[gnome-todo] arrow-frame: limit max drag

[Georges Basile Stavracas Neto <gbsneto src gnome org>]

commit 8f2f3ef4bf0d57cdacc9a68892c1b20d06d96896
Author: Georges Basile Stavracas Neto <georges stavracas gmail com>
Date:   Mon Aug 10 18:48:43 2015 -0300

    arrow-frame: limit max drag
    
    We don't want to drag the arrow out of the
    window boundaries.

 src/gtd-arrow-frame.c |    8 +++++++-
 1 files changed, 7 insertions(+), 1 deletions(-)
---
diff --git a/src/gtd-arrow-frame.c b/src/gtd-arrow-frame.c
index 39fe843..25ffa0d 100644
--- a/src/gtd-arrow-frame.c
+++ b/src/gtd-arrow-frame.c
@@ -17,6 +17,7 @@
  */
 
 #include "gtd-arrow-frame.h"
+#include "gtd-task-list-view.h"
 #include "gtd-task-row.h"
 
 typedef struct
@@ -85,13 +86,18 @@ on_pan_cb (GtkWidget       *widget,
 {
   GtdArrowFramePrivate *priv;
   GtkTextDirection dir;
+  GtkWidget *ancestor;
   gdouble offset_x;
+  gint max_width;
 
   priv = GTD_ARROW_FRAME (widget)->priv;
   dir = gtk_widget_get_direction (widget);
+  ancestor = gtk_widget_get_ancestor (widget, GTD_TYPE_TASK_LIST_VIEW);
 
   priv->moving = TRUE;
 
+  max_width = gtk_widget_get_allocated_width (ancestor);
+
   gtk_gesture_drag_get_offset (GTK_GESTURE_DRAG (pan),
                                &offset_x,
                                NULL);
@@ -99,7 +105,7 @@ on_pan_cb (GtkWidget       *widget,
   if (dir == GTK_TEXT_DIR_RTL)
     priv->offset = MAX (0, offset_x);
   else
-    priv->offset = MAX (0, priv->offset + -1 * offset_x);
+    priv->offset = MAX (0, priv->offset - offset_x);
 
 
   gtk_widget_queue_resize (widget);