// MultiColumn
// A List box that supports multiple columns.
import java.awt.*;
import java.util.Vector;
public class MultiColumn extends BorderPanel implements CbScrollbarCallback
{
MultiColumnCallback callback; // what to call back to
String title[]; // column titles
boolean adjustable = true;
boolean drawlines = true;
Color colors[][] = null;
boolean enabled = true;
boolean multiselect = false;
int cpos[]; // column x positions
float cwidth[]; // proportional column widths
Vector list[]; // columns of the list
CbScrollbar sb; // scrollbar at the right side
int width, height; // size, minus the scrollbar
Insets in; // used space around the border
int sbwidth; // width of the scrollbar
int th; // height of title bar
Image bim; // backing image
Graphics bg; // backing graphics
Font font = new Font("timesRoman", Font.PLAIN, 12);
FontMetrics fnm; // drawing font size
int coldrag = -1; // column being resized
int sel = -1; // selected row
int sels[] = new int[0]; // all selected rows
int top = 0; // first row displayed
long last; // last mouse click time
int rowh = 16; // row height
Event last_event; // last event that triggered callback
int sortcol; // Column currently being sorted
int sortdir; // Sort direction (0=none, 1=up, 2=down)
// Create a new list with the given column titles
MultiColumn(String t[])
{
super(3, Util.dark_edge_hi, Util.body_hi);
title = new String[t.length];
for(int i=0; i<t.length; i++)
title[i] = t[i];
list = new Vector[t.length];
for(int i=0; i<t.length; i++)
list[i] = new Vector();
cwidth = new float[t.length];
for(int i=0; i<t.length; i++)
cwidth[i] = 1.0f/t.length;
cpos = new int[t.length+1];
setLayout(null);
sb = new CbScrollbar(CbScrollbar.VERTICAL, this);
add(sb);
}
// Create a new list that calls back to the given object on
// single or double clicks.
MultiColumn(String t[], MultiColumnCallback c)
{
this(t);
callback = c;
}
// addItem
// Add a row to the list
void addItem(Object item[])
{
for(int i=0; i<title.length; i++)
list[i].addElement(item[i]);
repaint();
compscroll();
}
// addItems
// Add several rows to the list
void addItems(Object item[][])
{
for(int i=0; i<item.length; i++)
for(int j=0; j<title.length; j++)
list[j].addElement(item[i][j]);
repaint();
compscroll();
}
// modifyItem
// Changes one row of the table
void modifyItem(Object item[], int row)
{
for(int i=0; i<title.length; i++)
list[i].setElementAt(item[i], row);
repaint();
compscroll();
}
// getItem
// Returns the contents of a given row
Object []getItem(int n)
{
Object r[] = new Object[title.length];
for(int i=0; i<title.length; i++)
r[i] = list[i].elementAt(n);
return r;
}
// selected
// Return the most recently selected row
int selected()
{
return sel;
}
// select
// Select some row
void select(int s)
{
sel = s;
sels = new int[1];
sels[0] = s;
repaint();
}
// select
// Select multiple rows
void select(int s[])
{
if (s.length == 0) {
sel = -1;
sels = new int[0];
}
else {
sel = s[0];
sels = s;
}
repaint();
}
// allSelected
// Returns all the selected rows
int[] allSelected()
{
return sels;
}
// scrollto
// Scroll to make some row visible
void scrollto(int s)
{
int r = rows();
if (s < top || s >= top+r) {
top = s-1;
if (top > list[0].size() - r)
top = list[0].size() - r;
sb.setValue(top);
repaint();
}
}
// deleteItem
// Remove one row from the list
void deleteItem(int n)
{
for(int i=0; i<title.length; i++)
list[i].removeElementAt(n);
if (n == sel) {
// De-select deleted file
sel = -1;
}
for(int i=0; i<sels.length; i++) {
if (sels[i] == n) {
// Remove from selection list
int nsels[] = new int[sels.length-1];
if (nsels.length > 0) {
System.arraycopy(sels, 0, nsels, 0, i);
System.arraycopy(sels, i+1, nsels, i,
nsels.length-i);
sel = nsels[0];
}
break;
}
}
repaint();
compscroll();
}
// clear
// Remove everything from the list
void clear()
{
for(int i=0; i<title.length; i++)
list[i].removeAllElements();
sel = -1;
sels = new int[0];
top = 0;
repaint();
sb.setValues(0, 1, 0);
}
// setWidths
// Set the proportional widths of each column
void setWidths(float w[])
{
for(int i=0; i<title.length; i++)
cwidth[i] = w[i];
respace();
repaint();
}
/**Turns on or off the user's ability to adjust column widths
* @param a Can adjust or not?
*/
void setAdjustable(boolean a)
{
adjustable = a;
}
/**Turns on or off the drawing of column lines
* @param d Draw lines or not?
*/
void setDrawLines(boolean d)
{
drawlines = d;
}
/**Sets the array of colors used to draw text items.
* @param c The color array (in row/column order), or null to
* use the default
*/
void setColors(Color c[][])
{
colors = c;
repaint();
}
// Turns on or off multi-row selection with ctrl and shift
void setMultiSelect(boolean m)
{
multiselect = m;
}
// Enables the entire list
public void enable()
{
enabled = true;
sb.enable();
repaint();
}
// Disables the entire list
public void disable()
{
enabled = false;
sb.disable();
repaint();
}
// Sets or turns off the sort indication arrow for a column
// Direction 0 = None, 1 = Up arrow, 2 = Down arrow
public void sortingArrow(int col, int dir)
{
sortcol = col;
sortdir = dir;
repaint();
}
public void setFont(Font f)
{
font = f;
bim = null;
repaint();
}
// Returns the total number of rows
public int count()
{
return list[0].size();
}
// reshape
// Called when this component gets resized
public void reshape(int nx, int ny, int nw, int nh)
{
if (nw != width+sbwidth || nh != height) {
in = insets();
sbwidth = sb.minimumSize().width;
width = nw-sbwidth - (in.left + in.right);
height = nh - (in.top + in.bottom);
sb.reshape(width+in.left, in.top, sbwidth, height);
respace();
// Force creation of a new backing image and re-painting
bim = null;
repaint();
compscroll();
}
super.reshape(nx, ny, nw, nh);
}
// respace
// Compute pixel column widths from proportional widths
void respace()
{
cpos[0] = 0;
for(int i=0; i<title.length; i++)
cpos[i+1] = cpos[i] + (int)(width*cwidth[i]);
}
// paint
// Blit the backing image to the front
public void paint(Graphics g)
{
super.paint(g);
if (bim == null) {
// This is the first rendering
bim = createImage(width, height);
bg = bim.getGraphics();
bg.setFont(font);
fnm = bg.getFontMetrics();
th = fnm.getHeight() + 4;
render();
compscroll();
}
g.drawImage(bim, in.left, in.top, this);
}
// update
// Called sometime after repaint()
public void update(Graphics g)
{
if (fnm != null) {
render();
paint(g);
}
}
// render
// Re-draw the list into the backing image
void render()
{
int fh = fnm.getHeight(), // useful font metrics
fd = fnm.getDescent(),
fa = fnm.getAscent();
int bot = Math.min(top+rows()-1, list[0].size()-1);
// Clear title section and list
bg.setColor(Util.body);
bg.fillRect(0, 0, width, th);
bg.setColor(Util.light_bg);
bg.fillRect(0, th, width, height-th);
Color lighterGray = Util.body_hi;
if (enabled) {
// Mark the selected rows
for(int i=0; i<sels.length; i++) {
if (sels[i] >= top && sels[i] <= bot) {
bg.setColor(sels[i] == sel ? Util.body
: lighterGray);
bg.fillRect(0, th+(sels[i]-top)*rowh,
width, rowh);
}
}
}
// Draw each column
for(int i=0; i<title.length; i++) {
int x = cpos[i], w = cpos[i+1]-x-1;
// Column title
bg.setColor(Util.light_edge);
bg.drawLine(x, 0, x+w, 0);
bg.drawLine(x, 1, x+w-1, 1);
bg.drawLine(x, 0, x, th-1);
bg.drawLine(x+1, 0, x+1, th-2);
bg.setColor(Util.dark_edge);
bg.drawLine(x, th-1, x+w, th-1);
bg.drawLine(x, th-2, x+w-1, th-2);
bg.drawLine(x+w, th-1, x+w, 0);
bg.drawLine(x+w-1, th-1, x+w-1, 1);
int tw = fnm.stringWidth(title[i]);
if (tw < w-6)
bg.drawString(title[i], x+(w-tw)/2, th-fd-2);
// Sorting arrow
int as = th-8;
if (sortcol == i && sortdir == 1) {
bg.setColor(Util.light_edge);
bg.drawLine(x+4, th-5, x+4+as, th-5);
bg.drawLine(x+4+as, th-5, x+4+as/2, th-5-as);
bg.setColor(Util.dark_edge);
bg.drawLine(x+4+as/2, th-5-as, x+4, th-5);
}
else if (sortcol == i && sortdir == 2) {
bg.setColor(Util.light_edge);
bg.drawLine(x+4+as/2, th-5, x+4+as, th-5-as);
bg.setColor(Util.dark_edge);
bg.drawLine(x+4, th-5-as, x+4+as, th-5-as);
bg.drawLine(x+4, th-5-as, x+4+as/2, th-5);
}
// Column items
if (drawlines) {
bg.setColor(Util.body);
bg.drawLine(x+w-1, th, x+w-1, height);
bg.setColor(Util.dark_edge);
bg.drawLine(x+w, th, x+w, height);
}
for(int j=top; j<=bot; j++) {
Object o = list[i].elementAt(j);
if (o instanceof String) {
// Render string in column
String s = (String)o;
while(fnm.stringWidth(s) > w-3)
s = s.substring(0, s.length()-1);
if (!enabled)
bg.setColor(Util.body);
else if (colors != null)
bg.setColor(colors[j][i]);
bg.drawString(s, x+1, th+(j+1-top)*rowh-fd);
}
else if (o instanceof Image) {
// Render image in column
Image im = (Image)o;
bg.drawImage(im, x+1, th+(j-top)*rowh, this);
}
}
}
}
// mouseDown
// Select a list item or a column to drag
public boolean mouseDown(Event e, int x, int y)
{
if (!enabled) {
return true;
}
x -= in.left;
y -= in.top;
coldrag = -1;
if (y < th) {
// Click in title bar
for(int i=0; i<title.length; i++) {
if (adjustable && i > 0 && Math.abs(cpos[i] - x) < 3) {
// clicked on a column separator
coldrag = i;
}
else if (x >= cpos[i] && x < cpos[i+1]) {
// clicked in a title
callback.headingClicked(this, i);
}
}
}
else {
// Item chosen from list
int row = (y-th)/rowh + top;
if (row < list[0].size()) {
// Double-click?
boolean dclick = false;
if (e.when-last < 1000 && sel == row)
dclick = true;
else
last = e.when;
if (e.shiftDown() && multiselect && sel != -1) {
// Select all from last selection to this one
int zero = sels[0];
if (zero < row) {
sels = new int[row-zero+1];
for(int i=zero; i<=row; i++)
sels[i-zero] = i;
}
else {
sels = new int[zero-row+1];
for(int i=zero; i>=row; i--)
sels[zero-i] = i;
}
}
else if (e.controlDown() && multiselect) {
// Add this one to selection
int nsels[] = new int[sels.length + 1];
System.arraycopy(sels, 0, nsels, 0,sels.length);
nsels[sels.length] = row;
sels = nsels;
}
else {
// Select one row only, and de-select others
sels = new int[1];
sels[0] = row;
}
sel = row;
repaint();
last_event = e;
if (callback != null) {
// Callback the right function
if (dclick) callback.doubleClick(this, row);
else callback.singleClick(this, row);
}
else {
// Send an event
getParent().postEvent(
new Event(this,
Event.ACTION_EVENT,
dclick?"Double":"Single"));
}
}
}
return true;
}
// mouseDrag
// If a column is selected, change it's width
public boolean mouseDrag(Event e, int x, int y)
{
if (!enabled) {
return true;
}
x -= in.left;
y -= in.top;
if (coldrag != -1) {
if (x > cpos[coldrag-1]+3 && x < cpos[coldrag+1]-3) {
cpos[coldrag] = x;
cwidth[coldrag-1] = (cpos[coldrag]-cpos[coldrag-1]) /
(float)width;
cwidth[coldrag] = (cpos[coldrag+1]-cpos[coldrag]) /
(float)width;
repaint();
}
}
return true;
}
public void moved(CbScrollbar s, int v)
{
moving(s, v);
}
public void moving(CbScrollbar s, int v)
{
top = sb.getValue();
compscroll();
repaint();
}
// compscroll
// Re-compute the size of the scrollbar
private void compscroll()
{
if (fnm == null)
return; // not visible
int r = rows();
int c = list[0].size() - r;
sb.setValues(top, r==0?1:r, list[0].size());
}
// rows
// Returns the number of rows visible in the list
private int rows()
{
return Math.min(height/rowh - 1, list[0].size());
}
public Dimension minimumSize()
{
return new Dimension(400, 100);
}
public Dimension preferredSize()
{
return minimumSize();
}
}
// MultiColumnCallback
// Objects implementing this interface can be passed to the MultiColumn
// class, to have their singleClick() and doubleClick() functions called in
// response to single or double click in the list.
interface MultiColumnCallback
{
// singleClick
// Called on a single click on a list item
void singleClick(MultiColumn list, int num);
// doubleClick
// Called upon double-clicking on a list item
void doubleClick(MultiColumn list, int num);
// headingClicked
// Called when a column heading is clicked on
void headingClicked(MultiColumn list, int col);
}
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