/*
    * @(#)$Id: WacomUtils.java 689 2009-07-22 00:10:27Z bsigner $
    *
    * Author       :   Croci Michele, mcroci@gmail.com
    *
    * Purpose      :   Provide access to a Wacom Tablet PC.
    *
    * -----------------------------------------------------------------------
    *
   * Revision Information:
   *
   * Date             Who         Reason
   *
   * Nov 14, 2007    crocimi     Initial Release
   *
   * -----------------------------------------------------------------------
   *
   * Copyright 1999-2009 ETH Zurich. All Rights Reserved.
   *
   * This software is the proprietary information of ETH Zurich.
   * Use is subject to license terms.
   * 
   */
  
  
  package org.ximtec.igesture.io.wacom;
  
  import org.ximtec.igesture.io.wacom.Wintab32.LOGCONTEXTW;
  import org.ximtec.igesture.io.wacom.Wintab32.PACKET;
  import org.ximtec.igesture.io.win32.User32;
  import org.ximtec.igesture.io.win32.Win32;
  import org.ximtec.igesture.io.win32.User32.MSG;
  import org.ximtec.igesture.io.win32.W32API.HANDLE;
  import org.ximtec.igesture.io.win32.W32API.HDC;
  import org.ximtec.igesture.io.win32.W32API.HINSTANCE;
  import org.ximtec.igesture.io.win32.W32API.HWND;
  import org.ximtec.igesture.io.win32.W32API.LPARAM;
  import org.ximtec.igesture.io.win32.W32API.LRESULT;
  import org.ximtec.igesture.io.win32.W32API.WPARAM;
  
  import com.sun.jna.ptr.IntByReference;
  import com.sun.jna.win32.StdCallLibrary.StdCallCallback;
  
  public class WacomUtils extends Thread{
  
  	/** Provide access to a Wacom Tablet PC.
  	 * 
  	 * @author Michele Croci
  	 */
  	
  	Wintab32 lib = Win32.WINTAB32_INSTANCE;
  	HDC hdc = new HDC();
  	TabletProc tabletListener;
  	HANDLE handle;
  	HINSTANCE hinst;
  	
  	private WacomCallback wCallback;
  
  	
  	public WacomUtils() {}
  	
      public WacomUtils(WacomCallback wCallback) {
         this.wCallback = wCallback;
      }
  	
  	   
  	   private void init(){
            hinst = Win32.KERNEL32_INSTANCE.GetModuleHandle(null);
  
            tabletListener = new TabletProc() {
  
               public LRESULT callback(int code, WPARAM wParam, LPARAM lParam) {
                  PACKET p = getPacket();
                  if((p!=null)){
                      fireEvent(p);
                  }
                  
                  //discard 2 packets, otherwise too slow!
                  PACKET[] arr = new PACKET[2];
                  getPackets(2, arr);
                 
                  return Win32.USER32_INSTANCE.CallNextHookEx(handle, code, wParam, lParam);
               }
            };
             handle = Win32.USER32_INSTANCE.SetWindowsHookExW(User32.WH_MOUSE_LL, tabletListener, hinst,0);
  	   }
  	   
  	   private void fireEvent(PACKET p){
  	      wCallback.callbackFunction(p.pkX, p.pkY, p.pkZ, p.pkStatus, p.pkNormalPressure, p.pkTangentPressure,
  	             p.pkTime, p.pkOrientation, p.pkRotation, p.pkButtons);
  	   }
  
  
  	    
  	 /**
       * Open session with wacom Tablet PC
       */
  	    public void open() {
  
 	    	HWND hwnd = new HWND();
 	    	hwnd.setPointer(new IntByReference(Wintab32.HWND_BROADCAST).getPointer());//getPointer(0)
 	    	int packetmode = 0;
 	    	
 	    	LOGCONTEXTW lg =  new LOGCONTEXTW();
 	    	lib.WTInfoW(Wintab32.WTI_DEFSYSCTX, 0, lg);
 	    	lg.lcPktMode= packetmode;
 	    	//information to be retrieved, see wintab.h for values
 	    	lg.lcPktData = 0x3FFF;
 	    	lg.lcMoveMask = 0x3FFF; //0x180
 	    	lg.lcBtnUpMask = lg.lcBtnDnMask;
 
 	        hdc=lib.WTOpenW(hwnd, lg, true);
 	      //  lib.WacomDoSpecialContextHandling(true);
 	    }
 	    
 	    /**
 	     * Close session with wacom Tablet PC
 	     */
 	    public void close() {
 	    	lib.WTClose(hdc);
 	    	lib.WacomDoSpecialContextHandling(false);
 	    }
 	    
 	    
 	    /**
 	     * Get single packet
 	     * 
 	     * @return the packet (saved in an array)
 	     */
 	    public PACKET getPacket(){
 	    	if (hdc == null)
 	    		return null;
 	    	
 	    	PACKET p = new PACKET();
 	    	lib.WTPacketsGet(hdc, 1,p);
 	    	return p;
 
 	    } 
 	    
 	    /**
          * Get single packet, discard 3
          * 
          * @return the packet (saved in an array)
          */
         public PACKET getOnePacket(){
            PACKET[] arr = new PACKET[10];
            if (hdc == null)
               return null;
           
           PACKET p = new PACKET();
           lib.WTPacketsGet(hdc, 1,p);
           lib.WTPacketsGet(hdc, 3,arr);//discard 3 packets
           return p;
 
         } 
 	    
 	    /**
          * Get n packets
          * 
          * @param number
          *      the maximal number of packets to be retrieved
          * 
          * @param arr
          *      the array where packets have to be saved
          * 
          * @return the received packets
          */
 	    
 	    public int getPackets(int number, PACKET[] arr){
 	    	if (hdc == null)
 	    		return -1;
 
 	    	int ret = lib.WTPacketsGet(hdc, number,arr);
 	    	return ret;
 	    } 
 	    
 	    
 	    public interface TabletProc extends StdCallCallback {
 
 	       LRESULT callback(int code, WPARAM wParam, LPARAM lParam);
 	    }
 
 	    
 	    /**
          * Register callback function
          */
 	    private void registerHook(){
 	       handle = Win32.USER32_INSTANCE.SetWindowsHookExW(User32.WH_KEYBOARD_LL, tabletListener, hinst, 0); 
 	    }
 	    
 	    
         /**
          * Run method
          */
 	    public void run(){
 
 	          init();
 	     
 	          registerHook();
 	          open();
 	           MSG msg = new MSG();
 	           while(Win32.USER32_INSTANCE.GetMessageW(msg,null,0,0)!=0){
 	               //User32.INSTANCE.DispatchMessage(msg);
 	           }
 	       close();
 	   }
 	    
 	     /**
          * Determine if a particular type of data can be retrieved or not
          * 
          * @param datatype
          *      the type representing the data
          * 
          * @return true if the data is supported, false otherwise
          */
 	    
 	    public boolean isDataSupported(int dataTypeId){
 	    	int test;
 	    	HWND hwnd = new HWND();
 	    	hwnd.setPointer(new IntByReference(Wintab32.HWND_BROADCAST).getPointer());//getPointer(0)
 	    	
 	    	LOGCONTEXTW lg =  new LOGCONTEXTW();
 	    	
 	    	test = lib.WTInfoW(Wintab32.WTI_DEVICES, dataTypeId, lg);
 	    	return test!=0;
 	    }
 	    
 	    
 	    //data types
 		public static final int DVC_X			= 	12;
 		public static final int DVC_Y			=	13;
 		public static final int DVC_Z			=	14;
 		public static final int DVC_NPRESSURE	=	15;
 		public static final int DVC_TPRESSURE	=	16;
 		public static final int DVC_ORIENTATION	=	17;
 		public static final int DVC_ROTATION	=	18; /* 1.1 */
 		
 	}