focus_findnextfocus.html
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<TITLE>Finding the Next Focusable Component
(Java Developers Almanac Example)
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<META CONTENT="Patrick Chan" NAME="AUTHOR">
<META CONTENT="Code Examples from The Java Developers Almanac 1.4" NAME="DESCRIPTION">
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<B><A HREF="../java.awt/pkg.html#Focus">Focus</A></B><font color="#666666" SIZE="-2">
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<h3>
e619.
Finding the Next Focusable Component</h3>
<pre>
public 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;
}
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Related Examples
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e610. <a class="eglink" href="focus_FindFocus.html?l=rel">
Determining Which Component or Window Has the Focus
</a>
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e611. <a class="eglink" href="focus_NoFocus.html?l=rel">
Preventing a Component from Gaining the Focus
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e612. <a class="eglink" href="focus_NoFocusWindow.html?l=rel">
Preventing a Window from Gaining the Focus
</a>
<br>
e613. <a class="eglink" href="focus_FocusEvents.html?l=rel">
Listening to All Focus Changes Between Components in an Application
</a>
<br>
e614. <a class="eglink" href="focus_FocusTravKeyComp.html?l=rel">
Setting Focus Traversal Keys in a Component
</a>
<br>
e615. <a class="eglink" href="focus_FocusTravKey.html?l=rel">
Setting Focus Traversal Keys for the Entire Application
</a>
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e616. <a class="eglink" href="focus_FocusTrans.html?l=rel">
Moving the Focus to the Next or Previous Focusable Component
</a>
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e617. <a class="eglink" href="focus_NextFocus.html?l=rel">
Modifying the Focus Traversal Order
</a>
<br>
e618. <a class="eglink" href="focus_InitialFocus.html?l=rel">
Setting the Initial Focused Component in a Window
</a>
<br>
e620. <a class="eglink" href="focus_TempFocus.html?l=rel">
Determining If a Focus Lost Is Temporary or Permanent
</a>
<br>
e621. <a class="eglink" href="focus_OppositeFocus.html?l=rel">
Determining the Opposite Component of a Focus Event
</a>
<br>
e622. <a class="eglink" href="focus_ValidateFocus.html?l=rel">
Validating a JTextField When Permanently Losing the Focus
</a>
<br>
e623. <a class="eglink" href="focus_RemoveFocus.html?l=rel">
Removing the Focus from the Application
</a>
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e624. <a class="eglink" href="focus_WindowFocus.html?l=rel">
Activating a Keystroke When Any Component in the Window Has Focus
</a>
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e625. <a class="eglink" href="focus_ChildFocus.html?l=rel">
Activating a Keystroke When Any Child Component Has Focus
</a>
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See also:
<a class="eglink" href="/egs/java.awt/pkg.html?l=rel#Colors">
Colors
</a>
<a class="eglink" href="/egs/java.awt/pkg.html?l=rel#Components">
Components
</a>
<a class="eglink" href="/egs/java.awt/pkg.html?l=rel#Containers">
Containers
</a>
<a class="eglink" href="/egs/java.awt/pkg.html?l=rel#Cursors">
Cursors
</a>
<a class="eglink" href="/egs/java.awt/pkg.html?l=rel#Drawing">
Drawing
</a>
<a class="eglink" href="/egs/java.awt/pkg.html?l=rel#Events">
Events
</a>
<a class="eglink" href="/egs/java.awt/pkg.html?l=rel#Frames">
Frames
</a>
<a class="eglink" href="/egs/java.awt/pkg.html?l=rel#GridBagLayout">
GridBagLayout
</a>
<a class="eglink" href="/egs/java.awt/pkg.html?l=rel#Images">
Images
</a>
<a class="eglink" href="/egs/java.awt/pkg.html?l=rel#Shapes">
Shapes
</a>
<a class="eglink" href="/egs/java.awt/pkg.html?l=rel#Simulating%20Events">
Simulating Events
</a>
<a class="eglink" href="/egs/java.awt/pkg.html?l=rel#Text">
Text
</a>
<a class="eglink" href="/egs/java.awt/pkg.html?l=rel#The%20Screen">
The Screen
</a>
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