如何在 JavaFX 中向菜单（不是 MenuItem）添加快捷方式

Question

I want to do menu like this (with shortcuts):

So, I did:

Menu fileMenu = new Menu("File");
fileMenu.setAccelerator(new KeyCodeCombination(KeyCode.F, KeyCombination.ALT_DOWN));

But it doesn't work. When I press ALT+F nothing happens. Besides, I don't know how to make key letters underlined. Can anyone say how to do it?

Answer 1

What you're looking for is a "mnemonic" , not an accelerator. Simply put an underscore ( _ ) in front of the letter you want to use and ensure the mnemonicParsing property is set to true , which it is by default.

For example, the following:

Menu fileMenu = new Menu("_File");

Will let you use ALT + F to display the menu.

Note this works with MenuItem as well ( Menu extends MenuItem ). Adding a mnemonic to a MenuItem provides another way for your user to fire the item's action (in addition to clicking it, using an accelerator, etc.).

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Warning: Mnemonics are not supported on all platforms (eg, Macs). Consequently, you may want to define the accelerator as well.