libs/widgets/scroomer.cc

   1 /*
   2     Copyright (C) 2008 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 */
  19
  20 #include <iostream>
  21
  22 #include "gtkmm2ext/keyboard.h"
  23 #include "widgets/scroomer.h"
  24
  25 using namespace std;
  26 using namespace Gdk;
  27 using namespace Gtk;
  28 using namespace ArdourWidgets;
  29
  30 Scroomer::Scroomer(Gtk::Adjustment& adjustment)
  31         : adj(adjustment)
  32         , handle_size(0)
  33         , grab_comp(None)
  34 {
  35         position[TopBase] = 0;
  36         position[Handle1] = 0;
  37         position[Slider] = 0;
  38         position[Handle2] = 0;
  39         position[BottomBase] = 0;
  40         position[Total] = 0;
  41
  42         add_events (Gdk::BUTTON_PRESS_MASK |
  43                     Gdk::BUTTON_RELEASE_MASK |
  44                     Gdk::POINTER_MOTION_MASK |
  45                     Gdk::SCROLL_MASK);
  46
  47         adjustment.signal_value_changed().connect (mem_fun (*this, &Scroomer::adjustment_changed));
  48         //adjustment.signal_changed().connect (mem_fun (*this, &Scroomer::adjustment_changed));
  49 }
  50
  51 Scroomer::~Scroomer()
  52 {
  53 }
  54
  55 bool
  56 Scroomer::on_motion_notify_event (GdkEventMotion* ev)
  57 {
  58         double range = adj.get_upper() - adj.get_lower();
  59         double pixel2val = range / get_height();
  60         double val_at_pointer = ((get_height() - ev->y) * pixel2val) + adj.get_lower();
  61         double delta_y = ev->y - grab_y;
  62         double half_min_page = min_page_size / 2;
  63         double fract = delta_y / position[Total];
  64         double scale, temp, zoom;
  65         double val, page;
  66
  67         if (grab_comp == None || grab_comp == Total) {
  68                 return true;
  69         }
  70
  71         if (ev->window != grab_window) {
  72                 grab_y = ev->y;
  73                 grab_window = ev->window;
  74                 return true;
  75         }
  76
  77         if (ev->y < 0 || ev->y > get_height ()) {
  78                 return true;
  79         }
  80
  81         grab_y = ev->y;
  82
  83         if (ev->state & Gtkmm2ext::Keyboard::PrimaryModifier) {
  84                 if (ev->state & Gtkmm2ext::Keyboard::SecondaryModifier) {
  85                         scale = 0.05;
  86                 } else {
  87                         scale = 0.1;
  88                 }
  89         } else {
  90                 scale = 1.0;
  91         }
  92
  93         fract = min (1.0, fract);
  94         fract = max (-1.0, fract);
  95         fract = -fract;
  96
  97         switch (grab_comp) {
  98         case TopBase:
  99         case BottomBase:
 100                 unzoomed_val += scale * fract * range;
 101                 unzoomed_val = min(unzoomed_val, adj.get_upper() - unzoomed_page);
 102                 unzoomed_val = max(unzoomed_val, adj.get_lower());
 103                 break;
 104         case Slider:
 105                 unzoomed_val += scale * fract * range;
 106                 unzoomed_val = min(unzoomed_val, adj.get_upper() - unzoomed_page);
 107                 unzoomed_val = max(unzoomed_val, adj.get_lower());
 108                 break;
 109         case Handle1:
 110
 111                 unzoomed_page += scale * fract * range;
 112                 unzoomed_page = min(unzoomed_page, adj.get_upper() - unzoomed_val);
 113                 unzoomed_page = max(unzoomed_page, min_page_size);
 114
 115                 if (pinch){
 116                         temp = unzoomed_val + unzoomed_page;
 117                         unzoomed_val -= scale * fract * range * 0.5;
 118                         unzoomed_val = min(unzoomed_val, temp - min_page_size);
 119                         unzoomed_val = max(unzoomed_val, adj.get_lower());
 120                 }
 121
 122                 break;
 123         case Handle2:
 124                 temp = unzoomed_val + unzoomed_page;
 125                 unzoomed_val += scale * fract * range;
 126                 unzoomed_val = min(unzoomed_val, temp - min_page_size);
 127                 unzoomed_val = max(unzoomed_val, adj.get_lower());
 128
 129                 unzoomed_page = temp - unzoomed_val;
 130
 131                 if (pinch){
 132
 133                         unzoomed_page -= scale * fract * range;
 134                 }
 135
 136                 unzoomed_page = min(unzoomed_page, adj.get_upper() - unzoomed_val);
 137                 unzoomed_page = max(unzoomed_page, min_page_size);
 138                 break;
 139         default:
 140                 break;
 141         }
 142
 143         /* Then we handle zoom, which is dragging horizontally. We zoom around the area that is
 144          * the current y pointer value, not from the area that was the start of the drag.
 145          * We don't start doing zoom until we are at least one scroomer width outside the scroomer's
 146          * area.
 147          */
 148
 149         if (ev->x > (get_width() * 2)) {
 150                 zoom = ev->x - get_width();
 151
 152                 double higher = unzoomed_val + unzoomed_page - half_min_page - val_at_pointer;
 153                 double lower = val_at_pointer - (unzoomed_val + half_min_page);
 154
 155                 higher *= zoom / 128;
 156                 lower *= zoom / 128;
 157
 158                 val = unzoomed_val + lower;
 159                 page = unzoomed_page - higher - lower;
 160
 161                 page = max(page, min_page_size);
 162
 163                 if (lower < 0) {
 164                         val = max(val, val_at_pointer - half_min_page);
 165                 } else if (lower > 0) {
 166                         val = min(val, val_at_pointer - half_min_page);
 167                 }
 168
 169                 val = min(val, adj.get_upper() - min_page_size);
 170                 page = min(page, adj.get_upper() - val);
 171         } else if (ev->x < 0) {
 172                 /* on zoom out increase the page size as well as moving the range towards the mouse pos*/
 173                 /*zoom = abs(ev->x);
 174
 175                 double higher = unzoomed_val + unzoomed_page - half_min_page - val_at_pointer;
 176                 double lower = val_at_pointer - (unzoomed_val + half_min_page);
 177
 178                 higher *= zoom / 128;
 179                 lower *= zoom / 128;
 180
 181                 val = unzoomed_val + lower;
 182                 page = unzoomed_page - higher - lower;
 183
 184                 page = max(page, min_page_size);
 185
 186                 if (lower < 0) {
 187                         val = max(val, val_at_pointer - half_min_page);
 188                 }
 189                 else if (lower > 0) {
 190                         val = min(val, val_at_pointer - half_min_page);
 191                 }
 192
 193                 val = min(val, adj.get_upper() - min_page_size);
 194                 page = min(page, adj.get_upper() - val);*/
 195
 196                 val = unzoomed_val;
 197                 page = unzoomed_page;
 198         } else {
 199                 val = unzoomed_val;
 200                 page = unzoomed_page;
 201         }
 202
 203         /* Round these values to stop the scroomer handlers quivering about during drags */
 204         adj.set_page_size (rint (page));
 205         adj.set_value (rint (val));
 206         adj.value_changed();
 207
 208         return true;
 209 }
 210
 211 bool
 212 Scroomer::on_scroll_event (GdkEventScroll* ev)
 213 {
 214         switch (ev->direction) {
 215         case GDK_SCROLL_UP:
 216                 adj.set_value (min (adj.get_value() + adj.get_page_size() / 10.0, adj.get_upper() - adj.get_page_size()));
 217                 break;
 218         case GDK_SCROLL_DOWN:
 219                 adj.set_value (adj.get_value() - adj.get_page_size() / 10.0);
 220                 break;
 221         default:
 222                 return false;
 223         }
 224
 225         return true;
 226 }
 227
 228 bool
 229 Scroomer::on_button_press_event (GdkEventButton* ev)
 230 {
 231         if (ev->button == 1 || ev->button == 3) {
 232                 Component comp = point_in(ev->y);
 233
 234                 if (comp == Total || comp == None) {
 235                         return false;
 236                 }
 237
 238                 add_modal_grab();
 239                 grab_comp = comp;
 240                 grab_y = ev->y;
 241                 unzoomed_val = adj.get_value();
 242                 unzoomed_page = adj.get_page_size();
 243                 grab_window = ev->window;
 244
 245                 if (ev->button == 3){
 246                         pinch = true;
 247                 } else {
 248                         pinch = false;
 249                 }
 250
 251                 DragStarting (); /* EMIT SIGNAL */
 252         }
 253
 254         if (ev->type == GDK_2BUTTON_PRESS && ev->button == 1) {
 255                 DoubleClicked();
 256         }
 257
 258         return true;
 259 }
 260
 261 bool
 262 Scroomer::on_button_release_event (GdkEventButton* ev)
 263 {
 264         if (grab_comp == None || grab_comp == Total) {
 265                 return true;
 266         }
 267
 268         if (ev->window != grab_window) {
 269                 grab_y = ev->y;
 270                 grab_window = ev->window;
 271                 return true;
 272         }
 273
 274         if (ev->button != 1 && ev->button != 3) {
 275                 return true;
 276         }
 277
 278         switch (grab_comp) {
 279         case TopBase:
 280                 break;
 281         case Handle1:
 282                 break;
 283         case Slider:
 284                 break;
 285         case Handle2:
 286                 break;
 287         case BottomBase:
 288                 break;
 289         default:
 290                 break;
 291         }
 292
 293         grab_comp = None;
 294
 295         remove_modal_grab();
 296         DragFinishing (); /* EMIT SIGNAL */
 297         return true;
 298 }
 299
 300 void
 301 Scroomer::on_size_allocate (Allocation& a)
 302 {
 303         Gtk::DrawingArea::on_size_allocate(a);
 304
 305         position[Total] = a.get_height();
 306         set_min_page_size(min_page_size);
 307         update();
 308 }
 309
 310 /** Assumes that x and width are correct, and they will not be altered.
 311  */
 312 void
 313 Scroomer::set_comp_rect(GdkRectangle& r, Component c) const
 314 {
 315         int index = (int) c;
 316
 317         switch (c) {
 318         case None:
 319                 return;
 320         case Total:
 321                 r.y = 0;
 322                 r.height = position[Total];
 323                 break;
 324         default:
 325                 r.y = position[index];
 326                 r.height = position[index+1] - position[index];
 327                 break;
 328         }
 329 }
 330
 331 Scroomer::Component
 332 Scroomer::point_in(double point) const
 333 {
 334         for (int i = 0; i < Total; ++i) {
 335                 if (position[i+1] >= point) {
 336                         return (Component) i;
 337                 }
 338         }
 339
 340         return None;
 341 }
 342
 343 void
 344 Scroomer::set_min_page_size(double ps)
 345 {
 346         double coeff = ((double)position[Total]) / (adj.get_upper() - adj.get_lower());
 347
 348         min_page_size = ps;
 349         handle_size = (int) floor((ps * coeff) / 2);
 350 }
 351
 352 void
 353 Scroomer::update()
 354 {
 355         double range = adj.get_upper() - adj.get_lower();
 356         //double value = adj.get_value() - adj.get_lower();
 357         int height = position[Total];
 358         double coeff = ((double) height) / range;
 359
 360         /* save the old positions to calculate update regions later*/
 361         for (int i = Handle1; i < Total; ++i) {
 362                 old_pos[i] = position[i];
 363         }
 364
 365         position[BottomBase] = (int) floor(height - (adj.get_value() * coeff));
 366         position[Handle2] = position[BottomBase] - handle_size;
 367
 368         position[Handle1] = (int) floor(height - ((adj.get_value() + adj.get_page_size()) * coeff));
 369         position[Slider] = position[Handle1] + handle_size;
 370 }
 371
 372 void
 373 Scroomer::adjustment_changed()
 374 {
 375         //cerr << floor(adj.get_value()) << " " << floor(adj.get_value() + adj.get_page_size()) << endl;
 376         Gdk::Rectangle rect;
 377         Glib::RefPtr<Gdk::Window> win = get_window();
 378
 379         update();
 380
 381         if (!win) {
 382                 return;
 383         }
 384
 385         rect.set_x(0);
 386         rect.set_width(get_width());
 387
 388         if (position[Handle1] < old_pos[Handle1]) {
 389                 rect.set_y(position[Handle1]);
 390                 rect.set_height(old_pos[Slider] - position[Handle1]);
 391                 win->invalidate_rect(rect, false);
 392         } else if (position[Handle1] > old_pos[Handle1]) {
 393                 rect.set_y(old_pos[Handle1]);
 394                 rect.set_height(position[Slider] - old_pos[Handle1]);
 395                 win->invalidate_rect(rect, false);
 396         }
 397
 398         if (position[Handle2] < old_pos[Handle2]) {
 399                 rect.set_y(position[Handle2]);
 400                 rect.set_height(old_pos[BottomBase] - position[Handle2]);
 401                 win->invalidate_rect(rect, false);
 402         } else if (position[Handle2] > old_pos[Handle2]) {
 403                 rect.set_y(old_pos[Handle2]);
 404                 rect.set_height(position[BottomBase] - old_pos[Handle2]);
 405                 win->invalidate_rect(rect, false);
 406         }
 407 }
 408