[gtk+/wip/cosimoc/combobox-gadget: 1/2] Introduce GtkIcon private class

[Cosimo Cecchi <cosimoc src gnome org>]

commit b9999ca9a45eb251a50d61352185f40ed4624f3f
Author: Cosimo Cecchi <cosimoc gnome org>
Date:   Mon Dec 21 14:46:44 2015 -0800

    Introduce GtkIcon private class
    
    This is an utility widget that wraps a GtkBuiltinIcon for situations
    where using a real widget is more convenient than a gadget.

 gtk/Makefile.am      |    2 +
 gtk/gtkicon.c        |  223 ++++++++++++++++++++++++++++++++++++++++++++++++++
 gtk/gtkiconprivate.h |   56 +++++++++++++
 3 files changed, 281 insertions(+), 0 deletions(-)
---
diff --git a/gtk/Makefile.am b/gtk/Makefile.am
index 77f645d..33eb9cc 100644
--- a/gtk/Makefile.am
+++ b/gtk/Makefile.am
@@ -468,6 +468,7 @@ gtk_private_h_sources =             \
        gtkhslaprivate.h        \
        gtkiconcache.h          \
        gtkiconhelperprivate.h  \
+       gtkiconprivate.h        \
        gtkiconthemeprivate.h  \
        gtkiconviewprivate.h    \
        gtkimagedefinitionprivate.h     \
@@ -741,6 +742,7 @@ gtk_base_c_sources =                \
        gtkgrid.c               \
        gtkheaderbar.c          \
        gtkhsla.c               \
+       gtkicon.c               \
        gtkiconcache.c          \
        gtkiconcachevalidator.c \
        gtkiconhelper.c         \
diff --git a/gtk/gtkicon.c b/gtk/gtkicon.c
new file mode 100644
index 0000000..06c19dc
--- /dev/null
+++ b/gtk/gtkicon.c
@@ -0,0 +1,223 @@
+
+/*
+ * Copyright © 2015 Endless Mobile, Inc.
+ *
+ * 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 2.1 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, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors: Cosimo Cecchi <cosimoc gnome org>
+ */
+
+#include "config.h"
+
+#include "gtkbuiltiniconprivate.h"
+#include "gtkcssnodeprivate.h"
+#include "gtkiconprivate.h"
+#include "gtkwidgetprivate.h"
+
+enum {
+  PROP_0,
+  PROP_CSS_NAME,
+  NUM_PROPERTIES
+};
+
+static GParamSpec *icon_props[NUM_PROPERTIES] = { NULL, };
+
+typedef struct _GtkIconPrivate GtkIconPrivate;
+struct _GtkIconPrivate {
+  GtkCssGadget *gadget;
+};
+
+G_DEFINE_TYPE_WITH_PRIVATE (GtkIcon, gtk_icon, GTK_TYPE_WIDGET)
+
+static void
+gtk_icon_finalize (GObject *object)
+{
+  GtkIcon *self = GTK_ICON (object);
+  GtkIconPrivate *priv = gtk_icon_get_instance_private (self);
+
+  g_clear_object (&priv->gadget);
+
+  G_OBJECT_CLASS (gtk_icon_parent_class)->finalize (object);
+}
+
+static void
+gtk_icon_get_property (GObject      *object,
+                       guint         property_id,
+                       GValue       *value,
+                       GParamSpec   *pspec)
+{
+  GtkIcon *self = GTK_ICON (object);
+
+  switch (property_id)
+    {
+    case PROP_CSS_NAME:
+      g_value_set_string (value, gtk_icon_get_css_name (self));
+      break;
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+      break;
+    }
+}
+
+static void
+gtk_icon_set_property (GObject      *object,
+                       guint         property_id,
+                       const GValue *value,
+                       GParamSpec   *pspec)
+{
+  GtkIcon *self = GTK_ICON (object);
+
+  switch (property_id)
+    {
+    case PROP_CSS_NAME:
+      gtk_icon_set_css_name (self, g_value_get_string (value));
+      break;
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+      break;
+    }
+}
+
+static void
+gtk_icon_get_preferred_height_and_baseline_for_width (GtkWidget *widget,
+                                                      gint       for_width,
+                                                      gint      *minimum,
+                                                      gint      *natural,
+                                                      gint      *minimum_baseline,
+                                                      gint      *natural_baseline)
+{
+  GtkIcon *self = GTK_ICON (widget);
+  GtkIconPrivate *priv = gtk_icon_get_instance_private (self);
+
+  gtk_css_gadget_get_preferred_size (priv->gadget,
+                                     GTK_ORIENTATION_VERTICAL,
+                                     for_width,
+                                     minimum, natural,
+                                     minimum_baseline, natural_baseline);
+}
+
+static void
+gtk_icon_get_preferred_height (GtkWidget *widget,
+                               gint      *minimum,
+                               gint      *natural)
+{
+  gtk_icon_get_preferred_height_and_baseline_for_width (widget, -1,
+                                                        minimum, natural,
+                                                        NULL, NULL);
+}
+
+static void
+gtk_icon_get_preferred_width (GtkWidget *widget,
+                              gint      *minimum,
+                              gint      *natural)
+{
+  GtkIcon *self = GTK_ICON (widget);
+  GtkIconPrivate *priv = gtk_icon_get_instance_private (self);
+
+  gtk_css_gadget_get_preferred_size (priv->gadget,
+                                     GTK_ORIENTATION_HORIZONTAL,
+                                     -1,
+                                     minimum, natural,
+                                     NULL, NULL);
+}
+
+static void
+gtk_icon_size_allocate (GtkWidget     *widget,
+                        GtkAllocation *allocation)
+{
+  GtkIcon *self = GTK_ICON (widget);
+  GtkIconPrivate *priv = gtk_icon_get_instance_private (self);
+  GtkAllocation clip;
+
+  gtk_widget_set_allocation (widget, allocation);
+  gtk_css_gadget_allocate (priv->gadget, allocation,
+                           gtk_widget_get_allocated_baseline (widget),
+                           &clip);
+
+  gtk_widget_set_clip (widget, &clip);
+}
+
+static gboolean
+gtk_icon_draw (GtkWidget *widget,
+               cairo_t   *cr)
+{
+  GtkIcon *self = GTK_ICON (widget);
+  GtkIconPrivate *priv = gtk_icon_get_instance_private (self);
+
+  gtk_css_gadget_draw (priv->gadget, cr);
+
+  return FALSE;
+}
+
+static void
+gtk_icon_class_init (GtkIconClass *klass)
+{
+  GObjectClass *oclass = G_OBJECT_CLASS (klass);
+  GtkWidgetClass *wclass = GTK_WIDGET_CLASS (klass);
+
+  oclass->get_property = gtk_icon_get_property;
+  oclass->set_property = gtk_icon_set_property;
+  oclass->finalize = gtk_icon_finalize;
+
+  wclass->size_allocate = gtk_icon_size_allocate;
+  wclass->get_preferred_width = gtk_icon_get_preferred_width;
+  wclass->get_preferred_height = gtk_icon_get_preferred_height;
+  wclass->get_preferred_height_and_baseline_for_width = gtk_icon_get_preferred_height_and_baseline_for_width;
+  wclass->draw = gtk_icon_draw;
+
+  icon_props[PROP_CSS_NAME] =
+    g_param_spec_string ("css-name", "CSS name",
+                         "CSS name",
+                         NULL,
+                         G_PARAM_READWRITE |
+                         G_PARAM_EXPLICIT_NOTIFY | G_PARAM_STATIC_STRINGS);
+
+  g_object_class_install_properties (oclass, NUM_PROPERTIES, icon_props);
+}
+
+static void
+gtk_icon_init (GtkIcon *self)
+{
+  GtkWidget *widget = GTK_WIDGET (self);
+  GtkIconPrivate *priv = gtk_icon_get_instance_private (self);
+  GtkCssNode *widget_node;
+
+  gtk_widget_set_has_window (widget, FALSE);
+
+  widget_node = gtk_widget_get_css_node (widget);
+  priv->gadget = gtk_builtin_icon_new_for_node (widget_node, widget);
+}
+
+GtkWidget *
+gtk_icon_new (const char *css_name)
+{
+  return g_object_new (GTK_TYPE_ICON,
+                       "css-name", css_name,
+                       NULL);
+}
+
+const char *
+gtk_icon_get_css_name (GtkIcon *self)
+{
+  GtkCssNode *widget_node = gtk_widget_get_css_node (GTK_WIDGET (self));
+  return gtk_css_node_get_name (widget_node);
+}
+
+void
+gtk_icon_set_css_name (GtkIcon    *self,
+                       const char *css_name)
+{
+  GtkCssNode *widget_node = gtk_widget_get_css_node (GTK_WIDGET (self));
+  gtk_css_node_set_name (widget_node, g_intern_string (css_name));
+}
diff --git a/gtk/gtkiconprivate.h b/gtk/gtkiconprivate.h
new file mode 100644
index 0000000..08f8b0f
--- /dev/null
+++ b/gtk/gtkiconprivate.h
@@ -0,0 +1,56 @@
+/*
+ * Copyright © 2015 Endless Mobile, Inc.
+ *
+ * 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 2.1 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, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors: Cosimo Cecchi <cosimoc gnome org>
+ */
+
+#ifndef __GTK_ICON_PRIVATE_H__
+#define __GTK_ICON_PRIVATE_H__
+
+#include "gtk/gtkwidget.h"
+
+G_BEGIN_DECLS
+
+#define GTK_TYPE_ICON           (gtk_icon_get_type ())
+#define GTK_ICON(obj)           (G_TYPE_CHECK_INSTANCE_CAST (obj, GTK_TYPE_ICON, GtkIcon))
+#define GTK_ICON_CLASS(cls)     (G_TYPE_CHECK_CLASS_CAST (cls, GTK_TYPE_ICON, GtkIconClass))
+#define GTK_IS_ICON(obj)        (G_TYPE_CHECK_INSTANCE_TYPE (obj, GTK_TYPE_ICON))
+#define GTK_IS_ICON_CLASS(obj)  (G_TYPE_CHECK_CLASS_TYPE (obj, GTK_TYPE_ICON))
+#define GTK_ICON_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), GTK_TYPE_ICON, GtkIconClass))
+
+typedef struct _GtkIcon           GtkIcon;
+typedef struct _GtkIconClass      GtkIconClass;
+
+struct _GtkIcon
+{
+  GtkWidget parent;
+};
+
+struct _GtkIconClass
+{
+  GtkWidgetClass  parent_class;
+};
+
+GType        gtk_icon_get_type               (void) G_GNUC_CONST;
+
+GtkWidget *  gtk_icon_new                    (const char *css_name);
+const char * gtk_icon_get_css_name           (GtkIcon    *icon);
+void         gtk_icon_set_css_name           (GtkIcon    *icon,
+                                              const char *css_name);
+
+G_END_DECLS
+
+#endif /* __GTK_ICON_PRIVATE_H__ */