/*

 * Copyright 2002-2003 Sun Microsystems, Inc.  All Rights Reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Sun designates this

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

 * by Sun in the LICENSE file that accompanied this code.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

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

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

 * have any questions.

 */

package sun.awt.X11;

import java.awt.*;

import java.awt.peer.*;

class XLabelPeer extends XComponentPeer implements LabelPeer {

    /**

     * Create the label

     */

    static final int            TEXT_XPAD = 8;

    static final int            TEXT_YPAD = 6;

    String label;

    int alignment;

    FontMetrics cachedFontMetrics;

    Font oldfont;

    FontMetrics getFontMetrics()

    {

        if (cachedFontMetrics != null)

            return cachedFontMetrics;

        else return getFontMetrics(getPeerFont());

    }

    void preInit(XCreateWindowParams params) {

        super.preInit(params);

        Label target = (Label) this.target;

        label = target.getText();

        if (label == null) {

            label = "";

        }

        alignment = target.getAlignment();

    }

    XLabelPeer(Label target) {

        super(target);

    }

    /**

     * Minimum size.

     */

    public Dimension getMinimumSize() {

        FontMetrics fm = getFontMetrics();

        int w;

        try {

            w = fm.stringWidth(label);

        }

        catch (NullPointerException e) {

            w = 0;

        }

        return new Dimension(w + TEXT_XPAD,

                             fm.getAscent() + fm.getMaxDescent() + TEXT_YPAD);

    }

    /**

     * Paint the label

     */

    // NOTE: This method is called by privileged threads.

    //       DO NOT INVOKE CLIENT CODE ON THIS THREAD!

    public void paint(Graphics g) {

        int textX = 0;

        int textY = 0;

        g.setColor(getPeerBackground());

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

        Font f = getPeerFont();

        g.setFont(f);

        FontMetrics fm = g.getFontMetrics();

        if (cachedFontMetrics == null)

        {

            cachedFontMetrics = fm;

        }

        else

        {

            if (oldfont != f)

                cachedFontMetrics = fm;

        }

        switch (alignment) {

          case Label.LEFT:

              textX = 2;

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

              break;

          case Label.RIGHT:

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

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

              break;

          case Label.CENTER:

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

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

              break;

        }

        if (isEnabled()) {

            g.setColor(getPeerForeground());

            g.drawString(label, textX, textY);

        }

        else {

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

            g.drawString(label, textX, textY);

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

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

        }

    }

    public void setText(String text) {

        label = text;

        if (label == null) {

            label = "";

        }

        repaint();

    }

    public void setFont(Font f) {

        super.setFont(f);

        target.repaint();

    }

    public void setAlignment(int align) {

        alignment = align;

        repaint();

    }

}