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Determine direction from language

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We can determine the direction to return here
without relying on translations, by using pango
and HarfBuzz apis to go
language -> script -> direction.
This commit is contained in:
Matthias Clasen 2023-01-02 15:19:42 -05:00
parent e126110ae0
commit 1f7783224b
1 changed files with 31 additions and 12 deletions
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43
gtk/gtkmain.c
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@ -48,6 +48,8 @@
#undef STRICT
#endif
#include <hb-glib.h>
#include <glib/gi18n-lib.h>
#include "gtkbox.h"
@ -781,20 +783,37 @@ gtk_is_initialized (void)
GtkTextDirection
gtk_get_locale_direction (void)
{
/* Translate to default:RTL if you want your widgets
* to be RTL, otherwise translate to default:LTR.
* Do *not* translate it to "predefinito:LTR", if it
* it isn't default:LTR or default:RTL it will not work
*/
char *e = _("default:LTR");
GtkTextDirection dir = GTK_TEXT_DIR_LTR;
PangoLanguage *language;
const PangoScript *scripts;
int n_scripts;
if (g_strcmp0 (e, "default:RTL") == 0)
dir = GTK_TEXT_DIR_RTL;
else if (g_strcmp0 (e, "default:LTR") != 0)
g_warning ("Whoever translated default:LTR did so wrongly. Defaulting to LTR.");
language = gtk_get_default_language ();
scripts = pango_language_get_scripts (language, &n_scripts);
return dir;
if (n_scripts > 0)
{
for (int i = 0; i < n_scripts; i++)
{
hb_script_t script;
script = hb_glib_script_to_script ((GUnicodeScript) scripts[i]);
switch (hb_script_get_horizontal_direction (script))
{
case HB_DIRECTION_LTR:
return GTK_TEXT_DIR_LTR;
case HB_DIRECTION_RTL:
return GTK_TEXT_DIR_RTL;
case HB_DIRECTION_TTB:
case HB_DIRECTION_BTT:
case HB_DIRECTION_INVALID:
default:
break;
}
}
}
return GTK_TEXT_DIR_LTR;
}
/**