META_KEYBINDING_ACTION_ISO_NEXT_GROUP,
   META_KEYBINDING_ACTION_ALWAYS_ON_TOP,
+  META_KEYBINDING_ACTION_SWITCH_MONITOR,
   META_KEYBINDING_ACTION_ROTATE_MONITOR,
 
   META_KEYBINDING_ACTION_LAST