[gtk/emoji-keynav: 4/5] flowbox: Add a private api to disable move-cursor

[Matthias Clasen <matthiasc src gnome org>]

commit 8f75df1cb38fa2f59104a7280f3846873bd7fd4c
Author: Matthias Clasen <mclasen redhat com>
Date:   Tue Apr 14 15:03:57 2020 -0400

    flowbox: Add a private api to disable move-cursor
    
    Without this, it seems impossible to make cross-section
    keynav in the Emoji chooser work. I've tried, but got
    lost between the focus, grab_focus, move_cursor and
    keynav-failed vfuncs and signals, and their competing
    implementations GtkFlowBox and GtkEmojiChooser.

 gtk/gtkemojichooser.c   |  3 +++
 gtk/gtkflowbox.c        | 14 ++++++++++++++
 gtk/gtkflowboxprivate.h | 26 ++++++++++++++++++++++++++
 3 files changed, 43 insertions(+)
---
diff --git a/gtk/gtkemojichooser.c b/gtk/gtkemojichooser.c
index 57c92cb735..e17cabeca2 100644
--- a/gtk/gtkemojichooser.c
+++ b/gtk/gtkemojichooser.c
@@ -766,6 +766,8 @@ stop_search (GtkEntry *entry,
   gtk_popover_popdown (GTK_POPOVER (data));
 }
 
+extern void gtk_flow_box_disable_move_cursor (GtkFlowBox *box);
+
 static void
 setup_section (GtkEmojiChooser *chooser,
                EmojiSection   *section,
@@ -781,6 +783,7 @@ setup_section (GtkEmojiChooser *chooser,
   adj = gtk_scrolled_window_get_vadjustment (GTK_SCROLLED_WINDOW (chooser->scrolled_window));
 
   gtk_container_set_focus_vadjustment (GTK_CONTAINER (section->box), adj);
+  gtk_flow_box_disable_move_cursor (GTK_FLOW_BOX (section->box));
   gtk_flow_box_set_filter_func (GTK_FLOW_BOX (section->box), filter_func, section, NULL);
   g_signal_connect_swapped (section->button, "clicked", G_CALLBACK (scroll_to_section), section);
 }
diff --git a/gtk/gtkflowbox.c b/gtk/gtkflowbox.c
index da379f3a8a..84ba41df2f 100644
--- a/gtk/gtkflowbox.c
+++ b/gtk/gtkflowbox.c
@@ -76,6 +76,7 @@
 #include <config.h>
 
 #include "gtkflowbox.h"
+#include "gtkflowboxprivate.h"
 
 #include "gtkadjustment.h"
 #include "gtkcontainerprivate.h"
@@ -640,6 +641,8 @@ struct _GtkFlowBoxPrivate {
   GtkFlowBoxCreateWidgetFunc  create_widget_func;
   gpointer                    create_widget_func_data;
   GDestroyNotify              create_widget_func_data_destroy;
+
+  gboolean           disable_move_cursor;
 };
 
 #define BOX_PRIV(box) ((GtkFlowBoxPrivate*)gtk_flow_box_get_instance_private ((GtkFlowBox*)(box)))
@@ -3005,6 +3008,14 @@ gtk_flow_box_toggle_cursor_child (GtkFlowBox *box)
     gtk_flow_box_select_and_activate (box, priv->cursor_child);
 }
 
+void
+gtk_flow_box_disable_move_cursor (GtkFlowBox *box)
+{
+  GtkFlowBoxPrivate *priv = BOX_PRIV (box);
+  
+  priv->disable_move_cursor = TRUE;
+}
+
 static gboolean
 gtk_flow_box_move_cursor (GtkFlowBox      *box,
                           GtkMovementStep  step,
@@ -3023,6 +3034,9 @@ gtk_flow_box_move_cursor (GtkFlowBox      *box,
   GtkAdjustment *adjustment;
   gboolean vertical;
 
+  if (priv->disable_move_cursor)
+    return FALSE;
+
   vertical = priv->orientation == GTK_ORIENTATION_VERTICAL;
 
   if (vertical)
diff --git a/gtk/gtkflowboxprivate.h b/gtk/gtkflowboxprivate.h
new file mode 100644
index 0000000000..c609da36a3
--- /dev/null
+++ b/gtk/gtkflowboxprivate.h
@@ -0,0 +1,26 @@
+/* GTK - The GIMP Toolkit
+ *
+ * Copyright (C) 2020 Red Hat, Inc
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef __GTK_FLOW_BOX_PRIVATE_H__
+#define __GTK_FLOW_BOX_PRIVATE_H__
+
+#include "gtkflowbox.h"
+
+void gtk_flow_box_disable_move_cursor (GtkFlowBox *box);
+
+#endif