![]() |
The Java Developers Almanac 1.4Order this book from Amazon. |
e615. Finding the Next Focusable Componentpublic Component findNextFocus() { // Find focus owner Component c = KeyboardFocusManager.getCurrentKeyboardFocusManager().getFocusOwner(); Container root = c == null ? null : c.getFocusCycleRootAncestor(); if (root != null) { FocusTraversalPolicy policy = root.getFocusTraversalPolicy(); Component nextFocus = policy.getComponentAfter(root, c); if (nextFocus == null) { nextFocus = policy.getDefaultComponent(root); } return nextFocus; } return null; } public Component findPrevFocus() { // Find focus owner Component c = KeyboardFocusManager.getCurrentKeyboardFocusManager().getFocusOwner(); Container root = c == null ? null : c.getFocusCycleRootAncestor(); if (root != null) { FocusTraversalPolicy policy = root.getFocusTraversalPolicy(); Component prevFocus = policy.getComponentBefore(root, c); if (prevFocus == null) { prevFocus = policy.getDefaultComponent(root); } return prevFocus; } return null; }
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 e616. Determining If a Focus Lost Is Temporary or Permanent e617. Determining the Opposite Component of a Focus Event 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. |