libs/gtkmm2ext/pixfader.cc

   1 /*
   2     Copyright (C) 2006 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: fastmeter.h 570 2006-06-07 21:21:21Z sampo $
  19 */
  20
  21
  22 #include <iostream>
  23 #include <gtkmm2ext/pixfader.h>
  24
  25 using namespace Gtkmm2ext;
  26 using namespace Gtk;
  27 using namespace Gdk;
  28 using namespace std;
  29
  30 #ifdef GTKOSX
  31 int PixFader::fine_scale_modifier = GDK_META_MASK;
  32 #else
  33 int PixFader::fine_scale_modifier = GDK_CONTROL_MASK;
  34 #endif
  35
  36 int PixFader::extra_fine_scale_modifier = GDK_MOD1_MASK;
  37
  38 PixFader::PixFader (Glib::RefPtr<Pixbuf> belt, Gtk::Adjustment& adj, int orientation)
  39
  40         : adjustment (adj),
  41           pixbuf (belt),
  42           _orien(orientation)
  43 {
  44         dragging = false;
  45         default_value = adjustment.get_value();
  46         last_drawn = -1;
  47
  48         view.x = 0;
  49         view.y = 0;
  50
  51         if (orientation == VERT) {
  52                 view.width = girth = pixbuf->get_width();
  53                 view.height = span = pixbuf->get_height() / 2;
  54                 unity_loc = (int) rint (view.height - (default_value * view.height)) - 1;
  55         } else {
  56                 view.width = span = pixbuf->get_width () / 2;
  57                 view.height = girth = pixbuf->get_height();
  58                 unity_loc = (int) rint (default_value * view.width) - 1;
  59         }
  60
  61         add_events (Gdk::BUTTON_PRESS_MASK|Gdk::BUTTON_RELEASE_MASK|Gdk::POINTER_MOTION_MASK|Gdk::SCROLL_MASK);
  62
  63         adjustment.signal_value_changed().connect (mem_fun (*this, &PixFader::adjustment_changed));
  64         adjustment.signal_changed().connect (mem_fun (*this, &PixFader::adjustment_changed));
  65 }
  66
  67 PixFader::~PixFader ()
  68 {
  69 }
  70
  71 bool
  72 PixFader::on_expose_event (GdkEventExpose* ev)
  73 {
  74         GdkRectangle intersection;
  75         int srcx, srcy, ds = display_span ();
  76         int offset_into_pixbuf = (int) floor (span / ((float) span / ds));
  77         Glib::RefPtr<Gdk::GC> fg_gc (get_style()->get_fg_gc(get_state()));
  78
  79         if (gdk_rectangle_intersect (&view, &ev->area, &intersection)) {
  80                 if (_orien == VERT) {
  81                         srcx = intersection.x;
  82                         srcy = offset_into_pixbuf + intersection.y;
  83                 } else {
  84                         srcx = offset_into_pixbuf + intersection.x;
  85                         srcy = intersection.y;
  86                 }
  87                 get_window()->draw_pixbuf (fg_gc, pixbuf,
  88                                            srcx, srcy,
  89                                            intersection.x, intersection.y,
  90                                            intersection.width, intersection.height,
  91                                            Gdk::RGB_DITHER_NONE, 0, 0);
  92
  93                 get_window()->draw_line (get_style()->get_bg_gc(STATE_ACTIVE), 0, 0, view.width - 1, 0); /* top */
  94                 get_window()->draw_line (get_style()->get_bg_gc(STATE_ACTIVE), 0, 0, 0, view.height - 1); /* left */
  95                 get_window()->draw_line (get_style()->get_bg_gc(STATE_NORMAL), view.width - 1, 0, view.width - 1, view.height - 1); /* right */
  96                 get_window()->draw_line (get_style()->get_bg_gc(STATE_NORMAL), 0, view.height - 1, view.width - 1, view.height - 1); /* bottom */
  97         }
  98
  99         /* always draw the line */
 100         if (_orien == VERT) {
 101                 get_window()->draw_line (fg_gc, 1, unity_loc, girth - 2, unity_loc);
 102         } else {
 103                 get_window()->draw_line (fg_gc, unity_loc, 1, unity_loc, girth - 2);
 104         }
 105         last_drawn = ds;
 106         return true;
 107 }
 108
 109 void
 110 PixFader::on_size_request (GtkRequisition* req)
 111 {
 112         req->width = view.width;
 113         req->height = view.height;
 114 }
 115
 116 bool
 117 PixFader::on_button_press_event (GdkEventButton* ev)
 118 {
 119         switch (ev->button) {
 120         case 1:
 121         case 2:
 122                 add_modal_grab();
 123                 grab_loc = (_orien == VERT) ? ev->y : ev->x;
 124                 grab_start = (_orien == VERT) ? ev->y : ev->x;
 125                 grab_window = ev->window;
 126                 dragging = true;
 127                 break;
 128         default:
 129                 break;
 130         }
 131
 132
 133         return false;
 134 }
 135
 136 bool
 137 PixFader::on_button_release_event (GdkEventButton* ev)
 138 {
 139         double fract, ev_pos;
 140
 141         ev_pos = (_orien == VERT) ? ev->y : ev->x;
 142
 143         switch (ev->button) {
 144         case 1:
 145                 if (dragging) {
 146                         remove_modal_grab();
 147                         dragging = false;
 148
 149                         if (ev_pos == grab_start) {
 150
 151                                 /* no motion - just a click */
 152
 153                                 if (ev->state & Gdk::SHIFT_MASK) {
 154                                         adjustment.set_value (default_value);
 155                                 } else if (ev->state & fine_scale_modifier) {
 156                                         adjustment.set_value (adjustment.get_lower());
 157                                 } else if ((_orien == VERT && ev_pos < span - display_span()) || (_orien == HORIZ && ev_pos > span - display_span())) {
 158                                         /* above the current display height, remember X Window coords */
 159                                         adjustment.set_value (adjustment.get_value() + adjustment.get_step_increment());
 160                                 } else {
 161                                         adjustment.set_value (adjustment.get_value() - adjustment.get_step_increment());
 162                                 }
 163                         }
 164
 165                 }
 166                 break;
 167
 168         case 2:
 169                 if (dragging) {
 170                         remove_modal_grab();
 171                         dragging = false;
 172
 173                         fract = 1.0 - (ev_pos / span); // inverted X Window coordinates, grrr
 174
 175                         fract = min (1.0, fract);
 176                         fract = max (0.0, fract);
 177
 178                         adjustment.set_value (fract * (adjustment.get_upper() - adjustment.get_lower()));
 179                 }
 180                 break;
 181
 182         default:
 183                 break;
 184         }
 185
 186         return false;
 187 }
 188
 189 bool
 190 PixFader::on_scroll_event (GdkEventScroll* ev)
 191 {
 192         double scale;
 193         bool ret = false;
 194
 195         if (ev->state & fine_scale_modifier) {
 196                 if (ev->state & extra_fine_scale_modifier) {
 197                         scale = 0.01;
 198                 } else {
 199                         scale = 0.05;
 200                 }
 201         } else {
 202                 scale = 0.25;
 203         }
 204
 205         if (_orien == VERT) {
 206
 207                 /* should left/right scroll affect vertical faders ? */
 208
 209                 switch (ev->direction) {
 210
 211                 case GDK_SCROLL_UP:
 212                         /* wheel up */
 213                         adjustment.set_value (adjustment.get_value() + (adjustment.get_page_increment() * scale));
 214                         ret = true;
 215                         break;
 216                 case GDK_SCROLL_DOWN:
 217                         /* wheel down */
 218                         adjustment.set_value (adjustment.get_value() - (adjustment.get_page_increment() * scale));
 219                         ret = true;
 220                         break;
 221                 default:
 222                         break;
 223                 }
 224         } else {
 225
 226                 /* up/down scrolls should definitely affect horizontal faders
 227                    because they are so much easier to use
 228                 */
 229
 230                 switch (ev->direction) {
 231
 232                 case GDK_SCROLL_RIGHT:
 233                 case GDK_SCROLL_UP:
 234                         /* wheel right */
 235                         adjustment.set_value (adjustment.get_value() + (adjustment.get_page_increment() * scale));
 236                         ret = true;
 237                         break;
 238                 case GDK_SCROLL_LEFT:
 239                 case GDK_SCROLL_DOWN:
 240                         /* wheel left */
 241                         adjustment.set_value (adjustment.get_value() - (adjustment.get_page_increment() * scale));
 242                         ret = true;
 243                         break;
 244                 default:
 245                         break;
 246                 }
 247         }
 248         return ret;
 249 }
 250
 251 bool
 252 PixFader::on_motion_notify_event (GdkEventMotion* ev)
 253 {
 254         if (dragging) {
 255                 double fract, delta, scale, ev_pos;
 256                  ev_pos = (_orien == VERT) ? ev->y : ev->x;
 257                 //cerr << "PixFader::on_motion_notify_event() called x:y = " << ev->x << ":" << ev->y;
 258                 if (ev->window != grab_window) {
 259                         grab_loc = ev_pos;
 260                         grab_window = ev->window;
 261                         return true;
 262                 }
 263
 264                 if (ev->state & fine_scale_modifier) {
 265                         if (ev->state & extra_fine_scale_modifier) {
 266                                 scale = 0.05;
 267                         } else {
 268                                 scale = 0.1;
 269                         }
 270                 } else {
 271                         scale = 1.0;
 272                 }
 273                 //cerr << " ev_pos=" << ev_pos << " grab_loc=" << grab_loc;
 274                 delta = ev_pos - grab_loc;
 275                 grab_loc = ev_pos;
 276
 277                 fract = (delta / span);
 278
 279                 fract = min (1.0, fract);
 280                 fract = max (-1.0, fract);
 281
 282                 // X Window is top->bottom for 0..Y
 283
 284                 if (_orien == VERT) {
 285                         fract = -fract;
 286                 }
 287
 288                 adjustment.set_value (adjustment.get_value() + scale * fract * (adjustment.get_upper() - adjustment.get_lower()));
 289                 //cerr << " adj=" << adjustment.get_value() << " fract=" << fract << " delta=" << delta << " scale=" << scale << endl;
 290         }
 291
 292         return true;
 293 }
 294
 295 void
 296 PixFader::adjustment_changed ()
 297 {
 298         if (display_span() != last_drawn) {
 299                 queue_draw ();
 300         }
 301 }
 302
 303 int
 304 PixFader::display_span ()
 305 {
 306         float fract = (adjustment.get_upper() - adjustment.get_value ()) / ((adjustment.get_upper() - adjustment.get_lower()));
 307         return (_orien == VERT) ? (int)floor (span * (1.0 - fract)) : (int)floor (span * fract);
 308 }
 309