Java:从popupmenu actionListener事件获取行数据 [英] java: Get row data from popupmenu actionListener event

问题描述

我这里有一个小场景，也许是重复的.我有JTable，我在其中显示一些数据，我有一个鼠标侦听器，该侦听器监听表上的右键单击并显示带有一个menuitem的弹出菜单.我的目标是，当用户单击菜单项时，我从表中获取值并将其输入到具有一些填充字段的自定义对话框中，因此用户不必手动输入整个对话框，因为我将向对话框提供表格中所选的值.但是我的问题是menuitem actionevent没有办法指出要点，所以我可以使用table.getRowAt().我已经阅读了另一条评论(请在此处 https://stackoverflow.com/a/4122082/1788917 )告诉我可以将行号保存在一个变量中，然后菜单操作项可以通过该变量进行访问.

I'm having a little scenario here that maybe a duplicate. I have JTable where i show some data, i have a mouselistener that listens for right clicks on the table and displays a popup menu with one menuitem. My goal is that when the user clicks the menuitem, i get the values from the table and feed them into a custom dialog which has some fill in fields, so that the user doesn't have to feed the whole dialog by hand since i will feed the dialog with the values selected on the table. but my problem is that the menuitem actionevent doesn't have a way of getting the point so that i can use table.getRowAt(). i have read another comment (check here https://stackoverflow.com/a/4122082/1788917) where i have been told that i can save the row number in a variable that can then be accessed by the actionlistener for the menuitem.

我希望它看起来像这样

theScrollPane.getViewport().add(myJTable, null);
JMenuItem menuItem = new JMenuItem(clickMe);

menuItem.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
    menuItemActionPerformed(e);
}
});

MouseListener popupListener = new PopupListener(); 
popupMenu.add(menuItem);
myJTable.addMouseListener(popupListener);

protected void menuItemActionPerformed (ActionEvent e) {
    // what to do here to get the table row data
    // and send it to my custom dialog via it's constructor ???
}


// a simple nested class for the popup
class PopupListener extends MouseAdapter {
    public void mousePressed(MouseEvent e) {
        int row = myJTable.rowAtPoint(e.getPoint());
        int selectedRow = myJTable.getSelectedRow();

        // just to make sure the popup appears only where the row is 
                    // selected
        if (row == selectedRow) {
            showPopup(e);
        }
    }

    public void mouseReleased(MouseEvent e) {
        int row = myJTable.rowAtPoint(e.getPoint());
        int selectedRow = myJTable.getSelectedRow();
        if (row == selectedRow) {
            showPopup(e);
        }
    }

    private void showPopup(MouseEvent e) {
        if (e.isPopupTrigger()) {
        popupMenu.show(e.getComponent(), e.getX(), e.getY());
        }
    }

}

所以我的问题是，保存行号是我可以做到这一点的唯一方法，还是有更好的方法?

so my question is, is saving the row number the only way that i can do this or is there a better way?

推荐答案

我还阅读了另一条评论(请在此处 https://stackoverflow.com/a/4122082/1788917 )，其中有人告诉我可以将行号保存在变量

i have read another comment (check here https://stackoverflow.com/a/4122082/1788917) where i have been told that i can save the row number in a variable

您读错了评论.

如果您阅读该链接上方的答案(即具有7票的答案)，您将看到解决方案是选择在显示弹出菜单之前单击的行.然后在菜单项操作"中可以引用

If you read the answer above that link (ie. the one with 7 votes) you will see the solution is to select the row you clicked on BEFORE showing the popup menu. Then in your menu item Action you can reference

table.getSelectedRow();

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