[gtk] popover: Add keynav keybindings

[Matthias Clasen <matthiasc src gnome org>]

commit 6eb848f0e00ff7bf1cbf4f21bed082f837d7aeb4
Author: Matthias Clasen <mclasen redhat com>
Date:   Tue Mar 17 17:24:09 2020 -0400

    popover: Add keynav keybindings
    
    The shortcut controllers are limited to same-native,
    so we need to duplicate the Tab and arrow key bindings
    for focus handling, as well as the Enter bindings for
    activation.

 gtk/gtkpopover.c | 54 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 54 insertions(+)
---
diff --git a/gtk/gtkpopover.c b/gtk/gtkpopover.c
index d1dfd74f34..ef7253d123 100644
--- a/gtk/gtkpopover.c
+++ b/gtk/gtkpopover.c
@@ -1444,12 +1444,47 @@ gtk_popover_remove (GtkContainer *container,
   gtk_widget_unparent (child);
 }
 
+static void
+add_tab_bindings (GtkBindingSet    *binding_set,
+                  GdkModifierType   modifiers,
+                  GtkDirectionType  direction)
+{
+  gtk_binding_entry_add_signal (binding_set, GDK_KEY_Tab, modifiers,
+                                "move-focus", 1,
+                                GTK_TYPE_DIRECTION_TYPE, direction);
+  gtk_binding_entry_add_signal (binding_set, GDK_KEY_KP_Tab, modifiers,
+                                "move-focus", 1,
+                                GTK_TYPE_DIRECTION_TYPE, direction);
+}
+
+static void
+add_arrow_bindings (GtkBindingSet    *binding_set,
+                    guint             keysym,
+                    GtkDirectionType  direction)
+{
+  guint keypad_keysym = keysym - GDK_KEY_Left + GDK_KEY_KP_Left;
+
+  gtk_binding_entry_add_signal (binding_set, keysym, 0,
+                                "move-focus", 1,
+                                GTK_TYPE_DIRECTION_TYPE, direction);
+  gtk_binding_entry_add_signal (binding_set, keysym, GDK_CONTROL_MASK,
+                                "move-focus", 1,
+                                GTK_TYPE_DIRECTION_TYPE, direction);
+  gtk_binding_entry_add_signal (binding_set, keypad_keysym, 0,
+                                "move-focus", 1,
+                                GTK_TYPE_DIRECTION_TYPE, direction);
+  gtk_binding_entry_add_signal (binding_set, keypad_keysym, GDK_CONTROL_MASK,
+                                "move-focus", 1,
+                                GTK_TYPE_DIRECTION_TYPE, direction);
+}
+
 static void
 gtk_popover_class_init (GtkPopoverClass *klass)
 {
   GObjectClass *object_class = G_OBJECT_CLASS (klass);
   GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (klass);
   GtkContainerClass *container_class = GTK_CONTAINER_CLASS (klass);
+  GtkBindingSet *binding_set;
 
   object_class->dispose = gtk_popover_dispose;
   object_class->finalize = gtk_popover_finalize;
@@ -1528,6 +1563,25 @@ gtk_popover_class_init (GtkPopoverClass *klass)
                   G_TYPE_NONE,
                   0);
 
+  binding_set = gtk_binding_set_by_class (klass);
+
+  add_arrow_bindings (binding_set, GDK_KEY_Up, GTK_DIR_UP);
+  add_arrow_bindings (binding_set, GDK_KEY_Down, GTK_DIR_DOWN);
+  add_arrow_bindings (binding_set, GDK_KEY_Left, GTK_DIR_LEFT);
+  add_arrow_bindings (binding_set, GDK_KEY_Right, GTK_DIR_RIGHT);
+
+  add_tab_bindings (binding_set, 0, GTK_DIR_TAB_FORWARD);
+  add_tab_bindings (binding_set, GDK_CONTROL_MASK, GTK_DIR_TAB_FORWARD);
+  add_tab_bindings (binding_set, GDK_SHIFT_MASK, GTK_DIR_TAB_BACKWARD);
+  add_tab_bindings (binding_set, GDK_CONTROL_MASK | GDK_SHIFT_MASK, GTK_DIR_TAB_BACKWARD);
+
+  gtk_binding_entry_add_signal (binding_set, GDK_KEY_Return, 0,
+                                "activate-default", 0);
+  gtk_binding_entry_add_signal (binding_set, GDK_KEY_ISO_Enter, 0,
+                                "activate-default", 0);
+  gtk_binding_entry_add_signal (binding_set, GDK_KEY_KP_Enter, 0,
+                                "activate-default", 0);
+
   gtk_widget_class_set_css_name (widget_class, "popover");
 }