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events.cpp

/* ScummVM - Graphic Adventure Engine
 *
 * ScummVM is the legal property of its developers, whose names
 * are too numerous to list here. Please refer to the COPYRIGHT
 * file distributed with this source distribution.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.

 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.

 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * $URL: https://scummvm.svn.sourceforge.net/svnroot/scummvm/scummvm/tags/release-1-2-1/backends/platform/sdl/events.cpp $
 * $Id: events.cpp 49902 2010-06-16 07:22:54Z tdhs $
 *
 */

#include "backends/platform/sdl/sdl.h"
#include "common/util.h"
#include "common/events.h"
#include "graphics/scaler/aspect.h" // for aspect2Real

// FIXME move joystick defines out and replace with confile file options
// we should really allow users to map any key to a joystick button
#define JOY_DEADZONE 3200

#ifndef __SYMBIAN32__ // Symbian wants dialog joystick i.e cursor for movement/selection
      #define JOY_ANALOG
#endif

// #define JOY_INVERT_Y
#define JOY_XAXIS 0
#define JOY_YAXIS 1
// buttons
#define JOY_BUT_LMOUSE 0
#define JOY_BUT_RMOUSE 2
#define JOY_BUT_ESCAPE 3
#define JOY_BUT_PERIOD 1
#define JOY_BUT_SPACE 4
#define JOY_BUT_F5 5




static int mapKey(SDLKey key, SDLMod mod, Uint16 unicode) {
      if (key >= SDLK_F1 && key <= SDLK_F9) {
            return key - SDLK_F1 + Common::ASCII_F1;
      } else if (key >= SDLK_KP0 && key <= SDLK_KP9) {
            return key - SDLK_KP0 + '0';
      } else if (key >= SDLK_UP && key <= SDLK_PAGEDOWN) {
            return key;
      } else if (unicode) {
            return unicode;
      } else if (key >= 'a' && key <= 'z' && (mod & KMOD_SHIFT)) {
            return key & ~0x20;
      } else if (key >= SDLK_NUMLOCK && key <= SDLK_EURO) {
            return 0;
      }
      return key;
}

void OSystem_SDL::fillMouseEvent(Common::Event &event, int x, int y) {
      event.mouse.x = x;
      event.mouse.y = y;

      // Update the "keyboard mouse" coords
      _km.x = x;
      _km.y = y;

      // Adjust for the screen scaling
      if (!_overlayVisible) {
            event.mouse.x /= _videoMode.scaleFactor;
            event.mouse.y /= _videoMode.scaleFactor;
            if (_videoMode.aspectRatioCorrection)
                  event.mouse.y = aspect2Real(event.mouse.y);
      }
}

void OSystem_SDL::handleKbdMouse() {
      uint32 curTime = getMillis();
      if (curTime >= _km.last_time + _km.delay_time) {
            _km.last_time = curTime;
            if (_km.x_down_count == 1) {
                  _km.x_down_time = curTime;
                  _km.x_down_count = 2;
            }
            if (_km.y_down_count == 1) {
                  _km.y_down_time = curTime;
                  _km.y_down_count = 2;
            }

            if (_km.x_vel || _km.y_vel) {
                  if (_km.x_down_count) {
                        if (curTime > _km.x_down_time + _km.delay_time * 12) {
                              if (_km.x_vel > 0)
                                    _km.x_vel++;
                              else
                                    _km.x_vel--;
                        } else if (curTime > _km.x_down_time + _km.delay_time * 8) {
                              if (_km.x_vel > 0)
                                    _km.x_vel = 5;
                              else
                                    _km.x_vel = -5;
                        }
                  }
                  if (_km.y_down_count) {
                        if (curTime > _km.y_down_time + _km.delay_time * 12) {
                              if (_km.y_vel > 0)
                                    _km.y_vel++;
                              else
                                    _km.y_vel--;
                        } else if (curTime > _km.y_down_time + _km.delay_time * 8) {
                              if (_km.y_vel > 0)
                                    _km.y_vel = 5;
                              else
                                    _km.y_vel = -5;
                        }
                  }

                  _km.x += _km.x_vel;
                  _km.y += _km.y_vel;

                  if (_km.x < 0) {
                        _km.x = 0;
                        _km.x_vel = -1;
                        _km.x_down_count = 1;
                  } else if (_km.x > _km.x_max) {
                        _km.x = _km.x_max;
                        _km.x_vel = 1;
                        _km.x_down_count = 1;
                  }

                  if (_km.y < 0) {
                        _km.y = 0;
                        _km.y_vel = -1;
                        _km.y_down_count = 1;
                  } else if (_km.y > _km.y_max) {
                        _km.y = _km.y_max;
                        _km.y_vel = 1;
                        _km.y_down_count = 1;
                  }

                  SDL_WarpMouse((Uint16)_km.x, (Uint16)_km.y);
            }
      }
}

static void SDLModToOSystemKeyFlags(SDLMod mod, Common::Event &event) {

      event.kbd.flags = 0;

#ifdef LINUPY
      // Yopy has no ALT key, steal the SHIFT key
      // (which isn't used much anyway)
      if (mod & KMOD_SHIFT)
            event.kbd.flags |= Common::KBD_ALT;
#else
      if (mod & KMOD_SHIFT)
            event.kbd.flags |= Common::KBD_SHIFT;
      if (mod & KMOD_ALT)
            event.kbd.flags |= Common::KBD_ALT;
#endif
      if (mod & KMOD_CTRL)
            event.kbd.flags |= Common::KBD_CTRL;

      // Sticky flags
      if (mod & KMOD_NUM)
            event.kbd.flags |= Common::KBD_NUM;
      if (mod & KMOD_CAPS)
            event.kbd.flags |= Common::KBD_CAPS;
}

00181 bool OSystem_SDL::pollEvent(Common::Event &event) {
      SDL_Event ev;
      ev.type = SDL_NOEVENT;

      handleKbdMouse();

      // If the screen mode changed, send an Common::EVENT_SCREEN_CHANGED
      if (_modeChanged) {
            _modeChanged = false;
            event.type = Common::EVENT_SCREEN_CHANGED;
            return true;
      }

      while (SDL_PollEvent(&ev)) {
            preprocessEvents(&ev);
            if (dispatchSDLEvent(ev, event))
                  return true;
      }
      return false;
}

bool OSystem_SDL::dispatchSDLEvent(SDL_Event &ev, Common::Event &event) {
      switch (ev.type) {
      case SDL_KEYDOWN:
            return handleKeyDown(ev, event);
      case SDL_KEYUP:
            return handleKeyUp(ev, event);
      case SDL_MOUSEMOTION:
            return handleMouseMotion(ev, event);
      case SDL_MOUSEBUTTONDOWN:
            return handleMouseButtonDown(ev, event);
      case SDL_MOUSEBUTTONUP:
            return handleMouseButtonUp(ev, event);
      case SDL_JOYBUTTONDOWN:
            return handleJoyButtonDown(ev, event);
      case SDL_JOYBUTTONUP:
            return handleJoyButtonUp(ev, event);
      case SDL_JOYAXISMOTION:
            return handleJoyAxisMotion(ev, event);

      case SDL_VIDEOEXPOSE:
            _forceFull = true;
            break;

      case SDL_QUIT:
            event.type = Common::EVENT_QUIT;
            return true;

      }

      return false;
}


bool OSystem_SDL::handleKeyDown(SDL_Event &ev, Common::Event &event) {

      SDLModToOSystemKeyFlags(SDL_GetModState(), event);

      // Handle scroll lock as a key modifier
      if (ev.key.keysym.sym == SDLK_SCROLLOCK)
            _scrollLock = !_scrollLock;

      if (_scrollLock)
            event.kbd.flags |= Common::KBD_SCRL;

      // Alt-Return and Alt-Enter toggle full screen mode
      if (event.kbd.hasFlags(Common::KBD_ALT) && (ev.key.keysym.sym == SDLK_RETURN || ev.key.keysym.sym == SDLK_KP_ENTER)) {
            beginGFXTransaction();
                  setFullscreenMode(!_videoMode.fullscreen);
            endGFXTransaction();
#ifdef USE_OSD
            if (_videoMode.fullscreen)
                  displayMessageOnOSD("Fullscreen mode");
            else
                  displayMessageOnOSD("Windowed mode");
#endif

            return false;
      }

      // Alt-S: Create a screenshot
      if (event.kbd.hasFlags(Common::KBD_ALT) && ev.key.keysym.sym == 's') {
            char filename[20];

            for (int n = 0;; n++) {
                  SDL_RWops *file;

                  sprintf(filename, "scummvm%05d.bmp", n);
                  file = SDL_RWFromFile(filename, "r");
                  if (!file)
                        break;
                  SDL_RWclose(file);
            }
            if (saveScreenshot(filename))
                  printf("Saved '%s'\n", filename);
            else
                  printf("Could not save screenshot!\n");
            return false;
      }

      // Ctrl-m toggles mouse capture
      if (event.kbd.hasFlags(Common::KBD_CTRL) && ev.key.keysym.sym == 'm') {
            toggleMouseGrab();
            return false;
      }

#if defined(MACOSX)
      // On Macintosh', Cmd-Q quits
      if ((ev.key.keysym.mod & KMOD_META) && ev.key.keysym.sym == 'q') {
            event.type = Common::EVENT_QUIT;
            return true;
      }
#elif defined(UNIX)
      // On other unices, Control-Q quits
      if ((ev.key.keysym.mod & KMOD_CTRL) && ev.key.keysym.sym == 'q') {
            event.type = Common::EVENT_QUIT;
            return true;
      }
#else
      // Ctrl-z and Alt-X quit
      if ((event.kbd.hasFlags(Common::KBD_CTRL) && ev.key.keysym.sym == 'z') || (event.kbd.hasFlags(Common::KBD_ALT) && ev.key.keysym.sym == 'x')) {
            event.type = Common::EVENT_QUIT;
            return true;
      }
#endif

      if ((ev.key.keysym.mod & KMOD_CTRL) && ev.key.keysym.sym == 'u') {
            event.type = Common::EVENT_MUTE;
            return true;
      }

      // Ctrl-Alt-<key> will change the GFX mode
      if ((event.kbd.flags & (Common::KBD_CTRL|Common::KBD_ALT)) == (Common::KBD_CTRL|Common::KBD_ALT)) {
            if (handleScalerHotkeys(ev.key))
                  return false;
      }

      if (remapKey(ev, event))
            return true;

      event.type = Common::EVENT_KEYDOWN;
      event.kbd.keycode = (Common::KeyCode)ev.key.keysym.sym;
      event.kbd.ascii = mapKey(ev.key.keysym.sym, ev.key.keysym.mod, ev.key.keysym.unicode);

      return true;
}

bool OSystem_SDL::handleKeyUp(SDL_Event &ev, Common::Event &event) {
      if (remapKey(ev, event))
            return true;

      event.type = Common::EVENT_KEYUP;
      event.kbd.keycode = (Common::KeyCode)ev.key.keysym.sym;
      event.kbd.ascii = mapKey(ev.key.keysym.sym, ev.key.keysym.mod, ev.key.keysym.unicode);

      // Ctrl-Alt-<key> will change the GFX mode
      SDLModToOSystemKeyFlags(SDL_GetModState(), event);

      // Set the scroll lock sticky flag
      if (_scrollLock)
            event.kbd.flags |= Common::KBD_SCRL;

      if (isScalerHotkey(event))
            // Swallow these key up events
            return false;

      return true;
}

bool OSystem_SDL::handleMouseMotion(SDL_Event &ev, Common::Event &event) {
      event.type = Common::EVENT_MOUSEMOVE;
      fillMouseEvent(event, ev.motion.x, ev.motion.y);

      setMousePos(event.mouse.x, event.mouse.y);
      return true;
}

bool OSystem_SDL::handleMouseButtonDown(SDL_Event &ev, Common::Event &event) {
      if (ev.button.button == SDL_BUTTON_LEFT)
            event.type = Common::EVENT_LBUTTONDOWN;
      else if (ev.button.button == SDL_BUTTON_RIGHT)
            event.type = Common::EVENT_RBUTTONDOWN;
#if defined(SDL_BUTTON_WHEELUP) && defined(SDL_BUTTON_WHEELDOWN)
      else if (ev.button.button == SDL_BUTTON_WHEELUP)
            event.type = Common::EVENT_WHEELUP;
      else if (ev.button.button == SDL_BUTTON_WHEELDOWN)
            event.type = Common::EVENT_WHEELDOWN;
#endif
#if defined(SDL_BUTTON_MIDDLE)
      else if (ev.button.button == SDL_BUTTON_MIDDLE)
            event.type = Common::EVENT_MBUTTONDOWN;
#endif
      else
            return false;

      fillMouseEvent(event, ev.button.x, ev.button.y);

      return true;
}

bool OSystem_SDL::handleMouseButtonUp(SDL_Event &ev, Common::Event &event) {
      if (ev.button.button == SDL_BUTTON_LEFT)
            event.type = Common::EVENT_LBUTTONUP;
      else if (ev.button.button == SDL_BUTTON_RIGHT)
            event.type = Common::EVENT_RBUTTONUP;
#if defined(SDL_BUTTON_MIDDLE)
      else if (ev.button.button == SDL_BUTTON_MIDDLE)
            event.type = Common::EVENT_MBUTTONUP;
#endif
      else
            return false;
      fillMouseEvent(event, ev.button.x, ev.button.y);

      return true;
}

bool OSystem_SDL::handleJoyButtonDown(SDL_Event &ev, Common::Event &event) {
      if (ev.jbutton.button == JOY_BUT_LMOUSE) {
            event.type = Common::EVENT_LBUTTONDOWN;
            fillMouseEvent(event, _km.x, _km.y);
      } else if (ev.jbutton.button == JOY_BUT_RMOUSE) {
            event.type = Common::EVENT_RBUTTONDOWN;
            fillMouseEvent(event, _km.x, _km.y);
      } else {
            event.type = Common::EVENT_KEYDOWN;
            switch (ev.jbutton.button) {
            case JOY_BUT_ESCAPE:
                  event.kbd.keycode = Common::KEYCODE_ESCAPE;
                  event.kbd.ascii = mapKey(SDLK_ESCAPE, ev.key.keysym.mod, 0);
                  break;
            case JOY_BUT_PERIOD:
                  event.kbd.keycode = Common::KEYCODE_PERIOD;
                  event.kbd.ascii = mapKey(SDLK_PERIOD, ev.key.keysym.mod, 0);
                  break;
            case JOY_BUT_SPACE:
                  event.kbd.keycode = Common::KEYCODE_SPACE;
                  event.kbd.ascii = mapKey(SDLK_SPACE, ev.key.keysym.mod, 0);
                  break;
            case JOY_BUT_F5:
                  event.kbd.keycode = Common::KEYCODE_F5;
                  event.kbd.ascii = mapKey(SDLK_F5, ev.key.keysym.mod, 0);
                  break;
            }
      }
      return true;
}

bool OSystem_SDL::handleJoyButtonUp(SDL_Event &ev, Common::Event &event) {
      if (ev.jbutton.button == JOY_BUT_LMOUSE) {
            event.type = Common::EVENT_LBUTTONUP;
            fillMouseEvent(event, _km.x, _km.y);
      } else if (ev.jbutton.button == JOY_BUT_RMOUSE) {
            event.type = Common::EVENT_RBUTTONUP;
            fillMouseEvent(event, _km.x, _km.y);
      } else {
            event.type = Common::EVENT_KEYUP;
            switch (ev.jbutton.button) {
            case JOY_BUT_ESCAPE:
                  event.kbd.keycode = Common::KEYCODE_ESCAPE;
                  event.kbd.ascii = mapKey(SDLK_ESCAPE, ev.key.keysym.mod, 0);
                  break;
            case JOY_BUT_PERIOD:
                  event.kbd.keycode = Common::KEYCODE_PERIOD;
                  event.kbd.ascii = mapKey(SDLK_PERIOD, ev.key.keysym.mod, 0);
                  break;
            case JOY_BUT_SPACE:
                  event.kbd.keycode = Common::KEYCODE_SPACE;
                  event.kbd.ascii = mapKey(SDLK_SPACE, ev.key.keysym.mod, 0);
                  break;
            case JOY_BUT_F5:
                  event.kbd.keycode = Common::KEYCODE_F5;
                  event.kbd.ascii = mapKey(SDLK_F5, ev.key.keysym.mod, 0);
                  break;
            }
      }
      return true;
}

bool OSystem_SDL::handleJoyAxisMotion(SDL_Event &ev, Common::Event &event) {
      int axis = ev.jaxis.value;
      if ( axis > JOY_DEADZONE) {
            axis -= JOY_DEADZONE;
            event.type = Common::EVENT_MOUSEMOVE;
      } else if ( axis < -JOY_DEADZONE ) {
            axis += JOY_DEADZONE;
            event.type = Common::EVENT_MOUSEMOVE;
      } else
            axis = 0;

      if ( ev.jaxis.axis == JOY_XAXIS) {
#ifdef JOY_ANALOG
            _km.x_vel = axis/2000;
            _km.x_down_count = 0;
#else
            if (axis != 0) {
                  _km.x_vel = (axis > 0) ? 1:-1;
                  _km.x_down_count = 1;
            } else {
                  _km.x_vel = 0;
                  _km.x_down_count = 0;
            }
#endif

      } else if (ev.jaxis.axis == JOY_YAXIS) {
#ifndef JOY_INVERT_Y
            axis = -axis;
#endif
#ifdef JOY_ANALOG
            _km.y_vel = -axis / 2000;
            _km.y_down_count = 0;
#else
            if (axis != 0) {
                  _km.y_vel = (-axis > 0) ? 1: -1;
                  _km.y_down_count = 1;
            } else {
                  _km.y_vel = 0;
                  _km.y_down_count = 0;
            }
#endif
      }

      fillMouseEvent(event, _km.x, _km.y);

      return true;
}

bool OSystem_SDL::remapKey(SDL_Event &ev, Common::Event &event) {
#ifdef LINUPY
      // On Yopy map the End button to quit
      if ((ev.key.keysym.sym == 293)) {
            event.type = Common::EVENT_QUIT;
            return true;
      }
      // Map menu key to f5 (scumm menu)
      if (ev.key.keysym.sym == 306) {
            event.type = Common::EVENT_KEYDOWN;
            event.kbd.keycode = Common::KEYCODE_F5;
            event.kbd.ascii = mapKey(SDLK_F5, ev.key.keysym.mod, 0);
            return true;
      }
      // Map action key to action
      if (ev.key.keysym.sym == 291) {
            event.type = Common::EVENT_KEYDOWN;
            event.kbd.keycode = Common::KEYCODE_TAB;
            event.kbd.ascii = mapKey(SDLK_TAB, ev.key.keysym.mod, 0);
            return true;
      }
      // Map OK key to skip cinematic
      if (ev.key.keysym.sym == 292) {
            event.type = Common::EVENT_KEYDOWN;
            event.kbd.keycode = Common::KEYCODE_ESCAPE;
            event.kbd.ascii = mapKey(SDLK_ESCAPE, ev.key.keysym.mod, 0);
            return true;
      }
#endif

#ifdef QTOPIA
      // Quit on fn+backspace on zaurus
      if (ev.key.keysym.sym == 127) {
            event.type = Common::EVENT_QUIT;
            return true;
      }

      // Map menu key (f11) to f5 (scumm menu)
      if (ev.key.keysym.sym == SDLK_F11) {
            event.type = Common::EVENT_KEYDOWN;
            event.kbd.keycode = Common::KEYCODE_F5;
            event.kbd.ascii = mapKey(SDLK_F5, ev.key.keysym.mod, 0);
      }
      // Nap center (space) to tab (default action )
      // I wanted to map the calendar button but the calendar comes up
      //
      else if (ev.key.keysym.sym == SDLK_SPACE) {
            event.type = Common::EVENT_KEYDOWN;
            event.kbd.keycode = Common::KEYCODE_TAB;
            event.kbd.ascii = mapKey(SDLK_TAB, ev.key.keysym.mod, 0);
      }
      // Since we stole space (pause) above we'll rebind it to the tab key on the keyboard
      else if (ev.key.keysym.sym == SDLK_TAB) {
            event.type = Common::EVENT_KEYDOWN;
            event.kbd.keycode = Common::KEYCODE_SPACE;
            event.kbd.ascii = mapKey(SDLK_SPACE, ev.key.keysym.mod, 0);
      } else {
      // Let the events fall through if we didn't change them, this may not be the best way to
      // set it up, but i'm not sure how sdl would like it if we let if fall through then redid it though.
      // and yes i have an huge terminal size so i dont wrap soon enough.
            event.type = Common::EVENT_KEYDOWN;
            event.kbd.keycode = ev.key.keysym.sym;
            event.kbd.ascii = mapKey(ev.key.keysym.sym, ev.key.keysym.mod, ev.key.keysym.unicode);
      }
#endif
      return false;
}

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