st/settings: Add magnifier activation property and bind to settings

The same code for reading the current magnifier state is repeated in both
shell-recorder, shell-screenshot and magnifier itself.
So to move this inside a property of st-settings so that we can refer to it
all over the places removing duplications.

https://gitlab.gnome.org/GNOME/gnome-shell/merge_requests/473

js/ui/magnifier.js

@@ -18,9 +18,6 @@ var NO_CHANGE = 0.0;
 var POINTER_REST_TIME = 1000; // milliseconds
 
 // Settings
-const APPLICATIONS_SCHEMA       = 'org.gnome.desktop.a11y.applications';
-const SHOW_KEY                  = 'screen-magnifier-enabled';
-
 const MAGNIFIER_SCHEMA          = 'org.gnome.desktop.a11y.magnifier';
 const SCREEN_POSITION_KEY       = 'screen-position';
 const MAG_FACTOR_KEY            = 'mag-factor';
@@ -117,12 +114,16 @@ var Magnifier = class Magnifier {
 
         let aZoomRegion = new ZoomRegion(this, this._cursorRoot);
         this._zoomRegions.push(aZoomRegion);
-        let showAtLaunch = this._settingsInit(aZoomRegion);
+        this._settingsInit(aZoomRegion);
         aZoomRegion.scrollContentsTo(this.xMouse, this.yMouse);
 
+        St.Settings.get().connect('notify::magnifier-active', () => {
+            this.setActive(St.Settings.get().magnifier_active);
+        });
+
         // Export to dbus.
         magDBusService = new MagnifierDBus.ShellMagnifier();
-        this.setActive(showAtLaunch);
+        this.setActive(St.Settings.get().magnifier_active);
     }
 
     /**
@@ -501,13 +502,8 @@ var Magnifier = class Magnifier {
     }
 
     _settingsInit(zoomRegion) {
-        this._appSettings = new Gio.Settings({ schema_id: APPLICATIONS_SCHEMA });
         this._settings = new Gio.Settings({ schema_id: MAGNIFIER_SCHEMA });
 
-        this._appSettings.connect('changed::' + SHOW_KEY, () => {
-            this.setActive(this._appSettings.get_boolean(SHOW_KEY));
-        });
-
         this._settings.connect('changed::' + SCREEN_POSITION_KEY,
                                this._updateScreenPosition.bind(this));
         this._settings.connect('changed::' + MAG_FACTOR_KEY,
@@ -614,8 +610,6 @@ var Magnifier = class Magnifier {
         let showCrosshairs = this._settings.get_boolean(SHOW_CROSS_HAIRS_KEY);
         this.addCrosshairs();
         this.setCrosshairsVisible(showCrosshairs);
-
-        return this._appSettings.get_boolean(SHOW_KEY);
    }
 
     _updateScreenPosition() {

src/shell-recorder.c

@@ -17,15 +17,13 @@
 #include <meta/meta-cursor-tracker.h>
 #include <meta/display.h>
 #include <meta/compositor-mutter.h>
+#include <st/st.h>
 
 #include "shell-global.h"
 #include "shell-recorder-src.h"
 #include "shell-recorder.h"
 #include "shell-util.h"
 
-#define A11Y_APPS_SCHEMA "org.gnome.desktop.a11y.applications"
-#define MAGNIFIER_ACTIVE_KEY "screen-magnifier-enabled"
-
 typedef enum {
   RECORDER_STATE_CLOSED,
   RECORDER_STATE_RECORDING
@@ -58,7 +56,6 @@ struct _ShellRecorder {
   int pointer_x;
   int pointer_y;
 
-  GSettings *a11y_settings;
   gboolean draw_cursor;
   MetaCursorTracker *cursor_tracker;
   cairo_surface_t *cursor_image;
@@ -213,8 +210,6 @@ shell_recorder_init (ShellRecorder *recorder)
 
   recorder->memory_target = get_memory_target();
 
-  recorder->a11y_settings = g_settings_new (A11Y_APPS_SCHEMA);
-
   recorder->state = RECORDER_STATE_CLOSED;
   recorder->framerate = DEFAULT_FRAMES_PER_SECOND;
   recorder->draw_cursor = TRUE;
@@ -239,8 +234,6 @@ shell_recorder_finalize (GObject  *object)
 
   recorder_remove_redraw_timeout (recorder);
 
-  g_clear_object (&recorder->a11y_settings);
-
   G_OBJECT_CLASS (shell_recorder_parent_class)->finalize (object);
 }
 
@@ -465,9 +458,16 @@ recorder_record_frame (ShellRecorder *recorder,
 
   GST_BUFFER_PTS(buffer) = now;
 
-  if (recorder->draw_cursor &&
+  if (recorder->draw_cursor)
-      !g_settings_get_boolean (recorder->a11y_settings, MAGNIFIER_ACTIVE_KEY))
+    {
+      StSettings *settings = st_settings_get ();
+      gboolean magnifier_active = FALSE;
+
+      g_object_get (settings, "magnifier-active", &magnifier_active, NULL);
+
+      if (magnifier_active)
         recorder_draw_cursor (recorder, buffer);
+    }
 
   shell_recorder_src_add_buffer (SHELL_RECORDER_SRC (recorder->current_pipeline->src), buffer);
   gst_buffer_unref (buffer);

src/shell-screenshot.c

@@ -7,14 +7,12 @@
 #include <meta/meta-plugin.h>
 #include <meta/meta-shaped-texture.h>
 #include <meta/meta-cursor-tracker.h>
+#include <st/st.h>
 
 #include "shell-global.h"
 #include "shell-screenshot.h"
 #include "shell-util.h"
 
-#define A11Y_APPS_SCHEMA "org.gnome.desktop.a11y.applications"
-#define MAGNIFIER_ACTIVE_KEY "screen-magnifier-enabled"
-
 typedef struct _ShellScreenshotPrivate  ShellScreenshotPrivate;
 
 struct _ShellScreenshot
@@ -271,9 +269,12 @@ should_draw_cursor_image (ShellScreenshotMode mode)
 {
   if (mode == SHELL_SCREENSHOT_WINDOW || !meta_is_wayland_compositor ())
     {
-      g_autoptr (GSettings) settings = g_settings_new (A11Y_APPS_SCHEMA);
+      StSettings *settings = st_settings_get ();
+      gboolean magnifier_active = FALSE;
 
-      if (!g_settings_get_boolean (settings, MAGNIFIER_ACTIVE_KEY))
+      g_object_get (settings, "magnifier-active", &magnifier_active, NULL);
+
+      if (!magnifier_active)
         return TRUE;
     }
 

src/st/st-settings.c

@@ -30,6 +30,7 @@
 #define KEY_DRAG_THRESHOLD    "drag-threshold"
 #define KEY_GTK_THEME         "gtk-theme"
 #define KEY_GTK_ICON_THEME    "icon-theme"
+#define KEY_MAGNIFIER_ACTIVE "screen-magnifier-enabled"
 
 enum {
   PROP_0,
@@ -38,6 +39,7 @@ enum {
   PROP_DRAG_THRESHOLD,
   PROP_GTK_THEME,
   PROP_GTK_ICON_THEME,
+  PROP_MAGNIFIER_ACTIVE,
   N_PROPS
 };
 
@@ -48,11 +50,13 @@ struct _StSettings
   GObject parent_object;
   GSettings *interface_settings;
   GSettings *mouse_settings;
+  GSettings *a11y_settings;
 
   gchar *gtk_theme;
   gchar *gtk_icon_theme;
   gboolean enable_animations;
   gboolean primary_paste;
+  gboolean magnifier_active;
   gint drag_threshold;
 };
 
@@ -105,6 +109,9 @@ st_settings_get_property (GObject    *object,
     case PROP_GTK_ICON_THEME:
       g_value_set_string (value, settings->gtk_icon_theme);
       break;
+    case PROP_MAGNIFIER_ACTIVE:
+      g_value_set_boolean (value, settings->magnifier_active);
+      break;
     default:
       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
     }
@@ -144,6 +151,11 @@ st_settings_class_init (StSettingsClass *klass)
                                                     "GTK+ Icon Theme",
                                                     "",
                                                     G_PARAM_READABLE);
+  props[PROP_MAGNIFIER_ACTIVE] = g_param_spec_boolean("magnifier-active",
+                                                      "Magnifier is active",
+                                                      "Weather the a11y magnifier is active",
+                                                      FALSE,
+                                                      G_PARAM_READABLE);
 
   g_object_class_install_properties (object_class, N_PROPS, props);
 }
@@ -190,6 +202,18 @@ on_mouse_settings_changed (GSettings   *g_settings,
     }
 }
 
+static void
+on_a11y_settings_changed (GSettings   *g_settings,
+                          const gchar *key,
+                          StSettings  *settings)
+{
+  if (g_str_equal (key, KEY_MAGNIFIER_ACTIVE))
+    {
+      settings->magnifier_active = g_settings_get_boolean (g_settings, key);
+      g_object_notify_by_pspec (G_OBJECT (settings), props[PROP_MAGNIFIER_ACTIVE]);
+    }
+}
+
 static void
 st_settings_init (StSettings *settings)
 {
@@ -201,6 +225,10 @@ st_settings_init (StSettings *settings)
   g_signal_connect (settings->interface_settings, "changed",
                     G_CALLBACK (on_mouse_settings_changed), settings);
 
+  settings->a11y_settings = g_settings_new ("org.gnome.desktop.a11y.applications");
+  g_signal_connect (settings->a11y_settings, "changed",
+                    G_CALLBACK (on_a11y_settings_changed), settings);
+
   settings->enable_animations = g_settings_get_boolean (settings->interface_settings,
                                                         KEY_ENABLE_ANIMATIONS);
   settings->primary_paste = g_settings_get_boolean (settings->interface_settings,
@@ -211,6 +239,8 @@ st_settings_init (StSettings *settings)
                                                     KEY_GTK_ICON_THEME);
   settings->drag_threshold = g_settings_get_int (settings->mouse_settings,
                                                  KEY_DRAG_THRESHOLD);
+  settings->magnifier_active = g_settings_get_boolean (settings->a11y_settings,
+                                                       KEY_MAGNIFIER_ACTIVE);
 }
 
 /**