gtk2_ardour/panner.cc

   1 /*
   2     Copyright (C) 2000-2007 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 */
  19
  20 #include <iostream>
  21
  22 #include "panner.h"
  23
  24 using namespace std;
  25
  26 static const int triangle_size = 5;
  27
  28 static void
  29 null_label_callback (char* buf, unsigned int bufsize)
  30 {
  31         /* no label */
  32
  33         buf[0] = '\0';
  34 }
  35
  36
  37 PannerBar::PannerBar (Gtk::Adjustment& adj, PBD::Controllable& c)
  38         : BarController (adj, c, sigc::ptr_fun (null_label_callback))
  39 {
  40         set_style (BarController::Line);
  41 }
  42
  43 PannerBar::~PannerBar ()
  44 {
  45 }
  46
  47 bool
  48 PannerBar::expose (GdkEventExpose* ev)
  49 {
  50         Glib::RefPtr<Gdk::Window> win (darea.get_window());
  51         Glib::RefPtr<Gdk::GC> gc (get_style()->get_base_gc (get_state()));
  52
  53         BarController::expose (ev);
  54
  55         /* now draw triangles for left, right and center */
  56
  57         GdkPoint points[3];
  58
  59         // left
  60
  61         points[0].x = 0;
  62         points[0].y = 0;
  63
  64         points[1].x = triangle_size;
  65         points[1].y = 0;
  66
  67         points[2].x = 0;
  68         points[2].y = triangle_size;
  69
  70         gdk_draw_polygon (win->gobj(), gc->gobj(), true, points, 3);
  71
  72         // center
  73
  74         points[0].x = (darea.get_width()/2 - triangle_size);
  75         points[0].y = 0;
  76
  77         points[1].x = (darea.get_width()/2 + triangle_size);
  78         points[1].y = 0;
  79
  80         points[2].x = darea.get_width()/2;
  81         points[2].y = triangle_size - 1;
  82
  83         gdk_draw_polygon (win->gobj(), gc->gobj(), true, points, 3);
  84
  85         // right
  86
  87         points[0].x = (darea.get_width() - triangle_size);
  88         points[0].y = 0;
  89
  90         points[1].x = darea.get_width();
  91         points[1].y = 0;
  92
  93         points[2].x = darea.get_width();
  94         points[2].y = triangle_size;
  95
  96         gdk_draw_polygon (win->gobj(), gc->gobj(), true, points, 3);
  97
  98         return true;
  99 }
 100
 101 bool
 102 PannerBar::button_press (GdkEventButton* ev)
 103 {
 104         if (ev->button == 1 && ev->type == GDK_BUTTON_PRESS && ev->y < 10) {
 105                 if (ev->x < triangle_size) {
 106                         adjustment.set_value (adjustment.get_lower());
 107                 } else if (ev->x > (darea.get_width() - triangle_size)) {
 108                         adjustment.set_value (adjustment.get_upper());
 109                 } else if (ev->x > (darea.get_width()/2 - triangle_size) &&
 110                            ev->x < (darea.get_width()/2 + triangle_size)) {
 111                         adjustment.set_value (adjustment.get_lower() + ((adjustment.get_upper() - adjustment.get_lower()) / 2.0));
 112                 }
 113         }
 114
 115         return BarController::button_press (ev);
 116 }
 117
 118 bool
 119 PannerBar::button_release (GdkEventButton* ev)
 120 {
 121         return BarController::button_release (ev);
 122 }
 123