Java JTable上的JToolTip-未显示
我试图在JTable上实现JToolTip,但是遇到了一些问题。我在以下链接中找到了oracle的示例:Java JTable上的JToolTip-未显示,java,swing,jtable,jtooltip,Java,Swing,Jtable,Jtooltip,我试图在JTable上实现JToolTip,但是遇到了一些问题。我在以下链接中找到了oracle的示例: 公共类测试扩展了JPanel{ 私有布尔调试=false; 受保护的字符串[]列工具提示={null, 无效的 “个人最喜欢参加的运动”, “该人从事该项运动的年数”, “如果勾选,则该人不吃肉”}; 公开考试(){ 超级(新网格布局(1,0)); JTable table=新的JTable(新的MyTableModel()){ //实现表格单元工具提示。 公共字符串getToolTipT
公共类测试扩展了JPanel{
私有布尔调试=false;
受保护的字符串[]列工具提示={null,
无效的
“个人最喜欢参加的运动”,
“该人从事该项运动的年数”,
“如果勾选,则该人不吃肉”};
公开考试(){
超级(新网格布局(1,0));
JTable table=新的JTable(新的MyTableModel()){
//实现表格单元工具提示。
公共字符串getToolTipText(MouseEvent e){
字符串提示=null;
java.awt.Point p=e.getPoint();
int ROWDINDEX=行点(p);
int colIndex=柱状点(p);
int realColumnIndex=convertColumnIndexToModel(colIndex);
如果(realcolumnidex==2){//Sport column
tip=“此人最喜欢的运动”
+“参与is:”
+getValueAt(行索引,共索引);
}else如果(realcolumnidex==4){//Veggie列
TableModel模型=getModel();
String firstName=(String)model.getValueAt(rowIndex,0);
String lastName=(String)model.getValueAt(rowIndex,1);
布尔vegie=(布尔)model.getValueAt(rowIndex,4);
if(布尔值。真值。等于(素食)){
提示=firstName+“”+lastName
+“是素食者”;
}否则{
提示=firstName+“”+lastName
+“不是素食者”;
}
}否则{
//如果你不知道的话,你可以省略这一部分
//有没有提供自己工具的渲染器
//提示。
tip=super.gettooltipext(e);
}
返回端;
}
//实现表格标题工具提示。
受保护的JTableHeader createDefaultTableHeader(){
返回新的JTableHeader(columnModel){
公共字符串getToolTipText(MouseEvent e){
字符串提示=null;
java.awt.Point p=e.getPoint();
int index=columnModel.getColumnIndexAX(p.x);
int realIndex=columnModel.getColumn(index.getModelIndex();
返回列工具提示[realIndex];
}
};
}
};
表.setPreferredScrollableViewportSize(新维度(500,70));
表.setFillsViewPerthweight(真);
//创建滚动窗格并将表添加到其中。
JScrollPane scrollPane=新的JScrollPane(表);
//将滚动窗格添加到此面板。
添加(滚动窗格);
}
类MyTableModel扩展了AbstractTableModel{
私有字符串[]columnNames={“名字”,
“姓氏”,
“运动”,
“#年”,
“素食者”};
私有对象[][]数据={
{“凯西”,“史密斯”,
“滑雪板”,新整数(5),新布尔值(假)},
{“约翰”,“多伊”,
“划船”,新整数(3),新布尔值(真)},
{“苏”,“黑”,
“编织”,新整数(2),新布尔值(假)},
{“简”、“白”,
“快速读取”,新整数(20),新布尔值(真)},
{“乔”,“布朗”,
“Pool”、新整数(10)、新布尔值(false)}
};
public int getColumnCount(){
返回columnNames.length;
}
public int getRowCount(){
返回数据长度;
}
公共字符串getColumnName(int-col){
返回列名[col];
}
公共对象getValueAt(整数行,整数列){
返回数据[行][col];
}
/*
*JTable使用此方法确定默认渲染器/
*每个单元格的编辑器。如果我们没有实现此方法,
*最后一列将包含文本(“真”/“假”),
*而不是复选框。
*/
公共类getColumnClass(int c){
返回getValueAt(0,c).getClass();
}
/*
*不需要实现此方法,除非您的表
*可编辑。
*/
公共布尔值可编辑(int行,int列){
//请注意,数据/单元地址是恒定的,
//无论单元格出现在屏幕上的何处。
if(col<2){
返回false;
}否则{
返回true;
}
}
/*
*不需要实现此方法,除非您的表
*数据可以改变。
*/
public void setValueAt(对象值、整行、整列){
如果(调试){
System.out.println(“设置值在“+行+”,“+列
+“至”+价值
+“(一个例子)
+value.getClass()+”);
}
数据[行][列]=值;
FireTableCell更新(行、列);
如果(调试){
System.out.println(“数据的新值:”);
printDebugData();
}
}
私有void printDebugData(){
int numRows=getRowCount();
int numCols=getColumnCount();
用于(int i)=
public class test extends JPanel {
private boolean DEBUG = false;
protected String[] columnToolTips = {null,
null,
"The person's favorite sport to participate in",
"The number of years the person has played the sport",
"If checked, the person eats no meat"};
public test() {
super(new GridLayout(1,0));
JTable table = new JTable(new MyTableModel()) {
//Implement table cell tool tips.
public String getToolTipText(MouseEvent e) {
String tip = null;
java.awt.Point p = e.getPoint();
int rowIndex = rowAtPoint(p);
int colIndex = columnAtPoint(p);
int realColumnIndex = convertColumnIndexToModel(colIndex);
if (realColumnIndex == 2) { //Sport column
tip = "This person's favorite sport to "
+ "participate in is: "
+ getValueAt(rowIndex, colIndex);
} else if (realColumnIndex == 4) { //Veggie column
TableModel model = getModel();
String firstName = (String)model.getValueAt(rowIndex,0);
String lastName = (String)model.getValueAt(rowIndex,1);
Boolean veggie = (Boolean)model.getValueAt(rowIndex,4);
if (Boolean.TRUE.equals(veggie)) {
tip = firstName + " " + lastName
+ " is a vegetarian";
} else {
tip = firstName + " " + lastName
+ " is not a vegetarian";
}
} else {
//You can omit this part if you know you don't
//have any renderers that supply their own tool
//tips.
tip = super.getToolTipText(e);
}
return tip;
}
//Implement table header tool tips.
protected JTableHeader createDefaultTableHeader() {
return new JTableHeader(columnModel) {
public String getToolTipText(MouseEvent e) {
String tip = null;
java.awt.Point p = e.getPoint();
int index = columnModel.getColumnIndexAtX(p.x);
int realIndex = columnModel.getColumn(index).getModelIndex();
return columnToolTips[realIndex];
}
};
}
};
table.setPreferredScrollableViewportSize(new Dimension(500, 70));
table.setFillsViewportHeight(true);
//Create the scroll pane and add the table to it.
JScrollPane scrollPane = new JScrollPane(table);
//Add the scroll pane to this panel.
add(scrollPane);
}
class MyTableModel extends AbstractTableModel {
private String[] columnNames = {"First Name",
"Last Name",
"Sport",
"# of Years",
"Vegetarian"};
private Object[][] data = {
{"Kathy", "Smith",
"Snowboarding", new Integer(5), new Boolean(false)},
{"John", "Doe",
"Rowing", new Integer(3), new Boolean(true)},
{"Sue", "Black",
"Knitting", new Integer(2), new Boolean(false)},
{"Jane", "White",
"Speed reading", new Integer(20), new Boolean(true)},
{"Joe", "Brown",
"Pool", new Integer(10), new Boolean(false)}
};
public int getColumnCount() {
return columnNames.length;
}
public int getRowCount() {
return data.length;
}
public String getColumnName(int col) {
return columnNames[col];
}
public Object getValueAt(int row, int col) {
return data[row][col];
}
/*
* JTable uses this method to determine the default renderer/
* editor for each cell. If we didn't implement this method,
* then the last column would contain text ("true"/"false"),
* rather than a check box.
*/
public Class getColumnClass(int c) {
return getValueAt(0, c).getClass();
}
/*
* Don't need to implement this method unless your table's
* editable.
*/
public boolean isCellEditable(int row, int col) {
//Note that the data/cell address is constant,
//no matter where the cell appears onscreen.
if (col < 2) {
return false;
} else {
return true;
}
}
/*
* Don't need to implement this method unless your table's
* data can change.
*/
public void setValueAt(Object value, int row, int col) {
if (DEBUG) {
System.out.println("Setting value at " + row + "," + col
+ " to " + value
+ " (an instance of "
+ value.getClass() + ")");
}
data[row][col] = value;
fireTableCellUpdated(row, col);
if (DEBUG) {
System.out.println("New value of data:");
printDebugData();
}
}
private void printDebugData() {
int numRows = getRowCount();
int numCols = getColumnCount();
for (int i=0; i < numRows; i++) {
System.out.print(" row " + i + ":");
for (int j=0; j < numCols; j++) {
System.out.print(" " + data[i][j]);
}
System.out.println();
}
System.out.println("--------------------------");
}
}
/**
* Create the GUI and show it. For thread safety,
* this method should be invoked from the
* event-dispatching thread.
*/
private static void createAndShowGUI() {
//Create and set up the window.
JFrame frame = new JFrame("TableToolTipsDemo");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
//Create and set up the content pane.
JComponent newContentPane = new test();
newContentPane.setOpaque(true); //content panes must be opaque
frame.setContentPane(newContentPane);
//Display the window.
frame.pack();
frame.setVisible(true);
}
public static void main(String[] args) {
//Schedule a job for the event-dispatching thread:
//creating and showing this application's GUI.
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGUI();
}
});
}
}
columnToolTips = {null,
null,
"The person's favorite sport to participate in",
"The number of years the person has played the sport",
"If checked, the person eats no meat"};
if (realColumnIndex == 2) { //Sport column
tip = "This person's favorite sport to "
+ "participate in is: "
+ getValueAt(rowIndex, colIndex);
} else if (realColumnIndex == 4) { //Veggie column
TableModel model = getModel();
String firstName = (String)model.getValueAt(rowIndex,0);
String lastName = (String)model.getValueAt(rowIndex,1);
Boolean veggie = (Boolean)model.getValueAt(rowIndex,4);
if (Boolean.TRUE.equals(veggie)) {
tip = firstName + " " + lastName
+ " is a vegetarian";
} else {
tip = firstName + " " + lastName
+ " is not a vegetarian";
}
} else {
//You can omit this part if you know you don't
//have any renderers that supply their own tool
//tips.
tip = super.getToolTipText(e);
}
return new JTableHeader(columnModel) {
public String getToolTipText(MouseEvent e) {
String tip = null;
java.awt.Point p = e.getPoint();
//System.out.println(p);
int index = columnModel.getColumnIndexAtX(p.x);
int realIndex = columnModel.getColumn(index).getModelIndex();
return columnToolTips[realIndex];
}
};