improve the behaviour of Mixer_UI::move_stripable_into_view()

[ardour.git] / gtk2_ardour / mouse_cursors.h

diff --git a/gtk2_ardour/mouse_cursors.h b/gtk2_ardour/mouse_cursors.h
index 6c5c94b5e917330ed80cb450f7f2efe0c96242b8..ed29840b68044cbedf7e402cf178e1fc60e825ad 100644 (file)
--- a/gtk2_ardour/mouse_cursors.h
+++ b/gtk2_ardour/mouse_cursors.h
@@ -29,6 +29,7 @@ class MouseCursors
 {
 public:
        MouseCursors ();
+       ~MouseCursors ();
 
        void set_cursor_set (const std::string& name);
        std::string cursor_set() const { return _cursor_set; }
@@ -73,11 +74,23 @@ public:
        Gdk::Cursor* expand_left_right;
        Gdk::Cursor* expand_up_down;
 
+       /* This cursor is not intended to be used directly, it just
+          serves as an out-of-bounds value when we need to indicate
+          "no cursor". NULL/0 doesn't work for this, because it
+          is actually a valid value for a Gdk::Cursor - it indicates
+          "use the parent window's cursor"
+       */
+
+       static bool is_invalid (Gdk::Cursor* c) { if (!_invalid) { create_invalid(); } return c == _invalid; }
+       static Gdk::Cursor* invalid_cursor() { if (!_invalid) { create_invalid(); } return _invalid; }
+
     private:
        std::string _cursor_set;
        void drop_all ();
 
        Gdk::Cursor* make_cursor (const char* name, int hotspot_x = 0, int hotspot_y = 0);
+       static Gdk::Cursor* _invalid;
+       static void create_invalid ();
 };
 
 #endif /* __gtk2_ardour_mouse_cursors__ */