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TextView: Get line direction in more efficient way

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We do not need to go through the heavyweight process of constructing a
TextLineDisplay just to get the direction out of it, when we can simply
use TextIter API to get the text and then get its direction using Pango.

Adapted from a patch by Mehdi Sadeghi for GtkSourceView:

https://bugzilla.gnome.org/show_bug.cgi?id=779081#c20
This commit is contained in:
Daniel Boles 2017-03-26 15:53:12 +01:00
parent 7be01e84c4
commit c78f6c804e
1 changed files with 14 additions and 8 deletions
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22
gtk/gtktextview.c
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@ -6344,15 +6344,21 @@ move_cursor (GtkTextView *text_view,
}
static gboolean
iter_line_is_rtl (GtkTextIter *iter, GtkTextLayout *layout)
iter_line_is_rtl (GtkTextIter *iter)
{
GtkTextLine *line = _gtk_text_iter_get_text_line (iter);
GtkTextLineDisplay *display = gtk_text_layout_get_line_display (layout, line, FALSE);
GtkTextDirection direction = display->direction;
GtkTextIter start, end;
char *text;
PangoDirection direction;
gtk_text_layout_free_line_display (layout, display);
start = end = *iter;
gtk_text_iter_set_line_offset (&start, 0);
gtk_text_iter_forward_line (&end);
text = gtk_text_iter_get_visible_text (&start, &end);
direction = pango_find_base_dir (text, -1);
return direction == GTK_TEXT_DIR_RTL;
g_free (text);
return direction == PANGO_DIRECTION_RTL;
}
static void
@ -6455,7 +6461,7 @@ gtk_text_view_move_cursor (GtkTextView *text_view,
gtk_text_buffer_get_iter_at_mark (get_buffer (text_view), &sel_bound,
gtk_text_buffer_get_selection_bound (get_buffer (text_view)));
if (iter_line_is_rtl (&insert, priv->layout))
if (iter_line_is_rtl (&insert))
move_forward = !move_forward;
/* if we move forward, assume the cursor is at the end of the selection;
@ -6493,7 +6499,7 @@ gtk_text_view_move_cursor (GtkTextView *text_view,
break;
case GTK_MOVEMENT_WORDS:
if (iter_line_is_rtl (&newplace, priv->layout))
if (iter_line_is_rtl (&newplace))
count *= -1;
if (count < 0)