sdl-events.h

/* 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 3 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, see <http://www.gnu.org/licenses/>.
 *
 */
 
#ifndef BACKEND_EVENTS_SDL_H
#define BACKEND_EVENTS_SDL_H
 
#include "backends/platform/sdl/sdl-sys.h"
#include "backends/graphics/sdl/sdl-graphics.h"
 
#include "common/events.h"
 
// Type names which changed between SDL 1.2 and SDL 2.
#if !SDL_VERSION_ATLEAST(2, 0, 0)
typedef SDLKey     SDL_Keycode;
typedef SDLMod     SDL_Keymod;
typedef SDL_keysym SDL_Keysym;
#endif
 
class SdlEventSource : public Common::EventSource {
public:
    SdlEventSource();
    virtual ~SdlEventSource();
 
    void setGraphicsManager(SdlGraphicsManager *gMan) { _graphicsManager = gMan; }
 
    bool pollEvent(Common::Event &event) override;
 
    void fakeWarpMouse(const int x, const int y);
 
    bool isJoystickConnected() const;
 
    void setEngineRunning(bool value);
 
protected:
    bool _scrollLock;
 
    bool _engineRunning;
 
    int _mouseX;
    int _mouseY;
 
    SDL_Joystick *_joystick;
 
#if SDL_VERSION_ATLEAST(3, 0, 0)
    SDL_Gamepad *_controller;
#elif SDL_VERSION_ATLEAST(2, 0, 0)
    SDL_GameController *_controller;
#endif
 
    int _lastScreenID;
 
    SdlGraphicsManager *_graphicsManager;
 
    void loadGameControllerMappingFile();
 
    void openJoystick(int joystickIndex);
 
    void closeJoystick();
 
    virtual void preprocessEvents(SDL_Event *event) {}
 
    virtual bool dispatchSDLEvent(SDL_Event &ev, Common::Event &event);
 
 
 
    virtual bool handleKeyDown(SDL_Event &ev, Common::Event &event);
    virtual bool handleKeyUp(SDL_Event &ev, Common::Event &event);
    virtual bool handleMouseMotion(SDL_Event &ev, Common::Event &event);
    virtual bool handleMouseButtonDown(SDL_Event &ev, Common::Event &event);
    virtual bool handleMouseButtonUp(SDL_Event &ev, Common::Event &event);
    virtual bool handleSysWMEvent(SDL_Event &ev, Common::Event &event);
    virtual int mapSDLJoystickButtonToOSystem(Uint8 sdlButton);
    virtual bool handleJoyButtonDown(SDL_Event &ev, Common::Event &event);
    virtual bool handleJoyButtonUp(SDL_Event &ev, Common::Event &event);
    virtual bool handleJoyAxisMotion(SDL_Event &ev, Common::Event &event);
    virtual bool handleJoyHatMotion(SDL_Event &ev, Common::Event &event);
 
#if SDL_VERSION_ATLEAST(2, 0, 0)
    virtual bool handleJoystickAdded(const SDL_JoyDeviceEvent &device, Common::Event &event);
    virtual bool handleJoystickRemoved(const SDL_JoyDeviceEvent &device, Common::Event &event);
    virtual int mapSDLControllerButtonToOSystem(Uint8 sdlButton);
    virtual bool handleControllerButton(const SDL_Event &ev, Common::Event &event, bool buttonUp);
    virtual bool handleControllerAxisMotion(const SDL_Event &ev, Common::Event &event);
 
    virtual bool isTouchPortTouchpadMode(SDL_TouchID port);
    virtual bool isTouchPortActive(SDL_TouchID port);
    virtual Common::Point getTouchscreenSize();
    virtual void convertTouchXYToGameXY(float touchX, float touchY, int *gameX, int *gameY);
#endif
 
 
    virtual bool processMouseEvent(Common::Event &event, int x, int y, int relx = 0, int rely = 0);
 
    virtual bool remapKey(SDL_Event &ev, Common::Event &event);
 
    virtual int mapKey(SDL_Keycode key, SDL_Keymod mod, Uint16 unicode);
 
    virtual void SDLModToOSystemKeyFlags(SDL_Keymod mod, Common::Event &event);
 
    Common::KeyCode SDLToOSystemKeycode(const SDL_Keycode key);
 
    bool handleResizeEvent(Common::Event &event, int w, int h);
 
    uint32 obtainUnicode(const SDL_KeyboardEvent &key);
 
#if !SDL_VERSION_ATLEAST(3, 0, 0)
    SDL_Keycode obtainKeycode(const SDL_Keysym keySym);
#endif
 
    bool _queuedFakeMouseMove;
 
    Common::Event _fakeMouseMove;
 
    bool _staleMousePositionWorkaround = true;
 
public:
    void setStaleMousePositionWorkaround(bool enable) { _staleMousePositionWorkaround = enable; }
    bool getStaleMousePositionWorkaround() const { return _staleMousePositionWorkaround; }
 
protected:
 
    uint8 _lastHatPosition;
 
#if SDL_VERSION_ATLEAST(2, 0, 0)
    bool _queuedFakeKeyUp;
 
    Common::Event _fakeKeyUp;
 
    int _queuedFakeMouseScroll;
 
    Common::Event _fakeMouseScroll;
 
    enum {
        MAX_NUM_FINGERS = 3, // number of fingers to track per panel
        MAX_TAP_TIME = 250, // taps longer than this will not result in mouse click events
        MAX_TAP_MOTION_DISTANCE = 10, // max distance finger motion in Vita screen pixels to be considered a tap
        SIMULATED_CLICK_DURATION = 50, // time in ms how long simulated mouse clicks should be
        FINGER_SUBPIXEL_MULTIPLIER = 16 // multiplier for sub-pixel resolution
    };
 
    struct TouchFinger {
#if SDL_VERSION_ATLEAST(3, 0, 0)
        SDL_FingerID id = 0; // 0: no touch
#else 
        int id = -1; // -1: no touch
#endif
        uint32 timeLastDown = 0;
        int lastX = 0; // last known screen coordinates
        int lastY = 0; // last known screen coordinates
        float lastDownX = 0; // SDL touch coordinates when last pressed down
        float lastDownY = 0; // SDL touch coordinates when last pressed down
    };
 
    enum DraggingType {
        DRAG_NONE = 0,
        DRAG_TWO_FINGER,
        DRAG_THREE_FINGER,
    };
 
    struct TouchPanelState {
        TouchFinger _finger[MAX_NUM_FINGERS]; // keep track of finger status
        DraggingType _multiFingerDragging = DRAG_NONE; // keep track whether we are currently drag-and-dropping
        unsigned int _simulatedClickStartTime[2] = {0, 0}; // initiation time of last simulated left or right click (zero if no click)
        int _hiresDX = 0; // keep track of slow, sub-pixel, finger motion across multiple frames
        int _hiresDY = 0;
        bool _tapMade = false;
    };
 
    Common::HashMap<unsigned long, TouchPanelState> _touchPanels;
 
private:
    void preprocessFingerDown(SDL_Event *event);
    bool preprocessFingerUp(SDL_Event *event, Common::Event *ev);
    void preprocessFingerMotion(SDL_Event *event);
    void finishSimulatedMouseClicks(void);
#endif
};
 
#endif