How Vaadin translates &Address to Alt+A using shortcut by a shorthand notation in AbstractField.FocusShortcut?

Tag: java,keyboard-shortcuts,vaadin,textfield,shorthand

reading this page of the Book of Vaadin:

https://vaadin.com/book/vaadin7/-/page/advanced.shortcuts.html

You can also specify the shortcut by a shorthand notation, where the shortcut key is indicated with an ampersand (&).

// A field with Alt+A bound to it, using shorthand notation
TextField address = new TextField("Address (Alt+A)");
address.addShortcutListener(
        new AbstractField.FocusShortcut(address, "&Address"));

This is especially useful for internationalization, so that you can determine the shortcut key from the localized string.

If I add this address textfield object to my layout and then I press Alt+A the field is focused.

But how does Vaadin knows that "&Address" is ALT+A??? Does it parses the string internally or compares it with something?

What is this "&Address" shorthand notation for keyboard shortcuts? Are there also other shorthand notations?

Best How To :

From the ShortcutAction javadocs:

Insert one or more modifier characters before the character to use as keycode. E.g "&Save" will make a shortcut responding to ALT-S, "E^xit" will respond to CTRL-X. Multiple modifiers can be used, e.g "&^Delete" will respond to CTRL-ALT-D (the order of the modifier characters is not important).

The modifier characters will be removed from the caption. The modifier character is be escaped by itself: two consecutive characters are turned into the original character w/o the special meaning. E.g "Save&&&close" will respond to ALT-C, and the caption will say "Save&close".

There are three modifier characters: ^ (ctrl), & (alt), and _ (shift). Internally, Vaadin uses regular expressions to parse the shorthand caption, match the modifier characters and build the keyboard shortcuts. You can look at the code here.

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