Add playhead to the GUI.

Timeline/Engine.C

@@ -18,6 +18,7 @@
 /*******************************************************************************/
 
 #include "Engine.H"
+#include "Transport.H"
 
 #include "Timeline.H" // for process()
 
@@ -101,12 +102,9 @@ Engine::sync ( jack_transport_state_t state, jack_position_t *pos )
 int
 Engine::process ( nframes_t nframes )
 {
-    jack_position_t pos;
+    transport.poll();
-    jack_transport_state_t ts;
 
-    ts = jack_transport_query( _client, &pos );
+    if ( ! transport.rolling )
-
-    if ( ts != JackTransportRolling )
         return 0;
 
     if ( ! trylock() )

Timeline/Engine.H

@@ -50,6 +50,7 @@ class Engine : public Mutex
 private:
 
     friend class Port;
+    friend class Transport;
     jack_client_t * client ( void ) { return _client; }
 
 public:

Timeline/Makefile

@@ -14,6 +14,7 @@ SRCS= \
       Port.C \
       Disk_Stream.C \
       Engine.C \
+      Transport.C \
       Loggable.C \
 
 OBJS=$(SRCS:.C=.o)

Timeline/Timeline.C

@@ -29,9 +29,13 @@
 
 #include "Track_Header.H"
 
+const float UPDATE_FREQ = 0.02f;
+
 
 #include "Disk_Stream.H"
 
+#include "Transport.H"
+
 void
 Timeline::cb_scroll ( Fl_Widget *w, void *v )
 {
@@ -178,6 +182,7 @@ Timeline::Timeline ( int X, int Y, int W, int H, const char* L ) : Fl_Overlay_Wi
 
     }
 
+
     /* make sure scrollbars are on top */
     add( vscroll );
     add( hscroll );
@@ -187,6 +192,9 @@ Timeline::Timeline ( int X, int Y, int W, int H, const char* L ) : Fl_Overlay_Wi
     redraw();
 
     end();
+
+    Fl::add_timeout( UPDATE_FREQ, update_cb, this );
+
 }
 
 
@@ -446,9 +454,43 @@ Timeline::draw ( void )
 
 }
 
+void
+Timeline::draw_playhead ( void )
+{
+    int x = ( ts_to_x( transport.frame ) - ts_to_x( xoffset ) ) + tracks->x() + Track_Header::width();
+
+    if ( x < 0 || x > tracks->w() )
+        return;
+
+    fl_color( FL_RED );
+
+    fl_line( x, rulers->y() + rulers->h(), x, rulers->y() + rulers->h() + tracks->h() );
+}
+
+void
+Timeline::redraw_playhead ( void )
+{
+    redraw_overlay();
+}
+
+
+/** called so many times a second to redraw the playhead etc.  */
+void
+Timeline::update_cb ( void *arg )
+{
+    Fl::repeat_timeout( UPDATE_FREQ, update_cb, arg );
+
+    Timeline *tl = (Timeline *)arg;
+
+    tl->redraw_playhead();
+}
+
 void
 Timeline::draw_overlay ( void )
 {
+
+    draw_playhead();
+
     if ( ! ( _selection.w && _selection.h ) )
         return;
 

Timeline/Timeline.H

@@ -138,9 +138,12 @@ public:
     void draw_measure_lines ( int X, int Y, int W, int H, Fl_Color color );
     void xposition ( int X );
     void yposition ( int Y );
+    void draw_playhead ( void );
+    void redraw_playhead ( void );
     void draw ( void );
     void draw_overlay ( void );
     int handle ( int m );
+    static void update_cb ( void *arg );
 
     void select( const Rectangle &r );
 

Timeline/Transport.C

@@ -0,0 +1,33 @@
+
+/*******************************************************************************/
+/* Copyright (C) 2008 Jonathan Moore Liles                                     */
+/*                                                                             */
+/* This program is free software; you can redistribute it and/or modify it     */
+/* under the terms of the GNU General Public License as published by the       */
+/* Free Software Foundation; either version 2 of the License, or (at your      */
+/* option) any later version.                                                  */
+/*                                                                             */
+/* This program is distributed in the hope that it will be useful, but WITHOUT */
+/* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or       */
+/* FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for   */
+/* more details.                                                               */
+/*                                                                             */
+/* You should have received a copy of the GNU General Public License along     */
+/* with This program; see the file COPYING.  If not,write to the Free Software */
+/* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
+/*******************************************************************************/
+
+#include "Transport.H"
+#include "Engine.H"
+
+Transport transport;
+
+void
+Transport::poll ( void )
+{
+    jack_transport_state_t ts;
+
+    ts = jack_transport_query( engine->client(), this );
+
+    rolling = ts == JackTransportRolling;
+}

Timeline/Transport.H

@@ -0,0 +1,32 @@
+
+/*******************************************************************************/
+/* Copyright (C) 2008 Jonathan Moore Liles                                     */
+/*                                                                             */
+/* This program is free software; you can redistribute it and/or modify it     */
+/* under the terms of the GNU General Public License as published by the       */
+/* Free Software Foundation; either version 2 of the License, or (at your      */
+/* option) any later version.                                                  */
+/*                                                                             */
+/* This program is distributed in the hope that it will be useful, but WITHOUT */
+/* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or       */
+/* FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for   */
+/* more details.                                                               */
+/*                                                                             */
+/* You should have received a copy of the GNU General Public License along     */
+/* with This program; see the file COPYING.  If not,write to the Free Software */
+/* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
+/*******************************************************************************/
+
+#pragma once
+
+#include <jack/transport.h>
+#include "types.h"
+
+struct Transport : public jack_position_t
+{
+    bool rolling;
+
+    void poll ( void );
+};
+
+extern Transport transport;