gtk2_ardour/editor_cursors.cc

   1 /*
   2     Copyright (C) 2000 Paul Davis
   3
   4     This program is free software; you can redistribute it and/or modify
   5     it under the terms of the GNU General Public License as published by
   6     the Free Software Foundation; either version 2 of the License, or
   7     (at your option) any later version.
   8
   9     This program is distributed in the hope that it will be useful,
  10     but WITHOUT ANY WARRANTY; without even the implied warranty of
  11     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12     GNU General Public License for more details.
  13
  14     You should have received a copy of the GNU General Public License
  15     along with this program; if not, write to the Free Software
  16     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  17
  18     $Id$
  19 */
  20
  21 #include <cstdlib>
  22 #include <cmath>
  23
  24 #include <gtk-canvas.h>
  25
  26 #include "utils.h"
  27 #include "editor.h"
  28
  29 using namespace SigC;
  30 using namespace ARDOUR;
  31 using namespace Gtk;
  32
  33 Editor::Cursor::Cursor (Editor& ed, const string& color, GtkSignalFunc callbck)
  34         : editor (ed), callback (callbck), length(1.0)
  35 {
  36         GtkCanvasGroup *group;
  37         points = gtk_canvas_points_new (2);
  38
  39         /* "randomly" initialize coords */
  40
  41         points->coords[0] = -9383839.0;
  42         points->coords[1] = 0.0;
  43         points->coords[2] = 1.0;
  44         points->coords[3] = 0.0;
  45
  46         group = GTK_CANVAS_GROUP (editor.cursor_group);
  47
  48         // cerr << "set cursor points, nc = " << points->num_points << endl;
  49         canvas_item = gtk_canvas_item_new (group,
  50                                            gtk_canvas_line_get_type(),
  51                                            "points", points,
  52                                            "fill_color", color.c_str(),
  53                                            "width_pixels", 1,
  54                                            "first_arrowhead", (gboolean) TRUE,
  55                                            "last_arrowhead", (gboolean) TRUE,
  56                                            "arrow_shape_a", 11.0,
  57                                            "arrow_shape_b", 0.0,
  58                                            "arrow_shape_c", 9.0,
  59                                            NULL);
  60
  61         // cerr << "cursor line @ " << canvas_item << endl;
  62
  63         gtk_object_set_data (GTK_OBJECT(canvas_item), "cursor", this);
  64         gtk_signal_connect (GTK_OBJECT(canvas_item), "event", callback, &editor);
  65
  66         current_frame = 1; /* force redraw at 0 */
  67 }
  68
  69 Editor::Cursor::~Cursor ()
  70
  71 {
  72         gtk_object_destroy (GTK_OBJECT(canvas_item));
  73         gtk_canvas_points_unref (points);
  74 }
  75
  76 void
  77 Editor::Cursor::set_position (jack_nframes_t frame)
  78 {
  79         double new_pos =  editor.frame_to_unit (frame);
  80
  81         if (editor.session == 0) {
  82                 gtk_canvas_item_hide (canvas_item);
  83         } else {
  84                 gtk_canvas_item_show (canvas_item);
  85         }
  86
  87         current_frame = frame;
  88
  89         if (new_pos == points->coords[0]) {
  90
  91                 /* change in position is not visible, so just raise it */
  92
  93                 gtk_canvas_item_raise_to_top (canvas_item);
  94                 return;
  95         }
  96
  97         points->coords[0] = new_pos;
  98         points->coords[2] = new_pos;
  99
 100         // cerr << "set cursor2 al points, nc = " << points->num_points << endl;
 101         gtk_canvas_item_set (canvas_item, "points", points, NULL);
 102         gtk_canvas_item_raise_to_top (canvas_item);
 103 }
 104
 105 void
 106 Editor::Cursor::set_length (double units)
 107 {
 108         length = units;
 109         points->coords[3] = points->coords[1] + length;
 110         // cerr << "set cursor3 al points, nc = " << points->num_points << endl;
 111         gtk_canvas_item_set (canvas_item, "points", points, NULL);
 112 }
 113
 114 void
 115 Editor::Cursor::set_y_axis (double position)
 116 {
 117         points->coords[1] = position;
 118         points->coords[3] = position + length;
 119         // cerr << "set cursor4 al points, nc = " << points->num_points << endl;
 120         gtk_canvas_item_set (canvas_item, "points", points, NULL);
 121 }