libsysprof-gtk: make timelabel available

Realistically, we're going to drop this library anyway and bring it into
sysprof binary itself, so no big deal.

src/libsysprof-gtk/sysprof-time-label.h

@@ -0,0 +1,50 @@
+/* sysprof-time-label.h
+ *
+ * Copyright 2023 Christian Hergert <chergert@redhat.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
+#pragma once
+
+#include <gtk/gtk.h>
+
+G_BEGIN_DECLS
+
+#define SYSPROF_TYPE_TIME_LABEL (sysprof_time_label_get_type())
+
+SYSPROF_AVAILABLE_IN_ALL
+G_DECLARE_FINAL_TYPE (SysprofTimeLabel, sysprof_time_label, SYSPROF, TIME_LABEL, GtkWidget)
+
+SYSPROF_AVAILABLE_IN_ALL
+GtkWidget *sysprof_time_label_new             (void);
+SYSPROF_AVAILABLE_IN_ALL
+gboolean   sysprof_time_label_get_show_zero   (SysprofTimeLabel *self);
+SYSPROF_AVAILABLE_IN_ALL
+void       sysprof_time_label_set_show_zero   (SysprofTimeLabel *self,
+                                               gboolean          show_zero);
+SYSPROF_AVAILABLE_IN_ALL
+gint64     sysprof_time_label_get_duration    (SysprofTimeLabel *self);
+SYSPROF_AVAILABLE_IN_ALL
+void       sysprof_time_label_set_duration    (SysprofTimeLabel *self,
+                                               gint64            duration);
+SYSPROF_AVAILABLE_IN_ALL
+gint64     sysprof_time_label_get_time_offset (SysprofTimeLabel *self);
+SYSPROF_AVAILABLE_IN_ALL
+void       sysprof_time_label_set_time_offset (SysprofTimeLabel *self,
+                                               gint64            time_offset);
+
+G_END_DECLS