1 files changed, 218 insertions, 0 deletions
diff --git a/src/indicator-image-helper.c b/src/indicator-image-helper.c
new file mode 100644
index 0000000..2c0e244
--- /dev/null
+++ b/src/indicator-image-helper.c
@@ -0,0 +1,218 @@
+/*
+A little helper to make a themed image with fallbacks that
+is only constrained in the vertical dimention.
+
+Copyright 2010 Canonical Ltd.
+
+Authors:
+    Ted Gould <ted@canonical.com>
+
+This library is free software; you can redistribute it and/or
+modify it under the terms of the GNU General Public License
+version 3.0 as published by the Free Software Foundation.
+
+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 General Public License version 3.0 for more details.
+
+You should have received a copy of the GNU General Public
+License along with this library. If not, see
+<http://www.gnu.org/licenses/>.
+*/
+
+#include <math.h>
+#include "indicator-image-helper.h"
+
+const gchar * INDICATOR_NAMES_DATA = "indicator-names-data";
+const gint ICON_SIZE = 22;
+
+static void
+refresh_image (GtkImage * image)
+{
+	g_return_if_fail(GTK_IS_IMAGE(image));
+	const gchar * icon_filename = NULL;
+	GtkIconInfo * icon_info = NULL;
+
+	GIcon * icon_names = (GIcon *)g_object_get_data(G_OBJECT(image), INDICATOR_NAMES_DATA);
+	g_return_if_fail(G_IS_ICON (icon_names));
+
+	/* Get the default theme */
+	GtkIconTheme * default_theme = gtk_icon_theme_get_default();
+	g_return_if_fail(default_theme != NULL);
+
+	/* Look through the themes for that icon */
+	icon_info = gtk_icon_theme_lookup_by_gicon(default_theme, icon_names, ICON_SIZE, 0);
+	if (icon_info == NULL) {
+		/* Maybe the icon was just added to the theme, see if a rescan helps */
+		gtk_icon_theme_rescan_if_needed(default_theme);
+		icon_info = gtk_icon_theme_lookup_by_gicon(default_theme, icon_names, ICON_SIZE, 0);
+	}
+	if (icon_info == NULL) {
+		/* Try using the second item in the names, which should be the original filename supplied */
+		const gchar * const * names = g_themed_icon_get_names(G_THEMED_ICON( icon_names ));
+		if (names) {
+			icon_filename = names[1];
+		} else {
+			g_warning("Unable to find icon\n");
+			gtk_image_clear(image);
+			return;
+		}
+	} else {
+		/* Grab the filename */
+		icon_filename = gtk_icon_info_get_filename(icon_info);
+	}
+
+	if (icon_filename == NULL && !G_IS_BYTES_ICON(icon_names)) {
+		/* show a broken image if we don't have a filename or image data */
+		gtk_image_set_from_icon_name(image, "image-missing", GTK_ICON_SIZE_LARGE_TOOLBAR);
+		return;
+	}
+
+	if (icon_info != NULL && !G_IS_BYTES_ICON(icon_names)) {
+		GdkPixbuf *pixbuf = gtk_icon_info_load_icon(icon_info, NULL);
+
+		if (gdk_pixbuf_get_height(pixbuf) < ICON_SIZE) {
+			gtk_image_set_from_file(image, icon_filename);
+		} else {
+			gtk_image_set_from_gicon(image, icon_names, GTK_ICON_SIZE_LARGE_TOOLBAR);
+		}
+		g_object_unref (pixbuf);
+	} else if (icon_filename != NULL) {
+		gtk_image_set_from_file(image, icon_filename);
+
+		gint height;
+		gdk_pixbuf_get_file_info(icon_filename, NULL, &height);
+
+		if (height > ICON_SIZE) {
+			gtk_image_set_pixel_size(image, ICON_SIZE);
+		}
+	} else if (G_IS_LOADABLE_ICON(icon_names)) {
+		/* Build a pixbuf if needed */
+		GdkPixbuf * pixbuf = NULL;
+		GError * error = NULL;
+		GInputStream * stream = g_loadable_icon_load(G_LOADABLE_ICON(icon_names), ICON_SIZE, NULL, NULL, &error);
+
+		if (stream != NULL) {
+			pixbuf = gdk_pixbuf_new_from_stream(stream, NULL, &error);
+			g_input_stream_close (stream, NULL, NULL);
+			g_object_unref (stream);
+
+			if (pixbuf != NULL) {
+				/* Scale icon if all we get is something too big. */
+				if (gdk_pixbuf_get_height(pixbuf) > ICON_SIZE) {
+					gfloat scale = (gfloat)ICON_SIZE / (gfloat)gdk_pixbuf_get_height(pixbuf);
+					gint width = round(gdk_pixbuf_get_width(pixbuf) * scale);
+
+					GdkPixbuf * scaled = gdk_pixbuf_scale_simple(pixbuf, width, ICON_SIZE, GDK_INTERP_BILINEAR);
+					g_object_unref(G_OBJECT(pixbuf));
+					pixbuf = scaled;
+				}
+
+				/* Put the pixbuf on the image */
+				gtk_image_set_from_pixbuf(image, pixbuf);
+				g_object_unref(G_OBJECT(pixbuf));
+			} else {
+				g_warning ("Unable to load icon from data: %s", error->message);
+				g_error_free (error);
+			}
+		} else {
+			g_warning ("Unable to load icon from data: %s", error->message);
+			g_error_free (error);
+		}
+	}
+
+	if (icon_info != NULL) {
+#if GTK_CHECK_VERSION(3, 8, 0)
+		g_object_unref(icon_info);
+#else
+		/* NOTE: Leaving this in for lower version as it seems
+		   the object_unref() doesn't work on earlier versions. */
+		gtk_icon_info_free (icon_info);
+#endif
+	}
+}
+
+/* Handles the theme changed signal to refresh the icon to make
+   sure that it changes appropriately */
+static void
+theme_changed_cb (__attribute__((unused)) GtkIconTheme * theme, gpointer user_data)
+{
+	GtkImage * image = GTK_IMAGE(user_data);
+	refresh_image(image);
+	return;
+}
+
+/* Removes the signal on the theme that was calling update on this
+   image. */
+static void
+image_destroyed_cb (GtkImage * image, __attribute__((unused)) gpointer user_data)
+{
+	g_signal_handlers_disconnect_by_func(gtk_icon_theme_get_default(), theme_changed_cb, image);
+	return;
+}
+
+/* Catch the style changing on the image to make sure
+   we've got the latest. */
+static void
+image_style_change_cb (GtkImage * image, __attribute__((unused)) GtkStyle * previous_style, __attribute__((unused)) gpointer user_data)
+{
+	refresh_image(image);
+	return;
+}
+
+/* Builds an image with the name and fallbacks and all kinds of fun
+   stuff . */
+GtkImage *
+indicator_image_helper (const gchar * name)
+{
+	/* Build us an image */
+	GtkImage * image = GTK_IMAGE(gtk_image_new());
+
+	if (name)
+		indicator_image_helper_update(image, name);
+
+	return image;
+}
+
+/* Updates and image with all the fun stuff */
+void
+indicator_image_helper_update (GtkImage * image, const gchar * name)
+{
+	g_return_if_fail(name != NULL);
+	g_return_if_fail(name[0] != '\0');
+	g_return_if_fail(GTK_IS_IMAGE(image));
+
+	/* Build us a GIcon */
+	GIcon * icon_names = g_themed_icon_new_with_default_fallbacks(name);
+	g_warn_if_fail(icon_names != NULL);
+	g_return_if_fail(icon_names != NULL);
+
+	indicator_image_helper_update_from_gicon (image, icon_names);
+
+	g_object_unref (icon_names);
+	return;
+}
+
+void
+indicator_image_helper_update_from_gicon (GtkImage *image, GIcon *icon)
+{
+	gboolean seen_previously = FALSE;
+
+	seen_previously = (g_object_get_data(G_OBJECT(image), INDICATOR_NAMES_DATA) != NULL);
+
+	/* Attach our names to the image */
+	g_object_set_data_full(G_OBJECT(image), INDICATOR_NAMES_DATA, g_object_ref (icon), g_object_unref);
+
+	/* Put the pixbuf in */
+	refresh_image(image);
+
+	/* Connect to all changes */
+	if (!seen_previously) {
+		g_signal_connect(G_OBJECT(gtk_icon_theme_get_default()), "changed", G_CALLBACK(theme_changed_cb), image);
+		g_signal_connect(G_OBJECT(image), "destroy", G_CALLBACK(image_destroyed_cb), NULL);
+		g_signal_connect(G_OBJECT(image), "style-set", G_CALLBACK(image_style_change_cb), NULL);
+	}
+
+	return;
+}