libsysprof-gtk: start on GTK widgetry library

This is ultimately to replace libsysprof-ui, and will focus on the display
of capture files. Recording will be left to the sysprof application in
terms of UI, and other applications like IDEs will use the
libsysprof-profile API directly along with libsysprof-gtk for visualizing.

src/libsysprof-gtk/sysprof-callgraph-view-private.h

@@ -0,0 +1,55 @@
+/* sysprof-callgraph-view-private.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 "sysprof-callgraph-view.h"
+
+G_BEGIN_DECLS
+
+#define SYSPROF_CALLGRAPH_VIEW_GET_CLASS(instance) G_TYPE_INSTANCE_GET_CLASS(instance, SYSPROF_TYPE_CALLGRAPH_VIEW, SysprofCallgraphViewClass)
+
+struct _SysprofCallgraphView
+{
+  GtkWidget parent_instance;
+
+  SysprofDocument *document;
+  GListModel *traceables;
+
+  GtkColumnView *column_view;
+  GtkWidget *scrolled_window;
+
+  GCancellable *cancellable;
+
+  guint reload_source;
+};
+
+struct _SysprofCallgraphViewClass
+{
+  GtkWidgetClass parent_class;
+
+  gsize augment_size;
+  void (*augment_func) (SysprofCallgraph     *callgraph,
+                        SysprofCallgraphNode *node,
+                        SysprofDocumentFrame *frame,
+                        gpointer              user_data);
+};
+
+G_END_DECLS