[goffice] GocCanvas: add style context.

[Morten Welinder <mortenw src gnome org>]

commit 137ed291216692f9c84f48b13ba68ff53bfd723d
Author: Morten Welinder <terra gnome org>
Date:   Sun Mar 24 09:47:27 2013 -0400

    GocCanvas: add style context.

 ChangeLog                   |    5 ++++
 NEWS                        |    1 +
 goffice/canvas/goc-canvas.c |   14 +++++++++---
 goffice/canvas/goc-item.c   |   44 +++++++++++++++++++++++++++++++++++++++++++
 goffice/canvas/goc-item.h   |   10 ++++++++-
 5 files changed, 69 insertions(+), 5 deletions(-)
---
diff --git a/ChangeLog b/ChangeLog
index b0fd208..7301395 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2013-03-23  Morten Welinder  <terra gnome org>
+
+       * goffice/canvas/goc-item.c (goc_item_get_style_context): New
+       function.
+
 2013-03-22  Morten Welinder  <terra gnome org>
 
        * goffice/gtk/go-optionmenu.c (go_option_menu_position): Plug
diff --git a/NEWS b/NEWS
index ea8554c..97165b4 100644
--- a/NEWS
+++ b/NEWS
@@ -8,6 +8,7 @@ Morten:
        * Rewrite font selector.  [#695031]
        * Fix GOComboColor signal problem.  [#696022]
        * Plug leaks.
+       * Enhance canvas with posibility of css.
 
 --------------------------------------------------------------------------
 goffice 0.10.1:
diff --git a/goffice/canvas/goc-canvas.c b/goffice/canvas/goc-canvas.c
index 94d20bd..1fd1b52 100644
--- a/goffice/canvas/goc-canvas.c
+++ b/goffice/canvas/goc-canvas.c
@@ -322,12 +322,18 @@ goc_canvas_init (GocCanvas *canvas)
 #endif
 }
 
-GSF_CLASS (GocCanvas, goc_canvas,
-          goc_canvas_class_init, goc_canvas_init,
 #ifdef GOFFICE_WITH_GTK
-          GTK_TYPE_LAYOUT)
+#define CANVAS_BASE_TYPE GTK_TYPE_LAYOUT
 #else
-          G_TYPE_OBJECT)
+#define CANVAS_BASE_TYPE G_TYPE_OBJECT
+#endif
+
+
+GSF_CLASS (GocCanvas, goc_canvas,
+          goc_canvas_class_init, goc_canvas_init,
+          CANVAS_BASE_TYPE)
+#if 0
+;
 #endif
 
 /**
diff --git a/goffice/canvas/goc-item.c b/goffice/canvas/goc-item.c
index ab33fcf..367db02 100644
--- a/goffice/canvas/goc-item.c
+++ b/goffice/canvas/goc-item.c
@@ -117,6 +117,10 @@ enum {
 
 static GObjectClass *item_parent_class;
 
+static GParamSpecPool *style_property_spec_pool;
+static GQuark quark_property_parser;
+static GQuark quark_style_context;
+
 static gboolean
 goc_item_button_pressed (GocItem *item, int button, double x, double y)
 {
@@ -278,6 +282,10 @@ goc_item_class_init (GocItemClass *item_klass)
        item_klass->key_pressed = goc_item_key_pressed;
        item_klass->key_released = goc_item_key_released;
 #endif
+
+       style_property_spec_pool = g_param_spec_pool_new (FALSE);
+       quark_property_parser = g_quark_from_static_string ("gtk-rc-property-parser");
+       quark_style_context = g_quark_from_static_string ("GocItem::style-context");
 }
 
 static void
@@ -832,3 +840,39 @@ _goc_item_transform (GocItem const *item, cairo_t *cr, gboolean scaled)
        }
        cairo_transform (cr, &m);
 }
+
+#ifdef GOFFICE_WITH_GTK
+/**
+ * goc_item_get_style_context:
+ * @item: #GocItem
+ *
+ * Returns: (transfer none): The style context to use for the item.
+ */
+GtkStyleContext *
+goc_item_get_style_context (const GocItem *item)
+{
+       GtkStyleContext *context;
+       g_return_val_if_fail (GOC_IS_ITEM (item), NULL);
+
+       context = g_object_get_qdata (G_OBJECT (item), quark_style_context);
+       if (!context) {
+               GtkWidgetPath *path;
+
+               path = gtk_widget_path_new ();
+               gtk_widget_path_append_type (path,
+                                            G_TYPE_FROM_INSTANCE (item));
+
+               context = gtk_style_context_new ();
+               gtk_style_context_set_path (context, path);
+               gtk_style_context_set_parent (context,
+                                             gtk_widget_get_style_context (GTK_WIDGET (item->canvas)));
+
+               g_object_set_qdata_full (G_OBJECT (item),
+                                        quark_style_context,
+                                        context,
+                                        g_object_unref);
+       }
+
+       return context;
+}
+#endif
diff --git a/goffice/canvas/goc-item.h b/goffice/canvas/goc-item.h
index e7f7590..5dfb00c 100644
--- a/goffice/canvas/goc-item.h
+++ b/goffice/canvas/goc-item.h
@@ -38,6 +38,10 @@ struct _GocItem {
        cairo_operator_t         op;
        cairo_matrix_t          transform; /* not used for now */
        gboolean                transformed; /* TRUE if the matrix is not identity */
+
+       /* FIXME: Next development release needs to add style context and
+          room for expansion.  */
+
        gpointer                 priv;
 };
 
@@ -65,8 +69,8 @@ struct _GocItemClass {
        gboolean                (*key_pressed) (GocItem *item, GdkEventKey* ev);
        gboolean                (*key_released) (GocItem *item, GdkEventKey* ev);
        GdkWindow*              (*get_window) (GocItem *item);
-       /* <private> */
 #endif
+       /* <private> */
        void (*reserved1) (void);
        void (*reserved2) (void);
        void (*reserved3) (void);
@@ -117,6 +121,10 @@ void                goc_item_set_operator  (GocItem *item, cairo_operator_t op);
 cairo_operator_t goc_item_get_operator  (GocItem *item);
 void            goc_item_set_transform (GocItem *item, cairo_matrix_t *m);
 
+#ifdef GOFFICE_WITH_GTK
+GtkStyleContext *goc_item_get_style_context (const GocItem *item);
+#endif
+
 G_END_DECLS
 
 #endif  /* GOC_ITEM_H */