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[gtk+/picture: 7/17] gtk: Add a private GtkStyledPicture

commit de3178e2e4e9f494b4cf2fca8d934ab5d3e5ef85
Author: Benjamin Otte <otte redhat com>
Date:   Wed Feb 9 19:42:55 2011 +0100

    gtk: Add a private GtkStyledPicture
    
    It's supposed to handle our use cases for styling. And it's better to
    write this code only once after all.

 gtk/Makefile.am        |    2 +
 gtk/gtkstyledpicture.c |  287 ++++++++++++++++++++++++++++++++++++++++++++++++
 gtk/gtkstyledpicture.h |   65 +++++++++++
 3 files changed, 354 insertions(+), 0 deletions(-)
---
diff --git a/gtk/Makefile.am b/gtk/Makefile.am
index 6094f04..2c64597 100644
--- a/gtk/Makefile.am
+++ b/gtk/Makefile.am
@@ -428,6 +428,7 @@ gtk_private_h_sources =		\
 	gtksizegroup-private.h	\
 	gtksocketprivate.h	\
 	gtkstylecontextprivate.h \
+	gtkstyledpicture.h	\
 	gtktextbtree.h		\
 	gtktextbufferserialize.h \
 	gtktextchildprivate.h	\
@@ -625,6 +626,7 @@ gtk_base_c_sources = 		\
 	gtkstock.c		\
 	gtkstylablepicture.c	\
 	gtkstylecontext.c	\
+	gtkstyledpicture.c	\
 	gtkstyleproperties.c	\
 	gtkstyleprovider.c	\
 	gtkstyle.c		\
diff --git a/gtk/gtkstyledpicture.c b/gtk/gtkstyledpicture.c
new file mode 100644
index 0000000..c7c8976
--- /dev/null
+++ b/gtk/gtkstyledpicture.c
@@ -0,0 +1,287 @@
+/* GTK - The GIMP Drawing Kit
+ * Copyright (C) 2010 Benjamin Otte <otte gnome org>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#include "config.h"
+
+#include "gtkstyledpicture.h"
+
+#include <cairo-gobject.h>
+
+#include "gtkintl.h"
+#include "gtkmarshalers.h"
+#include "gtkprivate.h"
+
+struct _GtkStyledPicturePrivate {
+  GdkPicture *styled;
+
+  GtkWidget *widget;
+  GdkPicture *unstyled;
+};
+
+enum {
+  UPDATE,
+  LAST_SIGNAL
+};
+
+static guint signals[LAST_SIGNAL] = { 0, };
+
+static GdkPicture *
+gtk_styled_picture_attach (GdkPicture *picture,
+                           GtkWidget  *widget)
+{
+  GtkStyledPicture *styled = GTK_STYLED_PICTURE (picture);
+  GtkStyledPicturePrivate *priv = styled->priv;
+
+  g_warning ("styled pictures should not be exposed to the world, did somebody not call gtk_picture_get_unstyled()?");
+
+  return gtk_styled_picture_new (priv->unstyled,
+                                 priv->widget);
+}
+
+static GdkPicture *
+gtk_styled_picture_get_unstyled (GdkPicture *picture)
+{
+  GtkStyledPicture *styled = GTK_STYLED_PICTURE (picture);
+
+  return styled->priv->unstyled;
+}
+
+static void
+gtk_styled_picture_stylable_picture_init (GtkStylablePictureInterface *iface)
+{
+  iface->attach = gtk_styled_picture_attach;
+  iface->get_unstyled = gtk_styled_picture_get_unstyled;
+}
+
+G_DEFINE_TYPE_WITH_CODE (GtkStyledPicture, gtk_styled_picture, GDK_TYPE_PICTURE,
+			 G_IMPLEMENT_INTERFACE (GTK_TYPE_STYLABLE_PICTURE,
+						gtk_styled_picture_stylable_picture_init))
+
+static void
+gdk_styled_picture_resized_callback (GdkPicture *picture,
+                                     GtkStyledPicture *styled)
+{
+  gdk_picture_resized (GDK_PICTURE (styled),
+                       gdk_picture_get_width (picture),
+                       gdk_picture_get_height (picture));
+}
+
+static void
+gtk_styled_picture_set_styled (GtkStyledPicture *styled,
+                               GdkPicture *      picture)
+{
+  GtkStyledPicturePrivate *priv = styled->priv;
+  
+  if (priv->styled == picture)
+    return;
+
+  if (picture)
+    {
+      g_object_ref (picture);
+      g_signal_connect_swapped (picture,
+                                "changed",
+                                G_CALLBACK (gdk_picture_changed_region),
+                                styled);
+      g_signal_connect (picture,
+                        "resized",
+                        G_CALLBACK (gdk_styled_picture_resized_callback),
+                        styled);
+    }
+
+  if (priv->styled)
+    {
+      g_signal_handlers_disconnect_matched (priv->styled,
+                                            G_SIGNAL_MATCH_DATA,
+                                            0, 0, NULL, NULL, styled);
+      g_object_unref (priv->styled);
+    }
+
+  priv->styled = picture;
+
+  if (priv->styled)
+    gdk_picture_resized (GDK_PICTURE (styled),
+                         gdk_picture_get_width (priv->styled),
+                         gdk_picture_get_height (priv->styled));
+  else
+    gdk_picture_resized (GDK_PICTURE (styled), 0, 0);
+}
+
+static void
+gtk_styled_picture_dispose (GObject *object)
+{
+  GtkStyledPicture *styled = GTK_STYLED_PICTURE (object);
+  GtkStyledPicturePrivate *priv = styled->priv;
+
+  gtk_styled_picture_set_styled (styled, NULL);
+
+  if (priv->unstyled)
+    {
+      g_signal_handlers_disconnect_by_func (priv->unstyled,
+                                            gtk_styled_picture_update,
+                                            styled);
+      g_object_unref (priv->unstyled);
+      priv->unstyled = NULL;
+    }
+  if (priv->widget)
+    {
+      g_signal_handlers_disconnect_by_func (priv->widget,
+                                            gtk_styled_picture_update,
+                                            styled);
+      g_object_remove_weak_pointer (G_OBJECT (priv->widget), (void **) &priv->widget);
+      priv->widget = NULL;
+    }
+
+  G_OBJECT_CLASS (gtk_styled_picture_parent_class)->dispose (object);
+}
+
+static cairo_surface_t *
+gtk_styled_picture_ref_surface (GdkPicture *picture)
+{
+  GtkStyledPicture *styled = GTK_STYLED_PICTURE (picture);
+
+  return gdk_picture_ref_surface (styled->priv->styled);
+}
+
+static void
+gtk_styled_picture_draw (GdkPicture *picture,
+                       cairo_t    *cr)
+{
+  GtkStyledPicture *styled = GTK_STYLED_PICTURE (picture);
+
+  gdk_picture_draw (styled->priv->styled, cr);
+}
+
+static gboolean
+gtk_styled_picture_update_accumulator (GSignalInvocationHint *ihint,
+                                       GValue                *return_accu,
+                                       const GValue          *handler_return,
+                                       gpointer               unused)
+{
+  gboolean continue_emission;
+  GObject *object;
+
+  object = g_value_get_object (handler_return);
+  g_value_set_object (return_accu, object);
+  continue_emission = !object;
+
+  return continue_emission;
+}
+
+static void
+gtk_styled_picture_class_init (GtkStyledPictureClass *klass)
+{
+  GObjectClass *object_class = G_OBJECT_CLASS (klass);
+  GdkPictureClass *picture_class = GDK_PICTURE_CLASS (klass);
+
+  object_class->dispose = gtk_styled_picture_dispose;
+
+  picture_class->ref_surface = gtk_styled_picture_ref_surface;
+  picture_class->draw = gtk_styled_picture_draw;
+
+  signals[UPDATE] =
+    g_signal_new (I_("update"),
+                  G_TYPE_FROM_CLASS (object_class),
+                  G_SIGNAL_RUN_LAST,
+                  G_STRUCT_OFFSET (GtkStyledPictureClass, update),
+                  gtk_styled_picture_update_accumulator, NULL,
+                  _gtk_marshal_OBJECT__VOID,
+                  GDK_TYPE_PICTURE, 0);
+
+  g_type_class_add_private (klass, sizeof (GtkStyledPicturePrivate));
+}
+
+static void
+gtk_styled_picture_init (GtkStyledPicture *picture)
+{
+  picture->priv = G_TYPE_INSTANCE_GET_PRIVATE (picture,
+                                               GTK_TYPE_STYLED_PICTURE,
+                                               GtkStyledPicturePrivate);
+}
+
+/**
+ * gtk_styled_picture_new:
+ * @unstyled: The unstyled picture
+ * @widget: The widet to attach to
+ *
+ * Creates a new #GtkStyledPicture displaying the styled version of
+ * an @unstyled #GdkPicture
+ *
+ * Returns: a new picture
+ **/
+GdkPicture *
+gtk_styled_picture_new (GdkPicture *unstyled,
+                        GtkWidget  *widget)
+{
+  GtkStyledPicturePrivate *priv;
+  GtkStyledPicture *styled;
+
+  g_return_val_if_fail (GTK_IS_WIDGET (widget), NULL);
+  g_return_val_if_fail (GDK_IS_PICTURE (unstyled), NULL);
+
+  styled = g_object_new (GTK_TYPE_STYLED_PICTURE, NULL);
+
+  priv = styled->priv;
+
+  priv->widget = widget;
+  g_object_add_weak_pointer (G_OBJECT (widget), (void **) &priv->widget);
+  g_signal_connect_swapped (widget, 
+                            "style-updated",
+                            G_CALLBACK (gtk_styled_picture_update),
+                            styled);
+  g_signal_connect_swapped (widget, 
+                            "state-flags-changed",
+                            G_CALLBACK (gtk_styled_picture_update),
+                            styled);
+  g_signal_connect_swapped (widget, 
+                            "direction-changed",
+                            G_CALLBACK (gtk_styled_picture_update),
+                            styled);
+
+  styled->priv->unstyled = g_object_ref (unstyled);
+  g_signal_connect_swapped (unstyled, 
+                            "notify",
+                            G_CALLBACK (gtk_styled_picture_update),
+                            styled);
+
+  gtk_styled_picture_update (styled);
+
+  return GDK_PICTURE (styled);
+}
+
+void
+gtk_styled_picture_update (GtkStyledPicture *picture)
+{
+  GdkPicture *new_picture = NULL;
+
+  g_signal_emit (picture, signals[UPDATE], 0, &new_picture);
+
+  gtk_styled_picture_set_styled (picture, new_picture);
+
+  if (new_picture)
+    g_object_unref (new_picture);
+}
+
+GtkWidget *
+gtk_styled_picture_get_widget (GtkStyledPicture *picture)
+{
+  g_return_val_if_fail (GTK_IS_STYLED_PICTURE (picture), NULL);
+
+  return picture->priv->widget;
+}
+
diff --git a/gtk/gtkstyledpicture.h b/gtk/gtkstyledpicture.h
new file mode 100644
index 0000000..0fa2e6c
--- /dev/null
+++ b/gtk/gtkstyledpicture.h
@@ -0,0 +1,65 @@
+/* GTK - The GIMP Drawing Kit
+ * Copyright (C) 2010 Benjamin Otte <otte gnome org>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#if !defined (__GTK_H_INSIDE__) && !defined (GTK_COMPILATION)
+#error "Only <gtk/gtk.h> can be included directly."
+#endif
+
+#ifndef __GTK_STYLED_PICTURE_H__
+#define __GTK_STYLED_PICTURE_H__
+
+#include <gtk/gtk.h>
+
+
+G_BEGIN_DECLS
+
+#define GTK_TYPE_STYLED_PICTURE              (gtk_styled_picture_get_type ())
+#define GTK_STYLED_PICTURE(o)                (G_TYPE_CHECK_INSTANCE_CAST ((o), GTK_TYPE_STYLED_PICTURE, GtkStyledPicture))
+#define GTK_STYLED_PICTURE_CLASS(klass)      (G_TYPE_CHECK_CLASS_CAST ((klass), GTK_TYPE_STYLED_PICTURE, GtkStyledPictureClass))
+#define GTK_IS_STYLED_PICTURE(object)        (G_TYPE_CHECK_INSTANCE_TYPE ((object), GTK_TYPE_STYLED_PICTURE))
+#define GTK_IS_STYLED_PICTURE_CLASS(klass)   (G_TYPE_CHECK_CLASS_TYPE ((klass), GTK_TYPE_STYLED_PICTURE))
+#define GTK_STYLED_PICTURE_GET_CLASS(obj)    (G_TYPE_INSTANCE_GET_CLASS ((obj), GTK_TYPE_STYLED_PICTURE, GtkStyledPictureClass))
+
+typedef struct _GtkStyledPicture        GtkStyledPicture;
+typedef struct _GtkStyledPicturePrivate GtkStyledPicturePrivate;
+typedef struct _GtkStyledPictureClass   GtkStyledPictureClass;
+
+struct _GtkStyledPicture {
+  GdkPicture               parent_picture;
+
+  GtkStyledPicturePrivate *priv;
+};
+
+struct _GtkStyledPictureClass {
+  GdkPictureClass       parent_class;
+
+  GdkPicture *          ( *update)                (GtkStyledPicture *picture);
+};
+
+GType           gtk_styled_picture_get_type       (void) G_GNUC_CONST;
+
+GdkPicture *    gtk_styled_picture_new            (GdkPicture *unstyled,
+                                                   GtkWidget  *widget);
+
+void            gtk_styled_picture_update         (GtkStyledPicture *picture);
+GtkWidget *     gtk_styled_picture_get_widget     (GtkStyledPicture *picture);
+
+G_END_DECLS
+
+#endif /* __GTK_STYLED_PICTURE_H__ */
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