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gtk2/gtk/gtkfontchooserwidget.c
Matthias Clasen 67f259cd1a fontchooser: Populate the list incrementally 
By adding 20 fonts / frame to the font list, we can
get the font chooser dialog to show up much faster.

This change gets the font chooser up in 265ms here.
2020-08-28 18:45:01 +02:00

2102 lines
66 KiB
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/* GTK - The GIMP Toolkit
* Copyright (C) 2011 Alberto Ruiz <aruiz@gnome.org>
*
* 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 <http://www.gnu.org/licenses/>.
*/
#include "config.h"
#include <stdlib.h>
#include <glib/gprintf.h>
#include <string.h>
#include "gtkfontchooserwidget.h"
#include "gtkfontchooserwidgetprivate.h"
#include "gtkadjustment.h"
#include "gtkbuildable.h"
#include "gtkbox.h"
#include "gtkbinlayout.h"
#include "gtkcustomfilter.h"
#include "gtkentry.h"
#include "gtkfilter.h"
#include "gtkgrid.h"
#include "gtkfontchooser.h"
#include "gtkfontchooserutils.h"
#include "gtkintl.h"
#include "gtklabel.h"
#include "gtksingleselection.h"
#include "gtkstack.h"
#include "gtkprivate.h"
#include "gtkscale.h"
#include "gtkscrolledwindow.h"
#include "gtksearchentry.h"
#include "gtkspinbutton.h"
#include "gtkstylecontextprivate.h"
#include "gtktextview.h"
#include "gtkwidgetprivate.h"
#include "gtksettings.h"
#include "gtkdialog.h"
#include "gtkradiobutton.h"
#include "gtkgestureclick.h"
#include "gtkeventcontrollerscroll.h"
#include "gtkroot.h"
#include "gtkfilterlistmodel.h"
#include "gtkflattenlistmodel.h"
#include "gtkslicelistmodel.h"
#include "gtkmaplistmodel.h"
#include <hb-ot.h>
#include "language-names.h"
#include "script-names.h"
#include "open-type-layout.h"
/**
* SECTION:gtkfontchooserwidget
* @Short_description: A widget for selecting fonts
* @Title: GtkFontChooserWidget
* @See_also: #GtkFontChooserDialog
*
* The #GtkFontChooserWidget widget lists the available fonts,
* styles and sizes, allowing the user to select a font. It is
* used in the #GtkFontChooserDialog widget to provide a
* dialog box for selecting fonts.
*
* To set the font which is initially selected, use
* gtk_font_chooser_set_font() or gtk_font_chooser_set_font_desc().
*
* To get the selected font use gtk_font_chooser_get_font() or
* gtk_font_chooser_get_font_desc().
*
* To change the text which is shown in the preview area, use
* gtk_font_chooser_set_preview_text().
*
* # CSS nodes
*
* GtkFontChooserWidget has a single CSS node with name fontchooser.
*/
typedef struct _GtkFontChooserWidgetClass GtkFontChooserWidgetClass;
struct _GtkFontChooserWidget
{
GtkWidget parent_instance;
GtkWidget *stack;
GtkWidget *grid;
GtkWidget *search_entry;
GtkWidget *family_face_list;
GtkWidget *list_stack;
GtkSingleSelection *selection;
GtkCustomFilter *custom_filter;
GtkFilterListModel *filter_model;
GtkWidget *preview;
GtkWidget *preview2;
GtkWidget *font_name_label;
char *preview_text;
gboolean show_preview_entry;
GtkWidget *size_label;
GtkWidget *size_spin;
GtkWidget *size_slider;
GtkWidget *size_slider2;
GtkWidget *axis_grid;
GtkWidget *feature_box;
PangoFontMap *font_map;
PangoFontDescription *font_desc;
char *font_features;
PangoLanguage *language;
GtkFontFilterFunc filter_func;
gpointer filter_data;
GDestroyNotify filter_data_destroy;
guint last_fontconfig_timestamp;
GtkFontChooserLevel level;
GHashTable *axes;
gboolean updating_variations;
GList *feature_items;
GAction *tweak_action;
};
struct _GtkFontChooserWidgetClass
{
GtkWidgetClass parent_class;
};
enum {
PROP_ZERO,
PROP_TWEAK_ACTION
};
static void gtk_font_chooser_widget_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec);
static void gtk_font_chooser_widget_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec);
static void gtk_font_chooser_widget_finalize (GObject *object);
static char *gtk_font_chooser_widget_get_font (GtkFontChooserWidget *fontchooser);
static void gtk_font_chooser_widget_set_font (GtkFontChooserWidget *fontchooser,
const char *fontname);
static PangoFontDescription *gtk_font_chooser_widget_get_font_desc (GtkFontChooserWidget *fontchooser);
static void gtk_font_chooser_widget_merge_font_desc(GtkFontChooserWidget *fontchooser,
const PangoFontDescription *font_desc);
static void gtk_font_chooser_widget_take_font_desc (GtkFontChooserWidget *fontchooser,
PangoFontDescription *font_desc);
static const char *gtk_font_chooser_widget_get_preview_text (GtkFontChooserWidget *fontchooser);
static void gtk_font_chooser_widget_set_preview_text (GtkFontChooserWidget *fontchooser,
const char *text);
static gboolean gtk_font_chooser_widget_get_show_preview_entry (GtkFontChooserWidget *fontchooser);
static void gtk_font_chooser_widget_set_show_preview_entry (GtkFontChooserWidget *fontchooser,
gboolean show_preview_entry);
static void gtk_font_chooser_widget_populate_features (GtkFontChooserWidget *fontchooser);
static void gtk_font_chooser_widget_set_level (GtkFontChooserWidget *fontchooser,
GtkFontChooserLevel level);
static GtkFontChooserLevel gtk_font_chooser_widget_get_level (GtkFontChooserWidget *fontchooser);
static void gtk_font_chooser_widget_set_language (GtkFontChooserWidget *fontchooser,
const char *language);
static void update_font_features (GtkFontChooserWidget *fontchooser);
static void gtk_font_chooser_widget_iface_init (GtkFontChooserIface *iface);
G_DEFINE_TYPE_WITH_CODE (GtkFontChooserWidget, gtk_font_chooser_widget, GTK_TYPE_WIDGET,
G_IMPLEMENT_INTERFACE (GTK_TYPE_FONT_CHOOSER,
gtk_font_chooser_widget_iface_init))
static void
gtk_font_chooser_widget_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec)
{
GtkFontChooserWidget *fontchooser = GTK_FONT_CHOOSER_WIDGET (object);
switch (prop_id)
{
case GTK_FONT_CHOOSER_PROP_FONT:
gtk_font_chooser_widget_set_font (fontchooser, g_value_get_string (value));
break;
case GTK_FONT_CHOOSER_PROP_FONT_DESC:
gtk_font_chooser_widget_take_font_desc (fontchooser, g_value_dup_boxed (value));
break;
case GTK_FONT_CHOOSER_PROP_PREVIEW_TEXT:
gtk_font_chooser_widget_set_preview_text (fontchooser, g_value_get_string (value));
break;
case GTK_FONT_CHOOSER_PROP_SHOW_PREVIEW_ENTRY:
gtk_font_chooser_widget_set_show_preview_entry (fontchooser, g_value_get_boolean (value));
break;
case GTK_FONT_CHOOSER_PROP_LEVEL:
gtk_font_chooser_widget_set_level (fontchooser, g_value_get_flags (value));
break;
case GTK_FONT_CHOOSER_PROP_LANGUAGE:
gtk_font_chooser_widget_set_language (fontchooser, g_value_get_string (value));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gtk_font_chooser_widget_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec)
{
GtkFontChooserWidget *fontchooser = GTK_FONT_CHOOSER_WIDGET (object);
switch (prop_id)
{
case PROP_TWEAK_ACTION:
g_value_set_object (value, G_OBJECT (fontchooser->tweak_action));
break;
case GTK_FONT_CHOOSER_PROP_FONT:
g_value_take_string (value, gtk_font_chooser_widget_get_font (fontchooser));
break;
case GTK_FONT_CHOOSER_PROP_FONT_DESC:
g_value_set_boxed (value, gtk_font_chooser_widget_get_font_desc (fontchooser));
break;
case GTK_FONT_CHOOSER_PROP_PREVIEW_TEXT:
g_value_set_string (value, gtk_font_chooser_widget_get_preview_text (fontchooser));
break;
case GTK_FONT_CHOOSER_PROP_SHOW_PREVIEW_ENTRY:
g_value_set_boolean (value, gtk_font_chooser_widget_get_show_preview_entry (fontchooser));
break;
case GTK_FONT_CHOOSER_PROP_LEVEL:
g_value_set_flags (value, gtk_font_chooser_widget_get_level (fontchooser));
break;
case GTK_FONT_CHOOSER_PROP_FONT_FEATURES:
g_value_set_string (value, fontchooser->font_features);
break;
case GTK_FONT_CHOOSER_PROP_LANGUAGE:
g_value_set_string (value, pango_language_to_string (fontchooser->language));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
stop_search_cb (GtkSearchEntry *entry,
GtkFontChooserWidget *fc)
{
if (gtk_editable_get_text (GTK_EDITABLE (entry))[0] != 0)
gtk_editable_set_text (GTK_EDITABLE (entry), "");
else
{
GtkWidget *dialog;
GtkWidget *button = NULL;
dialog = gtk_widget_get_ancestor (GTK_WIDGET (fc), GTK_TYPE_DIALOG);
if (dialog)
button = gtk_dialog_get_widget_for_response (GTK_DIALOG (dialog), GTK_RESPONSE_CANCEL);
if (button)
gtk_widget_activate (button);
}
}
static void
size_change_cb (GtkAdjustment *adjustment,
gpointer user_data)
{
GtkFontChooserWidget *fontchooser = user_data;
PangoFontDescription *font_desc;
double size = gtk_adjustment_get_value (adjustment);
font_desc = pango_font_description_new ();
if (pango_font_description_get_size_is_absolute (fontchooser->font_desc))
pango_font_description_set_absolute_size (font_desc, size * PANGO_SCALE);
else
pango_font_description_set_size (font_desc, size * PANGO_SCALE);
gtk_font_chooser_widget_take_font_desc (fontchooser, font_desc);
}
static gboolean
output_cb (GtkSpinButton *spin,
gpointer data)
{
GtkAdjustment *adjustment;
char *text;
double value;
adjustment = gtk_spin_button_get_adjustment (spin);
value = gtk_adjustment_get_value (adjustment);
text = g_strdup_printf ("%2.4g", value);
gtk_editable_set_text (GTK_EDITABLE (spin), text);
g_free (text);
return TRUE;
}
static void
gtk_font_chooser_widget_update_marks (GtkFontChooserWidget *self)
{
GtkAdjustment *adj, *spin_adj;
const int *sizes;
int *font_sizes;
int i, n_sizes;
double value, spin_value;
gpointer item;
item = gtk_single_selection_get_selected_item (self->selection);
if (item)
{
PangoFontFace *face;
if (PANGO_IS_FONT_FAMILY (item))
face = pango_font_family_get_face (item, NULL);
else
face = item;
pango_font_face_list_sizes (face, &font_sizes, &n_sizes);
/* It seems not many fonts actually have a sane set of sizes */
for (i = 0; i < n_sizes; i++)
font_sizes[i] = font_sizes[i] / PANGO_SCALE;
}
else
{
font_sizes = NULL;
n_sizes = 0;
}
if (n_sizes < 2)
{
static const int fallback_sizes[] = {
6, 8, 9, 10, 11, 12, 13, 14, 16, 20, 24, 36, 48, 72
};
sizes = fallback_sizes;
n_sizes = G_N_ELEMENTS (fallback_sizes);
}
else
{
sizes = font_sizes;
}
gtk_scale_clear_marks (GTK_SCALE (self->size_slider));
gtk_scale_clear_marks (GTK_SCALE (self->size_slider2));
adj = gtk_range_get_adjustment (GTK_RANGE (self->size_slider));
spin_adj = gtk_spin_button_get_adjustment (GTK_SPIN_BUTTON (self->size_spin));
spin_value = gtk_adjustment_get_value (spin_adj);
if (spin_value < sizes[0])
value = (double) sizes[0];
else if (spin_value > sizes[n_sizes - 1])
value = (double)sizes[n_sizes - 1];
else
value = (double)spin_value;
/* ensure clamping doesn't callback into font resizing code */
g_signal_handlers_block_by_func (adj, size_change_cb, self);
gtk_adjustment_configure (adj,
value,
sizes[0],
sizes[n_sizes - 1],
gtk_adjustment_get_step_increment (adj),
gtk_adjustment_get_page_increment (adj),
gtk_adjustment_get_page_size (adj));
g_signal_handlers_unblock_by_func (adj, size_change_cb, self);
for (i = 0; i < n_sizes; i++)
{
gtk_scale_add_mark (GTK_SCALE (self->size_slider),
sizes[i],
GTK_POS_BOTTOM, NULL);
gtk_scale_add_mark (GTK_SCALE (self->size_slider2),
sizes[i],
GTK_POS_BOTTOM, NULL);
}
g_free (font_sizes);
}
static void
row_activated_cb (GtkWidget *view,
guint pos,
gpointer user_data)
{
GtkFontChooserWidget *fontchooser = user_data;
char *fontname;
fontname = gtk_font_chooser_widget_get_font (fontchooser);
_gtk_font_chooser_font_activated (GTK_FONT_CHOOSER (fontchooser), fontname);
g_free (fontname);
}
static void
resize_by_scroll_cb (GtkEventControllerScroll *controller,
double dx,
double dy,
gpointer user_data)
{
GtkFontChooserWidget *self = user_data;
GtkAdjustment *adj = gtk_spin_button_get_adjustment (GTK_SPIN_BUTTON (self->size_spin));
gtk_adjustment_set_value (adj,
gtk_adjustment_get_value (adj) +
gtk_adjustment_get_step_increment (adj) * dx);
}
static void
selection_changed_cb (GtkSingleSelection *selection,
GParamSpec *pspec,
GtkFontChooserWidget *self)
{
gpointer item;
item = gtk_single_selection_get_selected_item (selection);
if (item)
{
PangoFontFace *face;
PangoFontDescription *desc;
if (PANGO_IS_FONT_FAMILY (item))
face = pango_font_family_get_face (item, NULL);
else
face = item;
desc = pango_font_face_describe (face);
pango_font_description_set_variations (self->font_desc, NULL);
gtk_font_chooser_widget_merge_font_desc (self, desc);
pango_font_description_free (desc);
g_simple_action_set_enabled (G_SIMPLE_ACTION (self->tweak_action), TRUE);
}
else
{
g_simple_action_set_state (G_SIMPLE_ACTION (self->tweak_action), g_variant_new_boolean (FALSE));
g_simple_action_set_enabled (G_SIMPLE_ACTION (self->tweak_action), FALSE);
}
g_object_notify (G_OBJECT (self), "font");
g_object_notify (G_OBJECT (self), "font-desc");
}
static char *
get_font_name (GObject *ignore,
gpointer item)
{
if (item == NULL)
return NULL;
if (PANGO_IS_FONT_FACE (item))
{
return g_strconcat (pango_font_family_get_name (pango_font_face_get_family (item)),
" ",
pango_font_face_get_face_name (item),
NULL);
}
else
{
return g_strdup (pango_font_family_get_name (item));
}
}
static PangoAttrList *
get_font_attributes (GObject *ignore,
gpointer item)
{
PangoAttribute *attribute;
PangoAttrList *attrs;
attrs = pango_attr_list_new ();
if (item)
{
PangoFontFace *face;
PangoFontDescription *font_desc;
if (PANGO_IS_FONT_FAMILY (item))
face = pango_font_family_get_face (item, NULL);
else
face = item;
font_desc = pango_font_face_describe (face);
attribute = pango_attr_font_desc_new (font_desc);
pango_attr_list_insert (attrs, attribute);
pango_font_description_free (font_desc);
}
return attrs;
}
static void
gtk_font_chooser_widget_update_preview_attributes (GtkFontChooserWidget *fontchooser)
{
PangoAttrList *attrs;
attrs = pango_attr_list_new ();
/* Prevent font fallback */
pango_attr_list_insert (attrs, pango_attr_fallback_new (FALSE));
/* Force current font and features */
pango_attr_list_insert (attrs, pango_attr_font_desc_new (fontchooser->font_desc));
if (fontchooser->font_features)
pango_attr_list_insert (attrs, pango_attr_font_features_new (fontchooser->font_features));
if (fontchooser->language)
pango_attr_list_insert (attrs, pango_attr_language_new (fontchooser->language));
gtk_entry_set_attributes (GTK_ENTRY (fontchooser->preview), attrs);
pango_attr_list_unref (attrs);
}
static void
rows_changed_cb (GtkFontChooserWidget *self)
{
const char *page;
if (g_list_model_get_n_items (G_LIST_MODEL (self->selection)) == 0)
page = "empty";
else
page = "list";
if (strcmp (gtk_stack_get_visible_child_name (GTK_STACK (self->list_stack)), page) != 0)
gtk_stack_set_visible_child_name (GTK_STACK (self->list_stack), page);
}
static void
update_key_capture (GtkWidget *chooser)
{
GtkFontChooserWidget *fontchooser = GTK_FONT_CHOOSER_WIDGET (chooser);
GtkWidget *capture_widget;
if (gtk_widget_get_mapped (chooser) &&
g_str_equal (gtk_stack_get_visible_child_name (GTK_STACK (fontchooser->stack)), "list"))
{
GtkWidget *toplevel;
GtkWidget *focus;
toplevel = GTK_WIDGET (gtk_widget_get_root (chooser));
focus = gtk_root_get_focus (GTK_ROOT (toplevel));
if (GTK_IS_EDITABLE (focus) && focus != fontchooser->search_entry)
capture_widget = NULL;
else
capture_widget = chooser;
}
else
capture_widget = NULL;
gtk_search_entry_set_key_capture_widget (GTK_SEARCH_ENTRY (fontchooser->search_entry),
capture_widget);
}
static void
gtk_font_chooser_widget_map (GtkWidget *widget)
{
GtkFontChooserWidget *fontchooser = GTK_FONT_CHOOSER_WIDGET (widget);
gtk_editable_set_text (GTK_EDITABLE (fontchooser->search_entry), "");
gtk_stack_set_visible_child_name (GTK_STACK (fontchooser->stack), "list");
g_simple_action_set_state (G_SIMPLE_ACTION (fontchooser->tweak_action), g_variant_new_boolean (FALSE));
GTK_WIDGET_CLASS (gtk_font_chooser_widget_parent_class)->map (widget);
update_key_capture (widget);
}
static void
gtk_font_chooser_widget_unmap (GtkWidget *widget)
{
update_key_capture (widget);
GTK_WIDGET_CLASS (gtk_font_chooser_widget_parent_class)->unmap (widget);
}
static void
gtk_font_chooser_widget_root (GtkWidget *widget)
{
GTK_WIDGET_CLASS (gtk_font_chooser_widget_parent_class)->root (widget);
g_signal_connect_swapped (gtk_widget_get_root (widget), "notify::focus-widget",
G_CALLBACK (update_key_capture), widget);
}
static void
gtk_font_chooser_widget_unroot (GtkWidget *widget)
{
g_signal_handlers_disconnect_by_func (gtk_widget_get_root (widget),
update_key_capture, widget);
GTK_WIDGET_CLASS (gtk_font_chooser_widget_parent_class)->unroot (widget);
}
static void
gtk_font_chooser_widget_dispose (GObject *object)
{
GtkFontChooserWidget *self = GTK_FONT_CHOOSER_WIDGET (object);
self->filter_func = NULL;
g_clear_pointer (&self->filter_data, self->filter_data_destroy);
g_clear_pointer (&self->stack, gtk_widget_unparent);
G_OBJECT_CLASS (gtk_font_chooser_widget_parent_class)->dispose (object);
}
static void
gtk_font_chooser_widget_class_init (GtkFontChooserWidgetClass *klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (klass);
GParamSpec *pspec;
g_type_ensure (G_TYPE_THEMED_ICON);
widget_class->root = gtk_font_chooser_widget_root;
widget_class->unroot = gtk_font_chooser_widget_unroot;
widget_class->map = gtk_font_chooser_widget_map;
widget_class->unmap = gtk_font_chooser_widget_unmap;
gobject_class->finalize = gtk_font_chooser_widget_finalize;
gobject_class->dispose = gtk_font_chooser_widget_dispose;
gobject_class->set_property = gtk_font_chooser_widget_set_property;
gobject_class->get_property = gtk_font_chooser_widget_get_property;
/**
* GtkFontChooserWidget:tweak-action:
*
* A toggle action that can be used to switch to the tweak page
* of the font chooser widget, which lets the user tweak the
* OpenType features and variation axes of the selected font.
*
* The action will be enabled or disabled depending on whether
* the selected font has any features or axes.
*/
pspec = g_param_spec_object ("tweak-action",
P_("The tweak action"),
P_("The toggle action to switch to the tweak page"),
G_TYPE_ACTION,
G_PARAM_READABLE | G_PARAM_STATIC_STRINGS);
g_object_class_install_property (gobject_class, PROP_TWEAK_ACTION, pspec);
_gtk_font_chooser_install_properties (gobject_class);
/* Bind class to template */
gtk_widget_class_set_template_from_resource (widget_class,
"/org/gtk/libgtk/ui/gtkfontchooserwidget.ui");
gtk_widget_class_bind_template_child (widget_class, GtkFontChooserWidget, search_entry);
gtk_widget_class_bind_template_child (widget_class, GtkFontChooserWidget, family_face_list);
gtk_widget_class_bind_template_child (widget_class, GtkFontChooserWidget, list_stack);
gtk_widget_class_bind_template_child (widget_class, GtkFontChooserWidget, filter_model);
gtk_widget_class_bind_template_child (widget_class, GtkFontChooserWidget, selection);
gtk_widget_class_bind_template_child (widget_class, GtkFontChooserWidget, custom_filter);
gtk_widget_class_bind_template_child (widget_class, GtkFontChooserWidget, preview);
gtk_widget_class_bind_template_child (widget_class, GtkFontChooserWidget, preview2);
gtk_widget_class_bind_template_child (widget_class, GtkFontChooserWidget, size_label);
gtk_widget_class_bind_template_child (widget_class, GtkFontChooserWidget, size_spin);
gtk_widget_class_bind_template_child (widget_class, GtkFontChooserWidget, size_slider);
gtk_widget_class_bind_template_child (widget_class, GtkFontChooserWidget, size_slider2);
gtk_widget_class_bind_template_child (widget_class, GtkFontChooserWidget, stack);
gtk_widget_class_bind_template_child (widget_class, GtkFontChooserWidget, grid);
gtk_widget_class_bind_template_child (widget_class, GtkFontChooserWidget, font_name_label);
gtk_widget_class_bind_template_child (widget_class, GtkFontChooserWidget, feature_box);
gtk_widget_class_bind_template_child (widget_class, GtkFontChooserWidget, axis_grid);
gtk_widget_class_bind_template_callback (widget_class, get_font_name);
gtk_widget_class_bind_template_callback (widget_class, get_font_attributes);
gtk_widget_class_bind_template_callback (widget_class, stop_search_cb);
gtk_widget_class_bind_template_callback (widget_class, row_activated_cb);
gtk_widget_class_bind_template_callback (widget_class, rows_changed_cb);
gtk_widget_class_bind_template_callback (widget_class, size_change_cb);
gtk_widget_class_bind_template_callback (widget_class, output_cb);
gtk_widget_class_bind_template_callback (widget_class, selection_changed_cb);
gtk_widget_class_bind_template_callback (widget_class, resize_by_scroll_cb);
gtk_widget_class_set_layout_manager_type (widget_class, GTK_TYPE_BIN_LAYOUT);
gtk_widget_class_set_css_name (widget_class, I_("fontchooser"));
}
static void
change_tweak (GSimpleAction *action,
GVariant *state,
gpointer data)
{
GtkFontChooserWidget *fontchooser = data;
gboolean tweak = g_variant_get_boolean (state);
if (tweak)
{
gtk_entry_grab_focus_without_selecting (GTK_ENTRY (fontchooser->preview2));
gtk_stack_set_visible_child_name (GTK_STACK (fontchooser->stack), "tweaks");
}
else
{
gtk_widget_grab_focus (fontchooser->search_entry);
gtk_stack_set_visible_child_name (GTK_STACK (fontchooser->stack), "list");
}
g_simple_action_set_state (action, state);
}
typedef struct {
guint32 tag;
GtkAdjustment *adjustment;
GtkWidget *label;
GtkWidget *scale;
GtkWidget *spin;
GtkWidget *fontchooser;
} Axis;
static guint
axis_hash (gconstpointer v)
{
const Axis *a = v;
return a->tag;
}
static gboolean
axis_equal (gconstpointer v1, gconstpointer v2)
{
const Axis *a1 = v1;
const Axis *a2 = v2;
return a1->tag == a2->tag;
}
static void
axis_remove (gpointer key,
gpointer value,
gpointer data)
{
GtkFontChooserWidget *fontchooser = data;
Axis *a = value;
gtk_grid_remove (GTK_GRID (fontchooser->axis_grid), a->label);
gtk_grid_remove (GTK_GRID (fontchooser->axis_grid), a->scale);
gtk_grid_remove (GTK_GRID (fontchooser->axis_grid), a->spin);
}
static void
axis_free (gpointer v)
{
Axis *a = v;
g_free (a);
}
/* We incrementally populate our fontlist to prevent blocking
* the font chooser for a long time with expensive FcFontSort
* calls in pango for every row in the list).
*/
static gboolean
add_to_fontlist (GtkWidget *widget,
GdkFrameClock *clock,
gpointer user_data)
{
GtkFontChooserWidget *self = GTK_FONT_CHOOSER_WIDGET (widget);
GtkSliceListModel *model = user_data;
GListModel *child_model;
guint n;
if (gtk_filter_list_model_get_model (self->filter_model) != G_LIST_MODEL (model))
return G_SOURCE_REMOVE;
child_model = gtk_slice_list_model_get_model (model);
n = gtk_slice_list_model_get_size (model);
n += 10;
if (n >= g_list_model_get_n_items (child_model))
n = G_MAXUINT;
gtk_slice_list_model_set_size (model, n);
if (n == G_MAXUINT)
return G_SOURCE_REMOVE;
else
return G_SOURCE_CONTINUE;
}
static void
update_fontlist (GtkFontChooserWidget *self)
{
PangoFontMap *fontmap;
GListModel *model;
fontmap = self->font_map;
if (!fontmap)
fontmap = pango_cairo_font_map_get_default ();
if ((self->level & GTK_FONT_CHOOSER_LEVEL_STYLE) == 0)
model = g_object_ref (G_LIST_MODEL (fontmap));
else
model = G_LIST_MODEL (gtk_flatten_list_model_new (G_LIST_MODEL (g_object_ref (fontmap))));
model = G_LIST_MODEL (gtk_slice_list_model_new (model, 0, 20));
gtk_widget_add_tick_callback (GTK_WIDGET (self), add_to_fontlist, g_object_ref (model), g_object_unref);
gtk_filter_list_model_set_model (self->filter_model, model);
g_object_unref (model);
}
static void
gtk_font_chooser_widget_init (GtkFontChooserWidget *self)
{
gtk_widget_init_template (GTK_WIDGET (self));
self->axes = g_hash_table_new_full (axis_hash, axis_equal, NULL, axis_free);
/* Default preview string */
self->preview_text = g_strdup (pango_language_get_sample_string (NULL));
self->show_preview_entry = TRUE;
self->font_desc = pango_font_description_new ();
self->level = GTK_FONT_CHOOSER_LEVEL_FAMILY |
GTK_FONT_CHOOSER_LEVEL_STYLE |
GTK_FONT_CHOOSER_LEVEL_SIZE;
self->language = pango_language_get_default ();
/* Set default preview text */
gtk_editable_set_text (GTK_EDITABLE (self->preview), self->preview_text);
gtk_font_chooser_widget_update_preview_attributes (self);
/* Set the upper values of the spin/scale with G_MAXINT / PANGO_SCALE */
gtk_spin_button_set_range (GTK_SPIN_BUTTON (self->size_spin),
1.0, (double)(G_MAXINT / PANGO_SCALE));
gtk_adjustment_set_upper (gtk_range_get_adjustment (GTK_RANGE (self->size_slider)),
(double)(G_MAXINT / PANGO_SCALE));
self->tweak_action = G_ACTION (g_simple_action_new_stateful ("tweak", NULL, g_variant_new_boolean (FALSE)));
g_signal_connect (self->tweak_action, "change-state", G_CALLBACK (change_tweak), self);
update_fontlist (self);
/* Load data and set initial style-dependent parameters */
gtk_font_chooser_widget_populate_features (self);
gtk_font_chooser_widget_take_font_desc (self, NULL);
}
/**
* gtk_font_chooser_widget_new:
*
* Creates a new #GtkFontChooserWidget.
*
* Returns: a new #GtkFontChooserWidget
*/
GtkWidget *
gtk_font_chooser_widget_new (void)
{
return g_object_new (GTK_TYPE_FONT_CHOOSER_WIDGET, NULL);
}
static void
gtk_font_chooser_widget_finalize (GObject *object)
{
GtkFontChooserWidget *fontchooser = GTK_FONT_CHOOSER_WIDGET (object);
if (fontchooser->font_desc)
pango_font_description_free (fontchooser->font_desc);
if (fontchooser->filter_data_destroy)
fontchooser->filter_data_destroy (fontchooser->filter_data);
g_free (fontchooser->preview_text);
g_clear_object (&fontchooser->font_map);
g_object_unref (fontchooser->tweak_action);
g_list_free_full (fontchooser->feature_items, g_free);
g_hash_table_unref (fontchooser->axes);
g_free (fontchooser->font_features);
G_OBJECT_CLASS (gtk_font_chooser_widget_parent_class)->finalize (object);
}
static gboolean
my_pango_font_family_equal (const char *familya,
const char *familyb)
{
return g_ascii_strcasecmp (familya, familyb) == 0;
}
static void
gtk_font_chooser_widget_ensure_matching_selection (GtkFontChooserWidget *self)
{
const char *desc_family;
guint i, n;
desc_family = pango_font_description_get_family (self->font_desc);
if (desc_family == NULL)
{
gtk_single_selection_set_selected (self->selection, GTK_INVALID_LIST_POSITION);
return;
}
n = g_list_model_get_n_items (G_LIST_MODEL (self->selection));
for (i = 0; i < n; i++)
{
gpointer item = g_list_model_get_item (G_LIST_MODEL (self->selection), i);
PangoFontFace *face;
PangoFontFamily *family;
PangoFontDescription *merged;
if (PANGO_IS_FONT_FAMILY (item))
{
family = item;
face = pango_font_family_get_face (family, NULL);
}
else
{
face = item;
family = pango_font_face_get_family (face);
}
if (!my_pango_font_family_equal (desc_family, pango_font_family_get_name (family)))
{
g_object_unref (face);
continue;
}
merged = pango_font_face_describe (face);
pango_font_description_merge_static (merged, self->font_desc, FALSE);
g_object_unref (face);
if (pango_font_description_equal (merged, self->font_desc))
{
pango_font_description_free (merged);
break;
}
pango_font_description_free (merged);
}
gtk_single_selection_set_selected (self->selection, i);
}
static PangoFontFace *
gtk_font_chooser_widget_get_face (GtkFontChooser *chooser)
{
GtkFontChooserWidget *self = GTK_FONT_CHOOSER_WIDGET (chooser);
gpointer item;
item = gtk_single_selection_get_selected_item (self->selection);
if (PANGO_IS_FONT_FAMILY (item))
return pango_font_family_get_face (item, NULL);
else
return item;
}
static PangoFontFamily *
gtk_font_chooser_widget_get_family (GtkFontChooser *chooser)
{
GtkFontChooserWidget *self = GTK_FONT_CHOOSER_WIDGET (chooser);
gpointer item;
item = gtk_single_selection_get_selected_item (self->selection);
if (item == NULL)
return NULL;
if (PANGO_IS_FONT_FAMILY (item))
return item;
else
return pango_font_face_get_family (item);
}
static int
gtk_font_chooser_widget_get_size (GtkFontChooser *chooser)
{
GtkFontChooserWidget *fontchooser = GTK_FONT_CHOOSER_WIDGET (chooser);
PangoFontDescription *desc = gtk_font_chooser_widget_get_font_desc (fontchooser);
if (desc)
return pango_font_description_get_size (desc);
return -1;
}
static char *
gtk_font_chooser_widget_get_font (GtkFontChooserWidget *fontchooser)
{
PangoFontDescription *desc = gtk_font_chooser_widget_get_font_desc (fontchooser);
if (desc)
return pango_font_description_to_string (desc);
return NULL;
}
static PangoFontDescription *
gtk_font_chooser_widget_get_font_desc (GtkFontChooserWidget *self)
{
if (gtk_single_selection_get_selected_item (self->selection))
return self->font_desc;
return NULL;
}
static void
gtk_font_chooser_widget_set_font (GtkFontChooserWidget *fontchooser,
const char *fontname)
{
PangoFontDescription *font_desc;
font_desc = pango_font_description_from_string (fontname);
gtk_font_chooser_widget_take_font_desc (fontchooser, font_desc);
}
/* OpenType variations */
static void
add_font_variations (GtkFontChooserWidget *fontchooser,
GString *s)
{
GHashTableIter iter;
Axis *axis;
const char *sep = "";
char buf[G_ASCII_DTOSTR_BUF_SIZE];
g_hash_table_iter_init (&iter, fontchooser->axes);
while (g_hash_table_iter_next (&iter, (gpointer *)NULL, (gpointer *)&axis))
{
char tag[5];
double value;
tag[0] = (axis->tag >> 24) & 0xff;
tag[1] = (axis->tag >> 16) & 0xff;
tag[2] = (axis->tag >> 8) & 0xff;
tag[3] = (axis->tag >> 0) & 0xff;
tag[4] = '\0';
value = gtk_adjustment_get_value (axis->adjustment);
g_string_append_printf (s, "%s%s=%s", sep, tag, g_ascii_dtostr (buf, sizeof(buf), value));
sep = ",";
}
}
static void
adjustment_changed (GtkAdjustment *adjustment,
Axis *axis)
{
GtkFontChooserWidget *fontchooser = GTK_FONT_CHOOSER_WIDGET (axis->fontchooser);
PangoFontDescription *font_desc;
GString *s;
fontchooser->updating_variations = TRUE;
s = g_string_new ("");
add_font_variations (fontchooser, s);
if (s->len > 0)
{
font_desc = pango_font_description_new ();
pango_font_description_set_variations (font_desc, s->str);
gtk_font_chooser_widget_take_font_desc (fontchooser, font_desc);
}
g_string_free (s, TRUE);
fontchooser->updating_variations = FALSE;
}
static gboolean
should_show_axis (hb_ot_var_axis_info_t *ax)
{
if (ax->flags & HB_OT_VAR_AXIS_FLAG_HIDDEN)
return FALSE;
return TRUE;
}
static gboolean
is_named_instance (hb_font_t *font)
{
/* FIXME */
return FALSE;
}
static struct {
guint32 tag;
const char *name;
} axis_names[] = {
{ HB_OT_TAG_VAR_AXIS_WIDTH, N_("Width") },
{ HB_OT_TAG_VAR_AXIS_WEIGHT, N_("Weight") },
{ HB_OT_TAG_VAR_AXIS_ITALIC, N_("Italic") },
{ HB_OT_TAG_VAR_AXIS_SLANT, N_("Slant") },
{ HB_OT_TAG_VAR_AXIS_OPTICAL_SIZE, N_("Optical Size") },
};
static gboolean
add_axis (GtkFontChooserWidget *fontchooser,
hb_font_t *hb_font,
hb_ot_var_axis_info_t *ax,
int value,
int row)
{
hb_face_t *hb_face;
Axis *axis;
const char *name;
char buffer[20];
unsigned int buffer_len = 20;
int i;
hb_face = hb_font_get_face (hb_font);
axis = g_new (Axis, 1);
axis->tag = ax->tag;
axis->fontchooser = GTK_WIDGET (fontchooser);
hb_ot_name_get_utf8 (hb_face, ax->name_id, HB_LANGUAGE_INVALID, &buffer_len, buffer);
name = buffer;
for (i = 0; i < G_N_ELEMENTS (axis_names); i++)
{
if (axis_names[i].tag == ax->tag)
{
name = _(axis_names[i].name);
break;
}
}
axis->label = gtk_label_new (name);
gtk_widget_set_halign (axis->label, GTK_ALIGN_START);
gtk_widget_set_valign (axis->label, GTK_ALIGN_BASELINE);
gtk_grid_attach (GTK_GRID (fontchooser->axis_grid), axis->label, 0, row, 1, 1);
axis->adjustment = gtk_adjustment_new ((double)value,
(double)ax->min_value,
(double)ax->max_value,
1.0, 10.0, 0.0);
axis->scale = gtk_scale_new (GTK_ORIENTATION_HORIZONTAL, axis->adjustment);
gtk_scale_add_mark (GTK_SCALE (axis->scale), (double)ax->default_value, GTK_POS_TOP, NULL);
gtk_widget_set_valign (axis->scale, GTK_ALIGN_BASELINE);
gtk_widget_set_hexpand (axis->scale, TRUE);
gtk_widget_set_size_request (axis->scale, 100, -1);
gtk_scale_set_draw_value (GTK_SCALE (axis->scale), FALSE);
gtk_grid_attach (GTK_GRID (fontchooser->axis_grid), axis->scale, 1, row, 1, 1);
axis->spin = gtk_spin_button_new (axis->adjustment, 0, 0);
g_signal_connect (axis->spin, "output", G_CALLBACK (output_cb), fontchooser);
gtk_widget_set_valign (axis->spin, GTK_ALIGN_BASELINE);
gtk_grid_attach (GTK_GRID (fontchooser->axis_grid), axis->spin, 2, row, 1, 1);
g_hash_table_add (fontchooser->axes, axis);
adjustment_changed (axis->adjustment, axis);
g_signal_connect (axis->adjustment, "value-changed", G_CALLBACK (adjustment_changed), axis);
if (is_named_instance (hb_font) || !should_show_axis (ax))
{
gtk_widget_hide (axis->label);
gtk_widget_hide (axis->scale);
gtk_widget_hide (axis->spin);
return FALSE;
}
return TRUE;
}
/* FIXME: This doesn't work if the font has an avar table */
static float
denorm_coord (hb_ot_var_axis_info_t *axis, int coord)
{
float r = coord / 16384.0;
if (coord < 0)
return axis->default_value + r * (axis->default_value - axis->min_value);
else
return axis->default_value + r * (axis->max_value - axis->default_value);
}
static gboolean
gtk_font_chooser_widget_update_font_variations (GtkFontChooserWidget *fontchooser)
{
PangoFont *pango_font;
hb_font_t *hb_font;
hb_face_t *hb_face;
const int *coords;
unsigned int n_coords;
unsigned int n_axes;
hb_ot_var_axis_info_t *axes;
gboolean has_axis = FALSE;
int i;
if (fontchooser->updating_variations)
return FALSE;
g_hash_table_foreach (fontchooser->axes, axis_remove, fontchooser);
g_hash_table_remove_all (fontchooser->axes);
if ((fontchooser->level & GTK_FONT_CHOOSER_LEVEL_VARIATIONS) == 0)
return FALSE;
pango_font = pango_context_load_font (gtk_widget_get_pango_context (GTK_WIDGET (fontchooser)),
fontchooser->font_desc);
hb_font = pango_font_get_hb_font (pango_font);
hb_face = hb_font_get_face (hb_font);
if (!hb_ot_var_has_data (hb_face))
return FALSE;
coords = hb_font_get_var_coords_normalized (hb_font, &n_coords);
n_axes = hb_ot_var_get_axis_count (hb_face);
axes = g_new0 (hb_ot_var_axis_info_t, n_axes);
hb_ot_var_get_axis_infos (hb_face, 0, &n_axes, axes);
for (i = 0; i < n_axes; i++)
{
float value;
if (coords && i < n_coords)
value = denorm_coord (&axes[i], coords[i]);
else
value = axes[i].default_value;
if (add_axis (fontchooser, hb_font, &axes[i], value, i + 4))
has_axis = TRUE;
}
g_free (axes);
g_object_unref (pango_font);
return has_axis;
}
/* OpenType features */
/* look for a lang / script combination that matches the
* language property and is supported by the hb_face. If
* none is found, return the default lang / script tags.
*/
static void
find_language_and_script (GtkFontChooserWidget *fontchooser,
hb_face_t *hb_face,
hb_tag_t *lang_tag,
hb_tag_t *script_tag)
{
int i, j, k;
hb_tag_t scripts[80];
unsigned int n_scripts;
unsigned int count;
hb_tag_t table[2] = { HB_OT_TAG_GSUB, HB_OT_TAG_GPOS };
hb_language_t lang;
const char *langname, *p;
langname = pango_language_to_string (fontchooser->language);
p = strchr (langname, '-');
lang = hb_language_from_string (langname, p ? p - langname : -1);
n_scripts = 0;
for (i = 0; i < 2; i++)
{
count = G_N_ELEMENTS (scripts);
hb_ot_layout_table_get_script_tags (hb_face, table[i], n_scripts, &count, scripts);
n_scripts += count;
}
for (j = 0; j < n_scripts; j++)
{
hb_tag_t languages[80];
unsigned int n_languages;
n_languages = 0;
for (i = 0; i < 2; i++)
{
count = G_N_ELEMENTS (languages);
hb_ot_layout_script_get_language_tags (hb_face, table[i], j, n_languages, &count, languages);
n_languages += count;
}
for (k = 0; k < n_languages; k++)
{
if (lang == hb_ot_tag_to_language (languages[k]))
{
*script_tag = scripts[j];
*lang_tag = languages[k];
return;
}
}
}
*lang_tag = HB_OT_TAG_DEFAULT_LANGUAGE;
*script_tag = HB_OT_TAG_DEFAULT_SCRIPT;
}
typedef struct {
hb_tag_t tag;
const char *name;
GtkWidget *top;
GtkWidget *feat;
GtkWidget *example;
} FeatureItem;
static const char *
get_feature_display_name (hb_tag_t tag)
{
int i;
for (i = 0; i < G_N_ELEMENTS (open_type_layout_features); i++)
{
if (tag == open_type_layout_features[i].tag)
return g_dpgettext2 (NULL, "OpenType layout", open_type_layout_features[i].name);
}
return NULL;
}
static void
set_inconsistent (GtkCheckButton *button,
gboolean inconsistent)
{
gtk_check_button_set_inconsistent (GTK_CHECK_BUTTON (button), inconsistent);
gtk_widget_set_opacity (gtk_widget_get_first_child (GTK_WIDGET (button)), inconsistent ? 0.0 : 1.0);
}
static void
feat_clicked (GtkWidget *feat,
gpointer data)
{
g_signal_handlers_block_by_func (feat, feat_clicked, NULL);
if (gtk_check_button_get_inconsistent (GTK_CHECK_BUTTON (feat)))
{
set_inconsistent (GTK_CHECK_BUTTON (feat), FALSE);
gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (feat), TRUE);
}
g_signal_handlers_unblock_by_func (feat, feat_clicked, NULL);
}
static void
feat_pressed (GtkGesture *gesture,
int n_press,
double x,
double y,
GtkWidget *feat)
{
gboolean inconsistent;
inconsistent = gtk_check_button_get_inconsistent (GTK_CHECK_BUTTON (feat));
set_inconsistent (GTK_CHECK_BUTTON (feat), !inconsistent);
}
static char *
find_affected_text (hb_tag_t feature_tag,
hb_font_t *hb_font,
hb_tag_t script_tag,
hb_tag_t lang_tag,
int max_chars)
{
hb_face_t *hb_face;
unsigned int script_index = 0;
unsigned int lang_index = 0;
unsigned int feature_index = 0;
GString *chars;
hb_face = hb_font_get_face (hb_font);
chars = g_string_new ("");
hb_ot_layout_table_find_script (hb_face, HB_OT_TAG_GSUB, script_tag, &script_index);
G_GNUC_BEGIN_IGNORE_DEPRECATIONS
hb_ot_layout_script_find_language (hb_face, HB_OT_TAG_GSUB, script_index, lang_tag, &lang_index);
G_GNUC_END_IGNORE_DEPRECATIONS
if (hb_ot_layout_language_find_feature (hb_face, HB_OT_TAG_GSUB, script_index, lang_index, feature_tag, &feature_index))
{
unsigned int lookup_indexes[32];
unsigned int lookup_count = 32;
int count;
int n_chars = 0;
count = hb_ot_layout_feature_get_lookups (hb_face,
HB_OT_TAG_GSUB,
feature_index,
0,
&lookup_count,
lookup_indexes);
if (count > 0)
{
hb_set_t* glyphs_before = NULL;
hb_set_t* glyphs_input = NULL;
hb_set_t* glyphs_after = NULL;
hb_set_t* glyphs_output = NULL;
hb_codepoint_t gid;
glyphs_input = hb_set_create ();
// XXX For now, just look at first index
hb_ot_layout_lookup_collect_glyphs (hb_face,
HB_OT_TAG_GSUB,
lookup_indexes[0],
glyphs_before,
glyphs_input,
glyphs_after,
glyphs_output);
gid = -1;
while (hb_set_next (glyphs_input, &gid)) {
hb_codepoint_t ch;
if (n_chars == max_chars)
{
g_string_append (chars, "…");
break;
}
for (ch = 0; ch < 0xffff; ch++) {
hb_codepoint_t glyph = 0;
hb_font_get_nominal_glyph (hb_font, ch, &glyph);
if (glyph == gid) {
g_string_append_unichar (chars, (gunichar)ch);
n_chars++;
break;
}
}
}
hb_set_destroy (glyphs_input);
}
}
return g_string_free (chars, FALSE);
}
static void
update_feature_example (FeatureItem *item,
hb_font_t *hb_font,
hb_tag_t script_tag,
hb_tag_t lang_tag,
PangoFontDescription *font_desc)
{
const char *letter_case[] = { "smcp", "c2sc", "pcap", "c2pc", "unic", "cpsp", "case", NULL };
const char *number_case[] = { "xxxx", "lnum", "onum", NULL };
const char *number_spacing[] = { "xxxx", "pnum", "tnum", NULL };
const char *number_formatting[] = { "zero", "nalt", "frac", NULL };
const char *char_variants[] = {
"swsh", "cswh", "calt", "falt", "hist", "salt", "jalt", "titl", "rand",
"ss01", "ss02", "ss03", "ss04", "ss05", "ss06", "ss07", "ss08", "ss09", "ss10",
"ss11", "ss12", "ss13", "ss14", "ss15", "ss16", "ss17", "ss18", "ss19", "ss20",
NULL };
if (g_strv_contains (number_case, item->name) ||
g_strv_contains (number_spacing, item->name))
{
PangoAttrList *attrs;
PangoAttribute *attr;
PangoFontDescription *desc;
char *str;
attrs = pango_attr_list_new ();
desc = pango_font_description_copy (font_desc);
pango_font_description_unset_fields (desc, PANGO_FONT_MASK_SIZE);
pango_attr_list_insert (attrs, pango_attr_font_desc_new (desc));
pango_font_description_free (desc);
str = g_strconcat (item->name, " 1", NULL);
attr = pango_attr_font_features_new (str);
pango_attr_list_insert (attrs, attr);
gtk_label_set_text (GTK_LABEL (item->example), "0123456789");
gtk_label_set_attributes (GTK_LABEL (item->example), attrs);
pango_attr_list_unref (attrs);
}
else if (g_strv_contains (letter_case, item->name) ||
g_strv_contains (number_formatting, item->name) ||
g_strv_contains (char_variants, item->name))
{
char *input = NULL;
char *text;
if (strcmp (item->name, "case") == 0)
input = g_strdup ("A-B[Cq]");
else if (g_strv_contains (letter_case, item->name))
input = g_strdup ("AaBbCc…");
else if (strcmp (item->name, "zero") == 0)
input = g_strdup ("0");
else if (strcmp (item->name, "frac") == 0)
input = g_strdup ("1/2 2/3 7/8");
else if (strcmp (item->name, "nalt") == 0)
input = find_affected_text (item->tag, hb_font, script_tag, lang_tag, 3);
else
input = find_affected_text (item->tag, hb_font, script_tag, lang_tag, 10);
if (input[0] != '\0')
{
PangoAttrList *attrs;
PangoAttribute *attr;
PangoFontDescription *desc;
char *str;
text = g_strconcat (input, " ⟶ ", input, NULL);
attrs = pango_attr_list_new ();
desc = pango_font_description_copy (font_desc);
pango_font_description_unset_fields (desc, PANGO_FONT_MASK_SIZE);
pango_attr_list_insert (attrs, pango_attr_font_desc_new (desc));
pango_font_description_free (desc);
str = g_strconcat (item->name, " 0", NULL);
attr = pango_attr_font_features_new (str);
attr->start_index = 0;
attr->end_index = strlen (input);
pango_attr_list_insert (attrs, attr);
str = g_strconcat (item->name, " 1", NULL);
attr = pango_attr_font_features_new (str);
attr->start_index = strlen (input) + strlen (" ⟶ ");
attr->end_index = attr->start_index + strlen (input);
pango_attr_list_insert (attrs, attr);
gtk_label_set_text (GTK_LABEL (item->example), text);
gtk_label_set_attributes (GTK_LABEL (item->example), attrs);
g_free (text);
pango_attr_list_unref (attrs);
}
else
gtk_label_set_markup (GTK_LABEL (item->example), "");
g_free (input);
}
}
static void
add_check_group (GtkFontChooserWidget *fontchooser,
const char *title,
const char **tags)
{
GtkWidget *label;
GtkWidget *group;
PangoAttrList *attrs;
int i;
group = gtk_box_new (GTK_ORIENTATION_VERTICAL, 0);
gtk_widget_set_halign (group, GTK_ALIGN_FILL);
label = gtk_label_new (title);
gtk_label_set_xalign (GTK_LABEL (label), 0.0);
gtk_widget_set_halign (label, GTK_ALIGN_START);
g_object_set (label, "margin-top", 10, "margin-bottom", 10, NULL);
attrs = pango_attr_list_new ();
pango_attr_list_insert (attrs, pango_attr_weight_new (PANGO_WEIGHT_BOLD));
gtk_label_set_attributes (GTK_LABEL (label), attrs);
pango_attr_list_unref (attrs);
gtk_box_append (GTK_BOX (group), label);
for (i = 0; tags[i]; i++)
{
hb_tag_t tag;
GtkWidget *feat;
FeatureItem *item;
GtkGesture *gesture;
GtkWidget *box;
GtkWidget *example;
tag = hb_tag_from_string (tags[i], -1);
feat = gtk_check_button_new_with_label (get_feature_display_name (tag));
set_inconsistent (GTK_CHECK_BUTTON (feat), TRUE);
g_signal_connect_swapped (feat, "notify::active", G_CALLBACK (update_font_features), fontchooser);
g_signal_connect_swapped (feat, "notify::inconsistent", G_CALLBACK (update_font_features), fontchooser);
g_signal_connect (feat, "clicked", G_CALLBACK (feat_clicked), NULL);
gesture = gtk_gesture_click_new ();
gtk_gesture_single_set_button (GTK_GESTURE_SINGLE (gesture), GDK_BUTTON_SECONDARY);
g_signal_connect (gesture, "pressed", G_CALLBACK (feat_pressed), feat);
gtk_widget_add_controller (feat, GTK_EVENT_CONTROLLER (gesture));
example = gtk_label_new ("");
gtk_label_set_selectable (GTK_LABEL (example), TRUE);
gtk_widget_set_halign (example, GTK_ALIGN_START);
box = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 10);
gtk_box_set_homogeneous (GTK_BOX (box), TRUE);
gtk_box_append (GTK_BOX (box), feat);
gtk_box_append (GTK_BOX (box), example);
gtk_box_append (GTK_BOX (group), box);
item = g_new (FeatureItem, 1);
item->name = tags[i];
item->tag = tag;
item->top = box;
item->feat = feat;
item->example = example;
fontchooser->feature_items = g_list_prepend (fontchooser->feature_items, item);
}
gtk_box_append (GTK_BOX (fontchooser->feature_box), group);
}
static void
add_radio_group (GtkFontChooserWidget *fontchooser,
const char *title,
const char **tags)
{
GtkWidget *label;
GtkWidget *group;
int i;
GtkWidget *group_button = NULL;
PangoAttrList *attrs;
group = gtk_box_new (GTK_ORIENTATION_VERTICAL, 0);
gtk_widget_set_halign (group, GTK_ALIGN_FILL);
label = gtk_label_new (title);
gtk_label_set_xalign (GTK_LABEL (label), 0.0);
gtk_widget_set_halign (label, GTK_ALIGN_START);
g_object_set (label, "margin-top", 10, "margin-bottom", 10, NULL);
attrs = pango_attr_list_new ();
pango_attr_list_insert (attrs, pango_attr_weight_new (PANGO_WEIGHT_BOLD));
gtk_label_set_attributes (GTK_LABEL (label), attrs);
pango_attr_list_unref (attrs);
gtk_box_append (GTK_BOX (group), label);
for (i = 0; tags[i]; i++)
{
hb_tag_t tag;
GtkWidget *feat;
FeatureItem *item;
const char *name;
GtkWidget *box;
GtkWidget *example;
tag = hb_tag_from_string (tags[i], -1);
name = get_feature_display_name (tag);
feat = gtk_radio_button_new_with_label_from_widget (GTK_RADIO_BUTTON (group_button),
name ? name : _("Default"));
if (group_button == NULL)
group_button = feat;
g_signal_connect_swapped (feat, "notify::active", G_CALLBACK (update_font_features), fontchooser);
g_object_set_data (G_OBJECT (feat), "default", group_button);
example = gtk_label_new ("");
gtk_label_set_selectable (GTK_LABEL (example), TRUE);
gtk_widget_set_halign (example, GTK_ALIGN_START);
box = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 10);
gtk_box_set_homogeneous (GTK_BOX (box), TRUE);
gtk_box_append (GTK_BOX (box), feat);
gtk_box_append (GTK_BOX (box), example);
gtk_box_append (GTK_BOX (group), box);
item = g_new (FeatureItem, 1);
item->name = tags[i];
item->tag = tag;
item->top = box;
item->feat = feat;
item->example = example;
fontchooser->feature_items = g_list_prepend (fontchooser->feature_items, item);
}
gtk_box_append (GTK_BOX (fontchooser->feature_box), group);
}
static void
gtk_font_chooser_widget_populate_features (GtkFontChooserWidget *fontchooser)
{
const char *ligatures[] = { "liga", "dlig", "hlig", "clig", NULL };
const char *letter_case[] = { "smcp", "c2sc", "pcap", "c2pc", "unic", "cpsp", "case", NULL };
const char *number_case[] = { "xxxx", "lnum", "onum", NULL };
const char *number_spacing[] = { "xxxx", "pnum", "tnum", NULL };
const char *number_formatting[] = { "zero", "nalt", "frac", NULL };
const char *char_variants[] = {
"swsh", "cswh", "calt", "falt", "hist", "salt", "jalt", "titl", "rand",
"ss01", "ss02", "ss03", "ss04", "ss05", "ss06", "ss07", "ss08", "ss09", "ss10",
"ss11", "ss12", "ss13", "ss14", "ss15", "ss16", "ss17", "ss18", "ss19", "ss20",
NULL };
add_check_group (fontchooser, _("Ligatures"), ligatures);
add_check_group (fontchooser, _("Letter Case"), letter_case);
add_radio_group (fontchooser, _("Number Case"), number_case);
add_radio_group (fontchooser, _("Number Spacing"), number_spacing);
add_check_group (fontchooser, _("Number Formatting"), number_formatting);
add_check_group (fontchooser, _("Character Variants"), char_variants);
update_font_features (fontchooser);
}
static gboolean
gtk_font_chooser_widget_update_font_features (GtkFontChooserWidget *fontchooser)
{
PangoFont *pango_font;
hb_font_t *hb_font;
hb_tag_t script_tag;
hb_tag_t lang_tag;
guint script_index = 0;
guint lang_index = 0;
int i, j;
GList *l;
gboolean has_feature = FALSE;
for (l = fontchooser->feature_items; l; l = l->next)
{
FeatureItem *item = l->data;
gtk_widget_hide (item->top);
gtk_widget_hide (gtk_widget_get_parent (item->top));
}
if ((fontchooser->level & GTK_FONT_CHOOSER_LEVEL_FEATURES) == 0)
return FALSE;
pango_font = pango_context_load_font (gtk_widget_get_pango_context (GTK_WIDGET (fontchooser)),
fontchooser->font_desc);
hb_font = pango_font_get_hb_font (pango_font);
if (hb_font)
{
hb_tag_t table[2] = { HB_OT_TAG_GSUB, HB_OT_TAG_GPOS };
hb_face_t *hb_face;
hb_tag_t features[80];
unsigned int count;
unsigned int n_features;
hb_face = hb_font_get_face (hb_font);
find_language_and_script (fontchooser, hb_face, &lang_tag, &script_tag);
n_features = 0;
for (i = 0; i < 2; i++)
{
hb_ot_layout_table_find_script (hb_face, table[i], script_tag, &script_index);
G_GNUC_BEGIN_IGNORE_DEPRECATIONS
hb_ot_layout_script_find_language (hb_face, table[i], script_index, lang_tag, &lang_index);
G_GNUC_END_IGNORE_DEPRECATIONS
count = G_N_ELEMENTS (features);
hb_ot_layout_language_get_feature_tags (hb_face,
table[i],
script_index,
lang_index,
n_features,
&count,
features);
n_features += count;
}
for (j = 0; j < n_features; j++)
{
for (l = fontchooser->feature_items; l; l = l->next)
{
FeatureItem *item = l->data;
if (item->tag != features[j])
continue;
has_feature = TRUE;
gtk_widget_show (item->top);
gtk_widget_show (gtk_widget_get_parent (item->top));
update_feature_example (item, hb_font, script_tag, lang_tag, fontchooser->font_desc);
if (GTK_IS_RADIO_BUTTON (item->feat))
{
GtkWidget *def = GTK_WIDGET (g_object_get_data (G_OBJECT (item->feat), "default"));
gtk_widget_show (gtk_widget_get_parent (def));
}
else if (GTK_IS_CHECK_BUTTON (item->feat))
{
set_inconsistent (GTK_CHECK_BUTTON (item->feat), TRUE);
}
}
}
}
g_object_unref (pango_font);
return has_feature;
}
static void
update_font_features (GtkFontChooserWidget *fontchooser)
{
GString *s;
GList *l;
s = g_string_new ("");
for (l = fontchooser->feature_items; l; l = l->next)
{
FeatureItem *item = l->data;
if (!gtk_widget_is_sensitive (item->feat))
continue;
if (GTK_IS_RADIO_BUTTON (item->feat))
{
if (gtk_toggle_button_get_active (GTK_TOGGLE_BUTTON (item->feat)) &&
strcmp (item->name, "xxxx") != 0)
{
g_string_append_printf (s, "%s\"%s\" %d", s->len > 0 ? ", " : "", item->name, 1);
}
}
else if (GTK_IS_CHECK_BUTTON (item->feat))
{
if (gtk_check_button_get_inconsistent (GTK_CHECK_BUTTON (item->feat)))
continue;
g_string_append_printf (s, "%s\"%s\" %d",
s->len > 0 ? ", " : "", item->name,
gtk_toggle_button_get_active (GTK_TOGGLE_BUTTON (item->feat)));
}
}
if (g_strcmp0 (fontchooser->font_features, s->str) != 0)
{
g_free (fontchooser->font_features);
fontchooser->font_features = g_string_free (s, FALSE);
g_object_notify (G_OBJECT (fontchooser), "font-features");
}
else
g_string_free (s, TRUE);
gtk_font_chooser_widget_update_preview_attributes (fontchooser);
}
static void
gtk_font_chooser_widget_merge_font_desc (GtkFontChooserWidget *fontchooser,
const PangoFontDescription *font_desc)
{
PangoFontMask mask;
g_assert (font_desc != NULL);
/* iter may be NULL if the font doesn't exist on the list */
mask = pango_font_description_get_set_fields (font_desc);
/* sucky test, because we can't restrict the comparison to
* only the parts that actually do get merged */
if (pango_font_description_equal (font_desc, fontchooser->font_desc))
return;
pango_font_description_merge (fontchooser->font_desc, font_desc, TRUE);
if (mask & PANGO_FONT_MASK_SIZE)
{
double font_size = (double) pango_font_description_get_size (fontchooser->font_desc) / PANGO_SCALE;
/* XXX: This clamps, which can cause it to reloop into here, do we need
* to block its signal handler? */
gtk_range_set_value (GTK_RANGE (fontchooser->size_slider), font_size);
gtk_spin_button_set_value (GTK_SPIN_BUTTON (fontchooser->size_spin), font_size);
}
if (mask & (PANGO_FONT_MASK_FAMILY | PANGO_FONT_MASK_STYLE | PANGO_FONT_MASK_VARIANT |
PANGO_FONT_MASK_WEIGHT | PANGO_FONT_MASK_STRETCH))
{
gboolean has_tweak = FALSE;
gtk_font_chooser_widget_update_marks (fontchooser);
if (gtk_font_chooser_widget_update_font_features (fontchooser))
has_tweak = TRUE;
if (gtk_font_chooser_widget_update_font_variations (fontchooser))
has_tweak = TRUE;
g_simple_action_set_enabled (G_SIMPLE_ACTION (fontchooser->tweak_action), has_tweak);
}
gtk_font_chooser_widget_update_preview_attributes (fontchooser);
g_object_notify (G_OBJECT (fontchooser), "font");
g_object_notify (G_OBJECT (fontchooser), "font-desc");
}
static void
gtk_font_chooser_widget_take_font_desc (GtkFontChooserWidget *fontchooser,
PangoFontDescription *font_desc)
{
PangoFontMask mask;
if (font_desc == NULL)
font_desc = pango_font_description_from_string (GTK_FONT_CHOOSER_DEFAULT_FONT_NAME);
mask = pango_font_description_get_set_fields (font_desc);
gtk_font_chooser_widget_merge_font_desc (fontchooser, font_desc);
if (mask & (PANGO_FONT_MASK_FAMILY | PANGO_FONT_MASK_STYLE | PANGO_FONT_MASK_VARIANT |
PANGO_FONT_MASK_WEIGHT | PANGO_FONT_MASK_STRETCH))
{
gtk_font_chooser_widget_ensure_matching_selection (fontchooser);
}
pango_font_description_free (font_desc);
}
static const char *
gtk_font_chooser_widget_get_preview_text (GtkFontChooserWidget *fontchooser)
{
return fontchooser->preview_text;
}
static void
gtk_font_chooser_widget_set_preview_text (GtkFontChooserWidget *fontchooser,
const char *text)
{
g_free (fontchooser->preview_text);
fontchooser->preview_text = g_strdup (text);
gtk_editable_set_text (GTK_EDITABLE (fontchooser->preview), text);
g_object_notify (G_OBJECT (fontchooser), "preview-text");
}
static gboolean
gtk_font_chooser_widget_get_show_preview_entry (GtkFontChooserWidget *fontchooser)
{
return fontchooser->show_preview_entry;
}
static void
gtk_font_chooser_widget_set_show_preview_entry (GtkFontChooserWidget *fontchooser,
gboolean show_preview_entry)
{
if (fontchooser->show_preview_entry != show_preview_entry)
{
fontchooser->show_preview_entry = show_preview_entry;
if (show_preview_entry)
gtk_widget_show (fontchooser->preview);
else
gtk_widget_hide (fontchooser->preview);
g_object_notify (G_OBJECT (fontchooser), "show-preview-entry");
}
}
static void
gtk_font_chooser_widget_set_font_map (GtkFontChooser *chooser,
PangoFontMap *fontmap)
{
GtkFontChooserWidget *fontchooser = GTK_FONT_CHOOSER_WIDGET (chooser);
if (g_set_object (&fontchooser->font_map, fontmap))
{
PangoContext *context;
if (!fontmap)
fontmap = pango_cairo_font_map_get_default ();
context = gtk_widget_get_pango_context (fontchooser->family_face_list);
pango_context_set_font_map (context, fontmap);
context = gtk_widget_get_pango_context (fontchooser->preview);
pango_context_set_font_map (context, fontmap);
update_fontlist (fontchooser);
}
}
static PangoFontMap *
gtk_font_chooser_widget_get_font_map (GtkFontChooser *chooser)
{
GtkFontChooserWidget *fontchooser = GTK_FONT_CHOOSER_WIDGET (chooser);
return fontchooser->font_map;
}
static gboolean
gtk_font_chooser_widget_filter_cb (gpointer item,
gpointer data)
{
GtkFontChooserWidget *self = GTK_FONT_CHOOSER_WIDGET (data);
PangoFontFamily *family;
PangoFontFace *face;
if (PANGO_IS_FONT_FAMILY (item))
{
family = item;
face = pango_font_family_get_face (family, NULL);
}
else
{
face = item;
family = pango_font_face_get_family (face);
}
return self->filter_func (family, face, self->filter_data);
}
static void
gtk_font_chooser_widget_set_filter_func (GtkFontChooser *chooser,
GtkFontFilterFunc filter,
gpointer data,
GDestroyNotify destroy)
{
GtkFontChooserWidget *self = GTK_FONT_CHOOSER_WIDGET (chooser);
if (self->filter_data_destroy)
self->filter_data_destroy (self->filter_data);
self->filter_func = filter;
self->filter_data = data;
self->filter_data_destroy = destroy;
if (filter)
{
gtk_custom_filter_set_filter_func (self->custom_filter,
gtk_font_chooser_widget_filter_cb,
self,
NULL);
}
else
{
gtk_custom_filter_set_filter_func (self->custom_filter, NULL, NULL, NULL);
}
}
static void
gtk_font_chooser_widget_set_level (GtkFontChooserWidget *fontchooser,
GtkFontChooserLevel level)
{
if (fontchooser->level == level)
return;
fontchooser->level = level;
if ((level & GTK_FONT_CHOOSER_LEVEL_SIZE) != 0)
{
gtk_widget_show (fontchooser->size_label);
gtk_widget_show (fontchooser->size_slider);
gtk_widget_show (fontchooser->size_spin);
}
else
{
gtk_widget_hide (fontchooser->size_label);
gtk_widget_hide (fontchooser->size_slider);
gtk_widget_hide (fontchooser->size_spin);
}
update_fontlist (fontchooser);
g_object_notify (G_OBJECT (fontchooser), "level");
}
static GtkFontChooserLevel
gtk_font_chooser_widget_get_level (GtkFontChooserWidget *fontchooser)
{
return fontchooser->level;
}
static void
gtk_font_chooser_widget_set_language (GtkFontChooserWidget *fontchooser,
const char *language)
{
PangoLanguage *lang;
lang = pango_language_from_string (language);
if (fontchooser->language == lang)
return;
fontchooser->language = lang;
g_object_notify (G_OBJECT (fontchooser), "language");
gtk_font_chooser_widget_update_preview_attributes (fontchooser);
}
static void
gtk_font_chooser_widget_iface_init (GtkFontChooserIface *iface)
{
iface->get_font_family = gtk_font_chooser_widget_get_family;
iface->get_font_face = gtk_font_chooser_widget_get_face;
iface->get_font_size = gtk_font_chooser_widget_get_size;
iface->set_filter_func = gtk_font_chooser_widget_set_filter_func;
iface->set_font_map = gtk_font_chooser_widget_set_font_map;
iface->get_font_map = gtk_font_chooser_widget_get_font_map;
}
GAction *
gtk_font_chooser_widget_get_tweak_action (GtkWidget *widget)
{
GtkFontChooserWidget *fontchooser = GTK_FONT_CHOOSER_WIDGET (widget);
return fontchooser->tweak_action;
}
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