change Metric element of a Canvas::Ruler item into a pointer internally

[ardour.git] / libs / canvas / canvas / canvas.h

diff --git a/libs/canvas/canvas/canvas.h b/libs/canvas/canvas/canvas.h
index 187a773104f3b64bb8e201f92dc433424bb99006..c3ab322b67cf12079c277743c424650151d69f8d 100644 (file)
--- a/libs/canvas/canvas/canvas.h
+++ b/libs/canvas/canvas/canvas.h
@@ -40,9 +40,9 @@
 
 namespace ArdourCanvas
 {
+struct Rect;
 
-class Rect;
-class Group;   
+class Item;
 class ScrollGroup;
 
 /** The base class for our different types of canvas.
@@ -78,7 +78,7 @@ public:
        void render (Rect const &, Cairo::RefPtr<Cairo::Context> const &) const;
 
        /** @return root group */
-       Group* root () {
+       Item* root () {
                return &_root;
        }
 
@@ -107,24 +107,45 @@ public:
         }
 
         void scroll_to (Coord x, Coord y);
-       Duple scroll_offset() const { return _scroll_offset; }
        void add_scroller (ScrollGroup& i);
         
-        virtual Rect visible_area () const = 0;
+        virtual Rect  visible_area () const = 0;
+        virtual Coord width () const = 0;
+        virtual Coord height () const = 0;
+
+       /** Store the coordinates of the mouse pointer in window coordinates in
+          @param winpos. Return true if the position was within the window,
+          false otherwise.
+       */
+       virtual bool get_mouse_position (Duple& winpos) const = 0;
+
+       /** Signal to be used by items that need to track the mouse position
+          within the window.
+       */
+       sigc::signal<void,Duple const&> MouseMotion;
+
+       /** Ensures that the position given by @param winpos (in window
+           coordinates) is within the current window area, possibly reduced by
+           @param border.
+       */
+       Duple clamp_to_window (Duple const& winpos, Duple border = Duple());
 
         void zoomed();
     
         std::string indent() const;
         std::string render_indent() const;
         void dump (std::ostream&) const;
+
+       /** Ask the canvas to pick the current item again, and generate
+           an enter event for it.
+       */
+       virtual void re_enter () = 0;
     
 protected:
        void queue_draw_item_area (Item *, Rect);
        
-       /** our root group */
-       RootGroup _root;
-
-        Duple _scroll_offset;
+       /** our root item */
+       Root _root;
 
         virtual void pick_current_item (int state) = 0;
         virtual void pick_current_item (Duple const &, int state) = 0;
@@ -148,8 +169,15 @@ public:
        Cairo::RefPtr<Cairo::Context> context ();
 
        Rect visible_area () const;
+       Coord width() const;
+       Coord height() const;
+
+       bool get_mouse_position (Duple& winpos) const;
+
+       void re_enter ();
 
 protected:
+       bool on_scroll_event (GdkEventScroll *);
        bool on_expose_event (GdkEventExpose *);
        bool on_button_press_event (GdkEventButton *);
        bool on_button_release_event (GdkEventButton* event);