Don't allow transport relocation while recording.

Timeline/Transport.C

@@ -79,50 +79,64 @@ Transport::cb_button ( Fl_Widget *w, void *v )
 }
 
 void
-Transport::cb_button ( Fl_Widget *w )
+Transport::update_record_state ( void )
 {
-    if ( w == _home_button )
-        locate( 0 );
-    if ( w == _end_button )
-        locate( timeline->length() );
-    else if ( w == _play_button )
-        toggle();
-    else if ( w == _record_button )
-    {
-        if ( _record_button->value() )
+    Fl_Button *w = _record_button;
+
+    /* handle display */
+    if ( w->value() )
         w->labelcolor( FL_RED );
     else
         w->labelcolor( fl_color_average( FL_RED, FL_WHITE, 0.25f ) );
 
-        redraw();
+    w->redraw();
 
+    /* this covers the case where the record toggle button is
+     * pressed while the transport is already rolling. Recording
+     * should begin or end on the next frame */
     if ( rolling )
     {
-            if ( _record_button->value() )
+        if ( w->value() )
+        {
             timeline->record();
+            recording = true;
+        }
         else
+        {
             timeline->stop();
+            recording = false;
         }
     }
 }
 
+/** cb_button
+ * common handler for all transport buttons */
+void
+Transport::cb_button ( Fl_Widget *w )
+{
+    if ( w == _home_button )
+        locate( 0 );
+    else if ( w == _end_button )
+        locate( timeline->length() );
+    else if ( w == _play_button )
+        toggle();
+    else if ( w == _record_button )
+        update_record_state();
+}
+
+void
+Transport::toggle_record ( void )
+{
+    _record_button->value( ! _record_button->value() );
+     update_record_state();
+}
+
 bool
 Transport::rec_enabled ( void ) const
 {
     return _record_button->value();
 }
 
-void
-Transport::toggle_record ( void )
-{
-    if ( _record_button->value() )
-        _record_button->value( 0 );
-    else
-        _record_button->value( 1 );
-
-    _record_button->do_callback();
-}
-
 int
 Transport::handle ( int m )
 {
@@ -132,7 +146,6 @@ Transport::handle ( int m )
         return 0;
     else
         return Fl_Pack::handle( m );
-
 }
 
 /***********/
@@ -152,6 +165,8 @@ Transport::poll ( void )
 void
 Transport::locate ( nframes_t frame )
 {
+    if ( ! recording )
+        // don't allow seeking while record is in progress
         jack_transport_locate( client, frame );
 }
 
@@ -161,7 +176,10 @@ Transport::start ( void )
 {
 //    MESSAGE( "Starting transport" );
     if ( _record_button->value() )
-        timeline->record();
+    {
+        rolling = true;
+        update_record_state();
+    }
 
     jack_transport_start( client );
 }
@@ -171,7 +189,10 @@ Transport::stop ( void )
 {
 //    MESSAGE( "Stopping transport" );
     if ( _record_button->value() )
-        toggle_record();
+    {
+        _record_button->value( 0 );
+        update_record_state();
+    }
 
     jack_transport_stop( client );
 }

Timeline/Transport.H

@@ -47,6 +47,8 @@ private:
     Fl_Button *_play_button;
     Fl_Button *_record_button;
 
+    void update_record_state ( void );
+
 public:
 
     Transport ( int X, int Y, int W, int H, const char *L=0 );