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POHow to bind command-? as a swing action accelerator for a help menu?
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  1. POHow to bind command-? as a swing action accelerator for a help menu?
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    copied!<p>The standard key combination for help is <kbd>command</kbd>-<kbd>?</kbd> on macs. How can I bind this key combination to a menu item. </p> <p>Note: As our users have different keyboard layouts I´m looking for a solution that does not require knowledge about what key "?" is located on.</p> <p>Using <code>KeyStroke.getKeyStroke(String)</code>, which javadoc says; </p> <pre><code>Parses a string and returns a `KeyStroke`. The string must have the following syntax: &lt;modifiers&gt;* (&lt;typedID&gt; | &lt;pressedReleasedID&gt;) modifiers := shift | control | ctrl | meta | alt | button1 | button2 | button3 typedID := typed &lt;typedKey&gt; typedKey := string of length 1 giving Unicode character. pressedReleasedID := (pressed | released) key key := KeyEvent key code name, i.e. the name following "VK_". </code></pre> <p>I have this example code: </p> <pre><code>import javax.swing.*; import java.awt.Dimension; import java.awt.event.ActionEvent; public class HelpShortcut extends JFrame { public HelpShortcut(){ // A few keystrokes to experiment with //KeyStroke keyStroke = KeyStroke.getKeyStroke("pressed A"); // A simple reference - Works //KeyStroke keyStroke = KeyStroke.getKeyStroke("typed ?"); // Works KeyStroke keyStroke = KeyStroke.getKeyStroke("meta typed ?"); // What we want - Does not work // If we provide an invalid keystroke we get a null back - fail fast if (keyStroke==null) throw new RuntimeException("Invalid keystroke"); // Create a simple menuItem linked to our action with the keystroke as accelerator JMenuItem helpMenuItem = new JMenuItem(new HelpAction()); helpMenuItem.setAccelerator(keyStroke); // Install the menubar with a help menu JMenuBar mainMenu = new JMenuBar(); JMenu helpMenu = new JMenu("Help"); helpMenu.add(helpMenuItem); mainMenu.add(helpMenu); setJMenuBar(mainMenu); } // Scaffolding public static void main(String[] pArgs) { HelpShortcut helpShortcut= new HelpShortcut(); helpShortcut.setLocationRelativeTo(null); helpShortcut.setSize(new Dimension(100, 162)); helpShortcut.setVisible(true); } private class HelpAction extends AbstractAction { public HelpAction() { putValue(Action.NAME,"Help me!"); } @Override public void actionPerformed(final ActionEvent pActionEvent) { JOptionPane.showMessageDialog(HelpShortcut.this,"You should ask StackOverflow!"); } } } </code></pre>
 

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