崩溃,咋获得上一个元素的背景色呢?
我要的效果是,右侧的Jlist中的元素,若是连续的(如2,3,4,5)那么他们就显示同一背景色,当出现与上面的元素不连续的元素时,其背景色与它上面的那一个元素背景色不同。只使用绿色和黄色2种背景色。我现在做的无法获得上面元素的背景色。附代码,请前辈指点import java.awt.Color;
import java.awt.Component;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;import javax.swing.DefaultListModel;
import javax.swing.JButton;
import javax.swing.JDialog;
import javax.swing.JLabel;
import javax.swing.JList;
import javax.swing.JScrollPane;
import javax.swing.ListCellRenderer;
import javax.swing.ListModel;
import javax.swing.WindowConstants;/**
*
* @author __USER__
*/
public class MyDemo extends JDialog implements ActionListener { private JList jList1;
private JButton jButton1;
private JButton jButton2;
private JList jList2;
private DefaultListModel listModel1;
private DefaultListModel listModel2;
private JButton confirmBtn;
private JScrollPane paneA;
private JScrollPane paneB; {
//Set Look & Feel
try {
javax.swing.UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel");
} catch(Exception e) {
e.printStackTrace();
}
}
/**
* Auto-generated main method to display this JFrame
*/
public static void main(String[] args) {
MyDemo inst = new MyDemo();
inst.setVisible(true);
}
public MyDemo() {
super();
initGUI();
}
private void initGUI() {
try {
setDefaultCloseOperation(WindowConstants.DISPOSE_ON_CLOSE);
paneA = new JScrollPane();
paneB = new JScrollPane();
getContentPane().setLayout(null);
getContentPane().add(paneA);
getContentPane().add(paneB);
this.setTitle("光缆熔接");
{
listModel1 = new DefaultListModel();
listModel1.addElement("1");
listModel1.addElement("2");
listModel1.addElement("3");
listModel1.addElement("4");
listModel1.addElement("5");
listModel1.addElement("6");
listModel1.addElement("7");
listModel1.addElement("8");
jList1 = new JList(listModel1);
paneA.setBounds(30, 28, 130, 250);
paneA.setViewportView(jList1);
}
{
listModel2 = new DefaultListModel();
jList2 = new JList(listModel2);
jList2.setCellRenderer(new ColorRender());
paneB.setBounds(330, 28, 130, 250);
paneB.setViewportView(jList2);
}
{
jButton1 = new JButton();
getContentPane().add(jButton1);
jButton1.setText("添加->>");;
jButton1.setBounds(210, 80, 80, 28);
jButton1.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent evt) {
jButton1ActionPerformed(evt);
}
});
}
{
jButton2 = new JButton();
getContentPane().add(jButton2);
jButton2.setText("<<-移除");
jButton2.setBounds(210, 170, 80, 28);
jButton2.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent evt) {
jButton2ActionPerformed(evt);
}
});
}
{
confirmBtn = new JButton("确定");
getContentPane().add(confirmBtn);
confirmBtn.setBounds(370, 300, 80, 28);
confirmBtn.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent evt) {
confirmBtnActionPerformed(evt);
}
});
}
pack();
setSize(500, 380);
setLocationRelativeTo(null);
} catch (Exception e) {
e.printStackTrace();
}
}
/** jList1移动到jList2*/
private void jButton1ActionPerformed(ActionEvent evt) {
if(jList1.getSelectedIndex()!=-1) {
//将光缆段A的纤芯批量加到光缆段B
Object[] items = jList1.getSelectedValues();
for (int i = 0; i < items.length; i++) {
listModel2.addElement(items[i].toString());
}
int[] index = jList1.getSelectedIndices();
for (int i = index.length -1 ; i >= 0 ; i--) {
listModel1.remove(index[i]);
}
//将纤芯升序排列
//获取listModel里的元素值
List temp = new ArrayList();
for (int i = 0; i<listModel2.size(); i++) {
temp.add(listModel2.getElementAt(i));
}
//list排序
Collections.sort(temp);
//清空
listModel2.clear();
//重新为listModel赋上排序后的值
for (Object item : temp) {
listModel2.addElement(item);
}
jList2.repaint();
}
} private void jButton2ActionPerformed(ActionEvent evt) {
Object[] items = jList2.getSelectedValues();
int[] index = jList2.getSelectedIndices();
for (int i = 0 ;i < items.length; i++) {
listModel1.addElement(items[i]);
}
for (int i = items.length - 1 ;i >= 0; i--) {
listModel2.remove(index[i]);
}
//获取listModel里的元素值
List temp = new ArrayList();
for (int i = 0; i<listModel1.size(); i++) {
temp.add(listModel1.getElementAt(i));
}
//list排序
Collections.sort(temp);
//清空
listModel1.clear();
//重新为listModel赋上排序后的值
for (Object item : temp) {
listModel1.addElement(item);
}
jList2.repaint();
}
private void confirmBtnActionPerformed(ActionEvent evt){
} @Override
public void actionPerformed(ActionEvent e) {
// TODO Auto-generated method stub
}
}class ColorRender extends JButton implements ListCellRenderer{ @Override
public Component getListCellRendererComponent(JList list, Object value,
int index, boolean isSelected, boolean cellHasFocus) {
this.setBorder(null);
setText(value.toString());
Color[] c = {Color.green,Color.yellow};
ListModel model = list.getModel();
int size = model.getSize();
int i = 0;
if(size > 0){
if(index == 0){
this.setBackground(Color.green);
}else{
int front = Integer.parseInt(model.getElementAt(index-1).toString());
int temp = Integer.parseInt(model.getElementAt(index).toString());
if(temp - front == 1){
this.setBackground(c[i]);
//background = Color.green;
}else{
i++;
this.setBackground(c[i]);
}
}
}
if(isSelected){
this.setBackground(Color.red);
//background = Color.red;
}
//setBackground(background);
return this;
}
}
我要的效果是,右侧的Jlist中的元素,若是连续的(如2,3,4,5)那么他们就显示同一背景色,当出现与上面的元素不连续的元素时,其背景色与它上面的那一个元素背景色不同。只使用绿色和黄色2种背景色。我现在做的无法获得上面元素的背景色。附代码,请前辈指点import java.awt.Color;
import java.awt.Component;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;import javax.swing.DefaultListModel;
import javax.swing.JButton;
import javax.swing.JDialog;
import javax.swing.JLabel;
import javax.swing.JList;
import javax.swing.JScrollPane;
import javax.swing.ListCellRenderer;
import javax.swing.ListModel;
import javax.swing.WindowConstants;/**
*
* @author __USER__
*/
public class MyDemo extends JDialog implements ActionListener { private JList jList1;
private JButton jButton1;
private JButton jButton2;
private JList jList2;
private DefaultListModel listModel1;
private DefaultListModel listModel2;
private JButton confirmBtn;
private JScrollPane paneA;
private JScrollPane paneB; {
//Set Look & Feel
try {
javax.swing.UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel");
} catch(Exception e) {
e.printStackTrace();
}
}
/**
* Auto-generated main method to display this JFrame
*/
public static void main(String[] args) {
MyDemo inst = new MyDemo();
inst.setVisible(true);
}
public MyDemo() {
super();
initGUI();
}
private void initGUI() {
try {
setDefaultCloseOperation(WindowConstants.DISPOSE_ON_CLOSE);
paneA = new JScrollPane();
paneB = new JScrollPane();
getContentPane().setLayout(null);
getContentPane().add(paneA);
getContentPane().add(paneB);
this.setTitle("光缆熔接");
{
listModel1 = new DefaultListModel();
listModel1.addElement("1");
listModel1.addElement("2");
listModel1.addElement("3");
listModel1.addElement("4");
listModel1.addElement("5");
listModel1.addElement("6");
listModel1.addElement("7");
listModel1.addElement("8");
jList1 = new JList(listModel1);
paneA.setBounds(30, 28, 130, 250);
paneA.setViewportView(jList1);
}
{
listModel2 = new DefaultListModel();
jList2 = new JList(listModel2);
jList2.setCellRenderer(new ColorRender());
paneB.setBounds(330, 28, 130, 250);
paneB.setViewportView(jList2);
}
{
jButton1 = new JButton();
getContentPane().add(jButton1);
jButton1.setText("添加->>");;
jButton1.setBounds(210, 80, 80, 28);
jButton1.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent evt) {
jButton1ActionPerformed(evt);
}
});
}
{
jButton2 = new JButton();
getContentPane().add(jButton2);
jButton2.setText("<<-移除");
jButton2.setBounds(210, 170, 80, 28);
jButton2.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent evt) {
jButton2ActionPerformed(evt);
}
});
}
{
confirmBtn = new JButton("确定");
getContentPane().add(confirmBtn);
confirmBtn.setBounds(370, 300, 80, 28);
confirmBtn.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent evt) {
confirmBtnActionPerformed(evt);
}
});
}
pack();
setSize(500, 380);
setLocationRelativeTo(null);
} catch (Exception e) {
e.printStackTrace();
}
}
/** jList1移动到jList2*/
private void jButton1ActionPerformed(ActionEvent evt) {
if(jList1.getSelectedIndex()!=-1) {
//将光缆段A的纤芯批量加到光缆段B
Object[] items = jList1.getSelectedValues();
for (int i = 0; i < items.length; i++) {
listModel2.addElement(items[i].toString());
}
int[] index = jList1.getSelectedIndices();
for (int i = index.length -1 ; i >= 0 ; i--) {
listModel1.remove(index[i]);
}
//将纤芯升序排列
//获取listModel里的元素值
List temp = new ArrayList();
for (int i = 0; i<listModel2.size(); i++) {
temp.add(listModel2.getElementAt(i));
}
//list排序
Collections.sort(temp);
//清空
listModel2.clear();
//重新为listModel赋上排序后的值
for (Object item : temp) {
listModel2.addElement(item);
}
jList2.repaint();
}
} private void jButton2ActionPerformed(ActionEvent evt) {
Object[] items = jList2.getSelectedValues();
int[] index = jList2.getSelectedIndices();
for (int i = 0 ;i < items.length; i++) {
listModel1.addElement(items[i]);
}
for (int i = items.length - 1 ;i >= 0; i--) {
listModel2.remove(index[i]);
}
//获取listModel里的元素值
List temp = new ArrayList();
for (int i = 0; i<listModel1.size(); i++) {
temp.add(listModel1.getElementAt(i));
}
//list排序
Collections.sort(temp);
//清空
listModel1.clear();
//重新为listModel赋上排序后的值
for (Object item : temp) {
listModel1.addElement(item);
}
jList2.repaint();
}
private void confirmBtnActionPerformed(ActionEvent evt){
} @Override
public void actionPerformed(ActionEvent e) {
// TODO Auto-generated method stub
}
}class ColorRender extends JButton implements ListCellRenderer{ @Override
public Component getListCellRendererComponent(JList list, Object value,
int index, boolean isSelected, boolean cellHasFocus) {
this.setBorder(null);
setText(value.toString());
Color[] c = {Color.green,Color.yellow};
ListModel model = list.getModel();
int size = model.getSize();
int i = 0;
if(size > 0){
if(index == 0){
this.setBackground(Color.green);
}else{
int front = Integer.parseInt(model.getElementAt(index-1).toString());
int temp = Integer.parseInt(model.getElementAt(index).toString());
if(temp - front == 1){
this.setBackground(c[i]);
//background = Color.green;
}else{
i++;
this.setBackground(c[i]);
}
}
}
if(isSelected){
this.setBackground(Color.red);
//background = Color.red;
}
//setBackground(background);
return this;
}
}
自己顶一下
无法获取上面元素的颜色,不知道该如何给当前元素赋值背景色
我的想法是,没有必要去获取上面元素的颜色,为什么去取它呢?
假设你要使用N种颜色,保存在数组中,默认使用索引为0的颜色,当序号中断时,索引加1,使用对应的颜色不就可以了吗?(索引>=数组长度时归0)
在程序中设置
Color up = Color.green;
@Override
public Component getListCellRendererComponent(JList list, Object value,
int index, boolean isSelected, boolean cellHasFocus) {
this.setBorder(null);
setText(value.toString());
Color[] c = {Color.green,Color.yellow};
ListModel model = list.getModel();
int size = model.getSize();
int i = 0;
if(size > 0){
if(index == 0){
this.setBackground(up); //这行很关键,如果设置了固定值,就会出问题,不知道为什么
}else{
int front = Integer.parseInt(model.getElementAt(index-1).toString());
int temp = Integer.parseInt(model.getElementAt(index).toString());
if(temp - front == 1){
//this.setBackground(c[i]);
this.setBackground(up);
}else{
if(up == Color.yellow){
this.setBackground(Color.green);
up = Color.green;
}else{
this.setBackground(Color.yellow);
up = Color.yellow;
}
}
}
}
if(isSelected){
this.setBackground(Color.red);
}
//setBackground(background);
return this;
}
}