【发布时间】：2012-02-12 12:43:37
【问题描述】：
我正在制作一个 java 项目，我正在使用 JTable。
我想做的事情是将popupmenu 链接到jtable。 popupmenu 有四个不同的items。一些items 需要知道在jtable 中选择了row。问题出在selectRow -function 中。我无法获得返回正确row 的函数。我单击带有right mouse button 的jtable，然后在我单击的同一列中弹出popupmenu。但是当我使用addSelectedRow 或removeSelectedRow -functions（在带有标签“addSelected”或“deleteSelected”的menuItem 中）并且没有选择任何row(s) 时，我使用selectRow -function 来查找row我点击right mousebutton。似乎rowAtPoint(Point p) 不能只找到正确的行。它返回 0 或 -1。我已经为这个问题苦苦挣扎了将近一个星期，所以请拉皮条我的代码：D 我希望代码足够干净：D
http://painkiller.comlu.com/images/1.jpg
这是一个问题的屏幕截图。
JTable 总是至少有一排。我单击任意行（在这种情况下是第二个row）。 Row 未按目的选择。现在，如果我按“Lisää valittu” - 这意味着“Add selected”，函数selectRow() 将被调用。
/**位置
jTbl.getLocation(): java.awt.Point[x=0,y=0]
e.getPoints() java.awt.Point[x=4,y=8]
SwingUtilities.convertPoint(e.getComponent(), e.getPoint(), jTbl) java.awt.Point[x=350,y=31]
首先我尝试了e.getPoint()
* e.getPoints() -> java.awt.Point[x=4,y=8]
从rowAtPoint() 返回的行索引号：0
然后我尝试了SwingUtilities.convertPoint()
* SwingUtilities.convertPoint(tablePopMenu, e.getPoint(), jTbl); -> java.awt.Point[x=28,y=10]
从rowAtPoint() 返回的行索引号：2
所以它似乎可以工作，但有时函数会抛出 -1 或 0。（需要检查出那个错误）但大多数情况下效果很好。
private void TableMousePressed(java.awt.event.MouseEvent evt) {
try
{
/*
* The popupmenu content (items) are standart for all tables
* The label of popupmenu items are used to select proper
* command in select case
* 1. Add selected-> Add only selected row(s)
* 2. Add all -> Add all rows
* 3. Delete selected -> Remove only selected row(s)
* 4. Delete all-> Remove all row(s)
*/
javax.swing.JTable temp; //Temporar jTable alien
String label = ((javax.swing.JMenuItem)evt.getSource()).getText(); //Switch Case
temp = (javax.swing.JTable)((JPopupMenu)(evt.getComponent().getParent())).getInvoker();
switch(label) //Select rigt method by jMenuItem.getText() method (the label of menu item) {
case "Add selected":
addSelectedRow(evt, temp);
break;
case "Add all":
addAllRows(temp);
break;
case "Delete selected":
removeSelectedRow(evt, temp);
break;
case "Delete all":
removeAllRows(temp);
break;
}
}
catch(Exception ex){ex.printStackTrace();}
}
/**
* @param e - MouseEvent
* @param jTbl - JTable which will be used
*/
private void addSelectedRow(java.awt.event.MouseEvent e, javax.swing.JTable jTbl){
if(jTbl.getSelectedRow() == -1){ //If no row(s) is selected
selectRow(e, jTbl); //select row
}
int cellCount = jTbl.getModel().getColumnCount(); //amount of columns to apply
int rows[] = jTbl.getSelectedRows(); //amount of rows to apply
cellCollection = new Object[jTbl.getModel().getColumnCount()]; //Object which contains row and cells. will be added to a jTable as a new row
for(int row = 0; row < rows.length; row++){ //Creates new row by excisting data
for(int cell = 0; cell < cellCount; cell++){
cellCollection[cell] = jTbl.getModel().getValueAt(rows[row], cell);
}
((DefaultTableModel)jTbl.getModel()).addRow(cellCollection); //Adds a new row with data
}
}
/**
* @param jTbl - JTable which will be used
*/
private void addAllRows(javax.swing.JTable jTbl){
int rowCount = jTbl.getModel().getRowCount(); //Amount of adding rows
int cellCount = jTbl.getModel().getColumnCount(); //Amount of adding colums
cellCollection = new Object[jTbl.getModel().getColumnCount()]; //New object which contains a row with columns filled with excisting data in a for-loop
for(int row = 0; row < rowCount; row++){
for(int cell = 0; cell < cellCount; cell++){
cellCollection[cell] = jTbl.getModel().getValueAt(row, cell);
}
((DefaultTableModel)jTbl.getModel()).addRow(cellCollection);
}
}
/**
* @param e - MouseEvent
* @param jTbl - JTable which will be used
*/
private void removeSelectedRow(java.awt.event.MouseEvent e, javax.swing.JTable jTbl){
if(jTbl.getSelectedRow() == -1){ //If no row(s) is selected
selectRow(e, jTbl); //selects a row
}
int[] rows = jTbl.getSelectedRows(); //Get selected row(s)
for(int i = rows.length - 1; i >= 0; i--)
((DefaultTableModel)jTbl.getModel()).removeRow(rows[i]); //Removes the rows
getTableToLife(jTbl); //Adds a new empty row if jtable has no rows after removing
}
/**
* @param jTbl - JTable which will be used
*/
private void removeAllRows(javax.swing.JTable jTbl){
int rowCount = jTbl.getModel().getRowCount(); //Amount of removing rows
for(int row = rowCount-1; row >=0; row--){
((DefaultTableModel)jTbl.getModel()).removeRow(row); //Remove rows
}
getTableToLife(jTbl);//Adds a new empty row if jtable has no rows after removing
}
/**
* @param jTbl - JTable which will be saved
*/
private void getTableToLife(javax.swing.JTable jTbl){
if(jTbl.getModel().getRowCount() == 0){ //If jtable has no rows
int cellCount = jTbl.getModel().getColumnCount(); //How many cells will be added
cellCollection = new Object[cellCount];
for(int cell = 0; cell < cellCount; cell++){
cellCollection[cell] = null; //No new data is required }
((DefaultTableModel)jTbl.getModel()).addRow(cellCollection); //Adding a new empty row
}
}
/**
* @param e - Mouse event
*/
private void selectRow(java.awt.event.MouseEvent e, javax.swing.JTable jTbl)
{
// This is the main problem at the moment
// System.out.print("\r " + jTbl.rowAtPoint(e.getPoint()));
// ListSelectionModel selector = jTbl.getSelectionModel();
// selector.removeSelectionInterval(0, jTbl.getHeight()); //I though it he could help, but no effect (row [0] seems to be selected
// int p = jTbl.rowAtPoint(e.getPoint()); //or this function seems to be uncapable to find right row i clicked on jtable
// selector.setSelectionInterval(p, p); //returns 0 or -1. reason is unknown
// New solution
ListSelectionModel selector = jTbl.getSelectionModel();
Point newP = SwingUtilities.convertPoint(tablePopMenu, e.getPoint(), jTbl);
int p = jTbl.rowAtPoint(newP);
System.out.print("\rRow number: " + (p));
if(p <=0)
selector.setSelectionInterval(p, p);
else
selector.setSelectionInterval(p-1, p-1);
}
感谢你们拯救了我的一天！
【问题讨论】：
标签： java swing jtable jpopupmenu