/*
    * @(#)$Id: MouseUtils.java 689 2009-07-22 00:10:27Z bsigner $
    *
    * Author       :   Croci Michele, mcroci@gmail.com
    *
    * Purpose      :  Provide access to API for managing a mouse
    *
    * -----------------------------------------------------------------------
    *
   * 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.mouse;
  
  import java.util.EnumSet;
  
  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.User32.POINT;
  import org.ximtec.igesture.io.win32.W32API.HANDLE;
  import org.ximtec.igesture.io.win32.W32API.HINSTANCE;
  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.win32.StdCallLibrary.StdCallCallback;
  
  
  /**
   * 
   * @author Michele Croci, mcroci@gmail.com
   * @author Ueli Kurmann, ueli.kurmann@bbv.ch
   * @version 1.0
   */
  public class MouseUtils implements Runnable {
  
     private static final User32 USER32 = Win32.USER32_INSTANCE;
     
     private HINSTANCE hinst;
     private MouseProc mouseListener;
     private HANDLE handle;
  
     private final MouseHandler mouseCallback;
  
     public enum MouseButton {
        LEFT(0x01), RIGHT(0X02), MIDDLE(0X04);
  
        private int buttonId;
  
  
        private MouseButton(int i) {
           this.buttonId = i;
        }
  
  
        public int getButtonId() {
           return buttonId;
        }
     }
  
  
     public MouseUtils(MouseHandler mouseCallback) {
        this.mouseCallback = mouseCallback;     
     }
  
  
     /**
      * Initialization
      */
     public void init() {
        hinst = Win32.KERNEL32_INSTANCE.GetModuleHandle(null);
        mouseListener = new MouseProc() {
  
           public LRESULT callback(int code, WPARAM wParam, LPARAM lParam) {
  
              POINT p = new POINT();
              USER32.GetCursorPos(p);
  
              EnumSet<MouseButton> buttons = EnumSet.noneOf(MouseButton.class);
              for (MouseButton button : MouseButton.values()) {
                 if (USER32.GetAsyncKeyState(button.buttonId)) {
                    buttons.add(button);
                 }
              }
              
             mouseCallback.handleMouseEvent(p.x, p.y, buttons);
 
             return USER32.CallNextHookEx(handle, code, wParam, lParam);
          }
       };
       handle = USER32.SetWindowsHookExW(User32.WH_MOUSE_LL, mouseListener,
             hinst, 0);
    }
 
 
   
    /**
     * Finalize thread
     */
    public interface MouseProc extends StdCallCallback {
 
       LRESULT callback(int code, WPARAM wParam, LPARAM lParam);
    }
 
    /*
     * (non-Javadoc)
     * @see java.lang.Runnable#run()
     */
    @Override
    public void run() {
       init();
       registerHook();
       MSG msg = new MSG();
       while ((USER32.GetMessageW(msg, null, 0, 0) != 0)) {
          
       }
    }
 
    /**
     * Register callback function
     */
    public void registerHook() {
       handle = USER32.SetWindowsHookExW(User32.WH_KEYBOARD_LL, mouseListener,
             hinst, 0);
    }
 
 
    /**
     * Unregister callback function
     */
    public void unregisterHook() {
       USER32.UnhookWindowsHookExW(handle);
    }
    
    /**
     * Finalize thread
     */
    protected void finalize() throws Throwable {
       unregisterHook();
       super.finalize();
    }
 
 
 }