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, int fader_length)
  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         } else {
  54                 view.height = girth = pixbuf->get_height();
  55         }
  56
  57         set_fader_length (fader_length);
  58
  59         add_events (Gdk::BUTTON_PRESS_MASK|Gdk::BUTTON_RELEASE_MASK|Gdk::POINTER_MOTION_MASK|Gdk::SCROLL_MASK);
  60
  61         adjustment.signal_value_changed().connect (mem_fun (*this, &PixFader::adjustment_changed));
  62         adjustment.signal_changed().connect (mem_fun (*this, &PixFader::adjustment_changed));
  63 }
  64
  65 PixFader::~PixFader ()
  66 {
  67 }
  68
  69 bool
  70 PixFader::on_expose_event (GdkEventExpose* ev)
  71 {
  72         GdkRectangle intersection;
  73         int srcx, srcy;
  74
  75         int const ds = display_span ();
  76
  77         int offset_into_pixbuf = (int) floor (span / ((float) span / ds));
  78
  79         /* account for fader lengths that are shorter than the fader pixbuf */
  80         if (_orien == VERT) {
  81                 offset_into_pixbuf += pixbuf->get_height() / 2 - view.height;
  82         } else {
  83                 offset_into_pixbuf += pixbuf->get_width() / 2 - view.width;
  84         }
  85
  86         Glib::RefPtr<Gdk::GC> fg_gc (get_style()->get_fg_gc(get_state()));
  87
  88         if (gdk_rectangle_intersect (&view, &ev->area, &intersection)) {
  89                 if (_orien == VERT) {
  90                         srcx = intersection.x;
  91                         srcy = offset_into_pixbuf + intersection.y;
  92                 } else {
  93                         srcx = offset_into_pixbuf + intersection.x;
  94                         srcy = intersection.y;
  95                 }
  96                 get_window()->draw_pixbuf (fg_gc, pixbuf,
  97                                            srcx, srcy,
  98                                            intersection.x, intersection.y,
  99                                            intersection.width, intersection.height,
 100                                            Gdk::RGB_DITHER_NONE, 0, 0);
 101
 102                 get_window()->draw_line (get_style()->get_bg_gc(STATE_ACTIVE), 0, 0, view.width - 1, 0); /* top */
 103                 get_window()->draw_line (get_style()->get_bg_gc(STATE_ACTIVE), 0, 0, 0, view.height - 1); /* left */
 104                 get_window()->draw_line (get_style()->get_bg_gc(STATE_NORMAL), view.width - 1, 0, view.width - 1, view.height - 1); /* right */
 105                 get_window()->draw_line (get_style()->get_bg_gc(STATE_NORMAL), 0, view.height - 1, view.width - 1, view.height - 1); /* bottom */
 106         }
 107
 108         /* always draw the line */
 109         if (_orien == VERT) {
 110                 get_window()->draw_line (fg_gc, 1, unity_loc, girth - 2, unity_loc);
 111         } else {
 112                 get_window()->draw_line (fg_gc, unity_loc, 1, unity_loc, girth - 2);
 113         }
 114         last_drawn = ds;
 115         return true;
 116 }
 117
 118 void
 119 PixFader::on_size_request (GtkRequisition* req)
 120 {
 121         req->width = view.width;
 122         req->height = view.height;
 123 }
 124
 125 bool
 126 PixFader::on_button_press_event (GdkEventButton* ev)
 127 {
 128         switch (ev->button) {
 129         case 1:
 130         case 2:
 131                 add_modal_grab();
 132                 grab_loc = (_orien == VERT) ? ev->y : ev->x;
 133                 grab_start = (_orien == VERT) ? ev->y : ev->x;
 134                 grab_window = ev->window;
 135                 dragging = true;
 136                 break;
 137         default:
 138                 break;
 139         }
 140
 141
 142         return false;
 143 }
 144
 145 bool
 146 PixFader::on_button_release_event (GdkEventButton* ev)
 147 {
 148         double fract, ev_pos;
 149
 150         ev_pos = (_orien == VERT) ? ev->y : ev->x;
 151
 152         switch (ev->button) {
 153         case 1:
 154                 if (dragging) {
 155                         remove_modal_grab();
 156                         dragging = false;
 157
 158                         if (ev_pos == grab_start) {
 159
 160                                 /* no motion - just a click */
 161
 162                                 if (ev->state & Gdk::SHIFT_MASK) {
 163                                         cerr << "SV A\n";
 164                                         adjustment.set_value (default_value);
 165                                         cerr << "SV A OUT\n";
 166                                 } else if (ev->state & fine_scale_modifier) {
 167                                         cerr << "SV B\n";
 168                                         adjustment.set_value (adjustment.get_lower());
 169                                         cerr << "SV B OUT\n";
 170                                 } else if ((_orien == VERT && ev_pos < span - display_span()) || (_orien == HORIZ && ev_pos > span - display_span())) {
 171                                         /* above the current display height, remember X Window coords */
 172                                         cerr << "SV C\n";
 173                                         adjustment.set_value (adjustment.get_value() + adjustment.get_step_increment());
 174                                         cerr << "SV C OUT\n";
 175                                 } else {
 176                                         cerr << "SV D\n";
 177                                         adjustment.set_value (adjustment.get_value() - adjustment.get_step_increment());
 178                                         cerr << "SV D OUT\n";
 179                                 }
 180                         }
 181
 182                 }
 183                 break;
 184
 185         case 2:
 186                 if (dragging) {
 187                         remove_modal_grab();
 188                         dragging = false;
 189
 190                         fract = 1.0 - (ev_pos / span); // inverted X Window coordinates, grrr
 191
 192                         fract = min (1.0, fract);
 193                         fract = max (0.0, fract);
 194
 195                         adjustment.set_value (fract * (adjustment.get_upper() - adjustment.get_lower()));
 196                 }
 197                 break;
 198
 199         default:
 200                 break;
 201         }
 202
 203         return false;
 204 }
 205
 206 bool
 207 PixFader::on_scroll_event (GdkEventScroll* ev)
 208 {
 209         double scale;
 210         bool ret = false;
 211
 212         if (ev->state & fine_scale_modifier) {
 213                 if (ev->state & extra_fine_scale_modifier) {
 214                         scale = 0.01;
 215                 } else {
 216                         scale = 0.05;
 217                 }
 218         } else {
 219                 scale = 0.25;
 220         }
 221
 222         if (_orien == VERT) {
 223
 224                 /* should left/right scroll affect vertical faders ? */
 225
 226                 switch (ev->direction) {
 227
 228                 case GDK_SCROLL_UP:
 229                         /* wheel up */
 230                         adjustment.set_value (adjustment.get_value() + (adjustment.get_page_increment() * scale));
 231                         ret = true;
 232                         break;
 233                 case GDK_SCROLL_DOWN:
 234                         /* wheel down */
 235                         adjustment.set_value (adjustment.get_value() - (adjustment.get_page_increment() * scale));
 236                         ret = true;
 237                         break;
 238                 default:
 239                         break;
 240                 }
 241         } else {
 242
 243                 /* up/down scrolls should definitely affect horizontal faders
 244                    because they are so much easier to use
 245                 */
 246
 247                 switch (ev->direction) {
 248
 249                 case GDK_SCROLL_RIGHT:
 250                 case GDK_SCROLL_UP:
 251                         /* wheel right */
 252                         adjustment.set_value (adjustment.get_value() + (adjustment.get_page_increment() * scale));
 253                         ret = true;
 254                         break;
 255                 case GDK_SCROLL_LEFT:
 256                 case GDK_SCROLL_DOWN:
 257                         /* wheel left */
 258                         adjustment.set_value (adjustment.get_value() - (adjustment.get_page_increment() * scale));
 259                         ret = true;
 260                         break;
 261                 default:
 262                         break;
 263                 }
 264         }
 265         return ret;
 266 }
 267
 268 bool
 269 PixFader::on_motion_notify_event (GdkEventMotion* ev)
 270 {
 271         if (dragging) {
 272                 double fract, delta, scale, ev_pos;
 273                  ev_pos = (_orien == VERT) ? ev->y : ev->x;
 274                 //cerr << "PixFader::on_motion_notify_event() called x:y = " << ev->x << ":" << ev->y;
 275                 if (ev->window != grab_window) {
 276                         grab_loc = ev_pos;
 277                         grab_window = ev->window;
 278                         return true;
 279                 }
 280
 281                 if (ev->state & fine_scale_modifier) {
 282                         if (ev->state & extra_fine_scale_modifier) {
 283                                 scale = 0.05;
 284                         } else {
 285                                 scale = 0.1;
 286                         }
 287                 } else {
 288                         scale = 1.0;
 289                 }
 290                 //cerr << " ev_pos=" << ev_pos << " grab_loc=" << grab_loc;
 291                 delta = ev_pos - grab_loc;
 292                 grab_loc = ev_pos;
 293
 294                 fract = (delta / span);
 295
 296                 fract = min (1.0, fract);
 297                 fract = max (-1.0, fract);
 298
 299                 // X Window is top->bottom for 0..Y
 300
 301                 if (_orien == VERT) {
 302                         fract = -fract;
 303                 }
 304
 305                 adjustment.set_value (adjustment.get_value() + scale * fract * (adjustment.get_upper() - adjustment.get_lower()));
 306                 //cerr << " adj=" << adjustment.get_value() << " fract=" << fract << " delta=" << delta << " scale=" << scale << endl;
 307         }
 308
 309         return true;
 310 }
 311
 312 void
 313 PixFader::adjustment_changed ()
 314 {
 315         if (display_span() != last_drawn) {
 316                 queue_draw ();
 317         }
 318 }
 319
 320 /** @return pixel offset of the current value from the right or bottom of the fader */
 321 int
 322 PixFader::display_span ()
 323 {
 324         float fract = (adjustment.get_upper() - adjustment.get_value ()) / ((adjustment.get_upper() - adjustment.get_lower()));
 325         return (_orien == VERT) ? (int)floor (span * (1.0 - fract)) : (int)floor (span * fract);
 326 }
 327
 328 void
 329 PixFader::set_fader_length (int l)
 330 {
 331         if (_orien == VERT) {
 332                 view.height = span = l;
 333                 unity_loc = (int) rint (view.height - (default_value * view.height)) - 1;
 334         } else {
 335                 view.width = span = l;
 336                 unity_loc = (int) rint (default_value * view.width) - 1;
 337         }
 338
 339         queue_draw ();
 340 }