Menus: improved usability of submenus #490
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…times, which can freeze the application caused pushing multiple event queues and popping wrong event queue first (e.g. NetBeans Form Editor invokes `FlatLaf.initialize()` but not `uninitialize()`) (PR #490; apache/netbeans#4231)
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This PR improves the usability of submenus (see issue #247).
It makes it much easier to move the mouse into a submenu without the risk that the submenu is hidden.
Without this PR, you have to move the mouse on the red path, otherwise the submenu will be hidden.
With this PR, you can move the mouse on the green path, over other menu items.
The implementation uses a safe triangle, described in this article.
When you move the mouse within the safe triangle toward the submenu, it stays open.
Demo:
To see the safe triangle in your application (for testing) use:
To disable this feature use:
Note: This feature temporary installs a custom AWT event queue (
java.awt.EventQueue) while the safe triangle active (as shown in above video). If you also use a custom event queue in your application (a subclass ofjava.awt.EventQueue), test whether this PR raise any issues.