sdl_quartzevents.m

SDL库 在进行视频显示程序spcaview安装时必须的库文件

        unsigned int currentMask, newMask;

        currentMask = current_mods & bit;
        newMask     = newMods & bit;

        if ( currentMask &&
             currentMask != newMask ) {     /* modifier up event */

             key.sym = mapping[i];
             /* If this was Caps Lock, we need some additional voodoo to make SDL happy */
             if (bit == NSAlphaShiftKeyMask)
                  SDL_PrivateKeyboard (SDL_PRESSED, &key);
             SDL_PrivateKeyboard (SDL_RELEASED, &key);
        }
        else if ( newMask &&
                  currentMask != newMask ) {     /* modifier down event */
        
             key.sym = mapping[i];
             SDL_PrivateKeyboard (SDL_PRESSED, &key);
             /* If this was Caps Lock, we need some additional voodoo to make SDL happy */
             if (bit == NSAlphaShiftKeyMask)
                  SDL_PrivateKeyboard (SDL_RELEASED, &key);
        }
    }
}

/* This is a helper function for QZ_HandleModifierSide. This 
 * function reverts back to behavior before the distinction between
 * sides was made.
 */
static void QZ_HandleNonDeviceModifier ( _THIS, unsigned int device_independent_mask, unsigned int newMods, unsigned int key_sym) {
    unsigned int currentMask, newMask;
    SDL_keysym key;
    
    key.scancode    = 0;
    key.sym         = key_sym;
    key.unicode     = 0;
    key.mod         = KMOD_NONE;
    
    /* Isolate just the bits we care about in the depedent bits so we can 
     * figure out what changed
     */ 
    currentMask = current_mods & device_independent_mask;
    newMask     = newMods & device_independent_mask;
    
    if ( currentMask &&
         currentMask != newMask ) {     /* modifier up event */
         SDL_PrivateKeyboard (SDL_RELEASED, &key);
    }
    else if ( newMask &&
          currentMask != newMask ) {     /* modifier down event */
          SDL_PrivateKeyboard (SDL_PRESSED, &key);
    }
}

/* This is a helper function for QZ_HandleModifierSide. 
 * This function sets the actual SDL_PrivateKeyboard event.
 */
static void QZ_HandleModifierOneSide ( _THIS, unsigned int newMods,
                                       unsigned int key_sym, 
                                       unsigned int sided_device_dependent_mask ) {
    
    SDL_keysym key;
    unsigned int current_dep_mask, new_dep_mask;
    
    key.scancode    = 0;
    key.sym         = key_sym;
    key.unicode     = 0;
    key.mod         = KMOD_NONE;
    
    /* Isolate just the bits we care about in the depedent bits so we can 
     * figure out what changed
     */ 
    current_dep_mask = current_mods & sided_device_dependent_mask;
    new_dep_mask     = newMods & sided_device_dependent_mask;
    
    /* We now know that this side bit flipped. But we don't know if
     * it went pressed to released or released to pressed, so we must 
     * find out which it is.
     */
    if( new_dep_mask &&
        current_dep_mask != new_dep_mask ) { 
        /* Modifier down event */
        SDL_PrivateKeyboard (SDL_PRESSED, &key);
    }
    else /* Modifier up event */ {
        SDL_PrivateKeyboard (SDL_RELEASED, &key);
    }
}

/* This is a helper function for QZ_DoSidedModifiers.
 * This function will figure out if the modifier key is the left or right side, 
 * e.g. left-shift vs right-shift. 
 */
static void QZ_HandleModifierSide ( _THIS, int device_independent_mask, 
                                    unsigned int newMods, 
                                    unsigned int left_key_sym, 
                                    unsigned int right_key_sym,
                                    unsigned int left_device_dependent_mask, 
                                    unsigned int right_device_dependent_mask ) {
    unsigned int device_dependent_mask = 0;
    unsigned int diff_mod = 0;
    
    device_dependent_mask = left_device_dependent_mask | right_device_dependent_mask;
    /* On the basis that the device independent mask is set, but there are 
     * no device dependent flags set, we'll assume that we can't detect this 
     * keyboard and revert to the unsided behavior.
     */
    if ( (device_dependent_mask & newMods) == 0 ) {
        /* Revert to the old behavior */
        QZ_HandleNonDeviceModifier ( this, device_independent_mask, newMods, left_key_sym );
        return;
    }
        
    /* XOR the previous state against the new state to see if there's a change */
    diff_mod = (device_dependent_mask & current_mods)
        ^ (device_dependent_mask & newMods);

    if ( diff_mod ) {
        /* A change in state was found. Isolate the left and right bits 
         * to handle them separately just in case the values can simulataneously
         * change or if the bits don't both exist.
         */
        if ( left_device_dependent_mask & diff_mod ) {
            QZ_HandleModifierOneSide ( this, newMods, left_key_sym, left_device_dependent_mask );
        }
        if ( right_device_dependent_mask & diff_mod ) {
            QZ_HandleModifierOneSide ( this, newMods, right_key_sym, right_device_dependent_mask );
        }
    }
}
   
/* This is a helper function for QZ_DoSidedModifiers.
 * This function will release a key press in the case that 
 * it is clear that the modifier has been released (i.e. one side 
 * can't still be down).
 */
static void QZ_ReleaseModifierSide ( _THIS, 
                                     unsigned int device_independent_mask, 
                                     unsigned int newMods,
                                     unsigned int left_key_sym, 
                                     unsigned int right_key_sym,
                                     unsigned int left_device_dependent_mask, 
                                     unsigned int right_device_dependent_mask ) {
    unsigned int device_dependent_mask = 0;
    SDL_keysym key;
    
    key.scancode    = 0;
    key.sym         = SDLK_UNKNOWN;
    key.unicode     = 0;
    key.mod         = KMOD_NONE;
    
    device_dependent_mask = left_device_dependent_mask | right_device_dependent_mask;
    /* On the basis that the device independent mask is set, but there are 
     * no device dependent flags set, we'll assume that we can't detect this 
     * keyboard and revert to the unsided behavior.
     */
    if ( (device_dependent_mask & current_mods) == 0 ) {
        /* In this case, we can't detect the keyboard, so use the left side 
         * to represent both, and release it. 
         */
        key.sym = left_key_sym;
        SDL_PrivateKeyboard (SDL_RELEASED, &key);

        return;
    }
        
        
    /* 
     * This could have been done in an if-else case because at this point,
     * we know that all keys have been released when calling this function. 
     * But I'm being paranoid so I want to handle each separately,
     * so I hope this doesn't cause other problems.
     */
    if ( left_device_dependent_mask & current_mods ) {
        key.sym = left_key_sym;
        SDL_PrivateKeyboard (SDL_RELEASED, &key);
    }
    if ( right_device_dependent_mask & current_mods ) {
        key.sym = right_key_sym;
        SDL_PrivateKeyboard (SDL_RELEASED, &key);
    }
}

/* This is a helper function for QZ_DoSidedModifiers.
 * This function handles the CapsLock case.
 */
static void QZ_HandleCapsLock (_THIS, unsigned int newMods) {
    unsigned int currentMask, newMask;
    SDL_keysym key;
    
    key.scancode    = 0;
    key.sym         = SDLK_CAPSLOCK;
    key.unicode     = 0;
    key.mod         = KMOD_NONE;
    
    currentMask = current_mods & NSAlphaShiftKeyMask;
    newMask     = newMods & NSAlphaShiftKeyMask;

    if ( currentMask &&
         currentMask != newMask ) {     /* modifier up event */
         /* If this was Caps Lock, we need some additional voodoo to make SDL happy */
         SDL_PrivateKeyboard (SDL_PRESSED, &key);
         SDL_PrivateKeyboard (SDL_RELEASED, &key);
    }
    else if ( newMask &&
              currentMask != newMask ) {     /* modifier down event */
        /* If this was Caps Lock, we need some additional voodoo to make SDL happy */
        SDL_PrivateKeyboard (SDL_PRESSED, &key);
        SDL_PrivateKeyboard (SDL_RELEASED, &key);
    }
}

/* This function will handle the modifier keys and also determine the 
 * correct side of the key.
 */
static void QZ_DoSidedModifiers (_THIS, unsigned int newMods) {
	/* Set up arrays for the key syms for the left and right side. */
    const unsigned int left_mapping[]  = { SDLK_LSHIFT, SDLK_LCTRL, SDLK_LALT, SDLK_LMETA };
    const unsigned int right_mapping[] = { SDLK_RSHIFT, SDLK_RCTRL, SDLK_RALT, SDLK_RMETA };
	/* Set up arrays for the device dependent masks with indices that 
     * correspond to the _mapping arrays 
     */
    const unsigned int left_device_mapping[]  = { NX_DEVICELSHIFTKEYMASK, NX_DEVICELCTLKEYMASK, NX_DEVICELALTKEYMASK, NX_DEVICELCMDKEYMASK };
    const unsigned int right_device_mapping[] = { NX_DEVICERSHIFTKEYMASK, NX_DEVICERCTLKEYMASK, NX_DEVICERALTKEYMASK, NX_DEVICERCMDKEYMASK };

    unsigned int i;
    unsigned int bit;
    
    /* Handle CAPSLOCK separately because it doesn't have a left/right side */
    QZ_HandleCapsLock ( this, newMods );
        
    /* Iterate through the bits, testing each against the current modifiers */
    for (i = 0, bit = NSShiftKeyMask; bit <= NSCommandKeyMask; bit <<= 1, ++i) {
		
        unsigned int currentMask, newMask;
		
        currentMask = current_mods & bit;
        newMask     = newMods & bit;
		
        /* If the bit is set, we must always examine it because the left
         * and right side keys may alternate or both may be pressed.
         */
        if ( newMask ) {
            QZ_HandleModifierSide ( this, bit, newMods, 
                                       left_mapping[i],
                                       right_mapping[i],
                                       left_device_mapping[i],
                                       right_device_mapping[i] );
        }
        /* If the state changed from pressed to unpressed, we must examine
            * the device dependent bits to release the correct keys.
            */
        else if ( currentMask &&
                  currentMask != newMask ) { /* modifier up event */
                  QZ_ReleaseModifierSide ( this, bit, newMods,
                                           left_mapping[i],
                                           right_mapping[i],
                                           left_device_mapping[i],
                                           right_device_mapping[i] );
        }
    }
}

/* This function is called to handle the modifiers.
 * It will try to distinguish between the left side and right side 
 * of the keyboard for those modifiers that qualify if the 
 * operating system version supports it. Otherwise, the code 
 * will not try to make the distinction.
 */
static void QZ_DoModifiers (_THIS, unsigned int newMods) {
	
    if (current_mods == newMods)
    	return;
    
    /* 
     * Starting with Panther (10.3.0), the ability to distinguish between 
     * left side and right side modifiers is available.
     */
    if( system_version >= 0x1030 ) {
        QZ_DoSidedModifiers (this, newMods);
    }
    else {
        QZ_DoUnsidedModifiers (this, newMods);
    }
    
    current_mods = newMods;
}

static void QZ_GetMouseLocation (_THIS, NSPoint *p) {
    *p = [ NSEvent mouseLocation ]; /* global coordinates */
    if (qz_window)
        QZ_PrivateGlobalToLocal (this, p);
    QZ_PrivateCocoaToSDL (this, p);
}

void QZ_DoActivate (_THIS) {

    SDL_PrivateAppActive (1, SDL_APPINPUTFOCUS | (QZ_IsMouseInWindow (this) ? SDL_APPMOUSEFOCUS : 0));

    QZ_UpdateCursor(this);

    /* Regrab input, only if it was previously grabbed */
    if ( current_grab_mode == SDL_GRAB_ON ) {
        
        /* Restore cursor location if input was grabbed */
        QZ_PrivateWarpCursor (this, cursor_loc.x, cursor_loc.y);
        QZ_ChangeGrabState (this, QZ_ENABLE_GRAB);
    }
    else {
        /* Update SDL's mouse location */
        NSPoint p;
        QZ_GetMouseLocation (this, &p);
        SDL_PrivateMouseMotion (0, 0, p.x, p.y);
    }
}

void QZ_DoDeactivate (_THIS) {
    
    SDL_PrivateAppActive (0, SDL_APPINPUTFOCUS | SDL_APPMOUSEFOCUS);

    /* Get the current cursor location, for restore on activate */
    QZ_GetMouseLocation (this, &cursor_loc);
    
    /* Reassociate mouse and cursor */
    CGAssociateMouseAndMouseCursorPosition (1);

    QZ_UpdateCursor(this);