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Add fallbacks for GtkSwitch state labels

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While the IEC power symbols have been part of Unicode since version 9.0,
released in 2016, not every font supports them.

We can use the old symbols as a fallback, as they seem to have the
better coverage, if not the best appearance.
This commit is contained in:
Emmanuele Bassi
2019-01-15 15:22:09 +00:00
parent c9d09695f8
commit ed39721aa7
1 changed files with 39 additions and 2 deletions
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41
gtk/gtkswitch.c
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@@ -298,11 +298,48 @@ gtk_switch_create_pango_layouts (GtkSwitch *self)
{
GtkSwitchPrivate *priv = self->priv;
/* Glyphs for the ON state, in descending order of preference */
const char *on_glyphs[] = {
"⏽", /* U+23FD POWER ON SYMBOL */
"❙", /* U+2759 MEDIUM VERTICAL BAR */
};
/* Glyphs for the OFF state, in descending order of preference */
const char *off_glyphs[] = {
"⭘", /* U+2B58 HEAVY CIRCLE */
"○", /* U+25CB WHITE CIRCLE */
};
int i;
g_clear_object (&priv->on_layout);
priv->on_layout = gtk_widget_create_pango_layout (GTK_WIDGET (self), "⏽");
for (i = 0; i < G_N_ELEMENTS (on_glyphs); i++)
{
PangoLayout *layout = gtk_widget_create_pango_layout (GTK_WIDGET (self), on_glyphs[i]);
if (pango_layout_get_unknown_glyphs_count (layout) == 0)
{
priv->on_layout = layout;
break;
}
g_object_unref (layout);
}
g_clear_object (&priv->off_layout);
priv->off_layout = gtk_widget_create_pango_layout (GTK_WIDGET (self), "⭘");
for (i = 0; i < G_N_ELEMENTS (off_glyphs); i++)
{
PangoLayout *layout = gtk_widget_create_pango_layout (GTK_WIDGET (self), off_glyphs[i]);
if (pango_layout_get_unknown_glyphs_count (layout) == 0)
{
priv->off_layout = layout;
break;
}
g_object_unref (layout);
}
}
static void