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 #if 0
  46         pixbuf[NORMAL] = belt;
  47         pixbuf[DESENSITISED] = belt_desensitised;
  48 #endif
  49
  50         pattern = 0;
  51         shine_pattern = 0;
  52
  53         _hovering = false;
  54         dragging = false;
  55         default_value = adjustment.get_value();
  56         last_drawn = -1;
  57
  58         view.x = 0;
  59         view.y = 0;
  60
  61         if (orientation == VERT) {
  62                 view.width = girth = 24;
  63         } else {
  64                 view.height = girth = 24;
  65         }
  66
  67         set_fader_length (fader_length);
  68
  69         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);
  70
  71         adjustment.signal_value_changed().connect (mem_fun (*this, &PixFader::adjustment_changed));
  72         adjustment.signal_changed().connect (mem_fun (*this, &PixFader::adjustment_changed));
  73
  74 #if 0
  75         for (int i = 0; i < STATES; ++i) {
  76                 Cairo::Format format;
  77
  78                 if (pixbuf[i]->get_has_alpha()) {
  79                         format = Cairo::FORMAT_ARGB32;
  80                 } else {
  81                         format = Cairo::FORMAT_RGB24;
  82                 }
  83
  84                 belt_surface[i] = Cairo::ImageSurface::create (format, pixbuf[i]->get_width(), pixbuf[i]->get_height());
  85                 belt_context[i] = Cairo::Context::create (belt_surface[i]);
  86                 Gdk::Cairo::set_source_pixbuf (belt_context[i], pixbuf[i], 0.0, 0.0);
  87                 belt_context[i]->paint();
  88         }
  89 #endif
  90
  91         left_r = 0;
  92         left_g = 0;
  93         left_b = 0;
  94
  95         right_r = 0;
  96         right_g = 0;
  97         right_b = 0;
  98 }
  99
 100 PixFader::~PixFader ()
 101 {
 102 }
 103
 104 void
 105 PixFader::set_border_colors (uint32_t left, uint32_t right)
 106 {
 107         int r, g, b;
 108         UINT_TO_RGB(left, &r, &g, &b);
 109         left_r = r/255.0;
 110         left_g = g/255.0;
 111         left_b = b/255.0;
 112         UINT_TO_RGB(right, &r, &g, &b);
 113         right_r = r/255.0;
 114         right_g = g/255.0;
 115         right_b = b/255.0;
 116 }
 117
 118 void
 119 PixFader::create_patterns ()
 120 {
 121         Gdk::Color c = get_style()->get_fg (get_state());
 122     float r, g, b;
 123         r = c.get_red_p ();
 124         g = c.get_green_p ();
 125         b = c.get_blue_p ();
 126
 127         if (_orien == VERT) {
 128                 pattern = cairo_pattern_create_linear (0.0, 0.0, get_width(), 0);
 129                 cairo_pattern_add_color_stop_rgba (pattern, 0, r*0.8,g*0.8,b*0.8, 1.0);
 130                 cairo_pattern_add_color_stop_rgba (pattern, 1, r*0.6,g*0.6,b*0.6, 1.0);
 131
 132                 shine_pattern = cairo_pattern_create_linear (0.0, 0.0, 15, 0);
 133                 cairo_pattern_add_color_stop_rgba (shine_pattern, 0, 1,1,1,0.0);
 134                 cairo_pattern_add_color_stop_rgba (shine_pattern, 0.2, 1,1,1,0.3);
 135                 cairo_pattern_add_color_stop_rgba (shine_pattern, 0.5, 1,1,1,0.0);
 136                 cairo_pattern_add_color_stop_rgba (shine_pattern, 1, 1,1,1,0.0);
 137         } else {
 138                 float rheight = get_height();
 139
 140                 pattern = cairo_pattern_create_linear (0.0, 0.0, 0.0, rheight);
 141                 cairo_pattern_add_color_stop_rgba (pattern, 0, r*0.8,g*0.8,b*0.8, 1.0);
 142                 cairo_pattern_add_color_stop_rgba (pattern, 1, r*0.6,g*0.6,b*0.6, 1.0);
 143
 144                 shine_pattern = cairo_pattern_create_linear (0.0, 0.0, 0.0, rheight);
 145                 cairo_pattern_add_color_stop_rgba (shine_pattern, 0, 1,1,1,0.0);
 146                 cairo_pattern_add_color_stop_rgba (shine_pattern, 0.2, 1,1,1,0.3);
 147                 cairo_pattern_add_color_stop_rgba (shine_pattern, 0.5, 1,1,1,0.0);
 148                 cairo_pattern_add_color_stop_rgba (shine_pattern, 1, 1,1,1,0.0);
 149         }
 150
 151         if ( !_text.empty()) {
 152                 _layout->get_pixel_size (_text_width, _text_height);
 153         } else {
 154                 _text_width = 0;
 155                 _text_height = 0;
 156         }
 157         c = get_style()->get_text (get_state());
 158         text_r = c.get_red_p ();
 159         text_g = c.get_green_p ();
 160         text_b = c.get_blue_p ();
 161 }
 162
 163 bool
 164 PixFader::on_expose_event (GdkEventExpose* ev)
 165 {
 166         Cairo::RefPtr<Cairo::Context> context = get_window()->create_cairo_context();
 167         cairo_t* cr = context->cobj();
 168
 169         if (!pattern) {
 170                 create_patterns();
 171         }
 172
 173 //      int const pi = get_sensitive() ? NORMAL : DESENSITISED;
 174
 175         int ds = display_span ();
 176
 177         float w = get_width();
 178         float h = get_height();
 179         float radius = CORNER_RADIUS;
 180
 181         /* black border */
 182
 183         cairo_set_source_rgb (cr, 0,0,0);
 184         cairo_rectangle (cr, 0, 0, w, h);
 185         cairo_fill (cr);
 186
 187         /* draw active box */
 188
 189         if (_orien == VERT) {
 190                 if (ds > h - FADER_RESERVE)
 191                         ds = h - FADER_RESERVE;
 192
 193                 cairo_set_source (cr, pattern);
 194                 Gtkmm2ext::rounded_rectangle (cr, 1, 1+ds, w-2, h-(1+ds)-1, radius-1.5);
 195                 cairo_fill (cr);
 196
 197 //              cairo_set_source (cr, shine_pattern);
 198 //              Gtkmm2ext::rounded_rectangle (cr, 2, ds, w-4, h-(1+ds)-1, radius-1.5);
 199 //              cairo_fill (cr);
 200         } else {
 201                 if (ds < FADER_RESERVE)
 202                         ds = FADER_RESERVE;
 203
 204                 cairo_set_source (cr, pattern);
 205                 Gtkmm2ext::rounded_rectangle (cr, 1, 1, ds-1, h-2, radius-1.5);
 206                 cairo_fill (cr);
 207
 208 //              cairo_set_source (cr, shine_pattern);
 209 //              Gtkmm2ext::rounded_rectangle (cr, 2, 3, ds-1, 15, radius-1.5);
 210 //              cairo_fill (cr);
 211         }
 212
 213         /* draw the unity-position line if it's not at either end*/
 214         if (unity_loc > 0) {
 215                 if ( _orien == VERT && unity_loc < h ) {
 216                                         context->set_line_width (1);
 217                                         context->set_source_rgb (0.0, 1.0, 0.0);
 218                                         context->move_to (1, unity_loc);
 219                                         context->line_to (girth, unity_loc);
 220                                         context->stroke ();
 221                 } else if ( unity_loc < w ){
 222                                         context->set_line_width (1);
 223                                         context->set_source_rgb (0.0, 1.0, 0.0);
 224                                         context->move_to (unity_loc, 1);
 225                                         context->line_to (unity_loc, girth);
 226                                         context->stroke ();
 227                 }
 228         }
 229
 230         if ( !_text.empty() ) {
 231
 232                 cairo_new_path (cr);
 233
 234                 /* center text */
 235                 cairo_move_to (cr, (get_width() - _text_width)/2.0, get_height()/2.0 - _text_height/2.0);
 236
 237                 cairo_set_source_rgba (cr, text_r, text_g, text_b, 0.9);
 238                 pango_cairo_show_layout (cr, _layout->gobj());
 239         }
 240
 241 //      if (Config->get_widget_prelight()) {  //pixfader does not have access to config
 242                 if (_hovering) {
 243                         Gtkmm2ext::rounded_rectangle (cr, 0, 0, get_width(), get_height(), 3);
 244                         cairo_set_source_rgba (cr, 0.905, 0.917, 0.925, 0.2);
 245                         cairo_fill (cr);
 246                 }
 247 //      }
 248
 249         last_drawn = ds;
 250
 251         return true;
 252 }
 253
 254 void
 255 PixFader::on_size_request (GtkRequisition* req)
 256 {
 257         req->width = view.width;
 258         req->height = view.height;
 259 }
 260
 261 void
 262 PixFader::on_size_allocate (Gtk::Allocation& alloc)
 263 {
 264         DrawingArea::on_size_allocate(alloc);
 265         if (_orien == VERT) {
 266                 view.height = span = alloc.get_height();
 267         } else {
 268                 view.width = span = alloc.get_width();
 269         }
 270
 271         update_unity_position ();
 272         create_patterns();
 273
 274         queue_draw ();
 275 }
 276
 277 bool
 278 PixFader::on_button_press_event (GdkEventButton* ev)
 279 {
 280         if (ev->type != GDK_BUTTON_PRESS) {
 281                 return true;
 282         }
 283
 284         if (ev->button != 1 && ev->button != 2) {
 285                 return false;
 286         }
 287
 288         add_modal_grab ();
 289         grab_loc = (_orien == VERT) ? ev->y : ev->x;
 290         grab_start = (_orien == VERT) ? ev->y : ev->x;
 291         grab_window = ev->window;
 292         dragging = true;
 293         gdk_pointer_grab(ev->window,false,
 294                         GdkEventMask( Gdk::POINTER_MOTION_MASK | Gdk::BUTTON_PRESS_MASK |Gdk::BUTTON_RELEASE_MASK),
 295                         NULL,NULL,ev->time);
 296
 297         if (ev->button == 2) {
 298                 set_adjustment_from_event (ev);
 299         }
 300
 301         return true;
 302 }
 303
 304 bool
 305 PixFader::on_button_release_event (GdkEventButton* ev)
 306 {
 307         double const ev_pos = (_orien == VERT) ? ev->y : ev->x;
 308
 309         switch (ev->button) {
 310         case 1:
 311                 if (dragging) {
 312                         remove_modal_grab();
 313                         dragging = false;
 314                         gdk_pointer_ungrab (GDK_CURRENT_TIME);
 315
 316                         if (!_hovering) {
 317                                 Keyboard::magic_widget_drop_focus();
 318                                 queue_draw ();
 319                         }
 320
 321                         if (ev_pos == grab_start) {
 322
 323                                 /* no motion - just a click */
 324
 325                                 if (ev->state & Keyboard::TertiaryModifier) {
 326                                         adjustment.set_value (default_value);
 327                                 } else if (ev->state & Keyboard::GainFineScaleModifier) {
 328                                         adjustment.set_value (adjustment.get_lower());
 329                                 } else if ((_orien == VERT && ev_pos < display_span()) || (_orien == HORIZ && ev_pos > display_span())) {
 330                                         /* above the current display height, remember X Window coords */
 331                                         adjustment.set_value (adjustment.get_value() + adjustment.get_step_increment());
 332                                 } else {
 333                                         adjustment.set_value (adjustment.get_value() - adjustment.get_step_increment());
 334                                 }
 335                         }
 336
 337                 }
 338                 break;
 339
 340         case 2:
 341                 if (dragging) {
 342                         remove_modal_grab();
 343                         dragging = false;
 344                         set_adjustment_from_event (ev);
 345                         gdk_pointer_ungrab (GDK_CURRENT_TIME);
 346                 }
 347                 break;
 348
 349         default:
 350                 break;
 351         }
 352
 353         return false;
 354 }
 355
 356 bool
 357 PixFader::on_scroll_event (GdkEventScroll* ev)
 358 {
 359         double scale;
 360         bool ret = false;
 361
 362         if (ev->state & Keyboard::GainFineScaleModifier) {
 363                 if (ev->state & Keyboard::GainExtraFineScaleModifier) {
 364                         scale = 0.01;
 365                 } else {
 366                         scale = 0.05;
 367                 }
 368         } else {
 369                 scale = 0.25;
 370         }
 371
 372         if (_orien == VERT) {
 373
 374                 /* should left/right scroll affect vertical faders ? */
 375
 376                 switch (ev->direction) {
 377
 378                 case GDK_SCROLL_UP:
 379                         adjustment.set_value (adjustment.get_value() + (adjustment.get_page_increment() * scale));
 380                         ret = true;
 381                         break;
 382                 case GDK_SCROLL_DOWN:
 383                         adjustment.set_value (adjustment.get_value() - (adjustment.get_page_increment() * scale));
 384                         ret = true;
 385                         break;
 386                 default:
 387                         break;
 388                 }
 389         } else {
 390
 391                 /* up/down scrolls should definitely affect horizontal faders
 392                    because they are so much easier to use
 393                 */
 394
 395                 switch (ev->direction) {
 396
 397                 case GDK_SCROLL_RIGHT:
 398                 case GDK_SCROLL_UP:
 399                         adjustment.set_value (adjustment.get_value() + (adjustment.get_page_increment() * scale));
 400                         ret = true;
 401                         break;
 402                 case GDK_SCROLL_LEFT:
 403                 case GDK_SCROLL_DOWN:
 404                         adjustment.set_value (adjustment.get_value() - (adjustment.get_page_increment() * scale));
 405                         ret = true;
 406                         break;
 407                 default:
 408                         break;
 409                 }
 410         }
 411         return ret;
 412 }
 413
 414 bool
 415 PixFader::on_motion_notify_event (GdkEventMotion* ev)
 416 {
 417         if (dragging) {
 418                 double scale = 1.0;
 419                 double const ev_pos = (_orien == VERT) ? ev->y : ev->x;
 420
 421                 if (ev->window != grab_window) {
 422                         grab_loc = ev_pos;
 423                         grab_window = ev->window;
 424                         return true;
 425                 }
 426
 427                 if (ev->state & Keyboard::GainFineScaleModifier) {
 428                         if (ev->state & Keyboard::GainExtraFineScaleModifier) {
 429                                 scale = 0.05;
 430                         } else {
 431                                 scale = 0.1;
 432                         }
 433                 }
 434
 435                 double const delta = ev_pos - grab_loc;
 436                 grab_loc = ev_pos;
 437
 438                 double fract = (delta / span);
 439
 440                 fract = min (1.0, fract);
 441                 fract = max (-1.0, fract);
 442
 443                 // X Window is top->bottom for 0..Y
 444
 445                 if (_orien == VERT) {
 446                         fract = -fract;
 447                 }
 448
 449                 adjustment.set_value (adjustment.get_value() + scale * fract * (adjustment.get_upper() - adjustment.get_lower()));
 450         }
 451
 452         return true;
 453 }
 454
 455 void
 456 PixFader::adjustment_changed ()
 457 {
 458         if (display_span() != last_drawn) {
 459                 queue_draw ();
 460         }
 461 }
 462
 463 /** @return pixel offset of the current value from the right or bottom of the fader */
 464 int
 465 PixFader::display_span ()
 466 {
 467         float fract = (adjustment.get_value () - adjustment.get_lower()) / ((adjustment.get_upper() - adjustment.get_lower()));
 468         int ds;
 469         if (_orien == VERT) {
 470                 ds = (int)floor ( span * (1.0 - fract));
 471         } else {
 472                 ds = (int)floor (span * fract);
 473         }
 474
 475         return ds;
 476 }
 477
 478 void
 479 PixFader::set_fader_length (int l)
 480 {
 481         if (_orien == VERT) {
 482                 view.height = span = l;
 483         } else {
 484                 view.width = span = l;
 485         }
 486
 487         update_unity_position ();
 488
 489         queue_draw ();
 490 }
 491
 492 void
 493 PixFader::update_unity_position ()
 494 {
 495         if (_orien == VERT) {
 496                 unity_loc = (int) rint (view.height * (1 - (default_value / (adjustment.get_upper() - adjustment.get_lower())))) - 1;
 497         } else {
 498                 unity_loc = (int) rint (default_value * view.width);
 499         }
 500
 501         queue_draw ();
 502 }
 503
 504 bool
 505 PixFader::on_enter_notify_event (GdkEventCrossing*)
 506 {
 507         _hovering = true;
 508         Keyboard::magic_widget_grab_focus ();
 509         queue_draw ();
 510         return false;
 511 }
 512
 513 bool
 514 PixFader::on_leave_notify_event (GdkEventCrossing*)
 515 {
 516         if (!dragging) {
 517                 _hovering = false;
 518                 Keyboard::magic_widget_drop_focus();
 519                 queue_draw ();
 520         }
 521         return false;
 522 }
 523
 524 void
 525 PixFader::set_adjustment_from_event (GdkEventButton* ev)
 526 {
 527         double fract = (_orien == VERT) ? (1.0 - (ev->y / span)) : (ev->x / span);
 528
 529         fract = min (1.0, fract);
 530         fract = max (0.0, fract);
 531
 532         adjustment.set_value (fract * (adjustment.get_upper () - adjustment.get_lower ()));
 533 }
 534
 535 void
 536 PixFader::set_default_value (float d)
 537 {
 538         default_value = d;
 539         update_unity_position ();
 540 }
 541
 542 void
 543 PixFader::set_text (const std::string& str)
 544 {
 545         _text = str;
 546
 547         if (!_layout && !_text.empty()) {
 548                 _layout = Pango::Layout::create (get_pango_context());
 549         }
 550
 551         if (_layout) {
 552                 _layout->set_text (str);
 553         }
 554
 555         queue_resize ();
 556 }
 557