Java(TM) 2 Platform, Standard Edition, v1.2.2 API Specification: Class DefaultFocusManager - JDK 5 Documentation v1.2.2, Java 2 SDK 英文文档

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Java^TM 2 Platform
Standard Edition

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javax.swing
Class DefaultFocusManager

java.lang.Object
  |
  +--javax.swing.FocusManager
        |
        +--javax.swing.DefaultFocusManager

public class DefaultFocusManager
extends FocusManager

Default swing focus manager implementation.

Fields inherited from class javax.swing.FocusManager

FOCUS_MANAGER_CLASS_PROPERTY

Constructor Summary

DefaultFocusManager()


Method Summary

boolean compareTabOrder(Component a, Component b)
          Return true if a should be before b in the "tab" order.

void focusNextComponent(Component aComponent)
          Cause the focus manager to set the focus on the next focusable component

void focusPreviousComponent(Component aComponent)
          Cause the focus manager to set the focus on the previous focusable component

Component getComponentAfter(Container aContainer, Component aComponent)
          Return the component the should receive the focus after aComponent

Component getComponentBefore(Container aContainer, Component aComponent)
          Return the component that should receive the focus before aComponent

Component getFirstComponent(Container aContainer)
          Return the first component that should receive the focus

Component getLastComponent(Container aContainer)
          Return the last component that should receive the focus

void processKeyEvent(Component focusedComponent, KeyEvent anEvent)
          This method is called by JComponents when a key event occurs.

Methods inherited from class javax.swing.FocusManager

disableSwingFocusManager, getCurrentManager, isFocusManagerEnabled, setCurrentManager

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

DefaultFocusManager

public DefaultFocusManager()

Method Detail

processKeyEvent

public void processKeyEvent(Component focusedComponent,
                            KeyEvent anEvent)

Description copied from class: FocusManager

This method is called by JComponents when a key event occurs. JComponent gives key events to the focus manager first, then to key listeners, then to the keyboard UI dispatcher. This method should look at the key event and change the focused component if the key event matches the receiver's focus manager hot keys. For example the default focus manager will change the focus if the key event matches TAB or Shift + TAB. The focus manager should call consume() on anEvent if anEvent has been processed. focusedComponent is the component that currently has the focus. Note: FocusManager will receive both KEY_PRESSED and KEY_RELEASED key events. If one event is consumed, the other one should be consumed too.

Overrides:: processKeyEvent in class FocusManager

focusNextComponent

public void focusNextComponent(Component aComponent)

Cause the focus manager to set the focus on the next focusable component

Overrides:: focusNextComponent in class FocusManager

focusPreviousComponent

public void focusPreviousComponent(Component aComponent)

Cause the focus manager to set the focus on the previous focusable component

Overrides:: focusPreviousComponent in class FocusManager

getFirstComponent

public Component getFirstComponent(Container aContainer)

Return the first component that should receive the focus

getLastComponent

public Component getLastComponent(Container aContainer)

Return the last component that should receive the focus

getComponentBefore

public Component getComponentBefore(Container aContainer,
                                    Component aComponent)

Return the component that should receive the focus before aComponent

getComponentAfter

public Component getComponentAfter(Container aContainer,
                                   Component aComponent)

Return the component the should receive the focus after aComponent

compareTabOrder

public boolean compareTabOrder(Component a,
                               Component b)

Return true if a should be before b in the "tab" order. Override this method if you want to change the automatic "tab" order. The default implementation will order tab to give a left to right, top down order. Override this method if another order is required.