[evolution] Fix image dropping in composer while in HTML mode.

[Matthew Barnes <mbarnes src gnome org>]

commit 93a51af22567bdddf3978716791f0be2e1dd2656
Author: Matthew Barnes <mbarnes redhat com>
Date:   Wed Feb 2 22:48:43 2011 -0500

    Fix image dropping in composer while in HTML mode.
    
    Dragging image data or an image URI to the message body while in HTML
    mode should insert the image inline, not attach it.  Without this the
    Picture Gallery feature is pointless.

 composer/e-composer-private.c |   75 ++++++++++++++++++++++++++++++++++++++++-
 composer/e-composer-private.h |    3 ++
 composer/e-msg-composer.c     |   15 ++++++++
 3 files changed, 92 insertions(+), 1 deletions(-)
---
diff --git a/composer/e-composer-private.c b/composer/e-composer-private.c
index 816ea10..cb926b9 100644
--- a/composer/e-composer-private.c
+++ b/composer/e-composer-private.c
@@ -414,7 +414,8 @@ e_composer_private_constructed (EMsgComposer *composer)
 
 	container = priv->gallery_scrolled_window;
 
-	gallery_path = e_shell_settings_get_string (shell_settings, "composer-gallery-path");
+	gallery_path = e_shell_settings_get_string (
+		shell_settings, "composer-gallery-path");
 	widget = e_picture_gallery_new (gallery_path);
 	gtk_container_add (GTK_CONTAINER (container), widget);
 	priv->gallery_icon_view = g_object_ref (widget);
@@ -813,3 +814,75 @@ e_composer_paste_uris (EMsgComposer *composer,
 
 	return TRUE;
 }
+
+gboolean
+e_composer_selection_is_image_uris (EMsgComposer *composer,
+                                    GtkSelectionData *selection)
+{
+	gboolean all_image_uris = TRUE;
+	gchar **uris;
+	guint ii;
+
+	g_return_val_if_fail (E_IS_MSG_COMPOSER (composer), FALSE);
+	g_return_val_if_fail (selection != NULL, FALSE);
+
+	uris = gtk_selection_data_get_uris (selection);
+
+	if (uris == NULL)
+		return FALSE;
+
+	for (ii = 0; uris[ii] != NULL; ii++) {
+		GFile *file;
+		GFileInfo *file_info;
+		GdkPixbufLoader *loader;
+		const gchar *attribute;
+		const gchar *content_type;
+		gchar *mime_type = NULL;
+
+		file = g_file_new_for_uri (uris[ii]);
+		attribute = G_FILE_ATTRIBUTE_STANDARD_FAST_CONTENT_TYPE;
+
+		/* XXX This blocks, but we're requesting the fast content
+		 *     type (which only inspects filenames), so hopefully
+		 *     it won't be noticeable.  Also, this is best effort
+		 *     so we don't really care if it fails. */
+		file_info = g_file_query_info (
+			file, attribute, G_FILE_QUERY_INFO_NONE, NULL, NULL);
+
+		if (file_info == NULL) {
+			g_object_unref (file);
+			all_image_uris = FALSE;
+			break;
+		}
+
+		content_type = g_file_info_get_attribute_string (
+			file_info, attribute);
+		mime_type = g_content_type_get_mime_type (content_type);
+
+		g_object_unref (file_info);
+		g_object_unref (file);
+
+		if (mime_type == NULL) {
+			all_image_uris = FALSE;
+			break;
+		}
+
+		/* Easy way to determine if a MIME type is a supported
+		 * image format: try creating a GdkPixbufLoader for it. */
+		loader = gdk_pixbuf_loader_new_with_mime_type (mime_type, NULL);
+
+		g_free (mime_type);
+
+		if (loader == NULL) {
+			all_image_uris = FALSE;
+			break;
+		}
+
+		gdk_pixbuf_loader_close (loader, NULL);
+		g_object_unref (loader);
+	}
+
+	g_strfreev (uris);
+
+	return all_image_uris;
+}
diff --git a/composer/e-composer-private.h b/composer/e-composer-private.h
index 20a3996..5cf503e 100644
--- a/composer/e-composer-private.h
+++ b/composer/e-composer-private.h
@@ -169,6 +169,9 @@ gboolean	e_composer_paste_text		(EMsgComposer *composer,
 						 GtkClipboard *clipboard);
 gboolean	e_composer_paste_uris		(EMsgComposer *composer,
 						 GtkClipboard *clipboard);
+gboolean	e_composer_selection_is_image_uris
+						(EMsgComposer *composer,
+						 GtkSelectionData *selection);
 
 G_END_DECLS
 
diff --git a/composer/e-msg-composer.c b/composer/e-msg-composer.c
index 7439007..d3df63a 100644
--- a/composer/e-msg-composer.c
+++ b/composer/e-msg-composer.c
@@ -1830,6 +1830,21 @@ msg_composer_drag_data_received_cb (GtkWidget *widget,
 {
 	EAttachmentView *view;
 
+	/* HTML mode has a few special cases for drops... */
+	if (gtkhtml_editor_get_html_mode (GTKHTML_EDITOR (composer))) {
+
+		/* If we're receiving an image, we want the image to be
+		 * inserted in the message body.  Let GtkHtml handle it. */
+		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;
+	}
+
 	view = e_msg_composer_get_attachment_view (composer);
 
 	/* Forward the data to the attachment view.  Note that calling