libs/gtkmm2ext/auto_spin.cc

   1 /*
   2     Copyright (C) 1999 Paul Barton-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     $Id$
  19 */
  20
  21 #include <cmath>
  22 #include "gtkmm2ext/auto_spin.h"
  23 #include "gtkmm2ext/keyboard.h"
  24
  25 using namespace Gtkmm2ext;
  26 using namespace std;
  27
  28 #define upper          adjustment.get_upper()
  29 #define lower          adjustment.get_lower()
  30 #define step_increment adjustment.get_step_increment()
  31 #define page_increment adjustment.get_page_increment()
  32
  33 const unsigned int AutoSpin::initial_timer_interval = 500;   /* msecs */
  34 const unsigned int AutoSpin::timer_interval = 20;            /* msecs */
  35 const unsigned int AutoSpin::climb_timer_calls = 5;    /* between climbing */
  36
  37 AutoSpin::AutoSpin (Gtk::Adjustment &adjr, gfloat cr, bool round_to_steps_yn)
  38         : adjustment (adjr),
  39           climb_rate (cr)
  40
  41 {
  42         initial = adjustment.get_value();
  43         left_is_decrement = true;
  44         wrap = false;
  45         have_timer = false;
  46         need_timer = false;
  47         timer_calls = 0;
  48         round_to_steps = round_to_steps_yn;
  49 }
  50
  51 void
  52 AutoSpin::stop_timer ()
  53 {
  54         if (have_timer) {
  55                 g_source_remove (timeout_tag);
  56                 have_timer = false;
  57         }
  58 }
  59
  60 gint
  61 AutoSpin::stop_spinning (GdkEventButton */*ev*/)
  62 {
  63         need_timer = false;
  64         stop_timer ();
  65         return FALSE;
  66 }
  67
  68 gint
  69 AutoSpin::button_press (GdkEventButton *ev)
  70 {
  71         bool shifted = false;
  72         bool control = false;
  73         bool with_decrement = false;
  74
  75         stop_spinning (0);
  76
  77         if (ev->state & Keyboard::TertiaryModifier) {
  78                 /* use page shift */
  79
  80                 shifted = true;
  81         }
  82
  83         if (ev->state & Keyboard::PrimaryModifier) {
  84                 /* go to upper/lower bound on button1/button2 */
  85
  86                 control = true;
  87         }
  88
  89         /* XXX should figure out which button is left/right */
  90
  91         switch (ev->button) {
  92         case 1:
  93                 if (control) {
  94                         set_value (left_is_decrement ? lower : upper);
  95                         return TRUE;
  96                 } else {
  97                         if (left_is_decrement) {
  98                                 with_decrement = true;
  99                         } else {
 100                                 with_decrement = false;
 101                         }
 102                 }
 103                 break;
 104
 105         case 2:
 106                 if (!control) {
 107                         set_value (initial);
 108                 }
 109                 return TRUE;
 110                 break;
 111
 112         case 3:
 113                 if (control) {
 114                         set_value (left_is_decrement ? upper : lower);
 115                         return TRUE;
 116                 }
 117                 break;
 118
 119         case 4:
 120                 if (!control) {
 121                         adjust_value (shifted ? page_increment : step_increment);
 122                 } else {
 123                         set_value (upper);
 124                 }
 125                 return TRUE;
 126                 break;
 127
 128         case 5:
 129                 if (!control) {
 130                         adjust_value (shifted ? -page_increment : -step_increment);
 131                 } else {
 132                         set_value (lower);
 133                 }
 134                 return TRUE;
 135                 break;
 136         }
 137
 138         start_spinning (with_decrement, shifted);
 139         return TRUE;
 140 }
 141
 142 void
 143 AutoSpin::start_spinning (bool decrement, bool page)
 144 {
 145         timer_increment = page ? page_increment : step_increment;
 146
 147         if (decrement) {
 148                 timer_increment = -timer_increment;
 149         }
 150
 151         adjust_value (timer_increment);
 152
 153         have_timer = true;
 154         timer_calls = 0;
 155         timeout_tag = g_timeout_add (initial_timer_interval,
 156                                        AutoSpin::_timer,
 157                                        this);
 158 }
 159
 160 gint
 161 AutoSpin::_timer (void *arg)
 162 {
 163         return ((AutoSpin *) arg)->timer ();
 164 }
 165
 166 void
 167 AutoSpin::set_value (gfloat value)
 168 {
 169         if (round_to_steps)
 170                 adjustment.set_value (floor((value / step_increment) + 0.5f) * step_increment);
 171         else
 172                 adjustment.set_value (value);
 173 }
 174
 175 bool
 176 AutoSpin::adjust_value (gfloat increment)
 177 {
 178         gfloat val;
 179         bool done = false;
 180
 181         val = adjustment.get_value();
 182
 183         val += increment;
 184
 185         if (val > upper) {
 186                 if (wrap) {
 187                         val = lower;
 188                 } else {
 189                         val = upper;
 190                         done = true;
 191                 }
 192         } else if (val < lower) {
 193                 if (wrap) {
 194                         val = upper;
 195                 } else {
 196                         val = lower;
 197                         done = true;
 198                 }
 199         }
 200
 201         set_value(val);
 202         return done;
 203 }
 204
 205 gint
 206 AutoSpin::timer ()
 207 {
 208         bool done;
 209         int retval = FALSE;
 210
 211         done = adjust_value (timer_increment);
 212
 213         if (need_timer) {
 214
 215                 /* we're in the initial call, which happened
 216                    after initial_timer_interval msecs. Now
 217                    request a much more frequent update.
 218                 */
 219
 220                 timeout_tag = g_timeout_add (timer_interval,
 221                                                _timer,
 222                                                this);
 223                 have_timer = true;
 224                 need_timer = false;
 225
 226                 /* cancel this initial timeout */
 227
 228                 retval = FALSE;
 229
 230         } else {
 231                 /* this is the regular "fast" call after each
 232                    timer_interval msecs.
 233                 */
 234
 235                 if (timer_calls < climb_timer_calls) {
 236                         timer_calls++;
 237                 } else {
 238                         if (climb_rate > 0.0) {
 239                                 if (timer_increment > 0) {
 240                                         timer_increment += climb_rate;
 241                                 } else {
 242                                         timer_increment -= climb_rate;
 243                                 }
 244                         }
 245                         timer_calls = 0;
 246                 }
 247
 248                 if (!done) {
 249                         retval = TRUE;
 250                 }
 251         }
 252
 253         return retval;
 254 }
 255
 256 void
 257 AutoSpin::set_bounds (gfloat init, gfloat up, gfloat down, bool with_reset)
 258 {
 259         adjustment.set_upper(up);
 260         adjustment.set_lower(down);
 261
 262         initial = init;
 263
 264         adjustment.changed ();
 265
 266         if (with_reset) {
 267                 adjustment.set_value (init);
 268         }
 269 }