[evolution/wip/webkit-composer: 265/372] Bug #689795 - [webkit-composer] Drag&drop of an image doesn't add it

[Tomas Popela <tpopela src gnome org>]

commit 854e3eb7f1ec315a0cf2378042e370b595232d70
Author: Tomas Popela <tpopela redhat com>
Date:   Fri Jun 21 12:10:43 2013 +0200

    Bug #689795 - [webkit-composer] Drag&drop of an image doesn't add it
    
    Based on GtkHtml implementation.

 composer/e-msg-composer.c |  116 ++++++++++++++++++++++++++++-----------------
 1 files changed, 73 insertions(+), 43 deletions(-)
---
diff --git a/composer/e-msg-composer.c b/composer/e-msg-composer.c
index 8fce777..ead99e7 100644
--- a/composer/e-msg-composer.c
+++ b/composer/e-msg-composer.c
@@ -100,6 +100,24 @@ enum {
        LAST_SIGNAL
 };
 
+enum DndTargetType {
+       DND_TARGET_TYPE_TEXT_URI_LIST,
+       DND_TARGET_TYPE_MOZILLA_URL,
+       DND_TARGET_TYPE_TEXT_HTML,
+       DND_TARGET_TYPE_UTF8_STRING,
+       DND_TARGET_TYPE_TEXT_PLAIN,
+       DND_TARGET_TYPE_STRING
+};
+
+static GtkTargetEntry drag_dest_targets[] = {
+       { (gchar *) "text/uri-list", 0, DND_TARGET_TYPE_TEXT_URI_LIST },
+       { (gchar *) "_NETSCAPE_URL", 0, DND_TARGET_TYPE_MOZILLA_URL },
+       { (gchar *) "text/html", 0, DND_TARGET_TYPE_TEXT_HTML },
+       { (gchar *) "UTF8_STRING", 0, DND_TARGET_TYPE_UTF8_STRING },
+       { (gchar *) "text/plain", 0, DND_TARGET_TYPE_TEXT_PLAIN },
+       { (gchar *) "STRING", 0, DND_TARGET_TYPE_STRING },
+};
+
 static guint signals[LAST_SIGNAL];
 
 /* used by e_msg_composer_add_message_attachments () */
@@ -1697,39 +1715,6 @@ msg_composer_paste_clipboard_cb (EEditorWidget *web_view,
        g_signal_stop_emission_by_name (web_view, "paste-clipboard");
 }
 
-/* FIXME WEBKIT Is this still valid problem? */
-static void
-msg_composer_realize_gtkhtml_cb (GtkWidget *widget,
-                                 EMsgComposer *composer)
-{
-       EAttachmentView *view;
-       GtkTargetList *target_list;
-       GtkTargetEntry *targets;
-       gint n_targets;
-
-       /* XXX GtkHTML doesn't set itself up as a drag destination until
-        *     it's realized, and we need to amend to its target list so
-        *     it will accept the same drag targets as the attachment bar.
-        *     Do this any earlier and GtkHTML will just overwrite us. */
-
-       /* When redirecting a message, the message body is not
-        * editable and therefore cannot be a drag destination. */
-       /*
-       if (!e_web_view_gtkhtml_get_editable (E_WEB_VIEW_GTKHTML (widget)))
-               return;
-       */
-
-       view = e_msg_composer_get_attachment_view (composer);
-
-       target_list = e_attachment_view_get_target_list (view);
-       targets = gtk_target_table_new_from_list (target_list, &n_targets);
-
-       target_list = gtk_drag_dest_get_target_list (widget);
-       gtk_target_list_add_table (target_list, targets, n_targets);
-
-       gtk_target_table_free (targets, n_targets);
-}
-
 static gboolean
 msg_composer_drag_motion_cb (GtkWidget *widget,
                              GdkDragContext *context,
@@ -1748,6 +1733,31 @@ msg_composer_drag_motion_cb (GtkWidget *widget,
        return e_attachment_view_drag_motion (view, context, x, y, time);
 }
 
+static gchar *
+next_uri (guchar **uri_list,
+          gint *len,
+          gint *list_len)
+{
+       guchar *uri, *begin;
+
+       begin = *uri_list;
+       *len = 0;
+       while (**uri_list && **uri_list != '\n' && **uri_list != '\r' && *list_len) {
+               (*uri_list) ++;
+               (*len) ++;
+               (*list_len) --;
+       }
+
+       uri = (guchar *) g_strndup ((gchar *) begin, *len);
+
+       while ((!**uri_list || **uri_list == '\n' || **uri_list == '\r') && *list_len) {
+               (*uri_list) ++;
+               (*list_len) --;
+       }
+
+       return (gchar *) uri;
+}
+
 static void
 msg_composer_drag_data_received_cb (GtkWidget *widget,
                                     GdkDragContext *context,
@@ -1767,17 +1777,35 @@ msg_composer_drag_data_received_cb (GtkWidget *widget,
 
        /* HTML mode has a few special cases for drops... */
        if (e_editor_widget_get_html_mode (editor_widget)) {
-
                /* If we're receiving an image, we want the image to be
                 * inserted in the message body.  Let GtkHtml handle it. */
+               /* FIXME WebKit - how to reproduce this?
                if (gtk_selection_data_targets_include_image (selection, TRUE))
                        return;
-
+                */
                /* If we're receiving URIs and -all- the URIs point to
                 * image files, we want the image(s) to be inserted in
-                * the message body.  Let GtkHtml handle it. */
-               if (e_composer_selection_is_image_uris (composer, selection))
-                       return;
+                * the message body. */
+               if (e_composer_selection_is_image_uris (composer, selection)) {
+                       const guchar *data;
+                       gint length;
+                       gint list_len, len;
+                       gchar *uri;
+
+                       data = gtk_selection_data_get_data (selection);
+                       length = gtk_selection_data_get_length (selection);
+
+                       if (!data || length < 0)
+                               return;
+
+                       list_len = length;
+                       do {
+                               uri = next_uri ((guchar **) &data, &len, &list_len);
+                               e_editor_widget_exec_command (editor_widget, 
E_EDITOR_WIDGET_COMMAND_INSERT_IMAGE, uri);
+                       } while (list_len);
+               }
+
+               /* FIXME CID images */
        }
 
        view = e_msg_composer_get_attachment_view (composer);
@@ -1790,7 +1818,7 @@ msg_composer_drag_data_received_cb (GtkWidget *widget,
                E_ATTACHMENT_PANED (view),
                context, x, y, selection, info, time);
 
-       /* Stop the signal from propagating to GtkHtml. */
+       /* Stop the signal from propagating */
        g_signal_stop_emission_by_name (widget, "drag-data-received");
 }
 
@@ -2033,10 +2061,6 @@ msg_composer_constructed (GObject *object)
        /* Drag-and-Drop Support */
 
        g_signal_connect (
-               editor_widget, "realize",
-               G_CALLBACK (msg_composer_realize_gtkhtml_cb), composer);
-
-       g_signal_connect (
                editor_widget, "drag-motion",
                G_CALLBACK (msg_composer_drag_motion_cb), composer);
 
@@ -2092,6 +2116,12 @@ msg_composer_constructed (GObject *object)
        /* Initialization may have tripped the "changed" state. */
        e_editor_widget_set_changed (editor_widget, FALSE);
 
+       gtk_drag_dest_set (
+               GTK_WIDGET (editor_widget),
+               GTK_DEST_DEFAULT_HIGHLIGHT | GTK_DEST_DEFAULT_DROP,
+               drag_dest_targets, G_N_ELEMENTS (drag_dest_targets),
+               GDK_ACTION_COPY | GDK_ACTION_MOVE | GDK_ACTION_LINK);
+
        id = "org.gnome.evolution.composer";
        e_plugin_ui_register_manager (ui_manager, id, composer);
        e_plugin_ui_enable_manager (ui_manager, id);