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POMulti-cell selection in a Swing JTable
 

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  1. POMulti-cell selection in a Swing JTable
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    <p>I want to provide multi-cell editing functionality to a JTable: double click will still edit the value in the selected cell (the standard behavior), while right-click should open up a popup menu with an entry "Edit selected cells".</p> <p>When the user hits this menu entry, the last cell in the selected range becomes editable. The other selected cells remain selected. Then they write the new value and, when the edition is finished (usually by hitting Enter), all of the selected cells get this value.</p> <p>Let's assume, for simplicity, that all cells contain the same value types, say, integers.</p> <p>Here's the code that shows up the popup dialog, to get started:</p> <pre><code>table.setSelectionMode(ListSelectionModel.SINGLE_INTERVAL_SELECTION); table.setCellSelectionEnabled(true); table.addMouseListener(new MouseAdapter() { @Override public void mousePressed(MouseEvent e) { if (e.isPopupTrigger()) { doPop(e); } } @Override public void mouseReleased(MouseEvent e) { if (e.isPopupTrigger()) { doPop(e); } } private void doPop(MouseEvent e) { MultiEditPopUp menu = new MultiEditPopUp(tblRanges); menu.show(e.getComponent(), e.getX(), e.getY()); } }); class MultiEditPopUp extends JPopupMenu { JMenuItem menuItem; MultiEditPopUp(JTable table) { menuItem = new JMenuItem("Edit selected"); menuItem.setAction(new BulkEditAction(table)); add(menuItem); } } class BulkEditAction extends AbstractAction { private final JTable table; public BulkEditAction(JTable table) { this.table = table; } @Override public void actionPerformed(ActionEvent actionEvent) { // TODO: let the user edit the last cell, and then apply to the others } } </code></pre> <p>How can I do such a thing?</p>
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    1. COwhat exactly is the problem? When receiving the edited value, propagate it to all selected cells and be happy :-)
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    2. COa couple of comments (unrelated to the problem which I didn't get ;-) a) do not subclass any JSomething, instead use them (JPopupMenu is designed to add actions/items, there is no need to subclass just to add a particular item) b) always use the highest abstraction, available here that means setComponentPopupMenu instead of a mouseListener (which provides incomplete functionality, anyway, as it doesn't cover popups by keyboard)
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    3. COThe problem is how to now let the user edit that cell, while keeping the selection. Thanks for the suggestion about the subclassing.
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