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Java > Open Source Codes > rcm > util > Win


1 /*
2  * Copyright (c) 1998-2002 Carnegie Mellon University. All rights
3  * reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions
7  * are met:
8  *
9  * 1. Redistributions of source code must retain the above copyright
10  * notice, this list of conditions and the following disclaimer.
11  *
12  * 2. Redistributions in binary form must reproduce the above copyright
13  * notice, this list of conditions and the following disclaimer in
14  * the documentation and/or other materials provided with the
15  * distribution.
16  *
17  * THIS SOFTWARE IS PROVIDED BY CARNEGIE MELLON UNIVERSITY ``AS IS'' AND
18  * ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
19  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
20  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY
21  * NOR ITS EMPLOYEES BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
22  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
23  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
27  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28  *
29  */
30
31 package rcm.util;
32
33 import java.awt.*;
34
35 public abstract class Win {
36     public static void center (Window window, Component ref) {
37         position (window, ref, 0.5, 0.5);
38     }
39
40     public static void position (Window frame, Component ref,
41                                  double xfrac, double yfrac) {
42         Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
43         Dimension size = frame.getSize();
44         Dimension refSize = (ref != null)
45             ? ref.getSize()
46             : screenSize;
47         Point origin = (ref != null)
48             ? ref.getLocationOnScreen ()
49             : new Point (0, 0);
50
51         int x = origin.x + relativePoint (xfrac, refSize.width, size.width);
52         int y = origin.y + relativePoint (yfrac, refSize.height, size.height);
53
54         // make sure frame is entirely on screen
55 x = Math.max (0, Math.min (screenSize.width - size.width, x));
56         y = Math.max (0, Math.min (screenSize.height - size.height, y));
57         
58         frame.setLocation (x, y);
59     }
60
61     static int relativePoint (double frac, int parentLength, int childLength) {
62         if (frac < 0)
63             return (int) (frac * childLength);
64         else if (frac > 1)
65             return (int) (parentLength + (frac - 2) * childLength);
66         else
67             return (int) (frac * (parentLength - childLength));
68     }
69
70
71     public static Frame findFrame (Component comp) {
72         for (; comp!=null; comp = comp.getParent ())
73             if (comp instanceof Frame) {
74                 return (Frame)comp;
75             }
76         return null;
77     }
78
79     public static Frame findFrameOrMakeFrame (Component parent) {
80         return (parent != null) ? findFrame (parent) : new Frame ();
81     }
82         
83
84 }
85
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