1 /*

     2  * Copyright 2002-2003 Sun Microsystems, Inc.  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.  Sun designates this

     8  * particular file as subject to the "Classpath" exception as provided

     9  * by Sun 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  *

    21  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

    22  * CA 95054 USA or visit www.sun.com if you need additional information or

    23  * have any questions.

    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 

    44     FontMetrics getFontMetrics()

    45     {

    46         if (cachedFontMetrics != null)

    47             return cachedFontMetrics;

    48         else return getFontMetrics(getPeerFont());

    49 

    50     }

    51 

    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 

    62     XLabelPeer(Label target) {

    63         super(target);

    64     }

    65 

    66     /**

    67      * Minimum size.

    68      */

    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     public void paint(Graphics g) {

    89         int textX = 0;

    90         int textY = 0;

    91         g.setColor(getPeerBackground());

    92         g.fillRect(0, 0, width, height);

    93 

    94         Font f = getPeerFont();

    95         g.setFont(f);

    96         FontMetrics fm = g.getFontMetrics();

    97 

    98         if (cachedFontMetrics == null)

    99         {

   100             cachedFontMetrics = fm;

   101         }

   102         else

   103         {

   104             if (oldfont != f)

   105                 cachedFontMetrics = fm;

   106         }

   107 

   108         switch (alignment) {

   109           case Label.LEFT:

   110               textX = 2;

   111               textY = (height + fm.getMaxAscent() - fm.getMaxDescent()) / 2;

   112               break;

   113           case Label.RIGHT:

   114               textX = width - (fm.stringWidth(label) + 2);

   115               textY = (height + fm.getMaxAscent() - fm.getMaxDescent()) / 2;

   116               break;

   117           case Label.CENTER:

   118               textX = (width - fm.stringWidth(label)) / 2;

   119               textY = (height + fm.getMaxAscent() - fm.getMaxDescent()) / 2;

   120               break;

   121         }

   122         if (isEnabled()) {

   123             g.setColor(getPeerForeground());

   124             g.drawString(label, textX, textY);

   125         }

   126         else {

   127             g.setColor(getPeerBackground().brighter());

   128             g.drawString(label, textX, textY);

   129             g.setColor(getPeerBackground().darker());

   130             g.drawString(label, textX - 1, textY - 1);

   131         }

   132     }

   133 

   134     public void setText(String text) {

   135         label = text;

   136         if (label == null) {

   137             label = "";

   138         }

   139         repaint();

   140     }

   141     public void setFont(Font f) {

   142         super.setFont(f);

   143         target.repaint();

   144     }

   145 

   146     public void setAlignment(int align) {

   147         alignment = align;

   148         repaint();

   149     }

   150 }