Java Swing JTable; Right Click Menu (How do I get it to "select" aka highlight the row)
Short: I need a "right-click event" to highlight the cell row.
I am using a JTable inside a ScrollPane in Java Swing (Netbeans Matisse). I have a MouseClicked event listener on the JTable that does the following:
if (evt.getButton() == java.awt.event.MouseEvent.BUTTON3) {
System.out.println开发者_JS百科("Right Click");
JPopUpMenu.show(myJTable, evt.getX(), evt.getY())
}
The problem is... whenever I execute a right click on the JTable, the row isn't highlighted (I set the selection to rows only btw). I have looked for several setSelected() functions but could not find a suitable one. By default, left clicking automatically highlights the row. How do I set it up for right clicks?
like this:
table.addMouseListener(new MouseAdapter() {
@Override
public void mouseReleased(MouseEvent e) {
int r = table.rowAtPoint(e.getPoint());
if (r >= 0 && r < table.getRowCount()) {
table.setRowSelectionInterval(r, r);
} else {
table.clearSelection();
}
int rowindex = table.getSelectedRow();
if (rowindex < 0)
return;
if (e.isPopupTrigger() && e.getComponent() instanceof JTable ) {
JPopupMenu popup = createYourPopUp();
popup.show(e.getComponent(), e.getX(), e.getY());
}
}
});
......
The accepted answer does not take modifier keys like ctrl or shift into account, yet they indicate that the current selection should not be replaced, but extended.
Also, I added multi-OS support by checking mousePressed
and mouseReleased
.
Following, you can find a complete example on how to adjust the selected rows, using the ListSelectionModel
, including MouseEvent#getModifiers
checks. After that, it is possible to open a (optional) JPopupMenu
.
JPopupMenu contextMenu = new JPopupMenu();
// ...
// add elements to the popup menu
// ...
table.addMouseListener(new MouseAdapter() {
@Override
public void mousePressed(MouseEvent e) {
handleRowClick(e);
if (e.isPopupTrigger()) {
doPop(e);
} else {
hidePop();
}
}
@Override
public void mouseReleased(MouseEvent e) {
if (e.isPopupTrigger()) {
doPop(e);
}
}
private void handleRowClick(MouseEvent e) {
ListSelectionModel selectionModel = table.getSelectionModel();
Point contextMenuOpenedAt = e.getPoint();
int clickedRow = table.rowAtPoint(contextMenuOpenedAt);
if (clickedRow < 0) {
// No row selected
selectionModel.clearSelection();
} else {
// Some row selected
if ((e.getModifiers() & InputEvent.SHIFT_MASK) == InputEvent.SHIFT_MASK) {
int maxSelect = selectionModel.getMaxSelectionIndex();
if ((e.getModifiers() & InputEvent.CTRL_MASK) == InputEvent.CTRL_MASK) {
// Shift + CTRL
selectionModel.addSelectionInterval(maxSelect, clickedRow);
} else {
// Shift
selectionModel.setSelectionInterval(maxSelect, clickedRow);
}
} else if ((e.getModifiers() & InputEvent.CTRL_MASK) == InputEvent.CTRL_MASK) {
// CTRL
selectionModel.addSelectionInterval(clickedRow, clickedRow);
} else {
// No modifier key pressed
selectionModel.setSelectionInterval(clickedRow, clickedRow);
}
}
}
private void doPop(MouseEvent e) {
if (table.getSelectedRowCount() == 0) {
return;
}
contextMenu.setVisible(true);
contextMenu.show(e.getComponent(), e.getX(), e.getY());
}
private void hidePop() {
contextMenu.setVisible(false);
}
});
You can create another MouseEvent (example here is in a JTable subclass; processMouseEvent()
has protected access, otherwise could use dispatchEvent()
method). Takes care of using the modifiers for the selection update.
addMouseListener(new MouseAdapter() {
@Override public void mousePressed(MouseEvent e) { checkForPopupMenu(e); }
@Override public void mouseReleased(MouseEvent e) { checkForPopupMenu(e); }
private void checkForPopupMenu(MouseEvent e) {
if (e.isPopupTrigger()) {
processMouseEvent(new MouseEvent(e.getComponent(), e.getID(), e.getWhen(), e.getModifiersEx(), e.getX(), e.getY(), 1, false, MouseEvent.BUTTON1));
if (getSelectedRowCount() != 0)
popup.show(e.getComponent(), e.getX(), e.getY());
}
}
});
精彩评论