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
  24 #include "gtkmm2ext/pixfader.h"
  25 #include "gtkmm2ext/keyboard.h"
  26 #include "gtkmm2ext/rgb_macros.h"
  27 #include "gtkmm2ext/utils.h"
  28
  29 using namespace Gtkmm2ext;
  30 using namespace Gtk;
  31 using namespace std;
  32
  33 #define CORNER_RADIUS 4
  34 #define FADER_RESERVE (2*CORNER_RADIUS)
  35
  36 PixFader::PixFader (Gtk::Adjustment& adj, int orientation, int fader_length, int fader_girth)
  37         : adjustment (adj)
  38         , span (fader_length)
  39         , girth (fader_girth)
  40         , _orien (orientation)
  41         , pattern (0)
  42         , texture_pattern (0)
  43         , _hovering (false)
  44         , last_drawn (-1)
  45         , dragging (false)
  46 {
  47         default_value = adjustment.get_value();
  48         update_unity_position ();
  49
  50         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);
  51
  52         adjustment.signal_value_changed().connect (mem_fun (*this, &PixFader::adjustment_changed));
  53         adjustment.signal_changed().connect (mem_fun (*this, &PixFader::adjustment_changed));
  54 }
  55
  56 PixFader::~PixFader ()
  57 {
  58         free_patterns ();
  59 }
  60
  61 void
  62 PixFader::free_patterns ()
  63 {
  64         if (pattern) {
  65                 cairo_pattern_destroy (pattern);
  66                 pattern = 0;
  67         }
  68         if (texture_pattern) {
  69                 cairo_pattern_destroy (texture_pattern);
  70                 texture_pattern = 0;
  71         }
  72 }
  73
  74 void
  75 PixFader::create_patterns ()
  76 {
  77         free_patterns ();
  78
  79         Gdk::Color c = get_style()->get_fg (get_state());
  80         float fr, fg, fb;
  81         float br, bg, bb;
  82
  83         fr = c.get_red_p ();
  84         fg = c.get_green_p ();
  85         fb = c.get_blue_p ();
  86
  87         c = get_style()->get_bg (get_state());
  88
  89         br = c.get_red_p ();
  90         bg = c.get_green_p ();
  91         bb = c.get_blue_p ();
  92
  93         cairo_surface_t* surface;
  94         cairo_t* tc = 0;
  95         float radius = CORNER_RADIUS;
  96
  97         double w = get_width();
  98
  99         if (_orien == VERT) {
 100
 101                 surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32, get_width(), get_height() * 2.0);
 102                 tc = cairo_create (surface);
 103
 104                 /* paint background + border */
 105
 106                 cairo_pattern_t* shade_pattern = cairo_pattern_create_linear (0.0, 0.0, get_width(), 0);
 107                 cairo_pattern_add_color_stop_rgba (shade_pattern, 0, br*0.8,bg*0.8,bb*0.8, 1.0);
 108                 cairo_pattern_add_color_stop_rgba (shade_pattern, 1, br*0.6,bg*0.6,bb*0.6, 1.0);
 109                 cairo_set_source (tc, shade_pattern);
 110                 cairo_rectangle (tc, 0, 0, get_width(), get_height() * 2.0);
 111                 cairo_fill (tc);
 112
 113                 cairo_pattern_destroy (shade_pattern);
 114
 115                 /* paint lower shade */
 116
 117                 w -= 2.0;
 118
 119                 shade_pattern = cairo_pattern_create_linear (0.0, 0.0, w, 0);
 120                 cairo_pattern_add_color_stop_rgba (shade_pattern, 0, fr*0.8,fg*0.8,fb*0.8, 1.0);
 121                 cairo_pattern_add_color_stop_rgba (shade_pattern, 1, fr*0.6,fg*0.6,fb*0.6, 1.0);
 122                 cairo_set_source (tc, shade_pattern);
 123                 Gtkmm2ext::rounded_top_half_rectangle (tc, 1.0, get_height(), w, get_height(), radius-1.5);
 124                 cairo_fill (tc);
 125
 126                 cairo_pattern_destroy (shade_pattern);
 127
 128                 pattern = cairo_pattern_create_for_surface (surface);
 129
 130         } else {
 131
 132                 surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32, get_width() * 2.0, get_height());
 133                 tc = cairo_create (surface);
 134
 135                 /* paint right shade (background section)*/
 136
 137                 cairo_pattern_t* shade_pattern = cairo_pattern_create_linear (0.0, 0.0, 0.0, get_height());
 138                 cairo_pattern_add_color_stop_rgba (shade_pattern, 0, br*0.8,bg*0.8,bb*0.8, 1.0);
 139                 cairo_pattern_add_color_stop_rgba (shade_pattern, 1, br*0.6,bg*0.6,bb*0.6, 1.0);
 140                 cairo_set_source (tc, shade_pattern);
 141                 cairo_rectangle (tc, 0, 0, get_width() * 2.0, get_height());
 142                 cairo_fill (tc);
 143
 144                 /* paint left shade (active section/foreground) */
 145
 146                 shade_pattern = cairo_pattern_create_linear (0.0, 0.0, 0.0, get_height());
 147                 cairo_pattern_add_color_stop_rgba (shade_pattern, 0, fr*0.8,fg*0.8,fb*0.8, 1.0);
 148                 cairo_pattern_add_color_stop_rgba (shade_pattern, 1, fr*0.6,fg*0.6,fb*0.6, 1.0);
 149                 cairo_set_source (tc, shade_pattern);
 150                 Gtkmm2ext::rounded_right_half_rectangle (tc, 0, 1, get_width(), get_height() - 2.0, radius-1.5);
 151                 cairo_fill (tc);
 152                 cairo_pattern_destroy (shade_pattern);
 153
 154                 pattern = cairo_pattern_create_for_surface (surface);
 155         }
 156
 157         cairo_destroy (tc);
 158         cairo_surface_destroy (surface);
 159
 160         if ( !_text.empty()) {
 161                 _layout->get_pixel_size (_text_width, _text_height);
 162         } else {
 163                 _text_width = 0;
 164                 _text_height = 0;
 165         }
 166
 167         c = get_style()->get_text (get_state());
 168
 169         text_r = c.get_red_p ();
 170         text_g = c.get_green_p ();
 171         text_b = c.get_blue_p ();
 172 }
 173
 174 bool
 175 PixFader::on_expose_event (GdkEventExpose* ev)
 176 {
 177         Cairo::RefPtr<Cairo::Context> context = get_window()->create_cairo_context();
 178         cairo_t* cr = context->cobj();
 179
 180         cairo_rectangle (cr, ev->area.x, ev->area.y, ev->area.width, ev->area.height);
 181         cairo_clip (cr);
 182
 183         if (!pattern) {
 184                 create_patterns();
 185         }
 186
 187         int ds = display_span ();
 188         float w = get_width();
 189         float h = get_height();
 190
 191         cairo_matrix_t matrix;
 192
 193         if (_orien == VERT) {
 194
 195                 if (ds > h - FADER_RESERVE) {
 196                         ds = h - FADER_RESERVE;
 197                 }
 198
 199                 cairo_set_source (cr, pattern);
 200                 cairo_matrix_init_translate (&matrix, 0, (h - ds));
 201                 cairo_pattern_set_matrix (pattern, &matrix);
 202                 Gtkmm2ext::rounded_rectangle (cr, 0, 0, w, h, CORNER_RADIUS-1.5);
 203                 cairo_fill (cr);
 204
 205         } else {
 206
 207                 if (ds < FADER_RESERVE) {
 208                         ds = FADER_RESERVE;
 209                 }
 210
 211                 /*
 212                   if ds == w, the pattern does not need to be translated
 213                   if ds == 0 (or FADER_RESERVE), the pattern needs to be moved
 214                       w to the left, which is -w in pattern space, and w in
 215                       user space
 216                   if ds == 10, then the pattern needs to be moved w - 10
 217                       to the left, which is -(w-10) in pattern space, which
 218                       is (w - 10) in user space
 219
 220                   thus: translation = (w - ds)
 221                  */
 222
 223                 cairo_set_source (cr, pattern);
 224                 cairo_matrix_init_translate (&matrix, w - ds, 0);
 225                 cairo_pattern_set_matrix (pattern, &matrix);
 226                 Gtkmm2ext::rounded_rectangle (cr, 0, 0, w, h, CORNER_RADIUS-1.5);
 227                 cairo_fill (cr);
 228         }
 229
 230         /* draw the unity-position line if it's not at either end*/
 231         if (unity_loc > 0) {
 232                 if ( _orien == VERT) {
 233                         if (unity_loc < h ) {
 234                                         context->set_line_width (1);
 235                                         context->set_source_rgb (0.0, 1.0, 0.0);
 236                                         context->move_to (1, unity_loc);
 237                                         context->line_to (girth - 2.0, unity_loc);
 238                                         context->stroke ();
 239                         }
 240                 } else {
 241                         if ( unity_loc < w ){
 242                                 context->set_line_width (1);
 243                                 context->set_source_rgb (0.0, 1.0, 0.0);
 244                                 context->move_to (unity_loc, 1);
 245                                 context->line_to (unity_loc, girth - 2.0);
 246                                 context->stroke ();
 247                         }
 248                 }
 249         }
 250
 251         if ( !_text.empty() ) {
 252
 253                 cairo_new_path (cr);
 254
 255                 /* center text */
 256                 cairo_move_to (cr, (get_width() - _text_width)/2.0, get_height()/2.0 - _text_height/2.0);
 257
 258                 cairo_set_source_rgba (cr, text_r, text_g, text_b, 0.9);
 259                 pango_cairo_show_layout (cr, _layout->gobj());
 260         }
 261
 262 //      if (Config->get_widget_prelight()) {  //pixfader does not have access to config
 263                 if (_hovering) {
 264                         Gtkmm2ext::rounded_rectangle (cr, 0, 0, get_width(), get_height(), 3);
 265                         cairo_set_source_rgba (cr, 0.905, 0.917, 0.925, 0.1);
 266                         cairo_fill (cr);
 267                 }
 268 //      }
 269
 270         last_drawn = ds;
 271
 272         return true;
 273 }
 274
 275 void
 276 PixFader::on_size_request (GtkRequisition* req)
 277 {
 278         if (_orien == VERT) {
 279                 req->width = girth;
 280                 req->height = span;
 281         } else {
 282                 req->height = girth;
 283                 req->width = span;
 284         }
 285 }
 286
 287 void
 288 PixFader::on_size_allocate (Gtk::Allocation& alloc)
 289 {
 290         DrawingArea::on_size_allocate(alloc);
 291
 292         if (_orien == VERT) {
 293                 girth = alloc.get_width ();
 294         } else {
 295                 girth = alloc.get_height ();
 296         }
 297
 298         update_unity_position ();
 299
 300         if (is_realized()) {
 301                 create_patterns();
 302                 queue_draw ();
 303         }
 304 }
 305
 306 bool
 307 PixFader::on_button_press_event (GdkEventButton* ev)
 308 {
 309         if (ev->type != GDK_BUTTON_PRESS) {
 310                 return true;
 311         }
 312
 313         if (ev->button != 1 && ev->button != 2) {
 314                 return false;
 315         }
 316
 317         add_modal_grab ();
 318         grab_loc = (_orien == VERT) ? ev->y : ev->x;
 319         grab_start = (_orien == VERT) ? ev->y : ev->x;
 320         grab_window = ev->window;
 321         dragging = true;
 322         gdk_pointer_grab(ev->window,false,
 323                         GdkEventMask( Gdk::POINTER_MOTION_MASK | Gdk::BUTTON_PRESS_MASK |Gdk::BUTTON_RELEASE_MASK),
 324                         NULL,NULL,ev->time);
 325
 326         if (ev->button == 2) {
 327                 set_adjustment_from_event (ev);
 328         }
 329
 330         return true;
 331 }
 332
 333 bool
 334 PixFader::on_button_release_event (GdkEventButton* ev)
 335 {
 336         double const ev_pos = (_orien == VERT) ? ev->y : ev->x;
 337
 338         switch (ev->button) {
 339         case 1:
 340                 if (dragging) {
 341                         remove_modal_grab();
 342                         dragging = false;
 343                         gdk_pointer_ungrab (GDK_CURRENT_TIME);
 344
 345                         if (!_hovering) {
 346                                 Keyboard::magic_widget_drop_focus();
 347                                 queue_draw ();
 348                         }
 349
 350                         if (ev_pos == grab_start) {
 351
 352                                 /* no motion - just a click */
 353
 354                                 if (ev->state & Keyboard::TertiaryModifier) {
 355                                         adjustment.set_value (default_value);
 356                                 } else if (ev->state & Keyboard::GainFineScaleModifier) {
 357                                         adjustment.set_value (adjustment.get_lower());
 358                                 } else if ((_orien == VERT && ev_pos < display_span()) || (_orien == HORIZ && ev_pos > display_span())) {
 359                                         /* above the current display height, remember X Window coords */
 360                                         adjustment.set_value (adjustment.get_value() + adjustment.get_step_increment());
 361                                 } else {
 362                                         adjustment.set_value (adjustment.get_value() - adjustment.get_step_increment());
 363                                 }
 364                         }
 365                         return true;
 366                 }
 367                 break;
 368
 369         case 2:
 370                 if (dragging) {
 371                         remove_modal_grab();
 372                         dragging = false;
 373                         set_adjustment_from_event (ev);
 374                         gdk_pointer_ungrab (GDK_CURRENT_TIME);
 375                         return true;
 376                 }
 377                 break;
 378
 379         default:
 380                 break;
 381         }
 382
 383         return false;
 384 }
 385
 386 bool
 387 PixFader::on_scroll_event (GdkEventScroll* ev)
 388 {
 389         double scale;
 390         bool ret = false;
 391
 392         if (ev->state & Keyboard::GainFineScaleModifier) {
 393                 if (ev->state & Keyboard::GainExtraFineScaleModifier) {
 394                         scale = 0.01;
 395                 } else {
 396                         scale = 0.05;
 397                 }
 398         } else {
 399                 scale = 0.25;
 400         }
 401
 402         if (_orien == VERT) {
 403
 404                 /* should left/right scroll affect vertical faders ? */
 405
 406                 switch (ev->direction) {
 407
 408                 case GDK_SCROLL_UP:
 409                         adjustment.set_value (adjustment.get_value() + (adjustment.get_page_increment() * scale));
 410                         ret = true;
 411                         break;
 412                 case GDK_SCROLL_DOWN:
 413                         adjustment.set_value (adjustment.get_value() - (adjustment.get_page_increment() * scale));
 414                         ret = true;
 415                         break;
 416                 default:
 417                         break;
 418                 }
 419         } else {
 420
 421                 /* up/down scrolls should definitely affect horizontal faders
 422                    because they are so much easier to use
 423                 */
 424
 425                 switch (ev->direction) {
 426
 427                 case GDK_SCROLL_RIGHT:
 428                 case GDK_SCROLL_UP:
 429                         adjustment.set_value (adjustment.get_value() + (adjustment.get_page_increment() * scale));
 430                         ret = true;
 431                         break;
 432                 case GDK_SCROLL_LEFT:
 433                 case GDK_SCROLL_DOWN:
 434                         adjustment.set_value (adjustment.get_value() - (adjustment.get_page_increment() * scale));
 435                         ret = true;
 436                         break;
 437                 default:
 438                         break;
 439                 }
 440         }
 441         return ret;
 442 }
 443
 444 bool
 445 PixFader::on_motion_notify_event (GdkEventMotion* ev)
 446 {
 447         if (dragging) {
 448                 double scale = 1.0;
 449                 double const ev_pos = (_orien == VERT) ? ev->y : ev->x;
 450
 451                 if (ev->window != grab_window) {
 452                         grab_loc = ev_pos;
 453                         grab_window = ev->window;
 454                         return true;
 455                 }
 456
 457                 if (ev->state & Keyboard::GainFineScaleModifier) {
 458                         if (ev->state & Keyboard::GainExtraFineScaleModifier) {
 459                                 scale = 0.05;
 460                         } else {
 461                                 scale = 0.1;
 462                         }
 463                 }
 464
 465                 double const delta = ev_pos - grab_loc;
 466                 grab_loc = ev_pos;
 467
 468                 double fract = (delta / span);
 469
 470                 fract = min (1.0, fract);
 471                 fract = max (-1.0, fract);
 472
 473                 // X Window is top->bottom for 0..Y
 474
 475                 if (_orien == VERT) {
 476                         fract = -fract;
 477                 }
 478
 479                 adjustment.set_value (adjustment.get_value() + scale * fract * (adjustment.get_upper() - adjustment.get_lower()));
 480         }
 481
 482         return true;
 483 }
 484
 485 void
 486 PixFader::adjustment_changed ()
 487 {
 488         if (display_span() != last_drawn) {
 489                 queue_draw ();
 490         }
 491 }
 492
 493 /** @return pixel offset of the current value from the right or bottom of the fader */
 494 int
 495 PixFader::display_span ()
 496 {
 497         float fract = (adjustment.get_value () - adjustment.get_lower()) / ((adjustment.get_upper() - adjustment.get_lower()));
 498         int ds;
 499         if (_orien == VERT) {
 500                 ds = (int)floor ( span * (1.0 - fract));
 501         } else {
 502                 ds = (int)floor (span * fract);
 503         }
 504
 505         return ds;
 506 }
 507
 508 void
 509 PixFader::set_fader_length (int l)
 510 {
 511         span = l;
 512         update_unity_position ();
 513         queue_resize ();
 514 }
 515
 516 void
 517 PixFader::update_unity_position ()
 518 {
 519         if (_orien == VERT) {
 520                 unity_loc = (int) rint (span * (1 - (default_value / (adjustment.get_upper() - adjustment.get_lower())))) - 1;
 521         } else {
 522                 unity_loc = (int) rint (default_value * span / (adjustment.get_upper() - adjustment.get_lower()));
 523         }
 524
 525         queue_draw ();
 526 }
 527
 528 bool
 529 PixFader::on_enter_notify_event (GdkEventCrossing*)
 530 {
 531         _hovering = true;
 532         Keyboard::magic_widget_grab_focus ();
 533         queue_draw ();
 534         return false;
 535 }
 536
 537 bool
 538 PixFader::on_leave_notify_event (GdkEventCrossing*)
 539 {
 540         if (!dragging) {
 541                 _hovering = false;
 542                 Keyboard::magic_widget_drop_focus();
 543                 queue_draw ();
 544         }
 545         return false;
 546 }
 547
 548 void
 549 PixFader::set_adjustment_from_event (GdkEventButton* ev)
 550 {
 551         double fract = (_orien == VERT) ? (1.0 - (ev->y / span)) : (ev->x / span);
 552
 553         fract = min (1.0, fract);
 554         fract = max (0.0, fract);
 555
 556         adjustment.set_value (fract * (adjustment.get_upper () - adjustment.get_lower ()));
 557 }
 558
 559 void
 560 PixFader::set_default_value (float d)
 561 {
 562         default_value = d;
 563         update_unity_position ();
 564 }
 565
 566 void
 567 PixFader::set_text (const std::string& str)
 568 {
 569         _text = str;
 570
 571         if (!_layout && !_text.empty()) {
 572                 _layout = Pango::Layout::create (get_pango_context());
 573         }
 574
 575         if (_layout) {
 576                 _layout->set_text (str);
 577         }
 578
 579         queue_resize ();
 580 }
 581
 582 void
 583 PixFader::on_state_changed (Gtk::StateType old_state)
 584 {
 585         Widget::on_state_changed (old_state);
 586         create_patterns ();
 587 }