git.sesse.net Git - casparcg/blob - core/interaction/interaction_aggregator.h

   1 /*
   2 * Copyright (c) 2011 Sveriges Television AB <info@casparcg.com>
   3 *
   4 * This file is part of CasparCG (www.casparcg.com).
   5 *
   6 * CasparCG is free software: you can redistribute it and/or modify
   7 * it under the terms of the GNU General Public License as published by
   8 * the Free Software Foundation, either version 3 of the License, or
   9 * (at your option) any later version.
  10 *
  11 * CasparCG is distributed in the hope that it will be useful,
  12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 * GNU General Public License for more details.
  15 *
  16 * You should have received a copy of the GNU General Public License
  17 * along with CasparCG. If not, see <http://www.gnu.org/licenses/>.
  18 *
  19 * Author: Helge Norberg, helge.norberg@svt.se
  20 */
  21
  22 #pragma once
  23
  24 #include <queue>
  25 #include <functional>
  26
  27 #include <boost/optional.hpp>
  28
  29 #include "interaction_event.h"
  30 #include "interaction_sink.h"
  31 #include "../frame/frame_transform.h"
  32 #include "util.h"
  33
  34 namespace caspar { namespace core {
  35
  36 typedef std::pair<frame_transform, interaction_sink*> interaction_target;
  37 typedef std::function<boost::optional<interaction_target> (double x, double y)>
  38                 collission_detector;
  39
  40 class interaction_aggregator
  41 {
  42         std::queue<interaction_event::ptr> events_;
  43         collission_detector collission_detector_;
  44
  45
  46         boost::optional<interaction_target> clicked_and_held_;
  47         int num_buttons_clicked_and_held_                                               = 0;
  48 public:
  49         interaction_aggregator(const collission_detector& collission_detector)
  50                 : collission_detector_(collission_detector)
  51         {
  52         }
  53
  54         void offer(const interaction_event::ptr& event)
  55         {
  56                 if (!events_.empty()
  57                                 && is<mouse_move_event>(event)
  58                                 && is<mouse_move_event>(events_.back()))
  59                 {
  60                         events_.back() = event;
  61                 }
  62                 else
  63                 {
  64                         events_.push(event);
  65                 }
  66         }
  67
  68         void translate_and_send()
  69         {
  70                 while (!events_.empty())
  71                 {
  72                         translate_and_send(events_.front());
  73                         events_.pop();
  74                 }
  75         }
  76
  77         void translate_and_send(const interaction_event::ptr& event)
  78         {
  79                 if (is<position_event>(event))
  80                 {
  81                         auto pos_event = as<position_event>(event);
  82                         boost::optional<interaction_target> target;
  83
  84                         if (clicked_and_held_)
  85                                 target = clicked_and_held_;
  86                         else
  87                                 target = collission_detector_(pos_event->x, pos_event->y);
  88
  89                         if (is<mouse_button_event>(event))
  90                         {
  91                                 auto button_event = as<mouse_button_event>(event);
  92
  93                                 if (button_event->pressed)
  94                                 {
  95                                         if (num_buttons_clicked_and_held_ == 0)
  96                                                 clicked_and_held_ = target;
  97
  98                                         ++num_buttons_clicked_and_held_;
  99                                 }
 100                                 else
 101                                         --num_buttons_clicked_and_held_;
 102
 103                                 if (num_buttons_clicked_and_held_ == 0)
 104                                         clicked_and_held_.reset();
 105                         }
 106
 107                         if (target)
 108                                 target->second->on_interaction(
 109                                                 pos_event->translate(target->first));
 110                 }
 111         }
 112 };
 113
 114 }}