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 #include "gtkmm2ext/rgb_macros.h"
  26 #include "gtkmm2ext/utils.h"
  27
  28 using namespace Gtkmm2ext;
  29 using namespace Gtk;
  30 using namespace std;
  31
  32 #define CORNER_RADIUS 4
  33 #define FADER_RESERVE (2*CORNER_RADIUS)
  34
  35 PixFader::PixFader (
  36         Glib::RefPtr<Gdk::Pixbuf> belt,
  37         Glib::RefPtr<Gdk::Pixbuf> belt_desensitised,
  38         Gtk::Adjustment& adj,
  39         int orientation,
  40         int fader_length
  41         )
  42         : adjustment (adj),
  43           _orien(orientation)
  44 {
  45         pixbuf[NORMAL] = belt;
  46         pixbuf[DESENSITISED] = belt_desensitised;
  47
  48         pattern = 0;
  49         shine_pattern = 0;
  50
  51         _hovering = false;
  52         dragging = false;
  53         default_value = adjustment.get_value();
  54         last_drawn = -1;
  55
  56         view.x = 0;
  57         view.y = 0;
  58
  59         if (orientation == VERT) {
  60                 view.width = girth = 24;
  61         } else {
  62                 view.height = girth = 24;
  63         }
  64
  65         set_fader_length (fader_length);
  66
  67         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);
  68
  69         adjustment.signal_value_changed().connect (mem_fun (*this, &PixFader::adjustment_changed));
  70         adjustment.signal_changed().connect (mem_fun (*this, &PixFader::adjustment_changed));
  71
  72         for (int i = 0; i < STATES; ++i) {
  73                 Cairo::Format format;
  74
  75                 if (pixbuf[i]->get_has_alpha()) {
  76                         format = Cairo::FORMAT_ARGB32;
  77                 } else {
  78                         format = Cairo::FORMAT_RGB24;
  79                 }
  80
  81                 belt_surface[i] = Cairo::ImageSurface::create (format, pixbuf[i]->get_width(), pixbuf[i]->get_height());
  82                 belt_context[i] = Cairo::Context::create (belt_surface[i]);
  83                 Gdk::Cairo::set_source_pixbuf (belt_context[i], pixbuf[i], 0.0, 0.0);
  84                 belt_context[i]->paint();
  85         }
  86
  87         left_r = 0;
  88         left_g = 0;
  89         left_b = 0;
  90
  91         right_r = 0;
  92         right_g = 0;
  93         right_b = 0;
  94 }
  95
  96 PixFader::~PixFader ()
  97 {
  98 }
  99
 100 void
 101 PixFader::set_border_colors (uint32_t left, uint32_t right)
 102 {
 103         int r, g, b;
 104         UINT_TO_RGB(left, &r, &g, &b);
 105         left_r = r/255.0;
 106         left_g = g/255.0;
 107         left_b = b/255.0;
 108         UINT_TO_RGB(right, &r, &g, &b);
 109         right_r = r/255.0;
 110         right_g = g/255.0;
 111         right_b = b/255.0;
 112 }
 113
 114 void
 115 PixFader::create_patterns ()
 116 {
 117         Gdk::Color c = get_style()->get_fg (get_state());
 118     float r, g, b;
 119         r = c.get_red_p ();
 120         g = c.get_green_p ();
 121         b = c.get_blue_p ();
 122
 123         if (_orien == VERT) {
 124                 pattern = cairo_pattern_create_linear (0.0, 0.0, get_width(), 0);
 125                 cairo_pattern_add_color_stop_rgba (pattern, 0, r*0.8,g*0.8,b*0.8, 1.0);
 126                 cairo_pattern_add_color_stop_rgba (pattern, 1, r*0.6,g*0.6,b*0.6, 1.0);
 127
 128                 shine_pattern = cairo_pattern_create_linear (0.0, 0.0, 15, 0);
 129                 cairo_pattern_add_color_stop_rgba (shine_pattern, 0, 1,1,1,0.0);
 130                 cairo_pattern_add_color_stop_rgba (shine_pattern, 0.2, 1,1,1,0.3);
 131                 cairo_pattern_add_color_stop_rgba (shine_pattern, 0.5, 1,1,1,0.0);
 132                 cairo_pattern_add_color_stop_rgba (shine_pattern, 1, 1,1,1,0.0);
 133         } else {
 134                 float rheight = get_height();
 135
 136                 pattern = cairo_pattern_create_linear (0.0, 0.0, 0.0, rheight);
 137                 cairo_pattern_add_color_stop_rgba (pattern, 0, r*0.8,g*0.8,b*0.8, 1.0);
 138                 cairo_pattern_add_color_stop_rgba (pattern, 1, r*0.6,g*0.6,b*0.6, 1.0);
 139
 140                 shine_pattern = cairo_pattern_create_linear (0.0, 0.0, 0.0, rheight);
 141                 cairo_pattern_add_color_stop_rgba (shine_pattern, 0, 1,1,1,0.0);
 142                 cairo_pattern_add_color_stop_rgba (shine_pattern, 0.2, 1,1,1,0.3);
 143                 cairo_pattern_add_color_stop_rgba (shine_pattern, 0.5, 1,1,1,0.0);
 144                 cairo_pattern_add_color_stop_rgba (shine_pattern, 1, 1,1,1,0.0);
 145         }
 146
 147 }
 148
 149 bool
 150 PixFader::on_expose_event (GdkEventExpose* ev)
 151 {
 152         Cairo::RefPtr<Cairo::Context> context = get_window()->create_cairo_context();
 153         cairo_t* cr = context->cobj();
 154
 155         if (!pattern) {
 156                 create_patterns();
 157         }
 158
 159 //      int const pi = get_sensitive() ? NORMAL : DESENSITISED;
 160
 161         int ds = display_span ();
 162
 163         float w = get_width();
 164         float h = get_height();
 165         float radius = CORNER_RADIUS;
 166
 167         /* black border */
 168
 169         cairo_set_source_rgb (cr, 0,0,0);
 170         cairo_rectangle (cr, 0, 0, w, h);
 171         cairo_fill (cr);
 172
 173         /* draw active box */
 174
 175         if (_orien == VERT) {
 176                 if (ds > h - FADER_RESERVE)
 177                         ds = h - FADER_RESERVE;
 178
 179                 cairo_set_source (cr, pattern);
 180                 Gtkmm2ext::rounded_rectangle (cr, 1, 1+ds, w-2, h-(1+ds)-1, radius-1.5);
 181                 cairo_fill (cr);
 182
 183 //              cairo_set_source (cr, shine_pattern);
 184 //              Gtkmm2ext::rounded_rectangle (cr, 2, ds, w-4, h-(1+ds)-1, radius-1.5);
 185 //              cairo_fill (cr);
 186         } else {
 187                 if (ds < FADER_RESERVE)
 188                         ds = FADER_RESERVE;
 189
 190                 cairo_set_source (cr, pattern);
 191                 Gtkmm2ext::rounded_rectangle (cr, 1, 1, ds-1, h-2, radius-1.5);
 192                 cairo_fill (cr);
 193
 194 //              cairo_set_source (cr, shine_pattern);
 195 //              Gtkmm2ext::rounded_rectangle (cr, 2, 3, ds-1, 15, radius-1.5);
 196 //              cairo_fill (cr);
 197         }
 198
 199         /* always draw the unity-position line */
 200
 201         if (_orien == VERT) {
 202                 context->set_line_width (1);
 203                 context->set_source_rgb (0.0, 1.0, 0.0);
 204                 context->move_to (1, unity_loc);
 205                 context->line_to (girth, unity_loc);
 206                 context->stroke ();
 207         } else {
 208                 context->set_line_width (1);
 209                 context->set_source_rgb (0.0, 1.0, 0.0);
 210                 context->move_to (unity_loc, 1);
 211                 context->line_to (unity_loc, girth);
 212                 context->stroke ();
 213         }
 214
 215 //      if (Config->get_widget_prelight()) {  //pixfader does not have access to config
 216                 if (_hovering) {
 217                         Gtkmm2ext::rounded_rectangle (cr, 0, 0, get_width(), get_height(), 3);
 218                         cairo_set_source_rgba (cr, 0.905, 0.917, 0.925, 0.2);
 219                         cairo_fill (cr);
 220                 }
 221 //      }
 222
 223         last_drawn = ds;
 224
 225         return true;
 226 }
 227
 228 void
 229 PixFader::on_size_request (GtkRequisition* req)
 230 {
 231         req->width = view.width;
 232         req->height = view.height;
 233 }
 234
 235 void
 236 PixFader::on_size_allocate (Gtk::Allocation& alloc)
 237 {
 238         DrawingArea::on_size_allocate(alloc);
 239         if (_orien == VERT) {
 240                 view.height = span = alloc.get_height();
 241         } else {
 242                 view.width = span = alloc.get_width();
 243         }
 244
 245         update_unity_position ();
 246
 247         queue_draw ();
 248 }
 249
 250 bool
 251 PixFader::on_button_press_event (GdkEventButton* ev)
 252 {
 253         if (ev->type != GDK_BUTTON_PRESS) {
 254                 return true;
 255         }
 256
 257         if (ev->button != 1 && ev->button != 2) {
 258                 return false;
 259         }
 260
 261         add_modal_grab ();
 262         grab_loc = (_orien == VERT) ? ev->y : ev->x;
 263         grab_start = (_orien == VERT) ? ev->y : ev->x;
 264         grab_window = ev->window;
 265         dragging = true;
 266
 267         if (ev->button == 2) {
 268                 set_adjustment_from_event (ev);
 269         }
 270
 271         return true;
 272 }
 273
 274 bool
 275 PixFader::on_button_release_event (GdkEventButton* ev)
 276 {
 277         double const ev_pos = (_orien == VERT) ? ev->y : ev->x;
 278
 279         switch (ev->button) {
 280         case 1:
 281                 if (dragging) {
 282                         remove_modal_grab();
 283                         dragging = false;
 284
 285                         if (ev_pos == grab_start) {
 286
 287                                 /* no motion - just a click */
 288
 289                                 if (ev->state & Keyboard::TertiaryModifier) {
 290                                         adjustment.set_value (default_value);
 291                                 } else if (ev->state & Keyboard::GainFineScaleModifier) {
 292                                         adjustment.set_value (adjustment.get_lower());
 293                                 } else if ((_orien == VERT && ev_pos < span - display_span()) || (_orien == HORIZ && ev_pos > span - display_span())) {
 294                                         /* above the current display height, remember X Window coords */
 295                                         adjustment.set_value (adjustment.get_value() + adjustment.get_step_increment());
 296                                 } else {
 297                                         adjustment.set_value (adjustment.get_value() - adjustment.get_step_increment());
 298                                 }
 299                         }
 300
 301                 }
 302                 break;
 303
 304         case 2:
 305                 if (dragging) {
 306                         remove_modal_grab();
 307                         dragging = false;
 308                         set_adjustment_from_event (ev);
 309                 }
 310                 break;
 311
 312         default:
 313                 break;
 314         }
 315
 316         return false;
 317 }
 318
 319 bool
 320 PixFader::on_scroll_event (GdkEventScroll* ev)
 321 {
 322         double scale;
 323         bool ret = false;
 324
 325         if (ev->state & Keyboard::GainFineScaleModifier) {
 326                 if (ev->state & Keyboard::GainExtraFineScaleModifier) {
 327                         scale = 0.01;
 328                 } else {
 329                         scale = 0.05;
 330                 }
 331         } else {
 332                 scale = 0.25;
 333         }
 334
 335         if (_orien == VERT) {
 336
 337                 /* should left/right scroll affect vertical faders ? */
 338
 339                 switch (ev->direction) {
 340
 341                 case GDK_SCROLL_UP:
 342                         adjustment.set_value (adjustment.get_value() + (adjustment.get_page_increment() * scale));
 343                         ret = true;
 344                         break;
 345                 case GDK_SCROLL_DOWN:
 346                         adjustment.set_value (adjustment.get_value() - (adjustment.get_page_increment() * scale));
 347                         ret = true;
 348                         break;
 349                 default:
 350                         break;
 351                 }
 352         } else {
 353
 354                 /* up/down scrolls should definitely affect horizontal faders
 355                    because they are so much easier to use
 356                 */
 357
 358                 switch (ev->direction) {
 359
 360                 case GDK_SCROLL_RIGHT:
 361                 case GDK_SCROLL_UP:
 362                         adjustment.set_value (adjustment.get_value() + (adjustment.get_page_increment() * scale));
 363                         ret = true;
 364                         break;
 365                 case GDK_SCROLL_LEFT:
 366                 case GDK_SCROLL_DOWN:
 367                         adjustment.set_value (adjustment.get_value() - (adjustment.get_page_increment() * scale));
 368                         ret = true;
 369                         break;
 370                 default:
 371                         break;
 372                 }
 373         }
 374         return ret;
 375 }
 376
 377 bool
 378 PixFader::on_motion_notify_event (GdkEventMotion* ev)
 379 {
 380         if (dragging) {
 381                 double scale = 1.0;
 382                 double const ev_pos = (_orien == VERT) ? ev->y : ev->x;
 383
 384                 if (ev->window != grab_window) {
 385                         grab_loc = ev_pos;
 386                         grab_window = ev->window;
 387                         return true;
 388                 }
 389
 390                 if (ev->state & Keyboard::GainFineScaleModifier) {
 391                         if (ev->state & Keyboard::GainExtraFineScaleModifier) {
 392                                 scale = 0.05;
 393                         } else {
 394                                 scale = 0.1;
 395                         }
 396                 }
 397
 398                 double const delta = ev_pos - grab_loc;
 399                 grab_loc = ev_pos;
 400
 401                 double fract = (delta / span);
 402
 403                 fract = min (1.0, fract);
 404                 fract = max (-1.0, fract);
 405
 406                 // X Window is top->bottom for 0..Y
 407
 408                 if (_orien == VERT) {
 409                         fract = -fract;
 410                 }
 411
 412                 adjustment.set_value (adjustment.get_value() + scale * fract * (adjustment.get_upper() - adjustment.get_lower()));
 413         }
 414
 415         return true;
 416 }
 417
 418 void
 419 PixFader::adjustment_changed ()
 420 {
 421         if (display_span() != last_drawn) {
 422                 queue_draw ();
 423         }
 424 }
 425
 426 /** @return pixel offset of the current value from the right or bottom of the fader */
 427 int
 428 PixFader::display_span ()
 429 {
 430         float fract = (adjustment.get_value () - adjustment.get_lower()) / ((adjustment.get_upper() - adjustment.get_lower()));
 431         int ds;
 432         if (_orien == VERT) {
 433                 ds = (int)floor ( span * (1.0 - fract));
 434         } else {
 435                 ds = (int)floor (span * fract);
 436         }
 437
 438         return ds;
 439 }
 440
 441 void
 442 PixFader::set_fader_length (int l)
 443 {
 444         if (_orien == VERT) {
 445                 view.height = span = l;
 446         } else {
 447                 view.width = span = l;
 448         }
 449
 450         update_unity_position ();
 451
 452         queue_draw ();
 453 }
 454
 455 void
 456 PixFader::update_unity_position ()
 457 {
 458         if (_orien == VERT) {
 459                 unity_loc = (int) rint (view.height * (1 - (default_value / (adjustment.get_upper() - adjustment.get_lower())))) - 1;
 460         } else {
 461                 unity_loc = (int) rint (default_value * view.width);
 462         }
 463
 464         queue_draw ();
 465 }
 466
 467 bool
 468 PixFader::on_enter_notify_event (GdkEventCrossing*)
 469 {
 470         _hovering = true;
 471         Keyboard::magic_widget_grab_focus ();
 472         queue_draw ();
 473         return false;
 474 }
 475
 476 bool
 477 PixFader::on_leave_notify_event (GdkEventCrossing*)
 478 {
 479         _hovering = false;
 480         Keyboard::magic_widget_drop_focus();
 481         queue_draw ();
 482         return false;
 483 }
 484
 485 void
 486 PixFader::set_adjustment_from_event (GdkEventButton* ev)
 487 {
 488         double fract = (_orien == VERT) ? (1.0 - (ev->y / span)) : (ev->x / span);
 489
 490         fract = min (1.0, fract);
 491         fract = max (0.0, fract);
 492
 493         adjustment.set_value (fract * (adjustment.get_upper () - adjustment.get_lower ()));
 494 }
 495
 496 void
 497 PixFader::set_default_value (float d)
 498 {
 499         default_value = d;
 500         update_unity_position ();
 501 }