aTicker
Java Source:
// -----------------------------------------------------------
// aTicker.java | class aTicker
// -----------------------------------------------------------
// Author : R. BERTHOU
// E-Mail : rbl@berthou.com
// URL : http://www.javaside.com
// -----------------------------------------------------------
// ------------------- aTicker V 1.00 ------------------------
//
//
// -----------------------------------------------------------
// Ver * Author * DATE * Description
// ....................DD/MM/YY...............................
// 1.00 * R. BERTHOU * 01/03/00 * Creation
// -----------------------------------------------------------
import java.awt.Font;
import java.awt.FontMetrics;
import java.awt.Graphics;
import java.awt.Color;
import java.awt.Image;
import java.awt.Event;
import java.awt.Cursor;
import java.awt.event.MouseListener ;
import java.awt.event.MouseMotionListener ;
import java.awt.event.MouseEvent ;
import java.io.BufferedReader ;
import java.io.InputStreamReader ;
import java.util.Vector ;
import java.util.Enumeration ;
import java.net.URL;
// pour LiveConnect...
import netscape.javascript.JSObject;
public class aTicker extends java.applet.Applet
implements Runnable, MouseMotionListener, MouseListener
{
// Declare the controlling thread for the applet
public Vector dFile = new Vector( 5, 5 );
Thread scrollmessage;
private char cSep = ';' ;
String sMess ;
boolean bLoc = false ;
// Declare the details for the message to be displayed
int s_h ; // Longueur du message
int iMax ; // Nombre de Message
int iActif = 999; // Message Actif
int iCur = -1 ;
int cBk = 0x000000 ; // Nombre de Message
// Variables controlling the display of the message
int x_coord, // present x-position
y_coord, // present y-position
speed, // scrolling amount
iPas, // (integer) pas entre 2 messages
delay; // scrolling speed
// for storing the dimensions of the applet
int aWidth, aHeight;
// for double buffering to prevent flicker
Image offScreenImage;
Graphics offScreen;
// Font control variables
Font wFont1; // Message
Font wFont2; // Message Actif
int cT1 = 0xFFFFFF ; // Message
int cT2 = 0xFFFF00 ; // Message Actif
FontMetrics wM;
// Applet initialisation routine
public void init() {
// Temporary storage space
String temp;
addMouseMotionListener(this) ;
addMouseListener(this) ;
// get the speed of the scrolling
temp = getParameter("speed");
speed= (temp==null) ? 1 : Integer.parseInt( temp );
temp = getParameter("delay");
delay= (temp==null) ? 20 : Integer.parseInt( temp );
temp = getParameter("pas");
iPas = (temp==null) ? 20 : Integer.parseInt( temp );
temp = getParameter("bgcolor");
cBk = (temp==null) ? 0x202080 : Integer.parseInt( temp );
temp = getParameter("cSep");
if (temp != null) cSep = temp.charAt(0) ;
temp = getParameter("local");
if (temp != null) bLoc = true ;
temp = getParameter("Font1") ;
if (temp == null)
temp = "Arail, 10, 1, " + 0xFFFFFF + " " ;
setFont(1, temp) ;
temp = getParameter("Font2") ;
if (temp == null)
temp = "Arail, 10, 2, " + 0xFFFF00 + " " ;
setFont(2, temp) ;
// fichier
temp = getParameter("file");
if (temp==null)
temp="mess.txt" ;
wM = getFontMetrics (wFont1);
readFile(temp) ;
} // end of init
public void setFont(int z, String s) {
int j = 0 ;
int k = 0 ;
int i ;
String sF = "" ;
int iS = 10 ;
int iT = 1 ;
int iC = 0xFFFFFF ;
String p ;
while (true) {
i = s.indexOf(',', j) ;
if (i > 0)
p = new String(s.substring(j, i).trim()) ;
else
p = new String(s.substring(j).trim()) ;
if ((i>-1) || (p.length() > 0)) {
if ( k == 0) sF = new String(p) ;
if ( k == 1) iS = Integer.parseInt(p) ;
if ( k == 2) iT = Integer.parseInt(p) ;
if ( k == 3) iC = Integer.parseInt(p) ;
k++ ;
}
if (i == -1) break ;
else j = i + 1 ;
}
Font f = new Font(sF, iT, iS) ;
if (f == null) f = getFont() ;
if (z == 1) {
wFont1 = f ;
cT1 = iC ;
}
else {
wFont2 = f ;
cT2 = iC ;
}
}
public void readFile(String f) {
dFile.removeAllElements() ;
iMax = 0;
// open stream to a file which name is expressed relative to the document URL
BufferedReader fis = null ;
if (bLoc == false)
try {
fis = new BufferedReader( new InputStreamReader( (new URL( getCodeBase(), f )).openStream()) ) ;
} catch( Exception e ) {
fis = null ;
bLoc = true ;
}
rp s = null ;
String sS ;
int iL = 0 ;
// parser loop
while ( true ) {
s = new rp();
if (bLoc) {
sS = getParameter(f + iL) ;
iL++ ;
}
else
try {
sS = fis.readLine() ;
} catch( Exception e ) {
break ;
}
if (s.get( sS, cSep, "_new", 0xFFFFFF, 0xFFFF00 )) {
if (s.sM != null ) {
dFile.addElement( s );
iMax++ ;
}
}
else
break ;
}
iActif = 0 ;
sMess = ((rp)dFile.elementAt(iActif)).sM ;
s_h = - wM.stringWidth(sMess) ;
}
// control the starting of the applet
public void start() {
// start the thread
scrollmessage = new Thread(this);
scrollmessage.start();
} // end of start
// control the stopping of the applet
public void stop() {
scrollmessage.stop();
} // end of stop
// control the running of the applet
public void run() {
// set the priority of the thread to low
Thread.currentThread().setPriority(Thread.MIN_PRIORITY);
// loop continuously
while(true) {
// values for working out the constant delay
long thisTick, waitTick;
// calculate the tick to wait for
waitTick = System.currentTimeMillis() + delay;
// update the screen
x_coord -= speed;
if (x_coord= iMax) iActif = 0 ;
sMess = ((rp)dFile.elementAt(iActif)).sM ;
s_h = -wM.stringWidth(sMess) ;
}
repaint ();
thisTick = System.currentTimeMillis();
if ( thisTick l) && (x < (l+lt))) {
iZ = i ;
break ;
}
else {
l = l + iPas + lt ;
i++ ;
if (i >= iMax) i = 0 ;
}
if (l > aWidth)
break ;
}
if (iZ != iCur) {
if (iZ == -1)
this.setCursor(new Cursor(Cursor.DEFAULT_CURSOR));
else
this.setCursor(new Cursor(Cursor.HAND_CURSOR));
iCur = iZ ;
if (iCur == -1) {
showStatus("") ;
}
else {
if (((rp)dFile.elementAt(iCur)).sH == null)
showStatus(((rp)dFile.elementAt(iCur)).sU) ;
else
showStatus(((rp)dFile.elementAt(iCur)).sH) ;
}
repaint() ;
}
}
public void mouseClicked(MouseEvent e) {
if (iCur == -1) return ;
if ( ((rp)dFile.elementAt(iCur)).sU != null) {
URL clickDest ;
try{
if (((rp)dFile.elementAt(iCur)).sT.equals("_script")){
JSObject.getWindow (this).eval (((rp)dFile.elementAt(iCur)).sU );
}
else {
if ( ((rp)dFile.elementAt(iCur)).sU.charAt(0) == '.')
clickDest = new URL(getCodeBase(), ((rp)dFile.elementAt(iCur)).sU );
else
clickDest = new URL(((rp)dFile.elementAt(iCur)).sU);
getAppletContext().showDocument(clickDest, ((rp)dFile.elementAt(iCur)).sT );
}
}catch(Exception z) {
showStatus("Bad URL! =" + ((rp)dFile.elementAt(iCur)).sU );
}
}
}
public void mouseReleased(MouseEvent e) { }
public void mousePressed(MouseEvent e) { }
public void mouseEntered(MouseEvent e) {
try {
scrollmessage.suspend() ;
} catch (Exception e2) {}
}
public void mouseExited(MouseEvent e) {
try {
scrollmessage.resume() ;
} catch (Exception e2) {}
iCur = -1 ;
showStatus("");
}
// Called when the applet needs to be painted
// calls the flicker free updating system
public void paint (Graphics g) {
update(g);
} // end of paint
// Draw the applet without flicker
public synchronized void update(Graphics g) {
// get the size of the applet
int aW = getSize().width ;
int aH = getSize().height ;
if ((aWidth != aW) || (aHeight != aH) || (offScreen == null)) {
// initialise the double buffering screen
try {
offScreenImage = createImage (aW, aH);
offScreen = offScreenImage.getGraphics ();
} catch (Exception e) {
offScreen = null;
}
aWidth = aW ;
aHeight = aH ;
y_coord = aHeight/2 + (wM.getHeight()-wM.getDescent())/2;
x_coord = aWidth;
}
if (offScreen!=null) {
paintApplet(offScreen);
g.drawImage(offScreenImage,0,0,this);
} else
paintApplet(g);
} // end of update
// Paint the applet into whatever image
public void paintApplet(Graphics g) {
g.clearRect(0,0,aWidth,aHeight);
g.setColor ( new Color ( cBk ) );
g.fillRect(0, 0, aWidth, aHeight ) ;
int i = iActif ;
int l = x_coord ;
while (true) {
if (iCur == i) {
g.setColor ( new Color ( cT2 ) );
g.setFont( wFont2 ) ;
}
else {
g.setColor ( new Color ( cT1 ) );
g.setFont( wFont1 ) ;
}
g.drawString ( ((rp)dFile.elementAt(i)).sM , l, y_coord ) ;
l += iPas + wM.stringWidth( ((rp)dFile.elementAt(i)).sM ) ;
i++ ;
if (i >= iMax) i = 0 ;
if (l > aWidth)
break ;
}
} // end of paintApplet
}
// end aTicker
class rp extends Object {
public String sU = null ; // dest URL
public String sM = null ; // message
public String sT = null ; // target
public String sH = null ; // Help
public int l1 ; // Color std
public int l2 ; // Color active
public int lg = -1 ;
public boolean get( String st, char cSep, String starg, int d1, int d2 ) {
int i = 0 ;
int j = 0 ;
int k = 0 ;
String p ;
if (st == null) return false ;
sM = null ;
sU = "" ;
sT = starg ;
sH = null ;
l1 = d1 ;
l2 = d2 ;
lg = -1 ;
while (true) {
i = st.indexOf(cSep, j) ;
if (i > 0)
p = new String(st.substring(j, i).trim()) ;
else
p = new String(st.substring(j).trim()) ;
if ((i>-1) || (p.length() > 0)) {
if ( k == 0) sM = new String(p) ;
if ( k == 1) sU = new String(p) ;
if (p.length() > 0) {
if (p.charAt(0) =='?')
sH = p.substring(1) ;
else {
if ( k == 2) sT = new String(p) ;
if ( k == 3) l1 = Integer.parseInt(p) ;
if ( k == 4) l2 = Integer.parseInt(p) ;
}
}
k++ ;
}
if (i == -1) break ;
else j = i + 1 ;
}
return ( k > 0 ) ;
}
}
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