![]() |
The Java Developers Almanac 1.4Order this book from Amazon. |
e617. Determining the Opposite Component of a Focus EventThe opposite component is the other component affected in a focus event. Specifically, in a focus-lost event, the opposite component is the one gaining the focus. In a focus-gain event, the opposite component is the one losing the focus.Sometimes the opposite component is null, which indicates that the component is in some other application. component.addFocusListener(new MyFocusListener()); public class MyFocusListener extends FocusAdapter { public void focusGained(FocusEvent evt) { // The component that lost the focus Component c = evt.getOppositeComponent(); } public void focusLost(FocusEvent evt) { // The component that gained the focus Component c = evt.getOppositeComponent(); } }
e607. Preventing a Component from Gaining the Focus e608. Preventing a Window from Gaining the Focus e609. Listening to All Focus Changes Between Components in an Application e610. Setting Focus Traversal Keys in a Component e611. Setting Focus Traversal Keys for the Entire Application e612. Moving the Focus to the Next or Previous Focusable Component e613. Modifying the Focus Traversal Order e614. Setting the Initial Focused Component in a Window e615. Finding the Next Focusable Component e616. Determining If a Focus Lost Is Temporary or Permanent e618. Validating a JTextField When Permanently Losing the Focus e619. Removing the Focus from the Application e620. Activating a Keystroke When Any Component in the Window Has Focus e621. Activating a Keystroke When Any Child Component Has Focus
© 2002 Addison-Wesley. |