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FocusArrowListener
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com.bric.plaf</FONT>
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Class FocusArrowListener</H2>
<PRE>
<A HREF="/usr/share/doc/default-jdk-doc/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">java.lang.Object</A>
<IMG SRC="../../../resources/inherit.gif" ALT="extended by "><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>
<IMG SRC="../../../resources/inherit.gif" ALT="extended by "><B>com.bric.plaf.FocusArrowListener</B>
</PRE>
<DL>
<DT><B>All Implemented Interfaces:</B> <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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<DT><PRE>public class <B>FocusArrowListener</B><DT>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></DL>
</PRE>
<P>
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.
<P>
<P>
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<TD><CODE><B><A HREF="../../../com/bric/plaf/FocusArrowListener.html#FocusArrowListener()">FocusArrowListener</A></B>()</CODE>
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<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></FONT></TD>
<TD><CODE><B><A HREF="../../../com/bric/plaf/FocusArrowListener.html#getFocusableComponents(java.awt.Component)">getFocusableComponents</A></B>(<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>
<BR>
Returns a set of all the components that
can have the keyboard focus.</TD>
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<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../com/bric/plaf/FocusArrowListener.html#keyPressed(java.awt.event.KeyEvent)">keyPressed</A></B>(<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>
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<CODE>static boolean</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../com/bric/plaf/FocusArrowListener.html#shiftFocus(int, int, java.awt.Component)">shiftFocus</A></B>(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>
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Shifts the focus in a certain direction.</TD>
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<TD><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></TD>
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<A NAME="FocusArrowListener()"><!-- --></A><H3>
FocusArrowListener</H3>
<PRE>
public <B>FocusArrowListener</B>()</PRE>
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<A NAME="keyPressed(java.awt.event.KeyEvent)"><!-- --></A><H3>
keyPressed</H3>
<PRE>
public void <B>keyPressed</B>(<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>
<DD><DL>
<DT><B>Specified by:</B><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><DT><B>Overrides:</B><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></DL>
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<HR>
<A NAME="shiftFocus(int, int, java.awt.Component)"><!-- --></A><H3>
shiftFocus</H3>
<PRE>
public static boolean <B>shiftFocus</B>(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>
<DL>
<DD>Shifts the focus in a certain direction.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>dx</CODE> - the amount to increment x.<DD><CODE>dy</CODE> - the amount to increment y.<DD><CODE>src</CODE> - the source to traverse from.
<DT><B>Returns:</B><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.)</DL>
</DD>
</DL>
<HR>
<A NAME="getFocusableComponents(java.awt.Component)"><!-- --></A><H3>
getFocusableComponents</H3>
<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> <B>getFocusableComponents</B>(<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>
<DL>
<DD>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.)
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>currentFocusOwner</CODE> - the current focus owner.
<DT><B>Returns:</B><DD>all the JComponents that can receive the focus.</DL>
</DD>
</DL>
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