如何用java实现下拉菜单

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/* 336x280, 创建于 07-11-21 */

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//

import java.applet.Applet;

import java.applet.AppletContext;

import java.awt.*;

import java.net.MalformedURLException;

import java.net.URL;

import java.util.*;

public class basictoc2 extends Applet

implements Runnable

{

public void init()

{

String s5 = "";

String s6 = "";

String s7 = "";

String s8 = "";

String s9 = "";

String s10 = "";

setBackground(Color.white);

String s;

int i = (s = getParameter("BGCOLOR")) == null ? Integer.parseInt("ffffff", 16) : Integer.parseInt(s, 16);

bgimgfile = (s = getParameter("BGIMAGE")) == null ? "" : s;

if(bgimgfile.length() == 0)

{

setBackground(new Color(i));

} else

{

bgimg = getImage(getCodeBase(), bgimgfile);

mt.addImage(bgimg, 1);

}

String s12 = (s = getParameter("ITEMHEIGHT")) == null ? "25" : s;

if(s12.indexOf('|') < 0)

gifh = Integer.parseInt(s12);

setBackground(new Color(i));

String s1 = (s = getParameter("AUTHORINFO")) == null ? "" : s;

isimgstrip = (s = getParameter("isIMAGESTRIP")) == null ? "yes" : s;

if(isimgstrip.equals("no"))

{

txtcolor = (s = getParameter("TEXTCOLOR")) == null ? Integer.parseInt("aa6666", 16) : Integer.parseInt(s, 16);

symbolcolor = (s = getParameter("SYMBOLCOLOR")) == null ? Integer.parseInt("aa6666", 16) : Integer.parseInt(s, 16);

highlightcolor = (s = getParameter("HIGHLIGHTCOLOR")) == null ? Integer.parseInt("000088", 16) : Integer.parseInt(s, 16);

s5 = (s = getParameter("FONT1")) == null ? "" : s;

s6 = (s = getParameter("FONT2")) == null ? "" : s;

spacing = (s = getParameter("SPACING1")) == null ? 4 : Integer.parseInt(s);

spacing2 = (s = getParameter("SPACING2")) == null ? 2 : Integer.parseInt(s);

}

if(s5.length() > 0)

{

sg = new StringTokenizer(s5, ";");

try

{

while(sg.hasMoreTokens())

{

s7 = sg.nextToken().trim();

s9 = sg.nextToken().trim();

font1psize = Integer.parseInt(sg.nextToken().trim());

}

}

catch(NoSuchElementException _ex) { }

if(s9.equals("bold"))

fm = new Font(s7, 1, font1psize);

else

if(s9.equals("italic"))

fm = new Font(s7, 2, font1psize);

else

if(s9.equals("plain"))

fm = new Font(s7, 0, font1psize);

else

fm = new Font(s7, 3, font1psize);

}

if(s6.length() > 0)

{

sg = new StringTokenizer(s6, ";");

try

{

while(sg.hasMoreTokens())

{

s8 = sg.nextToken().trim();

s10 = sg.nextToken().trim();

font2psize = Integer.parseInt(sg.nextToken().trim());

}

}

catch(NoSuchElementException _ex) { }

if(s10.equals("bold"))

fm2 = new Font(s8, 1, font2psize);

else

if(s10.equals("italic"))

fm2 = new Font(s8, 2, font2psize);

else

if(s10.equals("plain"))

fm2 = new Font(s8, 0, font2psize);

else

fm2 = new Font(s8, 3, font2psize);

}

String s4;

if(s1.indexOf("Nalla Senthilnathan") >= 0 && s1.indexOf("nrsenthil.tripod.com") >= 0)

s4 = (s = getParameter("TOCDATA")) == null ? "" : s;

else

s4 = "";

String s11 = (s = getParameter("CURRENTDOC")) == null ? "" : s;

byte byte0 = -1;

String s2 = "";

st = new StringTokenizer(s4, "|");

try

{

while(st.hasMoreTokens())

{

st2 = new StringTokenizer(st.nextToken(), ";");

try

{

while(st2.hasMoreTokens())

{

elems.addElement(new basictoc2Rec());

((basictoc2Rec)elems.elementAt(elemcount)).level = Integer.parseInt(st2.nextToken().trim());

String s3 = st2.nextToken().trim();

((basictoc2Rec)elems.elementAt(elemcount)).helpstr = s3;

if(isimgstrip.equals("yes"))

{

((basictoc2Rec)elems.elementAt(elemcount)).altstr = st2.nextToken().trim();

((basictoc2Rec)elems.elementAt(elemcount)).itemh = gifh;

} else

if(s3.indexOf(',') > 0)

{

st3 = new StringTokenizer(s3, ",");

try

{

while(st3.hasMoreTokens())

{

((basictoc2Rec)elems.elementAt(elemcount)).helpstr = st3.nextToken().trim();

((basictoc2Rec)elems.elementAt(elemcount)).altstr = st3.nextToken().trim();

}

}

catch(NoSuchElementException _ex) { }

if(((basictoc2Rec)elems.elementAt(elemcount)).level == 1)

((basictoc2Rec)elems.elementAt(elemcount)).itemh = 2 * spacing 2 * font1psize spacing2;

else

((basictoc2Rec)elems.elementAt(elemcount)).itemh = 2 * spacing 2 * font2psize spacing2;

} else

if(((basictoc2Rec)elems.elementAt(elemcount)).level == 1)

((basictoc2Rec)elems.elementAt(elemcount)).itemh = font1psize spacing * 2;

else

((basictoc2Rec)elems.elementAt(elemcount)).itemh = font2psize spacing * 2;

((basictoc2Rec)elems.elementAt(elemcount)).target = st2.nextToken().trim();

if(((basictoc2Rec)elems.elementAt(elemcount)).level == 1)

{

((basictoc2Rec)elems.elementAt(elemcount)).ishead = true;

((basictoc2Rec)elems.elementAt(elemcount)).isopen = false;

((basictoc2Rec)elems.elementAt(elemcount)).isvisible = true;

int j = elemcount;

} else

{

((basictoc2Rec)elems.elementAt(elemcount)).ishead = false;

((basictoc2Rec)elems.elementAt(elemcount)).isopen = false;

((basictoc2Rec)elems.elementAt(elemcount)).isvisible = false;

}

s3 = st2.nextToken().trim();

if(s3.length() == 1)

{

((basictoc2Rec)elems.elementAt(elemcount)).urlstr = "";

elemcount ;

} else

{

((basictoc2Rec)elems.elementAt(elemcount)).urlstr = s3;

elemcount ;

}

break;

}

}

catch(NoSuchElementException _ex) { }

}

}

catch(NoSuchElementException _ex) { }

try

{

for(int k = 0; k < elemcount; k )

if(((basictoc2Rec)elems.elementAt(k)).urlstr.length() > 0)

urls.addElement(new URL(getDocumentBase(), ((basictoc2Rec)elems.elementAt(k)).urlstr));

else

urls.addElement(null);

}

catch(MalformedURLException _ex) { }

int l1 = 0;

if(isimgstrip.equals("yes"))

{

for(int l = 0; l < elemcount; l )

{

((basictoc2Rec)elems.elementAt(l)).defimg = getImage(getCodeBase(), ((basictoc2Rec)elems.elementAt(l)).helpstr);

mt.addImage(((basictoc2Rec)elems.elementAt(l)).defimg, l1);

l1 ;

((basictoc2Rec)elems.elementAt(l)).altimg = getImage(getCodeBase(), ((basictoc2Rec)elems.elementAt(l)).altstr);

mt.addImage(((basictoc2Rec)elems.elementAt(l)).altimg, l1);

l1 ;

}

if(s12.indexOf('|') > 0)

{

st3 = new StringTokenizer(s12, "|");

for(int i1 = 0; i1 < elemcount; i1 )

try

{

if(st3.hasMoreTokens())

((basictoc2Rec)elems.elementAt(i1)).itemh = Integer.parseInt(st3.nextToken());

}

catch(NoSuchElementException _ex) { }

} else

{

for(int j1 = 0; j1 < elemcount; j1 )

((basictoc2Rec)elems.elementAt(j1)).itemh = gifh;

}

}

if(s11.length() > 0)

{

for(int k1 = 0; k1 < elemcount; k1 )

if(((basictoc2Rec)elems.elementAt(k1)).ishead)

{

if(((basictoc2Rec)elems.elementAt(k1)).urlstr.equals(s11))

{

docidx = k1;

return;

}

for(int i2 = k1 1; i2 < elemcount; i2 )

{

if(((basictoc2Rec)elems.elementAt(i2)).ishead)

break;

if(!((basictoc2Rec)elems.elementAt(i2)).urlstr.equals(s11))

continue;

docidx = i2;

((basictoc2Rec)elems.elementAt(k1)).isopen = true;

openAllTails(k1);

break;

}

}

}

}

public void update(Graphics g)

{

Dimension dimension = size();

if(offscreen == null || dimension.width != offscreensize.width || dimension.height != offscreensize.height)

{

offscreen = createImage(dimension.width, dimension.height);

offscreensize = dimension;

offgraphics = offscreen.getGraphics();

}

offgraphics.setColor(getBackground());

offgraphics.fillRect(0, 0, dimension.width, dimension.height);

paint(offgraphics);

g.drawImage(offscreen, 0, 0, null);

}

public synchronized boolean mouseDown(Event event, int i, int j)

{

if(event.id == 501 && event.clickCount == 1)

{

int k = 0;

int l = -1;

int i1 = 0;

boolean flag = false;

for(; i1 < elemcount; i1 )

{

if(!((basictoc2Rec)elems.elementAt(i1)).isvisible)

continue;

int j1 = ((basictoc2Rec)elems.elementAt(i1)).itemh;

if(event.y >= k && event.y <= k j1)

{

if(((basictoc2Rec)elems.elementAt(i1)).urlstr.length() > 0)

{

getAppletContext().showDocument((URL)urls.elementAt(i1), ((basictoc2Rec)elems.elementAt(i1)).target);

docidx = i1;

if(((basictoc2Rec)elems.elementAt(i1)).ishead)

closeAllTails2();

return true;

}

if(((basictoc2Rec)elems.elementAt(i1)).ishead)

{

l = i1;

break;

}

}

k = j1;

}

i1 = 0;

if(l >= 0)

for(; i1 < elemcount; i1 )

if(((basictoc2Rec)elems.elementAt(i1)).ishead)

if(i1 == l)

{

if(((basictoc2Rec)elems.elementAt(i1)).isopen)

{

((basictoc2Rec)elems.elementAt(i1)).isopen = false;

closeAllTails(i1);

} else

{

((basictoc2Rec)elems.elementAt(i1)).isopen = true;

openAllTails(i1);

}

} else

if(((basictoc2Rec)elems.elementAt(i1)).isopen)

{

((basictoc2Rec)elems.elementAt(i1)).isopen = false;

closeAllTails(i1);

}

return true;

} else

{

return false;

}

}

public void closeAllTails2()

{

for(int i = 0; i < elemcount; i )

if(((basictoc2Rec)elems.elementAt(i)).ishead && ((basictoc2Rec)elems.elementAt(i)).isopen)

{

((basictoc2Rec)elems.elementAt(i)).isopen = false;

closeAllTails(i);

}

}

public void closeAllTails(int i)

{

for(int j = i 1; j < elemcount; j )

{

if(((basictoc2Rec)elems.elementAt(j)).ishead)

break;

((basictoc2Rec)elems.elementAt(j)).isvisible = false;

((basictoc2Rec)elems.elementAt(j)).isopen = false;

}

}

public void openAllTails(int i)

{

for(int j = i 1; j < elemcount; j )

{

if(((basictoc2Rec)elems.elementAt(j)).ishead)

break;

((basictoc2Rec)elems.elementAt(j)).isvisible = true;

((basictoc2Rec)elems.elementAt(j)).isopen = true;

}

}

public boolean handleEvent(Event event)

{

if(event.id == 505)

mousemoved = 0;

return super.handleEvent(event);

}

public void paint(Graphics g)

{

int k = 0;

if(mousemoved == 1 && urlmsg >= 0)

showStatus(((basictoc2Rec)elems.elementAt(urlmsg)).urlstr);

openmsg = 0;

closemsg = 0;

urlmsg = -1;

if(isimgstrip.equals("yes"))

if(mt.checkAll(true))

{

for(int i = 0; i < elemcount; i )

if(((basictoc2Rec)elems.elementAt(i)).isvisible)

{

int i1 = ((basictoc2Rec)elems.elementAt(i)).itemh;

if(mousemoved == 1 && mousey >= k && mousey <= k i1)

{

g.drawImage(((basictoc2Rec)elems.elementAt(i)).altimg, 0, k, this);

urlmsg = i;

} else

if(docidx == i || ((basictoc2Rec)elems.elementAt(i)).ishead && ((basictoc2Rec)elems.elementAt(i)).isopen)

g.drawImage(((basictoc2Rec)elems.elementAt(i)).altimg, 0, k, this);

else

g.drawImage(((basictoc2Rec)elems.elementAt(i)).defimg, 0, k, this);

k = i1;

}

return;

} else

{

g.setColor(Color.black);

g.drawString("Loading TOC...,", bounds().width / 5, bounds().height / 2);

return;

}

if(bgimgfile.length() > 0 && mt.checkAll(true))

g.drawImage(bgimg, 0, 0, this);

for(int j = 0; j < elemcount; j )

if(((basictoc2Rec)elems.elementAt(j)).isvisible)

{

int j1 = ((basictoc2Rec)elems.elementAt(j)).itemh;

if(mousemoved == 1 && mousey >= k && mousey <= k j1)

urlmsg = j;

int l;

int k1;

if(((basictoc2Rec)elems.elementAt(j)).ishead)

{

g.setFont(fm);

l = k spacing font1psize;

k1 = font1psize;

} else

{

g.setFont(fm2);

l = k spacing font2psize;

k1 = font2psize;

}

g.setColor(new Color(symbolcolor));

if(((basictoc2Rec)elems.elementAt(j)).ishead)

if(((basictoc2Rec)elems.elementAt(j)).urlstr.length() > 0)

{

if(mousemoved == 1 && mousey >= k && mousey <= k j1 || docidx == j)

g.fillRect(10, l - (int)((double)font1psize * 0.80000000000000004D), (int)((double)font1psize * 0.5D), (int)((double)font1psize * 0.80000000000000004D));

g.drawRect(10, l - (int)((double)font1psize * 0.80000000000000004D), (int)((double)font1psize * 0.5D), (int)((double)font1psize * 0.80000000000000004D));

} else

if(((basictoc2Rec)elems.elementAt(j)).isopen)

{

drawFillOpentria(g, l);

drawOpentria(g, l);

} else

{

if(mousemoved == 1 && mousey >= k && mousey <= k j1)

drawFillClosetria(g, l);

drawClosetria(g, l);

}

if(mousemoved == 1 && mousey >= k && mousey <= k j1 || docidx == j)

g.setColor(new Color(highlightcolor));

else

g.setColor(new Color(txtcolor));

g.drawString(((basictoc2Rec)elems.elementAt(j)).helpstr, 25, l);

k = l spacing;

if(((basictoc2Rec)elems.elementAt(j)).altstr.length() > 0)

{

k = l spacing2;

g.drawString(((basictoc2Rec)elems.elementAt(j)).altstr, 25, k k1);

k = k k1 spacing;

}

}

}

public void drawClosetria(Graphics g, int i)

{

int ai[] = new int[4];

int ai1[] = new int[4];

gifh = (font1psize * 3) / 2;

ai[0] = 10;

ai[1] = 10;

ai[2] = 10 (int)((double)font1psize * 0.59999999999999998D);

ai[3] = 10;

ai1[0] = i - (int)((double)font1psize * 0.90000000000000002D);

ai1[1] = i;

ai1[2] = i - (int)(((double)font1psize * 0.90000000000000002D) / 2D);

ai1[3] = i - (int)((double)font1psize * 0.90000000000000002D);

g.drawPolygon(ai, ai1, 4);

}

public void drawOpentria(Graphics g, int i)

{

int ai[] = new int[4];

int ai1[] = new int[4];

ai[0] = 10;

ai[1] = 10 (int)((double)font1psize * 0.69999999999999996D);

ai[2] = 10 (int)(((double)font1psize * 0.69999999999999996D) / 2D);

ai[3] = 10;

ai1[0] = i - (int)((double)font1psize * 0.69999999999999996D);

ai1[1] = i - (int)((double)font1psize * 0.69999999999999996D);

ai1[2] = i;

ai1[3] = i - (int)((double)font1psize * 0.69999999999999996D);

g.drawPolygon(ai, ai1, 4);

}

public void drawFillClosetria(Graphics g, int i)

{

int ai[] = new int[4];

int ai1[] = new int[4];

gifh = (font1psize * 3) / 2;

ai[0] = 10;

ai[1] = 10;

ai[2] = 10 (int)((double)font1psize * 0.59999999999999998D);

ai[3] = 10;

ai1[0] = i - (int)((double)font1psize * 0.90000000000000002D);

ai1[1] = i;

ai1[2] = i - (int)(((double)font1psize * 0.90000000000000002D) / 2D);

ai1[3] = i - (int)((double)font1psize * 0.90000000000000002D);

g.fillPolygon(ai, ai1, 4);

}

public void drawFillOpentria(Graphics g, int i)

{

int ai[] = new int[4];

int ai1[] = new int[4];

ai[0] = 10;

ai[1] = 10 (int)((double)font1psize * 0.69999999999999996D);

ai[2] = 10 (int)(((double)font1psize * 0.69999999999999996D) / 2D);

ai[3] = 10;

ai1[0] = i - (int)((double)font1psize * 0.69999999999999996D);

ai1[1] = i - (int)((double)font1psize * 0.69999999999999996D);

ai1[2] = i;

ai1[3] = i - (int)((double)font1psize * 0.69999999999999996D);

g.fillPolygon(ai, ai1, 4);

}

public void start()

{

thread = new Thread(this);

thread.start();

}

public void run()

{

do

{

try

{

Thread.currentThread();

Thread.sleep(100L);

}

catch(InterruptedException _ex) { }

repaint();

} while(true);

}

public synchronized boolean mouseMove(Event event, int i, int j)

{

mousemoved = 1;

mousex = i;

mousey = j;

return true;

}

public void stop()

{

if(thread != null)

{

thread.stop();

thread = null;

}

}

public basictoc2()

{

buf = new char[1];

ch = new Character('/251');

fm3 = new Font("Helvectica", 0, 8);

fm = new Font("Helvectica", 0, 14);

fm2 = new Font("Helvectica", 1, 14);

basex = 35;

elems = new Vector(50, 10);

urls = new Vector(50, 10);

selhead = "";

curhead = "";

urlmsg = -1;

msg1 = "";

msg2 = "";

mt = new MediaTracker(this);

isopenfound = false;

docidx = -1;

font1psize = 12;

font2psize = 12;

spacing = 4;

spacing2 = 2;

}

static final int MAXLINES = 200;

char buf[];

Character ch;

int layoutcount;

int urlcount;

String tok0;

String tok1;

String tok2;

String tok3;

int elemcount;

int txtcolor;

int highlightcolor;

int symbolcolor;

int tailcount;

Thread thread;

Font fm3;

Font fm;

Font fm2;

int basex;

int basey;

int prev_x;

int prev_y;

int mousemoved;

int mousex;

int mousey;

Image offscreen;

Dimension offscreensize;

Graphics offgraphics;

Vector elems;

Vector urls;

String selhead;

String curhead;

int headisopen;

int gifw;

int gifh;

int openmsg;

int closemsg;

int urlmsg;

String msg1;

String msg2;

String txtfile;

String isimgstrip;

String bgimgfile;

MediaTracker mt;

boolean isopenfound;

int docidx;

StringTokenizer st;

StringTokenizer st2;

StringTokenizer st3;

StringTokenizer sg;

int fontpointsize;

Image bgimg;

int font1psize;

int font2psize;

int spacing;

int spacing2;

}

import java.awt.Image;

class basictoc2Rec

{

public basictoc2Rec()

{

id = "";

name = "";

helpstr = "";

urlstr = "";

head = "";

altstr = "";

target = "";

level = 0;

itemh = 0;

}

public basictoc2Rec(String s, String s1, String s2)

{

helpstr = s;

urlstr = s1;

altstr = s2;

}

void setxny(int i, int j)

{

elemx = i;

elemy = j;

}

public String id;

public String name;

public String helpstr;

public String urlstr;

public String head;

public String altstr;

public String target;

public Image defimg;

public Image altimg;

public Image img;

public int elemx;

public int elemy;

public int level;

public int itemh;

public boolean isopen;

public boolean ishead;

public boolean isvisible;

}