import java.awt.*;
import java.io.*;

import com.ms.wfc.ole32.*;
import com.ms.wfc.win32.*;
import com.ms.wfc.app.*;
import com.ms.wfc.ui.Metafile;
import com.ms.win32.*;
import com.ms.com.*;

import com.ms.awt.GraphicsX;

/**
 * This class exposes a static method that allows you to paste
 * any awt heavyweight component to the clpboard as a metafile,
 * If used with swing, you must pass in a JFrame or JApplet,
 *
 * It needs a separate thread due to the fact that ole hangs if the
 * current thread is blocked - the thread ends when you paste!
 */
public class ClipPaster implements IDataObject, Serializable, Runnable 
{
  Component c;

  /**
   * This static method allows you to paste
   * any awt heavyweight component to the clpboard as a metafile,
   * If used with swing, you must pass in a JFrame or JApplet.
   */
  public static void pasteToClipboard(Component c)
  {
    ClipPaster clip = new ClipPaster(c);
    (new Thread(clip)).start();
  }
  
  public void run()
  {
    Clipboard.setDataObject(this);
    MSG msg = new MSG();
    // must dispatch win32 messages until getData is called
    while (User32.GetMessage(msg, 0, 0, 0)) {
        User32.DispatchMessage(msg);
    }
    // this loop breaks when getData is called - need to add a timer
    //System.out.println("run exited");
  }

  // this is not created by users - use pasteToClipboard(Component)
  public ClipPaster(Component comp)
  {
    c = comp;
  }

  // component MUST be a heavyweight component!
  protected int getMetaFile()
  {
    // in memory metafile to pass in data object
    int mfInt = Gdi32.CreateEnhMetaFile(0, null, null, null);
    // this is a Graphics object on an hDC
    GraphicsX g = new GraphicsX(mfInt);
    // this causes the component to draw its kids to the metafile
    c.printAll(g);
    // close and obtain a handle
    int hMF = Gdi32.CloseEnhMetaFile(mfInt);
    // must disconnect the graphics object from the hDC
    g.dispose();
    // return the handle - Clipboard will delete
    return hMF;
  }

  // start IDataObject implementation
  public boolean getDataPresent(String s)
  {
    if (s.equals(DataFormats.CF_ENHMETAFILE)) return true;
    return false;
  }

  public boolean getDataPresent(Class c)
  {
    if (c.equals(Metafile.class)) return true;
    return false;
  }

  public Object getData(String s)
  {
    //System.out.println("getData");
    try {
      if (s.equals(DataFormats.CF_ENHMETAFILE)) {
        return new Metafile(getMetaFile());
      }
    }
    finally {
      // exit the thread
      User32.PostQuitMessage(0);
    }
    return null;
  }

  public Object getData(Class c)
  {
    if (c.equals(Metafile.class)) {
      return getData(DataFormats.CF_ENHMETAFILE);
    }
    return null;
  }

  public void setData(String s, Object o) {}

  public void setData(Class c, Object o) {}

  public void setData(Object o) {}

  public String[] getFormats()
  {
    //System.out.println("getFormats");
    return new String[] { DataFormats.CF_ENHMETAFILE };
  }
  // end IDataObject implementation

  /**
   * to run this, run the class in jview, go to excel or word and
   * just hit ^V (paste)  - The line: ClipPaster.pasteToClipboard(f)
   * is the one that you should use in other apps.
   */
  public static void main(String[] args)
  {
    Frame f = new Frame("test");
    Button b = new Button("Hello World");
    f.setLayout(new FlowLayout());
    f.add(b);
    f.pack();
    f.show();
    ClipPaster.pasteToClipboard(f);
  }
}