[gnome-control-center/rhel/8.4.0: 7/32] wacom: Update "Test your settings" button sensitivity on device availability

[Ray Strode <halfline src gnome org>]

commit 316f3e47ba802f3db1c1bdd45cc4b25b6ccf14f4
Author: Carlos Garnacho <carlosg gnome org>
Date:   Mon Feb 11 20:48:23 2019 +0100

    wacom: Update "Test your settings" button sensitivity on device availability
    
    The button/popover are meaningless if there's no device to test with. Set
    it inactive (so the popover hides if visible) and set insensitive if no
    devices are found.
    
    https://gitlab.gnome.org/GNOME/gnome-control-center/merge_requests/390

 panels/wacom/cc-wacom-panel.c | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)
---
diff --git a/panels/wacom/cc-wacom-panel.c b/panels/wacom/cc-wacom-panel.c
index 77a1e261f..e4f3ca7fc 100644
--- a/panels/wacom/cc-wacom-panel.c
+++ b/panels/wacom/cc-wacom-panel.c
@@ -53,6 +53,7 @@ struct _CcWacomPanelPrivate
        GtkWidget        *stylus_notebook;
        GtkWidget        *test_popover;
        GtkWidget        *test_draw_area;
+       GtkWidget        *test_button;
        GHashTable       *devices; /* key=GsdDevice, value=CcWacomDevice */
        GHashTable       *pages; /* key=device name, value=GtkWidget */
        GHashTable       *stylus_pages; /* key=CcWacomTool, value=GtkWidget */
@@ -309,6 +310,22 @@ add_stylus (CcWacomPanel *self,
        return TRUE;
 }
 
+static void
+update_test_button (CcWacomPanel *self)
+{
+       CcWacomPanelPrivate *priv = self->priv;;
+
+       if (!priv->test_button)
+               return;
+
+       if (g_hash_table_size (priv->devices) == 0) {
+               gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (priv->test_button), FALSE);
+               gtk_widget_set_sensitive (priv->test_button, FALSE);
+       } else {
+               gtk_widget_set_sensitive (priv->test_button, TRUE);
+       }
+}
+
 static void
 update_current_tool (CcWacomPanel  *panel,
                     GdkDevice     *device,
@@ -422,6 +439,9 @@ cc_wacom_panel_constructed (GObject *object)
 
        g_signal_connect_object (shell, "event",
                                 G_CALLBACK (on_shell_event_cb), self, 0);
+
+       priv->test_button = button;
+       update_test_button (self);
 }
 
 static const char *
@@ -561,6 +581,8 @@ update_current_page (CcWacomPanel  *self,
                if (num_pages > 1)
                        gtk_notebook_set_current_page (GTK_NOTEBOOK (priv->tablet_notebook), 1);
        }
+
+       update_test_button (self);
 }
 
 static void