Java JComboBox和JTable作为ListCellRenderer组件
我目前正在开发一个JComboBox组件,我希望在一个组合框中有一个JTable用于下拉选择。我已经扩展了ListCellRenderer,并且在弹出窗口中有了表 我想用两种不同的方式来表达它。当弹出窗口不可见时,作为选定行绑定列标签的第一个窗口。第二种方法是在弹出窗口可见时使用JScrollPane显示表 不幸的是,当我这样做时,弹出窗口被缩小到列表的行高,这只为表中的列留出了空间 如果我只是使用滚动窗格,我可以看到完整的表格,但当弹出窗口不可见时,我会看到组合框中的表格,这不是我想要的 如何设置高度,以便在弹出窗口不可见时仍能显示标签的情况下,表格可以容纳 下面是一个编译和运行的简单示例:Java JComboBox和JTable作为ListCellRenderer组件,java,swing,jtable,jcombobox,tablecelleditor,Java,Swing,Jtable,Jcombobox,Tablecelleditor,我目前正在开发一个JComboBox组件,我希望在一个组合框中有一个JTable用于下拉选择。我已经扩展了ListCellRenderer,并且在弹出窗口中有了表 我想用两种不同的方式来表达它。当弹出窗口不可见时,作为选定行绑定列标签的第一个窗口。第二种方法是在弹出窗口可见时使用JScrollPane显示表 不幸的是,当我这样做时,弹出窗口被缩小到列表的行高,这只为表中的列留出了空间 如果我只是使用滚动窗格,我可以看到完整的表格,但当弹出窗口不可见时,我会看到组合框中的表格,这不是我想要的 如何
import java.awt.Color;
import java.awt.Component;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JList;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.ListCellRenderer;
import javax.swing.event.ListDataEvent;
import javax.swing.event.ListSelectionEvent;
import javax.swing.event.ListSelectionListener;
import javax.swing.table.DefaultTableModel;
public class TableComboBoxMain {
public static void main(String[] args) {
JTableComboBox<Employee> combo = new JTableComboBox<>();
combo.addItem(new Employee("April",3));
//combo.setMaximumRowCount(10);
combo.setRenderer(new TableListCellRenderer(combo));
JFrame frame = new JFrame("Test Table Combo Box");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(combo);
frame.pack();
frame.setVisible(true);
}
public static class Employee{
String name;
int nr;
public Employee(String name, int number ){
this.name =name;
this.nr = number;
}
}
public static class JTableComboBox<E> extends JComboBox<E> implements ListSelectionListener{
@Override
public void valueChanged(ListSelectionEvent e) {System.out.println("Row selected"+e.getFirstIndex());
this.setSelectedIndex(e.getFirstIndex());
}
}
public static class TableListCellRenderer extends JScrollPane implements ListCellRenderer{
JTable table;
JTableComboBox combo;
boolean mouseListenerAdded;
public TableListCellRenderer(JTableComboBox combo){
this.combo=combo;
DefaultTableModel model = new DefaultTableModel();
String[] cols1 = new String[]{"1","2","3","4"};
String[] cols2 = new String[]{"Mark","John","April","Mary"};
model.addColumn("Nr", cols1);model.addColumn("Name",cols2);
table = new JTable(model);table.setShowGrid(true);table.setGridColor(Color.gray);
this.getViewport().add(table);
}
@Override
public Component getListCellRendererComponent(JList list, Object value, int index, boolean isSelected, boolean cellHasFocus) {
if(!mouseListenerAdded){
list.addMouseListener(this.getListener());
mouseListenerAdded = true;
}//If this is uncommented then the BasicComboPopup size is always no more than 1 row?!!
if(!combo.isPopupVisible()){
Employee emp = (Employee) value;
return new JLabel(emp.name);
}else
return this;
}
public MouseAdapter getListener(){
MouseAdapter adapter = new MouseAdapter(){
@Override
public void mousePressed(MouseEvent e) {
if(combo.isPopupVisible()){
System.out.println("MouseClicked over list");
int row = table.rowAtPoint(e.getPoint());
if(row>0){
table.setRowSelectionInterval(row-1, row-1);
ListDataEvent event = new ListDataEvent(combo,ListDataEvent.CONTENTS_CHANGED,row-1,row-1);
combo.contentsChanged(event);
}
}
}
};
return adapter;
}
}
}
导入java.awt.Color;
导入java.awt.Component;
导入java.awt.event.MouseAdapter;
导入java.awt.event.MouseEvent;
导入javax.swing.JComboBox;
导入javax.swing.JFrame;
导入javax.swing.JLabel;
导入javax.swing.JList;
导入javax.swing.JScrollPane;
导入javax.swing.JTable;
导入javax.swing.ListCellRenderer;
导入javax.swing.event.ListDataEvent;
导入javax.swing.event.ListSelectionEvent;
导入javax.swing.event.ListSelectionListener;
导入javax.swing.table.DefaultTableModel;
公共类TableComboxMain{
公共静态void main(字符串[]args){
JTableComboBox combo=新的JTableComboBox();
合并附件(新员工(“4月3日”);
//combo.setMaximumRowCount(10);
setRenderer(新的TableListCellRenderer(combo));
JFrame frame=新JFrame(“测试表组合框”);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(组合);
frame.pack();
frame.setVisible(true);
}
公共静态类雇员{
字符串名;
国际天然气公司;
公共雇员(字符串名称、整数编号){
this.name=名称;
这.nr=数量;
}
}
公共静态类JTableComboBox扩展了JComboBox,实现了ListSelectionListener{
@凌驾
public void valueChanged(ListSelectionEvent e){System.out.println(“选定行”+e.getFirstIndex());
这个.setSelectedIndex(e.getFirstIndex());
}
}
公共静态类TableListCellRenderer扩展JScrollPane实现ListCellRenderer{
JTable表;
JTableComboBox组合;
添加布尔鼠标;
公共TableListCellRenderer(JTableComboBox组合){
this.combo=combo;
DefaultTableModel=新的DefaultTableModel();
字符串[]cols1=新字符串[]{“1”、“2”、“3”、“4”};
字符串[]cols2=新字符串[]{“马克”、“约翰”、“四月”、“玛丽”};
model.addColumn(“Nr”,cols1);model.addColumn(“Name”,cols2);
table=新JTable(模型);table.setShowGrid(真);table.setGridColor(Color.gray);
this.getViewport().add(表);
}
@凌驾
公共组件getListCellRenderComponent(JList列表、对象值、int索引、布尔isSelected、布尔cellHasFocus){
如果(!已添加鼠标){
list.addMouseListener(this.getListener());
mouseListenerAdded=真;
}//如果未注释,则BasicComboPopup大小始终不超过1行?!!
如果(!combo.isPopupVisible()){
员工emp=(员工)价值;
返回新的JLabel(emp.name);
}否则
归还这个;
}
公共MouseAdapter getListener(){
MouseAdapter适配器=新的MouseAdapter(){
@凌驾
公共无效鼠标按下(MouseEvent e){
if(combo.isPopupVisible()){
System.out.println(“鼠标点击列表”);
int row=table.rowAtPoint(如getPoint());
如果(行>0){
表.setRowSelectionInterval(第1行,第1行);
ListDataEvent事件=新建ListDataEvent(组合,ListDataEvent.CONTENTS\u已更改,第1行,第1行);
组合。内容更改(事件);
}
}
}
};
返回适配器;
}
}
}
所以我找到了解决问题的方法。我还没有完成,因为我还想进行一些互动:
import java.awt.BorderLayout;
import java.awt.Component;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import javax.swing.DefaultListCellRenderer;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JList;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.ScrollPaneConstants;
import javax.swing.event.ListDataEvent;
import javax.swing.event.ListSelectionEvent;
import javax.swing.event.ListSelectionListener;
import javax.swing.plaf.basic.BasicComboBoxUI;
import javax.swing.plaf.basic.BasicComboPopup;
import javax.swing.plaf.basic.ComboPopup;
import javax.swing.table.DefaultTableModel;
public class TableComboBoxMain {
public static void main(String[] args) {
JTableComboBox<String> combo = new JTableComboBox<>();
combo.addItem("");
BasicComboBoxUI ui = new BasicComboBoxUI(){
@Override
protected ComboPopup createPopup() {
return new BasicComboPopup( comboBox ){
@Override
protected int getPopupHeightForRowCount(int maxRowCount) {
return 100;
}
@Override
protected JScrollPane createScroller() {
JScrollPane sp = new JScrollPane( list,
ScrollPaneConstants.VERTICAL_SCROLLBAR_AS_NEEDED,
ScrollPaneConstants.HORIZONTAL_SCROLLBAR_AS_NEEDED );
sp.getHorizontalScrollBar().setFocusable( false );
return sp;
}
};
}
};
combo.setUI(ui);
combo.setRenderer(new TableListCellRenderer(combo));
JFrame frame = new JFrame("Test Table Combo Box");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(combo);
frame.pack();
frame.setVisible(true);
}
public static class Employee{
String name;
int nr;
public Employee(String name, int number ){
this.name =name;
this.nr = number;
}
}
public static class JTableComboBox<E> extends JComboBox<E> implements ListSelectionListener{
@Override
public void valueChanged(ListSelectionEvent e) {
System.out.println("Row selected"+e.getFirstIndex());
this.setSelectedIndex(e.getFirstIndex());
}
}
public static class TableListCellRenderer extends DefaultListCellRenderer{
JTable table;
JTableComboBox combo;
JPanel renderer = new JPanel();
JPanel colHeader = new JPanel();
JScrollPane scroll = new JScrollPane();
boolean mouseListenerAdded;
public TableListCellRenderer(JTableComboBox combo){
this.combo=combo;
DefaultTableModel model = new DefaultTableModel();
String[] cols1 = new String[]{"1","2","3","4","5","6"};
String[] cols2 = new String[]{"Mark","John","April","Mary","Joe","Jack"};
model.addColumn("Nr", cols1);model.addColumn("Name",cols2);
table = new JTable(model);
table.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);
colHeader.add(table.getTableHeader());
renderer.setLayout(new BorderLayout());
renderer.add(colHeader, BorderLayout.NORTH);
renderer.add(table,BorderLayout.CENTER);
scroll.setHorizontalScrollBarPolicy(ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER);
scroll.setVerticalScrollBarPolicy(ScrollPaneConstants.VERTICAL_SCROLLBAR_NEVER);
scroll.getViewport().add(table);
}
@Override
public Component getListCellRendererComponent(JList list, Object value, int index, boolean isSelected, boolean cellHasFocus) {
list.setFixedCellHeight(table.getRowHeight()*(table.getRowCount()+1)+10);
list.setFixedCellWidth(table.getPreferredSize().width);
JLabel label = (JLabel) super.getListCellRendererComponent(list, value, index, isSelected, cellHasFocus);
if(!mouseListenerAdded){
list.addMouseListener(this.getListener());
mouseListenerAdded = true;
}
if(!combo.isPopupVisible()){
label.setText("Select...");
if(table.getSelectedRowCount()>0)
label.setText(""+table.getModel().getValueAt(table.getSelectedRow(),1));
return label;
}
return scroll;
}
public MouseAdapter getListener(){
MouseAdapter adapter = new MouseAdapter(){
@Override
public void mousePressed(MouseEvent e) {
if(combo.isPopupVisible()){
System.out.println("MouseClicked over list");
int row = table.rowAtPoint(e.getPoint());
if(row>0){
table.setRowSelectionInterval(row-1, row-1);
ListDataEvent event = new ListDataEvent(combo,ListDataEvent.CONTENTS_CHANGED,row-1,row-1);
combo.contentsChanged(event);
}
}
}
};
return adapter;
}
}
}
导入java.awt.BorderLayout;
导入java.awt.Component;
导入java.awt.event.MouseAdapter;
导入java.awt.event.MouseEvent;
导入javax.swing.DefaultListCellRenderer;
导入javax.swing.JComboBox;
导入javax.swing.JFrame;
导入javax.swing.JLabel;
导入javax.swing.JList;
导入javax.swing.JPanel;
导入javax.swing.JScrollPane;
导入javax.swing.JTable;
导入javax.swing.ScrollPaneConstants;
导入javax.swing.event.ListDataEvent;
导入javax.swing.event.ListSelectionEvent;
导入javax.swing.event.ListSelectionListener;
导入javax.swing.plaf.basic.BasicComboxUI;
导入javax.swing.plaf.basic.basicmbopopup;
导入javax.swing.plaf.basic.ComboPopup;
导入javax.swing.table.DefaultTableModel;
公共类TableComboxMain{
公共静态void main(字符串[]args){
JTableComboBox combo=新的JTableComboBox();
组合添加项(“”);
BasicComboxUI=新的BasicComboxUI(){
@凌驾
受保护的ComboPopup createPopup(){
返回新的BasicComboPopup(组合框){
@凌驾
受保护的int GetPopucRightForRowCount(int maxRowCount){