Java tutorial
/* * Copyright (c) Ian F. Darwin, http://www.darwinsys.com/, 1996-2002. * All rights reserved. Software written by Ian F. Darwin and others. * $Id: LICENSE,v 1.8 2004/02/09 03:33:38 ian Exp $ * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. * * Java, the Duke mascot, and all variants of Sun's Java "steaming coffee * cup" logo are trademarks of Sun Microsystems. Sun's, and James Gosling's, * pioneering role in inventing and promulgating (and standardizing) the Java * language and environment is gratefully acknowledged. * * The pioneering role of Dennis Ritchie and Bjarne Stroustrup, of AT&T, for * inventing predecessor languages C and C++ is also gratefully acknowledged. */ import java.awt.Color; import java.awt.Component; import java.awt.Container; import java.awt.Dimension; import java.awt.Font; import java.awt.FontMetrics; import java.awt.Graphics; import java.awt.GridLayout; import java.text.DecimalFormat; import java.util.Calendar; import javax.swing.Icon; import javax.swing.JButton; import javax.swing.JComponent; import javax.swing.JFrame; /** * Display one of those standard Calendar Page icons with Weekday, Day and * Month. Can be used as the Icon in a JButton. Can include or exclude an * updating Clock at the top (invoke constructor with value of true to include). * However, it should be excluded when using as an Icon, and true when using as * a Component. * * @author Ian Darwin, http://www.darwinsys.com * @version $Id: CalIcon.java,v 1.3 2003/05/29 18:06:31 ian Exp $ */ public class CalIcon extends JComponent implements Icon { /** The size shalle be 64x64. */ protected final int SIZE = 64; protected final Dimension d = new Dimension(SIZE, SIZE); /** The size of the inner white box */ protected final int RBW = 40, RBH = 40; /** The x location of the inner box */ protected final int RBX; /** The y location of the inner box */ protected final int RBY; /** Our Calendar */ protected Calendar myCal; /** True if user wants the time shown */ protected boolean showTime = true; /** The Clock to show the time, if showTime */ protected Clock clock; /** Font for displaying the time */ protected Font dayNumbFont; /** FontMetrics for displaying the time */ protected FontMetrics dayNumbFM; /** Font for displaying the time */ protected Font dayNameFont; /** FontMetrics for displaying the time */ protected FontMetrics dayNameFM; /** Font for displaying the time */ protected Font monNameFont; /** FontMetrics for displaying the time */ protected FontMetrics monNameFM; /** Construct the object with default arguments */ public CalIcon(boolean showT) { this(Calendar.getInstance(), showT); } /** Construct the object with a Calendar object */ public CalIcon(Calendar c, boolean showT) { super(); showTime = showT; myCal = c; setLayout(null); // we don't need another layout, ... if (showTime) { // System.err.println("Constructing and adding Clock"); clock = new Clock(); add(clock); clock.setBounds(0, 2, SIZE, 10); // clock.setBackground(Color.black); // clock.setForeground(Color.green); RBY = d.height - (RBH + (showTime ? 12 : 0) / 2); } else { RBY = 6; } RBX = 12; // raised box x offset // System.err.println("RBX, RBY = " + RBX + "," + RBY); dayNumbFont = new Font("Serif", Font.BOLD, 20); dayNumbFM = getFontMetrics(dayNumbFont); dayNameFont = new Font("SansSerif", Font.PLAIN, 10); dayNameFM = getFontMetrics(dayNameFont); monNameFont = new Font("SansSerif", Font.ITALIC, 10); monNameFM = getFontMetrics(monNameFont); } /** Days of the week */ public String[] days = { "SUN", "MON", "TUE", "WED", "THU", "FRI", "SAT" }; public String[] mons = { "JAN", "FEB", "MAR", "APR", "MAY", "JUN", "JUL", "AUG", "SEP", "OCT", "NOV", "DEC", }; /** * Paint: draw the calendar page in the JComponent. Delegates most work to * paintIcon(). */ public void paint(Graphics g) { paintIcon(this, g, 0, 0); } /** paintIcon: draw the calendar page. */ public void paintIcon(Component c, Graphics g, int x, int y) { // Allow clock to get painted (voodoo magic) if (showTime) super.paint(g); // Outline it. g.setColor(Color.black); g.draw3DRect(x, y, d.width - 2, d.height - 2, true); // Show the date: First, a white page with a drop shadow. g.setColor(Color.gray); g.fillRect(x + RBX + 3, y + RBY + 3, RBW, RBH); g.setColor(Color.white); g.fillRect(x + RBX, y + RBY, RBW, RBH); // g.setColor(getForeground()); g.setColor(Color.black); String s = days[myCal.get(Calendar.DAY_OF_WEEK) - 1]; g.setFont(dayNameFont); int w = dayNameFM.stringWidth(s); g.drawString(s, x + RBX + ((RBW - w) / 2), y + RBY + 10); s = Integer.toString(myCal.get(Calendar.DAY_OF_MONTH)); g.setFont(dayNumbFont); w = dayNumbFM.stringWidth(s); g.drawString(s, x + RBX + ((RBW - w) / 2), y + RBY + 25); s = mons[myCal.get(Calendar.MONTH)]; g.setFont(monNameFont); w = monNameFM.stringWidth(s); g.drawString(s, x + RBX + ((RBW - w) / 2), y + RBY + 35); } public int getIconWidth() { return SIZE; } public int getIconHeight() { return SIZE; } public Dimension getPreferredSize() { return d; } public Dimension getMinimumSize() { return d; } public static void main(String[] args) { JFrame jf = new JFrame("Calendar"); Container cp = jf.getContentPane(); cp.setLayout(new GridLayout(0, 1, 5, 5)); CalIcon c = new CalIcon(true); cp.add(c); JButton j = new JButton("As Icon", new CalIcon(false)); cp.add(j); jf.pack(); jf.setVisible(true); } } class Clock extends javax.swing.JComponent { protected DecimalFormat tflz, tf; protected boolean done = false; public Clock() { new Thread(new Runnable() { public void run() { while (!done) { Clock.this.repaint(); // request a redraw try { Thread.sleep(1000); } catch (InterruptedException e) { /* do nothing*/ } } } }).start(); tf = new DecimalFormat("#0"); tflz = new DecimalFormat("00"); } public void stop() { done = true; } /* paint() - get current time and draw (centered) in Component. */ public void paint(Graphics g) { Calendar myCal = Calendar.getInstance(); StringBuffer sb = new StringBuffer(); sb.append(tf.format(myCal.get(Calendar.HOUR))); sb.append(':'); sb.append(tflz.format(myCal.get(Calendar.MINUTE))); sb.append(':'); sb.append(tflz.format(myCal.get(Calendar.SECOND))); String s = sb.toString(); FontMetrics fm = getFontMetrics(getFont()); int x = (getSize().width - fm.stringWidth(s)) / 2; // System.out.println("Size is " + getSize()); g.drawString(s, x, 10); } public Dimension getPreferredSize() { return new Dimension(100, 30); } public Dimension getMinimumSize() { return new Dimension(50, 10); } }