// CbScrollbar.java
// A drop-in replacement for the AWT scrollbar class, with callbacks
// and a nicer look. This scrollbar is typically used to display some
// fraction of a list of items, with values ranging from min to max.
// The lvisible parameter determines how many of the list are lvisible
// at any one time. The value of the scrollbar ranges from min to
// max-lvisible+1 (the highest position in the list to start displaying)
import java.awt.*;
public class CbScrollbar extends Panel
{
static final int VERTICAL = 0;
static final int HORIZONTAL = 1;
CbScrollbarCallback callback; // who to call back to
boolean inside, indent;
int orient; // horizontal or vertical?
int value; // position
int lvisible; // the number of lines lvisible
int num; // total number of lines
int lineinc = 1; // how much the arrow buttons move by
Color lc1 = Util.light_edge, lc2 = Util.body, lc3 = Util.dark_edge;
Color hc1 = Util.light_edge_hi, hc2 = Util.body_hi, hc3 = Util.dark_edge_hi;
Color bc = Util.dark_bg;
int y1, y2, x1, x2, drag;
CbScrollbarArrow arrow1, arrow2;
CbScrollbar(int o, CbScrollbarCallback cb)
{
this(o, 0, 1, 1, cb);
}
/**Create a new scrollbar
*/
CbScrollbar(int o, int v, int vis, int n, CbScrollbarCallback cb)
{
setValues(v, vis, n);
orient = o;
callback = cb;
setLayout(null);
if (orient == VERTICAL) {
add(arrow1 = new CbScrollbarArrow(this, 0));
add(arrow2 = new CbScrollbarArrow(this, 1));
}
else {
add(arrow1 = new CbScrollbarArrow(this, 2));
add(arrow2 = new CbScrollbarArrow(this, 3));
}
}
/**Set the current scrollbar parameters
* @param v Current position
* @param vis Number of lines lvisible
* @param n Total number of lines
*/
public void setValues(int v, int vis, int n)
{
value = v;
lvisible = vis;
num = n;
if (lvisible > num) lvisible = num;
checkValue();
repaint();
}
public int getValue() { return value; }
public void setValue(int v)
{
value = v;
checkValue();
repaint();
}
private void checkValue()
{
if (value < 0) value = 0;
else if (value > num-lvisible) value = num-lvisible;
}
public void paint(Graphics g)
{
if (num == 0) return;
int w = size().width, h = size().height;
boolean ins = inside && !(arrow1.inside || arrow2.inside);
Color c1 = ins ? hc1 : lc1, c2 = ins ? hc2 : lc2,
c3 = ins ? hc3 : lc3;
g.setColor(bc);
g.fillRect(0, 0, w, h);
g.setColor(c3);
g.drawLine(0, 0, w-1, 0); g.drawLine(0, 0, 0, h-1);
g.setColor(c1);
g.drawLine(w-1, h-1, w-1, 0); g.drawLine(w-1, h-1, 0, h-1);
if (orient == VERTICAL) {
int va = h-w*2;
y1 = w+va*value/num;
y2 = w+va*(value+lvisible)/num-1;
g.setColor(c2);
g.fillRect(1, y1, w-2, y2-y1);
g.setColor(indent ? c3 : c1);
g.drawLine(1, y1, w-2, y1);
g.drawLine(1, y1, 1, y2-1);
g.setColor(indent ? c1 : c3);
g.drawLine(w-2, y2-1, w-2, y1);
g.drawLine(w-2, y2-1, 1, y2-1);
if (ins) {
g.drawLine(w-3, y2-2, w-3, y1+1);
g.drawLine(w-3, y2-2, 2, y2-2);
}
}
else if (orient == HORIZONTAL) {
int va = w-h*2;
x1 = h+va*value/num;
x2 = h+va*(value+lvisible)/num-1;
g.setColor(c2);
g.fillRect(x1, 1, x2-x1, h-2);
g.setColor(indent ? c3 : c1);
g.drawLine(x1, 1, x1, h-2);
g.drawLine(x1, 1, x2-1, 1);
g.setColor(indent ? c1 : c3);
g.drawLine(x2-1, h-2, x1, h-2);
g.drawLine(x2-1, h-2, x2-1, 1);
if (ins) {
g.drawLine(x2-2, h-3, x1+1, h-3);
g.drawLine(x2-2, h-3, x2-2, 2);
}
}
}
/**Called by arrows to move the slider
*/
void arrowClick(int d)
{
int oldvalue = value;
value += d;
checkValue();
if (value != oldvalue) {
callback.moved(this, value);
repaint();
}
}
public void reshape(int nx, int ny, int nw, int nh)
{
super.reshape(nx, ny, nw, nh);
if (orient == VERTICAL) {
arrow1.reshape(1, 1, nw-2, nw-1);
arrow2.reshape(1, nh-nw-1, nw-2, nw-1);
}
else {
arrow1.reshape(1, 1, nh-1, nh-2);
arrow2.reshape(nw-nh-1, 1, nh-1, nh-2);
}
repaint();
}
public Dimension preferredSize()
{
return orient==VERTICAL ? new Dimension(16, 100)
: new Dimension(100, 16);
}
public Dimension minimumSize()
{
return preferredSize();
}
public boolean mouseDown(Event e, int mx, int my)
{
if (orient == VERTICAL) {
// move up/down one page, or start dragging
if (my < y1) arrowClick(-lvisible);
else if (my > y2) arrowClick(lvisible);
else {
indent = true;
drag = my-y1;
repaint();
}
}
else {
// move left/right one page, or start dragging
if (mx < x1) arrowClick(-lvisible);
else if (mx > x2) arrowClick(lvisible);
else {
indent = true;
drag = mx-x1;
repaint();
}
}
return true;
}
public boolean mouseDrag(Event e, int mx, int my)
{
if (indent) {
int w = size().width, h = size().height;
int oldvalue = value;
if (orient == VERTICAL) {
int va = h-w*2, ny = my-drag-w;
value = ny*num/va;
}
else {
int va = w-h*2, nx = mx-drag-h;
value = nx*num/va;
}
checkValue();
if (value != oldvalue) {
callback.moving(this, value);
repaint();
}
}
return indent;
}
public boolean mouseUp(Event e, int mx, int my)
{
if (indent) {
indent = false;
repaint();
callback.moved(this, value);
return true;
}
return false;
}
/*
public boolean mouseEnter(Event e, int mx, int my)
{
inside = true;
repaint();
return true;
}
public boolean mouseExit(Event e, int mx, int my)
{
inside = false;
repaint();
return true;
}
*/
}
class CbScrollbarArrow extends Canvas implements Runnable
{
int mode;
CbScrollbar scrollbar;
boolean inside, indent;
Thread th;
CbScrollbarArrow(CbScrollbar p, int m)
{
scrollbar = p;
mode = m;
}
public void paint(Graphics g)
{
int w = size().width, h = size().height;
Color c1 = inside ? scrollbar.hc1 : scrollbar.lc1,
c2 = inside ? scrollbar.hc2 : scrollbar.lc2,
c3 = inside ? scrollbar.hc3 : scrollbar.lc3;
g.setColor(scrollbar.bc);
g.fillRect(0, 0, w, h);
int xp[] = new int[3], yp[] = new int[3];
// blank, dark, light
if (mode == 0) {
// up arrow
xp[0] = w/2; xp[1] = w-1; xp[2] = 0;
yp[0] = 0; yp[1] = h-1; yp[2] = h-1;
}
else if (mode == 1) {
// down arrow
xp[0] = 0; xp[1] = w/2; xp[2] = w-1;
yp[0] = 0; yp[1] = h-1; yp[2] = 0;
}
else if (mode == 2) {
// left arrow
xp[0] = 0; xp[1] = w-1; xp[2] = w-1;
yp[0] = h/2; yp[1] = h-1; yp[2] = 0;
}
else if (mode == 3) {
// right arrow
xp[0] = 0; xp[1] = w-1; xp[2] = 0;
yp[0] = 0; yp[1] = h/2; yp[2] = h-1;
}
g.setColor(c2);
g.fillPolygon(xp, yp, 3);
g.setColor(indent ? c1 : c3);
g.drawLine(xp[1], yp[1], xp[2], yp[2]);
g.setColor(indent ? c3 : c1);
g.drawLine(xp[0], yp[0], xp[2], yp[2]);
}
public boolean mouseDown(Event e, int mx, int my)
{
indent = true;
repaint();
(th = new Thread(this)).start();
return true;
}
public boolean mouseUp(Event e, int mx, int my)
{
indent = false;
repaint();
if (th != null) th.stop();
return true;
}
/**Thread for doing repeated scrolling
*/
public void run()
{
int stime = 500;
while(true) {
scrollbar.arrowClick(mode%2 == 0 ? -1 : 1);
try { Thread.sleep(stime); } catch(Exception e) { }
stime = 100;
}
}
}
// CbScrollbarCallback
// Methods for reporting the movement of the scrollbar to another object
interface CbScrollbarCallback
{
/**Called when the scrollbar stops moving. This happens when an
* arrow is clicked, the scrollbar is moved by a page, or the user
* lets go of the scrollbar after dragging it.
* @param sb The scrollar that has been moved
* @param v The new value
*/
void moved(CbScrollbar sb, int v);
/**Called upon every pixel movement of the scrollbar when it is
* being dragged, but NOT when moved() is called.
* @param sb The scrollar that has been moved
* @param v The new value
*/
void moving(CbScrollbar sb, int v);
}
y~or5J ={Eeu磝Qk ᯘG{?+]ן?wM3X^歌>{7پK>on\jy R g/=fOroNVv~Y+ NGuÝHWyw[eQʨSb> >}Gmx[o[<{Ϯ_qF vM IENDB`
