[tepl] ApplicationWindow: update edit actions sensitivity

[Sébastien Wilmet <swilmet src gnome org>]

commit 88232c0c41f90227632b9b8dbf68c3543df0d76e
Author: Sébastien Wilmet <sebastien wilmet uclouvain be>
Date:   Sun Jul 23 16:30:59 2017 +0200

    ApplicationWindow: update edit actions sensitivity

 tepl/tepl-application-window.c |  127 ++++++++++++++++++++++++++++++++++++++++
 1 files changed, 127 insertions(+), 0 deletions(-)
---
diff --git a/tepl/tepl-application-window.c b/tepl/tepl-application-window.c
index 20da54c..8647e30 100644
--- a/tepl/tepl-application-window.c
+++ b/tepl/tepl-application-window.c
@@ -22,6 +22,7 @@
 #include "tepl-tab-group.h"
 #include "tepl-tab.h"
 #include "tepl-view.h"
+#include "tepl-signal-group.h"
 
 /**
  * SECTION:application-window
@@ -67,6 +68,8 @@ struct _TeplApplicationWindowPrivate
 {
        GtkApplicationWindow *gtk_window;
        TeplTabGroup *tab_group;
+       TeplSignalGroup *view_signal_group;
+       TeplSignalGroup *buffer_signal_group;
 };
 
 enum
@@ -185,6 +188,59 @@ select_all_cb (GSimpleAction *action,
 }
 
 static void
+update_edit_actions_sensitivity (TeplApplicationWindow *tepl_window)
+{
+       TeplView *view;
+       TeplBuffer *buffer;
+       gboolean view_is_editable = FALSE;
+       gboolean buffer_has_selection = FALSE;
+       GActionMap *action_map;
+       GAction *action;
+
+       view = tepl_tab_group_get_active_view (TEPL_TAB_GROUP (tepl_window));
+       buffer = tepl_tab_group_get_active_buffer (TEPL_TAB_GROUP (tepl_window));
+
+       if (view != NULL)
+       {
+               view_is_editable = gtk_text_view_get_editable (GTK_TEXT_VIEW (view));
+       }
+
+       if (buffer != NULL)
+       {
+               buffer_has_selection = gtk_text_buffer_get_has_selection (GTK_TEXT_BUFFER (buffer));
+       }
+
+       action_map = G_ACTION_MAP (tepl_window->priv->gtk_window);
+
+       action = g_action_map_lookup_action (action_map, "tepl-cut");
+       g_simple_action_set_enabled (G_SIMPLE_ACTION (action),
+                                    view_is_editable && buffer_has_selection);
+
+       action = g_action_map_lookup_action (action_map, "tepl-copy");
+       g_simple_action_set_enabled (G_SIMPLE_ACTION (action),
+                                    buffer_has_selection);
+
+       /* TODO see if the clipboard isn't empty. */
+       action = g_action_map_lookup_action (action_map, "tepl-paste");
+       g_simple_action_set_enabled (G_SIMPLE_ACTION (action),
+                                    buffer != NULL);
+
+       action = g_action_map_lookup_action (action_map, "tepl-delete");
+       g_simple_action_set_enabled (G_SIMPLE_ACTION (action),
+                                    view_is_editable && buffer_has_selection);
+
+       action = g_action_map_lookup_action (action_map, "tepl-select-all");
+       g_simple_action_set_enabled (G_SIMPLE_ACTION (action),
+                                    buffer != NULL);
+}
+
+static void
+update_actions_sensitivity (TeplApplicationWindow *tepl_window)
+{
+       update_edit_actions_sensitivity (tepl_window);
+}
+
+static void
 add_actions (TeplApplicationWindow *tepl_window)
 {
        /* The actions need to be namespaced, to not conflict with the
@@ -210,7 +266,10 @@ add_actions (TeplApplicationWindow *tepl_window)
                                                       entries,
                                                       G_N_ELEMENTS (entries),
                                                       tepl_window);
+
+       update_actions_sensitivity (tepl_window);
 }
+
 static void
 tepl_application_window_get_property (GObject    *object,
                                      guint       prop_id,
@@ -291,6 +350,12 @@ tepl_application_window_dispose (GObject *object)
        tepl_window->priv->gtk_window = NULL;
        g_clear_object (&tepl_window->priv->tab_group);
 
+       g_clear_pointer (&tepl_window->priv->view_signal_group,
+                        (GDestroyNotify) _tepl_signal_group_free);
+
+       g_clear_pointer (&tepl_window->priv->buffer_signal_group,
+                        (GDestroyNotify) _tepl_signal_group_free);
+
        G_OBJECT_CLASS (tepl_application_window_parent_class)->dispose (object);
 }
 
@@ -449,22 +514,84 @@ active_tab_notify_cb (TeplTabGroup          *tab_group,
                      GParamSpec            *pspec,
                      TeplApplicationWindow *tepl_window)
 {
+       update_edit_actions_sensitivity (tepl_window);
+
        g_object_notify (G_OBJECT (tepl_window), "active-tab");
 }
 
 static void
+active_view_editable_notify_cb (GtkTextView           *active_view,
+                               GParamSpec            *pspec,
+                               TeplApplicationWindow *tepl_window)
+{
+       update_edit_actions_sensitivity (tepl_window);
+}
+
+static void
 active_view_notify_cb (TeplTabGroup          *tab_group,
                       GParamSpec            *pspec,
                       TeplApplicationWindow *tepl_window)
 {
+       TeplView *active_view;
+
+       g_clear_pointer (&tepl_window->priv->view_signal_group,
+                        (GDestroyNotify) _tepl_signal_group_free);
+
+       active_view = tepl_tab_group_get_active_view (tab_group);
+
+       if (active_view == NULL)
+       {
+               goto exit;
+       }
+
+       tepl_window->priv->view_signal_group = _tepl_signal_group_new (G_OBJECT (active_view));
+
+       _tepl_signal_group_add_handler_id (tepl_window->priv->view_signal_group,
+                                          g_signal_connect (active_view,
+                                                            "notify::editable",
+                                                            G_CALLBACK (active_view_editable_notify_cb),
+                                                            tepl_window));
+
+exit:
        g_object_notify (G_OBJECT (tepl_window), "active-view");
 }
 
 static void
+active_buffer_has_selection_notify_cb (GtkTextBuffer         *buffer,
+                                      GParamSpec            *pspec,
+                                      TeplApplicationWindow *tepl_window)
+{
+       update_edit_actions_sensitivity (tepl_window);
+}
+
+static void
 active_buffer_notify_cb (TeplTabGroup          *tab_group,
                         GParamSpec            *pspec,
                         TeplApplicationWindow *tepl_window)
 {
+       TeplBuffer *active_buffer;
+
+       g_clear_pointer (&tepl_window->priv->buffer_signal_group,
+                        (GDestroyNotify) _tepl_signal_group_free);
+
+       active_buffer = tepl_tab_group_get_active_buffer (tab_group);
+
+       if (active_buffer == NULL)
+       {
+               goto exit;
+       }
+
+       tepl_window->priv->buffer_signal_group = _tepl_signal_group_new (G_OBJECT (active_buffer));
+
+       _tepl_signal_group_add_handler_id (tepl_window->priv->buffer_signal_group,
+                                          g_signal_connect (active_buffer,
+                                                            "notify::has-selection",
+                                                            G_CALLBACK 
(active_buffer_has_selection_notify_cb),
+                                                            tepl_window));
+
+exit:
+       update_edit_actions_sensitivity (tepl_window);
+
        g_object_notify (G_OBJECT (tepl_window), "active-buffer");
 }