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Diffstat (limited to 'libindicator/indicator-image-helper.c')
| -rw-r--r-- | libindicator/indicator-image-helper.c | 143 |
1 files changed, 143 insertions, 0 deletions
diff --git a/libindicator/indicator-image-helper.c b/libindicator/indicator-image-helper.c new file mode 100644 index 0000000..cbbad3d --- /dev/null +++ b/libindicator/indicator-image-helper.c @@ -0,0 +1,143 @@ +/* +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"; + +static void +refresh_image (GtkImage * image) +{ + g_return_if_fail(GTK_IS_IMAGE(image)); + + GIcon * icon_names = (GIcon *)g_object_get_data(G_OBJECT(image), INDICATOR_NAMES_DATA); + g_return_if_fail(icon_names != NULL); + + /* Get the default theme */ + GtkIconTheme * default_theme = gtk_icon_theme_get_default(); + g_return_if_fail(default_theme != NULL); + + gint icon_size = 22; + + GtkStyle * style = gtk_widget_get_style(GTK_WIDGET(image)); + GValue styleprop = {0}; + gtk_style_get_style_property(style, GTK_TYPE_IMAGE, "x-ayatana-indicator-dynamic", &styleprop); + + if (G_VALUE_HOLDS_BOOLEAN(&styleprop) && g_value_get_boolean(&styleprop)) { + PangoContext * context = gtk_widget_get_pango_context(GTK_WIDGET(image)); + PangoFontMetrics * metrics = pango_context_get_metrics(context, style->font_desc, pango_context_get_language(context)); + icon_size = PANGO_PIXELS(pango_font_metrics_get_ascent(metrics)) + PANGO_PIXELS(pango_font_metrics_get_descent(metrics)); + g_debug("Looking for icon size %d", icon_size); + pango_font_metrics_unref(metrics); + } + + /* Look through the themes for that icon */ + GtkIconInfo * icon_info = gtk_icon_theme_lookup_by_gicon(default_theme, icon_names, icon_size, 0); + if (icon_info == NULL) { + g_warning("Unable to find icon in theme."); + return; + } + + /* Grab the filename */ + const gchar * icon_filename = gtk_icon_info_get_filename(icon_info); + g_return_if_fail(icon_filename != NULL); /* An error because we shouldn't get info without a filename */ + + /* Build a pixbuf */ + GError * error = NULL; + GdkPixbuf * pixbuf = gdk_pixbuf_new_from_file(icon_filename, &error); + gtk_icon_info_free(icon_info); + + if (pixbuf == NULL) { + g_error("Unable to load icon from file '%s' because: %s", icon_filename, error == NULL ? "I don't know" : error->message); + return; + } + + /* 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)); + + return; +} + +/* Handles the theme changed signal to refresh the icon to make + sure that it changes appropriately */ +static void +theme_changed_cb (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, gpointer user_data) +{ + g_signal_handlers_disconnect_by_func(gtk_icon_theme_get_default(), theme_changed_cb, image); + return; +} + +GtkImage * +indicator_image_helper (const gchar * name) +{ + g_return_val_if_fail(name != NULL, NULL); + g_return_val_if_fail(name[0] != '\0', NULL); + + /* Build us a GIcon */ + GIcon * icon_names = g_themed_icon_new_with_default_fallbacks(name); + g_return_val_if_fail(icon_names != NULL, NULL); + + /* Build us an image */ + GtkImage * image = GTK_IMAGE(gtk_image_new()); + + if (image == NULL) { + g_error("Unable to create image from pixbuf on icon name '%s'", name); + g_object_unref(icon_names); + return NULL; + } + + /* Attach our names to the image */ + g_object_set_data_full(G_OBJECT(image), INDICATOR_NAMES_DATA, icon_names, g_object_unref); + + /* Put the pixbuf in */ + refresh_image(image); + + /* Connect to all changes */ + 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); + + /* Return our built image */ + return image; +} |