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 #include "gtkmm2ext/keyboard.h"
  25
  26 using namespace Gtkmm2ext;
  27 using namespace Gtk;
  28 using namespace Gdk;
  29 using namespace std;
  30
  31
  32 int PixFader::fine_scale_modifier = Keyboard::PrimaryModifier;
  33 int PixFader::extra_fine_scale_modifier = Keyboard::SecondaryModifier;
  34
  35 PixFader::PixFader (Glib::RefPtr<Pixbuf> belt, Gtk::Adjustment& adj, int orientation, int fader_length)
  36
  37         : adjustment (adj),
  38           pixbuf (belt),
  39           _orien(orientation)
  40 {
  41         dragging = false;
  42         default_value = adjustment.get_value();
  43         last_drawn = -1;
  44
  45         view.x = 0;
  46         view.y = 0;
  47
  48         if (orientation == VERT) {
  49                 view.width = girth = pixbuf->get_width();
  50         } else {
  51                 view.height = girth = pixbuf->get_height();
  52         }
  53
  54         set_fader_length (fader_length);
  55
  56         add_events (Gdk::BUTTON_PRESS_MASK|Gdk::BUTTON_RELEASE_MASK|Gdk::POINTER_MOTION_MASK|Gdk::SCROLL_MASK|Gdk::ENTER_NOTIFY_MASK|Gdk::LEAVE_NOTIFY_MASK);
  57
  58         adjustment.signal_value_changed().connect (mem_fun (*this, &PixFader::adjustment_changed));
  59         adjustment.signal_changed().connect (mem_fun (*this, &PixFader::adjustment_changed));
  60 }
  61
  62 PixFader::~PixFader ()
  63 {
  64 }
  65
  66 bool
  67 PixFader::on_expose_event (GdkEventExpose* ev)
  68 {
  69         GdkRectangle intersection;
  70         int srcx, srcy;
  71
  72         int const ds = display_span ();
  73
  74         int offset_into_pixbuf = (int) floor (span / ((float) span / ds));
  75
  76         /* account for fader lengths that are shorter than the fader pixbuf */
  77         if (_orien == VERT) {
  78                 offset_into_pixbuf += pixbuf->get_height() / 2 - view.height;
  79         } else {
  80                 offset_into_pixbuf += pixbuf->get_width() / 2 - view.width;
  81         }
  82
  83         Glib::RefPtr<Gdk::GC> fg_gc (get_style()->get_fg_gc(get_state()));
  84
  85         if (gdk_rectangle_intersect (&view, &ev->area, &intersection)) {
  86                 if (_orien == VERT) {
  87                         srcx = intersection.x;
  88                         srcy = offset_into_pixbuf + intersection.y;
  89                 } else {
  90                         srcx = offset_into_pixbuf + intersection.x;
  91                         srcy = intersection.y;
  92                 }
  93                 get_window()->draw_pixbuf (fg_gc, pixbuf,
  94                                            srcx, srcy,
  95                                            intersection.x, intersection.y,
  96                                            intersection.width, intersection.height,
  97                                            Gdk::RGB_DITHER_NONE, 0, 0);
  98
  99                 get_window()->draw_line (get_style()->get_bg_gc(STATE_ACTIVE), 0, 0, view.width - 1, 0); /* top */
 100                 get_window()->draw_line (get_style()->get_bg_gc(STATE_ACTIVE), 0, 0, 0, view.height - 1); /* left */
 101                 get_window()->draw_line (get_style()->get_bg_gc(STATE_NORMAL), view.width - 1, 0, view.width - 1, view.height - 1); /* right */
 102                 get_window()->draw_line (get_style()->get_bg_gc(STATE_NORMAL), 0, view.height - 1, view.width - 1, view.height - 1); /* bottom */
 103         }
 104
 105         /* always draw the line */
 106         if (_orien == VERT) {
 107                 get_window()->draw_line (fg_gc, 1, unity_loc, girth - 2, unity_loc);
 108         } else {
 109                 get_window()->draw_line (fg_gc, unity_loc, 1, unity_loc, girth - 2);
 110         }
 111         last_drawn = ds;
 112         return true;
 113 }
 114
 115 void
 116 PixFader::on_size_request (GtkRequisition* req)
 117 {
 118         req->width = view.width;
 119         req->height = view.height;
 120 }
 121
 122 bool
 123 PixFader::on_button_press_event (GdkEventButton* ev)
 124 {
 125         switch (ev->button) {
 126         case 1:
 127         case 2:
 128                 add_modal_grab();
 129                 grab_loc = (_orien == VERT) ? ev->y : ev->x;
 130                 grab_start = (_orien == VERT) ? ev->y : ev->x;
 131                 grab_window = ev->window;
 132                 dragging = true;
 133                 break;
 134         default:
 135                 break;
 136         }
 137
 138
 139         return false;
 140 }
 141
 142 bool
 143 PixFader::on_button_release_event (GdkEventButton* ev)
 144 {
 145         double fract, ev_pos;
 146
 147         ev_pos = (_orien == VERT) ? ev->y : ev->x;
 148
 149         switch (ev->button) {
 150         case 1:
 151                 if (dragging) {
 152                         remove_modal_grab();
 153                         dragging = false;
 154
 155                         if (ev_pos == grab_start) {
 156
 157                                 /* no motion - just a click */
 158
 159                                 if (ev->state & Keyboard::TertiaryModifier) {
 160                                         adjustment.set_value (default_value);
 161                                 } else if (ev->state & fine_scale_modifier) {
 162                                         adjustment.set_value (adjustment.get_lower());
 163                                 } else if ((_orien == VERT && ev_pos < span - display_span()) || (_orien == HORIZ && ev_pos > span - display_span())) {
 164                                         /* above the current display height, remember X Window coords */
 165                                         adjustment.set_value (adjustment.get_value() + adjustment.get_step_increment());
 166                                 } else {
 167                                         adjustment.set_value (adjustment.get_value() - adjustment.get_step_increment());
 168                                 }
 169                         }
 170
 171                 }
 172                 break;
 173
 174         case 2:
 175                 if (dragging) {
 176                         remove_modal_grab();
 177                         dragging = false;
 178
 179                         fract = 1.0 - (ev_pos / span); // inverted X Window coordinates, grrr
 180
 181                         fract = min (1.0, fract);
 182                         fract = max (0.0, fract);
 183
 184                         adjustment.set_value (fract * (adjustment.get_upper() - adjustment.get_lower()));
 185                 }
 186                 break;
 187
 188         default:
 189                 break;
 190         }
 191
 192         return false;
 193 }
 194
 195 bool
 196 PixFader::on_scroll_event (GdkEventScroll* ev)
 197 {
 198         double scale;
 199         bool ret = false;
 200
 201         if (ev->state & fine_scale_modifier) {
 202                 if (ev->state & extra_fine_scale_modifier) {
 203                         scale = 0.01;
 204                 } else {
 205                         scale = 0.05;
 206                 }
 207         } else {
 208                 scale = 0.25;
 209         }
 210
 211         if (_orien == VERT) {
 212
 213                 /* should left/right scroll affect vertical faders ? */
 214
 215                 switch (ev->direction) {
 216
 217                 case GDK_SCROLL_UP:
 218                         adjustment.set_value (adjustment.get_value() + (adjustment.get_page_increment() * scale));
 219                         ret = true;
 220                         break;
 221                 case GDK_SCROLL_DOWN:
 222                         adjustment.set_value (adjustment.get_value() - (adjustment.get_page_increment() * scale));
 223                         ret = true;
 224                         break;
 225                 default:
 226                         break;
 227                 }
 228         } else {
 229
 230                 /* up/down scrolls should definitely affect horizontal faders
 231                    because they are so much easier to use
 232                 */
 233
 234                 switch (ev->direction) {
 235
 236                 case GDK_SCROLL_RIGHT:
 237                 case GDK_SCROLL_UP:
 238                         adjustment.set_value (adjustment.get_value() + (adjustment.get_page_increment() * scale));
 239                         ret = true;
 240                         break;
 241                 case GDK_SCROLL_LEFT:
 242                 case GDK_SCROLL_DOWN:
 243                         adjustment.set_value (adjustment.get_value() - (adjustment.get_page_increment() * scale));
 244                         ret = true;
 245                         break;
 246                 default:
 247                         break;
 248                 }
 249         }
 250         return ret;
 251 }
 252
 253 bool
 254 PixFader::on_motion_notify_event (GdkEventMotion* ev)
 255 {
 256         if (dragging) {
 257                 double fract, delta, scale, ev_pos;
 258                  ev_pos = (_orien == VERT) ? ev->y : ev->x;
 259                 //cerr << "PixFader::on_motion_notify_event() called x:y = " << ev->x << ":" << ev->y;
 260                 if (ev->window != grab_window) {
 261                         grab_loc = ev_pos;
 262                         grab_window = ev->window;
 263                         return true;
 264                 }
 265
 266                 if (ev->state & fine_scale_modifier) {
 267                         if (ev->state & extra_fine_scale_modifier) {
 268                                 scale = 0.05;
 269                         } else {
 270                                 scale = 0.1;
 271                         }
 272                 } else {
 273                         scale = 1.0;
 274                 }
 275                 //cerr << " ev_pos=" << ev_pos << " grab_loc=" << grab_loc;
 276                 delta = ev_pos - grab_loc;
 277                 grab_loc = ev_pos;
 278
 279                 fract = (delta / span);
 280
 281                 fract = min (1.0, fract);
 282                 fract = max (-1.0, fract);
 283
 284                 // X Window is top->bottom for 0..Y
 285
 286                 if (_orien == VERT) {
 287                         fract = -fract;
 288                 }
 289
 290                 adjustment.set_value (adjustment.get_value() + scale * fract * (adjustment.get_upper() - adjustment.get_lower()));
 291                 //cerr << " adj=" << adjustment.get_value() << " fract=" << fract << " delta=" << delta << " scale=" << scale << endl;
 292         }
 293
 294         return true;
 295 }
 296
 297 void
 298 PixFader::adjustment_changed ()
 299 {
 300         if (display_span() != last_drawn) {
 301                 queue_draw ();
 302         }
 303 }
 304
 305 /** @return pixel offset of the current value from the right or bottom of the fader */
 306 int
 307 PixFader::display_span ()
 308 {
 309         float fract = (adjustment.get_upper() - adjustment.get_value ()) / ((adjustment.get_upper() - adjustment.get_lower()));
 310         return (_orien == VERT) ? (int)floor (span * (1.0 - fract)) : (int)floor (span * fract);
 311 }
 312
 313 void
 314 PixFader::set_fader_length (int l)
 315 {
 316         if (_orien == VERT) {
 317                 view.height = span = l;
 318                 unity_loc = (int) rint (view.height - (default_value * view.height)) - 1;
 319         } else {
 320                 view.width = span = l;
 321                 unity_loc = (int) rint (default_value * view.width) - 1;
 322         }
 323
 324         queue_draw ();
 325 }
 326
 327 bool
 328 PixFader::on_enter_notify_event (GdkEventCrossing*)
 329 {
 330         Keyboard::magic_widget_grab_focus ();
 331         return false;
 332 }
 333
 334 bool
 335 PixFader::on_leave_notify_event (GdkEventCrossing*)
 336 {
 337         Keyboard::magic_widget_drop_focus();
 338         return false;
 339 }