/* GTK - The GIMP Toolkit * Copyright (C) 2010 Carlos Garnacho * * 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 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 . */ #include "config.h" #include "gtkstylecontextprivate.h" #include #include #include #include #include "gtkcsscolorvalueprivate.h" #include "gtkcssenumvalueprivate.h" #include "gtkcssimagevalueprivate.h" #include "gtkcssnodedeclarationprivate.h" #include "gtkcssnodeprivate.h" #include "gtkcssnumbervalueprivate.h" #include "gtkcsscolorvalueprivate.h" #include "gtkcsscolorvalueprivate.h" #include "gtkcssstylepropertyprivate.h" #include "gtkcsstransientnodeprivate.h" #include "gtkcsswidgetnodeprivate.h" #include "gtkdebug.h" #include "gtkintl.h" #include "gtkprivate.h" #include "gtkrenderbackgroundprivate.h" #include "gtkrendericonprivate.h" #include "gtksettings.h" #include "gtksettingsprivate.h" #include "gtkstylecascadeprivate.h" #include "gtkstyleproviderprivate.h" #include "gtktypebuiltins.h" #include "gtkwidgetprivate.h" /** * SECTION:gtkstylecontext * @Short_description: Rendering UI elements * @Title: GtkStyleContext * * #GtkStyleContext is an object that stores styling information affecting * a widget. * * In order to construct the final style information, #GtkStyleContext * queries information from all attached #GtkStyleProviders. Style providers * can be either attached explicitly to the context through * gtk_style_context_add_provider(), or to the display through * gtk_style_context_add_provider_for_display(). The resulting style is a * combination of all providers’ information in priority order. * * For GTK+ widgets, any #GtkStyleContext returned by * gtk_widget_get_style_context() will already have a #GdkDisplay and * RTL/LTR information set. The style context will also be updated * automatically if any of these settings change on the widget. * * # Style Classes # {#gtkstylecontext-classes} * * Widgets can add style classes to their context, which can be used to associate * different styles by class. The documentation for individual widgets lists * which style classes it uses itself, and which style classes may be added by * applications to affect their appearance. * * GTK+ defines macros for a number of style classes. * * # Custom styling in UI libraries and applications * * If you are developing a library with custom #GtkWidgets that * render differently than standard components, you may need to add a * #GtkStyleProvider yourself with the %GTK_STYLE_PROVIDER_PRIORITY_FALLBACK * priority, either a #GtkCssProvider or a custom object implementing the * #GtkStyleProvider interface. This way themes may still attempt * to style your UI elements in a different way if needed so. * * If you are using custom styling on an applications, you probably want then * to make your style information prevail to the theme’s, so you must use * a #GtkStyleProvider with the %GTK_STYLE_PROVIDER_PRIORITY_APPLICATION * priority, keep in mind that the user settings in * `XDG_CONFIG_HOME/gtk-4.0/gtk.css` will * still take precedence over your changes, as it uses the * %GTK_STYLE_PROVIDER_PRIORITY_USER priority. */ #define CURSOR_ASPECT_RATIO (0.04) struct _GtkStyleContextPrivate { GdkDisplay *display; guint cascade_changed_id; GtkStyleCascade *cascade; GtkCssNode *cssnode; GSList *saved_nodes; }; typedef struct _GtkStyleContextPrivate GtkStyleContextPrivate; enum { PROP_0, PROP_DISPLAY, LAST_PROP }; static GParamSpec *properties[LAST_PROP] = { NULL, }; static void gtk_style_context_finalize (GObject *object); static void gtk_style_context_impl_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec); static void gtk_style_context_impl_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec); static GtkCssNode * gtk_style_context_get_root (GtkStyleContext *context); G_DEFINE_TYPE_WITH_PRIVATE (GtkStyleContext, gtk_style_context, G_TYPE_OBJECT) static void gtk_style_context_class_init (GtkStyleContextClass *klass) { GObjectClass *object_class = G_OBJECT_CLASS (klass); object_class->finalize = gtk_style_context_finalize; object_class->set_property = gtk_style_context_impl_set_property; object_class->get_property = gtk_style_context_impl_get_property; properties[PROP_DISPLAY] = g_param_spec_object ("display", P_("Display"), P_("The associated GdkDisplay"), GDK_TYPE_DISPLAY, GTK_PARAM_READWRITE); g_object_class_install_properties (object_class, LAST_PROP, properties); } static void gtk_style_context_pop_style_node (GtkStyleContext *context) { GtkStyleContextPrivate *priv = gtk_style_context_get_instance_private (context); g_return_if_fail (priv->saved_nodes != NULL); if (GTK_IS_CSS_TRANSIENT_NODE (priv->cssnode)) gtk_css_node_set_parent (priv->cssnode, NULL); g_object_unref (priv->cssnode); priv->cssnode = priv->saved_nodes->data; priv->saved_nodes = g_slist_remove (priv->saved_nodes, priv->cssnode); } static void gtk_style_context_cascade_changed (GtkStyleCascade *cascade, GtkStyleContext *context) { gtk_css_node_invalidate_style_provider (gtk_style_context_get_root (context)); } static void gtk_style_context_set_cascade (GtkStyleContext *context, GtkStyleCascade *cascade) { GtkStyleContextPrivate *priv = gtk_style_context_get_instance_private (context); if (priv->cascade == cascade) return; if (priv->cascade) { g_signal_handler_disconnect (priv->cascade, priv->cascade_changed_id); priv->cascade_changed_id = 0; g_object_unref (priv->cascade); } if (cascade) { g_object_ref (cascade); priv->cascade_changed_id = g_signal_connect (cascade, "gtk-private-changed", G_CALLBACK (gtk_style_context_cascade_changed), context); } priv->cascade = cascade; if (cascade && priv->cssnode != NULL) gtk_style_context_cascade_changed (cascade, context); } static void gtk_style_context_init (GtkStyleContext *context) { GtkStyleContextPrivate *priv = gtk_style_context_get_instance_private (context); priv->display = gdk_display_get_default (); if (priv->display == NULL) g_error ("Can't create a GtkStyleContext without a display connection"); gtk_style_context_set_cascade (context, _gtk_settings_get_style_cascade (gtk_settings_get_for_display (priv->display), 1)); } static void gtk_style_context_finalize (GObject *object) { GtkStyleContext *context = GTK_STYLE_CONTEXT (object); GtkStyleContextPrivate *priv = gtk_style_context_get_instance_private (context); while (priv->saved_nodes) gtk_style_context_pop_style_node (context); gtk_style_context_set_cascade (context, NULL); if (priv->cssnode) g_object_unref (priv->cssnode); G_OBJECT_CLASS (gtk_style_context_parent_class)->finalize (object); } static void gtk_style_context_impl_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec) { GtkStyleContext *context = GTK_STYLE_CONTEXT (object); switch (prop_id) { case PROP_DISPLAY: gtk_style_context_set_display (context, g_value_get_object (value)); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } } static void gtk_style_context_impl_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec) { GtkStyleContext *context = GTK_STYLE_CONTEXT (object); GtkStyleContextPrivate *priv = gtk_style_context_get_instance_private (context); switch (prop_id) { case PROP_DISPLAY: g_value_set_object (value, priv->display); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } } /* returns TRUE if someone called gtk_style_context_save() but hasn’t * called gtk_style_context_restore() yet. * In those situations we don’t invalidate the context when somebody * changes state/classes. */ static gboolean gtk_style_context_is_saved (GtkStyleContext *context) { GtkStyleContextPrivate *priv = gtk_style_context_get_instance_private (context); return priv->saved_nodes != NULL; } static GtkCssNode * gtk_style_context_get_root (GtkStyleContext *context) { GtkStyleContextPrivate *priv = gtk_style_context_get_instance_private (context); if (priv->saved_nodes != NULL) return g_slist_last (priv->saved_nodes)->data; else return priv->cssnode; } GtkStyleProvider * gtk_style_context_get_style_provider (GtkStyleContext *context) { GtkStyleContextPrivate *priv = gtk_style_context_get_instance_private (context); return GTK_STYLE_PROVIDER (priv->cascade); } static gboolean gtk_style_context_has_custom_cascade (GtkStyleContext *context) { GtkStyleContextPrivate *priv = gtk_style_context_get_instance_private (context); GtkSettings *settings = gtk_settings_get_for_display (priv->display); return priv->cascade != _gtk_settings_get_style_cascade (settings, _gtk_style_cascade_get_scale (priv->cascade)); } GtkCssStyle * gtk_style_context_lookup_style (GtkStyleContext *context) { GtkStyleContextPrivate *priv = gtk_style_context_get_instance_private (context); /* Code will recreate style if it was changed */ return gtk_css_node_get_style (priv->cssnode); } GtkCssNode* gtk_style_context_get_node (GtkStyleContext *context) { GtkStyleContextPrivate *priv = gtk_style_context_get_instance_private (context); return priv->cssnode; } GtkStyleContext * gtk_style_context_new_for_node (GtkCssNode *node) { GtkStyleContext *context; GtkStyleContextPrivate *priv; g_return_val_if_fail (GTK_IS_CSS_NODE (node), NULL); context = g_object_new (GTK_TYPE_STYLE_CONTEXT, NULL); priv = gtk_style_context_get_instance_private (context); priv->cssnode = g_object_ref (node); return context; } /** * gtk_style_context_add_provider: * @context: a #GtkStyleContext * @provider: a #GtkStyleProvider * @priority: the priority of the style provider. The lower * it is, the earlier it will be used in the style * construction. Typically this will be in the range * between %GTK_STYLE_PROVIDER_PRIORITY_FALLBACK and * %GTK_STYLE_PROVIDER_PRIORITY_USER * * Adds a style provider to @context, to be used in style construction. * Note that a style provider added by this function only affects * the style of the widget to which @context belongs. If you want * to affect the style of all widgets, use * gtk_style_context_add_provider_for_display(). * * Note: If both priorities are the same, a #GtkStyleProvider * added through this function takes precedence over another added * through gtk_style_context_add_provider_for_display(). **/ void gtk_style_context_add_provider (GtkStyleContext *context, GtkStyleProvider *provider, guint priority) { GtkStyleContextPrivate *priv = gtk_style_context_get_instance_private (context); g_return_if_fail (GTK_IS_STYLE_CONTEXT (context)); g_return_if_fail (GTK_IS_STYLE_PROVIDER (provider)); if (!gtk_style_context_has_custom_cascade (context)) { GtkStyleCascade *new_cascade; new_cascade = _gtk_style_cascade_new (); _gtk_style_cascade_set_scale (new_cascade, _gtk_style_cascade_get_scale (priv->cascade)); _gtk_style_cascade_set_parent (new_cascade, _gtk_settings_get_style_cascade (gtk_settings_get_for_display (priv->display), 1)); _gtk_style_cascade_add_provider (new_cascade, provider, priority); gtk_style_context_set_cascade (context, new_cascade); g_object_unref (new_cascade); } else { _gtk_style_cascade_add_provider (priv->cascade, provider, priority); } } /** * gtk_style_context_remove_provider: * @context: a #GtkStyleContext * @provider: a #GtkStyleProvider * * Removes @provider from the style providers list in @context. **/ void gtk_style_context_remove_provider (GtkStyleContext *context, GtkStyleProvider *provider) { GtkStyleContextPrivate *priv = gtk_style_context_get_instance_private (context); g_return_if_fail (GTK_IS_STYLE_CONTEXT (context)); g_return_if_fail (GTK_IS_STYLE_PROVIDER (provider)); if (!gtk_style_context_has_custom_cascade (context)) return; _gtk_style_cascade_remove_provider (priv->cascade, provider); } /** * gtk_style_context_add_provider_for_display: * @display: a #GdkDisplay * @provider: a #GtkStyleProvider * @priority: the priority of the style provider. The lower * it is, the earlier it will be used in the style * construction. Typically this will be in the range * between %GTK_STYLE_PROVIDER_PRIORITY_FALLBACK and * %GTK_STYLE_PROVIDER_PRIORITY_USER * * Adds a global style provider to @display, which will be used * in style construction for all #GtkStyleContexts under @display. * * GTK+ uses this to make styling information from #GtkSettings * available. * * Note: If both priorities are the same, A #GtkStyleProvider * added through gtk_style_context_add_provider() takes precedence * over another added through this function. **/ void gtk_style_context_add_provider_for_display (GdkDisplay *display, GtkStyleProvider *provider, guint priority) { GtkStyleCascade *cascade; g_return_if_fail (GDK_IS_DISPLAY (display)); g_return_if_fail (GTK_IS_STYLE_PROVIDER (provider)); g_return_if_fail (!GTK_IS_SETTINGS (provider) || _gtk_settings_get_display (GTK_SETTINGS (provider)) == display); cascade = _gtk_settings_get_style_cascade (gtk_settings_get_for_display (display), 1); _gtk_style_cascade_add_provider (cascade, provider, priority); } /** * gtk_style_context_remove_provider_for_display: * @display: a #GdkDisplay * @provider: a #GtkStyleProvider * * Removes @provider from the global style providers list in @display. **/ void gtk_style_context_remove_provider_for_display (GdkDisplay *display, GtkStyleProvider *provider) { GtkStyleCascade *cascade; g_return_if_fail (GDK_IS_DISPLAY (display)); g_return_if_fail (GTK_IS_STYLE_PROVIDER (provider)); g_return_if_fail (!GTK_IS_SETTINGS (provider)); cascade = _gtk_settings_get_style_cascade (gtk_settings_get_for_display (display), 1); _gtk_style_cascade_remove_provider (cascade, provider); } /* * gtk_style_context_set_id: * @context: a #GtkStyleContext * @id: (allow-none): the id to use or %NULL for none. * * Sets the CSS ID to be used when obtaining style information. **/ void gtk_style_context_set_id (GtkStyleContext *context, const char *id) { GtkStyleContextPrivate *priv = gtk_style_context_get_instance_private (context); g_return_if_fail (GTK_IS_STYLE_CONTEXT (context)); gtk_css_node_set_id (priv->cssnode, g_quark_from_string (id)); } /* * gtk_style_context_get_id: * @context: a #GtkStyleContext * * Returns the CSS ID used when obtaining style information. * * Returns: (nullable): the ID or %NULL if no ID is set. **/ const char * gtk_style_context_get_id (GtkStyleContext *context) { GtkStyleContextPrivate *priv = gtk_style_context_get_instance_private (context); g_return_val_if_fail (GTK_IS_STYLE_CONTEXT (context), NULL); return g_quark_to_string (gtk_css_node_get_id (priv->cssnode)); } /** * gtk_style_context_set_state: * @context: a #GtkStyleContext * @flags: state to represent * * Sets the state to be used for style matching. **/ void gtk_style_context_set_state (GtkStyleContext *context, GtkStateFlags flags) { GtkStyleContextPrivate *priv = gtk_style_context_get_instance_private (context); g_return_if_fail (GTK_IS_STYLE_CONTEXT (context)); gtk_css_node_set_state (priv->cssnode, flags); } /** * gtk_style_context_get_state: * @context: a #GtkStyleContext * * Returns the state used for style matching. * * This method should only be used to retrieve the #GtkStateFlags * to pass to #GtkStyleContext methods, like gtk_style_context_get_padding(). * If you need to retrieve the current state of a #GtkWidget, use * gtk_widget_get_state_flags(). * * Returns: the state flags **/ GtkStateFlags gtk_style_context_get_state (GtkStyleContext *context) { GtkStyleContextPrivate *priv = gtk_style_context_get_instance_private (context); g_return_val_if_fail (GTK_IS_STYLE_CONTEXT (context), 0); return gtk_css_node_get_state (priv->cssnode); } /** * gtk_style_context_set_scale: * @context: a #GtkStyleContext * @scale: scale * * Sets the scale to use when getting image assets for the style. **/ void gtk_style_context_set_scale (GtkStyleContext *context, gint scale) { GtkStyleContextPrivate *priv = gtk_style_context_get_instance_private (context); g_return_if_fail (GTK_IS_STYLE_CONTEXT (context)); if (scale == _gtk_style_cascade_get_scale (priv->cascade)) return; if (gtk_style_context_has_custom_cascade (context)) { _gtk_style_cascade_set_scale (priv->cascade, scale); } else { GtkStyleCascade *new_cascade; new_cascade = _gtk_settings_get_style_cascade (gtk_settings_get_for_display (priv->display), scale); gtk_style_context_set_cascade (context, new_cascade); } } /** * gtk_style_context_get_scale: * @context: a #GtkStyleContext * * Returns the scale used for assets. * * Returns: the scale **/ gint gtk_style_context_get_scale (GtkStyleContext *context) { GtkStyleContextPrivate *priv = gtk_style_context_get_instance_private (context); g_return_val_if_fail (GTK_IS_STYLE_CONTEXT (context), 0); return _gtk_style_cascade_get_scale (priv->cascade); } /* * gtk_style_context_save_to_node: * @context: a #GtkStyleContext * @node: the node to save to * * Saves the @context state, so temporary modifications done through * gtk_style_context_add_class(), gtk_style_context_remove_class(), * gtk_style_context_set_state(), etc. and rendering using * gtk_render_background() or similar functions are done using the * given @node. * * To undo, call gtk_style_context_restore(). * * The matching call to gtk_style_context_restore() must be done * before GTK returns to the main loop. **/ void gtk_style_context_save_to_node (GtkStyleContext *context, GtkCssNode *node) { GtkStyleContextPrivate *priv = gtk_style_context_get_instance_private (context); g_return_if_fail (GTK_IS_STYLE_CONTEXT (context)); g_return_if_fail (GTK_IS_CSS_NODE (node)); priv->saved_nodes = g_slist_prepend (priv->saved_nodes, priv->cssnode); priv->cssnode = g_object_ref (node); } void gtk_style_context_save_named (GtkStyleContext *context, const char *name) { GtkStyleContextPrivate *priv = gtk_style_context_get_instance_private (context); GtkCssNode *cssnode; /* Make sure we have the style existing. It is the * parent of the new saved node after all. */ if (!gtk_style_context_is_saved (context)) gtk_style_context_lookup_style (context); cssnode = gtk_css_transient_node_new (priv->cssnode); gtk_css_node_set_parent (cssnode, gtk_style_context_get_root (context)); if (name) gtk_css_node_set_name (cssnode, g_quark_from_string (name)); gtk_style_context_save_to_node (context, cssnode); g_object_unref (cssnode); } /** * gtk_style_context_save: * @context: a #GtkStyleContext * * Saves the @context state, so temporary modifications done through * gtk_style_context_add_class(), gtk_style_context_remove_class(), * gtk_style_context_set_state(), etc. can quickly be reverted * in one go through gtk_style_context_restore(). * * The matching call to gtk_style_context_restore() must be done * before GTK returns to the main loop. **/ void gtk_style_context_save (GtkStyleContext *context) { g_return_if_fail (GTK_IS_STYLE_CONTEXT (context)); gtk_style_context_save_named (context, NULL); } /** * gtk_style_context_restore: * @context: a #GtkStyleContext * * Restores @context state to a previous stage. * See gtk_style_context_save(). **/ void gtk_style_context_restore (GtkStyleContext *context) { GtkStyleContextPrivate *priv = gtk_style_context_get_instance_private (context); g_return_if_fail (GTK_IS_STYLE_CONTEXT (context)); if (priv->saved_nodes == NULL) { g_warning ("Unpaired gtk_style_context_restore() call"); return; } gtk_style_context_pop_style_node (context); } /** * gtk_style_context_add_class: * @context: a #GtkStyleContext * @class_name: class name to use in styling * * Adds a style class to @context, so posterior calls to * gtk_style_context_get() or any of the gtk_render_*() * functions will make use of this new class for styling. * * In the CSS file format, a #GtkEntry defining a “search” * class, would be matched by: * * |[ * entry.search { ... } * ]| * * While any widget defining a “search” class would be * matched by: * |[ * .search { ... } * ]| **/ void gtk_style_context_add_class (GtkStyleContext *context, const gchar *class_name) { GtkStyleContextPrivate *priv = gtk_style_context_get_instance_private (context); GQuark class_quark; g_return_if_fail (GTK_IS_STYLE_CONTEXT (context)); g_return_if_fail (class_name != NULL); class_quark = g_quark_from_string (class_name); gtk_css_node_add_class (priv->cssnode, class_quark); } /** * gtk_style_context_remove_class: * @context: a #GtkStyleContext * @class_name: class name to remove * * Removes @class_name from @context. **/ void gtk_style_context_remove_class (GtkStyleContext *context, const gchar *class_name) { GtkStyleContextPrivate *priv = gtk_style_context_get_instance_private (context); GQuark class_quark; g_return_if_fail (GTK_IS_STYLE_CONTEXT (context)); g_return_if_fail (class_name != NULL); class_quark = g_quark_try_string (class_name); if (!class_quark) return; gtk_css_node_remove_class (priv->cssnode, class_quark); } /** * gtk_style_context_has_class: * @context: a #GtkStyleContext * @class_name: a class name * * Returns %TRUE if @context currently has defined the * given class name. * * Returns: %TRUE if @context has @class_name defined **/ gboolean gtk_style_context_has_class (GtkStyleContext *context, const gchar *class_name) { GtkStyleContextPrivate *priv = gtk_style_context_get_instance_private (context); GQuark class_quark; g_return_val_if_fail (GTK_IS_STYLE_CONTEXT (context), FALSE); g_return_val_if_fail (class_name != NULL, FALSE); class_quark = g_quark_try_string (class_name); if (!class_quark) return FALSE; return gtk_css_node_has_class (priv->cssnode, class_quark); } GtkCssValue * _gtk_style_context_peek_property (GtkStyleContext *context, guint property_id) { GtkCssStyle *values = gtk_style_context_lookup_style (context); return gtk_css_style_get_value (values, property_id); } /** * gtk_style_context_set_display: * @context: a #GtkStyleContext * @display: a #GdkDisplay * * Attaches @context to the given display. * * The display is used to add style information from “global” style * providers, such as the display's #GtkSettings instance. * * If you are using a #GtkStyleContext returned from * gtk_widget_get_style_context(), you do not need to * call this yourself. **/ void gtk_style_context_set_display (GtkStyleContext *context, GdkDisplay *display) { GtkStyleContextPrivate *priv = gtk_style_context_get_instance_private (context); GtkStyleCascade *display_cascade; g_return_if_fail (GTK_IS_STYLE_CONTEXT (context)); g_return_if_fail (GDK_IS_DISPLAY (display)); if (priv->display == display) return; if (gtk_style_context_has_custom_cascade (context)) { display_cascade = _gtk_settings_get_style_cascade (gtk_settings_get_for_display (display), 1); _gtk_style_cascade_set_parent (priv->cascade, display_cascade); } else { display_cascade = _gtk_settings_get_style_cascade (gtk_settings_get_for_display (display), _gtk_style_cascade_get_scale (priv->cascade)); gtk_style_context_set_cascade (context, display_cascade); } priv->display = display; g_object_notify_by_pspec (G_OBJECT (context), properties[PROP_DISPLAY]); } /** * gtk_style_context_get_display: * @context: a #GtkStyleContext * * Returns the #GdkDisplay to which @context is attached. * * Returns: (transfer none): a #GdkDisplay. **/ GdkDisplay * gtk_style_context_get_display (GtkStyleContext *context) { GtkStyleContextPrivate *priv = gtk_style_context_get_instance_private (context); g_return_val_if_fail (GTK_IS_STYLE_CONTEXT (context), NULL); return priv->display; } static gboolean gtk_style_context_resolve_color (GtkStyleContext *context, GtkCssValue *color, GdkRGBA *result) { GtkStyleContextPrivate *priv = gtk_style_context_get_instance_private (context); GtkCssValue *val; g_return_val_if_fail (GTK_IS_STYLE_CONTEXT (context), FALSE); g_return_val_if_fail (color != NULL, FALSE); g_return_val_if_fail (result != NULL, FALSE); val = _gtk_css_color_value_resolve (color, GTK_STYLE_PROVIDER (priv->cascade), _gtk_style_context_peek_property (context, GTK_CSS_PROPERTY_COLOR), NULL); if (val == NULL) return FALSE; *result = *gtk_css_color_value_get_rgba (val); _gtk_css_value_unref (val); return TRUE; } /** * gtk_style_context_lookup_color: * @context: a #GtkStyleContext * @color_name: color name to lookup * @color: (out): Return location for the looked up color * * Looks up and resolves a color name in the @context color map. * * Returns: %TRUE if @color_name was found and resolved, %FALSE otherwise **/ gboolean gtk_style_context_lookup_color (GtkStyleContext *context, const gchar *color_name, GdkRGBA *color) { GtkStyleContextPrivate *priv = gtk_style_context_get_instance_private (context); GtkCssValue *value; g_return_val_if_fail (GTK_IS_STYLE_CONTEXT (context), FALSE); g_return_val_if_fail (color_name != NULL, FALSE); g_return_val_if_fail (color != NULL, FALSE); value = gtk_style_provider_get_color (GTK_STYLE_PROVIDER (priv->cascade), color_name); if (value == NULL) return FALSE; return gtk_style_context_resolve_color (context, value, color); } /** * gtk_style_context_get_color: * @context: a #GtkStyleContext * @color: (out): return value for the foreground color * * Gets the foreground color for a given state. * * See gtk_style_context_get_property() and * #GTK_STYLE_PROPERTY_COLOR for details. **/ void gtk_style_context_get_color (GtkStyleContext *context, GdkRGBA *color) { g_return_if_fail (color != NULL); g_return_if_fail (GTK_IS_STYLE_CONTEXT (context)); *color = *gtk_css_color_value_get_rgba (_gtk_style_context_peek_property (context, GTK_CSS_PROPERTY_COLOR)); } /** * gtk_style_context_get_border: * @context: a #GtkStyleContext * @border: (out): return value for the border settings * * Gets the border for a given state as a #GtkBorder. * * See gtk_style_context_get_property() and * #GTK_STYLE_PROPERTY_BORDER_WIDTH for details. **/ void gtk_style_context_get_border (GtkStyleContext *context, GtkBorder *border) { GtkCssStyle *style; g_return_if_fail (border != NULL); g_return_if_fail (GTK_IS_STYLE_CONTEXT (context)); style = gtk_style_context_lookup_style (context); border->top = round (_gtk_css_number_value_get (style->border->border_top_width, 100)); border->right = round (_gtk_css_number_value_get (style->border->border_right_width, 100)); border->bottom = round (_gtk_css_number_value_get (style->border->border_bottom_width, 100)); border->left = round (_gtk_css_number_value_get (style->border->border_left_width, 100)); } /** * gtk_style_context_get_padding: * @context: a #GtkStyleContext * @padding: (out): return value for the padding settings * * Gets the padding for a given state as a #GtkBorder. * See gtk_style_context_get() and #GTK_STYLE_PROPERTY_PADDING * for details. **/ void gtk_style_context_get_padding (GtkStyleContext *context, GtkBorder *padding) { GtkCssStyle *style; g_return_if_fail (padding != NULL); g_return_if_fail (GTK_IS_STYLE_CONTEXT (context)); style = gtk_style_context_lookup_style (context); padding->top = round (_gtk_css_number_value_get (style->size->padding_top, 100)); padding->right = round (_gtk_css_number_value_get (style->size->padding_right, 100)); padding->bottom = round (_gtk_css_number_value_get (style->size->padding_bottom, 100)); padding->left = round (_gtk_css_number_value_get (style->size->padding_left, 100)); } /** * gtk_style_context_get_margin: * @context: a #GtkStyleContext * @margin: (out): return value for the margin settings * * Gets the margin for a given state as a #GtkBorder. * See gtk_style_property_get() and #GTK_STYLE_PROPERTY_MARGIN * for details. **/ void gtk_style_context_get_margin (GtkStyleContext *context, GtkBorder *margin) { GtkCssStyle *style; g_return_if_fail (margin != NULL); g_return_if_fail (GTK_IS_STYLE_CONTEXT (context)); style = gtk_style_context_lookup_style (context); margin->top = round (_gtk_css_number_value_get (style->size->margin_top, 100)); margin->right = round (_gtk_css_number_value_get (style->size->margin_right, 100)); margin->bottom = round (_gtk_css_number_value_get (style->size->margin_bottom, 100)); margin->left = round (_gtk_css_number_value_get (style->size->margin_left, 100)); } void _gtk_style_context_get_cursor_color (GtkStyleContext *context, GdkRGBA *primary_color, GdkRGBA *secondary_color) { GtkCssStyle *style; style = gtk_style_context_lookup_style (context); if (primary_color) *primary_color = *gtk_css_color_value_get_rgba (style->font->caret_color ? style->font->caret_color : style->core->color); if (secondary_color) *secondary_color = *gtk_css_color_value_get_rgba (style->font->secondary_caret_color ? style->font->secondary_caret_color : style->core->color); } static void draw_insertion_cursor (GtkStyleContext *context, cairo_t *cr, gdouble x, gdouble y, gdouble height, float aspect_ratio, gboolean is_primary, PangoDirection direction, gboolean draw_arrow) { GdkRGBA primary_color; GdkRGBA secondary_color; gint stem_width; gint offset; cairo_save (cr); cairo_new_path (cr); _gtk_style_context_get_cursor_color (context, &primary_color, &secondary_color); gdk_cairo_set_source_rgba (cr, is_primary ? &primary_color : &secondary_color); stem_width = height * aspect_ratio + 1; /* put (stem_width % 2) on the proper side of the cursor */ if (direction == PANGO_DIRECTION_LTR) offset = stem_width / 2; else offset = stem_width - stem_width / 2; cairo_rectangle (cr, x - offset, y, stem_width, height); cairo_fill (cr); if (draw_arrow) { gint arrow_width; gint ax, ay; arrow_width = stem_width + 1; if (direction == PANGO_DIRECTION_RTL) { ax = x - offset - 1; ay = y + height - arrow_width * 2 - arrow_width + 1; cairo_move_to (cr, ax, ay + 1); cairo_line_to (cr, ax - arrow_width, ay + arrow_width); cairo_line_to (cr, ax, ay + 2 * arrow_width); cairo_fill (cr); } else if (direction == PANGO_DIRECTION_LTR) { ax = x + stem_width - offset; ay = y + height - arrow_width * 2 - arrow_width + 1; cairo_move_to (cr, ax, ay + 1); cairo_line_to (cr, ax + arrow_width, ay + arrow_width); cairo_line_to (cr, ax, ay + 2 * arrow_width); cairo_fill (cr); } else g_assert_not_reached(); } cairo_restore (cr); } static void get_insertion_cursor_bounds (gdouble height, float aspect_ratio, PangoDirection direction, gboolean draw_arrow, graphene_rect_t *bounds) { gint stem_width; gint offset; stem_width = height * aspect_ratio + 1; if (direction == PANGO_DIRECTION_LTR) offset = stem_width / 2; else offset = stem_width - stem_width / 2; if (draw_arrow) { if (direction == PANGO_DIRECTION_LTR) { graphene_rect_init (bounds, - offset, 0, 2 * stem_width + 1, height); } else { graphene_rect_init (bounds, - offset - stem_width - 2, 0, 2 * stem_width + 2, height); } } else { graphene_rect_init (bounds, - offset, 0, stem_width, height); } } static void snapshot_insertion_cursor (GtkSnapshot *snapshot, GtkStyleContext *context, gdouble height, float aspect_ratio, gboolean is_primary, PangoDirection direction, gboolean draw_arrow) { if (draw_arrow) { cairo_t *cr; graphene_rect_t bounds; get_insertion_cursor_bounds (height, aspect_ratio, direction, draw_arrow, &bounds); cr = gtk_snapshot_append_cairo (snapshot, &bounds); draw_insertion_cursor (context, cr, 0, 0, height, aspect_ratio, is_primary, direction, draw_arrow); cairo_destroy (cr); } else { GdkRGBA primary_color; GdkRGBA secondary_color; int stem_width; int offset; _gtk_style_context_get_cursor_color (context, &primary_color, &secondary_color); stem_width = height * aspect_ratio + 1; /* put (stem_width % 2) on the proper side of the cursor */ if (direction == PANGO_DIRECTION_LTR) offset = stem_width / 2; else offset = stem_width - stem_width / 2; gtk_snapshot_append_color (snapshot, is_primary ? &primary_color : &secondary_color, &GRAPHENE_RECT_INIT (- offset, 0, stem_width, height)); } } /** * gtk_render_insertion_cursor: * @context: a #GtkStyleContext * @cr: a #cairo_t * @x: X origin * @y: Y origin * @layout: the #PangoLayout of the text * @index: the index in the #PangoLayout * @direction: the #PangoDirection of the text * * Draws a text caret on @cr at the specified index of @layout. **/ void gtk_render_insertion_cursor (GtkStyleContext *context, cairo_t *cr, gdouble x, gdouble y, PangoLayout *layout, int index, PangoDirection direction) { GtkStyleContextPrivate *priv = gtk_style_context_get_instance_private (context); gboolean split_cursor; float aspect_ratio; PangoRectangle strong_pos, weak_pos; PangoRectangle *cursor1, *cursor2; GdkDevice *keyboard; PangoDirection keyboard_direction; PangoDirection direction2; g_return_if_fail (GTK_IS_STYLE_CONTEXT (context)); g_return_if_fail (cr != NULL); g_return_if_fail (PANGO_IS_LAYOUT (layout)); g_return_if_fail (index >= 0); g_object_get (gtk_settings_get_for_display (priv->display), "gtk-split-cursor", &split_cursor, "gtk-cursor-aspect-ratio", &aspect_ratio, NULL); keyboard = gdk_seat_get_keyboard (gdk_display_get_default_seat (priv->display)); keyboard_direction = gdk_device_get_direction (keyboard); pango_layout_get_cursor_pos (layout, index, &strong_pos, &weak_pos); direction2 = PANGO_DIRECTION_NEUTRAL; if (split_cursor) { cursor1 = &strong_pos; if (strong_pos.x != weak_pos.x || strong_pos.y != weak_pos.y) { direction2 = (direction == PANGO_DIRECTION_LTR) ? PANGO_DIRECTION_RTL : PANGO_DIRECTION_LTR; cursor2 = &weak_pos; } } else { if (keyboard_direction == direction) cursor1 = &strong_pos; else cursor1 = &weak_pos; } draw_insertion_cursor (context, cr, x + PANGO_PIXELS (cursor1->x), y + PANGO_PIXELS (cursor1->y), PANGO_PIXELS (cursor1->height), aspect_ratio, TRUE, direction, direction2 != PANGO_DIRECTION_NEUTRAL); if (direction2 != PANGO_DIRECTION_NEUTRAL) { draw_insertion_cursor (context, cr, x + PANGO_PIXELS (cursor2->x), y + PANGO_PIXELS (cursor2->y), PANGO_PIXELS (cursor2->height), aspect_ratio, FALSE, direction2, TRUE); } } /** * gtk_snapshot_render_insertion_cursor: * @snapshot: snapshot to render to * @context: a #GtkStyleContext * @x: X origin * @y: Y origin * @layout: the #PangoLayout of the text * @index: the index in the #PangoLayout * @direction: the #PangoDirection of the text * * Draws a text caret using @snapshot at the specified index of @layout. **/ void gtk_snapshot_render_insertion_cursor (GtkSnapshot *snapshot, GtkStyleContext *context, gdouble x, gdouble y, PangoLayout *layout, int index, PangoDirection direction) { GtkStyleContextPrivate *priv = gtk_style_context_get_instance_private (context); gboolean split_cursor; float aspect_ratio; PangoRectangle strong_pos, weak_pos; PangoRectangle *cursor1, *cursor2; GdkDevice *keyboard; PangoDirection keyboard_direction; PangoDirection direction2; g_return_if_fail (snapshot != NULL); g_return_if_fail (GTK_IS_STYLE_CONTEXT (context)); g_return_if_fail (PANGO_IS_LAYOUT (layout)); g_return_if_fail (index >= 0); g_object_get (gtk_settings_get_for_display (priv->display), "gtk-split-cursor", &split_cursor, "gtk-cursor-aspect-ratio", &aspect_ratio, NULL); keyboard = gdk_seat_get_keyboard (gdk_display_get_default_seat (priv->display)); keyboard_direction = gdk_device_get_direction (keyboard); pango_layout_get_cursor_pos (layout, index, &strong_pos, &weak_pos); direction2 = PANGO_DIRECTION_NEUTRAL; if (split_cursor) { cursor1 = &strong_pos; if (strong_pos.x != weak_pos.x || strong_pos.y != weak_pos.y) { direction2 = (direction == PANGO_DIRECTION_LTR) ? PANGO_DIRECTION_RTL : PANGO_DIRECTION_LTR; cursor2 = &weak_pos; } } else { if (keyboard_direction == direction) cursor1 = &strong_pos; else cursor1 = &weak_pos; } gtk_snapshot_save (snapshot); gtk_snapshot_translate (snapshot, &GRAPHENE_POINT_INIT (x + PANGO_PIXELS (cursor1->x), y + PANGO_PIXELS (cursor1->y))); snapshot_insertion_cursor (snapshot, context, PANGO_PIXELS (cursor1->height), aspect_ratio, TRUE, direction, direction2 != PANGO_DIRECTION_NEUTRAL); gtk_snapshot_restore (snapshot); if (direction2 != PANGO_DIRECTION_NEUTRAL) { gtk_snapshot_save (snapshot); gtk_snapshot_translate (snapshot, &GRAPHENE_POINT_INIT (x + PANGO_PIXELS (cursor2->x), y + PANGO_PIXELS (cursor2->y))); snapshot_insertion_cursor (snapshot, context, PANGO_PIXELS (cursor2->height), aspect_ratio, FALSE, direction2, TRUE); gtk_snapshot_restore (snapshot); } } static AtkAttributeSet * add_attribute (AtkAttributeSet *attributes, AtkTextAttribute attr, const gchar *value) { AtkAttribute *at; at = g_new (AtkAttribute, 1); at->name = g_strdup (atk_text_attribute_get_name (attr)); at->value = g_strdup (value); return g_slist_prepend (attributes, at); } /* * _gtk_style_context_get_attributes: * @attributes: a #AtkAttributeSet to add attributes to * @context: the #GtkStyleContext to get attributes from * @flags: the state to use with @context * * Adds the foreground and background color from @context to * @attributes, after translating them to ATK attributes. * * This is a convenience function that can be used in * implementing the #AtkText interface in widgets. * * Returns: the modified #AtkAttributeSet */ AtkAttributeSet * _gtk_style_context_get_attributes (AtkAttributeSet *attributes, GtkStyleContext *context) { const GdkRGBA *color; gchar *value; color = gtk_css_color_value_get_rgba (_gtk_style_context_peek_property (context, GTK_CSS_PROPERTY_BACKGROUND_COLOR)); value = g_strdup_printf ("%u,%u,%u", (guint) ceil (color->red * 65536 - color->red), (guint) ceil (color->green * 65536 - color->green), (guint) ceil (color->blue * 65536 - color->blue)); attributes = add_attribute (attributes, ATK_TEXT_ATTR_BG_COLOR, value); color = gtk_css_color_value_get_rgba (_gtk_style_context_peek_property (context, GTK_CSS_PROPERTY_COLOR)); value = g_strdup_printf ("%u,%u,%u", (guint) ceil (color->red * 65536 - color->red), (guint) ceil (color->green * 65536 - color->green), (guint) ceil (color->blue * 65536 - color->blue)); attributes = add_attribute (attributes, ATK_TEXT_ATTR_FG_COLOR, value); return attributes; } /** * GtkStyleContextPrintFlags: * @GTK_STYLE_CONTEXT_PRINT_NONE: Default value. * @GTK_STYLE_CONTEXT_PRINT_RECURSE: Print the entire tree of * CSS nodes starting at the style context's node * @GTK_STYLE_CONTEXT_PRINT_SHOW_STYLE: Show the values of the * CSS properties for each node * @GTK_STYLE_CONTEXT_PRINT_SHOW_CHANGE: Show information about * what changes affect the styles * * Flags that modify the behavior of gtk_style_context_to_string(). * New values may be added to this enumeration. */ /** * gtk_style_context_to_string: * @context: a #GtkStyleContext * @flags: Flags that determine what to print * * Converts the style context into a string representation. * * The string representation always includes information about * the name, state, id, visibility and style classes of the CSS * node that is backing @context. Depending on the flags, more * information may be included. * * This function is intended for testing and debugging of the * CSS implementation in GTK+. There are no guarantees about * the format of the returned string, it may change. * * Returns: a newly allocated string representing @context */ char * gtk_style_context_to_string (GtkStyleContext *context, GtkStyleContextPrintFlags flags) { GtkStyleContextPrivate *priv = gtk_style_context_get_instance_private (context); GString *string; g_return_val_if_fail (GTK_IS_STYLE_CONTEXT (context), NULL); string = g_string_new (""); gtk_css_node_print (priv->cssnode, flags, string, 0); return g_string_free (string, FALSE); }