[gnome-control-center/wip/benzea/display-settings-widget: 4/14] display: Allow config to be modified in arrangement widget

[Benjamin Berg <bberg src gnome org>]

commit e8b670508ef7fe28d1b9f4277fc6cb2c6a2e28be
Author: Benjamin Berg <bberg redhat com>
Date:   Sat Jan 19 23:33:18 2019 +0100

    display: Allow config to be modified in arrangement widget

 panels/display/cc-display-arrangement.c | 94 +++++++++++++++++++++------------
 panels/display/cc-display-arrangement.h |  4 ++
 2 files changed, 63 insertions(+), 35 deletions(-)
---
diff --git a/panels/display/cc-display-arrangement.c b/panels/display/cc-display-arrangement.c
index 630c72e8d..ddf88ea4d 100644
--- a/panels/display/cc-display-arrangement.c
+++ b/panels/display/cc-display-arrangement.c
@@ -524,36 +524,6 @@ on_output_changed_cb (CcDisplayArrangement *self,
   gtk_widget_queue_draw (GTK_WIDGET (self));
 }
 
-static void
-cc_display_arrangement_set_config (CcDisplayArrangement *self,
-                                   CcDisplayConfig      *config)
-{
-  const gchar *signals[] = { "rotation", "mode", "primary", "active", "scale", "position-changed", 
"is-usable" };
-  GList *outputs, *l;
-  guint i;
-
-  g_assert (self->config == NULL);
-
-  self->config = g_object_ref (config);
-
-  /* Listen to all the signals */
-  if (self->config)
-    {
-      outputs = cc_display_config_get_monitors (self->config);
-      for (l = outputs; l; l = l->next)
-        {
-          CcDisplayMonitor *output = l->data;
-
-          for (i = 0; i < G_N_ELEMENTS (signals); ++i)
-            g_signal_connect_object (output, signals[i], G_CALLBACK (on_output_changed_cb), self, 
G_CONNECT_SWAPPED);
-        }
-    }
-
-  cc_display_arrangement_set_selected_output (self, NULL);
-
-  g_object_notify_by_pspec (G_OBJECT (self), props[PROP_CONFIG]);
-}
-
 static gboolean
 cc_display_arrangement_draw (GtkWidget *widget,
                              cairo_t   *cr)
@@ -563,7 +533,8 @@ cc_display_arrangement_draw (GtkWidget *widget,
   g_autoptr(GList) outputs = NULL;
   GList *l;
 
-  g_return_val_if_fail (self->config, FALSE);
+  if (!self->config)
+    return FALSE;
 
   cc_display_arrangement_update_matrices (self);
 
@@ -694,6 +665,9 @@ cc_display_arrangement_button_press_event (GtkWidget      *widget,
   gdouble event_x, event_y;
   gint mon_x, mon_y;
 
+  if (!self->config)
+    return FALSE;
+
   /* Only handle normal presses of the left mouse button. */
   if (event->button != 1 || event->type != GDK_BUTTON_PRESS)
     return FALSE;
@@ -729,6 +703,9 @@ cc_display_arrangement_button_release_event (GtkWidget      *widget,
   CcDisplayArrangement *self = CC_DISPLAY_ARRANGEMENT (widget);
   CcDisplayMonitor *output;
 
+  if (!self->config)
+    return FALSE;
+
   /* Only handle left mouse button */
   if (event->button != 1)
     return FALSE;
@@ -758,7 +735,8 @@ cc_display_arrangement_motion_notify_event (GtkWidget      *widget,
   gint mon_x, mon_y;
   SnapData snap_data;
 
-  g_return_val_if_fail (self->config, FALSE);
+  if (!self->config)
+    return FALSE;
 
   if (cc_display_config_count_useful_monitors (self->config) <= 1)
     return FALSE;
@@ -877,7 +855,7 @@ cc_display_arrangement_class_init (CcDisplayArrangementClass *klass)
   props[PROP_CONFIG] = g_param_spec_object ("config", "Display Config",
                                             "The display configuration to work with",
                                             CC_TYPE_DISPLAY_CONFIG,
-                                            G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY | 
G_PARAM_STATIC_STRINGS);
+                                            G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS);
 
   props[PROP_SELECTED_OUTPUT] = g_param_spec_object ("selected-output", "Selected Output",
                                                      "The output that is currently selected on the 
configuration",
@@ -911,11 +889,57 @@ cc_display_arrangement_new (CcDisplayConfig *config)
   return g_object_new (CC_TYPE_DISPLAY_ARRANGEMENT, "config", config, NULL);
 }
 
-CcDisplayMonitor*
-cc_display_arrangement_get_selected_output (CcDisplayArrangement *self)
+CcDisplayConfig*
+cc_display_arrangement_get_config (CcDisplayArrangement *self)
+{
+  return self->config;
+}
+
+void
+cc_display_arrangement_set_config (CcDisplayArrangement *self,
+                                   CcDisplayConfig      *config)
 {
+  const gchar *signals[] = { "rotation", "mode", "primary", "active", "scale", "position-changed", 
"is-usable" };
+  GList *outputs, *l;
+  guint i;
+
+  if (self->config)
+    {
+      outputs = cc_display_config_get_monitors (self->config);
+      for (l = outputs; l; l = l->next)
+        {
+          CcDisplayMonitor *output = l->data;
+
+          g_signal_handlers_disconnect_by_data (output, self);
+        }
+    }
+  g_clear_object (&self->config);
 
+  self->drag_active = FALSE;
 
+  /* Listen to all the signals */
+  if (config)
+    {
+      self->config = g_object_ref (config);
+
+      outputs = cc_display_config_get_monitors (self->config);
+      for (l = outputs; l; l = l->next)
+        {
+          CcDisplayMonitor *output = l->data;
+
+          for (i = 0; i < G_N_ELEMENTS (signals); ++i)
+            g_signal_connect_object (output, signals[i], G_CALLBACK (on_output_changed_cb), self, 
G_CONNECT_SWAPPED);
+        }
+    }
+
+  cc_display_arrangement_set_selected_output (self, NULL);
+
+  g_object_notify_by_pspec (G_OBJECT (self), props[PROP_CONFIG]);
+}
+
+CcDisplayMonitor*
+cc_display_arrangement_get_selected_output (CcDisplayArrangement *self)
+{
   return self->selected_output;
 }
 
diff --git a/panels/display/cc-display-arrangement.h b/panels/display/cc-display-arrangement.h
index 8d0e39bc0..9494c484b 100644
--- a/panels/display/cc-display-arrangement.h
+++ b/panels/display/cc-display-arrangement.h
@@ -30,6 +30,10 @@ G_DECLARE_FINAL_TYPE (CcDisplayArrangement, cc_display_arrangement, CC, DISPLAY_
 
 CcDisplayArrangement* cc_display_arrangement_new                 (CcDisplayConfig      *config);
 
+CcDisplayConfig*      cc_display_arrangement_get_config          (CcDisplayArrangement *self);
+void                  cc_display_arrangement_set_config          (CcDisplayArrangement *self,
+                                                                  CcDisplayConfig      *config);
+
 CcDisplayMonitor*     cc_display_arrangement_get_selected_output (CcDisplayArrangement *arr);
 void                  cc_display_arrangement_set_selected_output (CcDisplayArrangement *arr,
                                                                   CcDisplayMonitor     *output);