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<h2 title="Class FocusArrowListener" class="title">Class FocusArrowListener</h2>
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<li><a href="/usr/share/doc/default-jdk-doc/api/java/awt/event/KeyAdapter.html?is-external=true" title="class or interface in java.awt.event">java.awt.event.KeyAdapter</a></li>
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<li>com.bric.plaf.FocusArrowListener</li>
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<dt>All Implemented Interfaces:</dt>
<dd><a href="/usr/share/doc/default-jdk-doc/api/java/awt/event/KeyListener.html?is-external=true" title="class or interface in java.awt.event">KeyListener</a>, <a href="/usr/share/doc/default-jdk-doc/api/java/util/EventListener.html?is-external=true" title="class or interface in java.util">EventListener</a></dd>
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<pre>public class <span class="typeNameLabel">FocusArrowListener</span>
extends <a href="/usr/share/doc/default-jdk-doc/api/java/awt/event/KeyAdapter.html?is-external=true" title="class or interface in java.awt.event">KeyAdapter</a></pre>
<div class="block">This listens for arrow keys and shifts
the keyboard focus accordingly.
So if you press the left arrow key, the component
to the left of the source component requests the focus.
<P>This scans for the first available component whose
<code>isFocusable()</code> method returns <code>true</code>.
If no such component is found: nothing happens.</div>
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<td class="colOne"><code><span class="memberNameLink"><a href="../../../com/bric/plaf/FocusArrowListener.html#FocusArrowListener--">FocusArrowListener</a></span>()</code> </td>
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<td class="colFirst"><code>static <a href="/usr/share/doc/default-jdk-doc/api/java/util/Set.html?is-external=true" title="class or interface in java.util">Set</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../com/bric/plaf/FocusArrowListener.html#getFocusableComponents-java.awt.Component-">getFocusableComponents</a></span>(<a href="/usr/share/doc/default-jdk-doc/api/java/awt/Component.html?is-external=true" title="class or interface in java.awt">Component</a> currentFocusOwner)</code>
<div class="block">Returns a set of all the components that
can have the keyboard focus.</div>
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<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../com/bric/plaf/FocusArrowListener.html#keyPressed-java.awt.event.KeyEvent-">keyPressed</a></span>(<a href="/usr/share/doc/default-jdk-doc/api/java/awt/event/KeyEvent.html?is-external=true" title="class or interface in java.awt.event">KeyEvent</a> e)</code> </td>
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<td class="colFirst"><code>static boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../com/bric/plaf/FocusArrowListener.html#shiftFocus-int-int-java.awt.Component-">shiftFocus</a></span>(int dx,
int dy,
<a href="/usr/share/doc/default-jdk-doc/api/java/awt/Component.html?is-external=true" title="class or interface in java.awt">Component</a> src)</code>
<div class="block">Shifts the focus in a certain direction.</div>
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<code><a href="/usr/share/doc/default-jdk-doc/api/java/awt/event/KeyAdapter.html?is-external=true#keyReleased-java.awt.event.KeyEvent-" title="class or interface in java.awt.event">keyReleased</a>, <a href="/usr/share/doc/default-jdk-doc/api/java/awt/event/KeyAdapter.html?is-external=true#keyTyped-java.awt.event.KeyEvent-" title="class or interface in java.awt.event">keyTyped</a></code></li>
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<h4>FocusArrowListener</h4>
<pre>public FocusArrowListener()</pre>
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<pre>public void keyPressed(<a href="/usr/share/doc/default-jdk-doc/api/java/awt/event/KeyEvent.html?is-external=true" title="class or interface in java.awt.event">KeyEvent</a> e)</pre>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="/usr/share/doc/default-jdk-doc/api/java/awt/event/KeyListener.html?is-external=true#keyPressed-java.awt.event.KeyEvent-" title="class or interface in java.awt.event">keyPressed</a></code> in interface <code><a href="/usr/share/doc/default-jdk-doc/api/java/awt/event/KeyListener.html?is-external=true" title="class or interface in java.awt.event">KeyListener</a></code></dd>
<dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
<dd><code><a href="/usr/share/doc/default-jdk-doc/api/java/awt/event/KeyAdapter.html?is-external=true#keyPressed-java.awt.event.KeyEvent-" title="class or interface in java.awt.event">keyPressed</a></code> in class <code><a href="/usr/share/doc/default-jdk-doc/api/java/awt/event/KeyAdapter.html?is-external=true" title="class or interface in java.awt.event">KeyAdapter</a></code></dd>
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<h4>shiftFocus</h4>
<pre>public static boolean shiftFocus(int dx,
int dy,
<a href="/usr/share/doc/default-jdk-doc/api/java/awt/Component.html?is-external=true" title="class or interface in java.awt">Component</a> src)</pre>
<div class="block">Shifts the focus in a certain direction.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>dx</code> - the amount to increment x.</dd>
<dd><code>dy</code> - the amount to increment y.</dd>
<dd><code>src</code> - the source to traverse from.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>true if another component requested the focus
as a result of this method. This may return false if
no suitable component was found to shift focus to.
(If you press the right arrow key on the right-most
component, for example.)</dd>
</dl>
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<h4>getFocusableComponents</h4>
<pre>public static <a href="/usr/share/doc/default-jdk-doc/api/java/util/Set.html?is-external=true" title="class or interface in java.util">Set</a> getFocusableComponents(<a href="/usr/share/doc/default-jdk-doc/api/java/awt/Component.html?is-external=true" title="class or interface in java.awt">Component</a> currentFocusOwner)</pre>
<div class="block">Returns a set of all the components that
can have the keyboard focus.
<P>My first implementation involved of this concept
simply involved asking JCompnonents if they were
focusable, but in the <code>FilledButtonTest</code> this
resulted in shifting focus to the ContentPane. Although
it is technically focusable: if I used the tab key
I did <i>not</i> get this result. So I studied
the inner workings for Component.transferFocus()
and ended up with a method that involved
calls to <code>getFocusCycleRootAncestor()</code>,
and <code>getFocusTraversalPolicy()</code>.
<P>(Also credit goes to Werner for originally tipping me off
towards looking at FocusTraversalPolicies.)</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>currentFocusOwner</code> - the current focus owner.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>all the JComponents that can receive the focus.</dd>
</dl>
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