[gtk+] Inspector: Support extending the inspector using GIOModules

[Matthias Clasen <matthiasc src gnome org>]

commit 2d6ae59d7f0d1bf396e7544d7f211f26bebba074
Author: Alexander Larsson <alexl redhat com>
Date:   Mon Dec 1 15:37:05 2014 +0100

    Inspector: Support extending the inspector using GIOModules
    
    This allows external modules to add a page to the Gtk Inspector.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=740983

 gtk/inspector/init.c   |   24 +++++++++++++++++++++++-
 gtk/inspector/window.c |   40 ++++++++++++++++++++++++++++++++++++++++
 gtk/inspector/window.h |    3 +++
 3 files changed, 66 insertions(+), 1 deletions(-)
---
diff --git a/gtk/inspector/init.c b/gtk/inspector/init.c
index 433fc8d..c930948 100644
--- a/gtk/inspector/init.c
+++ b/gtk/inspector/init.c
@@ -46,9 +46,13 @@
 #include "visual.h"
 #include "window.h"
 
+#include "gtkmodulesprivate.h"
+
 void
 gtk_inspector_init (void)
 {
+  static GIOExtensionPoint *extension_point = NULL;
+
   g_type_ensure (GTK_TYPE_CELL_RENDERER_GRAPH);
   g_type_ensure (GTK_TYPE_GRAPH_DATA);
   g_type_ensure (GTK_TYPE_INSPECTOR_ACTIONS);
@@ -70,7 +74,25 @@ gtk_inspector_init (void)
   g_type_ensure (GTK_TYPE_INSPECTOR_STYLE_PROP_LIST);
   g_type_ensure (GTK_TYPE_INSPECTOR_VISUAL);
   g_type_ensure (GTK_TYPE_INSPECTOR_WINDOW);
-}
 
+  if (extension_point == NULL)
+    {
+      GIOModuleScope *scope;
+      gchar **paths;
+      int i;
+
+      extension_point = g_io_extension_point_register ("gtk-inspector-page");
+      g_io_extension_point_set_required_type (extension_point, GTK_TYPE_WIDGET);
+
+      paths = _gtk_get_module_path ("inspector");
+      scope = g_io_module_scope_new (G_IO_MODULE_SCOPE_BLOCK_DUPLICATES);
+
+      for (i = 0; paths[i] != NULL; i++)
+        g_io_modules_load_all_in_directory_with_scope (paths[i], scope);
+
+      g_strfreev (paths);
+      g_io_module_scope_free (scope);
+    }
+}
 
 // vim: set et sw=2 ts=2:
diff --git a/gtk/inspector/window.c b/gtk/inspector/window.c
index 5892ca5..a7b5f82 100644
--- a/gtk/inspector/window.c
+++ b/gtk/inspector/window.c
@@ -47,6 +47,7 @@
 #include "gtkbutton.h"
 #include "gtkstack.h"
 #include "gtktreeviewcolumn.h"
+#include "gtkmodulesprivate.h"
 #include "gtkwindow.h"
 #include "gtkwindowgroup.h"
 
@@ -56,6 +57,8 @@ static gboolean
 set_selected_object (GtkInspectorWindow *iw,
                      GObject            *selected)
 {
+  GList *l;
+
   if (!gtk_inspector_prop_list_set_object (GTK_INSPECTOR_PROP_LIST (iw->prop_list), selected))
     return FALSE;
 
@@ -73,6 +76,9 @@ set_selected_object (GtkInspectorWindow *iw,
   gtk_inspector_menu_set_object (GTK_INSPECTOR_MENU (iw->menu), selected);
   gtk_inspector_gestures_set_object (GTK_INSPECTOR_GESTURES (iw->gestures), selected);
 
+  for (l = iw->extra_pages; l != NULL; l = l->next)
+    g_object_set (l->data, "object", selected, NULL);
+
   return TRUE;
 }
 
@@ -129,9 +135,42 @@ open_object_details (GtkWidget *button, GtkInspectorWindow *iw)
 static void
 gtk_inspector_window_init (GtkInspectorWindow *iw)
 {
+  GIOExtensionPoint *extension_point;
+  GList *l, *extensions;
+
   gtk_widget_init_template (GTK_WIDGET (iw));
 
   gtk_window_group_add_window (gtk_window_group_new (), GTK_WINDOW (iw));
+
+  extension_point = g_io_extension_point_lookup ("gtk-inspector-page");
+  extensions = g_io_extension_point_get_extensions (extension_point);
+
+  for (l = extensions; l != NULL; l = l->next)
+    {
+      GIOExtension *extension = l->data;
+      GType type;
+      GtkWidget *widget;
+      char *title;
+      GtkWidget *box;
+
+      type = g_io_extension_get_type (extension);
+
+      widget = g_object_new (type, NULL);
+
+      iw->extra_pages = g_list_prepend (iw->extra_pages, widget);
+
+      g_object_get (widget, "title", &title, NULL);
+      gtk_stack_add_titled (GTK_STACK (iw->top_stack), widget,
+                            g_io_extension_get_name (extension),
+                            title);
+      box = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 0);
+      gtk_stack_add_named (GTK_STACK (iw->button_stack), box,
+                           g_io_extension_get_name (extension));
+
+      gtk_widget_show (box);
+      gtk_widget_show (widget);
+    }
+
 }
 
 static void
@@ -155,6 +194,7 @@ gtk_inspector_window_class_init (GtkInspectorWindowClass *klass)
   gtk_widget_class_set_template_from_resource (widget_class, "/org/gtk/libgtk/inspector/window.ui");
 
   gtk_widget_class_bind_template_child (widget_class, GtkInspectorWindow, top_stack);
+  gtk_widget_class_bind_template_child (widget_class, GtkInspectorWindow, button_stack);
   gtk_widget_class_bind_template_child (widget_class, GtkInspectorWindow, object_stack);
   gtk_widget_class_bind_template_child (widget_class, GtkInspectorWindow, object_tree);
   gtk_widget_class_bind_template_child (widget_class, GtkInspectorWindow, object_details);
diff --git a/gtk/inspector/window.h b/gtk/inspector/window.h
index e2aa87c..8560e0c 100644
--- a/gtk/inspector/window.h
+++ b/gtk/inspector/window.h
@@ -43,6 +43,7 @@ typedef struct
 
   GtkWidget *top_stack;
   GtkWidget *object_stack;
+  GtkWidget *button_stack;
   GtkWidget *object_tree;
   GtkWidget *object_id;
   GtkWidget *object_details;
@@ -68,6 +69,8 @@ typedef struct
   GtkWidget *selected_widget;
   GtkWidget *flash_widget;
 
+  GList *extra_pages;
+
   gboolean grabbed;
 
   gint flash_count;