Add tempo track and tempo_point widgets.

Region.H

@@ -53,6 +53,16 @@ protected:
 
 public:
 
+    Track_Widget ( )
+        {
+            _track = NULL;
+
+            _offset = _start = _end = 0;
+
+            _selected = false;
+        }
+
+
     Fl_Group * parent ( void ) const { return _track; }
 
     int scroll_x ( void ) const { return timeline.ts_to_x( timeline.xoffset ); }
@@ -63,7 +73,7 @@ public:
     int x ( void ) const { return _offset < timeline.xoffset ? -1 : min( 32767, _track->x() + timeline.ts_to_x( _offset - timeline.xoffset ) ); }
 //    int x ( void ) const { return (short)( _track->x() + timeline.ts_to_x( _offset - timeline.xoffset )); }
 
-    int w ( void ) const { return timeline.ts_to_x( _end - _start ); }
+    virtual int w ( void ) const { return timeline.ts_to_x( _end - _start ); }
 //    int w ( void ) const { return timeline.ts_to_x( (_end - _start) - ( timeline.xoffset - _offset) ); }
 
     Fl_Color color ( void ) { return _color; }
@@ -80,31 +90,101 @@ public:
     void start ( nframes_t v ) { _start = v; }
     nframes_t start ( void ) const { return _start; }
 
-    nframes_t length ( void ) const { return _end - _start; }
+    virtual nframes_t length ( void ) const { return _end - _start; }
 
+    /* just draw a simple box */
     virtual void
     draw ( int X, int Y, int W, int H )
         {
-            fl_draw_box( FL_FLAT_BOX, X, Y, W, H, _box_color );
+            fl_draw_box( FL_FLAT_BOX, x(), y(), w(), y(), _box_color );
         }
 
+    /* base hanlde just does basic dragging */
     virtual int
-    handle ( int m ) { return 0; }
+    handle ( int m )
+        {
+            static int ox, oy;
 
+            int X = Fl::event_x();
+            int Y = Fl::event_y();
 
+            switch ( m )
+            {
+                case FL_PUSH:
+                {
+                    ox = x() - X;
+                    oy = y() - Y;
+
+                    return 1;
+                }
+                case FL_RELEASE:
+                    fl_cursor( FL_CURSOR_DEFAULT );
+                    return 1;
+                case FL_DRAG:
+                {
+                    if ( ox + X >= _track->x() )
+                    {
+                        int nx = ox + X;
+
+                        _offset = timeline.x_to_ts( nx ) + timeline.xoffset;
+
+                        _track->snap( this );
+                    }
+
+                    _track->redraw();
+                    fl_cursor( FL_CURSOR_MOVE );
+
+                    return 1;
+                }
+                default:
+                    return 0;
+            }
+        }
 };
 
 
-class Tempo : public Track_Widget
+    class Tempo_Point : public Track_Widget
     {
         float _tempo;
 
+        static Fl_Boxtype box ( void ) { return FL_UP_BOX; }
+
+    public:
+
+        Tempo_Point ( )
+            {
+                _tempo = 120;
+                _offset = 0;
+                _start = 0;
+                _end = 300;
+            }
+
+        Tempo_Point ( nframes_t when, float bpm )
+            {
+                _tempo = bpm;
+                _offset = when;
+                _start = 0;
+                _end = 300;
+            }
+
+        int w ( void ) const { return 10; }
+        nframes_t length ( void ) const { return timeline.x_to_ts( w() ); }
+
         void
         draw ( int X, int Y, int W, int H )
             {
+                if ( x() < 0 )
+                    return;
 
+                fl_draw_box( box(), x(), Y, w(), H, _box_color );
 
+                char pat[40];
 
+                snprintf( pat, 40, "%.1f", _tempo );
+
+                fl_font( FL_HELVETICA, 14 );
+                fl_color( FL_YELLOW );
+                fl_draw( pat, x() +  w(), Y, w(), h(), FL_ALIGN_LEFT );
 
             }
 

main.C

@@ -132,6 +132,17 @@ main ( int argc, char **argv )
 
 //    Fl_Group *pack = new Fl_Group( 0, 0, 5000, 600 );
 
+    {
+        Track *tempo_track = new Track( 0, 0, 800, 24 );
+
+        tempo_track->label( "tempo map" );
+        tempo_track->add( new Tempo_Point );
+
+        tempo_track->add( new Tempo_Point( 56000, 250 ) );
+
+        tempo_track->end();
+    }
+
     Track *track1 = new Track( 40, 0, 800, 100 );
 
 //    pack->type( Fl_Pack::VERTICAL );
@@ -170,6 +181,7 @@ main ( int argc, char **argv )
 
     track2->add( wave2 );
 
+
     track2->end();
 
     track1->next( track2 );