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gtk-demo: Beef up font features demo

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Some work on making this demo better.
This commit is contained in:
Matthias Clasen 2022-06-30 09:42:32 -04:00
parent 092fe2f712
commit e4781e393c
2 changed files with 278 additions and 16 deletions
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147
demos/gtk-demo/font-features.ui
View File

@ -1,5 +1,29 @@
<?xml version="1.0" encoding="UTF-8"?>
<interface>
<object class="GtkAdjustment" id="size_adjustment">
<property name="lower">7</property>
<property name="value">14</property>
<property name="step_increment">0.5</property>
<property name="page_increment">10</property>
<property name="upper">100</property>
<signal name="value-changed" handler="basic_value_changed" object="size_entry" swapped="false"/>
</object>
<object class="GtkAdjustment" id="letterspacing_adjustment">
<property name="lower">0</property>
<property name="value">0</property>
<property name="step_increment">1</property>
<property name="page_increment">512</property>
<property name="upper">10240</property>
<signal name="value-changed" handler="basic_value_changed" object="letterspacing_entry" swapped="false"/>
</object>
<object class="GtkAdjustment" id="line_height_adjustment">
<property name="lower">1</property>
<property name="value">1</property>
<property name="step_increment">0.1</property>
<property name="page_increment">1</property>
<property name="upper">3</property>
<signal name="value-changed" handler="basic_value_changed" object="line_height_entry" swapped="false"/>
</object>
<object class="GtkWindow" id="window">
<property name="default-width">600</property>
<property name="default-height">500</property>
@ -39,12 +63,129 @@
<signal name="font-set" handler="font_features_font_changed" swapped="no"/>
</object>
</child>
<child>
<object class="GtkGrid">
<property name="column-spacing">10</property>
<property name="row-spacing">10</property>
<child>
<object class="GtkLabel">
<property name="label">Size</property>
<property name="xalign">0</property>
<property name="valign">baseline</property>
<layout>
<property name="column">0</property>
<property name="row">0</property>
</layout>
</object>
</child>
<child>
<object class="GtkScale">
<property name="hexpand">1</property>
<property name="width-request">100</property>
<property name="valign">baseline</property>
<property name="adjustment">size_adjustment</property>
<layout>
<property name="column">1</property>
<property name="row">0</property>
</layout>
</object>
</child>
<child>
<object class="GtkEntry" id="size_entry">
<property name="width-chars">4</property>
<property name="max-width-chars">4</property>
<property name="hexpand">0</property>
<property name="valign">baseline</property>
<signal name="activate" handler="basic_entry_activated"
object="size_adjustment" swapped="false"/>
<layout>
<property name="column">2</property>
<property name="row">0</property>
</layout>
</object>
</child>
<child>
<object class="GtkLabel">
<property name="label">Letterspacing</property>
<property name="xalign">0</property>
<property name="valign">baseline</property>
<layout>
<property name="column">0</property>
<property name="row">1</property>
</layout>
</object>
</child>
<child>
<object class="GtkScale">
<property name="hexpand">1</property>
<property name="width-request">100</property>
<property name="valign">baseline</property>
<property name="adjustment">letterspacing_adjustment</property>
<layout>
<property name="column">1</property>
<property name="row">1</property>
</layout>
</object>
</child>
<child>
<object class="GtkEntry" id="letterspacing_entry">
<property name="width-chars">4</property>
<property name="max-width-chars">4</property>
<property name="hexpand">0</property>
<property name="valign">baseline</property>
<signal name="activate" handler="basic_entry_activated"
object="letterspacing_adjustment" swapped="false"/>
<layout>
<property name="column">2</property>
<property name="row">1</property>
</layout>
</object>
</child>
<child>
<object class="GtkLabel">
<property name="label">Line Height</property>
<property name="xalign">0</property>
<property name="valign">baseline</property>
<layout>
<property name="column">0</property>
<property name="row">2</property>
</layout>
</object>
</child>
<child>
<object class="GtkScale">
<property name="hexpand">1</property>
<property name="width-request">100</property>
<property name="valign">baseline</property>
<property name="adjustment">line_height_adjustment</property>
<layout>
<property name="column">1</property>
<property name="row">2</property>
</layout>
</object>
</child>
<child>
<object class="GtkEntry" id="line_height_entry">
<property name="width-chars">4</property>
<property name="max-width-chars">4</property>
<property name="hexpand">0</property>
<property name="valign">baseline</property>
<signal name="activate" handler="basic_entry_activated"
object="line_height_adjustment" swapped="false"/>
<layout>
<property name="column">2</property>
<property name="row">2</property>
</layout>
</object>
</child>
</object>
</child>
<child>
<object class="GtkExpander">
<child type="label">
<object class="GtkLabel">
<property name="xalign">0</property>
<property name="label" translatable="yes">Font Features</property>
<property name="label" translatable="yes">OpenType Features</property>
<attributes>
<attribute name="weight" value="bold"></attribute>
</attributes>
@ -55,6 +196,7 @@
<property name="orientation">vertical</property>
<child>
<object class="GtkComboBox" id="script_lang">
<property name="tooltip-text" translatable="yes">Language System</property>
<property name="margin-top">10</property>
<signal name="changed" handler="font_features_script_changed" swapped="no"/>
<child>
@ -73,7 +215,7 @@
<object class="GtkExpander">
<child type="label">
<object class="GtkLabel" id="variations_heading">
<property name="label" translatable="yes">Font Variations</property>
<property name="label" translatable="yes">Variation Axes</property>
<property name="xalign">0</property>
<attributes>
<attribute name="weight" value="bold"></attribute>
@ -162,6 +304,7 @@
<child>
<object class="GtkLabel" id="description">
<property name="wrap">1</property>
<property name="wrap-mode">char</property>
<property name="xalign">0</property>
<property name="valign">end</property>
<property name="width-chars">50</property>

147
demos/gtk-demo/font_features.c
View File

@ -36,6 +36,63 @@ static GtkWidget *variations_heading;
static GtkWidget *variations_grid;
static GtkWidget *instance_combo;
static GtkWidget *edit_toggle;
static GtkAdjustment *size_adjustment;
static GtkAdjustment *letterspacing_adjustment;
static GtkAdjustment *line_height_adjustment;
static GtkWidget *size_entry;
static GtkWidget *letterspacing_entry;
static GtkWidget *line_height_entry;
static void update_display (void);
typedef struct {
GtkAdjustment *adjustment;
GtkEntry *entry;
} BasicData;
static gboolean
update_in_idle (gpointer data)
{
BasicData *bd = data;
char *str;
str = g_strdup_printf ("%g", gtk_adjustment_get_value (bd->adjustment));
gtk_editable_set_text (GTK_EDITABLE (bd->entry), str);
g_free (str);
update_display ();
g_free (bd);
return G_SOURCE_REMOVE;
}
static void
basic_value_changed (GtkAdjustment *adjustment,
gpointer data)
{
BasicData *bd;
bd = g_new (BasicData, 1);
bd->adjustment = adjustment;
bd->entry = GTK_ENTRY (data);
g_idle_add (update_in_idle, bd);
}
static void
basic_entry_activated (GtkEntry *entry,
gpointer data)
{
GtkAdjustment *adjustment = data;
double value;
char *err = NULL;
value = g_strtod (gtk_editable_get_text (GTK_EDITABLE (entry)), &err);
if (err != NULL)
gtk_adjustment_set_value (adjustment, value);
}
typedef struct {
unsigned int tag;
@ -146,8 +203,6 @@ get_feature_display_name (unsigned int tag)
return buf;
}
static void update_display (void);
static void
set_inconsistent (GtkCheckButton *button,
gboolean inconsistent)
@ -325,6 +380,7 @@ update_display (void)
PangoLanguage *lang;
char *font_desc;
char *features;
double value;
text = gtk_editable_get_text (GTK_EDITABLE (the_entry));
@ -341,6 +397,9 @@ update_display (void)
desc = gtk_font_chooser_get_font_desc (GTK_FONT_CHOOSER (font));
value = gtk_adjustment_get_value (size_adjustment);
pango_font_description_set_size (desc, value * PANGO_SCALE);
s = g_string_new ("");
add_font_variations (s);
if (s->len > 0)
@ -412,6 +471,22 @@ update_display (void)
attrs = pango_attr_list_new ();
if (gtk_adjustment_get_value (letterspacing_adjustment) != 0.)
{
attr = pango_attr_letter_spacing_new (gtk_adjustment_get_value (letterspacing_adjustment));
attr->start_index = start;
attr->end_index = end;
pango_attr_list_insert (attrs, attr);
}
if (gtk_adjustment_get_value (line_height_adjustment) != 1.)
{
attr = pango_attr_line_height_new (gtk_adjustment_get_value (line_height_adjustment));
attr->start_index = start;
attr->end_index = end;
pango_attr_list_insert (attrs, attr);
}
for (l = ranges; l; l = l->next)
{
Range *range = l->data;
@ -532,6 +607,11 @@ update_script_combo (void)
tags = g_hash_table_new_full (tag_pair_hash, tag_pair_equal, g_free, NULL);
pair = g_new (TagPair, 1);
pair->script_tag = 0;
pair->lang_tag = 0;
g_hash_table_add (tags, pair);
pair = g_new (TagPair, 1);
pair->script_tag = HB_OT_TAG_DEFAULT_SCRIPT;
pair->lang_tag = HB_OT_TAG_DEFAULT_LANGUAGE;
@ -578,7 +658,9 @@ update_script_combo (void)
char langbuf[5];
GtkTreeIter tree_iter;
if (pair->lang_tag == HB_OT_TAG_DEFAULT_LANGUAGE)
if (pair->lang_tag == 0 && pair->script_tag == 0)
langname = NC_("Language", "None");
else if (pair->lang_tag == HB_OT_TAG_DEFAULT_LANGUAGE)
langname = NC_("Language", "Default");
else
{
@ -625,19 +707,11 @@ update_features (void)
GtkTreeModel *model;
GtkTreeIter iter;
guint script_index, lang_index;
hb_tag_t lang_tag;
PangoFont *pango_font;
hb_font_t *hb_font;
GList *l;
for (l = feature_items; l; l = l->next)
{
FeatureItem *item = l->data;
gtk_widget_hide (item->feat);
gtk_widget_hide (gtk_widget_get_parent (item->feat));
if (strcmp (item->name, "xxxx") == 0)
gtk_check_button_set_active (GTK_CHECK_BUTTON (item->feat), TRUE);
}
/* set feature presence checks from the font features */
if (!gtk_combo_box_get_active_iter (GTK_COMBO_BOX (script_lang), &iter))
@ -647,8 +721,32 @@ update_features (void)
gtk_tree_model_get (model, &iter,
1, &script_index,
2, &lang_index,
3, &lang_tag,
-1);
if (lang_tag == 0) /* None is selected */
{
for (l = feature_items; l; l = l->next)
{
FeatureItem *item = l->data;
gtk_widget_show (item->feat);
gtk_widget_show (gtk_widget_get_parent (item->feat));
if (strcmp (item->name, "xxxx") == 0)
gtk_check_button_set_active (GTK_CHECK_BUTTON (item->feat), TRUE);
}
return;
}
for (l = feature_items; l; l = l->next)
{
FeatureItem *item = l->data;
gtk_widget_hide (item->feat);
gtk_widget_hide (gtk_widget_get_parent (item->feat));
if (strcmp (item->name, "xxxx") == 0)
gtk_check_button_set_active (GTK_CHECK_BUTTON (item->feat), TRUE);
}
pango_font = get_pango_font ();
hb_font = pango_font_get_hb_font (pango_font);
@ -843,11 +941,12 @@ add_axis (hb_face_t *hb_face,
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 (variations_grid), axis_scale, 1, i, 1, 1);
axis_entry = gtk_entry_new ();
gtk_widget_set_valign (axis_entry, GTK_ALIGN_BASELINE);
gtk_editable_set_width_chars (GTK_EDITABLE (axis_entry), 4);
gtk_editable_set_max_width_chars (GTK_EDITABLE (axis_entry), 4);
gtk_widget_set_hexpand (axis_entry, FALSE);
gtk_grid_attach (GTK_GRID (variations_grid), axis_entry, 2, i, 1, 1);
axis = g_new (Axis, 1);
@ -1228,6 +1327,8 @@ entry_key_press (GtkEventController *controller,
return GDK_EVENT_PROPAGATE;
}
#define gtk_builder_cscope_add_callback(scope, callback) \
gtk_builder_cscope_add_callback_symbol (GTK_BUILDER_CSCOPE (scope), #callback, G_CALLBACK (callback))
GtkWidget *
do_font_features (GtkWidget *do_widget)
{
@ -1236,10 +1337,18 @@ do_font_features (GtkWidget *do_widget)
if (!window)
{
GtkBuilder *builder;
GtkBuilderScope *scope;
GtkWidget *feature_list;
GtkEventController *controller;
builder = gtk_builder_new_from_resource ("/font_features/font-features.ui");
builder = gtk_builder_new ();
scope = gtk_builder_cscope_new ();
gtk_builder_cscope_add_callback (scope, basic_value_changed);
gtk_builder_cscope_add_callback (scope, basic_entry_activated);
gtk_builder_set_scope (builder, scope);
gtk_builder_add_from_resource (builder, "/font_features/font-features.ui", NULL);
window = GTK_WIDGET (gtk_builder_get_object (builder, "window"));
feature_list = GTK_WIDGET (gtk_builder_get_object (builder, "feature_list"));
@ -1252,6 +1361,16 @@ do_font_features (GtkWidget *do_widget)
stack = GTK_WIDGET (gtk_builder_get_object (builder, "stack"));
the_entry = GTK_WIDGET (gtk_builder_get_object (builder, "entry"));
edit_toggle = GTK_WIDGET (gtk_builder_get_object (builder, "edit_toggle"));
size_entry = GTK_WIDGET (gtk_builder_get_object (builder, "size_entry"));
size_adjustment = GTK_ADJUSTMENT (gtk_builder_get_object (builder, "size_adjustment"));
letterspacing_entry = GTK_WIDGET (gtk_builder_get_object (builder, "letterspacing_entry"));
letterspacing_adjustment = GTK_ADJUSTMENT (gtk_builder_get_object (builder, "letterspacing_adjustment"));
line_height_entry = GTK_WIDGET (gtk_builder_get_object (builder, "line_height_entry"));
line_height_adjustment = GTK_ADJUSTMENT (gtk_builder_get_object (builder, "line_height_adjustment"));
basic_value_changed (size_adjustment, size_entry);
basic_value_changed (letterspacing_adjustment, letterspacing_entry);
basic_value_changed (line_height_adjustment, line_height_entry);
controller = gtk_event_controller_key_new ();
g_object_set_data_full (G_OBJECT (the_entry), "controller", g_object_ref (controller), g_object_unref);