/* dzl-theme-manager.c
*
* Copyright (C) 2015 Christian Hergert <chergert@redhat.com>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program 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 for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#define G_LOG_DOMAIN "dzl-theme-manager"
#include "config.h"
#include <string.h>
#include "theming/dzl-css-provider.h"
#include "theming/dzl-theme-manager.h"
struct _DzlThemeManager
{
GObject parent_instance;
GHashTable *providers_by_path;
};
G_DEFINE_TYPE (DzlThemeManager, dzl_theme_manager, G_TYPE_OBJECT)
static void
dzl_theme_manager_finalize (GObject *object)
{
DzlThemeManager *self = (DzlThemeManager *)object;
g_clear_pointer (&self->providers_by_path, g_hash_table_unref);
G_OBJECT_CLASS (dzl_theme_manager_parent_class)->finalize (object);
}
static void
dzl_theme_manager_class_init (DzlThemeManagerClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
object_class->finalize = dzl_theme_manager_finalize;
}
static void
dzl_theme_manager_init (DzlThemeManager *self)
{
self->providers_by_path = g_hash_table_new_full (g_str_hash,
g_str_equal,
g_free,
g_object_unref);
}
DzlThemeManager *
dzl_theme_manager_new (void)
{
return g_object_new (DZL_TYPE_THEME_MANAGER, NULL);
}
static gboolean
has_child_resources (const gchar *path)
{
g_auto(GStrv) children = NULL;
if (g_str_has_prefix (path, "resource://"))
path += strlen ("resource://");
children = g_resources_enumerate_children (path, 0, NULL);
return children != NULL && children[0] != NULL;
}
/**
* dzl_theme_manager_add_resources:
* @self: a #DzlThemeManager
* @resource_path: A path to a #GResources directory
*
* This will automatically register resources found within @resource_path.
*
* If @resource_path starts with "resource://", embedded #GResources will be
* used to locate the theme files. Otherwise, @resource_path is expected to be
* a path on disk that may or may not exist.
*
* If the @resource_path contains a directory named "themes", that directory
* will be traversed for files matching the theme name and variant. For
* example, if using the Adwaita theme, "themes/Adwaita.css" will be loaded. If
* the dark variant is being used, "themes/Adwaita-dark.css" will be loaeded. If
* no matching theme file is located, "themes/shared.css" will be loaded.
*
* When the current theme changes, the CSS will be reloaded to adapt.
*
* The "icons" sub-directory will be used to locate icon themes.
*/
void
dzl_theme_manager_add_resources (DzlThemeManager *self,
const gchar *resource_path)
{
g_autoptr(GtkCssProvider) provider = NULL;
g_autofree gchar *css_dir = NULL;
g_autofree gchar *icons_dir = NULL;
const gchar *real_path = resource_path;
GtkIconTheme *theme;
g_return_if_fail (DZL_IS_THEME_MANAGER (self));
g_return_if_fail (resource_path != NULL);
theme = gtk_icon_theme_get_default ();
if (g_str_has_prefix (real_path, "resource://"))
real_path += strlen ("resource://");
/*
* Create a CSS provider that will load the proper variant based on the
* current application theme, using @resource_path/css as the base directory
* to locate theming files.
*/
css_dir = g_build_path ("/", resource_path, "themes/", NULL);
g_debug ("Including CSS overrides from %s", css_dir);
if (has_child_resources (css_dir))
{
provider = dzl_css_provider_new (css_dir);
g_hash_table_insert (self->providers_by_path, g_strdup (resource_path), g_object_ref (provider));
gtk_style_context_add_provider_for_screen (gdk_screen_get_default (),
GTK_STYLE_PROVIDER (provider),
GTK_STYLE_PROVIDER_PRIORITY_APPLICATION);
}
/*
* Add the icons sub-directory so that Gtk can locate the themed
* icons (svg, png, etc).
*/
icons_dir = g_build_path ("/", real_path, "icons/", NULL);
g_debug ("Loading icon resources from %s", icons_dir);
if (!g_str_equal (real_path, resource_path))
{
g_auto(GStrv) children = NULL;
/* Okay, this is a resource-based path. Make sure the
* path contains children so we don't slow down the
* theme loading code with tons of useless directories.
*/
children = g_resources_enumerate_children (icons_dir, 0, NULL);
if (children != NULL && children[0] != NULL)
gtk_icon_theme_add_resource_path (theme, icons_dir);
}
else
{
/* Make sure the directory exists so that we don't needlessly
* slow down the icon loading paths.
*/
if (g_file_test (icons_dir, G_FILE_TEST_IS_DIR))
gtk_icon_theme_append_search_path (theme, icons_dir);
}
}
/**
* dzl_theme_manager_remove_resources:
* @self: a #DzlThemeManager
* @resource_path: A previously registered resources path
*
* This removes the CSS providers that were registered using @resource_path.
*
* You must have previously called dzl_theme_manager_add_resources() for
* this function to do anything.
*
* Since icons cannot be unloaded, previously loaded icons will continue to
* be available even after calling this function.
*/
void
dzl_theme_manager_remove_resources (DzlThemeManager *self,
const gchar *resource_path)
{
GtkStyleProvider *provider;
g_return_if_fail (DZL_IS_THEME_MANAGER (self));
g_return_if_fail (resource_path != NULL);
g_return_if_fail (g_hash_table_contains (self->providers_by_path, resource_path));
if (NULL != (provider = g_hash_table_lookup (self->providers_by_path, resource_path)))
{
g_debug ("Removing CSS overrides from %s", resource_path);
gtk_style_context_remove_provider_for_screen (gdk_screen_get_default (), provider);
g_hash_table_remove (self->providers_by_path, resource_path);
}
}