[sysprof] libsysprof-ui: add label helper

[Christian Hergert <chergert src gnome org>]

commit 0b4510c0278509e5b45849004663c7b0d1b5e724
Author: Christian Hergert <chergert redhat com>
Date:   Mon May 13 22:18:59 2019 -0700

    libsysprof-ui: add label helper

 src/libsysprof-ui/sysprof-zoom-manager.c | 33 ++++++++++++++++++++++++++++++++
 src/libsysprof-ui/sysprof-zoom-manager.h |  2 ++
 2 files changed, 35 insertions(+)
---
diff --git a/src/libsysprof-ui/sysprof-zoom-manager.c b/src/libsysprof-ui/sysprof-zoom-manager.c
index 11e5b17..b54146b 100644
--- a/src/libsysprof-ui/sysprof-zoom-manager.c
+++ b/src/libsysprof-ui/sysprof-zoom-manager.c
@@ -129,6 +129,10 @@ sysprof_zoom_manager_get_property (GObject    *object,
       g_value_set_double (value, sysprof_zoom_manager_get_zoom (self));
       break;
 
+    case PROP_ZOOM_LABEL:
+      g_value_take_string (value, sysprof_zoom_manager_get_zoom_label (self));
+      break;
+
     case PROP_CAN_ZOOM_IN:
       g_value_set_boolean (value, sysprof_zoom_manager_get_can_zoom_in (self));
       break;
@@ -218,6 +222,11 @@ sysprof_zoom_manager_class_init (SysprofZoomManagerClass *klass)
                          1.0,
                          (G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
 
+  properties [PROP_ZOOM_LABEL] =
+    g_param_spec_string ("zoom-label", NULL, NULL,
+                         NULL,
+                         (G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
+
   g_object_class_install_properties (object_class, N_PROPS, properties);
 }
 
@@ -407,6 +416,7 @@ sysprof_zoom_manager_set_zoom (SysprofZoomManager *self,
       g_object_notify_by_pspec (G_OBJECT (self), properties [PROP_ZOOM]);
       g_object_notify_by_pspec (G_OBJECT (self), properties [PROP_CAN_ZOOM_IN]);
       g_object_notify_by_pspec (G_OBJECT (self), properties [PROP_CAN_ZOOM_OUT]);
+      g_object_notify_by_pspec (G_OBJECT (self), properties [PROP_ZOOM_LABEL]);
     }
 }
 
@@ -477,3 +487,26 @@ action_group_iface_init (GActionGroupInterface *iface)
   iface->change_action_state = sysprof_zoom_manager_change_action_state;
   iface->activate_action = sysprof_zoom_manager_activate_action;
 }
+
+/**
+ * sysprof_zoom_manager_get_zoom_level:
+ * @self: a #SysprofZoomManager
+ *
+ * Returns: (transfer full): a string containing the zoom percentage label
+ *
+ * Since: 3.34
+ */
+gchar *
+sysprof_zoom_manager_get_zoom_label (SysprofZoomManager *self)
+{
+  gdouble percent;
+
+  g_return_val_if_fail (SYSPROF_IS_ZOOM_MANAGER (self), NULL);
+
+  percent = self->zoom * 100.0;
+
+  if (percent < 1.0)
+    return g_strdup_printf ("%0.2lf%%", percent);
+  else
+    return g_strdup_printf ("%d%%", (gint)percent);
+}
diff --git a/src/libsysprof-ui/sysprof-zoom-manager.h b/src/libsysprof-ui/sysprof-zoom-manager.h
index a67bc51..62aa45e 100644
--- a/src/libsysprof-ui/sysprof-zoom-manager.h
+++ b/src/libsysprof-ui/sysprof-zoom-manager.h
@@ -62,5 +62,7 @@ gdouble             sysprof_zoom_manager_get_zoom         (SysprofZoomManager *s
 SYSPROF_AVAILABLE_IN_ALL
 void                sysprof_zoom_manager_set_zoom         (SysprofZoomManager *self,
                                                            gdouble             zoom);
+SYSPROF_AVAILABLE_IN_ALL
+gchar              *sysprof_zoom_manager_get_zoom_label   (SysprofZoomManager *self);
 
 G_END_DECLS