/**************************************************************************
/* This class provides some useful functions for manipulating windows.
/*
/* Copyright (c) 2003-2004 by Bernhard Bablok (mail@bablokb.de)
/*
/* This library is free software; you can redistribute it and/or modify
/* it under the terms of the GNU Lesser General Public License as published
/* by  the Free Software Foundation; either version 2 of the License or
/* (at your option) any later version.
/*
/* This library 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 Lesser General Public License for more details.
/*
/* You should have received a copy of the GNU Lesser General Public License
/* along with this library; see the file COPYING.LESSER.  If not, write to
/* the Free Software Foundation Inc., 59 Temple Place - Suite 330,
/* Boston, MA  02111-1307 USA
/**************************************************************************/

package de.bablokb.luala.lib.gui;

import java.awt.*;
import java.util.*;

/**
   This class provides some useful functions for manipulating windows.

   <p>This class was originally part of the bbutils-package.

   @version $Revision: 1.5 $
   @author  $Author: bablokb $
*/

public class WindowHelper {

  //////////////////////////////////////////////////////////////////////////////

  /**
     Center given window on its parent. If the parent is malpositioned, display
     the window at position (10,10).

     @param w The window
  */

  public static void center(Container w) {
    Container parent = w.getParent();
    Rectangle parentRect;
    if (parent == null) 
      parentRect = new Rectangle(Toolkit.getDefaultToolkit().getScreenSize());
    else
      parentRect = parent.getBounds();
    Rectangle windowRect = w.getBounds();
    Point upperLeft = new Point(parentRect.x + (parentRect.width/2) -
                                (windowRect.width/2),
                                parentRect.y + (parentRect.height/2)  -
                                (windowRect.height/2));
    if (upperLeft.x <= 0)
      upperLeft.x = parentRect.x/2;
    if (upperLeft.x <= 0)
      upperLeft.x = 10;
    if (upperLeft.y <= 0)
      upperLeft.y = parentRect.y/2;
    if (upperLeft.y <= 0)
      upperLeft.y = 10;
    w.setLocation(upperLeft);
  }

  //////////////////////////////////////////////////////////////////////////////

  /**
     Set the location from attributes in the system properties.
     Needed properties are prefix.x, prefix.y, prefix.width, prefix.height

     @param w      The window
     @param prefix Prefix string in properties file
  */

  public static void setLocation(Window w, String prefix) {
    int x,y,wi,h;
    try {
      x = Integer.getInteger(prefix+".x").intValue();
      y = Integer.getInteger(prefix+".y").intValue();
      wi = Integer.getInteger(prefix+".width").intValue();
      h = Integer.getInteger(prefix+".height").intValue();
      w.setLocation(x,y);
      w.setSize(wi,h);
    } catch (Exception e) {
      w.pack();
      center(w);
    }
  }

  //////////////////////////////////////////////////////////////////////////////

  /**
     Save the location of the window position in a Properties object.

     @param w      The window
     @param prefix Prefix string in properties file
  */

  public static void saveLocation(Window w,String prefix) {
    Point loc = w.getLocation();
    Dimension size = w.getSize();
    Properties props = System.getProperties();
    props.put(prefix+".x",String.valueOf(loc.x));
    props.put(prefix+".y",String.valueOf(loc.y));
    props.put(prefix+".width",String.valueOf(size.width));
    props.put(prefix+".height",String.valueOf(size.height));
  }
}