src/client/inputhandler.h

   1 /*
   2 Minetest
   3 Copyright (C) 2010-2013 celeron55, Perttu Ahola <celeron55@gmail.com>
   4
   5 This program is free software; you can redistribute it and/or modify
   6 it under the terms of the GNU Lesser General Public License as published by
   7 the Free Software Foundation; either version 2.1 of the License, or
   8 (at your option) any later version.
   9
  10 This program is distributed in the hope that it will be useful,
  11 but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 GNU Lesser General Public License for more details.
  14
  15 You should have received a copy of the GNU Lesser General Public License along
  16 with this program; if not, write to the Free Software Foundation, Inc.,
  17 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  18 */
  19
  20 #pragma once
  21
  22 #include "irrlichttypes_extrabloated.h"
  23 #include "joystick_controller.h"
  24 #include <list>
  25 #include "keycode.h"
  26 #include "renderingengine.h"
  27
  28 #ifdef HAVE_TOUCHSCREENGUI
  29 #include "gui/touchscreengui.h"
  30 #endif
  31
  32 class InputHandler;
  33
  34 /****************************************************************************
  35  Fast key cache for main game loop
  36  ****************************************************************************/
  37
  38 /* This is faster than using getKeySetting with the tradeoff that functions
  39  * using it must make sure that it's initialised before using it and there is
  40  * no error handling (for example bounds checking). This is really intended for
  41  * use only in the main running loop of the client (the_game()) where the faster
  42  * (up to 10x faster) key lookup is an asset. Other parts of the codebase
  43  * (e.g. formspecs) should continue using getKeySetting().
  44  */
  45 struct KeyCache
  46 {
  47
  48         KeyCache()
  49         {
  50                 handler = NULL;
  51                 populate();
  52                 populate_nonchanging();
  53         }
  54
  55         void populate();
  56
  57         // Keys that are not settings dependent
  58         void populate_nonchanging();
  59
  60         KeyPress key[KeyType::INTERNAL_ENUM_COUNT];
  61         InputHandler *handler;
  62 };
  63
  64 class KeyList : private std::list<KeyPress>
  65 {
  66         typedef std::list<KeyPress> super;
  67         typedef super::iterator iterator;
  68         typedef super::const_iterator const_iterator;
  69
  70         virtual const_iterator find(const KeyPress &key) const
  71         {
  72                 const_iterator f(begin());
  73                 const_iterator e(end());
  74
  75                 while (f != e) {
  76                         if (*f == key)
  77                                 return f;
  78
  79                         ++f;
  80                 }
  81
  82                 return e;
  83         }
  84
  85         virtual iterator find(const KeyPress &key)
  86         {
  87                 iterator f(begin());
  88                 iterator e(end());
  89
  90                 while (f != e) {
  91                         if (*f == key)
  92                                 return f;
  93
  94                         ++f;
  95                 }
  96
  97                 return e;
  98         }
  99
 100 public:
 101         void clear() { super::clear(); }
 102
 103         void set(const KeyPress &key)
 104         {
 105                 if (find(key) == end())
 106                         push_back(key);
 107         }
 108
 109         void unset(const KeyPress &key)
 110         {
 111                 iterator p(find(key));
 112
 113                 if (p != end())
 114                         erase(p);
 115         }
 116
 117         void toggle(const KeyPress &key)
 118         {
 119                 iterator p(this->find(key));
 120
 121                 if (p != end())
 122                         erase(p);
 123                 else
 124                         push_back(key);
 125         }
 126
 127         bool operator[](const KeyPress &key) const { return find(key) != end(); }
 128 };
 129
 130 class MyEventReceiver : public IEventReceiver
 131 {
 132 public:
 133         // This is the one method that we have to implement
 134         virtual bool OnEvent(const SEvent &event);
 135
 136         bool IsKeyDown(const KeyPress &keyCode) const { return keyIsDown[keyCode]; }
 137
 138         // Checks whether a key was down and resets the state
 139         bool WasKeyDown(const KeyPress &keyCode)
 140         {
 141                 bool b = keyWasDown[keyCode];
 142                 if (b)
 143                         keyWasDown.unset(keyCode);
 144                 return b;
 145         }
 146
 147         // Checks whether a key was just pressed. State will be cleared
 148         // in the subsequent iteration of Game::processPlayerInteraction
 149         bool WasKeyPressed(const KeyPress &keycode) const { return keyWasPressed[keycode]; }
 150
 151         // Checks whether a key was just released. State will be cleared
 152         // in the subsequent iteration of Game::processPlayerInteraction
 153         bool WasKeyReleased(const KeyPress &keycode) const { return keyWasReleased[keycode]; }
 154
 155         void listenForKey(const KeyPress &keyCode) { keysListenedFor.set(keyCode); }
 156         void dontListenForKeys() { keysListenedFor.clear(); }
 157
 158         s32 getMouseWheel()
 159         {
 160                 s32 a = mouse_wheel;
 161                 mouse_wheel = 0;
 162                 return a;
 163         }
 164
 165         void clearInput()
 166         {
 167                 keyIsDown.clear();
 168                 keyWasDown.clear();
 169                 keyWasPressed.clear();
 170                 keyWasReleased.clear();
 171
 172                 mouse_wheel = 0;
 173         }
 174
 175         void clearWasKeyPressed()
 176         {
 177                 keyWasPressed.clear();
 178         }
 179
 180         void clearWasKeyReleased()
 181         {
 182                 keyWasReleased.clear();
 183         }
 184
 185         MyEventReceiver()
 186         {
 187 #ifdef HAVE_TOUCHSCREENGUI
 188                 m_touchscreengui = NULL;
 189 #endif
 190         }
 191
 192         s32 mouse_wheel = 0;
 193
 194         JoystickController *joystick = nullptr;
 195
 196 #ifdef HAVE_TOUCHSCREENGUI
 197         TouchScreenGUI *m_touchscreengui;
 198 #endif
 199
 200 private:
 201         // The current state of keys
 202         KeyList keyIsDown;
 203
 204         // Whether a key was down
 205         KeyList keyWasDown;
 206
 207         // Whether a key has just been pressed
 208         KeyList keyWasPressed;
 209
 210         // Whether a key has just been released
 211         KeyList keyWasReleased;
 212
 213         // List of keys we listen for
 214         // TODO perhaps the type of this is not really
 215         // performant as KeyList is designed for few but
 216         // often changing keys, and keysListenedFor is expected
 217         // to change seldomly but contain lots of keys.
 218         KeyList keysListenedFor;
 219 };
 220
 221 class InputHandler
 222 {
 223 public:
 224         InputHandler()
 225         {
 226                 keycache.handler = this;
 227                 keycache.populate();
 228         }
 229
 230         virtual ~InputHandler() = default;
 231
 232         virtual bool isRandom() const
 233         {
 234                 return false;
 235         }
 236
 237         virtual bool isKeyDown(GameKeyType k) = 0;
 238         virtual bool wasKeyDown(GameKeyType k) = 0;
 239         virtual bool wasKeyPressed(GameKeyType k) = 0;
 240         virtual bool wasKeyReleased(GameKeyType k) = 0;
 241         virtual bool cancelPressed() = 0;
 242
 243         virtual void clearWasKeyPressed() {}
 244         virtual void clearWasKeyReleased() {}
 245
 246         virtual void listenForKey(const KeyPress &keyCode) {}
 247         virtual void dontListenForKeys() {}
 248
 249         virtual v2s32 getMousePos() = 0;
 250         virtual void setMousePos(s32 x, s32 y) = 0;
 251
 252         virtual s32 getMouseWheel() = 0;
 253
 254         virtual void step(float dtime) {}
 255
 256         virtual void clear() {}
 257
 258         JoystickController joystick;
 259         KeyCache keycache;
 260 };
 261 /*
 262         Separated input handler
 263 */
 264
 265 class RealInputHandler : public InputHandler
 266 {
 267 public:
 268         RealInputHandler(MyEventReceiver *receiver) : m_receiver(receiver)
 269         {
 270                 m_receiver->joystick = &joystick;
 271         }
 272         virtual bool isKeyDown(GameKeyType k)
 273         {
 274                 return m_receiver->IsKeyDown(keycache.key[k]) || joystick.isKeyDown(k);
 275         }
 276         virtual bool wasKeyDown(GameKeyType k)
 277         {
 278                 return m_receiver->WasKeyDown(keycache.key[k]) || joystick.wasKeyDown(k);
 279         }
 280         virtual bool wasKeyPressed(GameKeyType k)
 281         {
 282                 return m_receiver->WasKeyPressed(keycache.key[k]) || joystick.wasKeyPressed(k);
 283         }
 284         virtual bool wasKeyReleased(GameKeyType k)
 285         {
 286                 return m_receiver->WasKeyReleased(keycache.key[k]) || joystick.wasKeyReleased(k);
 287         }
 288         virtual bool cancelPressed()
 289         {
 290                 return wasKeyDown(KeyType::ESC) || m_receiver->WasKeyDown(CancelKey);
 291         }
 292         virtual void clearWasKeyPressed()
 293         {
 294                 m_receiver->clearWasKeyPressed();
 295         }
 296         virtual void clearWasKeyReleased()
 297         {
 298                 m_receiver->clearWasKeyReleased();
 299         }
 300         virtual void listenForKey(const KeyPress &keyCode)
 301         {
 302                 m_receiver->listenForKey(keyCode);
 303         }
 304         virtual void dontListenForKeys() { m_receiver->dontListenForKeys(); }
 305         virtual v2s32 getMousePos()
 306         {
 307                 if (RenderingEngine::get_raw_device()->getCursorControl()) {
 308                         return RenderingEngine::get_raw_device()
 309                                         ->getCursorControl()
 310                                         ->getPosition();
 311                 }
 312
 313                 return m_mousepos;
 314         }
 315
 316         virtual void setMousePos(s32 x, s32 y)
 317         {
 318                 if (RenderingEngine::get_raw_device()->getCursorControl()) {
 319                         RenderingEngine::get_raw_device()
 320                                         ->getCursorControl()
 321                                         ->setPosition(x, y);
 322                 } else {
 323                         m_mousepos = v2s32(x, y);
 324                 }
 325         }
 326
 327         virtual s32 getMouseWheel() { return m_receiver->getMouseWheel(); }
 328
 329         void clear()
 330         {
 331                 joystick.clear();
 332                 m_receiver->clearInput();
 333         }
 334
 335 private:
 336         MyEventReceiver *m_receiver = nullptr;
 337         v2s32 m_mousepos;
 338 };
 339
 340 class RandomInputHandler : public InputHandler
 341 {
 342 public:
 343         RandomInputHandler() = default;
 344
 345         bool isRandom() const
 346         {
 347                 return true;
 348         }
 349
 350         virtual bool isKeyDown(GameKeyType k) { return keydown[keycache.key[k]]; }
 351         virtual bool wasKeyDown(GameKeyType k) { return false; }
 352         virtual bool wasKeyPressed(GameKeyType k) { return false; }
 353         virtual bool wasKeyReleased(GameKeyType k) { return false; }
 354         virtual bool cancelPressed() { return false; }
 355         virtual v2s32 getMousePos() { return mousepos; }
 356         virtual void setMousePos(s32 x, s32 y) { mousepos = v2s32(x, y); }
 357
 358         virtual s32 getMouseWheel() { return 0; }
 359
 360         virtual void step(float dtime);
 361
 362         s32 Rand(s32 min, s32 max);
 363
 364 private:
 365         KeyList keydown;
 366         v2s32 mousepos;
 367         v2s32 mousespeed;
 368 };