1 /*
2  * Copyright (c) 1998, 2004, Oracle and/or its affiliates. All rights reserved.
3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4  *
5  * This code is free software; you can redistribute it and/or modify it
6  * under the terms of the GNU General Public License version 2 only, as
7  * published by the Free Software Foundation.  Oracle designates this
8  * particular file as subject to the "Classpath" exception as provided
9  * by Oracle in the LICENSE file that accompanied this code.
10  *
11  * This code is distributed in the hope that it will be useful, but WITHOUT
12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
14  * version 2 for more details (a copy is included in the LICENSE file that
15  * accompanied this code).
16  *
17  * You should have received a copy of the GNU General Public License version
18  * 2 along with this work; if not, write to the Free Software Foundation,
19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20  *
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22  * or visit www.oracle.com if you need additional information or have any
23  * questions.
24  */
25 package javax.swing.text.html;
26 
27 import java.awt.*;
28 import java.awt.event.*;
29 import java.io.*;
30 import java.net.MalformedURLException;
31 import java.net.URL;
32 import javax.swing.text.*;
33 import javax.swing.*;
34 import javax.swing.border.*;
35 import javax.swing.event.*;
36 import java.util.*;
37 
38 /**
39  * EditableView sets the view it contains to be visible only when the
40  * JTextComponent the view is contained in is editable. The min/pref/max
41  * size is 0 when not visible.
42  *
43  * @author  Scott Violet
44  */
45 class EditableView extends ComponentView {
46 
EditableView(Element e)47     EditableView(Element e) {
48         super(e);
49     }
50 
getMinimumSpan(int axis)51     public float getMinimumSpan(int axis) {
52         if (isVisible) {
53             return super.getMinimumSpan(axis);
54         }
55         return 0;
56     }
57 
getPreferredSpan(int axis)58     public float getPreferredSpan(int axis) {
59         if (isVisible) {
60             return super.getPreferredSpan(axis);
61         }
62         return 0;
63     }
64 
getMaximumSpan(int axis)65     public float getMaximumSpan(int axis) {
66         if (isVisible) {
67             return super.getMaximumSpan(axis);
68         }
69         return 0;
70     }
71 
paint(Graphics g, Shape allocation)72     public void paint(Graphics g, Shape allocation) {
73         Component c = getComponent();
74         Container host = getContainer();
75 
76         if (host instanceof JTextComponent &&
77             isVisible != ((JTextComponent)host).isEditable()) {
78             isVisible = ((JTextComponent)host).isEditable();
79             preferenceChanged(null, true, true);
80             host.repaint();
81         }
82         /*
83          * Note: we cannot tweak the visible state of the
84          * component in createComponent() even though it
85          * gets called after the setParent() call where
86          * the value of the boolean is set.  This
87          * because, the setComponentParent() in the
88          * superclass, always does a setVisible(false)
89          * after calling createComponent().   We therefore
90          * use this flag in the paint() method to
91          * setVisible() to true if required.
92          */
93         if (isVisible) {
94             super.paint(g, allocation);
95         }
96         else {
97             setSize(0, 0);
98         }
99         if (c != null) {
100             c.setFocusable(isVisible);
101         }
102     }
103 
setParent(View parent)104     public void setParent(View parent) {
105         if (parent != null) {
106             Container host = parent.getContainer();
107             if (host != null) {
108                 if (host instanceof JTextComponent) {
109                     isVisible = ((JTextComponent)host).isEditable();
110                 } else {
111                     isVisible = false;
112                 }
113             }
114         }
115         super.setParent(parent);
116     }
117 
118     /**
119      * @return true if the Component is visible.
120      */
isVisible()121     public boolean isVisible() {
122         return isVisible;
123     }
124 
125     /** Set to true if the component is visible. This is based off the
126      * editability of the container. */
127     private boolean isVisible;
128 } // End of EditableView
129