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colorbutton: Improve accessibility

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Make the swatch not appear selectable, and
set an accessible label on it.
This commit is contained in:
Matthias Clasen 2020-10-21 23:54:09 -04:00
parent ba290eb9b0
commit e2b3cbac23
1 changed files with 37 additions and 2 deletions
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39
gtk/gtkcolorbutton.c
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@ -249,10 +249,13 @@ gtk_color_button_init (GtkColorButton *button)
g_signal_connect (button->button, "clicked", G_CALLBACK (gtk_color_button_clicked), button);
gtk_widget_set_parent (button->button, GTK_WIDGET (button));
button->swatch = gtk_color_swatch_new ();
button->swatch = g_object_new (GTK_TYPE_COLOR_SWATCH,
"accessible-role", GTK_ACCESSIBLE_ROLE_IMG,
"selectable", FALSE,
"has-menu", FALSE,
NULL);
gtk_widget_set_can_focus (button->swatch, FALSE);
gtk_widget_remove_css_class (button->swatch, "activatable");
g_object_set (button->swatch, "has-menu", FALSE, NULL);
layout = gtk_widget_create_pango_layout (GTK_WIDGET (button), "Black");
pango_layout_get_pixel_extents (layout, NULL, &rect);
g_object_unref (layout);
@ -437,11 +440,37 @@ gtk_color_button_clicked (GtkButton *b,
gtk_window_present (GTK_WINDOW (button->cs_dialog));
}
static guint
scale_round (double value,
double scale)
{
value = floor (value * scale + 0.5);
value = CLAMP (value, 0, scale);
return (guint)value;
}
static char *
accessible_color_name (const GdkRGBA *color)
{
if (color->alpha < 1.0)
return g_strdup_printf (_("Red %d%%, Green %d%%, Blue %d%%, Alpha %d%%"),
scale_round (color->red, 100),
scale_round (color->green, 100),
scale_round (color->blue, 100),
scale_round (color->alpha, 100));
else
return g_strdup_printf (_("Red %d%%, Green %d%%, Blue %d%%"),
scale_round (color->red, 100),
scale_round (color->green, 100),
scale_round (color->blue, 100));
}
static void
gtk_color_button_set_rgba (GtkColorChooser *chooser,
const GdkRGBA *rgba)
{
GtkColorButton *button = GTK_COLOR_BUTTON (chooser);
char *text;
g_return_if_fail (GTK_IS_COLOR_BUTTON (chooser));
g_return_if_fail (rgba != NULL);
@ -449,6 +478,12 @@ gtk_color_button_set_rgba (GtkColorChooser *chooser,
button->rgba = *rgba;
gtk_color_swatch_set_rgba (GTK_COLOR_SWATCH (button->swatch), &button->rgba);
text = accessible_color_name (rgba);
gtk_accessible_update_property (GTK_ACCESSIBLE (button->swatch),
GTK_ACCESSIBLE_PROPERTY_LABEL, text,
-1);
g_free (text);
g_object_notify (G_OBJECT (chooser), "rgba");
}