1 /*
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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
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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
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19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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24  */
25 
26 package sun.awt.X11;
27 
28 import java.awt.*;
29 import java.awt.peer.*;
30 
31 class XLabelPeer extends XComponentPeer implements LabelPeer {
32     /**
33      * Create the label
34      */
35 
36     static final int            TEXT_XPAD = 8;
37     static final int            TEXT_YPAD = 6;
38     String label;
39     int alignment;
40 
41     FontMetrics cachedFontMetrics;
42     Font oldfont;
43 
getFontMetrics()44     FontMetrics getFontMetrics()
45     {
46         if (cachedFontMetrics != null)
47             return cachedFontMetrics;
48         else return getFontMetrics(getPeerFont());
49 
50     }
51 
preInit(XCreateWindowParams params)52     void preInit(XCreateWindowParams params) {
53         super.preInit(params);
54         Label target = (Label) this.target;
55         label = target.getText();
56         if (label == null) {
57             label = "";
58         }
59         alignment = target.getAlignment();
60     }
61 
XLabelPeer(Label target)62     XLabelPeer(Label target) {
63         super(target);
64     }
65 
66     /**
67      * Minimum size.
68      */
getMinimumSize()69     public Dimension getMinimumSize() {
70         FontMetrics fm = getFontMetrics();
71         int w;
72         try {
73             w = fm.stringWidth(label);
74         }
75         catch (NullPointerException e) {
76             w = 0;
77         }
78         return new Dimension(w + TEXT_XPAD,
79                              fm.getAscent() + fm.getMaxDescent() + TEXT_YPAD);
80     }
81 
82 
83     /**
84      * Paint the label
85      */
86     // NOTE: This method is called by privileged threads.
87     //       DO NOT INVOKE CLIENT CODE ON THIS THREAD!
88     @Override
paintPeer(final Graphics g)89     void paintPeer(final Graphics g) {
90         int textX = 0;
91         int textY = 0;
92         g.setColor(getPeerBackground());
93         g.fillRect(0, 0, width, height);
94 
95         Font f = getPeerFont();
96         g.setFont(f);
97         FontMetrics fm = g.getFontMetrics();
98 
99         if (cachedFontMetrics == null)
100         {
101             cachedFontMetrics = fm;
102         }
103         else
104         {
105             if (oldfont != f)
106                 cachedFontMetrics = fm;
107         }
108 
109         switch (alignment) {
110           case Label.LEFT:
111               textX = 2;
112               textY = (height + fm.getMaxAscent() - fm.getMaxDescent()) / 2;
113               break;
114           case Label.RIGHT:
115               textX = width - (fm.stringWidth(label) + 2);
116               textY = (height + fm.getMaxAscent() - fm.getMaxDescent()) / 2;
117               break;
118           case Label.CENTER:
119               textX = (width - fm.stringWidth(label)) / 2;
120               textY = (height + fm.getMaxAscent() - fm.getMaxDescent()) / 2;
121               break;
122         }
123         if (isEnabled()) {
124             g.setColor(getPeerForeground());
125             g.drawString(label, textX, textY);
126         }
127         else {
128             g.setColor(getPeerBackground().brighter());
129             g.drawString(label, textX, textY);
130             g.setColor(getPeerBackground().darker());
131             g.drawString(label, textX - 1, textY - 1);
132         }
133     }
134 
135     @Override
setText(String label)136     public void setText(String label) {
137         if (label == null) {
138             label = "";
139         }
140         if (!label.equals(this.label)) {
141             this.label = label;
142             repaint();
143         }
144     }
145 
146     @Override
setAlignment(final int alignment)147     public void setAlignment(final int alignment) {
148         if (this.alignment != alignment) {
149             this.alignment = alignment;
150             repaint();
151         }
152     }
153 }
154