问题：
根据列值问题更改JTable行的背景色
古棋
基于这个问题我这样做了：
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;
}
}
所以我有票，每张票都有不止一个棋盘。我想换每张票的颜色。
结果:
颜色是正确的，但是在滚动后，颜色变得不规则，如下图所示。
注：每个“ticket0、ticket1、ticket2”等应具有交替颜色。
共有1个答案
戚飞虎
请随意查看此代码段如何解决此问题，并将其应用到您自己的程序中。
我不得不否认这一点，我不确定这是最好的方法，但它的工作原理是，它没有你描述的奇怪行为（滚动时行着色变得混乱）。我还添加了一些代码来解释排序事件和插入/删除/更新行。
我的代码片段跟踪数组中的颜色，因此一旦为一行建立了颜色，就不会再次建立它。渲染器只是从颜色存储中获取颜色。
有关该代码段的作用的解释，请参见其中的注释。
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);
}
});
}
}
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