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textview: give application developers access to RTL and LTR context

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This allows developers to modify the pango context that is used when
rendering text within the text view.

Such access can be useful to alter how rounding occurs with API such as
pango_context_set_round_glyph_positions() and is needed by GtkSourceView
for proper placement of glyphs within the overview map.
This commit is contained in:
Christian Hergert 2021-06-19 12:20:23 -07:00
parent 13a2db2238
commit a6101f0181
2 changed files with 50 additions and 0 deletions
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46
gtk/gtktextview.c
View File

@ -9963,3 +9963,49 @@ gtk_text_view_buffer_notify_undo (GtkTextBuffer *buffer,
(gtk_text_view_get_editable (view) &&
gtk_text_buffer_get_can_undo (buffer)));
}
/**
* gtk_text_view_get_ltr_context:
* @text_view: a `GtkTextView`
*
* Gets the `PangoContext` that is used for rendering LTR directed
* text layouts.
*
* The context may be replaced when CSS changes occur.
*
* Returns: (transfer none): a `PangoContext`
*
* Since: 4.4
*/
PangoContext *
gtk_text_view_get_ltr_context (GtkTextView *text_view)
{
g_return_val_if_fail (GTK_IS_TEXT_VIEW (text_view), NULL);
gtk_text_view_ensure_layout (text_view);
return text_view->priv->layout->ltr_context;
}
/**
* gtk_text_view_get_rtl_context:
* @text_view: a `GtkTextView`
*
* Gets the `PangoContext` that is used for rendering RTL directed
* text layouts.
*
* The context may be replaced when CSS changes occur.
*
* Returns: (transfer none): a `PangoContext`
*
* Since: 4.4
*/
PangoContext *
gtk_text_view_get_rtl_context (GtkTextView *text_view)
{
g_return_val_if_fail (GTK_IS_TEXT_VIEW (text_view), NULL);
gtk_text_view_ensure_layout (text_view);
return text_view->priv->layout->rtl_context;
}

4
gtk/gtktextview.h
View File

@ -427,6 +427,10 @@ void gtk_text_view_set_extra_menu (GtkTextView *text_vi
GMenuModel *model);
GDK_AVAILABLE_IN_ALL
GMenuModel * gtk_text_view_get_extra_menu (GtkTextView *text_view);
GDK_AVAILABLE_IN_ALL
PangoContext *gtk_text_view_get_rtl_context (GtkTextView *text_view);
GDK_AVAILABLE_IN_ALL
PangoContext *gtk_text_view_get_ltr_context (GtkTextView *text_view);
G_END_DECLS