fix embedded plugin UI keyboard handling

When the GUI is opened the first time all is fine, focus is on the
embedded widget. However once a user presses one of the preset buttons
(Add, Save,...) there is no possibility to return focus to the
embedded widget. Ardour always 'sees' it as focus=GtkButton and passes
the event to the editor.

1 files changed, 11 insertions, 0 deletions

diff --git a/gtk2_ardour/lv2_plugin_ui.cc b/gtk2_ardour/lv2_plugin_ui.cc
index 3a64a830d1..8e57eeed60 100644
--- a/gtk2_ardour/lv2_plugin_ui.cc
+++ b/gtk2_ardour/lv2_plugin_ui.cc
@@ -341,6 +341,8 @@ LV2PluginUI::lv2ui_instantiate(const std::string& title)
 				container->add(*Gtk::manage(Glib::wrap(c_widget)));
 			}
 			container->show_all();
+			gtk_widget_set_can_focus(c_widget, true);
+			gtk_widget_grab_focus(c_widget);
 		} else {
 			_external_ui_ptr = (struct lv2_external_ui*)GET_WIDGET(_inst);
 		}
@@ -369,6 +371,15 @@ LV2PluginUI::lv2ui_instantiate(const std::string& title)
 }
 
 void
+LV2PluginUI::grab_focus()
+{
+	if (_inst && !_lv2->is_external_ui()) {
+		GtkWidget* c_widget = (GtkWidget*)GET_WIDGET(_inst);
+		gtk_widget_grab_focus(c_widget);
+	}
+}
+
+void
 LV2PluginUI::lv2ui_free()
 {
 	stop_updating (0);