[gedit] ReplaceDialog: better update replace button sensitivity

[Sébastien Wilmet <swilmet src gnome org>]

commit b600de0ca0c8f474cebe4cd78dce342718b2be07
Author: Sébastien Wilmet <swilmet gnome org>
Date:   Tue Aug 27 18:08:20 2013 +0200

    ReplaceDialog: better update replace button sensitivity
    
    Now the replace button is sensitive only when a match is selected.

 gedit/gedit-commands-search.c |    8 ---
 gedit/gedit-replace-dialog.c  |  136 ++++++++++++++++++++++++++++++++++++-----
 2 files changed, 121 insertions(+), 23 deletions(-)
---
diff --git a/gedit/gedit-commands-search.c b/gedit/gedit-commands-search.c
index 429577b..d92009c 100644
--- a/gedit/gedit-commands-search.c
+++ b/gedit/gedit-commands-search.c
@@ -168,10 +168,6 @@ finish_search_from_dialog (GeditWindow *window,
        {
                text_not_found (window, replace_dialog);
        }
-
-       gtk_dialog_set_response_sensitive (GTK_DIALOG (replace_dialog),
-                                          GEDIT_REPLACE_DIALOG_REPLACE_RESPONSE,
-                                          found);
 }
 
 static gboolean
@@ -484,10 +480,6 @@ do_replace_all (GeditReplaceDialog *dialog,
        {
                text_not_found (window, dialog);
        }
-
-       gtk_dialog_set_response_sensitive (GTK_DIALOG (dialog),
-                                          GEDIT_REPLACE_DIALOG_REPLACE_RESPONSE,
-                                          FALSE);
 }
 
 static void
diff --git a/gedit/gedit-replace-dialog.c b/gedit/gedit-replace-dialog.c
index 751b209..2e305cb 100644
--- a/gedit/gedit-replace-dialog.c
+++ b/gedit/gedit-replace-dialog.c
@@ -51,6 +51,8 @@ struct _GeditReplaceDialogPrivate
        GtkSourceSearchSettings *search_settings;
 
        GeditDocument *active_document;
+
+       guint idle_update_sensitivity_id;
 };
 
 G_DEFINE_TYPE_WITH_PRIVATE (GeditReplaceDialog, gedit_replace_dialog, GTK_TYPE_DIALOG)
@@ -199,6 +201,74 @@ update_regex_error (GeditReplaceDialog *dialog)
        g_error_free (regex_error);
 }
 
+static gboolean
+update_replace_response_sensitivity_cb (GeditReplaceDialog *dialog)
+{
+       GtkSourceSearchContext *search_context;
+       GtkTextIter start;
+       GtkTextIter end;
+       gint pos;
+
+       search_context = get_search_context (dialog, dialog->priv->active_document);
+
+       if (search_context == NULL)
+       {
+               dialog->priv->idle_update_sensitivity_id = 0;
+               return G_SOURCE_REMOVE;
+       }
+
+       gtk_text_buffer_get_selection_bounds (GTK_TEXT_BUFFER (dialog->priv->active_document),
+                                             &start,
+                                             &end);
+
+       pos = gtk_source_search_context_get_occurrence_position (search_context,
+                                                                &start,
+                                                                &end);
+
+       if (pos < 0)
+       {
+               return G_SOURCE_CONTINUE;
+       }
+
+       gtk_dialog_set_response_sensitive (GTK_DIALOG (dialog),
+                                          GEDIT_REPLACE_DIALOG_REPLACE_RESPONSE,
+                                          pos > 0);
+
+       dialog->priv->idle_update_sensitivity_id = 0;
+       return G_SOURCE_REMOVE;
+}
+
+static void
+install_idle_update_sensitivity (GeditReplaceDialog *dialog)
+{
+       if (dialog->priv->idle_update_sensitivity_id != 0)
+       {
+               return;
+       }
+
+       dialog->priv->idle_update_sensitivity_id =
+               g_idle_add ((GSourceFunc)update_replace_response_sensitivity_cb,
+                           dialog);
+}
+
+static void
+mark_set_cb (GtkTextBuffer      *buffer,
+            GtkTextIter        *location,
+            GtkTextMark        *mark,
+            GeditReplaceDialog *dialog)
+{
+       GtkTextMark *insert;
+       GtkTextMark *selection_bound;
+
+       insert = gtk_text_buffer_get_insert (buffer);
+       selection_bound = gtk_text_buffer_get_selection_bound (buffer);
+
+       if (mark == insert || mark == selection_bound)
+       {
+               install_idle_update_sensitivity (dialog);
+       }
+}
+
 static void
 update_responses_sensitivity (GeditReplaceDialog *dialog)
 {
@@ -206,6 +276,8 @@ update_responses_sensitivity (GeditReplaceDialog *dialog)
        GtkSourceSearchContext *search_context;
        gboolean sensitive = TRUE;
 
+       install_idle_update_sensitivity (dialog);
+
        search_text = gtk_entry_get_text (GTK_ENTRY (dialog->priv->search_text_entry));
 
        if (search_text[0] == '\0')
@@ -250,27 +322,41 @@ regex_error_notify_cb (GeditReplaceDialog *dialog)
 }
 
 static void
-connect_active_document (GeditReplaceDialog *dialog)
+disconnect_document (GeditReplaceDialog *dialog)
 {
-       GeditDocument *doc;
        GtkSourceSearchContext *search_context;
 
-       doc = get_active_document (dialog);
-
-       if (dialog->priv->active_document != NULL)
+       if (dialog->priv->active_document == NULL)
        {
-               search_context = get_search_context (dialog, dialog->priv->active_document);
+               return;
+       }
 
-               if (search_context != NULL)
-               {
-                       g_signal_handlers_disconnect_by_func (search_context,
-                                                             regex_error_notify_cb,
-                                                             dialog);
-               }
+       search_context = get_search_context (dialog, dialog->priv->active_document);
 
-               g_clear_object (&dialog->priv->active_document);
+       if (search_context != NULL)
+       {
+               g_signal_handlers_disconnect_by_func (search_context,
+                                                     regex_error_notify_cb,
+                                                     dialog);
        }
 
+       g_signal_handlers_disconnect_by_func (dialog->priv->active_document,
+                                             mark_set_cb,
+                                             dialog);
+
+       g_clear_object (&dialog->priv->active_document);
+}
+
+static void
+connect_active_document (GeditReplaceDialog *dialog)
+{
+       GeditDocument *doc;
+       GtkSourceSearchContext *search_context;
+
+       disconnect_document (dialog);
+
+       doc = get_active_document (dialog);
+
        if (doc == NULL)
        {
                return;
@@ -295,6 +381,12 @@ connect_active_document (GeditReplaceDialog *dialog)
                                 dialog,
                                 G_CONNECT_SWAPPED);
 
+       g_signal_connect_object (doc,
+                                "mark-set",
+                                G_CALLBACK (mark_set_cb),
+                                dialog,
+                                0);
+
        update_regex_error (dialog);
        update_responses_sensitivity (dialog);
 }
@@ -306,8 +398,6 @@ gedit_replace_dialog_response (GtkDialog *dialog,
        GeditReplaceDialog *dlg = GEDIT_REPLACE_DIALOG (dialog);
        const gchar *str;
 
-       connect_active_document (GEDIT_REPLACE_DIALOG (dialog));
-
        switch (response_id)
        {
                case GEDIT_REPLACE_DIALOG_REPLACE_RESPONSE:
@@ -329,6 +419,14 @@ gedit_replace_dialog_response (GtkDialog *dialog,
                                                 str);
                        }
        }
+
+       switch (response_id)
+       {
+               case GEDIT_REPLACE_DIALOG_REPLACE_RESPONSE:
+               case GEDIT_REPLACE_DIALOG_REPLACE_ALL_RESPONSE:
+               case GEDIT_REPLACE_DIALOG_FIND_RESPONSE:
+                       connect_active_document (GEDIT_REPLACE_DIALOG (dialog));
+       }
 }
 
 static void
@@ -339,6 +437,12 @@ gedit_replace_dialog_dispose (GObject *object)
        g_clear_object (&dialog->priv->search_settings);
        g_clear_object (&dialog->priv->active_document);
 
+       if (dialog->priv->idle_update_sensitivity_id != 0)
+       {
+               g_source_remove (dialog->priv->idle_update_sensitivity_id);
+               dialog->priv->idle_update_sensitivity_id = 0;
+       }
+
        G_OBJECT_CLASS (gedit_replace_dialog_parent_class)->dispose (object);
 }
 
@@ -470,6 +574,8 @@ hide_cb (GeditReplaceDialog *dialog)
        GeditWindow *window = get_gedit_window (dialog);
 
        g_signal_handlers_disconnect_by_func (window, connect_active_document, dialog);
+
+       disconnect_document (dialog);
 }
 
 static void