[evolution/wip/webkit-composer: 694/966] Bug #689803 - [webkit-composer] "Start typing at the bottom on replying" ignored

[Tomas Popela <tpopela src gnome org>]

commit bb3448ab8caed892ba6f346039b7be87682be268
Author: Tomas Popela <tpopela redhat com>
Date:   Wed Apr 17 14:44:39 2013 +0200

    Bug #689803 - [webkit-composer] "Start typing at the bottom on replying" ignored

 mail/em-composer-utils.c |   88 ++++++++++++++++++++++++++++++++++++++++++++++
 1 files changed, 88 insertions(+), 0 deletions(-)
---
diff --git a/mail/em-composer-utils.c b/mail/em-composer-utils.c
index 63067cf..f2677c7 100644
--- a/mail/em-composer-utils.c
+++ b/mail/em-composer-utils.c
@@ -2813,6 +2813,88 @@ attribution_format (CamelMimeMessage *message)
 }
 
 static void
+composer_size_allocate_cb (GtkWidget *widget,
+                          gpointer user_data)
+{
+       GtkWidget *scrolled_window;
+       GtkAdjustment *adj;
+
+       scrolled_window = gtk_widget_get_parent (GTK_WIDGET (widget));
+       adj = gtk_scrolled_window_get_vadjustment (GTK_SCROLLED_WINDOW (scrolled_window));
+
+       /* Scroll only when there is some size allocated */
+       if (gtk_adjustment_get_upper (adj) != 0.0) {
+               /* Scroll web view down to caret */
+               gtk_adjustment_set_value (adj, gtk_adjustment_get_upper (adj) - gtk_adjustment_get_page_size 
(adj));
+               gtk_scrolled_window_set_vadjustment (GTK_SCROLLED_WINDOW (scrolled_window), adj);
+               /* Disconnect because we don't want to scroll down the view on every window size change */
+               g_signal_handlers_disconnect_by_func (
+                       widget, G_CALLBACK (composer_size_allocate_cb), NULL);
+       }
+}
+
+static void
+web_view_load_status_changed_cb (WebKitWebView *webkit_web_view,
+                                 GParamSpec *pspec,
+                                 gpointer user_data)
+{
+       WebKitDOMDocument *document;
+       WebKitDOMRange *new_range;
+       WebKitDOMElement *br;
+       WebKitDOMHTMLElement *body;
+       WebKitDOMNode *br_node;
+       WebKitDOMDOMWindow *window;
+       WebKitDOMDOMSelection *window_selection;
+       WebKitLoadStatus status;
+
+       status = webkit_web_view_get_load_status (webkit_web_view);
+       if (status != WEBKIT_LOAD_FINISHED)
+               return;
+
+       /* Move caret on the end of body element */
+       document = webkit_web_view_get_dom_document (webkit_web_view);
+       window = webkit_dom_document_get_default_view (document);
+       window_selection = webkit_dom_dom_window_get_selection (window);
+       body = webkit_dom_document_get_body (document);
+
+       br = webkit_dom_document_create_element (document, "BR", NULL);
+       br_node = webkit_dom_node_append_child (WEBKIT_DOM_NODE (body), WEBKIT_DOM_NODE(br), NULL);
+
+       new_range = webkit_dom_document_create_range (document);
+       webkit_dom_range_select_node_contents (new_range, WEBKIT_DOM_NODE (br_node), NULL);
+       webkit_dom_range_collapse (new_range, FALSE, NULL);
+
+       webkit_dom_dom_selection_remove_all_ranges (window_selection);
+       webkit_dom_dom_selection_add_range (window_selection, new_range);
+
+       /* Disconnect because we don't want to move caret down on every web view status change */
+       g_signal_handlers_disconnect_by_func (
+               webkit_web_view, G_CALLBACK (web_view_load_status_changed_cb), NULL);
+}
+
+static void
+composer_set_caret_on_body_end (EMsgComposer *composer)
+{
+       EEditor *editor;
+       EEditorWidget *widget;
+
+       editor = e_msg_composer_get_editor (composer);
+       widget = e_editor_get_editor_widget (editor);
+
+       /* Scroll web view down to caret - we have to wait until
+        * GtkScrolledWindow is resized */
+       g_signal_connect (
+               widget, "size-allocate",
+               G_CALLBACK (composer_size_allocate_cb), NULL);
+
+       /* Set caret on the end of body - we have to wait until
+        * the page is loaded */
+       g_signal_connect (
+               WEBKIT_WEB_VIEW(widget), "notify::load-status",
+               G_CALLBACK (web_view_load_status_changed_cb), NULL);
+}
+
+static void
 composer_set_body (EMsgComposer *composer,
                    CamelMimeMessage *message,
                    EMailReplyStyle style,
@@ -2847,6 +2929,9 @@ composer_set_body (EMsgComposer *composer,
                g_free (text);
                g_free (original);
                emu_update_composers_security (composer, validity_found);
+
+               if (start_bottom)
+                       composer_set_caret_on_body_end (composer);
                break;
 
        case E_MAIL_REPLY_STYLE_QUOTED:
@@ -2861,6 +2946,9 @@ composer_set_body (EMsgComposer *composer,
                e_msg_composer_set_body_text (composer, text, TRUE);
                g_free (text);
                emu_update_composers_security (composer, validity_found);
+
+               if (start_bottom)
+                       composer_set_caret_on_body_end (composer);
                break;
        }