Emanonk
Reputation: 172
Change background color of JTable row based on column value issue
Based on this question I did this:
public class ShowTicketPlanning extends javax.swing.JFrame {
private static String prevTicket="";
private static int color=1;
public ShowTicketPlanning() {
initComponents();
for (int i = 0; i < C.GameList.size(); i++) {
gameSelectGameCB.addItem(C.GameList.get(i).printForList());
}
}
private void gameSelectGameCBActionPerformed(java.awt.event.ActionEvent evt) {
int ind = gameSelectGameCB.getSelectedIndex();
if (C.GameList.size() > 0) {
DefaultTableModel tmodel = (DefaultTableModel) dbgPlanTBL.getModel();
while (tmodel.getRowCount() > 0) {
tmodel.removeRow(0);
}
String columnNames[] = new String[C.DBGList.get(ind).getDrawDayList().size()];
int gameDrawSize = C.DBGList.get(ind).getDrawDayList().size();
for (int z = 0; z < gameDrawSize; z++) {
columnNames[z] = C.DBGList.get(ind).getDrawDayList().get(z).getDrawNumber() + ":" + C.DBGList.get(ind).getDrawDayList().get(z).getCdc() + ":" + ES.dayToShortDay(C.DBGList.get(ind).getDrawDayList().get(z).getDay());
}
String dataValues[][] = {};
DefaultTableModel model = new DefaultTableModel(dataValues, columnNames);
dbgPlanTBL.setModel(model);
for (int t = 0; t < C.TicketList.size(); t++) {//for all tickets
for (int b = 0; b < C.TicketList.get(t).getBoardList().size(); b++) {
Object[] ob = new Object[gameDrawSize];
for (int brpd = 0; brpd < C.TicketList.get(t).getBoardList().get(b).getBoardResultPerDrawList().size(); brpd++) {
int d = C.TicketList.get(t).getBoardList().get(b).getBoardResultPerDrawList().get(brpd).getDrawIndex();
if (C.DBGList.get(ind).isHasRaffle()) {
ob[d] = C.TicketList.get(t).getTicketRefName() + ":" + b
+ ":" + C.TicketList.get(t).getBoardList().get(b).getBoardResultPerDrawList().get(brpd).getNumberResult()
+ ":" + C.TicketList.get(t).getBoardList().get(b).getBoardResultPerDrawList().get(brpd).getRaffleResult();
} else {
ob[d] = C.TicketList.get(t).getTicketRefName() + ":" + b
+ ":" + C.TicketList.get(t).getBoardList().get(b).getBoardResultPerDrawList().get(brpd).getNumberResult();
}
}
model.addRow(ob);
}
}
DefaultTableModel amodel = (DefaultTableModel) dbgPlanTBL.getModel();
int tableSize = dbgPlanTBL.getRowCount();
//System.out.println("rows:"+tableSize);
int tableCol = dbgPlanTBL.getColumnCount();
//System.out.println("cols:"+tableCol);
for (int r = 0; r < tableSize; r++) {
for (int col = 0; col < tableCol; col++) {
if (amodel.getValueAt(r, col) == null) {
} else {
dbgPlanTBL.setDefaultRenderer(Object.class, new ShowTicketPlanning.CustomRenderer());
dbgPlanTBL.getCellEditor(r, col).getTableCellEditorComponent(dbgPlanTBL, dbgPlanTBL.getValueAt(r, col), true, r, col).setForeground(Color.red);
}
}
}
//define column width..............
TableColumnModel tcm = dbgPlanTBL.getColumnModel();
for (int i = 0; i < (tcm.getColumnCount()); i++) {
tcm.getColumn(i).setPreferredWidth(120);
}
dbgPlanTBL.setDefaultRenderer(Object.class, new ShowTicketPlanning.CustomRenderer());
}
}
class CustomRenderer extends DefaultTableCellRenderer {
public Component getTableCellRendererComponent(JTable table, Object value,boolean isSelected, boolean hasFocus, int row, int column) {
Component c = super.getTableCellRendererComponent(table, value, isSelected, hasFocus, row, column);
if (value == null) {
setBackground(new java.awt.Color(255, 255, 255));
} else {
StringTokenizer st2 = new StringTokenizer(value.toString(), ":");
String ref = st2.nextElement().toString();
if (prevTicket.equals(ref)) {
if (color == 1) {
setBackground(new java.awt.Color(204, 204, 204));
} else {
setBackground(new java.awt.Color(255, 255, 255));
}
} else {
if (color == 1) {
color = 2;
} else {
color = 1;
}
if (color == 1) {
setBackground(new java.awt.Color(204, 204, 204));
} else {
setBackground(new java.awt.Color(255, 255, 255));
}
}
prevTicket=ref;
}
return c;
}
}
So I have tickets that each ticket has more than one board. And I want to change color per ticket.
Result:
The colors are correct, however after scrolling the colors become irregular as the following image.
Note: Each "ticket0, ticket1, ticket2" etc should have alternating colors.
Upvotes: 1
Views: 548
Answers (1)
TT.
Reputation: 16146
Feel free to check out how this snippet solves this problem and apply it in your own program.
I'll have to disclaim this by saying that I'm not sure that this is the best way to do this, but it works in the sense that it doesn't have the odd behavior that you are describing (row coloring getting messed up when scrolling). I also added some code to account for sorting events and inserting/deleting/updating rows.
My snippet keeps track of colors in an array, so once a color is established for a row it doesn't establish it again. The renderer just gets the color from the color store.
For explanation of what the snippet does, see the comments inside.
import java.awt.*;
import java.awt.event.*;
import java.util.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.table.*;
public class TableWithAlternatingColorsExample {
@SuppressWarnings("serial")
private static class AlternatingColorOnKeyRenderer extends DefaultTableCellRenderer {
/* The alternating colors */
public static final Color color1 = new Color(204,204,204);
public static final Color color2 = new Color(255,255,255);
/** The model index of the key column, ie the model column from which the key is derived. */
public static final int modelKeyColId = 0;
/** The color store that stores the colors for each row in the view.
* Indexed with view index to retrieve color for a row in the view. */
private ArrayList<Color> colorStore = new ArrayList<>( );
/** Reset all colors in the color store. */
public void resetAllColors() {
colorStore = new ArrayList<>(Math.max(10,colorStore.size()));
}
/** Reset all colors in the color store from a certain view index on. */
public void resetColorsFrom(int row) {
if(row==0)
resetAllColors();
else {
ArrayList<Color> retainedColors = new ArrayList<>(Math.max(10,colorStore.size()));
retainedColors.addAll(colorStore.subList(0,Math.min(row-1,colorStore.size()-1))); // copy retained colors
colorStore = retainedColors;
}
}
/** Determines the key value from a cell value. */
private Object getCellKeyVal(Object cellValue) {
return new StringTokenizer(cellValue.toString(),":").nextElement();
}
/** Retrieves the key value for a certain row. */
private Object getRowKeyVal(JTable t,int viewRowId) {
int modelRowId = t.convertRowIndexToModel(viewRowId); // convert row view index to model index to index the model
Object cellValue = t.getModel().getValueAt(modelRowId,modelKeyColId); // get cell value from model, because the column might not be present in the view
return getCellKeyVal(cellValue);
}
/** Prepares the color store for a certain row in the view.
* After calling this method colors for the range [0,row] will be present in the color store.
* Call this method to ensure that <i>colorStore.get(row)</i> will return a color. */
private void prepareColorStore(JTable t,int row) {
if(colorStore.size()>row) return; // color already present for row
if(colorStore.isEmpty()) colorStore.add(color1); // if color store empty, start with the first color
if(row==0) return;
Object curKeyVal = getRowKeyVal(t,colorStore.size()-1);
while(colorStore.size()<=row) { // add colors until color present for row
Object prevKeyVal = curKeyVal;
curKeyVal = getRowKeyVal(t,colorStore.size());
if(prevKeyVal.equals(curKeyVal)) // compare key values between current and previous row
colorStore.add(colorStore.get(colorStore.size()-1)); // add previous color in store when key values are equal
else if(colorStore.get(colorStore.size()-1)==color1) // reference compare because color instances are fixed
colorStore.add(color2); // add alternating color when key values differ
else
colorStore.add(color1);
}
}
@Override
public Component getTableCellRendererComponent(JTable table,Object value,boolean isSelected,boolean hasFocus,int row,int column) {
Component c = super.getTableCellRendererComponent(table,value,isSelected,hasFocus,row,column);
if(!table.isRowSelected(row)) {
prepareColorStore(table,row); // ensure color is present for row
c.setBackground(colorStore.get(row)); // set color from color store
}
return c;
}
};
private static JTable createTable() {
Vector<Vector<Object>> rowData = new Vector<>( Arrays.asList(
new Vector<>(Arrays.asList(new Object[]{"ticket0:0::","ticket0:0::","ticket0:0::","ticket0:0::","ticket0:0::","ticket0:0::","ticket0:0::","ticket0:0::"})),
new Vector<>(Arrays.asList(new Object[]{"ticket25:1::","ticket25:1::","ticket25:1::","ticket25:1::","ticket25:1::","ticket25:1::","ticket25:1::","ticket25:1::"})),
new Vector<>(Arrays.asList(new Object[]{"ticket0:1::","ticket0:1::","ticket0:1::","ticket0:1::","ticket0:1::","ticket0:1::","ticket0:1::","ticket0:1::"})),
new Vector<>(Arrays.asList(new Object[]{"ticket1:0::","ticket1:0::","ticket1:0::","ticket1:0::","ticket1:0::","ticket1:0::","ticket1:0::","ticket1:0::"})),
new Vector<>(Arrays.asList(new Object[]{"ticket1:1::","ticket1:1::","ticket1:1::","ticket1:1::","ticket1:1::","ticket1:1::","ticket1:1::","ticket1:1::"})),
new Vector<>(Arrays.asList(new Object[]{"ticket10:0::","ticket10:0::","ticket10:0::","ticket10:0::","ticket10:0::","ticket10:0::","ticket10:0::","ticket10:0::"})),
new Vector<>(Arrays.asList(new Object[]{"ticket10:1::","ticket10:1::","ticket10:1::","ticket10:1::","ticket10:1::","ticket10:1::","ticket10:1::","ticket10:1::"})),
new Vector<>(Arrays.asList(new Object[]{"ticket11:0::","ticket11:0::","ticket11:0::","ticket11:0::","ticket11:0::","ticket11:0::","ticket11:0::","ticket11:0::"})),
new Vector<>(Arrays.asList(new Object[]{"ticket11:1::","ticket11:1::","ticket11:1::","ticket11:1::","ticket11:1::","ticket11:1::","ticket11:1::","ticket11:1::"})),
new Vector<>(Arrays.asList(new Object[]{"ticket12:0::","ticket12:0::","ticket12:0::","ticket12:0::","ticket12:0::","ticket12:0::","ticket12:0::","ticket12:0::"})),
new Vector<>(Arrays.asList(new Object[]{"ticket12:1::","ticket12:1::","ticket12:1::","ticket12:1::","ticket12:1::","ticket12:1::","ticket12:1::","ticket12:1::"})),
new Vector<>(Arrays.asList(new Object[]{"ticket13:0::","ticket13:0::","ticket13:0::","ticket13:0::","ticket13:0::","ticket13:0::","ticket13:0::","ticket13:0::"})),
new Vector<>(Arrays.asList(new Object[]{"ticket13:1::","ticket13:1::","ticket13:1::","ticket13:1::","ticket13:1::","ticket13:1::","ticket13:1::","ticket13:1::"})),
new Vector<>(Arrays.asList(new Object[]{"ticket14:0::","ticket14:0::","ticket14:0::","ticket14:0::","ticket14:0::","ticket14:0::","ticket14:0::","ticket14:0::"})),
new Vector<>(Arrays.asList(new Object[]{"ticket17:0::","ticket17:0::","ticket17:0::","ticket17:0::","ticket17:0::","ticket17:0::","ticket17:0::","ticket17:0::"})),
new Vector<>(Arrays.asList(new Object[]{"ticket14:1::","ticket14:1::","ticket14:1::","ticket14:1::","ticket14:1::","ticket14:1::","ticket14:1::","ticket14:1::"})),
new Vector<>(Arrays.asList(new Object[]{"ticket15:0::","ticket15:0::","ticket15:0::","ticket15:0::","ticket15:0::","ticket15:0::","ticket15:0::","ticket15:0::"})),
new Vector<>(Arrays.asList(new Object[]{"ticket15:1::","ticket15:1::","ticket15:1::","ticket15:1::","ticket15:1::","ticket15:1::","ticket15:1::","ticket15:1::"})),
new Vector<>(Arrays.asList(new Object[]{"ticket16:0::","ticket16:0::","ticket16:0::","ticket16:0::","ticket16:0::","ticket16:0::","ticket16:0::","ticket16:0::"})),
new Vector<>(Arrays.asList(new Object[]{"ticket16:1::","ticket16:1::","ticket16:1::","ticket16:1::","ticket16:1::","ticket16:1::","ticket16:1::","ticket16:1::"}))
));
Vector<Object> colData = new Vector<>(Arrays.asList(new Object[]{"1:103:Wed","2:106:Sat","3:110:Wed","4:110:Sat","5:117:Wed","6:120:Sat","7:124:Wed","8:127:Sat"}));
final JTable t = new JTable(rowData,colData);
DefaultTableCellRenderer tcr = new AlternatingColorOnKeyRenderer();
Enumeration<TableColumn> e = t.getColumnModel().getColumns();
while(e.hasMoreElements())
e.nextElement().setCellRenderer(tcr); // all table columns share the same AlternatingColorOnKeyRenderer instance
t.setAutoCreateRowSorter(true);
/* When the row sorter changes, reset all colors in the color store.
* When row sorting changes, the row view indices will point to different rows in the model, so the color store needs to be reset. */
t.getRowSorter().addRowSorterListener(new RowSorterListener() {
@Override
public void sorterChanged(RowSorterEvent e) {
((AlternatingColorOnKeyRenderer) t.getColumnModel().getColumn(0).getCellRenderer()).resetAllColors(); // all rows share the same AlternatingColorOnKeyRenderer instance, so pick the renderer from the first column and reset color store
}
});
/* Add a model listener to listen for inserted/deleted/updated rows. When rows are inserted/deleted/updated, the row colors could change for subsequent rows.
* Determines the minimum view index for the inserted/deleted/updated rows, then resets the color store from that view index on. */
t.getModel().addTableModelListener(new TableModelListener() {
@Override
public void tableChanged(TableModelEvent e) {
int minViewId;
switch(e.getType()) {
case TableModelEvent.INSERT:
case TableModelEvent.DELETE:
minViewId = Integer.MAX_VALUE;
for(int r=e.getFirstRow();r<=e.getLastRow();++r) { // determine minimum view index for inserted/deleted rows
int viewId=t.convertRowIndexToView(r); // convert model index to view index
if(viewId>=0 && viewId<minViewId) // due to filtering, it is possible that inserted/deleted rows are not visible in the view (convert will return -1 in that case)
minViewId=viewId;
}
if(minViewId!=Integer.MAX_VALUE) // if any of the inserted/deleted rows were visible, reset the color store from the minimum view index on
((AlternatingColorOnKeyRenderer) t.getColumnModel().getColumn(0).getCellRenderer()).resetColorsFrom(minViewId);
break;
case TableModelEvent.UPDATE:
int r = e.getFirstRow();
if(r==TableModelEvent.HEADER_ROW)
return; // outside scope for this example
if(e.getColumn()!=TableModelEvent.ALL_COLUMNS && e.getColumn()!=AlternatingColorOnKeyRenderer.modelKeyColId)
return; // only listen for updates in the key column
minViewId = Integer.MAX_VALUE;
for( ;r<=e.getLastRow();++r) { // determine minimum view index for updated rows
int viewId=t.convertRowIndexToView(r); // convert model index to view index
if(viewId>=0 && viewId<minViewId) // due to filtering, it is possible that updated rows are not visible in the view (convert will return -1 in that case)
minViewId=viewId;
}
if(minViewId!=Integer.MAX_VALUE) { // if any of the updated rows were visible, reset the color store from the minimum view index on & repaint
((AlternatingColorOnKeyRenderer) t.getColumnModel().getColumn(0).getCellRenderer()).resetColorsFrom(minViewId);
t.repaint(); // repaint necessary for UPDATE events to update colors in the view
}
break;
}
}
});
return t;
}
protected static JButton createAddButton(final JTable t) {
JButton button = new JButton("Add row randomly");
button.addActionListener(new ActionListener() {
@SuppressWarnings("unchecked")
@Override
public void actionPerformed(ActionEvent e) {
DefaultTableModel dtm = (DefaultTableModel) t.getModel();
Vector<Object> newRow = new Vector<>(Arrays.asList(new Object[]{"ticket77:0::","ticket77:0::","ticket77:0::","ticket77:0::","ticket77:0::","ticket77:0::","ticket77:0::","ticket77:0::"}));
int index = new Random().nextInt(t.getRowCount()+1); // random index to insert
if(index<t.getRowCount())
dtm.getDataVector().add(index,newRow); // use the dataVector from DefaultTableModel to insert
else
dtm.getDataVector().add(newRow);
dtm.fireTableRowsInserted(index,index); // notify the view that a row was inserted
}
});
return button;
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
JFrame f = new JFrame();
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.setLayout(new BorderLayout());
JTable t = createTable();
f.add(new JScrollPane(t),BorderLayout.CENTER);
f.add(createAddButton(t),BorderLayout.SOUTH);
f.setSize(500, 500);
f.setVisible(true);
}
});
}
}
Upvotes: 1
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