Source Code Cross Referenced for Listhead.java in  » Ajax » zk » org » zkoss » zul » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Ajax » zk » org.zkoss.zul 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


01:        /* Listhead.java
02:
03:        {{IS_NOTE
04:        	Purpose:
05:        		
06:        	Description:
07:        		
08:        	History:
09:        		Fri Aug  5 13:06:38     2005, Created by tomyeh
10:        }}IS_NOTE
11:
12:        Copyright (C) 2005 Potix Corporation. All Rights Reserved.
13:
14:        {{IS_RIGHT
15:        	This program is distributed under GPL Version 2.0 in the hope that
16:        	it will be useful, but WITHOUT ANY WARRANTY.
17:        }}IS_RIGHT
18:         */
19:        package org.zkoss.zul;
20:
21:        import org.zkoss.zk.ui.Component;
22:        import org.zkoss.zk.ui.UiException;
23:
24:        import org.zkoss.zul.impl.HeadersElement;
25:
26:        /**
27:         * A list headers used to define multi-columns and/or headers.
28:         *
29:         * <p>Difference from XUL:
30:         * <ol>
31:         * <li>There is no listcols in ZUL because it is merged into {@link Listhead}.
32:         * Reason: easier to write Listbox.</li>
33:         * </ol>
34:         *
35:         * @author tomyeh
36:         */
37:        public class Listhead extends HeadersElement {
38:            /** Returns the list box that it belongs to.
39:             * <p>It is the same as {@link #getParent}.
40:             */
41:            public Listbox getListbox() {
42:                return (Listbox) getParent();
43:            }
44:
45:            public boolean setVisible(boolean visible) {
46:                final boolean vis = super .setVisible(visible);
47:                final Listbox listbox = getListbox();
48:                if (listbox != null)
49:                    listbox.invalidate();
50:                return vis;
51:            }
52:
53:            //-- Component --//
54:            public void setParent(Component parent) {
55:                if (parent != null && !(parent instanceof  Listbox))
56:                    throw new UiException("Wrong parent: " + parent);
57:                super .setParent(parent);
58:            }
59:
60:            public boolean insertBefore(Component child, Component insertBefore) {
61:                if (!(child instanceof  Listheader))
62:                    throw new UiException("Unsupported child for listhead: "
63:                            + child);
64:                return super.insertBefore(child, insertBefore);
65:            }
66:        }
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