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Diffstat (limited to 'src/st/st-theme-context.c')
| -rw-r--r-- | src/st/st-theme-context.c | 492 |
1 files changed, 492 insertions, 0 deletions
diff --git a/src/st/st-theme-context.c b/src/st/st-theme-context.c new file mode 100644 index 0000000..4055786 --- /dev/null +++ b/src/st/st-theme-context.c @@ -0,0 +1,492 @@ +/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */ +/* + * st-theme-context.c: holds global information about a tree of styled objects + * + * Copyright 2009, 2010 Red Hat, Inc. + * Copyright 2009 Florian Müllner + * + * This program 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 program is distributed in the hope 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 program. If not, see <http://www.gnu.org/licenses/>. + */ + +#include <config.h> + +#include "st-private.h" +#include "st-settings.h" +#include "st-texture-cache.h" +#include "st-theme.h" +#include "st-theme-context.h" +#include "st-theme-node-private.h" + +struct _StThemeContext { + GObject parent; + + PangoFontDescription *font; + StThemeNode *root_node; + StTheme *theme; + + /* set of StThemeNode */ + GHashTable *nodes; + + gulong stylesheets_changed_id; + + int scale_factor; +}; + +enum +{ + PROP_0, + PROP_SCALE_FACTOR, + + N_PROPS +}; + +static GParamSpec *props[N_PROPS] = { NULL, }; + +enum +{ + CHANGED, + + LAST_SIGNAL +}; + +static guint signals[LAST_SIGNAL] = { 0, }; + +G_DEFINE_TYPE (StThemeContext, st_theme_context, G_TYPE_OBJECT) + +static PangoFontDescription *get_interface_font_description (void); +static void on_font_name_changed (StSettings *settings, + GParamSpec *pspec, + StThemeContext *context); +static void on_icon_theme_changed (StTextureCache *cache, + StThemeContext *context); +static void st_theme_context_changed (StThemeContext *context); + +static void st_theme_context_set_property (GObject *object, + guint prop_id, + const GValue *value, + GParamSpec *pspec); +static void st_theme_context_get_property (GObject *object, + guint prop_id, + GValue *value, + GParamSpec *pspec); + +static void +st_theme_context_set_scale_factor (StThemeContext *context, + int scale_factor) +{ + if (scale_factor == context->scale_factor) + return; + + context->scale_factor = scale_factor; + g_object_notify_by_pspec (G_OBJECT (context), props[PROP_SCALE_FACTOR]); + st_theme_context_changed (context); +} + + +static void +st_theme_context_finalize (GObject *object) +{ + StThemeContext *context = ST_THEME_CONTEXT (object); + + g_signal_handlers_disconnect_by_func (st_settings_get (), + (gpointer) on_font_name_changed, + context); + g_signal_handlers_disconnect_by_func (st_texture_cache_get_default (), + (gpointer) on_icon_theme_changed, + context); + g_signal_handlers_disconnect_by_func (clutter_get_default_backend (), + (gpointer) st_theme_context_changed, + context); + + g_clear_signal_handler (&context->stylesheets_changed_id, context->theme); + + if (context->nodes) + g_hash_table_unref (context->nodes); + if (context->root_node) + g_object_unref (context->root_node); + if (context->theme) + g_object_unref (context->theme); + + pango_font_description_free (context->font); + + G_OBJECT_CLASS (st_theme_context_parent_class)->finalize (object); +} + +static void +st_theme_context_class_init (StThemeContextClass *klass) +{ + GObjectClass *object_class = G_OBJECT_CLASS (klass); + + object_class->set_property = st_theme_context_set_property; + object_class->get_property = st_theme_context_get_property; + object_class->finalize = st_theme_context_finalize; + + /** + * StThemeContext:scale-factor: + * + * The scaling factor used for HiDPI scaling. + */ + props[PROP_SCALE_FACTOR] = + g_param_spec_int ("scale-factor", + "Scale factor", + "Integer scale factor used for HiDPI scaling", + 0, G_MAXINT, 1, + ST_PARAM_READWRITE | G_PARAM_EXPLICIT_NOTIFY); + + g_object_class_install_properties (object_class, N_PROPS, props); + + /** + * StThemeContext::changed: + * @self: a #StThemeContext + * + * Emitted when the icon theme, font, resolution, scale factor or the current + * theme's custom stylesheets change. + */ + signals[CHANGED] = + g_signal_new ("changed", + G_TYPE_FROM_CLASS (klass), + G_SIGNAL_RUN_LAST, + 0, /* no default handler slot */ + NULL, NULL, NULL, + G_TYPE_NONE, 0); +} + +static void +st_theme_context_init (StThemeContext *context) +{ + context->font = get_interface_font_description (); + + g_signal_connect (st_settings_get (), + "notify::font-name", + G_CALLBACK (on_font_name_changed), + context); + g_signal_connect (st_texture_cache_get_default (), + "icon-theme-changed", + G_CALLBACK (on_icon_theme_changed), + context); + g_signal_connect_swapped (clutter_get_default_backend (), + "resolution-changed", + G_CALLBACK (st_theme_context_changed), + context); + + context->nodes = g_hash_table_new_full ((GHashFunc) st_theme_node_hash, + (GEqualFunc) st_theme_node_equal, + g_object_unref, NULL); + context->scale_factor = 1; +} + +static void +st_theme_context_set_property (GObject *object, + guint prop_id, + const GValue *value, + GParamSpec *pspec) +{ + StThemeContext *context = ST_THEME_CONTEXT (object); + + switch (prop_id) + { + case PROP_SCALE_FACTOR: + st_theme_context_set_scale_factor (context, g_value_get_int (value)); + break; + default: + G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); + break; + } +} + +static void +st_theme_context_get_property (GObject *object, + guint prop_id, + GValue *value, + GParamSpec *pspec) +{ + StThemeContext *context = ST_THEME_CONTEXT (object); + + switch (prop_id) + { + case PROP_SCALE_FACTOR: + g_value_set_int (value, context->scale_factor); + break; + default: + G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); + break; + } +} + +/** + * st_theme_context_new: + * + * Create a new theme context not associated with any #ClutterStage. + * This can be useful in testing scenarios, or if using StThemeContext + * with something other than #ClutterActor objects, but you generally + * should use st_theme_context_get_for_stage() instead. + * + * Returns: (transfer full): a new #StThemeContext + */ +StThemeContext * +st_theme_context_new (void) +{ + StThemeContext *context; + + context = g_object_new (ST_TYPE_THEME_CONTEXT, NULL); + + return context; +} + +static PangoFontDescription * +get_interface_font_description (void) +{ + StSettings *settings = st_settings_get (); + g_autofree char *font_name = NULL; + + g_object_get (settings, "font-name", &font_name, NULL); + return pango_font_description_from_string (font_name); +} + +static void +on_stage_destroy (ClutterStage *stage) +{ + StThemeContext *context = st_theme_context_get_for_stage (stage); + + g_object_set_data (G_OBJECT (stage), "st-theme-context", NULL); + g_object_unref (context); +} + +static void +st_theme_context_changed (StThemeContext *context) +{ + StThemeNode *old_root = context->root_node; + context->root_node = NULL; + g_hash_table_remove_all (context->nodes); + + g_signal_emit (context, signals[CHANGED], 0); + + if (old_root) + g_object_unref (old_root); +} + +static void +on_font_name_changed (StSettings *settings, + GParamSpec *pspect, + StThemeContext *context) +{ + PangoFontDescription *font_desc = get_interface_font_description (); + st_theme_context_set_font (context, font_desc); + + pango_font_description_free (font_desc); +} + +static gboolean +changed_idle (gpointer userdata) +{ + st_theme_context_changed (userdata); + return FALSE; +} + +static void +on_icon_theme_changed (StTextureCache *cache, + StThemeContext *context) +{ + guint id; + + /* Note that an icon theme change isn't really a change of the StThemeContext; + * the style information has changed. But since the style factors into the + * icon_name => icon lookup, faking a theme context change is a good way + * to force users such as StIcon to look up icons again. + */ + id = g_idle_add ((GSourceFunc) changed_idle, context); + g_source_set_name_by_id (id, "[gnome-shell] changed_idle"); +} + +/** + * st_theme_context_get_for_stage: + * @stage: a #ClutterStage + * + * Gets a singleton theme context associated with the stage. + * + * Returns: (transfer none): the singleton theme context for the stage + */ +StThemeContext * +st_theme_context_get_for_stage (ClutterStage *stage) +{ + StThemeContext *context; + + g_return_val_if_fail (CLUTTER_IS_STAGE (stage), NULL); + + context = g_object_get_data (G_OBJECT (stage), "st-theme-context"); + if (context) + return context; + + context = st_theme_context_new (); + g_object_set_data (G_OBJECT (stage), "st-theme-context", context); + g_signal_connect (stage, "destroy", + G_CALLBACK (on_stage_destroy), NULL); + + return context; +} + +/** + * st_theme_context_set_theme: + * @context: a #StThemeContext + * @theme: a #StTheme + * + * Sets the default set of theme stylesheets for the context. This theme will + * be used for the root node and for nodes descending from it, unless some other + * style is explicitly specified. + */ +void +st_theme_context_set_theme (StThemeContext *context, + StTheme *theme) +{ + g_return_if_fail (ST_IS_THEME_CONTEXT (context)); + g_return_if_fail (theme == NULL || ST_IS_THEME (theme)); + + if (context->theme != theme) + { + if (context->theme) + g_clear_signal_handler (&context->stylesheets_changed_id, context->theme); + + g_set_object (&context->theme, theme); + + if (context->theme) + { + context->stylesheets_changed_id = + g_signal_connect_swapped (context->theme, + "custom-stylesheets-changed", + G_CALLBACK (st_theme_context_changed), + context); + } + + st_theme_context_changed (context); + } +} + +/** + * st_theme_context_get_theme: + * @context: a #StThemeContext + * + * Gets the default theme for the context. See st_theme_context_set_theme() + * + * Returns: (transfer none): the default theme for the context + */ +StTheme * +st_theme_context_get_theme (StThemeContext *context) +{ + g_return_val_if_fail (ST_IS_THEME_CONTEXT (context), NULL); + + return context->theme; +} + +/** + * st_theme_context_set_font: + * @context: a #StThemeContext + * @font: the default font for theme context + * + * Sets the default font for the theme context. This is the font that + * is inherited by the root node of the tree of theme nodes. If the + * font is not overridden, then this font will be used. If the font is + * partially modified (for example, with 'font-size: 110%'), then that + * modification is based on this font. + */ +void +st_theme_context_set_font (StThemeContext *context, + const PangoFontDescription *font) +{ + g_return_if_fail (ST_IS_THEME_CONTEXT (context)); + g_return_if_fail (font != NULL); + + if (context->font == font || + pango_font_description_equal (context->font, font)) + return; + + pango_font_description_free (context->font); + context->font = pango_font_description_copy (font); + st_theme_context_changed (context); +} + +/** + * st_theme_context_get_font: + * @context: a #StThemeContext + * + * Gets the default font for the theme context. See st_theme_context_set_font(). + * + * Returns: the default font for the theme context. + */ +const PangoFontDescription * +st_theme_context_get_font (StThemeContext *context) +{ + g_return_val_if_fail (ST_IS_THEME_CONTEXT (context), NULL); + + return context->font; +} + +/** + * st_theme_context_get_root_node: + * @context: a #StThemeContext + * + * Gets the root node of the tree of theme style nodes that associated with this + * context. For the node tree associated with a stage, this node represents + * styles applied to the stage itself. + * + * Returns: (transfer none): the root node of the context's style tree + */ +StThemeNode * +st_theme_context_get_root_node (StThemeContext *context) +{ + if (context->root_node == NULL) + context->root_node = st_theme_node_new (context, NULL, context->theme, + G_TYPE_NONE, NULL, NULL, NULL, NULL); + + return context->root_node; +} + +/** + * st_theme_context_intern_node: + * @context: a #StThemeContext + * @node: a #StThemeNode + * + * Return an existing node matching @node, or if that isn't possible, + * @node itself. + * + * Returns: (transfer none): a node with the same properties as @node + */ +StThemeNode * +st_theme_context_intern_node (StThemeContext *context, + StThemeNode *node) +{ + StThemeNode *mine = g_hash_table_lookup (context->nodes, node); + + /* this might be node or not - it doesn't actually matter */ + if (mine != NULL) + return mine; + + g_hash_table_add (context->nodes, g_object_ref (node)); + return node; +} + +/** + * st_theme_context_get_scale_factor: + * @context: a #StThemeContext + * + * Return the current scale factor of @context. + * + * Returns: an integer scale factor + */ +int +st_theme_context_get_scale_factor (StThemeContext *context) +{ + g_return_val_if_fail (ST_IS_THEME_CONTEXT (context), -1); + + return context->scale_factor; +} |