[gnome-builder/wip/gtk4-port] plugins/editorui: add insert/overwrite indicator

[Christian Hergert <chergert src gnome org>]

commit 8f5bbc41e988a1048e1696a408b8f4d1f60c6a8f
Author: Christian Hergert <chergert redhat com>
Date:   Sat Apr 9 10:07:46 2022 -0700

    plugins/editorui: add insert/overwrite indicator
    
    This will need some special casing with Vim still, but we can figure that
    out later on. The problem is that we abuse "overwrite" mode when using Vim
    emulation to look like a block cursor since GTK does not allow us to
    control the cursor style independently.

 .../editorui/gbp-editorui-workspace-addin.c        | 33 ++++++++++++++++++++++
 1 file changed, 33 insertions(+)
---
diff --git a/src/plugins/editorui/gbp-editorui-workspace-addin.c 
b/src/plugins/editorui/gbp-editorui-workspace-addin.c
index d305e0d91..9a312c926 100644
--- a/src/plugins/editorui/gbp-editorui-workspace-addin.c
+++ b/src/plugins/editorui/gbp-editorui-workspace-addin.c
@@ -54,6 +54,8 @@ struct _GbpEditoruiWorkspaceAddin
   GtkMenuButton            *encoding;
   GtkLabel                 *encoding_label;
 
+  GtkLabel                 *mode_label;
+
   guint                     queued_cursor_moved;
 };
 
@@ -70,6 +72,24 @@ static void
     }
 }
 
+static void
+notify_overwrite_cb (GbpEditoruiWorkspaceAddin *self)
+{
+  IdeSourceView *view;
+
+  g_assert (GBP_IS_EDITORUI_WORKSPACE_ADDIN (self));
+
+  if ((view = ide_signal_group_get_target (self->view_signals)))
+    {
+      gboolean overwrite = gtk_text_view_get_overwrite (GTK_TEXT_VIEW (view));
+
+      if (overwrite)
+        gtk_label_set_label (self->mode_label, "OVR");
+      else
+        gtk_label_set_label (self->mode_label, "INS");
+    }
+}
+
 static void
 notify_indentation_cb (GbpEditoruiWorkspaceAddin *self)
 {
@@ -306,6 +326,11 @@ gbp_editorui_workspace_addin_load (IdeWorkspaceAddin *addin,
                                    G_CALLBACK (notify_indentation_cb),
                                    self,
                                    G_CONNECT_SWAPPED);
+  ide_signal_group_connect_object (self->view_signals,
+                                   "notify::overwrite",
+                                   G_CALLBACK (notify_overwrite_cb),
+                                   self,
+                                   G_CONNECT_SWAPPED);
 
   /* Encoding */
   encoding_menu = ide_editor_encoding_menu_new ("editorui.encoding");
@@ -333,6 +358,12 @@ gbp_editorui_workspace_addin_load (IdeWorkspaceAddin *addin,
                                   NULL);
   panel_statusbar_add_suffix (self->statusbar, GTK_WIDGET (self->line_ends));
 
+  self->mode_label = g_object_new (GTK_TYPE_LABEL,
+                                   "label", "INS",
+                                   "width-chars", 4,
+                                   NULL);
+  panel_statusbar_add_suffix (self->statusbar, GTK_WIDGET (self->mode_label));
+
   /* Indentation status, tabs/spaces/etc */
   menu = ide_application_get_menu_by_id (IDE_APPLICATION_DEFAULT, "editorui-indent-menu");
   self->indentation_label = g_object_new (GTK_TYPE_LABEL, NULL);
@@ -414,6 +445,7 @@ gbp_editorui_workspace_addin_page_changed (IdeWorkspaceAddin *addin,
   ide_signal_group_set_target (self->buffer_signals, buffer);
   ide_signal_group_set_target (self->view_signals, view);
 
+  notify_overwrite_cb (self);
   notify_indentation_cb (self);
   update_position (self);
 
@@ -421,6 +453,7 @@ gbp_editorui_workspace_addin_page_changed (IdeWorkspaceAddin *addin,
   gtk_widget_set_visible (GTK_WIDGET (self->line_ends), page != NULL);
   gtk_widget_set_visible (GTK_WIDGET (self->position), page != NULL);
   gtk_widget_set_visible (GTK_WIDGET (self->encoding), page != NULL);
+  gtk_widget_set_visible (GTK_WIDGET (self->mode_label), page != NULL);
 }
 
 static void